Mitsubishi Electric EHSC-VM2B, EHSC-YM9B, EHSC-TM9B, EHSC-VM6EB, EHSC-YM9EB Service Manual
...
SERVICE MANUAL
HYDROBOX
No. OCH532
REVISED EDITION-A
CONTENTS
1. REFERENCE MANUAL
...................................
2
2. SAFETY PRECAUTION
...................................
3
3. SPECIFICATIONS
............................................
6
4. PART NAMES AND FUNCTIONS
..................
7
5. OUTLINES AND DIMENSIONS
......................
11
6. WIRING DIAGRAM
........................................
13
7. FIELD WIRING
...............................................
24
8. WATER SYSTEM DIAGRAM
.........................
28
9. CONTROLS
...................................................
31
10. TROUBLESHOOTING
...................................
51
11. DISASSEMBLY PROCEDURE
......................
68
12. SUPPLEMENTARY INFORMATION
.............
82
13. SERVICE AND MAINTENANCE
...................
83
January 2013
Note:
• This manual describes
only service data of
Hydrobox.
• RoHS compliant products have <G> mark on
the spec name plate.
R410A
MAIN CONTROLLER
PARTS CATALOG (OCB532)
HYDROBOX
• Please void OCH532.
Revision:
• EHSC-VM2B.UK
and EHSC-TM9B.UK
have been added in
REVISED EDITION-A.
• Some descriptions have
been modified.
[Model name]
EHSC-VM2B
EHSC-VM6B
EHSC-YM9B
EHSC-TM9B
EHSC-VM6EB
EHSC-YM9EB
EHPX-VM2B
EHPX-VM6B
EHPX-YM9B
ERSC-VM2B
[Service Ref.]
EHSC-VM2B.UK
EHSC-VM6B.UK
EHSC-YM9B.UK
EHSC-TM9B.UK
EHSC-VM6EB.UK
EHSC-YM9EB.UK
EHPX-VM2B.UK
EHPX-VM6B.UK
EHPX-YM9B.UK
ERSC-VM2B.UK
2
REFERENCE MANUAL
1
OUTDOOR UNIT'S SERVICE MANUAL
Service Ref. Service Manual No.
PUHZ-RP35/50/60/71VHA4
OCH451
PUHZ-RP35/50/60/71VHA4R4
PUHZ-RP100/125/140VKA
PUHZ-RP100/125/140YKA
PUHZ-RP100/125/140YKAR4
PUHZ-HRP71/100VHA
OCH425
PUHZ-HRP71/100VHA2
PUHZ-HRP71/100VHA2R1
PUHZ-HRP100VHA2R2
PUHZ-HRP100/125YHA
PUHZ-HRP100/125YHA2
PUHZ-HRP100/125YHA2R1
PUHZ-W50/85VHA(-BS)
OCH439PUHZ-W50/85VHAR1(-BS)
PUHZ-W50VHAR2(-BS)
PUHZ-W85VHA2.UK
OCH465
PUHZ-W85VHA2-BS.UK
PUHZ-HW112/140YHA(-BS)
OCH439
PUHZ-HW112/140YHA2(-BS)
PUHZ-HW112/140YHA2R1(-BS)
PUHZ-HW112/140YHA2R3(-BS)
PUHZ-HW140VHA(-BS)
PUHZ-HW140VHA2(-BS)
PUHZ-HW140VHA2R1(-BS)
PUHZ-HW140VHA2R2-BS
PUHZ-HW140VHA2R3(-BS)
PUHZ-SW40/45VHA(-BS) OCH525
PUHZ-SW75/100/120VHA(-BS)
OCH533
PUHZ-SW100/125YHA(-BS)
PUHZ-SHW80/112VHA
OCH526
PUHZ-SWH112/140YHA
OCH532A
3
SAFETY PRECAUTION
2
Please read the following safety precautions carefully.
WARNING:
Precautions that must be observed to prevent injuries or death.
CAUTION:
Precautions that must be observed to prevent damage to unit.
Mitsubishi Electric is not responsible for the failure of locally-supplied and fi eld-supplied parts.
Be sure to perform periodical maintenance.
Be sure to follow your local regulations.
Be sure to follow the instructions provided in this manual.
•
•
•
WARNING
Mechanical
The hydrobox and outdoor units must not be installed, disassembled, relocated, altered or repaired by the user. Ask an authoris ed installer or technician. If the
unit is installed improperly or modifi ed after installation by the user water leakage, electric shock or fi re may result.
The outdoor unit should be securely fi xed to a hard level surface capable of bearing its weight.
The hydrobox should be positioned on a hard vertical surface capable of supporting its fi lled weight to prevent excessive sound or vibration.
Do not position furniture or electrical appliances below the outdoor unit or hydrobox.
The discharge pipework from the emergency/safety devices of the hydrobox should be installed according to local law.
Only use accessories and replacement parts authorised by Mitsubishi Electric ask a qualifi ed technician to fi t the parts.
Electrical
All electrical work should be performed by a qualifi ed technician according to local regulations and the instructions given in this manual.
The units must be powered by a dedicated power supply and the correct voltage and circuit breakers must be used.
Wiring should be in accordance with national wiring regulations. Connections must be made securely and without tension on the terminals.
Earth unit correctly.
General
Keep children and pets away from both the hydrobox and outdoor units.
Do not use the hot water produced by the heat pump directly for drinking or cooking. This could cause illness to the user.
Do not stand on the units.
Do not touch switches with wet hands.
Annual maintenance checks on both the hydrobox and the outdoor unit should be done by qualifi ed person.
Do not place contains with liquids in on top of the hydrobox. If they leak or spill onto the hydrobox damage to the unit and/or fi re could occur.
Do not place any heavy items on top of the hydrobox.
When installing or relocating, or servicing the hydrobox, use only the specifi ed refrigerant (R410A) to charge the refrigerant lines. Do not mix it with any other
refrigerant and do not allow air to remain in the lines. If air is mixed with the refrigerant, then it can be the cause of abnormal high pressure in the refrigerant
line, and may result in an explosion and other hazards.
The use of any refrigerant other than that specifi ed for the system will cause mechanical failure or system malfunction or unit breakdown. In the worst case, this
could lead to a serious impediment to securing product safety.
In heating mode, to avoid the heat emitters being damaged by excessively hot water, set the target fl ow temperature to a minimum of 2ºC below the maximum
allowable temperature of all the heat emitters. For Zone2, set the target fl ow temperature to a minimum of 5ºC below the maximum allowable fl ow temperature
of all the heat emitters in Zone2 circuit.
CAUTION
Use clean water that meets local quality standards on the primary circuit.
The outdoor unit should be installed in an area with suffi cient airfl ow according to the diagrams in the outdoor unit installation manual.
The hydrobox should be located inside to minimise heat loss.
Water pipe-runs on the primary circuit between outdoor and indoor unit should be kept to a minimum to reduce heat loss.
Ensure condensate from outdoor unit is piped away from the base to avoid puddles of water.
Remove as much air as possible from water circuit.
Refrigerant leakage may cause suffocation. Provide ventilation in accordance with EN378-1.
Be sure to wrap insulation around the piping. Direct contact with the bare piping may result in burns or frostbite.
Never put batteries in your mouth for any reason to avoid accidental ingestion.
Battery ingestion may cause choking and/or poisoning.
Install the unit on a rigid structure to prevent excessive sound or vibration during operation.
If power to the hydrobox is to be turned off (or system switched off) for a long time, the water should be drained.
Preventative measures should be taken against water hammer, such as installing a Water Hammer Arrestor on the primary water circuit, as directed by the manu-
facturer.
In order to prevent condensation on emitters, adjust fl ow temperature appropriately and also set the lower limit of the fl ow temperature on site.
OCH532A
4
CAUTION (SPLIT MODELS ONLY)
<Using R410A refrigerant heat pumps>
Use C1220 copper phosphorus, for copper and copper alloy seamless pipes, to connect the refrigerant pipes. Make sure the insides of the pipes are clean and
do not contain any harmful contaminants such as sulfuric compounds, oxidants, debris, or dust. Use pipes with the specifi ed thickness. (Refer to 4.4 in the instal-
lation manual.) Note the following if reusing existing pipes that carried R22 refrigerant.
- Replace the existing fl are nuts and fl are the fl ared sections again.
- Do not use thin pipes. (Refer to 4.4
in the installation manual.
)
Store the pipes to be used during installation indoors and keep both ends of the pipes sealed until just before brazing. (Leave elbow joints, etc. in their packaging.) If dust, debris, or moisture enters the refrigerant lines, oil deterioration or compressor breakdown may result.
Use ester oil, ether oil, alkylbenzene oil (small amount) as the refrigeration oil applied to the fl ared sections. If mineral oil is mixed in the refrigeration oil, oil dete-
rioration may result.
Do not use refrigerant other than R410A refrigerant. If another refrigerant is used, the chlorine will cause the oil to deteriorate.
Use the following tools specifi cally designed for use with R410A refrigerant. The following tools are necessary to use R410A refrigerant. Contact your nearest
dealer for any questions.
Tools (for R410A)
Gauge manifold Flare tool
Charge hose Size adjustment gauge
Gas leak detector Vacuum pump adapter
Torque wrench Electronic refrigerant charging scale
Be sure to use the correct tools. If dust, debris, or moisture enters the refrigerant lines, refrigeration oil deterioration may result.
Do not use a charging cylinder, a cylindrical measuring container, when charging R410A refrigerant gas. If the refrigerant gas is transferred to a charging cylinder,
the composition of the refrigerant will change and system effi ciency will be reduced.
WARNING (SPLIT MODELS ONLY)
Do not discharge refrigerant into the atmosphere if refrigerant leaks during installation, ventilate the room.
Use appropriate tools for high pressure refrigerant.
When pumping down refrigerant , stop the compressor before disconnecting the refrigerant pipes.
During installation securely fasten the refrigerant pipes before starting the compressor.
Check that refrigerant gas does not leak after the completion of installation.
Use R410A refrigerant only. Do not allow air to enter the lines. Failure to observe these instructions will cause mechanical failure, system failure or, in the worst
case, serious breach of product safety.
OCH532A
Gravimeter
Unit
5
[1] Cautions for service
(1) Perform service after recovering the refrigerant left in unit completely.
(2) Do not release refrigerant in the air.
(3) After completing service, charge the cycle with specified amount of refrigerant.
(4) When performing service, install a filter drier simultaneously.
Be sure to use a filter drier for new refrigerant.
[2] Additional refrigerant charge
When charging directly from refrigerant cylinder
· Check that refrigerant cylinder for R410A on the market is syphon type.
· Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)
[3] Service tools
Use the service tools below as exclusive tools for R410A refrigerant.
No. Tool name Specifications
1
Gauge manifold
· Only for R410A
· Use the existing fitting
specifications
. (UNF1/2)
· Use high-tension side pressure of 5.3 MPa·G or over.
2
Charge hose
· Only for R410A
· Use pressure performance of 5.09 MPa·G or over.
3
Electronic scale
—
4
Gas leak detector · Use the detector for R134a, R407C or R410A
5
Adaptor for reverse flow check · Attach on vacuum pump.
6
Refrigerant charge base
—
7
Refrigerant cylinder
· Only for R410A ·Top of cylinder (Pink)
· Cylinder with syphon
8
Refrigerant recovery equipment
—
OCH532A
6
SPECIFICATIONS
3
*1 The environment must be frost-free.
*2 Low ambient cooling is NOT allowed.
Model name EHSC-VM2B EHSC-VM6B EHSC-YM9B EHSC-TM9B EHSC-VM6EB EHSC-YM9EB EHPX-VM2B EHPX-VM6B EHPX-YM9B ERSC-VM2B
Overall unit dimensions (Height×Width×Depth) 800×530×360 mm
860×530×360 mm
Weight (empty) 51 kg 53 kg 53 kg 53 kg 49 kg 49 kg 39 kg 41 kg 41 kg 54 kg
Weight (full) 57 kg 59 kg 59 kg 59 kg 55 kg 55 kg 44 kg 46 kg 46 kg 60 kg
Plate heat exchanger
———
Cooling mode NOT available Available
Unvented expansion vessel
(Primary circuit)
Nominal volume 10 L - 10 L
Charge pressure 0.1 MPa (1 bar) - 0.1 MPa (1 bar)
Safety
device
Water circuit
(Primary)
Control thermistor 1 - 80°C
Pressure relief valve 0.3 MPa (3 bar)
Flow switch Min fl ow 5.5 L/min
Booster heater
Manual reset thermostat 90°C
Thermal cut-out (for dry run prevention) 121°C
Primary circuit circulating pump Grundfos UPM2 25 70-180
Connections
Water 28 mm compression (Primary circuit) G1 (Male)
Refrigerant
(R410A)
Liquid 9.52 mm — 9.52 mm
Gas 15.88 mm — 15.88 mm
Target temperature range
Flow temperature
Heating 25 - 60°C
Cooling — 5 - 25°C
Room temperature
Heating 10 - 30°C
Cooling — Not available
Guaranteed operating
range
Ambient *1 0 - 35°C (≤ 80%RH)
Outdoor temperature
Heating See outdoor unit spec table.
Cooling —
See outdoor
unit spec table
(min. 10°C). *2
Electrical data
Control board
Power supply
(Phase, voltage,
frequency)
~/N, 230 V, 50 Hz
Breaker
(*when powered from
independent source)
10 A
Booster heater
Power supply
(Phase, voltage,
frequency)
~/N, 230 V,
50 Hz
~/N, 230 V,
50 Hz
3~, 400 V,
50 Hz
3~, 230 V,
50 Hz
~/N, 230 V,
50 Hz
3~, 400 V,
50 Hz
~/N, 230 V,
50 Hz
~/N, 230 V,
50 Hz
3~, 400 V,
50 Hz
~/N, 230 V,
50 Hz
Capacity 2 kW 2 kW + 4 kW 3 kW + 6 kW 3 kW + 6 kW 2 kW + 4 kW 3 kW + 6 kW 2 kW 2 kW + 4 kW 3 kW + 6 kW 2 kW
Current 9 A 26 A 13 A 23 A 26 A 13 A 9 A 26 A 13 A 9 A
Breaker 16 A 32 A 16 A 32 A 32 A 16 A 16 A 32 A 16 A 16 A
<Table 3.1>
Optional extras
• Wireless Remote Controller PAR-WT50R-E • Joint pipe (15.88 → 12.7) PAC-SH50RJ-E
• Wireless Receiver PAR-WR51R-E • Joint pipe (9.52 → 6.35) PAC-SH30RJ-E
• Remote sensor PAC-SE51TS-E • Thermistor PAC-TH011-E
• Tank thermistor (THW5) PAC-TH011TK-E • High temperature thermistor PAC-TH011HT-E
OCH532A
7
PART NAMES AND FUNCTIONS
4
Figure 4-1
Figure 4-2
4
Number Component
1 Control and electrical box
2 Main controller
3 Manometer
4 Expansion vessel
5 Expansion vessel charge valve
6 Automatic air vent
7 Booster heater
8 Drain cock
9 Water circulation pump
10 Pressure relief valve
11 Flow switch
12 Plate heat exchanger
13 Strainer valve
A
Inlet from space heating/Indirect DHW tank (primary return)
B
Outlet to space heating/Indirect DHW tank
(primary fl ow)
C Refrigerant (Liquid)
D Refrigerant (Gas)
E
Discharge from pressure relief valve (installer to
pipe connect to suitable drain point)
1
2
3
6
5
7
8
9
11
10
12
13
E
<EHSC-*M*B> (Split model system)
ABCD
OCH532A
8
Figure 4-3
Figure 4-4
Number Component
1 Control and electrical box
2 Main controller
3 Manometer
6 Automatic air vent
7 Booster heater
8 Drain cock
9 Water circulation pump
10 Pressure relief valve
11 Flow switch
12 Plate heat exchanger
13 Strainer valve
A
Inlet from space heating/Indirect DHW tank (primary return)
B
Outlet to space heating/Indirect DHW tank
(primary fl ow)
C Refrigerant (Liquid)
D Refrigerant (Gas)
E
Discharge from pressure relief valve (installer to
pipe connect to suitable drain point)
6
7
8
9
11
10
E
<EHSC-*M*EB> (Split model system without expansion vessel)
*For installation of this model, make sure to install a primary-side expansion vessel in the fi eld. (Refer to installation manual, Figure 4.3.3.)
1
2
3
ABCD
13
12
OCH532A
9
Number Component
1 Control and electrical box
2 Main controller
3 Manometer
4 Expansion vessel
5 Expansion vessel charge valve
6
Automatic air vent
7 Booster heater
8 Drain cock
9 Water circulation pump
10 Pressure relief valve
11 Flow switch
13 Strainer valve
A
Inlet from space heating/Indirect DHW tank (pri-
mary return)
B Inlet from heat pump
C Outlet to heat pump
D
Outlet to space heating/Indirect DHW tank (primary
fl ow)
E
Discharge from pressure relief valve (installer to
pipe connect to suitable drain point)
1
2
3
<EHPX> (Packaged model system)
4
7
8
9
10
11
13
E
6
5
ABCD
Figure 4-5
Figure 4-6
OCH532A
10
Number Component
1 Control and electrical box
2 Main controller
3 Manometer
4 Expansion vessel
5 Expansion vessel charge valve
6 Automatic air vent
7 Booster heater
8 Drain cock
9 Water circulation pump
10 Pressure relief valve
11 Flow switch
12 Plate heat exchanger
13 Strainer valve
14 Drain pan
A
Inlet from space heating/Indirect DHW tank (primary return)
B
Outlet to space heating/Indirect DHW tank
(primary fl ow)
C Refrigerant (Liquid)
D Refrigerant (Gas)
E
Discharge from pressure relief valve (installer to
pipe connect to suitable drain point)
1
2
3
<ERSC> (Split model system for heating and cooling)
4
6
5
7
8
9
11
10
12
13
E
14
AB CD
Figure 4-7
Figure 4-8
OCH532A
11
OUTLINES AND DIMENSIONS
5
5-1. Technical Drawings
(Unit: mm)
357
348
233
461
381
326
227
163
124
86
48
282
253
189
137
96
55.5
㧔233)
100.5
110. 5
800
264.5
590
530
357
348
233
282
253
189
137
77
56
461
227
163
157
124
89
86
48
55.5
㧔233)
800
264.5
577
110.5
530
F
A
B
C
D
E
<EHSC> (Split model system)
<Front>
<Side> <Rear>
<View from below>
Letter Pipe description Connection size/type
A
Space heating/Indirect DHW
tank (primary) return connection
28 mm/Compression
B Flow connection from heat pump 28 mm/Compression
C Return connection to heat pump 28 mm/Compression
D
Space heating/Indirect DHW
tank (primary) fl ow connection
28 mm/Compression
E
Discharge pipe (by installer)
from pressure relief valve
G1/2” female (valve port within hydrobox casing)
F
Electrical cable inlets
—
For inlets and , run low-voltage wires including
external input wires and thermistor wires. For inlets
and , run high-voltage wires including power
cable, indoor-outdoor cable, and external output
wires.
*For a wireless receiver (option) cable, use inlet .
F
A
B
C
D
E
<EHPX> (Packaged model system)
<Front>
<Side> <Rear>
<View from below>
Earth leakage
circuit breaker
Terminal block
Main controller
Pressure relief
valve
Earth leakage
circuit breaker
Terminal block
Main controller
Pressure relief
valve
Automatic air vent
Automatic air vent
Letter Pipe description Connection size/type
A
Space heating/Indirect DHW
tank (primary) return connection
28 mm/Compression
B
Space heating/Indirect DHW
tank (primary) fl ow connection
28 mm/Compression
C Refrigerant (Liquid) 9.52 mm/Flare
D Refrigerant (Gas) 15.88 mm/Flare
E
Discharge pipe (by installer) from
pressure relief valve
G1/2” female (valve port within hydrobox casing)
F
Electrical cable inlets
—
For inlets and , run low-voltage wires including
external input wires and thermistor wires. For inlets
and , run high-voltage wires including power
cable, indoor-outdoor cable, and external output
wires.
*For a wireless receiver (option) cable, use inlet .
OCH532A
a
b
b
d
c
12
Service access
(233)
110
357
348
233
48
133
223
308
365
461
84
124
530
324.5
100.5
860
637
Letter Pipe description Connection size/type
A
Space heating and cooling/
Indirect DHW tank (primary)
return connection
G1 nut
B
Space heating and cooling/
Indirect DHW tank (primary) fl ow
connection
G1 nut
C Refrigerant (Liquid) 9.52 mm/Flare
D Refrigerant (Gas) 15.88 mm/Flare
E
Discharge pipe (by installer) from
pressure relief valve
G1/2” female (valve port within hydrobox casing)
F
Electrical cable inlets
—
For inlets and , run low-voltage wires including
external input wires and thermistor wires. For inlets
and , run high-voltage wires including power
cable, indoor-outdoor cable, and external output
wires.
*For a wireless receiver (option) cable, use inlet .
G Drain socket
O.D. ø20
A
B
C
D
E
<ERSC> (Split model system)
<Front>
<Right side>
<Rear>
<View from below>
Earth leakage
circuit breaker
Terminal block
Main controller
Pressure relief
valve
G
Automatic air vent
F
5-2. Service access diagrams
Service access
Parameter Dimension (mm)
a 200
b 150
c 500
d 500
Suffi cient space MUST be left for the provision of discharge pipework as detailed
in National and Local building regulations.
The hydrobox must be located indoors and in a frost-free environment, for
example in a utility room.
OCH532A
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
2
3
4
5
6
7
8
9
10
11
12
13
14
2
22
ECB1
L
(1)N(3)
BHCP
BLU
BLU
RED
WHT/No.2
WHT/No.1
RED
VLT
VLT
GRY
GRY
BHC1
BHT
642
531
A1
A2
BH1
BHF
2
4
Power supply
to Booster heater
~/N 230V 50Hz
2
2
1
3
5
7
X1
X2
X3
X4
X5A
X12
X11
X6
X8
X7
TBO.2
5
3
1
F1
F2
CN01
(BLK)
Signal
output
(Error)
Signal
output
(Defrost)
Signal
output
(Booster
heater2+)
MXV
M
1
~
M
1
~
MP2
M
1
~
MP3
MP1
M
1
~
2WV2
M
1
~
1
3
CNP1
(WHT)
1
3
1
3
Signal
output
(Boiler)
1
3
CNPWM
(WHT)
CNIH
(ORN)
2
1
3
CNBHT(BLK)
X5B
X10
CNBC
(GRY)
CNBH
(WHT)
TBO.1
X9
X13
642
531
A1
A2
Open
Close
N
3
Signal
output
(Immersion
heater)
*
1
91011
3WV
M
1
~
*
1
TBO.1
91011
2WV1
M
1
~
TBO.1
3WV 2WV1
NL
S3S2S1
NL
S3S2S1
Figure 1
To outdoor
unit
TB1
ORN
ORN
YLW
BLK
BLK
YLW
GRN/YLW
To outdoor
unit
Power supply
~/N 230V 50Hz
TB1
ORN
BLU
RED
BLU
RED
YLW
GRN/YLW
1
3
CN3C
(BLU)
5
3
1
1
3
5
3
1
CN01
(BLK)
ORN
BRN
CN3C
(BLU)
CN01
(BLK)
ORN
ORN
BRN
YLW
Cylinder unit powered
by independent source.
Cylinder unit powered
via outdoor unit
CIRCUIT
BREAKER
TBO.1
3
9
5
1
7
2
8
4
6
11
10
12
13
14
TBO.2
FTC4
3
9
5
1
7
2
8
4
6
11
10
12
13
14
TBI.1
12610148
13711945321
TBI.2
12610 148
13
7
11
9
4
5
321
13
CNP1(WHT)
1
5
CNV1
(WHT)
1
3
CN3C
(BLU)
5
3
1
CN01
(BLK)
18
SW3
18
SW1
LED1
LED3
118
6
SW2
SW4
TBI.1
1310 12 14117465932 81
TBI.2
1310121411
7
46
59
3
2
81
1
2
CN20
(RED)
TH1
1
3
CN21
(YLW)
TH2
1
4
THW1
1
2
1
3
IN2
IN7
IN6
IN5
IN4
IN3
IN1
t°t
°
THWB2
THWB1
THW8
t
°
THW6
t
°
THW7
t
°
THW9
t
°
Main
controller
1 2
THW2
THW5
CNW5
(WHT)
CNW12
(RED)
t°t°t°t°t
°
1
3
1
4
CN2F
(YLW)
CN20
(RED)
CN21
(YLW)
CNW12
(RED)
CNW5
(WHT)
1
2
1
2
CN108
1
3
13
13
CNBH
(WHT)
CNBHT
(BLK)
13
CNIH
(ORN)
CNBC
(GRY)
1
7
LED4
LED2
1
2
CN22
(BLU)
CNPWM
(WHT)
1
3
5
1
Wireless receiver
(Option)
CNRF
(WHT)
5
1
CN105
(RED)
CN2F
(YLW)
CN22
(BLU)
Table 1 Signal Inputs
Name
Terminal block Connector
Item OFF (Open) ON (Short)
IN1 TBI.1 1-2
— Room thermostat 1 input
Refer to SW2-1 in <6-11 Dip switch setting>
IN2 TBI.1 3-4 CN2F
Flow switch 1 input
Refer to SW2-2 in <6-11 Dip switch setting>
IN3 TBI.1 5-6
— Flow switch 2 input (Zone1)
Refer to SW3-2 in <6-11 Dip switch setting>
IN4 TBI.1 7-8
— Demand control input
Normal
Heat source OFF/Boiler operation *2
IN5 TBI.1 9-10
— Outdoor thermostat input *1
Standard operation
Heater operation/Boiler operation *2
IN6 TBI.1 11-12
— Room thermostat 2 input
Refer to SW3-1 in <6-11 Dip switch setting>
IN7 TBI.1 13-14
— Flow switch 3 input (Zone2)
Refer to SW3-3 in <6-11 Dip switch setting>
*1. If using outdoor thermostat for controlling operation of heaters, the lifetime of the heaters and
related parts may be reduced.
*2. To turn on the boiler operation, use the main controller to select “Boiler” in “External/input setting“
screen in the service menu.
Table 2 Outputs
Name
Terminal block Connector
Item OFF ON
OUT1
TBO.1 3-4
CNP1
Water circulation pump 1 output (Space heating & DHW) OFF ON
OUT2
TBO.1 5-6
—
Water circulation pump 2 output (Space heating for Zone1) OFF ON
OUT3
TBO.1 7-8
—
Water circulation pump 3 output (Space heating for Zone2) OFF ON
OUT4
TBO.1 9-11
CNV1
3-way valve (2-way valve1) output Heating DHW
OUT5
TBO.1 12-13
—
Mixing valve output
Stop Close
TBO.1 13-14 Stop Open
OUT6
—
CNBH 1-3
Booster heater 1 output OFF ON
OUT7
—
CNBH 5-7
Booster heater 2 output OFF ON
OUT8
TBO.2 11-12
—
Booster heater 2+ output OFF ON
OUT9
TBO.2 9-10
CNIH
Immersion heater output OFF ON
OUT10
TBO.1 1-2
—
Boiler output OFF ON
OUT11
TBO.2 1-2
—
Error output Normal Error
OUT12
TBO.2 3-4
—
Defrost output Normal Defrost
OUT13
TBO.2 7-8
—
2-way valve 2 output DHW Heating
Symbol Name Symbol Name
TB1
Terminal block <Power supply, Outdoor unit>
TH1 Thermistor (Room temp.)(Option)
ECB1
Earth leakage circuit breaker for booster heater
TH2 Thermistor (Ref. liquid temp.)
MP1
Water circulation pump1(Space heating & DHW)
THW1 Thermistor (Flow water temp.)
MP2 Water circulation pump2
(Space heating for Zone1)(Field supply)
THW2 Thermistor (Return water temp.)
THW5 Thermistor (DHW tank water temp.)(Option)
MP3 Water circulation pump3
(Space heating for Zone2)(Field supply)
THW6 Thermistor (Zone1 flow temp.)(Option)
THW7 Thermistor (Zone1 return temp.)(Option)
3WV(2WV1)
3-way valve (2-way valve1)(Field supply) THW8 Thermistor (Zone2 flow temp.)(Option)
2WV2 2-way valve2 (Field supply) THW9 Thermistor (Zone2 return temp.)(Option)
MXV Mixing valve (Field supply)
THWB1
Thermistor (Boiler flow temp.)(Option)
BHT Thermostat for booster heater
THWB2
Thermistor (Boiler return temp.)(Option)
BHF Thermal fuse for booster heater IN1 Room thermostat 1 (Field supply)
BH1 Booster heater 1 IN2 Flow switch 1
BHC1 Contactor for booster heater 1 IN3 Flow switch 2 (Field supply)
BHCP Contactor for booster heater protection IN4 Demand control (Field supply)
IN5 Outdoor thermostat (Field supply)
IN6 Room thermostat 2 (Field supply)
IN7 Flow switch 3 (Field supply)
FLOW TEMP. CONTROLLER (FTC4)
TBO.1~2
Terminal block <Outputs>
TBI.1~2
Terminal block <Signal Inputs,Thermistor>
F1~F2
Fuse (T6.3AL250V)
SW1~4
Dip switch *See 6-11 Dip switch setting
X1~X13
Relay
LED1 Power supply (FTC4)
LED2 Power supply (Main controller)
LED3 Communication (FTC4-Outdoor unit)
LED4 Reading or writing data to SD card
CNPWM
Pump speed control signal for MP1
CN108
SD card connector
1. Symbols used in wiring diagram are,
: connector, : terminal block.
2. Indoor unit and outdoor unit connecting wires
have polarities, make sure to match terminal numbers (S1, S2, S3) for correct wirings,
3. Since the outdoor unit side electric wiring may change, be sure to check the outdoor unit
electric wiring diagram for servicing.
4. This diagram shows the wiring of indoor unit and outdoor unit connecting wires
(specification of 230V), adopting superimposed system of power and signal.
When work to supply power separately to indoor unit and outdoor unit was applied, refer
to Figure 1.
13
6 WIRING DIAGRAM
6-1. EHSC-VM2B
OCH532A
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
2
3
4
5
6
7
8
9
10
11
12
13
14
2
222
ECB1
L
(1)N(3)
BHCP
BLU
BLU
BLU
REDRED
BLU/No.3
WHT/No.2
WHT/No.1
BLU/No.4
RED
VLT
VLT
PNK
PNK
GRY
GRY
BHC2
BHC1
BHT
642
531
A1
A2
642
531
A1
A2
BH1
BHF
BH2
2
4
Power supply
to Booster heater
~/N 230V 50Hz
2
2
2
1
3
5
7
X1
X2
X3
X4
X5A
X12
X11
X6
X8
X7
TBO.2
5
3
1
F1
F2
CN01
(BLK)
Signal
output
(Error)
Signal
output
(Defrost)
Signal
output
(Booster
heater2+)
MXV
M
1
~
M
1
~
MP2
M
1
~
MP3
MP1
M
1
~
2WV2
M
1
~
1
3
CNP1
(WHT)
1
3
1
3
Signal
output
(Boiler)
1
3
CNPWM
(WHT)
CNIH
(ORN)
2
1
3
CNBHT(BLK)
X5B
X10
CNBC
(GRY)
CNBH
(WHT)
TBO.1
X9
X13
642
531
A1
A2
Open
Close
N
3
Signal
output
(Immersion
heater)
*
1
91011
3WV
M
1
~
*
1
TBO.1
91011
2WV1
M
1
~
TBO.1
3WV 2WV1
Table 1 Signal Inputs
Name
Terminal block Connector
Item OFF (Open) ON (Short)
IN1 TBI.1 1-2
— Room thermostat 1 input
Refer to SW2-1 in <6-11 Dip switch setting>
IN2 TBI.1 3-4 CN2F
Flow switch 1 input
Refer to SW2-2 in <6-11 Dip switch setting>
IN3 TBI.1 5-6
— Flow switch 2 input (Zone1)
Refer to SW3-2 in <6-11 Dip switch setting>
IN4 TBI.1 7-8
— Demand control input
Normal
Heat source OFF/Boiler operation *2
IN5 TBI.1 9-10
— Outdoor thermostat input *1
Standard operation
Heater operation/Boiler operation *2
IN6 TBI.1 11-12
— Room thermostat 2 input
Refer to SW3-1 in <6-11 Dip switch setting>
IN7 TBI.1 13-14
— Flow switch 3 input (Zone2)
Refer to SW3-3 in <6-11 Dip switch setting>
*1. If using outdoor thermostat for controlling operation of heaters, the lifetime of the heaters and
related parts may be reduced.
*2. To turn on the boiler operation, use the main controller to select “Boiler” in “External/input setting“
screen in the service menu.
Symbol Name Symbol Name
TB1
Terminal block <Power supply, Outdoor unit>
TH1 Thermistor (Room temp.)(Option)
ECB1
Earth leakage circuit breaker for booster heater
TH2 Thermistor (Ref. liquid temp.)
MP1
Water circulation pump1(Space heating & DHW)
THW1 Thermistor (Flow water temp.)
MP2 Water circulation pump2
(Space heating for Zone1)(Field supply)
THW2 Thermistor (Return water temp.)
THW5 Thermistor (DHW tank water temp.)(Option)
MP3 Water circulation pump3
(Space heating for Zone2)(Field supply)
THW6 Thermistor (Zone1 flow temp.)(Option)
THW7 Thermistor (Zone1 return temp.)(Option)
3WV(2WV1)
3-way valve (2-way valve1)(Field supply) THW8 Thermistor (Zone2 flow temp.)(Option)
2WV2 2-way valve2 (Field supply) THW9 Thermistor (Zone2 return temp.)(Option)
MXV Mixing valve (Field supply)
THWB1
Thermistor (Boiler flow temp.)(Option)
BHT Thermostat for booster heater
THWB2
Thermistor (Boiler return temp.)(Option)
BHF Thermal fuse for booster heater IN1 Room thermostat 1 (Field supply)
BH1 Booster heater 1 IN2 Flow switch 1
BH2 Booster heater 2 IN3 Flow switch 2 (Field supply)
BHC1 Contactor for booster heater 1 IN4 Demand control (Field supply)
BHC2 Contactor for booster heater 2 IN5 Outdoor thermostat (Field supply)
BHCP Contactor for booster heater protection IN6 Room thermostat 2 (Field supply)
IN7 Flow switch 3 (Field supply)
FLOW TEMP. CONTROLLER (FTC4)
TBO.1~2
Terminal block <Outputs>
TBI.1~2
Terminal block <Signal Inputs,Thermistor>
F1~F2
Fuse (T6.3AL250V)
SW1~4
Dip switch *See 6-11 Dip switch setting
X1~X12
Relay
LED1 Power supply (FTC4)
LED2 Power supply (Main controller)
LED3 Communication (FTC4-Outdoor unit)
LED4 Reading or writing data to SD card
CNPWM
Pump speed control signal for MP1
CN108
SD card connector
NL
S3S2S1
NL
S3S2S1
Figure 1
To outdoor
unit
TB1
ORN
ORN
YLW
BLK
BLK
YLW
GRN/YLW
To outdoor
unit
Power supply
~/N 230V 50Hz
TB1
ORN
BLU
RED
BLU
RED
YLW
GRN/YLW
1
3
CN3C
(BLU)
5
3
1
1
3
5
3
1
CN01
(BLK)
ORN
BRN
CN3C
(BLU)
CN01
(BLK)
ORN
ORN
BRN
YLW
Cylinder unit powered
by independent source.
Cylinder unit powered
via outdoor unit
CIRCUIT
BREAKER
TBO.1
3
9
5
1
7
2
8
4
6
11
10
12
13
14
TBO.2
FTC4
3
9
5
1
7
2
8
4
6
11
10
12
13
14
TBI.1
12610148
13711945321
TBI.2
12610 148
13
7119
4
5
321
13
CNP1(WHT)
1
5
CNV1
(WHT)
1
3
CN3C
(BLU)
5
3
1
CN01
(BLK)
18
SW3
18
SW1
LED1
LED3
118
6
SW2
SW4
TBI.1
1310 12 14117465932 81
TBI.2
1310 12 1411746593281
1
2
CN20
(RED)
TH1
1
3
CN21
(YLW)
TH2
1
4
THW1
1
2
1
3
IN2
IN7
IN6
IN5
IN4
IN3
IN1
t°t
°
THWB2
THWB1
THW8
t
°
THW6
t
°
THW7
t
°
THW9
t
°
Main
controller
1
2
THW2
THW5
CNW5
(WHT)
CNW12
(RED)
t°t°t°t°t
°
1
3
1
4
CN2F
(YLW)
CN20
(RED)
CN21
(YLW)
CNW12
(RED)
CNW5
(WHT)
1
2
1
2
CN108
1
3
13
13
CNBH
(WHT)
CNBHT
(BLK)
13
CNIH
(ORN)
CNBC
(GRY)
1
7
LED4
LED2
1
2
CN22
(BLU)
CNPWM
(WHT)
1
3
5
1
Wireless receiver
(Option)
CNRF
(WHT)
5
1
CN105
(RED)
CN2F
(YLW)
CN22
(BLU)
Table 2 Outputs
Name
Terminal block Connector
Item OFF ON
OUT1
TBO.1 3-4
CNP1
Water circulation pump 1 output (Space heating & DHW) OFF ON
OUT2
TBO.1 5-6
—
Water circulation pump 2 output (Space heating for Zone1) OFF ON
OUT3
TBO.1 7-8
—
Water circulation pump 3 output (Space heating for Zone2) OFF ON
OUT4
TBO.1 9-11
CNV1
3-way valve (2-way valve1) output Heating DHW
OUT5
TBO.1 12-13
—
Mixing valve output
Stop Close
TBO.1 13-14 Stop Open
OUT6
—
CNBH 1-3
Booster heater 1 output OFF ON
OUT7
—
CNBH 5-7
Booster heater 2 output OFF ON
OUT8
TBO.2 11-12
—
Booster heater 2+ output OFF ON
OUT9
TBO.2 9-10
CNIH
Immersion heater output OFF ON
OUT10
TBO.1 1-2
—
Boiler output OFF ON
OUT11
TBO.2 1-2
—
Error output Normal Error
OUT12
TBO.2 3-4
—
Defrost output Normal Defrost
OUT13
TBO.2 7-8
—
2-way valve 2 output DHW Heating
1. Symbols used in wiring diagram are,
: connector, : terminal block.
2. Indoor unit and outdoor unit connecting wires
have polarities, make sure to match terminal numbers
(S1, S2, S3) for correct wirings,
3. Since the outdoor unit side electric wiring may change,
be sure to check the outdoor unit electric wiring
diagram for servicing.
4. This diagram shows the wiring of indoor unit and
outdoor unit connecting wires (specification of 230V),
adopting superimposed system of power and signal.
When work to supply power separately to indoor
unit and outdoor unit was applied, refer to Figure 1.
14
6-2. EHSC-VM6B
OCH532A
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
2
3
4
5
6
7
8
9
10
11
12
13
14
2
2
2
1
3
5
7
X1
X2
X3
X4
X5A
X12
X11
X6
X8
X7
TBO.2
5
3
1
F1
F2
CN01
(BLK)
Signal
output
(Error)
Signal
output
(Defrost)
Signal
output
(Booster
heater2+)
MXV
M
1
~
M
1
~
MP2
M
1
~
MP3
MP1
M
1
~
2WV2
M
1
~
1
3
CNP1
(WHT)
1
3
1
3
Signal
output
(Boiler)
1
3
CNPWM
(WHT)
CNIH
(ORN)
2
1
3
CNBHT(BLK)
X5B
X10
CNBC
(GRY)
CNBH
(WHT)
TBO.1
X9
X13
Open
Close
N
3
Signal
output
(Immersion
heater)
2
222
ECB1
L1
(1)L2(3)L3(5)
BHCP
WHT
BLK
RED
WHT
BLK
RED
BLU/No.4
WHT/No.2
WHT/No.1
BLU/No.5
WHT/No.3
BLU/No.6
VLT
VLT
PNK
PNK
GRY
GRY
BHC2
BHC1
BHT
642
531
A1
A2
642
531
A1
A2
BH1
BHF
BH2
2
46
Power supply
to Booster heater
3~ 400V 50Hz
642
531
A1
A2
WHT
BLK
RED
*
1
91011
3WV
M
1
~
*
1
TBO.1
91011
2WV1
M
1
~
TBO.1
3WV 2WV1
Table 1 Signal Inputs
Name
Terminal block Connector
Item OFF (Open) ON (Short)
IN1 TBI.1 1-2
— Room thermostat 1 input
Refer to SW2-1 in <6-11 Dip switch setting>
IN2 TBI.1 3-4 CN2F
Flow switch 1 input
Refer to SW2-2 in <6-11 Dip switch setting>
IN3 TBI.1 5-6
— Flow switch 2 input (Zone1)
Refer to SW3-2 in <6-11 Dip switch setting>
IN4 TBI.1 7-8
— Demand control input
Normal
Heat source OFF/Boiler operation *2
IN5 TBI.1 9-10
— Outdoor thermostat input *1
Standard operation
Heater operation/Boiler operation *2
IN6 TBI.1 11-12
— Room thermostat 2 input
Refer to SW3-1 in <6-11 Dip switch setting>
IN7 TBI.1 13-14
— Flow switch 3 input (Zone2)
Refer to SW3-3 in <6-11 Dip switch setting>
*1. If using outdoor thermostat for controlling operation of heaters, the lifetime of the heaters and
related parts may be reduced.
*2. To turn on the boiler operation, use the main controller to select “Boiler” in “External/input setting“
screen in the service menu.
Symbol Name Symbol Name
TB1
Terminal block <Power supply, Outdoor unit>
TH1 Thermistor (Room temp.)(Option)
ECB1
Earth leakage circuit breaker for booster heater
TH2 Thermistor (Ref. liquid temp.)
MP1
Water circulation pump1(Space heating & DHW)
THW1 Thermistor (Flow water temp.)
MP2 Water circulation pump2
(Space heating for Zone1)(Field supply)
THW2 Thermistor (Return water temp.)
THW5 Thermistor (DHW tank water temp.)(Option)
MP3 Water circulation pump3
(Space heating for Zone2)(Field supply)
THW6 Thermistor (Zone1 flow temp.)(Option)
THW7 Thermistor (Zone1 return temp.)(Option)
3WV(2WV1)
3-way valve (2-way valve1)(Field supply) THW8 Thermistor (Zone2 flow temp.)(Option)
2WV2 2-way valve2 (Field supply) THW9 Thermistor (Zone2 return temp.)(Option)
MXV Mixing valve (Field supply)
THWB1
Thermistor (Boiler flow temp.)(Option)
BHT Thermostat for booster heater
THWB2
Thermistor (Boiler return temp.)(Option)
BHF Thermal fuse for booster heater IN1 Room thermostat 1 (Field supply)
BH1 Booster heater 1 IN2 Flow switch 1
BH2 Booster heater 2 IN3 Flow switch 2 (Field supply)
BHC1 Contactor for booster heater 1 IN4 Demand control (Field supply)
BHC2 Contactor for booster heater 2 IN5 Outdoor thermostat (Field supply)
BHCP Contactor for booster heater protection IN6 Room thermostat 2 (Field supply)
IN7 Flow switch 3 (Field supply)
FLOW TEMP. CONTROLLER (FTC4)
TBO.1~2
Terminal block <Outputs>
TBI.1~2
Terminal block <Signal Inputs,Thermistor>
F1~F2
Fuse (T6.3AL250V)
SW1~4
Dip switch *See 6-11 Dip switch setting
X1~X12
Relay
LED1 Power supply (FTC4)
LED2 Power supply (Main controller)
LED3 Communication (FTC4-Outdoor unit)
LED4 Reading or writing data to SD card
CNPWM
Pump speed control signal for MP1
CN108
SD card connector
NL
S3S2S1
NL
S3S2S1
Figure 1
To outdoor
unit
TB1
ORN
ORN
YLW
BLK
BLK
YLW
GRN/YLW
To outdoor
unit
Power supply
~/N 230V 50Hz
TB1
ORN
BLU
RED
BLU
RED
YLW
GRN/YLW
1
3
CN3C
(BLU)
5
3
1
1
3
5
3
1
CN01
(BLK)
ORN
BRN
CN3C
(BLU)
CN01
(BLK)
ORN
ORN
BRN
YLW
Cylinder unit powered
by independent source.
Cylinder unit powered
via outdoor unit
CIRCUIT
BREAKER
TBO.1
3
9
5
1
7
2
8
4
6
11
10
12
13
14
TBO.2
FTC4
3
9
5
1
7
2
8
4
6
11
10
12
13
14
TBI.1
12610148
13711945321
TBI.2
12610148
13
7
11
9
4
5
321
13
CNP1(WHT)
1
5
CNV1
(WHT)
1
3
CN3C
(BLU)
5
3
1
CN01
(BLK)
18
SW3
18
SW1
LED1
LED3
118
6
SW2
SW4
TBI.1
1310 12 14117465932 81
TBI.2
1310121411
74659
3
2
81
1
2
CN20
(RED)
TH1
1
3
CN21
(YLW)
TH2
1
4
THW1
1
2
1 3
IN2
IN7
IN6
IN5
IN4
IN3
IN1
t°t
°
THWB2
THWB1
THW8
t
°
THW6
t
°
THW7
t
°
THW9
t
°
Main
controller
1
2
THW2
THW5
CNW5
(WHT)
CNW12
(RED)
t°t°t°t°t
°
1
3
1
4
CN2F
(YLW)
CN20
(RED)
CN21
(YLW)
CNW12
(RED)
CNW5
(WHT)
1
2
1
2
CN108
1
3
13
13
CNBH
(WHT)
CNBHT
(BLK)
13
CNIH
(ORN)
CNBC
(GRY)
1
7
LED4
LED2
1
2
CN22
(BLU)
CNPWM
(WHT)
1
3
5
1
Wireless receiver
(Option)
CNRF
(WHT)
5
1
CN105
(RED)
CN2F
(YLW)
CN22
(BLU)
Table 2 Outputs
Name
Terminal block Connector
Item OFF ON
OUT1
TBO.1 3-4
CNP1
Water circulation pump 1 output (Space heating & DHW) OFF ON
OUT2
TBO.1 5-6
—
Water circulation pump 2 output (Space heating for Zone1) OFF ON
OUT3
TBO.1 7-8
—
Water circulation pump 3 output (Space heating for Zone2) OFF ON
OUT4
TBO.1 9-11
CNV1
3-way valve (2-way valve1) output Heating DHW
OUT5
TBO.1 12-13
—
Mixing valve output
Stop Close
TBO.1 13-14 Stop Open
OUT6
—
CNBH 1-3
Booster heater 1 output OFF ON
OUT7
—
CNBH 5-7
Booster heater 2 output OFF ON
OUT8
TBO.2 11-12
—
Booster heater 2+ output OFF ON
OUT9
TBO.2 9-10
CNIH
Immersion heater output OFF ON
OUT10
TBO.1 1-2
—
Boiler output OFF ON
OUT11
TBO.2 1-2
—
Error output Normal Error
OUT12
TBO.2 3-4
—
Defrost output Normal Defrost
OUT13
TBO.2 7-8
—
2-way valve 2 output DHW Heating
1. Symbols used in wiring diagram are,
: connector, : terminal block.
2. Indoor unit and outdoor unit connecting wires
have polarities, make sure to match terminal numbers
(S1, S2, S3) for correct wirings,
3. Since the outdoor unit side electric wiring may change,
be sure to check the outdoor unit electric wiring
diagram for servicing.
4. This diagram shows the wiring of indoor unit and
outdoor unit connecting wires (specification of 230V),
adopting superimposed system of power and signal.
When work to supply power separately to indoor
unit and outdoor unit was applied, refer to Figure 1.
15
6-3. EHSC-YM9B
OCH532A
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
2
3
4
5
6
7
8
9
10
11
12
13
14
2
2
2
1
3
5
7
X1
X2
X3
X4
X5A
X12
X11
X6
X8
X7
TBO.2
5
3
1
F1
F2
CN01
(BLK)
Signal
output
(Error)
Signal
output
(Defrost)
Signal
output
(Booster
heater2+)
MXV
M
1
~
M
1
~
MP2
M
1
~
MP3
MP1
M
1
~
2WV2
M
1
~
1
3
CNP1
(WHT)
1
3
1
3
Signal
output
(Boiler)
1
3
CNPWM
(WHT)
CNIH
(ORN)
2
1
3
CNBHT(BLK)
X5B
X10
CNBC
(GRY)
CNBH
(WHT)
TBO.1
X9
X13
Open
Close
N
3
Signal
output
(Immersion
heater)
2
222
ECB1
L1
(1)L2(3)L3(5)
BHCP
WHT
BLK
RED
WHT
BLK
RED
VLT
VLT
PNK
PNK
GRY
GRY
BHC2
BHC1
642
531
A1
A2
642
531
A1
A2
2
46
Power supply
to Booster heater
3~ 230V 50Hz
642
531
A1
A2
WHT
BLK
RED
*
1
91011
3WV
M
1
~
*
1
TBO.1
91011
2WV1
M
1
~
TBO.1
3WV 2WV1
BLU/No.4
WHT/No.2
WHT/No.1
BLU/No.5
WHT/No.3
BLU/No.6
BHT
BH1
BHF
BH2
NL
S3S2S1
NL
S3S2S1
Figure 1
To outdoor
unit
TB1
ORN
ORN
YLW
BLK
BLK
YLW
GRN/YLW
To outdoor
unit
Power supply
~/N 230V 50Hz
TB1
ORN
BLU
RED
BLU
RED
YLW
GRN/YLW
1
3
CN3C
(BLU)
5
3
1
1
3
5
3
1
CN01
(BLK)
ORN
BRN
CN3C
(BLU)
CN01
(BLK)
ORN
ORN
BRN
YLW
Cylinder unit powered
by independent source.
Cylinder unit powered
via outdoor unit
CIRCUIT
BREAKER
TBO.1
3
9
5
1
7
2
8
4
6
11
10
12
13
14
TBO.2
FTC4
3
9
5
1
7
2
8
4
6
11
10
12
13
14
TBI.1
12610148
13711945321
TBI.2
12610 14
8
13
7
11
9
4
5
321
13
CNP1(WHT)
1
5
CNV1
(WHT)
1
3
CN3C
(BLU)
5
3
1
CN01
(BLK)
18
SW3
18
SW1
LED1
LED3
118
6
SW2
SW4
TBI.1
1310121411
7
46
59
3
2
81
TBI.2
1310121411
7
46
59
3
2
81
1
2
CN20
(RED)
TH1
1
3
CN21
(YLW)
TH2
1
4
THW1
1
2
1 3
IN2
IN7
IN6
IN5
IN4
IN3
IN1
t°t
°
THWB2
THWB1
THW8
t
°
THW6
t
°
THW7
t
°
THW9
t
°
Main
controller
1
2
THW2
THW5
CNW5
(WHT)
CNW12
(RED)
t°t°t°t°t
°
1
3
1
4
CN2F
(YLW)
CN20
(RED)
CN21
(YLW)
CNW12
(RED)
CNW5
(WHT)
1
2
1
2
CN108
1
3
13
13
CNBH
(WHT)
CNBHT
(BLK)
13
CNIH
(ORN)
CNBC
(GRY)
1
7
LED4
LED2
1
2
CN22
(BLU)
CNPWM
(WHT)
1
3
5
1
Wireless receiver
(Option)
CNRF
(WHT)
5
1
CN105
(RED)
CN2F
(YLW)
CN22
(BLU)
Table 1 Signal Inputs
Name
Terminal block Connector
Item OFF (Open) ON (Short)
IN1 TBI.1 1-2
— Room thermostat 1 input
Refer to SW2-1 in <6-11 Dip switch setting>
IN2 TBI.1 3-4 CN2F
Flow switch 1 input
Refer to SW2-2 in <6-11 Dip switch setting>
IN3 TBI.1 5-6
— Flow switch 2 input (Zone1)
Refer to SW3-2 in <6-11 Dip switch setting>
IN4 TBI.1 7-8
— Demand control input
Normal
Heat source OFF/Boiler operation *2
IN5 TBI.1 9-10
— Outdoor thermostat input *1
Standard operation
Heater operation/Boiler operation *2
IN6 TBI.1 11-12
— Room thermostat 2 input
Refer to SW3-1 in <6-11 Dip switch setting>
IN7 TBI.1 13-14
— Flow switch 3 input (Zone2)
Refer to SW3-3 in <6-11 Dip switch setting>
*1. If using outdoor thermostat for controlling operation of heaters, the lifetime of the heaters and
related parts may be reduced.
*2. To turn on the boiler operation, use the main controller to select “Boiler” in “External/input setting“
screen in the service menu.
Table 2 Outputs
Name
Terminal block Connector
Item OFF ON
OUT1
TBO.1 3-4
CNP1
Water circulation pump 1 output (Space heating & DHW) OFF ON
OUT2
TBO.1 5-6
—
Water circulation pump 2 output (Space heating for Zone1) OFF ON
OUT3
TBO.1 7-8
—
Water circulation pump 3 output (Space heating for Zone2) OFF ON
OUT4
TBO.1 9-11
CNV1
3-way valve (2-way valve1) output Heating DHW
OUT5
TBO.1 12-13
—
Mixing valve output
Stop Close
TBO.1 13-14 Stop Open
OUT6
—
CNBH 1-3
Booster heater 1 output OFF ON
OUT7
—
CNBH 5-7
Booster heater 2 output OFF ON
OUT8
TBO.2 11-12
—
Booster heater 2+ output OFF ON
OUT9
TBO.2 9-10
CNIH
Immersion heater output OFF ON
OUT10
TBO.1 1-2
—
Boiler output OFF ON
OUT11
TBO.2 1-2
—
Error output Normal Error
OUT12
TBO.2 3-4
—
Defrost output Normal Defrost
OUT13
TBO.2 7-8
—
2-way valve 2 output DHW Heating
Symbol Name Symbol Name
TB1
Terminal block <Power supply, Outdoor unit>
TH1 Thermistor (Room temp.)(Option)
ECB1
Earth leakage circuit breaker for booster heater
TH2 Thermistor (Ref. liquid temp.)
MP1
Water circulation pump1(Space heating & DHW)
THW1 Thermistor (Flow water temp.)
MP2 Water circulation pump2
(Space heating for Zone1)(Field supply)
THW2 Thermistor (Return water temp.)
THW5 Thermistor (DHW tank water temp.)(Option)
MP3 Water circulation pump3
(Space heating for Zone2)(Field supply)
THW6 Thermistor (Zone1 flow temp.)(Option)
THW7 Thermistor (Zone1 return temp.)(Option)
3WV(2WV1)
3-way valve (2-way valve1)(Field supply) THW8 Thermistor (Zone2 flow temp.)(Option)
2WV2 2-way valve2 (Field supply) THW9 Thermistor (Zone2 return temp.)(Option)
MXV Mixing valve (Field supply)
THWB1
Thermistor (Boiler flow temp.)(Option)
BHT Thermostat for booster heater
THWB2
Thermistor (Boiler return temp.)(Option)
BHF Thermal fuse for booster heater IN1 Room thermostat 1 (Field supply)
BH1 Booster heater 1 IN2 Flow switch 1
BH2 Booster heater 2 IN3 Flow switch 2 (Field supply)
BHC1 Contactor for booster heater 1 IN4 Demand control (Field supply)
BHC2 Contactor for booster heater 2 IN5 Outdoor thermostat (Field supply)
BHCP Contactor for booster heater protection IN6 Room thermostat 2 (Field supply)
IN7 Flow switch 3 (Field supply)
FLOW TEMP. CONTROLLER (FTC4)
TBO.1~2
Terminal block <Outputs>
TBI.1~2
Terminal block <Signal Inputs,Thermistor>
F1~F2
Fuse (T6.3AL250V)
SW1~4
Dip switch *See 6-11 Dip switch setting
X1~X13
Relay
LED1 Power supply (FTC4)
LED2 Power supply (Main controller)
LED3 Communication (FTC4-Outdoor unit)
LED4 Reading or writing data to SD card
CNPWM
Pump speed control signal for MP1
CN108
SD card connector
1. Symbols used in wiring diagram are,
: connector, : terminal block.
2. Indoor unit and outdoor unit connecting wires
have polarities, make sure to match terminal numbers (S1, S2, S3) for correct wirings,
3. Since the outdoor unit side electric wiring may change, be sure to check the outdoor unit
electric wiring diagram for servicing.
4. This diagram shows the wiring of indoor unit and outdoor unit connecting wires
(specification of 230V), adopting superimposed system of power and signal.
When work to supply power separately to indoor unit and outdoor unit was applied, refer
to Figure 1.
16
6-4. EHSC-TM9B
OCH532A
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
2
3
4
5
6
7
8
9
10
11
12
13
14
2
222
ECB1
L
(1)N(3)
BHCP
BLU
BLU
BLU
REDRED
BLU/No.3
WHT/No.2
WHT/No.1
BLU/No.4
RED
VLT
VLT
PNK
PNK
GRY
GRY
BHC2
BHC1
BHT
642
531
A1
A2
642
531
A1
A2
BH1
BHF
BH2
2
4
Power supply
to Booster heater
~/N 230V 50Hz
2
2
2
1
3
5
7
X1
X2
X3
X4
X5A
X12
X11
X6
X8
X7
TBO.2
5
3
1
F1
F2
CN01
(BLK)
Signal
output
(Error)
Signal
output
(Defrost)
Signal
output
(Booster
heater2+)
MXV
M
1
~
M
1
~
MP2
M
1
~
MP3
MP1
M
1
~
2WV2
M
1
~
1
3
CNP1
(WHT)
1
3
1
3
Signal
output
(Boiler)
1
3
CNPWM
(WHT)
CNIH
(ORN)
2
1
3
CNBHT(BLK)
X5B
X10
CNBC
(GRY)
CNBH
(WHT)
TBO.1
X9
X13
642
531
A1
A2
Open
Close
N
3
Signal
output
(Immersion
heater)
*
1
91011
3WV
M
1
~
*
1
TBO.1
91011
2WV1
M
1
~
TBO.1
3WV 2WV1
Table 1 Signal Inputs
Name
Terminal block Connector
Item OFF (Open) ON (Short)
IN1 TBI.1 1-2
— Room thermostat 1 input
Refer to SW2-1 in <6-11 Dip switch setting>
IN2 TBI.1 3-4 CN2F
Flow switch 1 input
Refer to SW2-2 in <6-11 Dip switch setting>
IN3 TBI.1 5-6
— Flow switch 2 input (Zone1)
Refer to SW3-2 in <6-11 Dip switch setting>
IN4 TBI.1 7-8
— Demand control input
Normal
Heat source OFF/Boiler operation *2
IN5 TBI.1 9-10
— Outdoor thermostat input *1
Standard operation
Heater operation/Boiler operation *2
IN6 TBI.1 11-12
— Room thermostat 2 input
Refer to SW3-1 in <6-11 Dip switch setting>
IN7 TBI.1 13-14
— Flow switch 3 input (Zone2)
Refer to SW3-3 in <6-11 Dip switch setting>
*1. If using outdoor thermostat for controlling operation of heaters, the lifetime of the heaters and
related parts may be reduced.
*2. To turn on the boiler operation, use the main controller to select “Boiler” in “External/input setting“
screen in the service menu.
Symbol Name Symbol Name
TB1
Terminal block <Power supply, Outdoor unit>
TH1 Thermistor (Room temp.)(Option)
ECB1
Earth leakage circuit breaker for booster heater
TH2 Thermistor (Ref. liquid temp.)
MP1
Water circulation pump1(Space heating & DHW)
THW1 Thermistor (Flow water temp.)
MP2 Water circulation pump2
(Space heating for Zone1)(Field supply)
THW2 Thermistor (Return water temp.)
THW5 Thermistor (DHW tank water temp.)(Option)
MP3 Water circulation pump3
(Space heating for Zone2)(Field supply)
THW6 Thermistor (Zone1 flow temp.)(Option)
THW7 Thermistor (Zone1 return temp.)(Option)
3WV(2WV1)
3-way valve (2-way valve1)(Field supply) THW8 Thermistor (Zone2 flow temp.)(Option)
2WV2 2-way valve2 (Field supply) THW9 Thermistor (Zone2 return temp.)(Option)
MXV Mixing valve (Field supply)
THWB1
Thermistor (Boiler flow temp.)(Option)
BHT Thermostat for booster heater
THWB2
Thermistor (Boiler return temp.)(Option)
BHF Thermal fuse for booster heater IN1 Room thermostat 1 (Field supply)
BH1 Booster heater 1 IN2 Flow switch 1
BH2 Booster heater 2 IN3 Flow switch 2 (Field supply)
BHC1 Contactor for booster heater 1 IN4 Demand control (Field supply)
BHC2 Contactor for booster heater 2 IN5 Outdoor thermostat (Field supply)
BHCP Contactor for booster heater protection IN6 Room thermostat 2 (Field supply)
IN7 Flow switch 3 (Field supply)
FLOW TEMP. CONTROLLER (FTC4)
TBO.1~2
Terminal block <Outputs>
TBI.1~2
Terminal block <Signal Inputs,Thermistor>
F1~F2
Fuse (T6.3AL250V)
SW1~4
Dip switch *See 6-11 Dip switch setting
X1~X12
Relay
LED1 Power supply (FTC4)
LED2 Power supply (Main controller)
LED3 Communication (FTC4-Outdoor unit)
LED4 Reading or writing data to SD card
CNPWM
Pump speed control signal for MP1
CN108
SD card connector
NL
S3S2S1
NL
S3S2S1
Figure 1
To outdoor
unit
TB1
ORN
ORN
YLW
BLK
BLK
YLW
GRN/YLW
To outdoor
unit
Power supply
~/N 230V 50Hz
TB1
ORN
BLU
RED
BLU
RED
YLW
GRN/YLW
1
3
CN3C
(BLU)
5
3
1
1
3
5
3
1
CN01
(BLK)
ORN
BRN
CN3C
(BLU)
CN01
(BLK)
ORN
ORN
BRN
YLW
Cylinder unit powered
by independent source.
Cylinder unit powered
via outdoor unit
CIRCUIT
BREAKER
TBO.1
3
9
5
1
7
2
8
4
6
11
10
12
13
14
TBO.2
FTC4
3
9
5
1
7
2
8
4
6
11
10
12
13
14
TBI.1
12610148
137119453
2
1
TBI.2
12610 148
13
7
11
9
4
5
321
13
CNP1(WHT)
1
5
CNV1
(WHT)
1
3
CN3C
(BLU)
5
3
1
CN01
(BLK)
18
SW3
18
SW1
LED1
LED3
118
6
SW2
SW4
TBI.1
1310 12 14117465932 81
TBI.2
1310121411
74659
3
2
81
1
2
CN20
(RED)
TH1
1
3
CN21
(YLW)
TH2
1
4
THW1
1
2
1 3
IN2
IN7
IN6
IN5
IN4
IN3
IN1
t°t
°
THWB2
THWB1
THW8
t
°
THW6
t
°
THW7
t
°
THW9
t
°
Main
controller
1
2
THW2
THW5
CNW5
(WHT)
CNW12
(RED)
t°t°t°t°t
°
1
3
1
4
CN2F
(YLW)
CN20
(RED)
CN21
(YLW)
CNW12
(RED)
CNW5
(WHT)
1
2
1
2
CN108
1
3
13
13
CNBH
(WHT)
CNBHT
(BLK)
13
CNIH
(ORN)
CNBC
(GRY)
1
7
LED4
LED2
1
2
CN22
(BLU)
CNPWM
(WHT)
1
3
5
1
Wireless receiver
(Option)
CNRF
(WHT)
5
1
CN105
(RED)
CN2F
(YLW)
CN22
(BLU)
Table 2 Outputs
Name
Terminal block Connector
Item OFF ON
OUT1
TBO.1 3-4
CNP1
Water circulation pump 1 output (Space heating & DHW) OFF ON
OUT2
TBO.1 5-6
—
Water circulation pump 2 output (Space heating for Zone1) OFF ON
OUT3
TBO.1 7-8
—
Water circulation pump 3 output (Space heating for Zone2) OFF ON
OUT4
TBO.1 9-11
CNV1
3-way valve (2-way valve1) output Heating DHW
OUT5
TBO.1 12-13
—
Mixing valve output
Stop Close
TBO.1 13-14 Stop Open
OUT6
—
CNBH 1-3
Booster heater 1 output OFF ON
OUT7
—
CNBH 5-7
Booster heater 2 output OFF ON
OUT8
TBO.2 11-12
—
Booster heater 2+ output OFF ON
OUT9
TBO.2 9-10
CNIH
Immersion heater output OFF ON
OUT10
TBO.1 1-2
—
Boiler output OFF ON
OUT11
TBO.2 1-2
—
Error output Normal Error
OUT12
TBO.2 3-4
—
Defrost output Normal Defrost
OUT13
TBO.2 7-8
—
2-way valve 2 output DHW Heating
1. Symbols used in wiring diagram are,
: connector, : terminal block.
2. Indoor unit and outdoor unit connecting wires
have polarities, make sure to match terminal numbers
(S1, S2, S3) for correct wirings,
3. Since the outdoor unit side electric wiring may change,
be sure to check the outdoor unit electric wiring
diagram for servicing.
4. This diagram shows the wiring of indoor unit and
outdoor unit connecting wires (specification of 230V),
adopting superimposed system of power and signal.
When work to supply power separately to indoor
unit and outdoor unit was applied, refer to Figure 1.
17
6-5. EHSC-VM6EB
OCH532A
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
2
3
4
5
6
7
8
9
10
11
12
13
14
2
2
2
1
3
5
7
X1
X2
X3
X4
X5A
X12
X11
X6
X8
X7
TBO.2
5
3
1
F1
F2
CN01
(BLK)
Signal
output
(Error)
Signal
output
(Defrost)
Signal
output
(Booster
heater2+)
MXV
M
1
~
M
1
~
MP2
M
1
~
MP3
MP1
M
1
~
2WV2
M
1
~
1
3
CNP1
(WHT)
1
3
1
3
Signal
output
(Boiler)
1
3
CNPWM
(WHT)
CNIH
(ORN)
2
1
3
CNBHT(BLK)
X5B
X10
CNBC
(GRY)
CNBH
(WHT)
TBO.1
X9
X13
Open
Close
N
3
Signal
output
(Immersion
heater)
2
222
ECB1
L1
(1)L2(3)L3(5)
BHCP
WHT
BLK
RED
WHT
BLK
RED
BLU/No.4
WHT/No.2
WHT/No.1
BLU/No.5
WHT/No.3
BLU/No.6
VLT
VLT
PNK
PNK
GRY
GRY
BHC2
BHC1
BHT
642
531
A1
A2
642
531
A1
A2
BH1
BHF
BH2
2
46
Power supply
to Booster heater
3~ 400V 50Hz
642
531
A1
A2
WHT
BLK
RED
*
1
91011
3WV
M
1
~
*
1
TBO.1
91011
2WV1
M
1
~
TBO.1
3WV 2WV1
Table 1 Signal Inputs
Name
Terminal block Connector
Item OFF (Open) ON (Short)
IN1 TBI.1 1-2
— Room thermostat 1 input
Refer to SW2-1 in <6-11 Dip switch setting>
IN2 TBI.1 3-4 CN2F
Flow switch 1 input
Refer to SW2-2 in <6-11 Dip switch setting>
IN3 TBI.1 5-6
— Flow switch 2 input (Zone1)
Refer to SW3-2 in <6-11 Dip switch setting>
IN4 TBI.1 7-8
— Demand control input
Normal
Heat source OFF/Boiler operation *2
IN5 TBI.1 9-10
— Outdoor thermostat input *1
Standard operation
Heater operation/Boiler operation *2
IN6 TBI.1 11-12
— Room thermostat 2 input
Refer to SW3-1 in <6-11 Dip switch setting>
IN7 TBI.1 13-14
— Flow switch 3 input (Zone2)
Refer to SW3-3 in <6-11 Dip switch setting>
*1. If using outdoor thermostat for controlling operation of heaters, the lifetime of the heaters and
related parts may be reduced.
*2. To turn on the boiler operation, use the main controller to select “Boiler” in “External/input setting“
screen in the service menu.
Symbol Name Symbol Name
TB1
Terminal block <Power supply, Outdoor unit>
TH1 Thermistor (Room temp.)(Option)
ECB1
Earth leakage circuit breaker for booster heater
TH2 Thermistor (Ref. liquid temp.)
MP1
Water circulation pump1(Space heating & DHW)
THW1 Thermistor (Flow water temp.)
MP2 Water circulation pump2
(Space heating for Zone1)(Field supply)
THW2 Thermistor (Return water temp.)
THW5 Thermistor(DHW tank water temp.)(Option)
MP3 Water circulation pump3
(Space heating for Zone2)(Field supply)
THW6 Thermistor (Zone1 flow temp.)(Option)
THW7 Thermistor (Zone1 return temp.)(Option)
3WV(2WV1)
3-way valve (2-way valve1)(Field supply) THW8 Thermistor (Zone2 flow temp.)(Option)
2WV2 2-way valve2 (Field supply) THW9 Thermistor (Zone2 return temp.)(Option)
MXV Mixing valve (Field supply)
THWB1
Thermistor (Boiler flow temp.)(Option)
BHT Thermostat for booster heater
THWB2
Thermistor (Boiler return temp.)(Option)
BHF Thermal fuse for booster heater IN1 Room thermostat 1 (Field supply)
BH1 Booster heater 1 IN2 Flow switch 1
BH2 Booster heater 2 IN3 Flow switch 2 (Field supply)
BHC1 Contactor for booster heater 1 IN4 Demand control (Field supply)
BHC2 Contactor for booster heater 2 IN5 Outdoor thermostat (Field supply)
BHCP Contactor for booster heater protection IN6 Room thermostat 2 (Field supply)
IN7 Flow switch 3 (Field supply)
FLOW TEMP. CONTROLLER (FTC4)
TBO.1~2
Terminal block <Outputs>
TBI.1~2
Terminal block <Signal Inputs,Thermistor>
F1~F2
Fuse (T6.3AL250V)
SW1~4
Dip switch *See 6-11 Dip switch setting
X1~X12
Relay
LED1 Power supply (FTC4)
LED2 Power supply (Main controller)
LED3 Communication (FTC4-Outdoor unit)
LED4 Reading or writing data to SD card
CNPWM
Pump speed control signal for MP1
CN108
SD card connector
NL
S3S2S1
NL
S3S2S1
Figure 1
To outdoor
unit
TB1
ORN
ORN
YLW
BLK
BLK
YLW
GRN/YLW
To outdoor
unit
Power supply
~/N 230V 50Hz
TB1
ORN
BLU
RED
BLU
RED
YLW
GRN/YLW
1
3
CN3C
(BLU)
5
3
1
1
3
5
3
1
CN01
(BLK)
ORN
BRN
CN3C
(BLU)
CN01
(BLK)
ORN
ORN
BRN
YLW
Cylinder unit powered
by independent source.
Cylinder unit powered
via outdoor unit
CIRCUIT
BREAKER
TBO.1
3
9
5
1
7
2
8
4
6
11
10
12
13
14
TBO.2
FTC4
3
9
5
1
7
2
8
4
6
11
10
12
13
14
TBI.1
12610148
137119453
2
1
TBI.2
12610 148
13
7
11
9
4
5
321
13
CNP1(WHT)
1
5
CNV1
(WHT)
1
3
CN3C
(BLU)
5
3
1
CN01
(BLK)
18
SW3
18
SW1
LED1
LED3
118
6
SW2
SW4
TBI.1
1310 12 14117465932 81
TBI.2
1310 12 14117465932 81
1
2
CN20
(RED)
TH1
1
3
CN21
(YLW)
TH2
1
4
THW1
1
2
1
3
IN2
IN7
IN6
IN5
IN4
IN3
IN1
t°t
°
THWB2
THWB1
THW8
t
°
THW6
t
°
THW7
t
°
THW9
t
°
Main
controller
1 2
THW2
THW5
CNW5
(WHT)
CNW12
(RED)
t°t°t°t°t
°
1
3
1
4
CN2F
(YLW)
CN20
(RED)
CN21
(YLW)
CNW12
(RED)
CNW5
(WHT)
1
2
1
2
CN108
1
3
13
13
CNBH
(WHT)
CNBHT
(BLK)
13
CNIH
(ORN)
CNBC
(GRY)
1
7
LED4
LED2
1
2
CN22
(BLU)
CNPWM
(WHT)
1
3
5
1
Wireless receiver
(Option)
CNRF
(WHT)
5
1
CN105
(RED)
CN2F
(YLW)
CN22
(BLU)
Table 2 Outputs
Name
Terminal block Connector
Item OFF ON
OUT1
TBO.1 3-4
CNP1
Water circulation pump 1 output (Space heating & DHW) OFF ON
OUT2
TBO.1 5-6
—
Water circulation pump 2 output (Space heating for Zone1) OFF ON
OUT3
TBO.1 7-8
—
Water circulation pump 3 output (Space heating for Zone2) OFF ON
OUT4
TBO.1 9-11
CNV1
3-way valve (2-way valve1) output Heating DHW
OUT5
TBO.1 12-13
—
Mixing valve output
Stop Close
TBO.1 13-14 Stop Open
OUT6
—
CNBH 1-3
Booster heater 1 output OFF ON
OUT7
—
CNBH 5-7
Booster heater 2 output OFF ON
OUT8
TBO.2 11-12
—
Booster heater 2+ output OFF ON
OUT9
TBO.2 9-10
CNIH
Immersion heater output OFF ON
OUT10
TBO.1 1-2
—
Boiler output OFF ON
OUT11
TBO.2 1-2
—
Error output Normal Error
OUT12
TBO.2 3-4
—
Defrost output Normal Defrost
OUT13
TBO.2 7-8
—
2-way valve 2 output DHW Heating
1. Symbols used in wiring diagram are,
: connector, : terminal block.
2. Indoor unit and outdoor unit connecting wires
have polarities, make sure to match terminal numbers
(S1, S2, S3) for correct wirings,
3. Since the outdoor unit side electric wiring may change,
be sure to check the outdoor unit electric wiring
diagram for servicing.
4. This diagram shows the wiring of indoor unit and
outdoor unit connecting wires (specification of 230V),
adopting superimposed system of power and signal.
When work to supply power separately to indoor
unit and outdoor unit was applied, refer to Figure 1.
18
6-6. EHSC-YM9EB
OCH532A
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
2
3
4
5
6
7
8
9
10
11
12
13
14
2
2
1
3
5
7
X1
X2
X3
X4
X5A
X12
X11
X6
X8
X7
TBO.2
5
3
1
F1
F2
CN01
(BLK)
Signal
output
(Error)
Signal
output
(Defrost)
Signal
output
(Booster
heater2+)
MXV
M
1
~
M
1
~
MP2
M
1
~
MP3
MP1
M
1
~
2WV2
M
1
~
1
3
CNP1
(WHT)
1
3
1
3
Signal
output
(Boiler)
1
3
CNPWM
(WHT)
CNIH
(ORN)
2
1
3
CNBHT(BLK)
X5B
X10
CNBC
(GRY)
CNBH
(WHT)
TBO.1
X9
X13
Open
Close
N
3
Signal
output
(Immersion
heater)
2
22
ECB1
L
(1)N(3)
BHCP
BLU
BLU
RED
WHT/No.2
WHT/No.1
RED
VLT
VLT
GRY
GRY
BHC1
BHT
642
531
A1
A2
BH1
BHF
2
4
Power supply
to Booster heater
~/N 230V 50Hz
642
531
A1
A2
*
1
91011
3WV
M
1
~
*
1
TBO.1
91011
2WV1
M
1
~
TBO.1
3WV 2WV1
Table 1 Signal Inputs
Name
Terminal block Connector
Item OFF (Open) ON (Short)
IN1 TBI.1 1-2
— Room thermostat 1 input
Refer to SW2-1 in <6-11 Dip switch setting>
IN2 TBI.1 3-4 CN2F
Flow switch 1 input
Refer to SW2-2 in <6-11 Dip switch setting>
IN3 TBI.1 5-6
— Flow switch 2 input (Zone1)
Refer to SW3-2 in <6-11 Dip switch setting>
IN4 TBI.1 7-8
— Demand control input
Normal
Heat source OFF/Boiler operation *2
IN5 TBI.1 9-10
— Outdoor thermostat input *1
Standard operation
Heater operation/Boiler operation *2
IN6 TBI.1 11-12
— Room thermostat 2 input
Refer to SW3-1 in <6-11 Dip switch setting>
IN7 TBI.1 13-14
— Flow switch 3 input (Zone2)
Refer to SW3-3 in <6-11 Dip switch setting>
*1. If using outdoor thermostat for controlling operation of heaters, the lifetime of the heaters and
related parts may be reduced.
*2. To turn on the boiler operation, use the main controller to select “Boiler” in “External/input setting“
screen in the service menu.
Symbol Name Symbol Name
TB1
Terminal block <Power supply, Outdoor unit>
TH1 Thermistor (Room temp.)(Option)
ECB1
Earth leakage circuit breaker for booster heater
THW1 Thermistor (Flow water temp.)
MP1
Water circulation pump1(Space heating & DHW)
THW2 Thermistor (Return water temp.)
MP2 Water circulation pump2
(Space heating for Zone1)(Field supply)
THW5 Thermistor (DHW tank water temp.)(Option)
THW6 Thermistor (Zone1 flow temp.)(Option)
MP3 Water circulation pump3
(Space heating for Zone2)(Field supply)
THW7 Thermistor (Zone1 return temp.)(Option)
THW8 Thermistor (Zone2 flow temp.)(Option)
3WV(2WV1)
3-way valve (2-way valve1)(Field supply) THW9 Thermistor (Zone2 return temp.)(Option)
2WV2 2-way valve2 (Field supply)
THWB1
Thermistor (Boiler flow temp.)(Option)
MXV Mixing valve (Field supply)
THWB2
Thermistor (Boiler return temp.)(Option)
BHT Thermostat for booster heater IN1 Room thermostat 1 (Field supply)
BHF Thermal fuse for booster heater IN2 Flow switch 1
BH1 Booster heater 1 IN3 Flow switch 2 (Field supply)
BHC1 Contactor for booster heater 1 IN4 Demand control (Field supply)
BHCP Contactor for booster heater protection IN5 Outdoor thermostat (Field supply)
IN6 Room thermostat 2 (Field supply)
IN7 Flow switch 3 (Field supply)
FLOW TEMP. CONTROLLER (FTC4)
TBO.1~2
Terminal block <Outputs>
TBI.1~2
Terminal block <Signal Inputs,Thermistor>
F1~F2
Fuse (T6.3AL250V)
SW1~4
Dip switch *See 6-11 Dip switch setting
X1~X12
Relay
LED1 Power supply (FTC4)
LED2 Power supply (Main controller)
LED3 Communication (FTC4-Outdoor unit)
LED4 Reading or writing data to SD card
CNPWM
Pump speed control signal for MP1
CN108
SD card connector
NL
S3S2S1
NL
S3S2S1
Figure 1
To outdoor
unit
TB1
ORN
ORN
YLW
BLK
BLK
YLW
GRN/YLW
To outdoor
unit
Power supply
~/N 230V 50Hz
TB1
ORN
BLU
RED
BLU
RED
YLW
GRN/YLW
1
3
CN3C
(BLU)
5
3
1
1
3
5
3
1
CN01
(BLK)
ORN
BRN
CN3C
(BLU)
CN01
(BLK)
ORN
ORN
BRN
YLW
Cylinder unit powered
by independent source.
Cylinder unit powered
via outdoor unit
CIRCUIT
BREAKER
TBO.1
3
9
5
1
7
2
8
4
6
11
10
12
13
14
TBO.2
FTC4
3
9
5
1
7
2
8
4
6
11
10
12
13
14
TBI.1
12610148
13711945321
TBI.2
12610 148
13
7
11
9
4
5
321
13
CNP1(WHT)
1
5
CNV1
(WHT)
1
3
CN3C
(BLU)
5
3
1
CN01
(BLK)
18
SW3
18
SW1
LED1
LED3
118
6
SW2
SW4
TBI.1
1310 12 1411746593281
TBI.2
1310121411
74659
3
2
81
1
2
CN20
(RED)
TH1
1
4
THW1
1
2
1
3
IN2
IN7
IN6
IN5
IN4
IN3
IN1
t°t
°
THWB2
THWB1
THW8
t
°
THW6
t
°
THW7
t
°
THW9
t
°
Main
controller
1 2
THW2
THW5
CNW5
(WHT)
CNW12
(RED)
t
°
t°t°t
°
1
3
1
4
CN2F
(YLW)
CN20
(RED)
CN21
(YLW)
CNW12
(RED)
CNW5
(WHT)
1
2
1
2
CN108
1
3
13
13
CNBH
(WHT)
CNBHT
(BLK)
13
CNIH
(ORN)
CNBC
(GRY)
1
7
LED4
LED2
1
2
CN22
(BLU)
CNPWM
(WHT)
1
3
5
1
Wireless receiver
(Option)
CNRF
(WHT)
5
1
CN105
(RED)
CN2F
(YLW)
CN22
(BLU)
Table 2 Outputs
Name
Terminal block Connector
Item OFF ON
OUT1
TBO.1 3-4
CNP1
Water circulation pump 1 output (Space heating & DHW) OFF ON
OUT2
TBO.1 5-6
—
Water circulation pump 2 output (Space heating for Zone1) OFF ON
OUT3
TBO.1 7-8
—
Water circulation pump 3 output (Space heating for Zone2) OFF ON
OUT4
TBO.1 9-11
CNV1
3-way valve (2-way valve1) output Heating DHW
OUT5
TBO.1 12-13
—
Mixing valve output
Stop Close
TBO.1 13-14 Stop Open
OUT6
—
CNBH 1-3
Booster heater 1 output OFF ON
OUT7
—
CNBH 5-7
Booster heater 2 output OFF ON
OUT8
TBO.2 11-12
—
Booster heater 2+ output OFF ON
OUT9
TBO.2 9-10
CNIH
Immersion heater output OFF ON
OUT10
TBO.1 1-2
—
Boiler output OFF ON
OUT11
TBO.2 1-2
—
Error output Normal Error
OUT12
TBO.2 3-4
—
Defrost output Normal Defrost
OUT13
TBO.2 7-8
—
2-way valve 2 output DHW Heating
1. Symbols used in wiring diagram are,
: connector, : terminal block.
2. Indoor unit and outdoor unit connecting wires
have polarities, make sure to match terminal numbers
(S1, S2, S3) for correct wirings,
3. Since the outdoor unit side electric wiring may change,
be sure to check the outdoor unit electric wiring
diagram for servicing.
4. This diagram shows the wiring of indoor unit and
outdoor unit connecting wires (specification of 230V),
adopting superimposed system of power and signal.
When work to supply power separately to indoor
unit and outdoor unit was applied, refer to Figure 1.
19
6-7. EHPX-VM2B
OCH532A
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
2
3
4
5
6
7
8
9
10
11
12
13
14
2
222
ECB1
L
(1)N(3)
BHCP
BLU
BLU
BLU
REDRED
BLU/No.3
WHT/No.2
WHT/No.1
BLU/No.4
RED
VLT
VLT
PNK
PNK
GRY
GRY
BHC2
BHC1
BHT
642
531
A1
A2
642
531
A1
A2
BH1
BHF
BH2
2
4
Power supply
to Booster heater
~/N 230V 50Hz
2
2
2
1
3
5
7
X1
X2
X3
X4
X5A
X12
X11
X6
X8
X7
TBO.2
5
3
1
F1
F2
CN01
(BLK)
Signal
output
(Error)
Signal
output
(Defrost)
Signal
output
(Booster
heater2+)
MXV
M
1
~
M
1
~
MP2
M
1
~
MP3
MP1
M
1
~
2WV2
M
1
~
1
3
CNP1
(WHT)
1
3
1
3
Signal
output
(Boiler)
1
3
CNPWM
(WHT)
CNIH
(ORN)
2
1
3
CNBHT(BLK)
X5B
X10
CNBC
(GRY)
CNBH
(WHT)
TBO.1
X9
X13
642
531
A1
A2
Open
Close
N
3
Signal
output
(Immersion
heater)
*
1
91011
3WV
M
1
~
*
1
TBO.1
91011
2WV1
M
1
~
TBO.1
3WV 2WV1
Table 1 Signal Inputs
Name
Terminal block Connector
Item OFF (Open) ON (Short)
IN1 TBI.1 1-2
— Room thermostat 1 input
Refer to SW2-1 in <6-11 Dip switch setting>
IN2 TBI.1 3-4 CN2F
Flow switch 1 input
Refer to SW2-2 in <6-11 Dip switch setting>
IN3 TBI.1 5-6
— Flow switch 2 input (Zone1)
Refer to SW3-2 in <6-11 Dip switch setting>
IN4 TBI.1 7-8
— Demand control input
Normal
Heat source OFF/Boiler operation *2
IN5 TBI.1 9-10
— Outdoor thermostat input *1
Standard operation
Heater operation/Boiler operation *2
IN6 TBI.1 11-12
— Room thermostat 2 input
Refer to SW3-1 in <6-11 Dip switch setting>
IN7 TBI.1 13-14
— Flow switch 3 input (Zone2)
Refer to SW3-3 in <6-11 Dip switch setting>
*1. If using outdoor thermostat for controlling operation of heaters, the lifetime of the heaters and
related parts may be reduced.
*2. To turn on the boiler operation, use the main controller to select “Boiler” in “External/input setting“
screen in the service menu.
Symbol Name Symbol Name
TB1
Terminal block <Power supply, Outdoor unit>
TH1 Thermistor (Room temp.)(Option)
ECB1
Earth leakage circuit breaker for booster heater
THW1 Thermistor (Flow water temp.)
MP1
Water circulation pump1(Space heating & DHW)
THW2 Thermistor (Return water temp.)
MP2 Water circulation pump2
(Space heating for Zone1)(Field supply)
THW5 Thermistor (DHW tank water temp.)(Option)
THW6 Thermistor (Zone1 flow temp.)(Option)
MP3 Water circulation pump3
(Space heating for Zone2)(Field supply)
THW7 Thermistor (Zone1 return temp.)(Option)
THW8 Thermistor (Zone2 flow temp.)(Option)
3WV(2WV1)
3-way valve (2-way valve1)(Field supply) THW9 Thermistor (Zone2 return temp.)(Option)
2WV2 2-way valve2 (Field supply)
THWB1
Thermistor (Boiler flow temp.)(Option)
MXV Mixing valve (Field supply)
THWB2
Thermistor (Boiler return temp.)(Option)
BHT Thermostat for booster heater IN1 Room thermostat 1 (Field supply)
BHF Thermal fuse for booster heater IN2 Flow switch 1
BH1 Booster heater 1 IN3 Flow switch 2 (Field supply)
BH2 Booster heater 2 IN4 Demand control (Field supply)
BHC1 Contactor for booster heater 1 IN5 Outdoor thermostat (Field supply)
BHC2 Contactor for booster heater 2 IN6 Room thermostat 2 (Field supply)
BHCP Contactor for booster heater protection IN7 Flow switch 3 (Field supply)
FLOW TEMP. CONTROLLER (FTC4)
TBO.1~2
Terminal block <Outputs>
TBI.1~2
Terminal block <Signal Inputs,Thermistor>
F1~F2
Fuse (T6.3AL250V)
SW1~4
Dip switch *See 6-11 Dip switch setting
X1~X12
Relay
LED1 Power supply (FTC4)
LED2 Power supply (Main controller)
LED3 Communication (FTC4-Outdoor unit)
LED4 Reading or writing data to SD card
CNPWM
Pump speed control signal for MP1
CN108
SD card connector
NL
S3S2S1
NL
S3S2S1
Figure 1
To o utdoo r
unit
TB1
ORN
ORN
YLW
BLK
BLK
YLW
GRN/YLW
To outdoor
unit
Power supply
~/N 230V 50Hz
TB1
ORN
BLU
RED
BLU
RED
YLW
GRN/YLW
1
3
CN3C
(BLU)
5
3
1
1
3
5
3
1
CN01
(BLK)
ORN
BRN
CN3C
(BLU)
CN01
(BLK)
ORN
ORN
BRN
YLW
Cylinder unit powered
by independent source.
Cylinder unit powered
via outdoor unit
CIRCUIT
BREAKER
TBO.1
3
9
5
1
7
2
8
4
6
11
10
12
13
14
TBO.2
FTC4
3
9
5
1
7
2
8
4
6
11
10
12
13
14
TBI.1
12610148
13711945321
TBI.2
12610 148
13
7
11
9
4
5
321
13
CNP1(WHT)
1
5
CNV1
(WHT)
1
3
CN3C
(BLU)
5
3
1
CN01
(BLK)
18
SW3
18
SW1
LED1
LED3
118
6
SW2
SW4
TBI.1
1310 12 1411746593281
TBI.2
1310121411
74659
3
2
81
1
2
CN20
(RED)
TH1
1
4
THW1
1
2
1 3
IN2
IN7
IN6
IN5
IN4
IN3
IN1
t°t
°
THWB2
THWB1
THW8
t
°
THW6
t
°
THW7
t
°
THW9
t
°
Main
controller
1 2
THW2
THW5
CNW5
(WHT)
CNW12
(RED)
t
°
t°t°t
°
1
3
1
4
CN2F
(YLW)
CN20
(RED)
CN21
(YLW)
CNW12
(RED)
CNW5
(WHT)
1
2
1
2
CN108
1
3
13
13
CNBH
(WHT)
CNBHT
(BLK)
13
CNIH
(ORN)
CNBC
(GRY)
1
7
LED4
LED2
1
2
CN22
(BLU)
CNPWM
(WHT)
1
3
5
1
Wireless receiver
(Option)
CNRF
(WHT)
5
1
CN105
(RED)
CN2F
(YLW)
CN22
(BLU)
Table 2 Outputs
Name
Terminal block Connector
Item OFF ON
OUT1
TBO.1 3-4
CNP1
Water circulation pump 1 output (Space heating & DHW) OFF ON
OUT2
TBO.1 5-6
—
Water circulation pump 2 output (Space heating for Zone1) OFF ON
OUT3
TBO.1 7-8
—
Water circulation pump 3 output (Space heating for Zone2) OFF ON
OUT4
TBO.1 9-11
CNV1
3-way valve (2-way valve1) output Heating DHW
OUT5
TBO.1 12-13
—
Mixing valve output
Stop Close
TBO.1 13-14 Stop Open
OUT6
—
CNBH 1-3
Booster heater 1 output OFF ON
OUT7
—
CNBH 5-7
Booster heater 2 output OFF ON
OUT8
TBO.2 11-12
—
Booster heater 2+ output OFF ON
OUT9
TBO.2 9-10
CNIH
Immersion heater output OFF ON
OUT10
TBO.1 1-2
—
Boiler output OFF ON
OUT11
TBO.2 1-2
—
Error output Normal Error
OUT12
TBO.2 3-4
—
Defrost output Normal Defrost
OUT13
TBO.2 7-8
—
2-way valve 2 output DHW Heating
1. Symbols used in wiring diagram are,
: connector, : terminal block.
2. Indoor unit and outdoor unit connecting wires
have polarities, make sure to match terminal numbers
(S1, S2, S3) for correct wirings,
3. Since the outdoor unit side electric wiring may change,
be sure to check the outdoor unit electric wiring
diagram for servicing.
4. This diagram shows the wiring of indoor unit and
outdoor unit connecting wires (specification of 230V),
adopting superimposed system of power and signal.
When work to supply power separately to indoor
unit and outdoor unit was applied, refer to Figure 1.
20
6-8. EHPX-VM6B
OCH532A
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
2
3
4
5
6
7
8
9
10
11
12
13
14
2
2
2
1
3
5
7
X1
X2
X3
X4
X5A
X12
X11
X6
X8
X7
TBO.2
5
3
1
F1
F2
CN01
(BLK)
Signal
output
(Error)
Signal
output
(Defrost)
Signal
output
(Booster
heater2+)
MXV
M
1
~
M
1
~
MP2
M
1
~
MP3
MP1
M
1
~
2WV2
M
1
~
1
3
CNP1
(WHT)
1
3
1
3
Signal
output
(Boiler)
1
3
CNPWM
(WHT)
CNIH
(ORN)
2
1
3
CNBHT(BLK)
X5B
X10
CNBC
(GRY)
CNBH
(WHT)
TBO.1
X9
X13
Open
Close
N
3
Signal
output
(Immersion
heater)
2
222
ECB1
L1
(1)L2(3)L3(5)
BHCP
WHT
BLK
RED
WHT
BLK
RED
BLU/No.4
WHT/No.2
WHT/No.1
BLU/No.5
WHT/No.3
BLU/No.6
VLT
VLT
PNK
PNK
GRY
GRY
BHC2
BHC1
BHT
642
531
A1
A2
642
531
A1
A2
BH1
BHF
BH2
2
46
Power supply
to Booster heater
3~ 400V 50Hz
642
531
A1
A2
WHT
BLK
RED
*
1
91011
3WV
M
1
~
*
1
TBO.1
91011
2WV1
M
1
~
TBO.1
3WV 2WV1
Table 1 Signal Inputs
Name
Terminal block Connector
Item OFF (Open) ON (Short)
IN1 TBI.1 1-2
— Room thermostat 1 input
Refer to SW2-1 in <6-11 Dip switch setting>
IN2 TBI.1 3-4 CN2F
Flow switch 1 input
Refer to SW2-2 in <6-11 Dip switch setting>
IN3 TBI.1 5-6
— Flow switch 2 input (Zone1)
Refer to SW3-2 in <6-11 Dip switch setting>
IN4 TBI.1 7-8
— Demand control input
Normal
Heat source OFF/Boiler operation *2
IN5 TBI.1 9-10
— Outdoor thermostat input *1
Standard operation
Heater operation/Boiler operation *2
IN6 TBI.1 11-12
— Room thermostat 2 input
Refer to SW3-1 in <6-11 Dip switch setting>
IN7 TBI.1 13-14
— Flow switch 3 input (Zone2)
Refer to SW3-3 in <6-11 Dip switch setting>
*1. If using outdoor thermostat for controlling operation of heaters, the lifetime of the heaters and
related parts may be reduced.
*2. To turn on the boiler operation, use the main controller to select “Boiler” in “External/input setting“
screen in the service menu.
Symbol Name Symbol Name
TB1
Terminal block <Power supply, Outdoor unit>
TH1 Thermistor (Room temp.)(Option)
ECB1
Earth leakage circuit breaker for booster heater
THW1 Thermistor (Flow water temp.)
MP1
Water circulation pump1(Space heating & DHW)
THW2 Thermistor (Return water temp.)
MP2 Water circulation pump2
(Space heating for Zone1)(Field supply)
THW5 Thermistor(DHW tank water temp.)(Option)
THW6 Thermistor (Zone1 flow temp.)(Option)
MP3 Water circulation pump3
(Space heating for Zone2)(Field supply)
THW7 Thermistor (Zone1 return temp.)(Option)
THW8 Thermistor (Zone2 flow temp.)(Option)
3WV(2WV1)
3-way valve (2-way valve1)(Field supply) THW9 Thermistor (Zone2 return temp.)(Option)
2WV2 2-way valve2 (Field supply)
THWB1
Thermistor (Boiler flow temp.)(Option)
MXV Mixing valve (Field supply)
THWB2
Thermistor (Boiler return temp.)(Option)
BHT Thermostat for booster heater IN1 Room thermostat 1 (Field supply)
BHF Thermal fuse for booster heater IN2 Flow switch 1
BH1 Booster heater 1 IN3 Flow switch 2 (Field supply)
BH2 Booster heater 2 IN4 Demand control (Field supply)
BHC1 Contactor for booster heater 1 IN5 Outdoor thermostat (Field supply)
BHC2 Contactor for booster heater 2 IN6 Room thermostat 2 (Field supply)
BHCP Contactor for booster heater protection IN7 Flow switch 3 (Field supply)
FLOW TEMP. CONTROLLER (FTC4)
TBO.1~2
Terminal block <Outputs>
TBI.1~2
Terminal block <Signal Inputs,Thermistor>
F1~F2
Fuse (T6.3AL250V)
SW1~4
Dip switch *See 6-11 Dip switch setting
X1~X12
Relay
LED1 Power supply (FTC4)
LED2 Power supply (Main controller)
LED3 Communication (FTC4-Outdoor unit)
LED4 Reading or writing data to SD card
CNPWM
Pump speed control signal for MP1
CN108
SD card connector
NL
S3S2S1
NL
S3S2S1
Figure 1
To outdoor
unit
TB1
ORN
ORN
YLW
BLK
BLK
YLW
GRN/YLW
To outdoor
unit
Power supply
~/N 230V 50Hz
TB1
ORN
BLU
RED
BLU
RED
YLW
GRN/YLW
1
3
CN3C
(BLU)
5
3
1
1
3
5
3
1
CN01
(BLK)
ORN
BRN
CN3C
(BLU)
CN01
(BLK)
ORN
ORN
BRN
YLW
Cylinder unit powered
by independent source.
Cylinder unit powered
via outdoor unit
CIRCUIT
BREAKER
TBO.1
3
9
5
1
7
2
8
4
6
11
10
12
13
14
TBO.2
FTC4
3
9
5
1
7
2
8
4
6
11
10
12
13
14
TBI.1
12610148
137119453
2
1
TBI.2
12610 148
13
7
11
9
4
5
321
13
CNP1(WHT)
1
5
CNV1
(WHT)
1
3
CN3C
(BLU)
5
3
1
CN01
(BLK)
18
SW3
18
SW1
LED1
LED3
118
6
SW2
SW4
TBI.1
1310 12 14117465932 81
TBI.2
1310 12 14117465932 81
1
2
CN20
(RED)
TH1
1
4
THW1
1
2
1 3
IN2
IN7
IN6
IN5
IN4
IN3
IN1
t°t
°
THWB2
THWB1
THW8
t
°
THW6
t
°
THW7
t
°
THW9
t
°
Main
controller
1 2
THW2
THW5
CNW5
(WHT)
CNW12
(RED)
t
°
t°t°t
°
1
3
1
4
CN2F
(YLW)
CN20
(RED)
CN21
(YLW)
CNW12
(RED)
CNW5
(WHT)
1
2
1
2
CN108
1
3
13
13
CNBH
(WHT)
CNBHT
(BLK)
13
CNIH
(ORN)
CNBC
(GRY)
1
7
LED4
LED2
1
2
CN22
(BLU)
CNPWM
(WHT)
1
3
5
1
Wireless receiver
(Option)
CNRF
(WHT)
5
1
CN105
(RED)
CN2F
(YLW)
CN22
(BLU)
Table 2 Outputs
Name
Terminal block Connector
Item OFF ON
OUT1
TBO.1 3-4
CNP1
Water circulation pump 1 output (Space heating & DHW) OFF ON
OUT2
TBO.1 5-6
—
Water circulation pump 2 output (Space heating for Zone1) OFF ON
OUT3
TBO.1 7-8
—
Water circulation pump 3 output (Space heating for Zone2) OFF ON
OUT4
TBO.1 9-11
CNV1
3-way valve (2-way valve1) output Heating DHW
OUT5
TBO.1 12-13
—
Mixing valve output
Stop Close
TBO.1 13-14 Stop Open
OUT6
—
CNBH 1-3
Booster heater 1 output OFF ON
OUT7
—
CNBH 5-7
Booster heater 2 output OFF ON
OUT8
TBO.2 11-12
—
Booster heater 2+ output OFF ON
OUT9
TBO.2 9-10
CNIH
Immersion heater output OFF ON
OUT10
TBO.1 1-2
—
Boiler output OFF ON
OUT11
TBO.2 1-2
—
Error output Normal Error
OUT12
TBO.2 3-4
—
Defrost output Normal Defrost
OUT13
TBO.2 7-8
—
2-way valve 2 output DHW Heating
1. Symbols used in wiring diagram are,
: connector, : terminal block.
2. Indoor unit and outdoor unit connecting wires
have polarities, make sure to match terminal numbers
(S1, S2, S3) for correct wirings,
3. Since the outdoor unit side electric wiring may change,
be sure to check the outdoor unit electric wiring
diagram for servicing.
4. This diagram shows the wiring of indoor unit and
outdoor unit connecting wires (specification of 230V),
adopting superimposed system of power and signal.
When work to supply power separately to indoor
unit and outdoor unit was applied, refer to Figure 1.
21
6-9. EHPX-YM9B
OCH532A
Table 1 Signal Inputs
Name
Terminal block Connector
Item OFF (Open) ON (Short)
IN1 TBI.1 1-2
— Room thermostat 1 input
Refer to SW2-1 in <6-11 Dip switch setting>
IN2 TBI.1 3-4 CN2F
Flow switch 1 input
Refer to SW2-2 in <6-11 Dip switch setting>
IN3 TBI.1 5-6
— Flow switch 2 input (Zone1)
Refer to SW3-2 in <6-11 Dip switch setting>
IN4 TBI.1 7-8
— Demand control input
Normal
Heat source OFF/Boiler operation *2
IN5 TBI.1 9-10
— Outdoor thermostat input *1
Standard operation
Heater operation/Boiler operation *2
IN6 TBI.1 11-12
— Room thermostat 2 input
Refer to SW3-1 in <6-11 Dip switch setting>
IN7 TBI.1 13-14
— Flow switch 3 input (Zone2)
Refer to SW3-3 in <6-11 Dip switch setting>
*1. If using outdoor thermostat for controlling operation of heaters, the lifetime of the heaters and
related parts may be reduced.
*2. To turn on the boiler operation, use the main controller to select “Boiler” in “External/input setting“
screen in the service menu.
Symbol Name Symbol Name
TB1
Terminal block <Power supply, Outdoor unit>
TH1 Thermistor (Room temp.)(Option)
ECB1
Earth leakage circuit breaker for booster heater
TH2 Thermistor (Ref. liquid temp.)
MP1
Water circulation pump1(Space heating & DHW)
THW1 Thermistor (Flow water temp.)
MP2 Water circulation pump2
(Space heating for Zone1)(Field supply)
THW2 Thermistor (Return water temp.)
THW5 Thermistor (DHW tank water temp.)(Option)
MP3 Water circulation pump3
(Space heating for Zone2)(Field supply)
THW6 Thermistor (Zone1 flow temp.)(Option)
THW7 Thermistor (Zone1 return temp.)(Option)
3WV(2WV1)
3-way valve (2-way valve1)(Field supply) THW8 Thermistor (Zone2 flow temp.)(Option)
2WV2 2-way valve2 (Field supply) THW9 Thermistor (Zone2 return temp.)(Option)
MXV Mixing valve (Field supply)
THWB1
Thermistor (Boiler flow temp.)(Option)
BHT Thermostat for booster heater
THWB2
Thermistor (Boiler return temp.)(Option)
BHF Thermal fuse for booster heater IN1 Room thermostat 1 (Field supply)
BH1 Booster heater 1 IN2 Flow switch 1
BHC1 Contactor for booster heater 1 IN3 Flow switch 2 (Field supply)
BHCP Contactor for booster heater protection IN4 Demand control (Field supply)
IN5 Outdoor thermostat (Field supply)
IN6 Room thermostat 2 (Field supply)
IN7 Flow switch 3 (Field supply)
FLOW TEMP. CONTROLLER (FTC4)
TBO.1~2
Terminal block <Outputs>
TBI.1~2
Terminal block <Signal Inputs,Thermistor>
F1~F2
Fuse (T6.3AL250V)
SW1~4
Dip switch *See 6-11 Dip switch setting
X1~X12
Relay
LED1 Power supply (FTC4)
LED2 Power supply (Main controller)
LED3 Communication (FTC4-Outdoor unit)
LED4 Reading or writing data to SD card
CNPWM
Pump speed control signal for MP1
CN108
SD card connector
*
1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
2
3
4
5
6
7
8
9
10
11
12
13
14
2
2
1
3
5
7
X1
X2
X3
X4
X5A
X12
X11
X6
X8
X7
TBO.2
5
3
1
F1
F2
CN01
(BLK)
Signal
output
(Error)
Signal
output
(Defrost)
Signal
output
(Booster
heater2+)
MXV
M
1
~
M
1
~
MP2
M
1
~
MP3
MP1
M
1
~
2WV2
M
1
~
1
3
CNP1
(WHT)
1
3
1
3
Signal
output
(Boiler)
1
3
CNPWM
(WHT)
CNIH
(ORN)
2
1
3
CNBHT(BLK)
X5B
X10
CNBC
(GRY)
CNBH
(WHT)
TBO.1
X9
X13
Open
Close
N
3
Signal
output
(Immersion
heater)
91011
3WV
M
1
~
*
1
TBO.1
91011
2WV1
M
1
~
TBO.1
3WV 2WV1
2
22
ECB1
L
(1)N(3)
BHCP
BLU
BLU
RED
WHT/No.2
WHT/No.1
RED
VLT
VLT
GRY
GRY
BHC1
BHT
642
531
A1
A2
BH1
BHF
2
4
Power supply
to Booster heater
~/N 230V 50Hz
642
531
A1
A2
NL
S3S2S1
NL
S3S2S1
Figure 1
To outdoor
unit
TB1
ORN
ORN
YLW
BLK
BLK
YLW
GRN/YLW
To outdoor
unit
Power supply
~/N 230V 50Hz
TB1
ORN
BLU
RED
BLU
RED
YLW
GRN/YLW
1
3
CN3C
(BLU)
5
3
1
1
3
5
3
1
CN01
(BLK)
ORN
BRN
CN3C
(BLU)
CN01
(BLK)
ORN
ORN
BRN
YLW
Cylinder unit powered
by independent source.
Cylinder unit powered
via outdoor unit
CIRCUIT
BREAKER
TBO.1
3
9
5
1
7
2
8
4
6
11
10
12
13
14
TBO.2
FTC4
3
9
5
1
7
2
8
4
6
11
10
12
13
14
TBI.1
12610148
137119453
2
1
TBI.2
12610 148
13
7
11
9
4
5
321
13
CNP1(WHT)
1
5
CNV1
(WHT)
1
3
CN3C
(BLU)
5
3
1
CN01
(BLK)
18
SW3
18
SW1
LED1
LED3
118
6
SW2
SW4
TBI.1
1310 12 1411746593281
TBI.2
1310121411
74659
3
2
81
1
2
CN20
(RED)
TH1
1
3
CN21
(YLW)
TH2
1
4
THW1
1
2
1
3
IN2
IN7
IN6
IN5
IN4
IN3
IN1
t°t
°
THWB2
THWB1
THW8
t
°
THW6
t
°
THW7
t
°
THW9
t
°
Main
controller
1 2
THW2
THW5
CNW5
(WHT)
CNW12
(RED)
t°t°t°t°t
°
1
3
1
4
CN2F
(YLW)
CN20
(RED)
CN21
(YLW)
CNW12
(RED)
CNW5
(WHT)
1
2
1
2
CN108
1
3
13
13
CNBH
(WHT)
CNBHT
(BLK)
13
CNIH
(ORN)
CNBC
(GRY)
1
7
LED4
LED2
1
2
CN22
(BLU)
CNPWM
(WHT)
1
3
5
1
Wireless receiver
(Option)
CNRF
(WHT)
5
1
CN105
(RED)
CN2F
(YLW)
CN22
(BLU)
Table 2 Outputs
Name
Terminal block Connector
Item OFF ON
OUT1
TBO.1 3-4
CNP1
Water circulation pump 1 output (Space heating & DHW) OFF ON
OUT2
TBO.1 5-6
—
Water circulation pump 2 output (Space heating for Zone1) OFF ON
OUT3
TBO.1 7-8
—
Water circulation pump 3 output (Space heating for Zone2) OFF ON
OUT4
TBO.1 9-11
CNV1
3-way valve (2-way valve1) output Heating DHW
OUT5
TBO.1 12-13
—
Mixing valve output
Stop Close
TBO.1 13-14 Stop Open
OUT6
—
CNBH 1-3
Booster heater 1 output OFF ON
OUT7
—
CNBH 5-7
Booster heater 2 output OFF ON
OUT8
TBO.2 11-12
—
Booster heater 2+ output OFF ON
OUT9
TBO.2 9-10
CNIH
Immersion heater output OFF ON
OUT10
TBO.1 1-2
—
Boiler output OFF ON
OUT11
TBO.2 1-2
—
Error output Normal Error
OUT12
TBO.2 3-4
—
Defrost output Normal Defrost
OUT13
TBO.2 7-8
—
2-way valve 2 output DHW Heating
1. Symbols used in wiring diagram are,
: connector, : terminal block.
2. Indoor unit and outdoor unit connecting wires
have polarities, make sure to match terminal numbers
(S1, S2, S3) for correct wirings,
3. Since the outdoor unit side electric wiring may change,
be sure to check the outdoor unit electric wiring
diagram for servicing.
4. This diagram shows the wiring of indoor unit and
outdoor unit connecting wires (specification of 230V),
adopting superimposed system of power and signal.
When work to supply power separately to indoor
unit and outdoor unit was applied, refer to Figure 1.
22
6-10. ERSC-VM2B
OCH532A
23
Automatic switch to heat source only operation
Back-up heat source operation (*1) will automatically run when the outdoor unit stops abnormally.
To enable the function, switch Dip SW 2-5 to ON.
During the back-up operation, an error code(s) and the contact number will be displayed alternately.
External output (OUT11) will be available.
To clear the fault(s), reset the power breakers on the indoor and outdoor units.
<Applicable error codes (*2)>
E6 to E9, ED, P6, P8, U1 to U8, UD, UE, UF, UL, UP
(*1) Prolonged running of the back-up operation may affect the life of the heat source.
(*2) For safety reasons, this function is not available for certain faults. (System operation must be stopped and only pump keeps running.)
6-11. Dip switch setting
Located on the FTC4 printed circuit board are 4 sets of small white switches
known as Dip switches. The Dip switch number is printed on the circuit board
next to the relevant switches. The word ON is printed on the circuit board and on
the Dip switch block itself. To move the switch you will need to use a pin or the
corner of a thin metal ruler or similar.
Dip switch settings are listed in the table below.
Before changing any switch settings, ensure power supplies to indoor and outdoor units are isolated/powered off.
Dip switch Function OFF ON
Default settings:
Indoor unit model
SW1
SW1-1 Boiler WITHOUT Boiler WITH Boiler OFF
SW1-2 Heat pump maximum outlet water temperature 55ºC 60ºC ON *1
SW1-3 DHW tank WITHOUT DHW tank WITH DHW tank OFF
SW1-4 Immersion heater WITHOUT Immersion heater WITH Immersion heater OFF
SW1-5 Booster heater WITHOUT Booster heater WITH Booster heater ON
SW1-6 Booster heater function For heating only For heating and DHW ON
SW1-7 Outdoor unit type Split type Packaged type
OFF: E*SC-*M*B
ON : EHPX-*M*B
SW1-8 Wireless remote controller WITHOUT Wireless remote controller WITH Wireless remote controller OFF
SW2
SW2-1 Room thermostat1 input (IN1) logic change
Zone1 operation stop at thermostat short Zone1 operation stop at thermostat open
OFF
SW2-2 Flow switch1 input (IN2) logic change Failure detection at short Failure detection at open ON
SW2-3 Booster heater capacity restriction Inactive Active
OFF: Except
E***-VM2B
ON : E***-VM2B
SW2-4 Cooling mode function Inactive Active
OFF: Except
ERSC-VM2B
ON : ERSC-VM2B
SW2-5
Automatic switch to backup heat source operation
(When outdoor unit stops by error)
Inactive Active *2 OFF
SW2-6 Mixing tank WITHOUT Mixing tank WITH Mixing tank OFF
SW2-7 2-zone temperature control Inactive Active OFF
SW2-8 — — - OFF
SW3
SW3-1 Room thermostat 2 input (IN6) logic change
Zone2 operation stop at thermostat short Zone2 operation stop at thermostat open
OFF
SW3-2 Flow switch 2 input (IN3) logic change Failure detection at short Failure detection at open OFF
SW3-3 Flow switch 3 input (IN7) logic change Failure detection at short Failure detection at open OFF
SW3-4 Cooling operation in Zone2 Not in use In use OFF
SW3-5 Heating mode function *3 Inactive Active OFF
SW3-6 — — — OFF
SW3-7 — — — OFF
SW3-8 — — — OFF
SW4
SW4-1 Multiple outdoor units control Inactive Active OFF
SW4-2 Position of multiple outdoor units control *4 Slave Master OFF
SW4-3 LED3 display Indoor-outdoor communication Refrigerant address OFF
SW4-4 — — — OFF
SW4-5 Emergency mode (Heater only operation) Normal
"Emergency mode (Heater only operation)
(To be activated only when powered ON)"
OFF *5
SW4-6 Emergency mode (Boiler operation) Normal
"Emergency mode (Boiler operation)
(To be activated only when powered ON)"
OFF *5
Note: 1.
When the hydrobox is connected with a PUHZ-RP outdoor unit of which maximum outlet water temperature is 55ºC, Dip SW1-2 must be changed to OFF.
2. OUT11 will be available. For safety reasons, this function is not available for certain errors. (In that case, system operation must be stopped
and only the water circulation pump keeps running.)
3 This switch functions only when the hydrobox is connected with a PUHZ-FRP outdoor unit. When another type of outdoor unit is connected,
the heating mode function is active regardless of the fact that this switch is ON or OFF.
4. SW4-2 is available only when SW4-1 is ON.
5. If emergency mode is no longer required, return the switch to OFF position.
SW1
SW4
SW2
SW3
OCH532A
24
FIELD WIRING
7
L
N
S1
S2
S3
S1
S2
S3
TB1
L
N
ECB1
L
N
Earth
leakage
circuit
breaker
*1
Outdoor unit
Power
supply
~/N
230V
50Hz
Wiring
circuit
breaker or
Isolating
switch
To control
board
For
booster
heater
(Primary circuit)
Hydrobox
Wiring
circuit
breaker or
Isolating
switch
Power
supply
~/N
230V
50Hz
Option 1: Hydrobox powered via outdoor unit
<1 phase>
<Figure 7-1>
Electrical connections 1 phase
Description Power supply Capacity Breaker Wiring
Booster heater (Primary circuit) ~/N 230 V 50 Hz 2 kW 16 A *1 2.5 mm²
6 kW 32 A *1 6.0 mm²
Wiring
Wiring No.
× size (mm²)
Hydrobox - Outdoor unit *2 3 × 1.5 (polar)
Hydrobox - Outdoor unit earth *2 1 × Min. 1.5
Circuit
rating
Hydrobox - Outdoor unit S1 - S2 *3 230V AC
Hydrobox - Outdoor unit S2 - S3 *3 24V DC
*1. A breaker with at least 3.0 mm contact separation in each pole shall be provided. Use earth leakage breaker (NV).
The breaker shall be provided to ensure disconnection of all active phase conductors of the supply.
*2. Max. 45 m
If 2.5 mm² used, Max. 50 m
If 2.5 mm² used and S3 separated, Max. 80 m
*3. The values given in the table above are not always measured against the ground value.
Notes: 1. Wiring size must comply with the applicable local and national codes.
2. Indoor unit/outdoor unit connecting cords shall not be lighter than polychloroprene sheathed fl exible cord. (Design 60245 IEC 57)
Indoor unit power supply cords shall not be lighter than polychloroprene sheathed fl exible cord. (Design 60227 IEC 53)
3. Install an earth longer than other cables.
4. Please keep enough output capacity of power supply for each heater. Insuffi cient power supply capacity might cause chattering.
*1 If the installed earth leakage circuit breaker does not have an over-current protection function, install a breaker with that function along the same
power line.
*2 Affi x label A which is included with the manuals near each wiring diagram for hydrobox and outdoor units.
Breaker abbreviation Meaning
ECB1 Earth leakage circuit breaker for booster heater
TB1 Terminal block 1
OCH532A
25
L1
L2
S1
S2
S3
S1
S2
S3
TB1
L2
L3
ECB1
N
L3
L1
L2
L1
Earth
leakage
circuit
breaker
*1
Outdoor unit
Wiring
circuit
breaker or
Isolating
switch
To control
board
For
booster
heater
(Primary circuit)
Hydrobox
Wiring
circuit
breaker or
Isolating
switch
Power
supply
3N~
400V
50Hz
<3 phase>
<Figure 7-2>
Electrical connections 3 phase
Description Power supply Capacity Breaker Wiring
Booster heater (Primary circuit)
3~ 400 V 50 Hz 9 kW 16 A *1 2.5 mm²
3~ 230 V 50 Hz 9 kW 32 A *1 6.0 mm²
Wiring
Wiring No.
× size (mm²)
Hydrobox - Outdoor unit *2 3 × 1.5 (polar)
Hydrobox - Outdoor unit earth *2 1 × Min. 1.5
Circuit
rating
Hydrobox - Outdoor unit S1 - S2 *3 230V AC
Hydrobox - Outdoor unit S2 - S3 *3 24V DC
*1. A breaker with at least 3.0 mm contact separation in each pole shall be provided. Use earth leakage breaker (NV).
The breaker shall be provided to ensure disconnection of all active phase conductors of the supply.
*2. Max. 45 m
If 2.5 mm² used, Max. 50 m
If 2.5 mm² used and S3 separated, Max. 80 m
*3. The values given in the table above are not always measured against the ground value.
Notes: 1. Wiring size must comply with the applicable local and national codes.
2. Indoor unit/outdoor unit connecting cords shall not be lighter than polychloroprene sheathed fl exible cord. (Design 60245 IEC 57)
Indoor unit power supply cords shall not be lighter than polychloroprene sheathed fl exible cord. (Design 60227 IEC 53)
3. Install an earth longer than other cables.
4. Please keep enough output capacity of power supply for each heater. Insuffi cient power supply capacity might cause chattering.
*1 If the installed earth leakage circuit breaker does not have an over-current protection function, install a breaker with that function along the same
power line.
*2 Affi x label A which is included with the manuals near each wiring diagram for hydrobox and outdoor units.
Power supply
3~ 400 V 50 Hz (EH**-YM9(E)B)
3~ 230 V 50 Hz (EHSC-TM9B)
OCH532A
26
L
N
S1
S2
S3
S1
S2
S3
TB1
L
N
ECB1
L
N
For
booster
heater
(Primary circuit)
To control
board
Outdoor unit
Wiring
circuit
breaker or
Isolating
switch
Earth
leakage
circuit
breaker
*1
Power
supply
~/N
230V
50Hz
Power
supply
~/N
230V
50Hz
Earth
leakage
circuit
breaker
*1
Wiring
circuit
breaker or
Isolating
switch
Wiring
circuit
breaker or
Isolating
switch
Power
supply
~/N
230V
50Hz
Hydrobox
Option2: Hydrobox powered by independent source
If the hydrobox and outdoor units have separate power supplies, the following
requirements MUST be carried out:
• Change connector connections in hydrobox control and electrical box
(see Figure 7-3).
• Turn the outdoor unit DIP switch SW8-3 to ON.
• Turn on the outdoor unit BEFORE the hydrobox.
<1 phase>
<Figure 7-4>
Electrical connections 1 phase
<Figure 7-3>
Description Power supply Capacity Breaker Wiring
Booster heater (Primary circuit) ~/N 230 V 50 Hz 2 kW 16 A *1 2.5 mm²
6 kW 32 A *1 6.0 mm²
Hydrobox power supply ~/N 230 V 50 Hz
Hydrobox input capacity
Main switch (Breaker)
*1
16 A
Wiring
Wiring No.
× size (mm²)
Hydrobox power supply 2 × Min. 1.5
Hydrobox power supply earth 1 × Min. 1.5
Hydrobox - Outdoor unit *2 2 × Min. 0.3
Hydrobox - Outdoor unit earth —
Circuit
rating
Hydrobox L - N *3 230V AC
Hydrobox - Outdoor unit S1 - S2 *3 —
Hydrobox - Outdoor unit S2 - S3 *3 24V DC
*1. A breaker with at least 3.0 mm contact separation in each pole shall be provided. Use earth leakage breaker (NV).
The breaker shall be provided to ensure disconnection of all active phase conductors of the supply.
*2. Max. 120 m
*3. The values given in the table above are not always measured against the ground value.
Notes: 1. Wiring size must comply with the applicable local and national codes.
2. Indoor unit/outdoor unit connecting cords shall not be lighter than polychloroprene sheathed fl exible cord. (Design 60245 IEC 57)
Indoor unit power supply cords shall not be lighter than polychloroprene sheathed fl exible cord. (Design 60227 IEC 53)
3. Install an earth longer than other cables.
4. Please keep enough output capacity of power supply for each heater. Insuffi cient power supply capacity might cause chattering.
*1 If the installed earth leakage circuit breaker does not have an over-current protection function, install a breaker with that function along the same
power line.
*2 Affi x label B which is included with the manuals near each wiring diagram for hydrobox and outdoor units.
S1
S2
S3
L
N
L
N
CN01
CN01
CN01
CN01
S1
S2
S3
Initial settings
(Power supplied
by outdoor unit)
Modifi ed settings
(Separate power
supply to
the hydrobox)
BLACK
BLACK
YELLOW
BLACK
YELLOW
YELLOW
YELLOW
BLACK
Hydrobox
control board
Black
Black
Hydrobox
control board
OCH532A
27
L1
L2
S1
S2
S3
S1
S2
S3
TB1
L2
L3
ECB1
N
L3
L1
L
N
Earth
leakage
circuit
breaker
*1
Outdoor unit
Power
supply
3N~
400V
50Hz
Wiring
circuit
breaker or
Isolating
switch
To control
board
For
booster
heater
(Primary circuit)
Hydrobox
Wiring
circuit
breaker or
Isolating
switch
Power
supply
~/N
230V
50Hz
Earth
leakage
circuit
breaker
*1
Wiring
circuit
breaker or
Isolating
switch
<3 phase>
<Figure 7-5>
Electrical connections 3 phase
Description Power supply Capacity Breaker Wiring
Booster heater (Primary circuit) 3~ 400 V 50 Hz 9 kW 16 A *1 2.5 mm²
3~ 230 V 50 Hz 9 kW 32 A *1 6.0 mm²
Hydrobox power supply ~/N 230 V 50 Hz
Hydrobox input capacity
Main switch (Breaker)
*1
16 A
Wiring
Wiring No.
× size (mm²)
Hydrobox power supply 2 × Min. 1.5
Hydrobox power supply earth 1 × Min. 1.5
Hydrobox - Outdoor unit *2 2 × Min. 0.3
Hydrobox - Outdoor unit earth —
Circuit
rating
Hydrobox L - N *3 230V AC
Hydrobox - Outdoor unit S1 - S2 *3 —
Hydrobox - Outdoor unit S2 - S3 *3 24V DC
*1. A breaker with at least 3.0 mm contact separation in each pole shall be provided. Use earth leakage breaker (NV).
The breaker shall be provided to ensure disconnection of all active phase conductors of the supply.
*2. Max. 120 m
*3. The values given in the table above are not always measured against the ground value.
Notes: 1. Wiring size must comply with the applicable local and national codes.
2. Indoor unit/outdoor unit connecting cords shall not be lighter than polychloroprene sheathed fl exible cord. (Design 60245 IEC 57)
Indoor unit power supply cords shall not be lighter than polychloroprene sheathed fl exible cord. (Design 60227 IEC 53)
3. Install an earth longer than other cables.
4. Please keep enough output capacity of power supply for each heater. Insuffi cient power supply capacity might cause chattering.
*1 If the installed earth leakage circuit breaker does not have an over-current protection function, install a breaker with that function along the same power line.
*2 Affi x label B which is included with the manuals near each wiring diagram for hydrobox and outdoor units.
Power supply
3~ 400 V 50 Hz (EH**-YM9(E)B)
3~ 230 V 50 Hz (EHSC-TM9B)
OCH532A
28
WATER SYSTEM DIAGRAM
8
Note
• Be sure to follow your local regulations to perform system confi guration of the DHW connec-
tions.
• DHW connections are not included in the hydrobox package. All required parts are to be
sourced locally.
• To enable draining of the hydrobox an isolating
valve should be positioned on both the inlet and
outlet pipework.
• Be sure to install a strainer, on the inlet pipe
work to the hydrobox.
• Suitable drain pipework should be attached to
all relief valves in accordance with your country's regulations.
• A backfl ow prevention device must be installed
on water supply pipework (IEC 61770).
• When using components made from different
metals or connecting pipes made of different
metals insulate the joints to prevent a corrosive
reaction taking place which will damage the
pipework.
Pa
16
B
21
23
20
22
23
24
24
3
4
5
6
7
8
9
10
11
12
13
14
18
19
25
1
1
7
24
26
26
24
Pa
16
B
A
17
20
23
21
22
23
24
24
3
4
15
2
1
5
6
7
8
9
10
11
12
13
14
18
19
25
<EHSC> (Split model system)
<ERSC> (Split model system for heating and cooling)
Hydrobox
Drain
Local
system *1
Water
supply
Drain
Cold
water
DHW
A. Refrigerant pipe
B. Water pipe
1. Plate heat exchanger
2. Flexible hose
3. Booster heater 1,2
4. Drain cock (booster heater)
5. Pump valve
6. Water circulation pump 1
7. Manometer
8. Pressure relief valve
9. Automatic air vent
10. Expansion vessel (except EHSC-*M*EB)
11. Strainer valve
12. Flow switch
13. THW1
14. THW2
15. TH2
16. THW5 (optional part PAC-TH011TK-E)
17. Outdoor unit
18. Drain pipe (fi eld supply)
19. 3-way valve (fi eld supply)
20. DHW indirect unvented tank (fi eld supply)
21. Cold water inlet pipe (fi eld supply)
22. DHW outlet connection (fi eld supply)
23. Back fl ow prevention device (fi eld supply)
24. Isolating valve (fi eld supply)
25. Magnetic fi lter is recommended (fi eld supply).
26. Strainer (fi eld supply)
*1 Refer to page 29.
Hydrobox
Cold
water
DHW
Local
system *1
Water
supply
Drain
<EHPX> (Packaged model system)
OCH532A
29
1-zone temperature control
1
2-zone temperature control
3
㪎
5
2
4
6
8
9
㪈㪇
㪈㪈
1
12
1
5
4
3
6
2
13
14
15
2
13
14
15
7
5
4
3
6
1
8
9
10
11
12
1-zone temperature control with boiler 2-zone temperature control with boiler
Local system
1
2
3
5
6
4
Zone1
Zone1
Zone1
Zone2
Zone1
Zone1
Zone2
* Flow switch specifi cations: DC13 V / 0.1 mA / Both normally-open and normally-closed types can be used. (Set Dip switch 3 to select the logics. Refer to
“ 6-11. Dip switch setting”.)
Note
• Two different fl ow temperatures are NOT available in Cooing mode. The fl ow temperature for Zone2 during Cooling mode is controlled to be the same
temperature as that for Zone1.
• The water circuit for Zone2 can be closed during Cooling mode using dip switch 3-4.
1. Zone1 heat emitters (e.g. radiator, fan coil unit) (fi eld supply)
2. Mixing tank (fi eld supply)
3. Zone1 fl ow water temp. thermistor (THW6)
4. Zone1 return water temp. thermistor (THW7)
5. Zone1 water circulation pump (fi eld supply)
6. Zone1 fl ow switch (fi eld supply) *
7. Motorized mixing valve (fi eld supply)
8. Zone2 fl ow water temp. thermistor (THW8)
9. Zone2 return water temp. thermistor (THW9)
10. Zone2 water circulation pump (fi eld supply)
11. Zone2 fl ow switch (fi eld supply) *
12. Zone2 heat emitters (e.g. underfl oor heating) (fi eld supply)
13. Boiler fl ow water temp. thermistor (THWB1)
14. Boiler return water temp. thermistor (THWB2)
15. Boiler
Optional part : PAC-TH011-E
Optional part : PAC-TH011-E
Optional part : PAC-TH011HT-E
OCH532A
30
1. Check all connections including factory fi tted ones are tight.
2. Insulate pipe work between hydrobox and outdoor unit.
3. Thoroughly clean and fl ush, system of all debris. (Refer to 4.2 in the installation manual.)
4. Fill primary heating circuit with water and suitable anti-freeze and inhibitor as necessary. Always use a fi lling loop with double check valve when fi lling the
primary circuit to avoid back fl ow contamination of water supply.
Anti-freeze should always be used for package systems. It is the responsibility of the installer to decide if anti-freeze solution should be used in split systems
depending on each site’s conditions. Corrosion inhibitor should be used in both split and package systems.
When connecting metal pipes of different materials insulate the joints to prevent a corrosive reaction taking place which will damage the pipework.
•
•
5. Check for leaks. If leaks are found, retighten the screws on the connections.
6. Pressurise system to 1 bar.
7. Release all trapped air using air vents during and following heating period.
8. Top up with water as necessary. (If pressure falls below 1 bar)
Filling the System (Primary Circuit)
Draining the Hydrobox
WARNING: DRAINED WATER MAY BE VERY HOT
1. Before attempting to drain the hydrobox islolate from the electrical supply to prevent booster heater burning out.
2. Isolate hydrobox from primary water circuit and drain water from hydrobox. Use a suitable heat resistant hose to assist in these operations.
3. Drain any remaining water from booster heater using fi tted drain cock and hose, and the drain valve on the primary circuit to safely drain the unit.
4. After the hydrobox is drained, water remains in the following component parts. Drain water completely by checking the inside of the parts.
• Strainer (Remove the strainer cover.)
• Pressure relief valve (Operate the valve.)
OCH532A
31
CONTROLS
9
9-1. Main Controller
F1 F2 F3 F4
<Main controller parts>
Letter Name Function
A Screen Screen in which all information is displayed
B Menu Access to system settings for initial set up and
modifi cations.
C Back Return to previous menu.
D Confi rm Used to select or save. (Enter key)
E Power/Holiday If system is switched off pressing once will turn
system on. Pressing again when system is
switched on will enable Holiday Mode. Holding the
button down for 3 secs will turn the system off. (*1)
F1-4 Function keys Used to scroll through menu and adjust settings.
Function is determined by the menu screen visible
on screen A.
*1
When the system is switched off or the power supply is disconnected, the
hydrobox protection functions (e.g. freeze stat. function) will NOT operate.
Please beware that without these safety functions enabled the hydrobox
may potentially become exposed to damage.
<Main screen icons>
Icon Description
1 Legionella
prevention
When this icon is displayed ‘Legionella prevention
mode’ is active.
2 Heat pump
‘Heat pump’ is running
Defrosting
Emergency heating
3 Electric heater When this icon is displayed the ‘Electric heaters’
(booster or immersion heater) are in use.
4 Target
temperature
Target fl ow temperature
Target room temperature
Compensation curve
5 OPTION Pressing the function button below this icon will dis-
play the quick view menu.
6 + Increase desired temperature.
7 - Decrease desired temperature.
8Z1
Z2 Pressing the function button below this icon switch-
es between Zone1 and Zone2.
Information Pressing the function button below this icon displays
the information screen.
9 Space heating
(cooling) mode
Heating mode
Zone1 or Zone2
Cooling mode
10 DHW mode Normal or ECO mode
11 Holiday mode
When this icon is displayed ‘Holiday mode’ activated.
12
Timer
Prohibited
Stand-by
Stop
Operating
13
Current
temperature
Current room temperature
Current water temperature of DHW tank
14
The Menu button is locked or the switching of the
operation modes between DHW and Heating opera-
tions are disabled in the Option screen.
15
SD memory card is inserted. Normal operation.
SD memory card is inserted. Abnormal operation.
BCD
E
A
12 11
132
10
9
4
7
65
15 14
13
8
OCH532A
32
Continued to next page.
F3 (PREVIEW)
F4 (EDIT)
F2, F3
F4
F1
F2
F3 (EDIT)
F1
F4
F1
F2
F3
F4
F1 (Zone1)
F2 (Zone2)
F2, F3
F4
*1 When a PUHZ-FRP outdoor unit is connected.
Unrestricted access
Installer only
Shaded items relate
to DHW functions.
These are only available if the system
includes a DHW tank.
<Main Controller Menu Tree>
Initial
Main screen
Information
Option
Forced DHW ON/OFF
DHW ON/Prohibited/Timer
Heating/Cooling ON/Prohibited/Timer
Holiday Active/Non active
Set time
Main menu
DHW Normal/Eco
Edit
DHW max. temp.
DHW max. temp. drop
DHW max. operation time
DHW mode restriction
Legionella Active/Non active
Edit
Hot water temp.
Frequency
Start time
Max. operation time
Duration of max. temp.
Heating/cooling mode Zone1
Heating room temp./Heating fl ow temp./
Heating compensation curve/Cooling
fl ow temp.
Zone2 Room temp./Flow temp. /
Compensation curve
Compensation curve preview
Compensation curve edit Zone1
Curve parameters
Adjustment
Zone2
Curve parameters
Adjustment
Schedule timer menu
Heating Zone1 Schedule timer preview
Day select Time select
Time setting
Temp. setting
Zone2 Schedule timer preview
Day select Time select
Time setting
Temp. setting
Cooling Schedule timer preview
Day select Time select
Time setting
DHW Schedule timer preview
Day select
Time setting
Time setting
DHW 2
*1
Period Schedule timer preview
Day select
Time setting
Time setting
Holiday mode
DHW active /non active
Heating/Cooling active/non active
Holiday menu Zone1
Heating room temp.
Heating fl ow temp.
Cooling fl ow temp.
Zone2
Heating room temp.
Heating fl ow temp.
Initial settings
Date/Time yyyy/mm/dd/hh:mm
Language ENG/FR/GER/SW/SP/IT/DA/NL/FIN/NOR/PT
°C/°F °C/°F
Temp. display OFF/Room/Tank/Room&Tank
Contact number
Time display hh:mm/hh:mm AM/AM hh:mm
Room sensor setting
Room RC zone select Room RC1-8
Sensor setting Zone1 Sensor setting TH1/Main controller/
Room RC1-8/ “Time/Zone”
Select
Time/Zone
Time setting
Sensor setting
Zone2 Sensor setting TH1/Main controller/
Room RC1-8/ “Time/Zone”
Select
Time/Zone
Time setting
Sensor setting
OCH532A
33
<Main Controller Menu Tree>
Initial
Main screen
Main menu Service
Manual operation
Function settings
Thermistor adjustment
Auxiliary settings
Economy setting for pump
ON/OFF
Delay
Electric heater (Heating)
ON/OFF
Delay
Electric heater (DHW)
ON/OFF
Delay
Mixing valve control Running
Interval
Pump speed
Heat source setting Standard (Heat pump & electric heater)/Heater (Electric heater only)/Boiler/Hybrid (Heat pump
& heater/Boiler)
Operation settings Freeze stat function Flow t.
Outdoor ambient temp.
Simultaneous operation ON/OFF
Outdoor ambient temp.
Cold weather function ON/OFF
Outdoor ambient temp.
Room temp. control (Heating)
Temp. control interval
Flow temp. range Min. temp.
Max. temp.
H/P thermo diff. adjust ON/OFF
Lower limit
Upper limit
Boiler settings Hybrid settings Outdoor ambient temp.
*2 Priority Ambient/Cost /CO2
Intelligent settings Energy price Electricity
Boiler
Schedule
CO2 emission
Electricity
Boiler
Heat source
Heat pump capacity
Boiler effi ciency
Booster heater 1
capacity
Booster heater 2
capacity
Floor dry up function ON/OFF
(For more details,
refer to
Page 39.)
Target temp. Start & Finish
Max. temp.
Max. temp. period
Flow temp. (Increase) Temp. increase step
Increase interval
Flow temp. (Decrease) Temp. decrease step
Decrease interval
External input settings Demand control OFF (Heat source)/Boiler
Running information Outdoor thermostat Heater/Boiler
Thermistor reading
Summary of settings
Error history
Password protection
Manual reset
Main controller
Yes/No
FTC Yes/No
SD card SD
Main RC
Main RC SD
(Password protected)
Unrestricted access
Installer only
Shaded items relate
to DHW functions.
These are only available if the system
includes a DHW tank.
Continued from the previous page.
*2 For more details, refer to the installation manual of PAC-TH011HT-E.
OCH532A
34
Screen 1 of service menu
Screen 2 of service menu
System off prompt screen
Manual operation menu screen
System off prompt screen
Being selected
Being running
Error indication
9-2. Service Menu
The service menu provides functions for use by installer or service engineer. It is
NOT intended the home owner alters settings within this menu. It is for this
reason password protection is required to prevent unauthorised access to the
service settings.
From the main setting menu use F2 and F3 to highlight the service icon then
press CONFIRM.
You will be prompted to enter a password. THE FACTORY DEFAULT
PASSWORD IS “0000”.
Press CONFIRM.
(It takes approx. 30 secs to load the service menu.)
The service menu is navigated using the F1 and F2 buttons to scroll through the
functions. The menu is split across three screens and is comprised of the following
functions;
Manual operation
Function settings
Thermistor adjustment
Auxiliary settings
Heat source setting
Operation settings
External input settings
Running information
Thermistor reading
Summary of settings
Error history
Password protection
Manual reset
SD card
1.
2.
3.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
Note: Many functions can not be set whilst the indoor unit is running. The
installer should turn OFF the unit before trying to set these functions.
If the installer attempts to change the settings whilst the unit is
running the main controller will display a reminder message
prompting the installer to stop operation before continuing. By
selecting “Yes” the unit will cease operation.
Manual operation
During the fi lling of the system the water circulation pump and 3-way valve
(2-way valve 1), and mixing valve can be manually overridden using manual
operation mode.
When manual operation is selected a small timer icon appears in the screen. The
function selected will only remain in manual operation for a maximum of 2 hours.
This is to prevent accidental permanent override of the FTC4.
From the service menu use F1 and F2 buttons to scroll through list until
Manual Operation is highlighted.
Press CONFIRM.
Manual operation menu screen is displayed.
To activate manual operation press the function button under the desired part.
►Example
Pressing F3 button will switch manual operation mode ON for the main 3-way
valve. When fi lling of the DHW tank is complete the installer should access this
menu again and press F3 to deactivate manual operation of the part. Alternatively
after 2 hours manual operation mode will no longer be active and FTC4 will
resume control of the part.
NOTE: Manual operation and heat source setting can not be selected if the
system is running. A screen will be displayed asking the installer to
stop the system before these modes can be activated.
The system automatically stops 2 hours after last operation.
The OUT13 output of the 2-way valve 2 constitutes an inversion of
the OUT4 output of the 2-way valve 1.
1.
2.
3.
4.
OCH532A
35
Auxiliary settings menu screen
Economy settings for pump screen
Function settings
Function Setting allows the setting of auto recovery after power failure only.
1. From the service menu use F1 and F2 to highlight Function Setting.
2. Press CONFIRM.
3. Ensure the Ref address and unit number are displayed to the right.
4. Press CONFIRM.
5. Use F3 and F4 to highlight either 1/2/3 (see below).
Note: Changes can ONLY be made to Mode 1.
6. Press CONFIRM.
Mode 1 Setting number meanings
1 - Power failure automatic recovery NOT available
2 - Power failure automatic recovery AVAILABLE
(Approx 4-minute delay after power is restored.)
3 - NO FUNCTION
Thermistor adjustment
This function allows adjustments to be made to the thermistor readings from
-10 – 10 °C in 0.5 °C intervals.
1. From the Service menu highlight Thermistor Adjustment
2. Press CONFIRM.
3. Use F1 and F2 to select thermistor.
4. Press CONFIRM.
5. Use F2 and F3 to change the thermistor temperature.
6. Press CONFIRM.
Auxiliary settings
This function is used to set the parameters for any auxiliary parts used in the
system.
From the service menu use F1 and F2 buttons to highlight Auxiliary settings then
press CONFIRM.
<Economy settings for pump>
From the Auxiliary settings menu highlight Economy Settings for water
circulation pump.
Press CONFIRM.
The economy settings for water circulation pump screen is displayed.
Use button F1 to switch the economy settings ON/OFF.
Use buttons F3 and F4 to adjust the time the water circulation pump will run.
(3 - 60 mins)
1.
2.
3.
4.
5.
OCH532A
36
Electric heater (Heating) screen
Electric heater (DHW) screen
<Mixing valve control>
From the Auxiliary settings menu highlight Mixing valve control.
Press CONFIRM.
The Mixing valve control screen is displayed.
Use F1 and F2 buttons to set Running time between 10 to 240 seconds. The
Running time equals to a period from full open of the valve (at a hot water
mixing ratio of 100%) to full close (at a cold water mixing ratio of 100%).
Note: Set the Running time according to the specifications of the actuator
of each mixing valve.
From the Auxiliary settings menu highlight Mixing valve control.
Press CONFIRM.
The Mixing valve control screen is displayed.
Press F3 and F4 buttons to set the interval between 2-zone temperature
controls of the mixing valve between 1 to 30 mins.
Note: It is recommended to set the interval to 2 minutes that is a default
value. With the interval set longer, it could take longer to warm up a
room.
1.
2.
3.
4.
1.
2.
3.
4.
Mixing valve setting screen
Pump speed setting screen
<Pump speed>
From the Auxiliary settings menu highlight water circulation pump speed.
Press CONFIRM.
Press F3 and F4 buttons to select a refrigerant address of which you wish to
confi gure or check the settings, and press CONFIRM. *1
The Pump speed screen is displayed.
Use F2 and F3 buttons to set the pump speed of the water circulation pump
between 1 and 5.
*1 For multiple outdoor units control system only.
1.
2.
3.
4.
5.
<Electric heater (Heating)>
From the Auxiliary settings menu highlight Electric heater (Heating).
Press CONFIRM.
The Electric heater (Heating) screen is displayed.
Press F1 button to switch the function ON/OFF.
Use F3 and F4 buttons to adjust the time period of heat pump only operation
before the booster heater will assist in space heating. (5 -180mins)
1.
2.
3.
4.
5.
<Electric heater (DHW)>
From the Auxiliary settings menu highlight Electric heater (DHW).
Press CONFIRM.
The Electric heater (DHW) screen is displayed.
Press F1 button to switch the function ON/OFF.
Use F3 and F4 buttons to adjust the time period of heat pump only operation
before the booster heater and the immersion heater (if present) will assist in
DHW heating. (15 -30mins)
1.
2.
3.
4.
5.
OCH532A
37
Heat source setting screen
Cancel last action screen
Operation settings
To access the Operation settings menu use F1 and F2 buttons to scroll
through the service menu until Operation settings is highlighted.
Press CONFIRM.
Operation settings menu is displayed.
1.
2.
3.
<Freeze stat function>
From the Auxiliary settings menu highlight Freeze Stat Function.
Press CONFIRM.
The freeze stat function screen will be displayed.
Use buttons F3 and F4 to adjust the minimum outdoor ambient temperature at
which freeze stat function will begin to operate, (3 - 20 °C) or choose
.
If asterisk ( ) is chosen freeze stat function is deactivated. (i.e. primary water
freeze risk)
Note: When the system is turned off, freeze stat function is not enabled.
1.
2.
3.
4.
Operation settings menu screen
Simultaneous operation screen
Freeze stat function screen
<Simultaneous Operation>
For periods of very low outside temperature this mode can be used.
Simultaneous operation allows both DHW and space heating to run together by
using the heat pump and/or booster heater to provide space heating whilst only
the immersion heater provides heating for DHW. This operation is only available
if BOTH a DHW tank AND immersion heater are present on the system.
From the Operation settings menu use F1 and F2 buttons to scroll through the
list until Simultaneous operation is highlighted.
Press CONFIRM.
Simultaneous operation screen is displayed.
To switch simultaneous operation ON/OFF press F1.
To alter the temperature at which simultaneous operation starts use F3 and F4.
Note:
Range of outdoor ambient temperature is −15°C to 10°C (default −15°C).
System shall automatically return to routine operation. This will happen
when the outdoor ambient temp rises above the selected temp for this
specifi c mode of operation.
1.
2.
3.
4.
5.
•
•
Heat source setting
The default heat source setting is heat pump and all electric heaters present in
the system to be operational. This is referred to as Standard operation on the
menu.
From the service menu use F1 and F2 buttons to scroll through list until
Heat
Source Setting is highlighted.
Press CONFIRM.
Heat source setting menu screen is displayed.
Press F3 button until preferred heat source is displayed.
Press CONFIRM.
1.
2.
3.
4.
5.
If you wish to return to the service menu without saving the setting press return
button. You will be asked if you are sure you wish to cancel the changes.
Choose Yes or No as appropriate.
6.
OCH532A
38
Cold weather function screen
<Cold weather function>
For extremely low outdoor ambient temperature conditions when the heat pump’s
capacity is restricted the heating or DHW is provided only by the electric booster
heater (and immersion if present). This function is intended for use during
extreme cold periods only. Extensive use of direct electrical heaters ONLY will
result in higher electric usage and may reduce working life of heaters and related
parts.
From the Operation settings menu use F1 and F2 buttons to scroll through the
list until Cold weather function is highlighted.
Press CONFIRM.
Cold weather function screen is displayed.
To switch Cold weather function ON/OFF press F1.
To alter the temperature at which heater switching function starts use F3 and
F4.
Note:
Range of outdoor ambient temperature is −15°C to −10°C (default −15°C).
System shall automatically return to routine operation. This will happen
when the outdoor ambient temp rises above the selected temp for this
specifi c mode of operation.
1.
2.
3.
4.
5.
•
•
<Room Temp Control (Heating)>
This function allows operational setting of fl ow temperature range from the Ecodan and
also the time interval at which the FTC4 collects and processes data for the auto adaptation mode.
From the Operation settings menu use F1 and F2 buttons to scroll through the list
until Room temp. control (Heating) is highlighted.
Press CONFIRM.
3. Use F1 and F2 keys to scroll through the menu selecting each subtitle in turn by
pressing CONFIRM. See the table below for description of each setting.
4. Enter the desired number using the function keys and press CONFIRM.
1.
2.
Room temp. control (Heating) screen
Menu subtitle Function Range Unit Default
Temp. control interval Selectable according to the heat emitter type and the mate-
rials of fl oor (i.e. radiators, fl oor heating-thick, -thin concrete,
wood, etc.)
10 - 60 mins. 10
Flow temperature range Minimum temp. To minimize the loss by frequent ON and OFF in mild out-
door ambient temp. seasons.
25 - 45 ºC 30
Maximum temp. To set max. possible fl ow temp according to the type of heat
emitters.
35 - 60 ºC 50
Heat pump thermo diff.adjust On/Off To minimize the loss by frequent ON and OFF in mild out-
door ambient temp. seasons.
On/Off — On
Lower limit Prohibits heat pump operation until the flow temperature
drops below the target fl ow temperature minus lower limit
value.
−9 - −1ºC −5
Upper limit Allows heat pump operation until the fl ow temperature rises
above the target fl ow temperature plus upper limit value.
+3 - +5 ºC +5
*1 The minimum fl ow temperature that prohibits heat pump operation is 20ºC.
*2 The maximum fl ow temperature that allows heat pump operation equals to the maximum temperature set in the fl ow temp. range menu.
OCH532A
39
External input settings menu screen
Demand control screen
Outdoor thermostat setting screen
<Floor dry up function>
The Floor dry up function automatically changes the target hot water temperature
in stages to gradually dry concrete when this particular type of underfl oor heating
system is installed.
1. Turn off the system using the main controller.
2. From the Operation settings in the service menu, use F1 and F2 buttons to
scroll through the list until Floor dry up function is highlighted.
3. Press CONFIRM to display the FLOOR DRY UP screen.
4. To change settings, press F4. For details on settings, refer to the table below.
5. To start the Floor dry up operation, press F1 button to check a box below
“Active” and press CONFIRM.
*1. Upon completion of the operation the system stops all the operations except
the Freeze stat. operation.
*2. For Floor dry up function, the target fl ow temp. of Zone1 is the same as that of
Zone2.
Note:
This function is not available when a PUHZ-FRP outdoor unit is connected.
Disconnect wiring to external inputs of room thermostat, demand control,
and outdoor thermostat, or the target fl ow temp. may not be maintained.
•
•
Functions Symbol Description Option/Range Unit Default
Floor dry up function a
Set the function to ON and power on the system using the main
controller, and the dry up heating operation will start.
On/Off — Off
Flow temp.
(increase)
Flow temp. increase step b Sets the increase step of the target fl ow temp. +1 - +10 ºC +5
Increase interval c Sets the period for which the same target fl ow temp is maintained. 1 - 7 day 2
Flow temp.
(decrease)
Flow temp. decrease step d Sets the decrease step of the target fl ow temp. −1 - −10 ºC −5
Decrease interval e Sets the period for which the same target fl ow temp is maintained. 1 - 7 day 2
Target temperature
Start & Finish f Sets the target fl ow temp. at the start and the fi nish of the operation. 25 - 60 ºC 30
Max. target temp. g Sets the maximum target fl ow temp. 25 - 60 ºC 45
Max. temp. period h Sets the period for which the maximum target fl ow temp. is maintained. 1 - 20 day 5
45
40
35
30
0 1 2 3 4 5 6 7 8 9 101112 13 1415161718
(°C )
(b)
(d)
(h)
(c)
(f)
(e)
(g)
Days
Target fl ow temp.
External input settings
From the service menu use F1 and F2 buttons to highlight External input settings
then press CONFIRM.
<Demand control (IN4)>
From the External input settings menu highlight Demand control (IN4).
Press CONFIRM.
The Demand control screen is displayed.
1.
2.
3.
Press F3 button to select Heat source OFF or Boiler.
Press CONFIRM.
Note: The selection of “OFF”, whilst a signal is being sent to IN4, forcefully
stops all the heat source operations and the selection of “Boiler” stops
operations of heat pump and electric heater and performs boiler operation.
4.
5.
<Outdoor thermostat (IN5)>
From the External input settings menu highlight Outdoor thermostat (IN5).
Press CONFIRM.
The Outdoor thermostat screen is displayed.
Press F3 button to select Heater or Boiler.
Press CONFIRM.
Note: The selection of “Heater”, whilst a signal is being sent to IN5, performs
electric-heater-only operation and the selection of “Boiler” performs
boiler operation.
1.
2.
3.
4.
5.
OCH532A
40
Running information
This function shows current temperature and other data of main component parts
of both the indoor and outdoor units.
1. From the Service menu highlight Running information.
2. Press CONFIRM.
3. Press F3 and F4 buttons to set the Ref. address. *1
4. Use the function buttons to enter index code for the component to be viewed.
(See the Table 9-2-1 for component index codes.)
5. Press CONFIRM.
*1 For multiple outdoor units control system only.
Thermistor reading
This function shows the current readings of thermistors located on the water and refrigerant circuit
Thermistor Description Thermistor Description
TH1A Zone 1 room temperature THW6 Zone 1 flow water temperature
TH1B Zone 2 room temperature THW7 Zone 1 return water temperature
TH2 Refrigerant return temperature THW8 Zone 2 flow water temperature
THW1 Water flow temperature THW9 Zone 2 return water temperature
THW2 Water return temperature THWB1 Boiler flow water temperature
THW5 DHW tank water temperature THWB2 Boiler return water temperature
TH7 Ambient (outdoor) temperature
Summary of settings
This function shows the current installer/user entered settings.
Abbreviation
Explanation
Abbreviation
Explanation
HWtemp DHW max temp Z2 mode Operation mode
HWdrop DHW temperature drop - HER (Heating room temp)
HWtime DHW max operation time - HE (Heating flow temp)
NO HW DHW mode restriction - HCC (Heating compensation curve)
HWset DHW operation mode (Normal/Eco) - COR (—)
- CO (Cooling flow temp)
Ltemp Legionella hot water temp Hroom 1 Heating target room temp
Lfreq Legionella operation Frequency Hroom 2 Heating target room temp
Lstart Legionella mode start time Hflow 1 Heating target flow temp
Ltime Legionella max. operation time Hflow 2 Heating target flow temp
Lkeep Duration of max (Legionella) hot
water temp
Croom —
Cflow Cooling target flow temp
Z1 mode Operation mode FSflow Freeze stat function flow temp
- HER (Heating room temp) FSout Freeze stat function ambient temp
- HE (Heating flow temp)
- HCC (Heating compensation curve)
- COR (—)
- CO (Cooling flow temp)
Error history
Error history allows the service engineer to view previous Error codes, the unit
address and the date on which they occurred. Up to 16 Error codes can be stored
in the history the most recent Error event is displayed at the top of the list.
From the service menu select Error history
Press CONFIRM.
Please see chapter 10-4. for error code diagnosis and actions.
To delete an Error history item;
From Error history screen press F4 button (Rubbish bin icon)
Then press F3 button (Yes).
1.
2.
1.
2.
OCH532A
41
Password input screen
Password verify screen
Completion screen
Password protection
Password protection is available to prevent unauthorised access to the service
menu by untrained persons.
From the service menu use F1 and F2 buttons to scroll through list until
P
a
s
s
-
w
o
r
d
p
r
o
t
ect
i
o
n
is highlighted.
Press CONFIRM.
When password input screen is displayed use buttons F1 and F2 to move left
and right between the four digits, F3 to lower the selected digit by 1, and F4 to
increase the selected digit by 1.
When you have input your password press CONFIRM.
1.
2.
3.
4.
The password verify screen is displayed.
To verify your new password press button F3.
Your password is now set and the completion screen is displayed.
5.
6.
7.
<Resetting the password>
If you forget the password you entered, or have to service a unit somebody else
installed, you can reset the password to the factory default of 0000.
From the main settings menu scroll down the functions until Service Menu is
highlighted.
Press CONFIRM.
You will be prompted to enter a password.
Hold down buttons F3 and F4 together for 3 secs
You will be asked if you wish to continue and reset the password to default setting.
To reset press button F3.
The password is now reset to 0000.
1.
2.
3.
4.
5.
6.
7.
Manual reset
Should you wish to restore the factory settings at any time you should use the
manual reset function. Please note this will reset ALL functions to the factory default settings.
From the service menu use F1 and F2 buttons to scroll through list until Manual
Reset is highlighted.
Press CONFIRM.
The Manual reset screen is displayed.
Choose either Manual Reset for FTC4 or Main Controller.
1.
2.
3.
4.
Press F3 button to confi rm manual reset of chosen device.5.
OCH532A
42
SD card
The use of an SD memory card simplifi es the main controller settings in the fi eld.
*Ecodan service tool (for use with PC tool) is necessary for the setting.
<SD Main RC>
From the SD card setting use F1 and F2 buttons to scroll through list until
“SD Main RC” is highlighted.
Press CONFIRM.
Press F3 and F4 buttons to set the Ref. address. *1
Use F1, F2 and F3 buttons to select a menu to write to the main controller.
Press CONFIRM to start downloading.
Wait for a few minutes until “Complete!” appears.
*1 For multiple outdoor units control system only.
1.
2.
3.
4.
5.
6.
<Main RC SD>
From the SD card setting use F1 and F2 buttons to scroll through list until
Main RC SD is highlighted.
Press CONFIRM.
Press F3 and F4 buttons to set the Ref. address. *1
Use F1, F2 and F3 buttons to select a menu to write to the SD memory card.
Press CONFIRM to start uploading.
Wait for a few minutes until “Complete!” appears.
*1 For multiple outdoor units control system only.
1.
2.
3.
4.
5.
6.
OCH532A
43
Note
Refer to outdoor unit service manual for request code 0 to 102, 106 to 149.
Request codes 103 to 105 indicate error histories of both indoor and outdoor units.
As only four digits can be displayed at one time the software version number is displayed in two halves.
Enter code 190 to see the fi rst four digits and code 191 to see the last four digits.
For example software version No. 5.01 A000, when code 190 is entered 0501 is displayed, when code 191 is entered A000 is displayed.
<Table 9-2-1>
Request
code
Request content Range Unit
103 Error history 1 (latest) Displays error history. ("– –" is displays if no history is present.) Code
104 Error history 2 (second to last) Displays error history. ("– –" is displays if no history is present.) —
105 Error history 3 (third to last) Displays error history. ("– –" is displays if no history is present.) —
154 Water circulation pump 1 - Accumulated operating time (after reset) 0 - 9999 10 hours
156 Water circulation pump 2 - Accumulated operating time (after reset) 0 - 9999 10 hours
157 Water circulation pump 3 - Accumulated operating time (after reset) 0 - 9999 10 hours
162 Indoor unit - Dip SW1 setting information Refer to detail contents described hereinafter. —
163 Indoor unit - Dip SW2 setting information Refer to detail contents described hereinafter. —
164 Indoor unit - Dip SW3 setting information Refer to detail contents described hereinafter. —
165 Indoor unit - Dip SW4 setting information Refer to detail contents described hereinafter. —
175 Indoor unit - Output signal information Refer to detail contents described hereinafter. —
176 Indoor unit - Input signal information Refer to detail contents described hereinafter. —
177 Mixing valve opening step 0 - 10 Step
190 Indoor unit - Software version 1st 4 digits Refer to Note below. —
191 Indoor unit - Software version last 4 digits Refer to Note below. —
340 Water circulation pump 1 - Accumulated operating time reset — —
342 Water circulation pump 2 - Accumulated operating time reset — —
343 Water circulation pump 3 - Accumulated operating time reset — —
504 Indoor unit - Zone 1 room temp. (TH1A) –39 - 88 °C
505 Indoor unit - Ref. liquid temp. (TH2) –39 - 88 °C
506 Indoor unit - Return water temp. (THW2) –39 - 88 °C
507 Indoor unit - Zone 2 room temp. (TH1B) –39 - 88 °C
508 Indoor unit - DHW tank water temp. (THW5) –39 - 88 °C
509 Indoor unit - Zone 1 fl ow water temp. (THW6) –39 - 88 °C
510 Indoor unit - Outside air temp. (TH7) –39 - 88 °C
511 Indoor unit - Flow water temp. (THW1) –39 - 88 °C
512 Indoor unit - Zone 1 return water temp. (THW7) –39 - 88 °C
513 Indoor unit - Zone 2 flow water temp. (THW8) –39 - 88 °C
514 Indoor unit - Zone 2 return water temp. (THW9) –39 - 88 °C
515 Indoor unit - Boiler flow water temp. (THWB1) –40 - 140 °C
516 Indoor unit - Boiler return water temp. (THWB2) –40 - 140 °C
550 Indoor unit - Error postponement history 1 (latest)
Displays postponement code.
("– –" is displays if no postponement code is present.)
—
551 Indoor unit - Operation control at time of error 0 Standard, 1 Heater, 2 Boiler —
552
Indoor unit - Operation mode at time of error 0 OFF, 1 DHW, 2 Heating, 3 Cooling 4, Legionella prevention,
5 Freeze protection, 6 Operation stop
—
553 Indoor unit - Output signal information at time of error Refer to detail contents described hereinafter —
554 Indoor unit - Input signal information at time of error Refer to detail contents described hereinafter —
555 Indoor unit - Zone 1 room temp. (TH1A) at time of error –39 - 88 °C
556 Indoor unit - Zone 2 room temp. (TH1B) at time of error –39 - 88 °C
557 Indoor unit - Ref. liquid temp. (TH2) at time of error –39 - 88 °C
558 Indoor unit - Flow water temp. (THW1) at time of error –39 - 88 °C
559 Indoor unit - Return water temp. (THW2) at time of error –39 - 88 °C
560 Indoor unit - DHW tank water temp. (THW5) at time of error –39 - 88 °C
561 Indoor unit - Zone 1 flow water temp. (THW6) at time of error –39 - 88 °C
562 Indoor unit - Zone 1 return water temp. (THW7) at time of error –39 - 88 °C
563 Indoor unit - Zone 2 flow water temp. (THW8) at time of error –39 - 88 °C
564 Indoor unit - Zone 2 return water temp. (THW9) at time of error –39 - 88 °C
565 Indoor unit - Boiler flow water temp. (THWB1) at time of error –40 - 140 °C
566 Indoor unit - Boiler return water temp. (THWB2) at time of error –40 - 140 °C
567
Indoor unit - Failure (P1/P2/L5/L8/Ld) thermistor 0 Failure thermistor is none, 1 TH1A, 2 TH2, 3 THW1, 4 THW2,
5 THWB1, 6 THW5, 7 THWB2, 8 TH1B, A THW6, B THW7,
C THW8, D THW9
—
568 Mixing valve opening step at time of error 0 - 10 Step
569
Operated Flow switch at time of failure (L9) 0 No operated flow switch, 1 Flow switch 1, 2 Flow switch 2,
3 Flow switch 3
—
OCH532A
44
Indoor unit switch setting display (Request code: 162 to 165)
0: OFF 1: ON
SW1, SW2, SW3, SW4
Display
12345678
00000000 00 00
10000000 00 01
01000000 00 02
11000000 00 03
00100000 00 04
10100000 00 05
01100000 00 06
11100000 00 07
00010000 00 08
10010000 00 09
01010000 00 0A
11010000 00 0B
00110000 00 0C
10110000 00 0D
01110000 00 0E
11110000 00 0F
00001000 00 10
10001000 00 11
01001000 00 12
11001000 00 13
00101000 00 14
10101000 00 15
01101000 00 16
11101000 00 17
00011000 00 18
10011000 00 19
01011000 00 1A
11011000 00 1B
00111000 00 1C
10111000 00 1D
01111000 00 1E
11111000 00 1F
00000100 00 20
10000100 00 21
01000100 00 22
11000100 00 23
00100100 00 24
10100100 00 25
01100100 00 26
11100100 00 27
00010100 00 28
10010100 00 29
01010100 00 2A
11010100 00 2B
00110100 00 2C
10110100 00 2D
01110100 00 2E
11110100 00 2F
00001100 00 30
10001100 00 31
01001100 00 32
11001100 00 33
00101100 00 34
10101100 00 35
01101100 00 36
11101100 00 37
00011100 00 38
10011100 00 39
01011100 00 3A
11011100 00 3B
00111100 00 3C
10111100 00 3D
01111100 00 3E
11111100 00 3F
0: OFF 1: ON
SW1, SW2, SW3, SW4
Display
12345678
00000010 00 40
10000010 00 41
01000010 00 42
11000010 00 43
00100010 00 44
10100010 00 45
01100010 00 46
11100010 00 47
00010010 00 48
10010010 00 49
01010010 00 4A
11010010 00 4B
00110010 00 4C
10110010 00 4D
01110010 00 4E
11110010 00 4F
00001010 00 50
10001010 00 51
01001010 00 52
11001010 00 53
00101010 00 54
10101010 00 55
01101010 00 56
11101010 00 57
00011010 00 58
10011010 00 59
01011010 00 5A
11011010 00 5B
00111010 00 5C
10111010 00 5D
01111010 00 5E
11111010 00 5F
00000110 00 60
10000110 00 61
01000110 00 62
11000110 00 63
00100110 00 64
10100110 00 65
01100110 00 66
11100110 00 67
00010110 00 68
10010110 00 69
01010110 00 6A
11010110 00 6B
00110110 00 6C
10110110 00 6D
01110110 00 6E
11110110 00 6F
00001110 00 70
10001110 00 71
01001110 00 72
11001110 00 73
00101110 00 74
10101110 00 75
01101110 00 76
11101110 00 77
00011110 00 78
10011110 00 79
01011110 00 7A
11011110 00 7B
00111110 00 7C
10111110 00 7D
01111110 00 7E
11111110 00 7F
OCH532A
45
Indoor unit switch setting display (Request code: 162 to 165)
0: OFF 1: ON
SW1, SW2, SW3, SW4
Display
12345678
00000001 00 80
10000001 00 81
01000001 00 82
11000001 00 83
00100001 00 84
10100001 00 85
01100001 00 86
11100001 00 87
00010001 00 88
10010001 00 89
01010001 00 8A
11010001 00 8B
00110001 00 8C
10110001 00 8D
01110001 00 8E
11110001 00 8F
00001001 00 90
10001001 00 91
01001001 00 92
11001001 00 93
00101001 00 94
10101001 00 95
01101001 00 96
11101001 00 97
00011001 00 98
10011001 00 99
01011001 00 9A
11011001 00 9B
00111001 00 9C
10111001 00 9D
01111001 00 9E
11111001 00 9F
00000101 00 A0
10000101 00 A1
01000101 00 A2
11000101 00 A3
00100101 00 A4
10100101 00 A5
01100101 00 A6
11100101 00 A7
00010101 00 A8
10010101 00 A9
01010101 00 AA
11010101 00 AB
00110101 00 AC
10110101 00 AD
01110101 00 AE
11110101 00 AF
00001101 00 B0
10001101 00 B1
01001101 00 B2
11001101 00 B3
00101101 00 B4
10101101 00 B5
01101101 00 B6
11101101 00 B7
00011101 00 B8
10011101 00 B9
01011101 00 BA
11011101 00 BB
00111101 00 BC
10111101 00 BD
01111101 00 BE
11111101 00 BF
0: OFF 1: ON
SW1, SW2, SW3, SW4
Display
12345678
00000011 00 C0
10000011 00 C1
01000011 00 C2
11000011 00 C3
00100011 00 C4
10100011 00 C5
01100011 00 C6
11100011 00 C7
00010011 00 C8
10010011 00 C9
01010011 00 CA
11010011 00 CB
00110011 00 CC
10110011 00 CD
01110011 00 CE
11110011 00 CF
00001011 00 D0
10001011 00 D1
01001011 00 D2
11001011 00 D3
00101011 00 D4
10101011 00 D5
01101011 00 D6
11101011 00 D7
00011011 00 D8
10011011 00 D9
01011011 00 DA
11011011 00 DB
00111011 00 DC
10111011 00 DD
01111011 00 DE
11111011 00 DF
00000111 00 E0
10000111 00 E1
01000111 00 E2
11000111 00 E3
00100111 00 E4
10100111 00 E5
01100111 00 E6
11100111 00 E7
00010111 00 E8
10010111 00 E9
01010111 00 EA
11010111 00 EB
00110111 00 EC
10110111 00 ED
01110111 00 EE
11110111 00 EF
00001111 00 F0
10001111 00 F1
01001111 00 F2
11001111 00 F3
00101111 00 F4
10101111 00 F5
01101111 00 F6
11101111 00 F7
00011111 00 F8
10011111 00 F9
01011111 00 FA
11011111 00 FB
00111111 00 FC
10111111 00 FD
01111111 00 FE
11111111 00 FF
OCH532A
46
Output signal display (Request code: 175/553)
Please refer to Table 2 on relevant wiring diagram whilst using the following.
0: OFF 1: ON
OUT
Display
12345A5B67
00000000 xx 00
10000000 xx 01
01000000 xx 02
11000000 xx 03
00100000 xx 04
10100000 xx 05
01100000 xx 06
11100000 xx 07
00010000 xx 08
10010000 xx 09
01010000 xx 0A
11010000 xx 0B
00110000 xx 0C
10110000 xx 0D
01110000 xx 0E
11110000 xx 0F
00001000 xx 10
10001000 xx 11
01001000 xx 12
11001000 xx 13
00101000 xx 14
10101000 xx 15
01101000 xx 16
11101000 xx 17
00011000 xx 18
10011000 xx 19
01011000 xx 1A
11011000 xx 1B
00111000 xx 1C
10111000 xx 1D
01111000 xx 1E
11111000 xx 1F
00000100 xx 20
10000100 xx 21
01000100 xx 22
11000100 xx 23
00100100 xx 24
10100100 xx 25
01100100 xx 26
11100100 xx 27
00010100 xx 28
10010100 xx 29
01010100 xx 2A
11010100 xx 2B
00110100 xx 2C
10110100 xx 2D
01110100 xx 2E
11110100 xx 2F
00001100 xx 30
10001100 xx 31
01001100 xx 32
11001100 xx 33
00101100 xx 34
10101100 xx 35
01101100 xx 36
11101100 xx 37
00011100 xx 38
10011100 xx 39
01011100 xx 3A
11011100 xx 3B
00111100 xx 3C
10111100 xx 3D
01111100 xx 3E
11111100 xx 3F
0: OFF 1: ON
OUT
Display
12345A5B67
00000010 xx 40
10000010 xx 41
01000010 xx 42
11000010 xx 43
00100010 xx 44
10100010 xx 45
01100010 xx 46
11100010 xx 47
00010010 xx 48
10010010 xx 49
01010010 xx 4A
11010010 xx 4B
00110010 xx 4C
10110010 xx 4D
01110010 xx 4E
11110010 xx 4F
00001010 xx 50
10001010 xx 51
01001010 xx 52
11001010 xx 53
00101010 xx 54
10101010 xx 55
01101010 xx 56
11101010 xx 57
00011010 xx 58
10011010 xx 59
0 1 0 1 1 0 1 0 xx 5A
11011010 xx 5B
00111010 xx 5C
10111010 xx 5D
01111010 xx 5E
11111010 xx 5F
00000110 xx 60
10000110 xx 61
01000110 xx 62
11000110 xx 63
00100110 xx 64
10100110 xx 65
01100110 xx 66
11100110 xx 67
00010110 xx 68
10010110 xx 69
01010110 xx 6A
11010110 xx 6B
00110110 xx 6C
10110110 xx 6D
01110110 xx 6E
11110110 xx 6F
00001110 xx 70
10001110 xx 71
01001110 xx 72
11001110 xx 73
00101110 xx 74
10101110 xx 75
01101110 xx 76
11101110 xx 77
00011110 xx 78
10011110 xx 79
0 1 0 1 1 1 1 0 xx 7A
11011110 xx 7B
00111110 xx 7C
10111110 xx 7D
01111110 xx 7E
11111110 xx 7F
OCH532A
47
Output signal display (Request code: 175/553)
Please refer to Table 2 on relevant wiring diagram whilst using the following.
0: OFF 1: ON
OUT
Display
12345A5B67
00000001 xx 80
10000001 xx 81
01000001 xx 82
11000001 xx 83
00100001 xx 84
10100001 xx 85
01100001 xx 86
11100001 xx 87
00010001 xx 88
10010001 xx 89
01010001 xx 8A
11010001 xx 8B
00110001 xx 8C
10110001 xx 8D
01110001 xx 8E
11110001 xx 8F
00001001 xx 90
10001001 xx 91
01001001 xx 92
1 1 0 0 1 0 0 1 xx 93
00101001 xx 94
10101001 xx 95
01101001 xx 96
11101001 xx 97
00011001 xx 98
10011001 xx 99
01011001 xx 9A
11011001 xx 9B
00111001 xx 9C
10111001 xx 9D
01111001 xx 9E
11111001 xx 9F
00000101 xx A0
10000101 xx A1
01000101 xx A2
11000101 xx A3
0 0 1 0 0 1 0 1 xx A4
10100101 xx A5
01100101 xx A6
11100101 xx A7
00010101 xx A8
10010101 xx A9
01010101 xx AA
11010101 xx AB
00110101 xx AC
10110101 xx AD
01110101 xx AE
11110101 xx AF
00001101 xx B0
10001101 xx B1
01001101 xx B2
11001101 xx B3
00101101 xx B4
10101101 xx B5
01101101 xx B6
11101101 xx B7
00011101 xx B8
10011101 xx B9
01011101 xx BA
11011101 xx BB
00111101 xx BC
10111101 xx BD
01111101 xx BE
11111101 xx BF
0: OFF 1: ON
OUT
Display
12345A5B67
00000011 xx C0
10000011 xx C1
01000011 xx C2
11000011 xx C3
00100011 xx C4
10100011 xx C5
01100011 xx C6
11100011 xx C7
00010011 xx C8
10010011 xx C9
01010011 xx CA
11010011 xx CB
00110011 xx CC
10110011 xx CD
01110011 xx CE
11110011 xx CF
00001011 xx D0
10001011 xx D1
0 1 0 0 1 0 1 1 xx D2
11001011 xx D3
00101011 xx D4
10101011 xx D5
01101011 xx D6
11101011 xx D7
00011011 xx D8
10011011 xx D9
01011011 xx DA
11011011 xx DB
00111011 xx DC
10111011 xx DD
01111011 xx DE
11111011 xx DF
00000111 xx E0
10000111 xx E1
0 1 0 0 0 1 1 1 xx E2
11000111 xx E3
00100111 xx E4
10100111 xx E5
01100111 xx E6
11100111 xx E7
00010111 xx E8
10010111 xx E9
01010111 xx EA
11010111 xx EB
00110111 xx EC
10110111 xx ED
01110111 xx EE
11110111 xx EF
00001111 xx F0
10001111 xx F1
01001111 xx F2
11001111 xx F3
00101111 xx F4
10101111 xx F5
01101111 xx F6
11101111 xx F7
00011111 xx F8
10011111 xx F9
01011111 xx FA
11011111 xx FB
00111111 xx FC
10111111 xx FD
01111111 xx FE
11111111 xx FF
OCH532A
48
Output signal display (Request code: 175/553)
Please refer to Table 2 on relevant wiring diagram whilst using the following.
Mixing valve state
OUT
Mixing valve state
5A 5B
0 0 Stop
0 1 Stop
1 0 Open
1 1 Close
0: OFF 1: ON
OUT
Display
8 9 10 11 12 13 14 15
00000000 00 xx
10000000 01 xx
01000000 02 xx
11000000 03 xx
00100000 04 xx
10100000 05 xx
01100000 06 xx
11100000 07 xx
00010000 08 xx
10010000 09 xx
01010000 0A xx
11010000 0B xx
00110000 0C xx
10110000 0D xx
01110000 0E xx
11110000 0F xx
00001000 10 xx
10001000 11 xx
01001000 12 xx
11001000 13 xx
00101000 14 xx
10101000 15 xx
01101000 16 xx
11101000 17 xx
00011000 18 xx
10011000 19 xx
01011000 1A xx
11011000 1B xx
00111000 1C xx
10111000 1D xx
01111000 1E xx
11111000 1F xx
00000100 20 xx
10000100 21 xx
01000100 22 xx
11000100 23 xx
00100100 24 xx
10100100 25 xx
01100100 26 xx
11100100 27 xx
00010100 28 xx
10010100 29 xx
01010100 2A xx
11010100 2B xx
00110100 2C xx
1 0 1 1 0 1 0 0 2D xx
01110100 2E xx
11110100 2F xx
00001100 30 xx
10001100 31 xx
01001100 32 xx
11001100 33 xx
00101100 34 xx
10101100 35 xx
01101100 36 xx
11101100 37 xx
00011100 38 xx
10011100 39 xx
01011100 3A xx
11011100 3B xx
00111100 3C xx
10111100 3D xx
01111100 3E xx
11111100 3F xx
OCH532A
49
0: OFF (open) 1: ON (short)
IN
Display
12345678
00000000 00 00
10000000 00 01
01000000 00 02
11000000 00 03
00100000 00 04
10100000 00 05
01100000 00 06
11100000 00 07
00010000 00 08
10010000 00 09
01010000 00 0A
11010000 00 0B
00110000 00 0C
10110000 00 0D
01110000 00 0E
11110000 00 0F
00001000 00 10
10001000 00 11
01001000 00 12
11001000 00 13
00101000 00 14
10101000 00 15
01101000 00 16
11101000 00 17
00011000 00 18
10011000 00 19
01011000 00 1A
11011000 00 1B
00111000 00 1C
10111000 00 1D
01111000 00 1E
11111000 00 1F
00000100 00 20
10000100 00 21
01000100 00 22
11000100 00 23
00100100 00 24
10100100 00 25
0 1 1 0 0 1 0 0 00 26
11100100 00 27
00010100 00 28
10010100 00 29
01010100 00 2A
11010100 00 2B
00110100 00 2C
10110100 00 2D
01110100 00 2E
11110100 00 2F
00001100 00 30
10001100 00 31
01001100 00 32
11001100 00 33
00101100 00 34
10101100 00 35
01101100 00 36
11101100 00 37
00011100 00 38
10011100 00 39
01011100 00 3A
11011100 00 3B
00111100 00 3C
10111100 00 3D
01111100 00 3E
11111100 00 3F
Input signal display (Request code: 176/554)
Please refer to Table 1 on relevant wiring diagram whilst using the following.
0: OFF (open) 1: ON (short)
IN
Display
12345678
00000010 00 40
10000010 00 41
01000010 00 42
11000010 00 43
00100010 00 44
10100010 00 45
0 1 1 0 0 0 1 0 00 46
11100010 00 47
00010010 00 48
10010010 00 49
01010010 00 4A
11010010 00 4B
00110010 00 4C
10110010 00 4D
01110010 00 4E
11110010 00 4F
00001010 00 50
10001010 00 51
01001010 00 52
11001010 00 53
00101010 00 54
10101010 00 55
01101010 00 56
11101010 00 57
00011010 00 58
10011010 00 59
01011010 00 5A
11011010 00 5B
00111010 00 5C
10111010 00 5D
01111010 00 5E
11111010 00 5F
00000110 00 60
10000110 00 61
01000110 00 62
11000110 00 63
00100110 00 64
10100110 00 65
01100110 00 66
1 1 1 0 0 1 1 0 00 67
00010110 00 68
10010110 00 69
0 1 0 1 0 1 1 0 00 6A
11010110 00 6B
00110110 00 6C
10110110 00 6D
01110110 00 6E
11110110 00 6F
00001110 00 70
10001110 00 71
01001110 00 72
11001110 00 73
00101110 00 74
10101110 00 75
01101110 00 76
11101110 00 77
00011110 00 78
10011110 00 79
01011110 00 7A
11011110 00 7B
00111110 00 7C
10111110 00 7D
01111110 00 7E
11111110 00 7F
OCH532A
50
F1 F2 F3 F4
<Emergency operation (Heater)>
In Emergency operation mode the outdoor heat pump unit will not operate. Heating for DHW and space heating is provided by the booster heater and the tank
immersion heater (if installed). Space heating flow temp is restricted 40°C if an
immersion heater is not present on the DHW tank then the booster heater will
also indirectly heat the DHW.
When in Emergency operation the main control has NO control functions. It's only
function is to display the Main screen and Information screen by pressing F1, all
other buttons are disabled.
• Activating Emergency operation mode
To activate Emergency operation see the following:
Switch OFF the breaker for the outdoor unit (or both breakers if cylinder powered independently).
Change DIP switch SW4-5 to ON.
Switch ON the breaker(s).
Emergency Operation is now activated.
• Deactivating Emergency operation mode
To deactivate Emergency operation see the following:
Switch OFF the breaker for the outdoor unit (or both breakers if cylinder powered independently).
Change DIP switch SW4-5 to OFF.
Switch ON the breaker(s).
Emergency operation is now deactivated.
<Emergency operation (Boiler)>
In Emergency operation mode the outdoor heat pump unit will not operate. Heating for space heating is provided by the boiler.
When in Emergency operation the main control has NO control functions. It's only
function is to display the Main screen and Information screen by pressing F1, all
other buttons are disabled.
• Activating Emergency operation mode
To activate Emergency operation see the following:
Switch OFF the breaker for the outdoor unit (or both breakers if cylinder powered independently).
Change DIP switch SW4-6 to ON.
Switch ON the breaker(s).
Emergency Operation is now activated.
• Deactivating Emergency operation mode
To deactivate Emergency operation see the following:
Switch OFF the breaker for the outdoor unit (or both breakers if cylinder powered independently).
Change DIP switch SW4-6 to OFF.
Switch ON the breaker(s).
Emergency operation is now deactivated.
WARNING
Do not attempt to change the DIP switches whilst the breaker(s) are ON as
this could result in ELECTROCUTION.
1.
2.
3.
4.
1.
2.
3.
4.
1.
2.
3.
4.
1.
2.
3.
4.
F1 F2 F3 F4
OCH532A
51
TROUBLESHOOTING
10
10-1. Troubleshooting
<Summary of self diagnosis based on Error Codes and Service Procedures>
Present and past Error codes are logged and displayed on the main controller or control board of the outdoor unit.
Please refer to the table below and subsequent explanations to diagnose and remedy typical problems that may occur in the fi eld.
Unit Condition Error Code Action
Reoccurring problem
Displayed Use table 10-4. "Self diagnosis and action" to identify fault and correct.
Not Displayed Use table 10-5. "Troubleshooting by inferior phenomena" to identify fault and correct.
Non reoccurring problem Logged 1. Check temporary causes of defects such as the operation of safety devices on the re-
frigerant/water circuit including compressor, poor wiring, electrical noise etc. Re-check
the symptom and the installation environment, refrigerant amount (Split systems only),
weather conditions at time of fault etc.
2. Reset Error code logs, Service the unit and restart system.
Not Logged
1. Recheck the abnormal symptom
2. Identify cause of problem and take corrective action according to Table 10-5. "Troubleshooting by inferior phenomena"
3. If no obvious problem can be found continue to operate the unit.
NOTE
Electrical components should only be replaced as a fi nal option. Please follow instructions in Tables 10-4. and 10-5. Error Codes and Inferior Phenom-
ena fully before resorting to replacing parts.
10-2. Test Run
Before a test run
• After installation of outdoor unit, pipework and electrical wiring, recheck that there is no water leakage, loosened connections or miswiring.
• Measure impedance between the ground and the power supply terminal block (L,N) on the outdoor and indoor units with suitable (500V) ohmmeter. Resistance
should be ≥ 1.0MΩ .
• Read the Installation and Operation Manuals fully especially the safety requirements before carrying out any test runs.
10-3. Malfunction diagnosis method by main controller
If during start up or operation a malfunction occurs the error code screen may be displayed on the main controller.
The error code screen shows the following; code, unit, ref. address, and telephone number of installer (only if previously entered by the installer)
Please not in the case of some malfunctions an error code is not generated please refer to table 10-5. for more details.
To reset
1. To reset the main controller press F4 button (Reset).
2. Then press F3 (Yes) to confi rm.
OCH532A
52
10-4. Self diagnosis and action
Check if Dip SW is set correctly. (Refer to Chapter 6-11.)
Error code Title and display conditions Possible Cause Diagnosis and action
L3 Circulation water temperature overheat
protection
<DHW/Heating/Cooling/LP/FS/OS>
Error code displayed when THW1 detects a
temp. ≥ 80ºC for 10 consecutive seconds or
THW2 detects a temp. ≥ 80ºC for 10 consecutive
seconds.
DHW : Domestic hot water mode
Heating : Heating mode
Cooling : Cooling mode
LP : Legionella prevention mode
FS : Freeze stat
OS : Operation stop
TH1A/B : Room temp. thermistor
TH2 : Liquid refrigerant temp. thermistor
THW1 : Flow water temp. thermistor
THW2 : Return water temp. thermistor
THW5 : Tank water temp. thermistor
THW6 :
Zone 1 fl ow water temperature thermistor
THW7 :
Zone 1 return water temperature thermistor
THW8 :
Zone 2 fl ow water temperature thermistor
THW9 :
Zone 2 return water temperature thermistor
THWB1 :
Boiler flow water temperature thermistor
THWB2 :
Boiler return water temperature thermistor
1. Insuffi cient system head 1. Refer to table in section 10-6. to determine if
system pump meets requirements.
If more head required either add an pump of
the same size or replace existing pump with
capacity model.
See 11. DISASSEMBLY PROCEDURE for
how to replace pump.
2. Reduced fl ow in primary water circuit
Due to 1 or more of the following;
Faulty pump, insufficient air purge,
blockedstrainer, leak in water circuit.
2. Check circulation pump (See 10-6. for how
to check).
Open purge valve to remove trapped air.
Check the strainer for blockages.
Check the primary water circuit for leaks.
Check that the fl ow amount is within the rec-
ommended range.
3. Valve operation fault 3. Check valves on primary water circuit are
installed level.
4. 2-way valve (field supply) actuator
fault
4. Electrically test to determine fault.
5. 3-way valve actuator fault 5. 1) Electrically test to determine fault.
2) Operate 3-way valve manually using the
main remote controller. (Refer to <Manual
operation> in 9.2).
3) Replace 3-way valve coil.
4)
Replace 3-way valve. (Refer to Procedure
6 in “11. DISASSEMBLY PROCEDURE.”
6. Booster heater relay (BHC1, BHC2,
BHCP) operating fault
6. Electrically test the relays (BHC1, BHC2,
BHCP) to determine fault.
See 10-6. for how to check.
7. Power supply voltage increase 7. Check the supply voltage.
8. THW1 or THW5 has become detached from its holder.
8. Visually inspect location and reattach as
necessary.
9. THW1 or THW2 fault 9. Check resistance of thermistor against table
in section 10-6.
Compare FTC4 detected temperature to
hand held detector.
10.
FTC4 board failure
10.
Replace board.
L4
Tank water temperature overheat protection
<DHW/Heating/Cooling/LP/FS/OS>
Error code display when THW5 detects a
temp. ≥ 75ºC for 10 consecutive seconds.
1. 3-way valve actuator fault 1. 1) Electrically test to determine fault.
2) Operate 3-way valve manually using the
main remote controller. (Refer to <Manual
operation> in 9.2).
3) Replace 3-way valve coil.
4) Replace 3-way valve. (Refer to Procedure
6 in “11. DISASSEMBLY PROCEDURE.”
2. Immersion heater relay (IHC) operat-
ing fault
2. Check immersion heater relay (IHC)
3. THW5 fault 3. Check resistance of thermistor against table
in section 10-6.
Compare FTC4 detected temperature to
hand held detector.
4. FTC4 board failure 4. Replace board.
OCH532A
53
Error code Title and display conditions Possible Cause Diagnosis and action
P1/P2/L5/LD Indoor unit temperature thermistor failure
* The thermistors subject to failure can be
checked in “Request code: 567” in “Running
information
<DHW/Heating/Cooling/LP/FS/OS>
Error code displayed when thermistor is at open
or short (see table).
Exceptions
Error code will not be displayed for TH2; During
defrost and for 10 mins after defrost operation.
Error code
Thermistor
Open detection Short detection
Symbol Name
P1 TH1A/TH1B Room temperature thermistor -39ºC or below 88.5ºC or above
P2 TH2 Liquid temperature thermistor -39ºC or below 88.5ºC or above
L5
THW1 Flow water temperature thermistor -39ºC or below 88.5ºC or above
THW2 Return water temperature thermistor -39ºC or below 88.5ºC or above
THW5 Tank water temperature thermistor -39ºC or below 88.5ºC or above
THW6
Zone 1 fl ow water temperature thermistor
-39ºC or below 88.5ºC or above
THW7
Zone 1 return water temperature thermistor
-39ºC or below 88.5ºC or above
THW8
Zone 2 fl ow water temperature thermistor
-39ºC or below 88.5ºC or above
THW9
Zone 2 return water temperature thermistor
-39ºC or below 88.5ºC or above
LD
THWB1
Boiler flow water temperature thermistor
-40ºC or below 140ºC or above
THWB2
Boiler return water temperature thermistor
-40ºC or below 140ºC or above
1. Connector/terminal wire has become
detached or loose wiring.
1. Visually check the terminals and connections and reattachas appropriate.
2. Thermistor fault 2. Check resistance of thermistor against table in section 10-6.
Compare FTC4 detected temperature to
hand held detector.
3. FTC4 board failure 3. Replace board.
4. The thermistor on the wireless remote
controller or the main remote controller may be defective. (when Room
temp. is chosen for the Heating operation and when Main Controller or
Room RC 1-8 is chosen for the Room
Sensor setting in the Initial setting)
4. Replace wireless remote controller or main
remote controller
5. Incorrect setting of the Dip switch(es) 5. Check the Dip switch setting(s).
L6 Circulation water freeze protection
<DHW/Heating/Cooling/LP/FS/OS>
Error code displayed when THW1 detects a
temp. ≤ 1ºC for 10 consecutive seconds or
THW2 detects a temp. ≤ 3ºC for 10 consecutive
seconds.
Exception
Error code will not be displayed if;
FS function is disabled,
For 10 mins after water circulation pump1 is
switched on.
1. Insuffi cient system head 1. Refer to table in section 10-6. to determine
if system pump meets requirements.
If more head required either add an pump
of the same size or replace existing pump
with capacity model.
See 11. DISASSEMBLY PROCEDURE for
how to replace pump.
2. Reduced fl ow in primary water circuit.
Due to 1 or more of the following;
Faulty pump, insufficient air purge,
blockedstrainer, leak in water circuit.
2. Check circulation pump (See 10-6. for how
to check).
Open purge valve to remove trapped air.
Check the strainer for blockages.
Check the primary water circuit for leaks.
Check that the flow amount is within the
recommended range.
3. Valve operation fault 3. Check valves on primary water circuit are
installed level.
4. 2-way valve (fi eld supply) actuator fault 4. Electrically test to determine fault.
5. 3-way valve actuator fault 5. 1) Electrically test to determine fault.
2) Operate 3-way valve manually using the
main remote controller. (Refer to <Manual operation> in 9.2).
3) Replace 3-way valve coil.
4) Replace 3-way valve. (Refer to Procedure
6 in “11. DISASSEMBLY PROCEDURE.”
6. THW1 has become detached from its
holder.
6. Visually inspect location and reattach as
necessary.
7. THW1 or THW2 fault 7. Check resistance of thermistor against table
in section 10-6.
Compare FTC4 detected temperature to
hand held detector.
8. FTC4 board failure 8. Replace board.
OCH532A
54
Error code Title and display conditions Possible Cause Diagnosis and action
L8 Heating operation error
* “3” is displayed in “Request code: 567” in “Run-
ning information”.
<Heating/FS>
If a), b) and c) occur, L8 is displayed;
a)
No change on THW1 and THW5
(under 1 °C for 20 minutes from unit starts
operation)
b) No change on THW1
(under 1 °C for 10 minutes from booster heater
starts operation)
c) THW1 - THW2 < -5 °C
(for 10 minutes continuously)
1. THW1 has become detached from its
holder.
1. Visually inspect location and reattach as
necessary.
2. Booster heater fault 2. Electrically test to determine fault.
See 10-6. for how to check.
3. THW1 or THW2 or THW5 fault 3. Check resistance of thermistor against
table in section 10-6.
Compare FTC4 detected temperature to
hand held detector.
4. FTC4 board failure 4. Replace board.
Heating operation error
* “A” is displayed in “Request code: 567” in
“Running information”.
1. THW6 has become detached from its
holder.
1. Visually inspect location and reattach as
necessary.
2. THW6 or THW7 fault 2. Check resistance of thermistor against
table in section 10-6.
Compare FTC4 detected temperature to
hand held detector.
3. FTC4 board failure 3. Replace board.
Heating operation error
* “C” is displayed in “Request code: 567” in
“Running information”.
1. THW8 has become detached from its
holder.
1. Visually inspect location and reattach as
necessary.
2. THW8 or THW9 fault 2. Check resistance of thermistor against
table in section 10-6.
Compare FTC4 detected temperature to
hand held detector.
3. FTC4 board failure 3. Replace board.
L9 Low primary circuit (Heat source side) fl ow
rate detected by fl ow switch
* “1” is displayed in “Request code: 569” in “Run-
ning information”.
<DHW/Heating/Cooling/LP/FS>
Error code displayed when fl ow switch detects
low fl ow rate for 10 seconds.
Exception
For 1 min after water circulation pump1 is
switched on.
1. Insuffi cient system head 1. Refer to table in section 10-6. to determine
if system pump meets requirements.
If more head required either add an pump
of the same size or replace existing pump
with capacity model.
See 11. DISASSEMBLY PROCEDURE for
how to replace pump.
2. Reduced fl ow in primary water circuit
Due to 1 or more of the following;
Faulty pump, insuffi cient air purge,
blocked strainer, leak in water circuit.
2. Check circulation pump (See 10-6. for how
to check).
Open purge valve to remove trapped air.
Check the strainer for blockages.
Check the primary water circuit for leaks.
Check that the flow amount is within the
recommended range.
3. Valve operation fault 3. Check valves on primary water circuit are
installed level.
4.
2-way valve (fi eld supply) actuator
fault 4. Electrically test to determine fault.
5. Connector/terminal wire has become
detached or loose wiring.
5. Visually check the CN2F connector and
IN2 terminal and reattach if necessary.
6. Flow switch fault 6. Electrically test to determine fault.
See 10-6. for how to check.
7. Incorrect setting of the SW2-2 7. Check the SW2-2 setting.
8. FTC4 board failure 8. Replace board.
Low primary circuit (Zone1 side) fl ow rate
detected by fl ow switch
* “2” is displayed in “Request code: 569” in “Run-
ning information”.
1. Insuffi cient system head 1. If more head required either add an pump
of the same size or replace existing pump.
2. Reduced fl ow in primary water circuit
Due to 1 or more of the following;
Faulty pump, insuffi cient air purge,
blocked strainer, leak in water circuit.
2. Check circulation pump (See 10-6. for how
to check).
Open purge valve to remove trapped air.
Check the strainer for blockages.
Check the primary water circuit for leaks.
Check that the flow amount is within the
recommended range.
3. Terminal wire has become detached
or loose wiring.
3. Visually check the IN3 terminal and reattach if necessary.
4. Flow switch fault 4. Electrically test to determine fault.
5. Incorrect setting of the SW3-2 5. Check the SW3-2 setting.
6. FTC4 board failure 6. Replace board.
OCH532A
55
Error code Title and display conditions Possible Cause Diagnosis and action
L9 Low primary circuit (Zone2 side) fl ow rate
detected by fl ow switch
* “3” is displayed in “Request code: 569” in “Run-
ning information”.
1. Insuffi cient system head 1. If more head required either add an pump
of the same size or replace existing pump.
2. Reduced fl ow in primary water circuit
Due to 1 or more of the following;
Faulty pump, insuffi cient air purge,
blocked strainer, leak in water circuit.
2. Check circulation pump (See 10-6. for how
to check).
Open purge valve to remove trapped air.
Check the strainer for blockages.
Check the primary water circuit for leaks.
Check that the flow amount is within the
recommended range.
3. Terminal wire has become detached
or loose wiring.
3. Visually check the IN7 terminal and reattach if necessary.
4. Flow switch fault 4. Electrically test to determine fault.
5. Incorrect setting of the SW3-3 5. Check the SW3-3 setting.
6. FTC4 board failure 6. Replace board.
LC Boiler circulation water temperature overheat
protection
<DHW/Heating/LP/FS/OS>
Error code displayed when THWB1 detects
a temp. ≥80ºC for 10 consecutive seconds or
THWB2 detects a temp. ≥80ºC for 10 consecutive seconds
1. The set temperature for Boiler is too
high.
1. Check if the set temperature for Boiler
for heating exceeds the restriction. (See
the manual for the thermistors "PACTH011HT-E")
2. Flow rate of the heating circuit from the
boiler may be reduced.
2. Check for
water leakage
strainer blockage
water circulation pump function.
•
•
•
LD Boiler temperature thermistor (THWB1, THWB2)
failure
Refer to error codes (P1/P2/L5/LD).
LE Boiler operation error
<Heating>
Boiler is running and THW6 detects a
temperature <30ºC for consecutive 60 minutes.
1. THW6 has become detached from its
holder.
1. Visually inspect location and reattach as
necessary.
2. Incorrect wiring between FTC4
(OUT10) and the boiler.
2. See the manual of the thermistors "PACTH011HT-E".
3. Boiler fuel has run out or the system is
OFF.
3. Check the status of the boiler.
4. Boiler failure 4. Check the status of the boiler.
5. FTC4 board failure 5. Replace board.
LH Boiler circulation water freeze protection Flow rate of the heating circuit from the
boiler may be reduced.
Check for
water leakage
strainer blockage
water circulation pump function.
•
•
•
LL Setting errors of Dip switches on FTC4 control
board
Incorrect setting of Dip switches.
1. Boiler operation 1. For boiler operation, check that Dip SW1-1
is set to ON (With Boiler) and Dip SW2-6 is
set to ON (With Mixing Tank).
2. 2-zone temperature control 2. For 2-zone temperature control, check Dip
SW2-7 is set to ON (2-zone) and Dip SW2-6
is set to ON (With Mixing Tank).
3. Multiple outdoor units control 3. For multiple outdoor units control, check Dip
SW1-3 is set to ON on FTC (slave) that runs
DHW operation .
P1 Indoor unit temperature thermistor (TH1A/TH1B)
failure
Refer to error codes (P1/P2/L5/LD).
P2 Indoor unit temperature thermistor (TH2) failure Refer to error codes (P1/P2/L5/LD).
P6
Anti-freeze protection of plate heat exchanger
<Cooling>
The error code displayed when Ref. liquid temp.
(TH2) stays at -5
ºC or lower for 10 seconds after
compressor operates for 6 minutes.
<Cooling>
1. Reduced water fl ow
1., 2.
Check water piping.
• Clogged fi lter
• Leakage of water
2. Low temperature
• Low load
• Inlet water is too cold.
3. Defective water pump 3. Check water pump.
4. Defective outdoor fan control. 4. Check outdoor fan motor.
5. Overcharge of refrigerant
5., 6.
Check operating condition of refrigerant circuit.
6. Defective refrigerant circuit (clogs)
7. Malfunction of linear expansion valve 7. Check linear expansion valve.
OCH532A
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Error code Title and display conditions Possible Cause Diagnosis and action
P6 <Defrosting>
THW2 detects a temperature ≤15ºC and TH2
detects a temperature ≤−16ºC for consecutive 10
seconds.
<Defrosting>
1. Reduced water fl ow
1., 2.
Check water piping.
• Clogged fi lter
• Leakage of water
2. Low temperature
• Low load
• Inlet water is cold
3. Defective water pump 3. Check water pump.
4. Leakage or shortage of refrigerant 4. Correct to proper amount of refrigerant.
5. Malfunction of linear expansion valve 5. Check linear expansion valve.
E0/E4 Main controller communication failure
(Reception error)
Error code E0 is displayed if main controller does
not receive any signal from the indoor unit for ref.
address "0" for 3 mins.
Error code E4 is displayed if indoor unit does not
receive any data from the main controller for 3
mins or indoor unit does not receive any signal
from the main controller for 2 mins.
1. Contact failure with transmission cable 1. Check connection cable for damage or
loose connections at the FTC4 and main
controller terminals.
2. Wiring procedure not observed.
(Cable length/cable diameter/number
of indoor units/number of main
controllers)
2. Check main controller and FTC4 common
wiring max cable length 500 m.
Only use 2 core cable.
Only connect 1 main controller to 1 FTC4
indoor unit board.
3. Fault on the indoor unit FTC4 board
section controlling Ref. address "0"
3. to 5.
If the problem is not solved by the above
measures then:
Turn the power to the indoor unit OFF and
then ON.
Power to both the indoor unit and outdoor
units should be switched OFF then ON.
(This may require switching 1 or 2 breakers
depending if the unit is powered independently from the outdoor unit).
If the E4 code is still displayed the FTC4
and/or the main controller circuit board
4. Fault with the main controller circuit
board
5. Electrical noise causes interference
with transmission/reception of data for
main controller.
E3/E5 Main controller communication failure
(Transmission error)
Error code E3 is displayed if the main controller
an not fi nd an empty transmission path and thus
fails to transmit for 6 secs or the data received
bythe main controller is different to what was sent
(by the main controller) 30 consecutive times.
Error code E5 is displayed if the FTC4 can not
fi nd an empty transmission path for 3 mins and
thus cannot transmit or the data sent by the FTC4
is different to what was expected 30 consecutive
times.
1. 2 or more main controllers have been
connected to the FTC4.
1. Only connect 1 main controller to 1 FTC4
indoor unit board.
2. Fault with main controller transmission/
receiving circuit board
2. to 4.
Turn the power to the indoor unit OFF and
then ON.
Power to both the indoor unit and outdoor
units should be switched OFF then ON.
(This may require switching 1 or 2 breakers
depending if the unit is powered independently from the outdoor unit).
If the E3/E5 code is still displayed the FTC4
and/or the main controller circuit board
3. Fault with the main controller circuit
board
4. Electrical noise causes interference
with transmission/reception of data for
main controller.
E6 Indoor/outdoor communication failure
(Reception error)
Error code E6 is displayed if after the power is
switched ON to the indoor unit, the FTC4 board
does not receive any signal or the signal receivedis not complete for 6 mins, or after a period of
operation the FTC4 board does not receive any
signal or the signal received is not complete for 3
mins.
* Check the LED display on the outdoor unit
circuit board.
(Connect the A-control service tool, PACSK52ST to test.) Refer to the outdoor unit
service manual for explanation of EA-EC
codes.
1. Contact failure/short circuit/miswiring 1. Check the connections on the indoor and
outdoor units have not become loose and
that the connecting cable is not damaged.
2. Fault with outdoor unit transmission/
receiving circuit board
2. to 4.
Turn the power to the indoor unit OFF and
then ON.
Power to both the indoor unit and outdoor
units should be switched OFF then ON.
(This may require switching 1 or 2 breakers
depending if the unit is powered independently from the outdoor unit).
If the E6 code is still displayed the FTC4
and/or the outdoor unit circuit board should
be replaced.
3. Fault with FTC4 transmission/receiving
circuit board
4. Electrical noise causes interference
with FTC4-Outdoor unit transmission
cable.
E7 Indoor/outdoor communication failure
(Transmission error)
Error code E7 is displayed if despite the FTC4
board sending signal "0", signal "1" is received
30 consecutive times.
1. Fault with FTC4 transmission/receiving
circuit board
1. to 3.
Turn the power to the indoor unit OFF and
then ON.
Power to both the indoor unit and outdoor
units should be switched OFF then ON.
(This may require switching 1 or 2 breakers
depending if the unit is powered independently from the outdoor unit).
If the E7 code is still displayed the FTC4
circuit board should be replaced.
2. Electrical noise causes interference
with power supply.
3. Electrical noise causes interference
with FTC4-outdoor unit transmission
cable.
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Error code Title and display conditions Possible Cause Diagnosis and action
E1/E2
Main controller control board failure
Error code E1 displayed if main controller can not
access it's non volatile (non power dependent)
memory.
Error code E2 is displayed when there is a fault
with the main controller's internal clock.
1. Fault with the main controller circuit
board
1. Replace main controller circuit board.
J0 Indoor unit/wireless receiver communication
failure
Error code J0 is displayed when the FTC4 can
not receive data from the wireless receiver for 1
min.
1. Connection fault with wireless receiverFTC4 connection
1. Check the connections to the wireless receiver and FTC4 have not become loose
and that the connecting cable is not damaged.
2. Fault with FTC4 receiving circuit board 2. to 4.
Turn the power to the indoor unit OFF and
then ON.
Power to both the indoor unit and outdoor
units should be switched OFF then ON.
(This may require switching 1 or 2 breakers
depending if the unit is powered independently from the outdoor unit).
If the J0 code is still displayed the FTC4
and/or the wireless receiver circuit board
should be replaced.
3. Fault with wireless receiver's transmis-
sion circuit board
4. Electrical noise causes interference
with wireless receiver communication
cable.
J1 to J8 Wireless remote controller/wireless receiver
communication failure
(Reception error)
Error code displayed if wireless receiver receives
no/incomplete data from the wireless remote
controller for 15 consecutive minutes.
The digit after the J refers to the address of the
wireless remote controller that has the error.
E.g. Error code "J3" refers to a communication
fault between the wireless receiver and wireless
remote control with address 3.
1. Battery on wireless remote control may
be fl at
1. Check and replace the battery if necessary
the wireless remote controller battery.
2. The wireless remote controller is out of
range of the wireless receiver.
2. to 4.
Reposition the wireless remote control closer
to the receiver and perform a communication
test.
For procedure refer to wireless remote
controller installation manual.
If "OK" is displayed then the cause of the
J1 to J8 error was the controller was out of
range of the receiver.
The wireless remote controller should be
installed within range of the receiver.
If "Err" is displayed replace wireless remote
controller with a new controller and perform
the pairing procedure.
If after this procedure the "Err" code is still
displayed the fault is with the receiver unit
(attached to the indoor unit).
The receiver unit should be replaced with a
new part and the original remote control can
be reconnected.
If "OK" is displayed then the fault is with the
remote control and this should be replaced.
3. Fault with wireless remote controller
transmission circuit board
4. Fault with wireless receiver's reception
circuit board
J9 Main controller communication failure
Error code J9 is displayed when signal is not
received normally from FTC4 (slave) for 3 mins.
Refer to error codes (E0 and E4)
Note: To cancel error codes please switch system off (press button F4 (RESET) on main controller).
OCH532A
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10-5. Troubleshooting by inferior phenomena
No. Fault symptom Possible cause Explanation - Solution
1 Main controller display
is blank.
1. There is no power supply to main
controller.
1. Check LED2 on FTC4. (See <Figure 5.2.1 in installation manual>.)
(i) When LED2 is lit.
Check for damage or contact failure of the main controller wiring.
(ii) When LED2 is blinking.
Refer to No. 5 below.
(iii) When LED2 is not lit.
Refer to No. 4 below.
2. Power is supplied to main controller,
however, the display on the main
controller does not appear.
2. Check the following:
• Disconnection between the main controller cable and the FTC4 control board
• Failure of the main controller if “Please Wait” is not displayed.
• Refer to No. 2 below if “Please Wait” is displayed.
2 “Please Wait” remains
displayed on the main
controller.
1. "Please Wait" is displayed for up to 6
minutes.
1. Normal operation.
2. Communication failure between the main
controller and FTC4.
2, 3.
Main controller start up checks/procedure.
(i) If “0%” or “50-99%” is displayed below "Please Wait" there is a
communication error between the main controller and the FTC4 control
board.
• Check wiring connections on the main controller.
• Replace the main controller or the FTC4 control board.
(ii) If “1-49%” is displayed there is a communication error between the outdoor
unit's and FTC4's control boards.
• Check the wiring connections on the outdoor unit control board and the FTC4
control board.
(Ensure S1 and S2 are not cross-wired and S3 is securely wired with no
damage. (See section 4.5. in installation manual)
• Replace the outdoor unit's and/or the FTC4's control boards.
3. Communication failure between FTC4
and outdoor unit.
3 The main screen
appears with a press
of the “ON” button, but
disappears in a second.
The main controller operations do not work
for a while after the settings are changed in
the service menu. This is because the system
takes time to apply the changes.
Normal operation.
The indoor unit is applying updated settings made in the service menu. Normal
operation will start shortly.
4 LED2 on FTC4 is off.
(See <Figure 5.2.1 in
installation manual>.)
When LED1 on FTC4 is also off. (See <Figure
5.2.1 in installation manual>.)
<FTC4 powered via outdoor unit.>
1. The outdoor unit is not supplied at the
rated voltage.
1. Check the voltage across the terminals L and N or L3 and N on the outdoor
power board. (See section 4.5. in installation manual)
• When the voltage is not 220 to 240V AC, check wiring of the outdoor unit and
of the breaker.
• When the voltage is at 220 to 240V AC, go to “2.” below.
2. Defective outdoor controller circuit board. 2. Check the voltage across the outdoor unit terminals S1 and S2. (See section 4.5.
in installation manual)
• When the voltage is not 220 to 240V AC, check the fuse on the outdoor
control board and check for faulty wiring.
• When the voltage is 220 to 240V AC, go to “3.” below.
3. FTC4 is not supplied with 220 to 240V
AC.
3. Check the voltage across the indoor unit terminals S1 and S2. (See section 4.5.)
• When the voltage is not 220 to 240V AC, check FTC4-outdoor unit wiring for
faults.
• When the voltage is 220 to 240V AC, go to “4.” below.
4. FTC4 failure. 4. Check the FTC4 control board.
• Check the fuse on FTC4 control board.
• Check for faulty wiring.
• If no problem found with the wiring, the FTC4 control board is faulty.
5. Faulty connector wiring. 5. Check the connector wiring.
• When the connectors are wired incorrectly, re-wire the connectors referring to
below. (See section 4.5. in installation manual)
S1
S2
S3
L
N
CN01
CN01
FTC4 powered
via outdoor unit
Black
Hydrobox
control board
BLACK
YELLOW
YELLOW
BLACK
OCH532A
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No. Fault symptom Possible cause Explanation - Solution
4 LED2 on FTC4 is off.
(See Figure <5.2.1 in
installation manual>)
<FTC4 powered on independent source>
1. FTC4 is not supplied with 220 to 240V AC. 1. Check the voltage across the L and N terminals on the indoor power supply
terminal block. (See section 4.5. in installation manual)
• When the voltage is not 220 to 240V AC, check for faulty wiring to power
supply.
• When the voltage is 220 to 240V AC, go to 2. below.
2. There are problems in the method of
connecting the connectors.
2. Check for faulty wiring between the connectors.
• When the connectors are wired incorrectly re-wire them correctly referring
to below. (See section 4.5 in installation manual and a wiring diagram on
the control and electrical box cover.)
L
N
CN01
CN01
S1
S2
S3
• If no problem found with the wiring, go to 3. below.
3. FTC4 failure. 3. Check the FTC4 control board.
• Check the fuse on FTC4 control board.
• Check for faulty wiring.
• If no problem found with the wiring, the FTC4 control board is faulty.
When LED1 on FTC4 is lit. Recheck the refrigerant address setting on the outdoor unit.
Set the refrigerant address to “0”.
(Set refrigerant address using SW1(3 - 6) on outdoor controller circuit board.)
Incorrect setting of refrigerant address for
outdoor unit.
(None of the refrigerant address is set to "0".)
5 LED2 on FTC4 is
blinking.
(See Figure <5.2.1 in
installation manual>)
When LED1 is also blinking on FTC4 . Check for faulty wiring between FTC4 and outdoor unit.
Faulty wiring between FTC4 and outdoor
unit
When LED1 on FTC4 is lit.
1. Faulty wiring in main controller
Multiple indoor units have been wired to a
single outdoor unit.
1. Check for faulty wiring in main controller.
The number of indoor units that can be wired to a single outdoor unit is one.
Additional indoor units must be wired individually to a single outdoor unit.
2. Short-circuited wiring in main controller
2.,3.
Remove main controller wires and check LED2 on FTC4. (See Figure 5.2.1.
in installation manual)
• If LED2 is blinking check for short circuits in the main controller wiring .
• If LED2 is lit, wire the main controller again and:
- if LED2 is blinking, the main controller is faulty;
- if LED2 is lit, faulty wiring of the main controller has been corrected.
3. Main controller failure
6 LED4 on FTC4 is off.
(See fi gure <5.2.1>
in installation manual)
1. SD memory card is NOT inserted into the
memory card slot with correct orientation.
1. Correctly insert SD memory card in place until a click is heard.
2. Not an SD standards compliant memory card. 2. Use an SD standards compliant memory card. (Refer to section 5.6. in instal-
lation manual)
LED4 on FTC4 is
blinking.
(See Figure <5.2.1>
in installation manual)
1. Full of data. 1. Move or delete data, or replace SD memory card with a new one.
2. Write-protected. 2. Release the write-protect switch.
3. NOT formatted. 3. Refer to "5.6 Using SD memory card" in installation manual.
4. Formatted in NTFS fi le system. 4. FTC4 is Not compatible with NTFS fi le system. Use an SD memory card for-
matted in FAT fi le system.
7 No water at hot tap. 1. Cold main off 1. Check and open stop cock.
2. Strainer (fi eld supply) blocked. 2. Isolate water supply and clean strainer.
8 Cold water at tap. 1. Hot water run out. 1. Ensure DHW mode is operating and wait for DHW tank to re-heat.
2. Prohibit, schedule timer or holiday mode se-
lected.
2. Check settings and change as appropriate.
3. Heat pump not working. 3. Check heat pump – consult outdoor unit service manual.
4. Booster heater cut-out trip
ped
. 4. Check booster heater thermostat and press reset button if safe.
Reset button is located on the side of booster heater, covered with white rubber cap. See 4. PART NAMES AND FUNCTIONS to fi nd out its position.
5.
The earth leakage circuit breaker for booster
heater breaker (ECB1) tripped.
5. Check the cause and reset if safe.
6. The booster heater thermal cut-out has
tripped and cannot be reset using the manual
reset button.
6. Check resistance across the thermal cut-out, if open then the connection is
broken and the booster heater will have to be replaced.
Contact your Mitsubishi Electric dealer.
7. Immersion heater cut-out tripped. 7. Check immersion heater thermostat and press reset button, located on immersion heater boss, if safe. If the heater has been operated with no water
inside it may have failed, so please replace it with a new one.
8.
Immersion heater breaker (ECB2) tripped.
8. Check the cause and reset if safe.
9. 3-way valve fault 9. Check plumbing/wiring to 3-way valve.
(i) Manually override 3-way valve using the main controller. (Refer to <Man-
ual operation> in section 9-2.) If the valve does not still function, go to (ii)
below.
(ii) Replace 3-way valve.
Black
Hydrobox
control board
YELLOW
YELLOW
BLACK
FTC4 powered
from independent
source
BLACK
OCH532A
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No. Fault symptom Possible cause Explanation - Solution
9 Water heating takes
longer.
1. Heat pump not working. 1. Check heat pump – consult outdoor unit service manual.
2. Booster heater cut-out tripped. 2. Check booster heater thermostat and press reset button if safe.
Reset button is located on the side of booster heater, covered with white rubber cap. See 4. PART NAMES AND FUNCTIONS to fi nd out its position.
3.
Booster heater breaker (ECB1) tripped.
3. Check the cause and reset if safe.
4. The booster heater thermal cut-out has
tripped and cannot be reset using the manual
reset button.
4. Check resistance across the thermal cut-out, if open then connection is broken and the booster heater will have to be replaced.
Contact your Mitsubishi Electric dealer.
5. Immersion heater cut-out has been triggered. 5. Check immersion heater thermostat and press reset button if safe. If the
heater kept running with no water inside, this may have resulted in failure, so
replace it with a new one.
6.
Immersion heater breaker (ECB2) tripped.
6. Check the cause and reset if safe.
10 Temperature of DHW
tank water dropped.
When DHW operation is not running, the DHW
tank emits heat and the water temperature
decreases to a certain level. If water in the DHW
tank is reheated frequently because of a signifi -
cant drop in water temperature, check for the
following.
1. Water leakage in the pipes that connect to
the DHW tank
1. Take the following measures.
• Retighten the nuts holding the pipes onto the DHW tank.
• Replace seal materials.
• Replace the pipes.
2. Insulation material coming loose or off. 2. Fix insulation.
3. 3-way valve failure 3. Check plumbing/wiring to 3-way valve.
(i) Manually override 3-way valve using the main controller. (Refer to <Manual
operation> in section 9-2.) If the valve does not still function, go to (ii) below.
(ii) Replace 3-way valve.
11 Hot or warm water
from cold tap.
Heat of hot water pipe is transferred to cold water
pipe.
Insulate/re-route pipework.
12 Water leakage 1. Poorly sealed connections of water circuit
components
1. Tighten connections as required.
2. Water circuit components reaching the end of
life
2. Refer to PARTS CATALOG in the service manual for expected part lifetimes
and replace them as necessary.
13 Heating system does
not reach the set
temperature.
1. Prohibit, schedule timer or holiday mode selected.
1. Check settings and change as appropriate.
2. Check settings and change as appropriate. 2. Check the battery power and replace if fl at.
3. The temperature sensor is located in a room
that has a different temperature relative to
that of the rest of the house.
3. Relocate the temperature sensor to a more suitable room.
4. Heat pump not working. 4. Check heat pump – consult outdoor unit service manual.
5. Booster heater cut-out tripped. 5. Check booster heater thermostat and press reset button if safe.
Reset button is located on the side of booster heater, covered with white rubber cap. (See 4. PART NAMES AND FUNCTIONS for position.)
6.
Booster heater breaker (ECB1) tripped.
6. Check the cause of the trip and reset if safe.
7. The booster heater thermal cut-out tripped
and can not be reset using the manual reset
button.
7.
Check resistance across the thermal cut-out, if open then the connection is broken and the booster heater will have to be replaced.
Contact your Mitsubishi Electric dealer.
8. Incorrectly sized heat emitter. 8. Check the heat emitter surface area is adequate
Increase size if necessary.
9. 3-way valve failure 9. Check plumbing/wiring to 3-way valve.
10. Battery problem (*wireless control only) 10. Check the battery power and replace if fl at.
11. If a mixing tank is installed, the fl ow rate be-
tween the mixing tank and the hydrobox is
less than that between the mixing tank and
the local system.
11. Increase the fl ow rate between the mixing tank and the hydrobox decrease
that between the mixing tank and the local system.
OCH532A
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No. Fault symptom Possible cause Explanation - Solution
14 In 2-zone tempera-
ture control, only
Zone2 does not
reach the set temperature.
1. When Zone1 and Zone2 are both in heating
mode, the hot water temperature in Zone2
does not exceed that in Zone1.
1. Normal action no action necessary.
2. Faulty wiring of motorized mixing valve 2. Refer to "5.3 Wiring for 2-zone temperature control" in installation manual.
3. Faulty installation of motorized mixing valve 3. Check for correct installation. (Refer to the manual included with each mo-
torized mixing valve.)
4. Incorrect setting of Running time 4. Check for correct setting of Running time.
5. Motorized mixing valve failure 5. Inspect the mixing valve. (Refer to the manual included with each motorized
mixing valve.)
15 When a PUHZ-
FRP outdoor unit is
connected, DHW or
Heating operation
cannot run.
The outdoor unit is set to have operation of the
indoor unit of air conditioner take precedence
over that of the hydrobox, and in the main controller settings "Electric heater (Heating)" or "Electric
heater (DHW)" is turned off.
Turn ON Electric heater (Heating) or Electric heater (DHW) using the main controller.
16 When a PUHZ-FRP
outdoor unit is connected and is in heat
recovery operation,
the set temperature
is not reached.
When the outdoor unit is set to have cooling
operation of the indoor unit of air conditioner take
precedence over that of the hydrobox, the outdoor
unit controls the frequency of the compressor
according to the load of air conditioner. The DHW
and heating run according to that frequency.
Normal operation no action necessary.
If Air-to-Water system is given priority in operation, comp Hz can be regulated
depending on the load of DHW or Heating. For more details, refer to the PUHZFRP installation manual.
17 After DHW operation
room temperature
rises slightly.
At the end of the DHW mode operation the 3-way
valve diverts hot water away from the DHW circuit
into space heating circuit.
This is done to prevent the hydrobox components
from overheating.
The amount of hot water directed into the space
heating circuit varies according to the type of the
system and of the pipe run between the plate heat
exchanger and the hydrobox.
Normal operation no action necessary.
18
The room temperature rises during DHW
operation.
3-way valve failure Check the 3-way valve.
19 Water discharges
from pressure relief
valve.
(Primary circuit)
1. If continual – pressure relief valve may be
damaged.
1. Turn the handle on the pressure relief valve to check for foreign objects in it.
If the problem is not still solved, replace the pressure relief valve with a new
one.
2. If intermittent – expansion vessel charge may
have reduced/bladder perished.
2. Check pressure in expansion vessel.
Recharge to 1 bar if necessary.
If bladder perished replace expansion vessel with a new one.
20 Water discharges
from pressure relief
valve (fi eld supplied
item).
(Sanitary circuit)
1.
If continual – field supplied pressure reducing
valve not working.
1.
Check function of pressure reducing valve and replace if necessary.
2. If continual – pressure relief valve seat may
be damaged.
2. Turn the handle on the pressure relief valve to check for foreign objects inside. If the problem is not still solved, replace the pressure relief valve.
3. If intermittent – expansion vessel charge may
have reduced/bladder perished.
3. Check gas-side pressure in expansion vessel.
Recharge to correct precharge pressure if necessary.
If bladder perished replace expansion vessel with a new one with appropriate
pre-charge.
4. DHW tank may have subjected to backfl ow. 4. Check the pressure in DHW tank. If pressure in DHW tank is similar to that in
the incoming mains, cold water supply that merges with incoming mains water supply could fl ow back to DHW tank. Investigate source of back-feed and
rectify error in pipework/fi tting confi guration. Adjust pressure in cold supply.
21 Noisy water circula-
tion pump
Air in water circulation pump . Use manual and automatic air vents to remove air from system.
Top up water if necessary to achieve 1 bar on primary circuit.
22 Noise during hot
water draw off
typically worse in the
morning.
1. Loose airing cupboard pipework. 1. Install extra pipe fastening clips.
2. Heaters switching on/off. 2. Normal operation no action necessary.
23 Mechanical noise
heard coming from
the hydrobox.
1. Heaters switching on/off. Normal operation no action necessary.
2.
3-way valve changing position between DHW and
heating mode.
24 Water circulation
pump runs for a
short time unexpectedly .
Water circulation pump jam prevention mechanism
(routine) to inhibit the build-up of scale.
Normal operation no action necessary.
25 Milky/Cloudy water
(Sanitary circuit)
Oxygenated water Water from any pressurised system will release oxygen bubbles when water is
running. The bubbles will settle out.
26
Heating mode has
been on standby for
a long time (does
not start operation
smoothly.)
The time of “Delay” set in “Economy settings
for pump” is too short. (Go to “Service menu”
→ “Auxiliary settings” → “Economy settings for
pump”).
Increase the time of “Delay” in “Economy settings for pump” .
OCH532A
62
No. Fault symptom Possible cause Explanation - Solution
27
The hydrobox that
was running in the
heating mode before
power failure is
running in the DHW
mode after power
recovery.
The hydrobox is designed to run in an operation
mode with a higher priority (i.e. DHW mode in this
case) at power recovery.
• Normal operation.
• After the DHW max. operation time has elapsed or the DHW max. temperature
has been reached, the DHW mode switches to the other mode (ex. Heating
mode).
28
Cooling mode is NOT
available.
Dip SW2-4 is OFF. Turn Dip SW2-4 to ON. (Refer to “6-9 Dip switch settings” in this manual.)
29
The cooling system
does not cool down to
the set temperature.
1. When the water in the circulation circuit is unduly hot, Cooling mode starts with a delay for
the protection of the outdoor unit.
1. Normal operation.
2. When the outdoor ambient temperature is
lower than the preset temperature that activates the freeze stat. function, Cooling mode
does not start running.
2. To run Cooling mode overriding the freeze stat. function, adjust the preset
temperature that activates the freeze stat. function.
(Refer to "<Freeze stat function>" on Page 37.)
30
The electric heaters
are activated shortly
after DHW or LP
mode starts running
after Cooling mode.
The setting time period of Heat-pump-only operation is short.
Adjust the setting time period of Heat-pump only operation. (Refer to “<Electric
heater (DHW)> on Page 36.
31
During DHW or LP
mode following the
cooling mode, error
L6 (circulation water
freeze protection
error ) occurs and the
system stops all the
operations.
The unit runs in Cooling mode when the outdoor
ambient temperature is lower than 10ºC (outside
of the guaranteed operating range).
(When defrosting operation is running at such a
low outdoor ambient temperature after Cooling
mode is switched to DHW or LP mode, the water
temperature in the cooling circuit drops too low,
which could result in L6 error to stop all the operations.
Do not run Cooling operation when the outdoor ambient temperature is lower
than 10ºC.
To automatically stop or recover only Cooling operation and keep other operations running, the freeze stat. function can be used. Set the preset temperature
that activates the freeze stat. function to adjust the outdoor ambient temperature
as follows. (Refer to "<Freeze stat function>" on Page 37.)
Outdoor ambient temperature Cooling operation
3ºC higher than the preset temperature Stop
5ºC higher than the preset temperature Recover
Annual Maintenance
It is essential that the hydrobox is serviced at least once a year by a qualifi ed individual any spare parts required MUST be purchased from Mitsubishi Electric (safety
matter).
NEVER bypass safety devices or operate the unit without them being fully operational.
<Draining the hydrobox>
WARNING: DRAINED WATER MAY BE VERY HOT
1. Before attempting to drain the hydrobox isolate from the electrical supply to prevent booster heater burning out.
2. Isolate hydrobox from primary water circuit and drain water from hydrobox. Use a suitable heat resistant hose to assist in these operations.
3. Drain any remaining water from booster heater using fi tted drain cock and hose to safely drain the unit.
4. After the hydrobox is drained, water remains in the following component parts. Drain water completely by checking the inside of the parts.
• Strainer (Remove the strainer cover.)
• Pressure relief valve (Operate the valve.)
<Annual maintenance points>
Use the Annual Maintenance Log Book as a guide to carrying out the necessary checks on the hydrobox and outdoor unit.
OCH532A
10-6. Checking Component Parts' Function
Part Name Check Points
L
Signal cable
3
3
Power cable
BROWN
PWM input signal
Feedback signal
Signal ref.
BLUE
BROWN
GREEN/
YELLOW
BLUE
BLACK
M
1~
N
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
80.0
0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
80.0
0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
80.0
0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
80.0
0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0
EHSC, ERSC series
EHPX series * (with PUHZ-W50)
External static pressure [kPa]
Flow rate [L/min]
* For installation of EHPX series, set its pump speed with a pressure drop between the
hydrobox and the outdoor unit factored into the external static pressure.
Speed 5 (Default)
Speed 4
Speed 3
Speed 2
Speed 1
External static pressure [kPa]
Speed 5 (Default)
Speed 4
Speed 3
Speed 2
Speed 1
Speed 5 (Default)
Speed 4
Speed 3
Speed 2
Speed 1
Flow rate [L/min]
Flow rate [L/min]
Flow rate [L/min]
EHPX series * (with PUHZ-W85)
EHPX series * (with PUHZ-HW112/140)
External static pressure [kPa]
External static pressure [kPa]
Speed 5 (Default)
Speed 4
Speed 3
Speed 2
Speed 1
63
Outdoor heat pump unit Water fl ow rate range [L/min]
Packaged PUHZ-W50 7.1 - 14.3
PUHZ-W85 10.0 - 25.8
PUHZ-HW112 14.4 - 27.7
PUHZ-HW140 17.9 - 27.7
Split PUHZ-RP35 7.1 - 11.8
PUHZ-RP50 7.1 - 17.2
PUHZ-RP60 8.6 - 20.1
PUHZ-(H)RP71 10.2 - 22.9
PUHZ-(H)RP100 14.4 - 27.7
PUHZ-(H)RP125 17.9 - 27.7
PUHZ-RP140 20.1 - 27.7
PUHZ-SW40 7.1 - 11.8
PUHZ-SW50 7.1 - 17.2
PUHZ-SW75 10.2 - 22.9
PUHZ-SW100 14.4 - 27.7
PUHZ-SW120 20.1 - 27.7
PUHZ-SHW80 10.2 - 22.9
PUHZ-SHW112 14.4 - 27.7
PUHZ-SHW140 17.9 - 27.7
<Recommended water fl ow rate range>
<Water Circulation Pump Characteristics>
* If the water fl ow rate is less than 7.1 L/min, the fl ow switch will be
activated.
If the water flow rate exceeds 27.7 L/min, the flow speed will be
greater than 1.5 m/s, which could erode the pipes.
OCH532A
64
Part Name Check Points
Earth leakage circuit breaker for heater If a short circuit occurs on the booster heater, immersion heater, or each power line, a
short-circuit breaker will trip and power source will be blocked.
Eliminate the causes of short circuit and then turn on the breaker again.
Relay for heater
R S T A1 A2
U V W
When the applied voltage is not 230V AC across the terminals A1-A2, check the terminals
R-U, S-V, and T-W are open.
When the applied voltage is 230V AC across the terminals A1-A2, check the terminals
R-U, S-V, and T-W are short.
Booster heater Measure the resistance between the terminals with a tester.
Thermostat (90 °C) and thermal cut out (121 °C)
90 °C
Manual reset
water
thermostat
121 °C
Thermal
cut-out
AWG18
AWG18
9
10
Terminal Normal Abnormal
9-10 110(±35)mΩ Open or Short
2kW heater (230V, 1 phase)
1
2
2kW
AWG15 FEP
WHITE
AWG15 FEP
WHITE
Terminal Normal Abnormal
1-2 26.5(+3/-1.3)Ω Open or Short
2 + 4kW heater (230V, 1 phase)
1
2
2kW
AWG15 FEP
WHITE
AWG15 FEP
WHITE
3
4
2kW
AWG13 FEP
BLUE
AWG13 FEP
BLUE
2kW
Terminal Normal Abnormal
1-2 26.5(+3/-1.3)Ω Open or Short
3-4 13.3(+1.5/-0.6)Ω Open or Short
3 + 6kW heater (400V, 3 phase)
Terminal Normal Abnormal
1-2=2-3=1-3 105.8(+11.8/-5)Ω Open or Short
4-5=5-6=4-6 52.9(+5.8/-2.5)Ω Open or Short
3 + 6kW heater (230V, 3 phase)
Terminal Normal Abnormal
1-2=2-3=3-1
35.3(+3.9/-1.8)Ω Open or Short
4-5=5-6=6-4 17.6(+1.9/-0.9)Ω Open or Short
56
AWG13 FEP
BLUE
AWG13 FEP
BLUE
AWG15 FEP
WHITE
4
AWG13 FEP
BLUE
2kW 2kW
231
1kW 1kW
AWG15 FEP
WHITE
AWG15 FEP
WHITE
2kW
1kW
56
AWG13 FEP
BLUE
AWG13 FEP
BLUE
AWG15 FEP
WHITE
2kW
4
AWG13 FEP
BLUE
2kW 2kW
23
1kW
1
1kW 1kW
AWG15 FEP
WHITE
AWG15 FEP
WHITE
OCH532A
Flow
1
2
3
Thermistor Normal Abnormal
TH1
4.3 - 9.5 kΩ Open or short
TH2
THW1
THW2
THW5
THW6
THW7
THW8
THW9
THWB1
40 - 100 kΩ Open or short
THWB2
65
Part Name Check Points
Flow switch Measure the resistance between the terminals with a tester.
State of moving part Normal Abnormal
Paddle vertical (Flow < 5.5 l/min) Open Other than open
Paddle inclined (Flow > 5.5 l/min) Short Other than short
Thermistors Disconnect the connector then measure the resistance with a tester.
(At ambient temperatures of 10 - 30°C.)
OCH532A
0
10
20
30
40
50
-20-100 1020304050
Temperature ()
Resistance (k)
0
100
200
300
400
500
600
700
800
900
1000
-30 -20 -10 0 10 20 30 40 50 60 70 80
Temperature (°C)
Resistance (kΩ)
66
• Boiler flow water temperature thermistor (THWB1)
• Boiler return water temperature thermistor (THWB2)
<Thermistor Characteristics Charts>
• Room temperature thermistor (TH1)
• Liquid refrigerant temperature thermistor (TH2)
• Flow water temperature thermistor (THW1)
• Return water temperature thermistor (THW2)
• DHW tank temperature thermistor (THW5)
• Zone 1 fl ow water temperature thermistor (THW6)
• Zone 1 return water temperature thermistor (THW7)
• Zone 2 fl ow water temperature thermistor (THW8)
• Zone 2 return water temperature thermistor (THW9)
0°C 15kΩ
10°C 9.6kΩ
20°C 6.3kΩ
25°C 5.2kΩ
30°C 4.3kΩ
40°C 3.0kΩ
Thermistor R0 = 15kΩ ± 3%
B constant = 3480 ± 2%
Rt = 15exp {3480 (
273+t
–
273
)}
11
0°C 162.8kΩ
10°C 97.4kΩ
20°C 60.3kΩ
25°C 48.1kΩ
30°C 38.6kΩ
40°C 25.4kΩ
50°C 17.1kΩ
60°C 11.9kΩ
70°C 8.4kΩ
80°C 6.0kΩ
Thermistor R100 = 3.3kΩ ± 2%
B constant = 3970 ± 1%
Rt = 3.3exp {3970 (
273+t
–
273
)}
11
OCH532A
10-7. Test point diagram
FTC4 (Controller board)
67
CN3C
Transmission
(Indoor/Outdoor)
(0 - 24V DC)
CNW5
Thermistor
(DHW tank water temp.)
LED3
Transmission
(Indoor/Outdoor)
CNP1/OUT1 (TBO.1 3-4)
Water circulation pump1
(230V AC)
F2
6.3A/250V
CN01
Power supply
(230V AC)
F1
6.3A/250V
CNPWM
Water circulation
pump 1
(2 - 3: 5V DC)
OUT12 (TBO.2 3-4)
Signal output (Defrost) (230V AC)
OUT8 (TBO.2 11-12)
Signal output for booster heater 2+
(230V AC)
CNIH/OUT9 (TBO.2 9-10)
Signal output for immersion
heater
(230V AC)
CNBHT/BHT (TBO.2 13-14)
Thermostat input for
booster heater
IN7
(TBI.1 13-14)
Flow switch 3
input
CN22/RC(TBI.2 13-14)
Main controller
(10.4 - 13.7 V DC)
CNRF
Transmission (Indoor/
Wireless receiver)
(1-2: 11.5 - 13.2 V DC)
LED1
Power supply
(FTC4)
CN108
SD card
LED4
Reading or writing
data to SD card
LED2
Power supply
(Main controller)
3
412
907
8
563
4
1
2
3
4
1
2
907
856
3
412
THW9
(TBI.2 11-12)
Thermistor
(Zone2 return
water temp. )
THW7
(TBI.2 9-10)
Thermistor
(Zone1 return
water temp. )
THW6
(TBI.2 7-8)
Thermistor
(Zone1 flow
water temp. )
THWB2
(TBI.2 5-6)
Thermistor
(Boiler return
water temp.)
THWB1
(TBI.2 3-4)
Thermistor
(Boiler flow
water temp.)
THW8
(TBI.2 1-2)
Thermistor
(Zone2 flow
water temp. )
IN6
(TBI.1 11-12)
Room thermostat 2 input
IN5
(TBI.1 9-10)
Outdoor thermostat input
IN4
(TBI.1 7-8)
Demand
control input
IN3
(TBI.1 5-6)
Flow switch
2 input
IN1
(TBI.1 1-2)
Room thermostat 1 input
CN20
Thermistor
(Room temperature)
CN2F/IN2
(TBI.1 3-4)
Flow switch 1 input
CNBC
Signal output for booster heater
protection (230V AC)
3
4
1
2
9
0
3
4
1
2
OUT11 (TBO.2 1-2)
Signal output (Error) (230V AC)
3
4
1
2
7
8
5
6
OUT5 (TBO.1 12-14)
Mixing valve (Field supply)
(12-13[Open]: 230VAC)
(13-14[Close]: 230VAC)
3
4
1
2
9
0
CNV1/OUT4 (TBO.1 9-11)
3-way valve/2-way valve1
(9-10: 230V AC)
OUT3 (TBO.1 7-8)
Water circulation pump3
(Field supply) (230V AC)
OUT2 (TBO.1 5-6)
Water circulation pump2
(Field supply) (230V AC)
OUT10 (TBO.1 1-2)
Signal output (Boiler)
(non-voltage contact)
CN21
Thermistor (Ref. liquid temp.)
CNW12
Thermistor
(1-2: Flow water temp.)
(3-4: Return water temp.)
CNBH
Signal output for booster heater
(1-3: heater1 230V AC)
(5-7: heater2 230V AC)
OUT13 (TBO.2 7-8)
2-way valve2
(230V AC)
7
8
OCH532A
68
11
DISASSEMBLY PROCEDURE
<Preparation for the repair service>
● Prepare the proper tools.
● Prepare the proper protectors.
● Provide adequate ventilation.
● After stopping the operation of the cylinder and outdoor unit, turn off the power-supply breaker and remove the
power plug.
● Discharge the condenser before the work involving the electric parts.
● Allow parts to cool.
● Do not expose the electric parts to water.
● When replacing or servicing water circuit parts, drain system first.
EHSC-VM2B, EHSC-VM6B, EHSC-YM9B, EHSC-TM9B, EHSC-VM6EB, EHSC-YM9EB,
EHPX-VM2B, EHPX-VM6B, EHPX-YM9B, ERSC-VM2B
Check individual illustrations and positions of the parts by referring to the parts catalog included in this manual.
Some lead wires and pipes are bundled with Bands. Cut the bands to undo the fastened pipes and lead wires if necessary.
When bundling the lead wires and pipes again, use new commercially available bands.
When removing the parts associated with water pipe work, drain the hydrobox as necessary. (Refer to "Draining the Hydrobox"
on page 30.)
When draining the hydrobox, keep water from splashing on the internal parts (mainly electric parts and insulations).
DISASSEMBLY PROCEDURE
PHOTOS & ILLUSTRATION
Photo 1-1
Photo 1-2
Photo 2-1
Figure 2-1
1. How to remove the front panel
(1) Remove the 2 screws at the bottom of the hydrobox. (Photo 1-1)
(2) Slightly lift and pull out the front panel from the hydrobox. (Photo
1-1)
(3) Disconnect the relay connector connecting from the main
controller. (Photo 1-2)
2. How to remove the main controller
(1) Remove the front panel. (Refer to Procedure 1).
(2) Turn the front panel over and remove the 4 screws retaining the
controller support. (Photo 2-1)
(3) Remove the main controller from the case while moving up the
claw at the top of the case. (Figure 2-1)
Screws
Front panel
Main controller
Connector
Front panel
Screws
Controller support
OCH532A
69
DISASSEMBLY PROCEDURE
PHOTOS
Photo 3-3
3. How to remove the electrical parts
(Steps (1) through (3) are applied to all the following parts.)
(1) Remove the front panel. (Refer to Procedure 1).
(2) Remove the 4 screws holding the control box cover.
(Photo 3-1)
(3) Slightly lift and pull out the control box cover. (Photo 3-1)
<Earth leakage circuit breaker> (Photo 3-2)
(4) Disconnect all the lead wires from the earth leakage cir-
cuit breaker.
(5) Remove the 2 screws on the earth leakage circuit break-
er.
Note: To avoid dropping of the breaker, hold the breaker by
hand when removing the last screws.
<Contactor> (Photo 3-2)
(4) Disconnect all the lead wires from the contactors.
(5) Remove the 2 screws on each contactor.
Note: To avoid dropping of the contactors, hold the contactors
by hand when removing the last screws.
To prevent an electrical shock, wait until all the LED
lamps on the FTC4 control board are turned off.
<Terminal block> (Photo 3-2)
(4) Disconnect all the lead wires from the terminal block. (To
disconnect the S1, S2 and S3 lead wires, disengage the
locks by pressing on the claws.)
(5) Remove the screw on the terminal block.
Note: To avoid dropping of the terminal block, hold the termi-
nal block by hand when removing the screw .
<Controller board> (Photo 3-3)
(4) Disconnect all the lead wires from the controller board.
(5) Remove the controller board from the 6 board supports.
Photo 3-2
* The photos shown are of the EHSC model.
Terminal block (TB1)
Earth leakage circuit
breaker (ECB1)
Contactors
Control box
Controller
board
Screw
Photo 3-1
Control box cover
fixing screws
Control box cover fixing screws
Control box
cover
Controller
board
OCH532A
70
DISASSEMBLY PROCEDURE
PHOTOS
Photo 4-1
Photo 4-2
* The photos shown are of the EHSC model.
4. How to swing the control box to the front
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Remove the control box cover. (Refer to Procedure 3.)
* If the screw of the control box bracket (R) and 2 screws
of the control box bracket (L) are removed, the control
box can be swung to the front without removing control
box cover.
(3) Remove the screw from the control box bracket (R) and
2 screws from the control box bracket (L).
(4) Remove the coated clamps.
(5) Disengage the control box bracket (R) from the right-
hand side panel and pull the control box. At this point,
lifting slightly and pulling the control box will swing the
control box to the front. (Photo 4-2)
Note: Remove the field wiring as necessary.
Control box
Coated clamps
Earth cable
Bracket
(R)
Side panel
Swing
Screw
Screw
Screw
Bracket
(L)
OCH532A
71
DISASSEMBLY PROCEDURE
PHOTOS
Photo 5-1
5. How to remove water pump/ pump valve
<Water pump>
Close the 2 pump valves (OFF) before removing the water
pump, and open the valves (ON) after reinstalling the water
pump.
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Remove the control box cover. (Refer to Procedure 3.)
(3) Disconnect the CNP1 connector, the earth cable, and the
CNPWM connector in the control box. (Photo 5-1)
(4) Release the water pump lead wire from the 2 cable
clamps, the cable strap, the 3 coated clamps and feed
the lead wire out the control box without putting strain on
the CNP1 connector. (Photo 5-1)
(5) Swing the control box to the front. (Refer to Procedure 4.)
(6) Remove the pump support top by removing the 2 screws
holding it to the pump support under (Photo 5-2).
Note: To avoid dropping of the pump support top, hold it
by hand when removing the last screw, .
(7) Close (OFF) the 2 pump valves and remove the G1-1/2"
nuts using two spanners: one to hold the pump and the
other to turn the individual nuts.
Remove the water pump by cutting the band fixing the
pump to the pump support under. (Photos 5-2)
* When either of the pump valve handles is stiff, remove
the handle and turn the vertical stem 90 degrees
clockwise mainly by using a spanner. (Photo 5-4)
*
Set the water pump in the orientation of the arrow printed
on the water pump and in the way that the terminal box
faces to the front. (Photo 5-2)
*
When reinstalling the G1-1/2" nuts, use new G1-1/2"
gaskets. (Photo 5-3)
<Pump valve>
(8) Remove the pump valves by removing the G1" nuts
using two spanners: one to hold the pump and the other
to turn each G1" nut . (Photo 5-2)
* When reinstalling the G1" nuts, use new G1" gaskets.
* When either of the pump valve handles is stiff, remove
the handle and turn the vertical stem 90 degrees
clockwise mainly by using a spanner. (Photo 5-4)
*
When reinstalling the valves, place the handles to the
right hand side of the valves.
Note: Skip Steps (3) and (4) above when replacing the pump
valves only.
When replacing both the water pump and the pump
valves, skip Step (7) above.
Photo 5-2
Photo 5-3
Pump
support
top
Nut (G1")
Pump valve
Water pump
Nut (G1")
Pump valve
Nut
(G1-1/2")
Water pump connector (CNP1)
Earth cable
Cable
clamps
Cable
strap
Coated
clamp
Screw
Nut (G1-1/2")
Gasket G1-1/2"
Coated clamps
Terminal box
Screw
Lead
wire
Gasket (G1")
Gasket (G1")
Photo 5-4
Pump valve
Stem
CNPWM
connector
Band
OCH532A
72
DISASSEMBLY PROCEDURE
PHOTOS
OK
NG
NG
Flow switch
Flow switch
Flow switch
Pipe
Pipe
Pipe
Lead wire
Photo 6-1
Water pipe
Flow switch
Flow switch connector
(CN2F)
Cable
clamps
Cable
strap
Coated
clamp
Coated
clamp
Flow direction
Photo 6-2
Photo 6-3
Photo 6-4
O-ring
Flow switch paddle
6. How to remove the flow switch
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Remove the control box cover. (Refer to Procedure 3.)
(3) Disconnect the CN2F connector on the controller board.
(Photo 6-1)
(4) Release the flow switch lead wire from the 2 cable
clamps, the cable strap, the 2 coated clamps and feed
the lead wire out the control box without putting strain
on the CN2F connector. (Photo 6-1)
(5) Swing the control box to the front. (Refer to Procedure 4.)
(6) Remove the flow switch by removing the nut. (Photo 6-2)
* When reinstalling the nut, use a new O-ring.
(Photo 6-3)
Note: To ensure the correct functioning of the flow switch,
check the following when installing it:
▪ The flow switch paddle is set perpendicularly to the
water flow. (Photos 6-2, 6-4)
▪ The lead wire of the flow switch points to the left-hand
side. (Photo 6-2)
▪
The lead wire runs parallel to the water pipe. (Figure 6-1)
Flow
Flow
Flow
Figure 2
Nut
Lead wire
Figure 6-1
OCH532A
73
DISASSEMBLY PROCEDURE
PHOTOS
Photo 7-1
7. How to remove the booster heater
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Remove the control box cover. (Refer to Procedure 3.)
(3) Disconnect the booster heater lead wires from the
CNBHT connector on the controller board and from the
BHC1 (Lead wire No.1 and No.2) and BHC2 (Lead wire
No.3 and No.4) contactors respectively. (Photo 7-1)
(4) Swing the control box to the front. (Refer to Procedure 4.)
Note: Do not mix up the lead wire numbers when
re-connecting the lead wires to the contactors as
the lead wire numbers are different dependent on
the models.
(5) Close (OFF) the pump valve (upper).
(6) Remove the two G1" nuts. (Photo 7-2)
* When reinstalling the G1" nuts, use new G1" gaskets.
(7) Remove the flare nut (Photo 7-2).
(8) Remove the two screws that hold the heater stay onto
the back panel. Lift the booster heater slightly and
remove the booster heater with the heater stay from the
back panel .
(9) Remove the 2 screws on the back of the heater stay and
remove the heater stay from the booster heater. (Photo
7-3)
(10) Remove the drain cock (primary circuit) from the boost-
er heater. (Photo 7-2)
*
Replace the removed drain cock (primary circuit).
The drain cock can not be reused.
Model Lead wire No. Contactor
EHSC-VM6B No.1 BHC1-U
EHSC-VM6EB No.2 BHC1-V
EHPX-VM6B No.3 BHC2-U
No.4 BHC2-V
EHSC-YM9B No.1 BHC1-U
EHSC-TM9B No.2 BHC1-V
EHSC-YM9EB No.3 BHC1-W
EHPX-YM9B No.4 BHC2-U
No.5 BHC2-V
No.6 BHC2-W
EHSC-VM2B No.1 BHC1-U
EHPX-VM2B No.2 BHC1-V
ERSC-VM2B
Refer to 6. WIRING DIAGRAM
Photo 7-2
Photo 7-3
No.1
No.2 BHC1
No.3
No.4
BHC2
Flow switch
connector
(CN2F)
Cable
clamp
Cable strap
Coated clamp
Earth leakage breakers (ECB1)
Connector
(CNBHT)
Cable
clamp
Booster
heater
Drain cock
Nut (G1")
Screws
Flare nut
Pump valve
(upper)
Control box
Nut (G1")
Heater stay
Heater stay
Screw
Screw
Gasket (G1")
Gasket (G1")
* The photos shown are of the EHSC-VM6B model.
Back panel
OCH532A
74
DISASSEMBLY PROCEDURE
PHOTOS
Nut (G1")
Photo 8-1
8. How to remove the plate heat exchanger
(1) Pump down the refrigerant circuit and close the stop
valve on the indoor unit. (Refer to "12. Supplementary
information".)
(2) Remove the front panel. (Refer to Procedure 1.)
(3) Remove the control box cover. (Refer to Procedure 3.)
(4) Disconnect the CNP1 connector on the controller board
and the earth cable in the control box.
(5) Release the water pump lead wire from the 2 cable
clamps, the cable strap, the 2 coated clamps, and feed
the lead wire out the control box without putting strain on
the CNP1 connector.
(6) Swing the control box to the front. (Refer to Procedure 4.)
(7) Remove the pump support top by removing the 2 screws
that hold it to the pump support under. (Photo 8-2)
Note: To avoid dropping of the pump support top, hold it
by hand when removing the last screw.
(8) Remove the THW1 and TH2 thermistors from the
thermistor holders respectively. (Photo 8-2)
(9) Close the pump valve (lower) and remove the G1-1/2"
nut using two spanners: one to hold the pump valve and
the other to turn the nut.
*
When reinstalling the G1-1/2" nut, use a new G1-1/2"
gasket. (Photo 5-3)
(10) Remove the G1" nut (upper) on the booster heater and
the water pump with the pump valve and the water pipe.
(Photo 8-2)
* When reinstalling the G1" nut, use a new G1" gasket.
Water pump connector (CNP1)
Earth cable
Cable
clamps
Cable
strap
Coated clamp
Control box
Photo 8-2
Nut (G1")
Water pump
Pump valve
(lower)
Nut
(G1-1/2")
Screw
Nut (G1-1/2")
Nut
(G1")
Booster
heater
Nut
(G1")(upper)
Gasket (G1")
Rubber
mount
Flow
switch
Band
Strainer
Pressure
relief valve
THW1
TH2
Flexible
hose
Pump valve
(upper)
Pump support under
Pump support top
Gasket
(G1")
Gasket
(G1-1/2")
Gasket
(G1")
Pump valve
(lower)
Nut (G1-1/2")
Pump support under
Screws
Water pump
Screws
Gasket
(G1-1/2")
ERSC-VM2B only
Band
Rubber
mount
Nut (G1")
Gasket
(G1")
TH2
Screw
Photo 8-3
Pump bracket
Pump bracket
OCH532A
75
DISASSEMBLY PROCEDURE
PHOTOS
8. How to remove the plate heat exchanger (continued)
(11) Remove the pump support under by removing the 4
screws. (Photo 8-4,5)
Note: To avoid dropping of the pump support under, hold
it by hand when removing the last screw.
(12) Remove the G1" nut on the flexible hose end that
connects to the booster heater. (Photo 8-2)
* When reinstalling the G1" nut, use a new G1" gasket.
(13) Close the strainer valve and remove the G1" nut on the
water outlet side of the strainer using two spanners: one
to hold the strainer and the other to turn the G1" nut.
(Photo 8-2)
* When reinstalling the G1" nut, use a new G1" gasket.
(14) Remove the rubber mount by cutting the band.
(Photo 8-2)
(15) Remove the flow switch. (Refer to Procedure 6.)
* Do not remove the CN2F connector on the controller
board.
*
When reinstalling the flow switch, use a new O-ring.
(16) Remove the flare nuts on the gas and liquid pipes under
the hydrobox using two spanners: one to hold each
flare joint and the other to turn each flare nut.
(17) Remove the water coil cover by removing the 2 screws.
(Photo 8-6)
(18) Remove the plate heat exchanger assembly from the
hydrobox. Cut the band and remove the flexible hose
by removing the G1" nut at the top of the plate heat
exchanger. Remove the G1" nut at the bottom of the
plate heat exchanger. (Photos 8-7, 8-8, 8-9)
*
When reinstalling the G1" nuts, use new G1" gaskets.
Photo 8-4
Pump
support
under
Screw
Screw
Screw
Photo 8-6
Water coil cover
Screws
Photo 8-5
Nut (G1")
Flexible hose
Band
Refrigerant piping
Plate heat
exchanger
Photo 8-7
Nut (G1")
Nut (G1")
Refrigerant piping
Gasket (G1")
Photo 8-8
Pump support under
Screw
Screw
ERSC-VM2B only
Photo 8-9
Plate heat exchanger assembly
OCH532A
DISASSEMBLY PROCEDURE
PHOTOS
76
9. How to remove the strainer
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Cut the band.
(3) Close the strainer valve (OFF).
* When either of the pump valve handles is stiff, remove
the handle and turn the vertical stem 90 degrees
clockwise mainly by using a spanner. (Photo 5-4)
(4)
Remove the two G1" nuts using two spanners: one to hold
the strainer and the other to turn the individual G1" nuts.
* When reinstalling the G1" nuts, use new G1" gaskets
<Removal of the strainer cover (debris recovery)>
(4) Remove the cover with two spanners: one to hold the
strainer and the other to turn the cover.
*
Be sure to reattach the mesh after washing. (Photo
9-2)
*
When reinstalling the cover , use a new O-ring.
10. How to remove the manometer / pressure relief valve / air
vent (automatic)
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Swing the control box to the front. (Refer to Procedure 4.)
<Manometer>
(3) Hold the sides of the manometer cover, disengage the
claws, and remove the manometer. (Photo 10-1)
(4) Remove the G1/4" nut and feed the capillary tube
through the bottom out the hydrobox.
*
When reinstalling the G1/4" nut, use a new G1/4"
gasket. (Photo 10-2)
(5) Remove the manometer from the manometer cover while
pressing on the claws. (Photo 10-3)
*
When reinstalling the manometer assembly on the hydrobox
beware not to put strain on the root of the capillary tube as
the capillary tube is easy to break at the root.
<Pressure relief valve>
(3) Remove the field piping from the pressure relief valve.
(4) Remove the manometer by removing the G1/4" nut.
*
When reinstalling the G1/4" nut, use a new G1/4"
gasket. (Photo 10-2)
(5) Cut the band and remove the rubber mount. (
Photo 10-2
)
(6) Remove the pressure relief valve with a flare joint using
two spanners: one to hold the flare joint and the other to
turn the flare nut. (Photo 10-2)
(7) Remove the pressure relief valve using two spanners:
one to hold the flare joint and the other to turn the
pressure relief valve. (Photo 10-4)
(8) Eliminate locktite on the thread surfaces using remover.
(Photo 10-4)
*
Before reinstallation, apply locktite over the thread
surface on the pressure relief valve.
*
For more details about the locktite and the remover,
refer to Page 81.
Photo 10-3
Photo 9-1
Photo 10-1
Manometer
Nut (G1")
Strainer
Strainer valves
Manometer
cover
Claws
Photo 10-2
Nut (G1/4")
Capillary
tube
Capillary
tube
Claw
Rubber mount
Band
Pressure
relief valve
Band
Nut (G1")
Flare nut
Cover
Root
Gasket (G1/4")
Claw
Manometer
Gasket
(G1")
Gasket
(G1")
Strainer mesh
Cover
O-ring
Photo 9-2
OCH532A
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DISASSEMBLY PROCEDURE
PHOTOS
10. How to remove the manometer / pressure relief valve / air
vent (automatic) (Continued)
<Air vent (automatic)>
(1) Remove the air vent with a flare joint using two spanners:
one to hold the flare joint and the other to turn the flare
nut.
(2) Remove the flare joint from the air vent. (Photo 10-6)
11. How to remove the expansion vessel
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Swing the control box to the front. (Refer to Procedure 4.)
(3) Remove the flare nut using two spanners: one to hold the
flare joint and the other to turn the flare nut. (Photo 11-1)
(4) Remove the 2 screws on the metal support.
Note: To avoid dropping of the expansion vessel, hold the
expansion vessel with the metal support by hand
when removing the last screw.
(5) Pull out the metal support. (Photo 11-1)
(6) Pull out the expansion vessel. (Photo 11-1)
(7) Remove the flare joint from the expansion vessel.
(Photo 11-2)
*
When reinstalling the flare joint, use a new G3/8"
gasket.
Note: To avoid dropping of the expansion vessel, hold it
securely when removing it.
Photo 11-2
Expansion vessel
Flare nut
Air vent
Photo 10-5
Air vent
Flare joint
Expansion vessel
Flare joint
Photo 10-6
Photo 11-1
Screws
Expansion vessel
Flare joint
Metal support
Flare nut
Gasket G3/8"
Photo 10-4
Flare joint
Pressure relief valve
Threads for application
of loctite
OCH532A
78
DISASSEMBLY PROCEDURE
PHOTOS
12. How to remove the drain cock (primary circuit)
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Swing the control box to the front. (Refer to Procedure 4.)
(3) Remove the drain cock (primary circuit).
13. How to remove the flexible hose
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Swing the control box to the front. (Refer to Procedure 4.)
(3) Cut the band. (Photo 13-1, 13-2)
(4) Cut the pipe cover tape about 10 cm from the top and
peel off the pipe cover.
(Photo 13-1)
*
Reattach the pipe cover after reconnecting the flexible
hose.
(5) Loosen the flexible hose nuts on both ends and remove
the flexible hose. (Photos 13-1, 13-2)
* When reinstalling the nuts, use new G1" gaskets.
Photo 12-1
Drain cock
Booster heater
Photo 13-1
Nut (G1")
Refrigerant piping
Nut (G1")
Flexible hose
Plate heat exchanger
Band
Photo 13-2
Nut
(G1")
Flexible hose
Tape
Gasket
(G1")
Nut
(G1")
Gasket (G1")
Flexible hose
Gasket (G1")
Band
OCH532A
79
DISASSEMBLY PROCEDURE
PHOTOS
Photo 14-1
Photo 14-2
14. How to remove the thermistor <liquid refrigerant temp.>
(TH2) / thermistor <flow water temp. & return water temp.>
(THW1, THW2)
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Remove the control box cover. (Refer to Procedure 3.)
(3) Disconnect the following connectors on the control board.
▪ TH2 (TH2)
▪ THW1, THW2 (THW12)
(4) Release the THW12 and TH2 lead wires from the cable
clamp, the cable strap and the 2 coated clamps. Feed
the lead wires out the control box without putting strain
on their connectors.
(5) Swing the control box to the front. (Refer to Procedure 4.)
(6) Remove the thermistors from the thermistor holders.
(Photo 14-2)
Cable
clamp
Cable
strap
Coated
clamp
Earth leakage breakers (ECB1)
Connectors
(THW1)
(THW2)
(TH2)
Control box
TH2 thermistor
THW1 thermistor
THW2 thermistor
Coated clamps
Band
OCH532A
80
DISASSEMBLY PROCEDURE
PHOTOS
Photo 15-1
15. How to remove the drain pan (ERSC-VM2B only)
(1) Remove the front panel.
(2) Disconnect all the field piping.
(3) Cut the band holding the strainer. (Photo 15-2)
(4) Remove 3 screws on the cover plate. (Photo 15-3)
(5) Remove the cover plate. (Photo 15-4)
(6) Remove 3 screws each on the side panel (L, R), and 2
screws on the underneath surface and base assy from
the hydrobox. (Photo 15-5)
(7) Remove 5 screws on the base assy. (Photo 15-6)
(8) Remove the drain pan from the base. (Photo 15-7)
Photo 15-2
Photo 15-3
Photo 15-5
Drain pan
Screws
Screws
Screws
Photo 15-4
Base
Cover plate
Photo 15-6
Photo 15-7
Base assy
Base
Drain pan
Screws
Band
Strainer
Cover plate
OCH532A
81
Notes on replacing the parts
Replacement of the parts listed below requires the following procedure.
After the parts are removed, eliminate loctite on threads by applying loctite remover, apply new loctite, and then install and tighten the parts to the specifi ed
tightening torques below. For details about recommended loctite and loctite remover, refer to Table 11-1, and for details about the replacement parts and
their tightening torques, refer to Table 11-2.
Table 11-1
Recommended Manufacturer No. Note
Loctite Henkel Loctite 577 Apply loctite all over from the end of external thread to the second
ridge. After installing the parts, fi x the parts for at least 30 minutes
Loctite remover Henkel Loctite 7200 Gasket Remover Spray loctite remover over sealant on the threads, let the sealant
sit until soft, and then eliminate it with a wire brush.
Note: When using the products above, refer to the appropriate manuals that come with the individual products.
Table 11-2
Part name *1
Recommended tightening
torque [Nm] *2
PRESSURE RELIEF VALVE 3bar 15 ± 1
*1. For more details about the listed parts refer to the parts catalogue included in this manual.
*2. Undertightening and overtightening the parts affect water seal life. Tighten the parts to the appropriate tightening torques.
When installing the parts that are not listed above, observe the tightening torques in accordance with Table
11-3
.
Always use a new O
-
ring or gasket.
Table 11-3
Size
[inch]
Recommended tightening torque
[Nm]
Gasket
G1/4" 8 ± 1
G3/8" 15 ± 1
G1" 42 ± 2
G1 1/2" 42 ± 2
O-ring
Strainer cover 45 ± 4.5
Flow switch 8 ± 1
Air vent (Automatic) 15 ± 1
Attached packing
Drain cock (primary circuit) 15 ± 1
Flare joint (for water circuit parts)
35 ± 2
After the procedure is complete, ensure that no water leaks.
OCH532A
82
12
SUPPLEMENTARY INFORMATION
12-1. Refrigerant collecting (pumpdown) for split model systems only
Refer to “Refrigerant collection” in the outdoor unit installation manual or service manual.
12-2. Back-up operation of boiler
Heating operation is backed up by boiler.
For more details, refer to the installation manual of PAC-TH011HT-E.
<Installation & System set up>
1. Set Dip-SW 1-1 to ON "With boiler" and SW2-6 to ON “With Mixing tank”.
2. Install the thermistors THWB1 (Flow temp.) and THWB2 (return temp.) *1 on the boiler circuit.
3. Connect the output wire (OUT10: Boiler operation) to the input (room thermostat input) on the boiler. *2
4. Install one of the following room temp. thermostats. *3
Wireless remote controller (option)
Room temp. thermostat (fi eld supply)
Main controller (remote position)
*1 The boiler temp. thermistor is an optional part.
*2 OUT10 has no voltage across it.
*3 Boiler heating is controlled on/off by the room temp. thermostat.
<Remote controller settings>
1. Go to Service menu > Heat source setting and choose “Boiler” or “Auto”. *4
2. Go to Service menu > Operation settings > Boiler settings to make detailed settings for “Auto” above .
*4 The “Auto” automatically switches heat sources between Heat pump (and Electric heater) and boiler.
OCH532A
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13
SERVICE AND MAINTENANCE
The main controller settings changed from the default settings are reset by replacing the controller board. To facilitate reselecting settings on the main controller, it is
recommended to write down the changes in the sheet below before replacement.
13-1. Engineers Forms (1/2)
Should settings be changed from default, please enter and record new setting in ‘Field Setting’ column. This will ease resetting in the future should the system use
change or the circuit board need to be replaced.
Commissioning/Field settings record sheet
Main controller screen Parameters
Default setting
Field
setting
Notes
Main Zone1 heating room temp 10°C - 30°C 20°C
Zone2 heating room temp *1 10°C - 30°C 20°C
Zone1 heating fl ow temp 25°C - 60°C 45°C
Zone2 heating fl ow temp *1 25°C - 60°C 35°C
Cooling fl ow temp *2 5°C - 25°C 15°C
Zone1 heating compensation curve −9°C - + 9°C 0°C
Zone2 heating compensation curve *1 −9°C - + 9°C 0°C
Holiday mode Active/Non active/Set time –
Option Forced DHW operation On/Off –
DHW On/Off/Timer On
Heating On/Off/Timer On
Holiday mode Active/Non active/Set time –
Setting DHW *3 Operation mode Normal/Eco Normal
DHW max. temp. 40°C - 60°C 50°C
DHW temp. drop 5°C - 30°C 10°C
DHW max. operation time 30 - 120 mins 60 mins
DHW mode restriction 30 - 120 mins 30 mins
Legionella prevention *3 Active Yes/No Yes
Hot water temp 60°C - 70°C 65°C
Frequency 1 - 30 days 15 days
Start time 00.00 - 23.00 03.00
Max. operation time 1 - 5 hours 3 hours
Duration of maximum temp. 1 - 120 mins 30 min
Heating/Cooling *2 Zone1 operation mode Heating room temp/Heating fl ow temp/Heating
compensation curve/Cooling fl ow temp
Room temp
Zone2 operation mode *1 Heating room temp/Heating fl ow temp/Heating
compensation curve
Compensation
curve
Compensation
curve
Hi set point Zone1 outdoor ambient temp −15°C - +35°C –15°C
Zone1 fl ow temp 25°C – 60°C 50°C
Zone2 outdoor ambient temp *1 −15°C - +35°C –15°C
Zone2 fl ow temp *1 25°C - 60°C 40°C
Lo set point Zone1 outdoor ambient temp −15°C - +35°C 35°C
Zone1 fl ow temp 25°C - 60°C 25°C
Zone2 outdoor ambient temp *1 −15°C - +35°C 35°C
Zone2 fl ow temp *1 25°C - 60°C 25°C
Adjust Zone1 outdoor ambient temp −14°C - +34°C —
Zone1 fl ow temp 25°C - 60°C —
Zone2 outdoor ambient temp *1 −14°C - +34°C —
Zone2 fl ow temp *1 25°C - 60°C —
Holiday DHW *3 Active/Non active Non active
Heating/Cooling *2 Active/Non active Active
Zone1 heating room temp 10°C - 30°C 15°C
Zone2 heating room temp *1 10°C - 30°C 15°C
Zone1 heating fl ow temp 25°C - 60°C 35°C
Zone2 heating fl ow temp *1 25°C - 60°C 25°C
Cooling fl ow temp *2 5°C - 25°C 25°C
Initial settings Language
ENG/FR/GER/SW/SP/IT/DA/NL/FIN/NOR/PT ENG
°C/°F
°C/°F °C
Temp. display
Room/DHW tank/Room&DHW tank /Off Off
Time display
hh:mm/hh:mm AM/AM hh:mm hh:mm
Room sensor settings for Zone1
TH1/Main RC/Room RC1-8/“Time/Zone” TH1
Room sensor settings for Zone2 *1
TH1/Main RC/Room RC1-8/“Time/Zone” TH1
Room RC zone select *1
Zone1/Zone2 Zone1
*1 The settings related to Zone2 can be switched only when Zone2 temperature control is enabled (when Dip SW2-6 and SW 2-7 are ON).
*2 Cooling mode settings are available for ERSC-VM2B only.
*3 Only available if DHW tank present in system.
OCH532A
84
Engineers Forms (2/2)
Commissioning/Field settings record sheet (continued from the previous page)
Main controller screen Parameters
Default
setting
Field
setting
Notes
Setting Service menu Thermistor
adjustment
THW1
−10°C - +10°C
0°C
THW2
−10°C - +10°C
0°C
THW5
−10°C - +10°C
0°C
THW6
−10°C - +10°C
0°C
THW7
−10°C - +10°C
0°C
THW8
−10°C - +10°C
0°C
THW9
−10°C - +10°C
0°C
THWB1
−10°C - +10°C
0°C
THWB2
−10°C - +10°C
0°C
Auxiliary
settings
Economy settings
for pump
On/Off On
Time before pump switched off (3 - 60 mins) *4
10 mins
Electric heater
(Heating)
Space heating: On (used)/Off (not used) On
Electric heater delay timer (5 - 180 mins) 30 mins
Electric heater
(DHW) *3
DHW: On (used)/Off (not used) On
Electric heater delay timer (15 - 30 mins) 15 mins
Mixing valve
control
Running time (10 - 240 secs) 120 secs
Interval (1 - 30 mins) 2 mins
Pump speed Pump speed (1 - 5) 5
Heat source setting Standard/Heater/Boiler/Hybrid *5 Standard
Operation
settings
Freeze stat function Outdoor ambient temp. (3 - 20°C) 5°C
Simultaneous
operation (DHW/
Heating)
On/Off *6 Off
Outdoor ambient temp. (−15 - +10°C) −15°C
Cold weather function
On/Off *6 Off
Outdoor ambient temp. (−15 - −10°C) −15°C
Room temp control
(Heating)
Temp. control interval (10 - 60 mins) 10 mins
Flow temp. range
Min. temp. (25 - 45°C)
30°C
Max. temp. (35 - 60°C)
50°C
Heat pump thermo diff.
adjust
On/Off *6 On
Lower limit (−9 - −1°C)
−5°C
Upper limit (+3 - +5°C)
5°C
Boiler operation
Hybrid settings Outdoor ambient temp. (−15 - +10°C) −15°C
Priority mode (Ambient/Cost/CO
2
)
Ambient
Intelligent settings Energy price *7Electricity (0.001 - 999 */kWh)
0.5
*/kWh
Boiler (0.001 - 999 */kWh)
0.5
*/kWh
CO2
emission
Electricity
(0.001 - 999 kg -CO2/kWh)
0.5 kg -CO2/kWh
Boiler (0.001
- 999 kg
-CO2/kWh)
0.5 kg -CO2/kWh
Heat source Heat pump capacity
(1
- 40 kW)
11.2
kW
Boiler effi ciency
(25
- 150%)
80%
Booster heater 1 capacity
(1
- 20 kW)
2 kW
Booster heater 2 capacity
(1
- 20 kW)
4 kW
Floor dry up function
On/Off *6 Off
Target temp. Start&Finish
(25 - 60°C) 30°C
Max. temp.
(25 - 60°C) 45°C
Max. temp. period
(1 - 20 days)
5 days
Flow temp. (Increase)
Temp. increase step (+1 - +10°C) +5°C
Increase interval (1 - 7 days)
2 days
Flow temp. (Decrease)
Temp. decrease step (−1 - −10°C)
−
5°C
Decrease interval (1 - 7 days)
2 days
External input
settings
Demand control
(IN4)
Heat source OFF/Boiler operation Boiler
operation
Outdoor thermostat
(IN5)
Heater operation/Boiler operation Boiler
operation
*4 Decreasing “time before pump switched off” may increase the duration of stand-by in Heating mode.
*5 When Dip SW1-1 is set to OFF “WITHOUT Boiler” or SW2-6 is set to OFF “WITHOUT Mixing tank”, neither Boiler nor Hybrid can be selected.
*6 On: the function is active; Off: the function is inactive.
*7 “*” of “*/kwh” represents currency unit (e.g. € or £ or the like)
OCH532A
85
13-2. Annual Maintenance Log Book
Contractor name Engineer name
Site name Site number
Hydrobox maintenance record sheet
Warranty number Model number
Serial number
No. Mechanical Frequency Notes
1
Isolate and drain hydrobox, remove mesh from internal strainer clean and
replace.
2
Open the pressure relief valve, check for unrestricted discharge to
the tundish and that the valve reseats correctly. Check there are no
blockages in the tundish and associated pipe work.
3
Drop the primary/heating system pressure to zero check and if necessary
top up the expansion relief vessel (1 bar). Air valve of expansion vessel
is TR-412.
4
Check and if necessary top up the concentration of anti-freeze/inhibitor (if
used in the system).
5
Top up the primary/heating system using an appropriate fi lling loop and
re-pressurise to 1 bar.
6
Heat system and check pressure does not rise above 3 bar and no water
is released from the safety valves.
7 Release any air from the system.
Refrigerant models only [EXCEPT EHPX] Frequency Notes
1 Refer to outdoor unit manual.
Electrical Frequency Notes
1 Check condition of cables.
2 Check rating and fuse fi tted on the electricity supply.
Controller Frequency Notes
1 Check fi eld settings against factory recommendations.
2 Check battery power of wireless thermostat and replace if necessary.
Outdoor heat pump unit maintenance record sheet
Model number Serial number
Mechanical Frequency Notes
1 Inspect grill, heat exchanger fi ns and air inlet for trapped debris/damage.
2 Check condensate drain provision.
3 Check integrity of water pipe work and insulation.
4 Check all electrical connections.
5 Check and record the operation voltage.
* All the above checks should be carried out once a year.
Note:
Within the fi rst couple of months of installation, remove and clean the hydrobox’s strainer plus any that are fi tted external to the hydrobox. This is espe-
cially important when installing on an existing system.
In addition to annual servicing it is necessary to replace or inspect some parts after a certain period of system operation. Please see tables below for detailed instructions. Replacement and inspection of parts should always be done by a competent person with relevant training and qualifi cations.
Parts which require regular replacement
Parts Replace every Possible failures
Pressure relief valve (PRV)
Air vent (Auto/Manual)
Drain cock (Primary circuit)
Flexible hose
Manometer
6 years
Water leakage due to
brass/copper corrosion
(Dezincifi cation)
Parts which require regular inspection
Parts Check every Possible failures
Immersion heater 2 years
Earth leakage causing
circuit breaker to activate
(Heater is always OFF)
Water circulation pump 20,000 hrs (3 years)
Water circulation pump
failure
Parts which must NOT be reused when servicing
* O-ring
* Gasket
Note:
Always replace the gasket for pump with a new one at each regular maintenance (every 20,000 hours of use or every 3 years).
OCH532A
HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
Copyright 2012 MITSUBISHI ELECTRIC CORPORATION
Distributed in Jan. 2013 No. OCH532 REVISED EDITION-A
Distributed in Sep. 2012 No. OCH532
Made in Japan
New publication, effective Jan. 2013
Specifications are subject to change without notice.
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