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
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