Mitsubishi Electric EHSC-VM6A, EHPX-VM2A, EHSC-YM9A Service Manual

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Page 1

SERVICE MANUAL

HYDROBOX

No. OCH503

CONTENTS

1. REFERENCE MANUAL

...................................

2. SAFETY PRECAUTION

...................................

3. SPECIFICATIONS

............................................

4. PART NAMES AND FUNCTIONS

..................

5. OUTLINES AND DIMENSIONS

.....................

6. WIRING DIAGRAM

........................................

7. FIELD WIRING

...............................................

8. WATER SYSTEM DIAGRAM

.........................

9. CONTROLS

...................................................

10. TROUBLESHOOTING

...................................

11. DISASSEMBLY PROCEDURE

......................

12. SUPPLEMENTARY INFORMATION

.............

13. SERVICE AND MAINTENANCE

...................

July 2011

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 (OCB503)

[Model name]

EHSC-VM6A

EHSC-YM9A

EHPX-VM2A

[Service Ref.]

EHSC-VM6A.UK EHSC-YM9A.UK EHPX-VM2A.UK

HYDROBOX

TENTATIVE

Page 2

REFERENCE MANUAL

OUTDOOR UNIT'S SERVICE MANUAL

Service Ref. Service Manual No.

PUHZ-RP35/50/60/71VHA4

OCH451PUHZ-RP100/125/140VKA

PUHZ-RP100/125/140YKA

PUHZ-HRP71/100VHA

OCH425

PUHZ-HRP71/100VHA2

PUHZ-HRP71/100VHA2R1

PUHZ-HRP100VHA2R2

PUHZ-HRP100/125YHA

PUHZ-HRP100/125YHA2

PUHZ-HRP100/125YHA2R1

PUHZ-W50/85VHA

OCH439

PUHZ-W50/85VHA-BS

PUHZ-W85VHAR1

PUHZ-W85VHAR1-BS

PUHZ-W85VHA2.UK

OCH465

PUHZ-W85VHA2-BS.UK

PUHZ-HW112/140YHA

OCH439

PUHZ-HW112/140YHA-BS

PUHZ-HW112/140YHA2

PUHZ-HW112/140YHA2-BS

PUHZ-HW140VHA

PUHZ-HW140VHA-BS

PUHZ-HW140VHA2

PUHZ-HW140VHA2(R1)-BS

Page 3

SAFETY PRECAUTION

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.

This installation manual along with the user manual should be left with the product after installation for future reference. Mitsubishi Electric is not responsible for the failure of locally or 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 authorised 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 and employ 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 items containing liquid 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.

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 manufacturer.

Page 4

CAUTION (SPLIT MODELS ONLY)

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.) 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.)

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. If a charging cylinder is used, 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.

Page 5

Cautions for units utilizing refrigerant R410A

CAUTIONS RELATED TO NEW REFRIGERANT

Use new refrigerant pipes.

If using the existing R22, be careful of the followings.

· For RP100, 125 and 140, be sure to perform replacement operation before test run.

· Change flare nut to the one provided with this product. Use a newly flared pipe.

· Avoid using thin pipes.

Charge refrigerant from liquid phase of gas cylinder.

If the refrigerant is charged from gas phase, composition change may occur in refrigerant and the efficiency will be lowered.

Only use R410A refrigerant.

If other refrigerant (R22 etc.) is used, chlorine in refrigerant can cause deterioration of refrigerant oil etc.

Use a vacuum pump with a reverse flow check valve.

Vacuum pump oil may flow back into refrigerant cycle and that can cause deterioration of refrigerant oil etc.

Use the following tools specifically designed for use with R410A refrigerant.

The following tools are necessary to use R410A refrigerant.

Handle tools with care.

If dirt, dust or moisture enters into refrigerant cycle, that can cause deterioration of refrigerant oil or malfunction of compressor.

Do not use a charging cylinder.

If a charging cylinder is used, the composition of refrigerant will change and the efficiency will be lowered.

Flare tool

Electronic refrigerant charging scale

Vacuum pump adaptor

Size adjustment gauge

Gauge manifold

Torque wrench

Gas leak detector

Charge hose

Tools for R410A

Contamination inside refrigerant piping can cause deterioration of refrigerant oil etc.

If dirt, dust or moisture enters into refrigerant cycle, it can cause deterioration of refrigerant oil or malfunction of compressor.

If large amounts of mineral oil enters, it can cause deterioration of refrigerant oil etc.

The refrigerant oil applied to flare and flange connections must be ester oil, ether oil or alkylbenzene oil in a small amount.

Store the piping to be used indoors during installation, and both ends of the piping sealed until just before brazing. (Leave elbow joints, etc. in their packaging.)

Ventilate the room if refrigerant leaks during operation. If refrigerant comes into contact with a flame, poisonous gases will be released.

Make sure that the inside and outside of refrigerant piping is clean and it has no contaminants such as sulfur, oxides, dirt, shaving particles, etc, which are hazard to refrigerant cycle. In addition, use pipes with specified thickness.

Use the specified refrigerant only.

Never use any refrigerant other than that specified.

Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of. Correct refrigerant is specified in the manuals and on the spec labels provided with our products. We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to follow the instructions.

Page 6

Gravimeter

Unit

[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 cylinder

· Check that 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

Gauge manifold

· Only for R410A

· Use the existing fitting

specifications

. (UNF1/2)

· Use high-tension side pressure of 5.3 MPa·G or over.

Charge hose

· Only for R410A

· Use pressure performance of 5.09 MPa·G or over.

Electronic scale

—

Gas leak detector · Use the detector for R134a, R407C or R410A

Adaptor for reverse flow check · Attach on vacuum pump.

Refrigerant charge base

—

Refrigerant cylinder

· Only for R410A ·Top of cylinder (Pink)

· Cylinder with syphon

Refrigerant recovery equipment

—

Page 7

SPECIFICATIONS

Model name EHSC-VM6A EHSC-YM9A EHPX-VM2A

Overall unit dimensions 800 × 530 × 360 mm (Height × Width × Depth)

Weight (empty) 54 kg 54 kg 39 kg

Weight (full) 60 kg 60 kg 44 kg

Plate heat exchanger

Unvented expansion vessel (Primary circuit)

Nominal volume 10 L

Charge pressure 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 Control thermistor 80°C

Manual reset thermostat 90°C

Thermal Cut Off (for dry run prevention) 121°C

Primary circuit circulating Pump Grundfos UPSO 25-70 180

Connections Water 28 mm compression primary circuit

Refrigerant (R410A)

Liquid 9.52 mm 9.52 mm —

Gas 15.88 mm 15.88 mm —

Operating ambient condition 0 (*1) - 35°C ( 80 %RH)

Electrical data Control board Power supply

(Phase, voltage, frequency)

~/N, 230 V, 50 Hz

Breaker (*when powered from independent source)

10A

Booster heater Power supply

(Phase, voltage, frequency)

~/N, 230 V, 50 Hz 3~, 400 V, 50 Hz ~/N, 230 V, 50 Hz

Capacity 2 kW+4 kW 3 kW+6 kW 2 kW

Current 26 A 13 A 9 A

Breaker 32 A 16 A 16 A

*1 The environment must be frost-free.

Optional extras

• Wireless Remote Controller PAR-WT40R-E • Joint pipe (15.88  12.7) PAC-SH50RJ-E

• Wireless Receiver PAR-WR41R-E • Joint pipe (9.52  6.35) PAC-SH30RJ-E

• Remote sensor PAC-SE41TS-E

Page 8

PART NAMES AND FUNCTIONS

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

Inlet from space heating/Indirect DHW cylinder (primary return)

Outlet to space heating/Indirect DHW cylinder (primary ﬂ ow)

C Refrigerant (Liquid)

D Refrigerant (Gas)

Discharge from pressure relief valve (installer to pipe connect to suitable drain point)

<EHSC> (Split model system)

Figure 4-1

Figure 4-2

Page 9

Figure 4-3

Figure 4-4

Number Component

1 Control and electrical box

2 Main controller

3 Manometer

4 Expansion vessel

5 Expansion vessel charge valve

Automatic air vent

7 Booster heater

8 Drain cock

9 Water circulation pump

10 Pressure relief valve

11 Flow switch

13 Strainer valve

Inlet from space heating/Indirect DHW cylinder (primary return)

B Inlet from heat pump

C Outlet to heat pump

Outlet to space heating/Indirect DHW cylinder (primary ﬂ ow)

Discharge from pressure relief valve (installer to pipe connect to suitable drain point)

<EHPX> (Packaged model system)

Page 10

357

348

381

237

326

142

189

86 124

163

461

233

253

282

55.5

(233)

590

520

264.5

800

110±5

100±5

142

189

233

253

282

124

157 163 237

461

348

357

520

800

264.5

577

110±5

55.5

(233)

OUTLINES AND DIMENSIONS

5-1. Technical Drawings

(Unit: mm)

Letter Pipe description Connection size/type

Space heating/Indirect DHW cylinder (primary) return connection

28 mm/Compression

Space heating/Indirect DHW cylinder (primary) ﬂ ow connection

28 mm/Compression

C Refrigerant (Liquid) 9.52 mm/Flare

D Refrigerant (Gas) 15.88 mm/Flare

Discharge pipe (by installer) from pressure relief valve

G1/2” female (valve port within hydrobox casing)

F Electrical cable inlets

— *The leftmost inlet is for

wireless receiver (option)

Letter Pipe description Connection size/type

Space heating/Indirect DHW cylinder (primary) return connection

28 mm/Compression

B Flow connection from heat pump 28 mm/Compression

C Return connection to heat pump 28 mm/Compression

Space heating/Indirect DHW cylinder (primary) ﬂ ow connection

28 mm/Compression

Discharge pipe (by installer) from pressure relief valve

G1/2” female (valve port within hydrobox casing)

F Electrical cable inlets

— *The leftmost inlet is for wire-

less receiver (option)

<EHSC> (Split model system)

<EHPX> (Packaged model system)

<Front>

<Front>

Page 11

Service access

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.

Page 12

* See Chapter 6-4.

6 WIRING DIAGRAM

6-1. EHSC-VM6A

Page 13

* See Chapter 6-4.

6-2. EHSC-YM9A

Page 14

* See Chapter 6-4.

6-3. EHPX-VM2A

Page 15

Automatic switch to backup heater only operation

Back-up heater operation (*1) will automatically run when the indoor 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, P8, U1 to U8, Ud, UE, UF, UL, UP

(*1) Prolonged running of the back-up operation may affect the life of the heater. (*2) For safety reasons, this function is not available for certain faults. (System operation must be stopped and only pump keeps running.)

6-4. Dip switch setting

Located on the FTC3 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 below in the table below.

SW1 SW2

SW3

SW4

Dip switch Function OFF ON

Default

(Indoor unit Ref.)

SW1

SW1-1 — — —

OFF

SW1-2

Heat pump maximum outlet water temperature

55 °C 60 °C

OFF: EHSC ( 1) ON : EHPX

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 OFF

SW1-7

Outdoor unit type Split type Packaged type OFF: EHSC

ON : EHPX

SW1-8

Wireless remote controller

WITHOUT wireless remote controller

WITH wireless remote controller OFF

SW2

SW2-1

Room thermostat input (IN1) logic change Operation stop at thermostat short Operation stop at thermostat open OFF

SW2-2

Flow switch input (IN2) logic change Failure detection at short Failure detection at open ON

SW2-3

Booster heater capacity restriction Inactive Active OFF: EHSC

ON : EHPX-VM2A

SW2-4 — — —

OFF

SW2-5

Automatic switch to backup heater only operation (When outdoor unit stops by error)

Inactive

Active (

OFF

SW2-6 — — —

OFF

SW2-7 — — —

OFF

SW2-8 — — —

OFF

SW3

SW3-1 — — —

OFF

SW3-2 — — —

OFF

SW3-3

— — — OFF

SW3-4~8

— — — OFF

SW4

SW4-1~4

— — — OFF

SW4-5

Emergency mode (Heater only operation) Normal Emergency mode (Heater only operation)

(To be activated only when powered ON)

OFF (

SW4-6 — — —

OFF

Notes:

1. For packaged model system, the max outlet water temperature is always 60°C so default Dip switch SW1-2 is ON. For split model system, the max outlet water temperature is usually 55°C except in the case of PUHZ-HRP outdoor model where the max outlet water temperature is 60°C and DIP switch SW1-2 should be changed to ON.

If emergency mode is no longer required, please turn off both outdoor and indoor unit power supply before returning SW4-5 to OFF position.

3. For safety reasons, this function is not available for certain errors. (System operation must be stopped and only pump keeps running.) External output (OUT11) will be available.

Page 16

Power supply ~/N 230V 50Hz

Earth

leakage

breaker

Wiring circuit

breaker

Isolating

switch

Outdoor unit

TB1

ECB1

Wiring circuit

breaker

Isolating

switch

To control board

ELB for booster heater (Primary circuit)

Power supply ~/N 230V 50Hz

Hydrobox

FIELD WIRING

Option 1: Hydrobox powered via outdoor unit

<1 phase>

Electrical connections 1 phase

Description Power supply Capacity (Indoor unit Ref.) Breaker Wiring

Booster heater (Primary circuit) ~/N 230 V 50 Hz 2 kW (EHPX-VM2A) 16 A *1 2.5 mm²

6 kW (EHSC-VM6A) 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 AC230V

Hydrobox - Outdoor unit S2 - S3 *3 DC24V

*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. The power supply MUST have sufﬁ cient capacity for each heater and ALL electrical loads. Insufﬁ cient power supply may result in chattering of load contactor(s).

* Installer MUST afﬁ x label A that is included with the manuals near each wiring diagram for hydrobox and outdoor units.

Page 17

Power supply 3N~ 400V 50Hz

Earth

leakage

breaker

Wiring circuit

breaker

Isolating

switch

Outdoor unit

TB1

ECB1

Wiring circuit

breaker

Isolating

switch

To control board

ELB for booster heater (Primary circuit)

Power supply 3~ 400V 50Hz

Hydrobox

<3 phase>

Electrical connections 3 phase

Description Power supply Capacity (Indoor unit Ref.) Breaker Wiring

Booster heater (Primary circuit)

3~ 400V 50Hz 9 kW (EHSC-YM9A) 16 A *1 2.5 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 AC230V

Hydrobox - Outdoor unit S2 - S3 *3 DC24V

*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.

3. Install an earth longer than other cables.

4. The power supply MUST have sufﬁ cient capacity for each heater and ALL electrical loads. Insufﬁ cient power supply may result in chattering of load contactor(s).

* Installer MUST afﬁ x label A that is included with the manuals near each wiring diagram for hydrobox and outdoor units.

Page 18

BLACK

YELLOW

BLACK

CNO1

Black

CNO1

Black

Hydrobox control board

Initial settings (Power supplied

by outdoor unit)

Modified settings (Separate power

supply to the hydrobox)

Power supply ~/N 230V 50Hz

Earth

leakage

breaker

Wiring circuit

breaker

Isolating

switch

Outdoor unit

TB1

ECB1

Wiring circuit

breaker

Isolating

switch

To control board

ELB for booster heater (Primary circuit)

Power supply ~/N 230V 50Hz

Earth leakage breaker

Wiring circuit

breaker

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:

• Hydrobox electrical box connector connections changed (see Figure

4.5.6)

• Outdoor unit DIP switch settings changed to SW8-3 ON.

• Turn on the outdoor unit BEFORE the hydrobox.

<1 phase>

Electrical connections 1 phase

Description Power supply Capacity (Indoor unit Ref.) Breaker Wiring

Booster heater (Primary circuit) ~/N 230 V 50 Hz 2 kW (EHPX-VM2A) 16 A *1 2.5 mm²

6 kW (EHSC-VM6A) 32 A *1 6.0 mm²

Hydrobox power supply ~/N 230 V 50 Hz

Hydrobox input capacity Main switch (Breaker)

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 AC230V Hydrobox - Outdoor unit S1 - S2 *3 — Hydrobox - Outdoor unit S2 - S3 *3 DC24V

*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.

3. Install an earth longer than other cables.

4. The power supply MUST have sufﬁ cient capacity for each heater and ALL electrical loads. Insufﬁ cient power supply may result in chattering of load contactor(s).

* Installer MUST afﬁ x label B that is included with the manuals near each wiring diagram for hydrobox and outdoor units.

Page 19

Earth

leakage

breaker

Wiring circuit

breaker

Isolating

switch

Outdoor unit

TB1

ECB1

Wiring circuit

breaker

Isolating

switch

To control board

ELB for booster heater (Primary circuit)

Earth

leakage

breaker

Wiring

circuit

breaker

Isolating

switch

Power supply ~/N 230V 50Hz

Power supply 3N~ 400V 50Hz

Power supply 3~ 400V 50Hz

Hydrobox

<3 phase>

Electrical connections 3 phase

Description Power supply Capacity (Indoor unit Ref.) Breaker Wiring

Booster heater (Primary circuit) 3~ 400V 50Hz 9 kW (EHSC-YM9A) 16 A *1 2.5 mm²

Hydrobox power supply ~/N 230 V 50 Hz

Hydrobox input capacity Main switch (Breaker)

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 AC230V Hydrobox - Outdoor unit S1 - S2 *3 — Hydrobox - Outdoor unit S2 - S3 *3 DC24V

*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 power (i.e. phase AND neutral) 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.

3. Install an earth longer than other cables.

4. The power supply MUST have sufﬁ cient capacity for each heater and ALL electrical loads. Insufﬁ cient power supply may result in chattering of load contactor(s).

* Installer MUST afﬁ x label B that is included with the manuals near each wiring diagram for hydrobox and outdoor units.

Page 20

WATER SYSTEM DIAGRAM

EHSC-VM6A EHSC-YM9A

EHPX-VM2A

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. (see section 4.2 for detailed instructions.)

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.)

Page 21

CONTROLS

F1 F2 F3 F4

9-1. Main Controller

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 sys-

tem 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 cylinder protection functions (e.g. freeze stat. function) will NOT operate. Please beware that without these safety functions in operation the cylinder may be damaged.

Icon Description

1 Legionella

prevention

When this icon is displayed ‘Legionella Prevention

mode’ is active. (if DHW tank in system) 2 Heat pump When this icon is displayed the ‘Heat pump’ is in

use. 3 Electric heater When this icon is displayed the ‘Electric heaters’ 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. 8 Information Pressing the function button below this icon displays

the information screen. 9 Space heating

mode

Heating mode

10 DHW mode Normal or ECO mode displayed (if DHW tank in

system)

11 Holiday mode

When this icon is displayed ‘Holiday mode’ time is

set.

12 Timer

Prohibited

Stand-by

Stop

Operating

BCD

765

12 11 1 3

Page 22

}

Unrestricted access Installer only Shaded items relate to DHW functions. These are only available if the system includes a DHW tank.

F2 (PREVIEW)

F3 (EDIT)

(Password protected)

Initial

Main screen

Information Option

Forced DHW ON/OFF DHW ON/OFF/Timer Heating ON/OFF/Timer Holiday Active/Non active

Set time

Main menu

DHW Normal

Eco

Edit

DHW max. temp DHW max. temperature 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 mode Heating Flow temp

Room temp Compensation curve

Compensation curve preview Compensation curve edit

Curve parameters Adjustment

Schedule timer menu

Heating DHW Schedule timer preview

Day select Time select Time setting

Temp. setting

Holiday setting

DHW active /non active Heating active/non active Holiday menu

Heating room temp. Heating ﬂ ow temp.

Initial settings

Date/Time yyyy/mm/dd/hh:mm Language ENG/GER/FR/NL/SP/IT/PT/DA/SW/NOR/FIN °C/°F °C/°F Temp. display ON/OFF Contact number Time display hh:mm/hh:mm AM/AM hh:mm Room sensor setting

Sensor setting

TH1/Main controller/Room RC1-8/Time/Zone

Select Time/Zone

Service menu

Manual operation Function setting Thermistor adjustment Auxiliary setting

Economy setting for pump

ON Delay

Freeze stat function Flow t.

Ambient

Electric heater (Heating) ON

Delay

Electric heater (DHW) ON

Delay

Heat source setting Standard (Heat pump & electric heaters)

Heater (Electric heaters only) Operation setting Simultaneous operation Running information Cold weather function Thermistor reading

Room temp. control (Heating)

Temp. control interval Summary of setting Flow temperature range Error history Password protection Manual reset Main controller Yes/No

FTC3 Yes/No

Page 23

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 PASS-

WORD 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 two screens and is comprised of the following functions;

Manual operation Function setting Thermistor adjustment Auxiliary setting Heat source setting Operation setting Running information Thermistor reading Summary of setting Error history Password protection Manual reset

In this Installation Manual instructions will be given only for the following functions;

Auxiliary setting Manual operation Heat source setting Password protection Manual reset

Information on the other functions can be found by consulting the technical or service manuals.

10.

11.

12.

Screen 1 of service menu

Screen 2 of service menu

System off prompt screen

Action requires conﬁ rmation Action is conﬁ rmed

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 and changes can be made to the service settings. If text is displayed in white on a black background CONFIRM button must be pressed to save this choice.

Page 24

Auxiliary setting menu screen

Economy settings for pump screen

Auxiliary Setting

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 setting then press CONFIRM.

From the Auxiliary setting 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 temperature which freeze stat function will begin to operate, (3 - 20 °C) or choose .

If asterisk ( ) is chosen freeze stat function is deactivated/disabled (i.e. freeze

risk).

From the Auxiliary Setting menu highlight Electric heater (Space heating). Press CONFIRM. The Electric heater (Space 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)

From the Auxiliary Setting 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)

From the Auxiliary setting menu highlight Economy Settings for pump. Press CONFIRM. The economy settings for pump screen will be displayed. Use button F1 to switch the pump ON/OFF. Use buttons F3 and F4 to adjust the time the pump will run. (3 - 60 mins)

Freeze stat function screen

Electric heater (Heating) screen

Electric heater (DHW) screen

Page 25

During the ﬁ lling of the system the pump and 3-way valve can be manually over- ridden 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 FTC3.

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. To return to service menu press MENU or BACK button.

Example Pressing F3 button will switch manual operation mode ON for the main 3-way valve. When ﬁ lling of the 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 FTC3 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.

Manual operation menu screen

System off prompt screen

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. NB Changes can ONLY be made to Mode 1.

6. Use F3 and F4 to highlight either 1/2/3 (see below).

7. Press CONFIRM.

Mode 1 Setting number meanings 1 - Power failure automatic recovery NOT available 2 - Power failure automatic recovery AVAILABLE

(Aprox 4-minute delay after power is restored.)

3 - NO FUNCTION

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.

Page 26

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. Use the function buttons to enter index code for the component to be viewed. (See the Table 9-2-1 for component index codes.)

4. Press CONFIRM.

Note Refer to outdoor unit service manual for request code 0 to 149. 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. <Thermistor reading> shows all the thermistor temperature except THW3.

Request

code

Request content Range Unit

154 Indoor unit pump - 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 — 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 Indoor unit pump - Accumulated operating time reset — — 512 Indoor unit - Booster heater temp. (THW3) 3 - 217 °C

Heat source setting screen

Cancel last action screen

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

is highlighted. Press CONFIRM. Heat source setting menu screen is displayed. Press F3 button until preferred heat source is displayed. Press CONFIRM. To return to service menu press MENU or BACK button. 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.

Page 27

Operation Setting Menu

To access the Operation setting menu use F1 and F2 buttons to scroll through the service menu until Operation setting is highlighted. Press CONFIRM. Operation setting menu is displayed.

For extremely low outdoor temperature conditions when the heat pump’s capacity is severely restricted the heating or DHW is provided by only 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 setting 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 ambient (outdoor) temperature is -15°C to -10°C (default -15°C)

To return to Operation setting menu press BACK.

This function allows operational setting of ﬂ ow temperature range from the Eco- dan and also the time interval at which the FTC3 collects and processes data for the auto adaptation mode.

From the Operation setting menu use F1 and F2 buttons to scroll through the list until Room temp. control (HEATING) is highlighted. Press CONFIRM. Room temp. control (HEATING) screen is displayed. To alter the time period at which date will be collected use F1 and F2 buttons to highlight ‘Temp. control interval’. Press CONFIRM. Use F3 and F2 buttons to alter the time interval.

Note: Range 10 – 60 minutes at 10 minute intervals (default 10 minutes).

To alter the ﬂ ow temperature limits, use F1 and F2 buttons to highlight ‘Flow temperature range’. Press CONFIRM.

Flow temperature range screen is displayed.

To alter minimum ﬂ ow temp. use F1 and F2 buttons.

Note: Range of minimum ﬂ ow temp. is 25°C to 40°C (default 30°C).

To alter maximum ﬂ ow temp. use F3 and F4 buttons.

Note: Range of maximum ﬂ ow temp. is 35°C to 60°C (default 50°C)

To return to Operation setting menu press BACK twice.

10.

11.

Operation setting menu screen

Simultaneous operation screen

Cold weather function screen

Room temp. control (HEATING) screen

For periods of very low outside temperature this mode can be used. Simultaneous operation allows both DHW and space heating to be provided simultaneously by using the heat pump to provide space heating whilst only the immersion heater (if ﬁ tted) 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 setting 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 ambient (outdoor) temperature is -15°C to 10°C (default -15°C).

To return to Operation setting menu press BACK.

Page 28

Indoor unit switch setting display (Request code: 162 to 165)

0: OFF 1: ON

SW1, SW2, SW3, SW4

Display

1 2345678 0 0000000 00 00 1 0000000 00 01 0 1000000 00 02 1 1000000 00 03 0 0100000 00 04 1 0100000 00 05 0 1100000 00 06 1 1100000 00 07 0 0010000 00 08 1 0010000 00 09 0 1010000 00 0A 1 1010000 00 0B 0 0110000 00 0C 1 0110000 00 0D 0 1110000 00 0E 1 1110000 00 0F 0 0001000 00 10 1 0001000 00 11 0 1001000 00 12 1 1001000 00 13 0 0101000 00 14 1 0101000 00 15 0 1101000 00 16 1 1101000 00 17 0 0011000 00 18 1 0011000 00 19 0 1011000 00 1A 1 1011000 00 1B 0 0111000 00 1C 1 0111000 00 1D 0 1111000 00 1E 1 1111000 00 1F 0 0000100 00 20 1 0000100 00 21 0 1000100 00 22 1 1000100 00 23 0 0100100 00 24 1 0100100 00 25 0 1100100 00 26 1 1100100 00 27 0 0010100 00 28 1 0010100 00 29 0 1010100 00 2A 1 1010100 00 2B 0 0110100 00 2C 1 0110100 00 2D 0 1110100 00 2E 1 1110100 00 2F 0 0001100 00 30 1 0001100 00 31 0 1001100 00 32 1 1001100 00 33 0 0101100 00 34 1 0101100 00 35 0 1101100 00 36 1 1101100 00 37 0 0011100 00 38 1 0011100 00 39 0 1011100 00 3A 1 1011100 00 3B 0 0111100 00 3C 1 0111100 00 3D 0 1111100 00 3E 1 1111100 00 3F

0: OFF 1: ON

SW1, SW2, SW3, SW4

Display

1 2345678 0 0000010 00 40 1 0000010 00 41 0 1000010 00 42 1 1000010 00 43 0 0100010 00 44 1 0100010 00 45 0 1100010 00 46 1 1100010 00 47 0 0010010 00 48 1 0010010 00 49 0 1010010 00 4A 1 1010010 00 4B 0 0110010 00 4C 1 0110010 00 4D 0 1110010 00 4E 1 1110010 00 4F 0 0001010 00 50 1 0001010 00 51 0 1001010 00 52 1 1001010 00 53 0 0101010 00 54 1 0101010 00 55 0 1101010 00 56 1 1101010 00 57 0 0011010 00 58 1 0011010 00 59 0 1011010 00 5A 1 1011010 00 5B 0 0111010 00 5C 1 0111010 00 5D 0 1111010 00 5E 1 1111010 00 5F 0 0000110 00 60 1 0000110 00 61 0 1000110 00 62 1 1000110 00 63 0 0100110 00 64 1 0100110 00 65 0 1100110 00 66 1 1100110 00 67 0 0010110 00 68 1 0010110 00 69 0 1010110 00 6A 1 1010110 00 6B 0 0110110 00 6C 1 0110110 00 6D 0 1110110 00 6E 1 1110110 00 6F 0 0001110 00 70 1 0001110 00 71 0 1001110 00 72 1 1001110 00 73 0 0101110 00 74 1 0101110 00 75 0 1101110 00 76 1 1101110 00 77 0 0011110 00 78 1 0011110 00 79 0 1011110 00 7A 1 1011110 00 7B 0 0111110 00 7C 1 0111110 00 7D 0 1111110 00 7E 1 1111110 00 7F

Page 29

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

Page 30

Output signal display (Request code: 175)

Please refer to Table 2 on relevant wiring diagram whilst using the following.

0: OFF 1: ON

OUT

Display

1 2345678 0 0000000 xx 00 1 0000000 xx 01 0 1000000 xx 02 1 1000000 xx 03 0 0100000 xx 04 1 0100000 xx 05 0 1100000 xx 06 1 1100000 xx 07 0 0010000 xx 08 1 0010000 xx 09 0 1010000 xx 0A 1 1010000 xx 0B 0 0110000 xx 0C 1 0110000 xx 0D 0 1110000 xx 0E 1 1110000 xx 0F 0 0001000 xx 10 1 0001000 xx 11 0 1001000 xx 12 1 1001000 xx 13 0 0101000 xx 14 1 0101000 xx 15 0 1101000 xx 16 1 1101000 xx 17 0 0011000 xx 18 1 0011000 xx 19 0 1011000 xx 1A 1 1011000 xx 1B 0 0111000 xx 1C 1 0111000 xx 1D 0 1111000 xx 1E 1 1111000 xx 1F 0 0000100 xx 20 1 0000100 xx 21 0 1000100 xx 22 1 1000100 xx 23 0 0100100 xx 24 1 0100100 xx 25 0 1100100 xx 26 1 1100100 xx 27 0 0010100 xx 28 1 0010100 xx 29 0 1010100 xx 2A 1 1010100 xx 2B 0 0110100 xx 2C 1 0110100 xx 2D 0 1110100 xx 2E 1 1110100 xx 2F 0 0001100 xx 30 1 0001100 xx 31 0 1001100 xx 32 1 1001100 xx 33 0 0101100 xx 34 1 0101100 xx 35 0 1101100 xx 36 1 1101100 xx 37 0 0011100 xx 38 1 0011100 xx 39 0 1011100 xx 3A 1 1011100 xx 3B 0 0111100 xx 3C 1 0111100 xx 3D 0 1111100 xx 3E 1 1111100 xx 3F

0: OFF 1: ON

OUT

Display

1 2345678 0 0000010 xx 40 1 0000010 xx 41 0 1000010 xx 42 1 1000010 xx 43 0 0100010 xx 44 1 0100010 xx 45 0 1100010 xx 46 1 1100010 xx 47 0 0010010 xx 48 1 0010010 xx 49 0 1010010 xx 4A 1 1010010 xx 4B 0 0110010 xx 4C 1 0110010 xx 4D 0 1110010 xx 4E 1 1110010 xx 4F 0 0001010 xx 50 1 0001010 xx 51 0 1001010 xx 52 1 1001010 xx 53 0 0101010 xx 54 1 0101010 xx 55 0 1101010 xx 56 1 1101010 xx 57 0 0011010 xx 58 1 0011010 xx 59 0 1011010 xx 5A 1 1011010 xx 5B 0 0111010 xx 5C 1 0111010 xx 5D 0 1111010 xx 5E 1 1111010 xx 5F 0 0000110 xx 60 1 0000110 xx 61 0 1000110 xx 62 1 1000110 xx 63 0 0100110 xx 64 1 0100110 xx 65 0 1100110 xx 66 1 1100110 xx 67 0 0010110 xx 68 1 0010110 xx 69 0 1010110 xx 6A 1 1010110 xx 6B 0 0110110 xx 6C 1 0110110 xx 6D 0 1110110 xx 6E 1 1110110 xx 6F 0 0001110 xx 70 1 0001110 xx 71 0 1001110 xx 72 1 1001110 xx 73 0 0101110 xx 74 1 0101110 xx 75 0 1101110 xx 76 1 1101110 xx 77 0 0011110 xx 78 1 0011110 xx 79 0 1011110 xx 7A 1 1011110 xx 7B 0 0111110 xx 7C 1 0111110 xx 7D 0 1111110 xx 7E 1 1111110 xx 7F

Page 31

Indoor unit switch setting display (Request code: 175)

Please refer to Table 2 on relevant wiring diagram whilst using the following.

0: OFF 1: ON

OUT

Display

12345678 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 11001001 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 00100101 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

12345678 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 01001011 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 01000111 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

Page 32

Output signal display (Request code: 175)

Please refer to Table 2 on relevant wiring diagram whilst using the following.

0: OFF 1: ON

OUT

Display

9 10111213141516 0 0000000 00 xx 1 0000000 01 xx 0 1000000 02 xx 1 1000000 03 xx 0 0100000 04 xx 1 0100000 05 xx 0 1100000 06 xx 1 1100000 07 xx 0 0010000 08 xx 1 0010000 09 xx 0 1010000 0A xx 1 1010000 0B xx 0 0110000 0C xx 1 0110000 0D xx 0 1110000 0E xx 1 1110000 0F xx 0 0001000 10 xx 1 0001000 11 xx 0 1001000 12 xx 1 1001000 13 xx 0 0101000 14 xx 1 0101000 15 xx 0 1101000 16 xx 1 1101000 17 xx 0 0011000 18 xx 1 0011000 19 xx 0 1011000 1A xx 1 1011000 1B xx 0 0111000 1C xx 1 0111000 1D xx 0 1111000 1E xx 1 1111000 1F xx

Input signal display (Request code: 176)

Please refer to Table 1 on relevant wiring diagram whilst using the following.

0: OFF (open) 1: ON (short)

Display

Page 33

<Thermistor Reading> This function shows the current readings of thermistors located on the water and refrigerant circuit

Thermistor Description

TH1 Room temperature TH2 Refrigerant return temperature THW1 Water flow temperature THW2 Water return temperature TH5A — TH5B Tank temperature TH5C — TH7 Ambient (outdoor) temperature

This function shows the current installer/user entered settings.

Abbreviation

Explanation

Abbreviation

Explanation

HWtemp DHW max temp 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 (—)

Ltemp Legionella hot water temp Hroom Heating target room temp Lfreq Legionella operation Frequency Hflow Heating target flow temp Lstart Legionella mode start time Croom — Ltime Legionella max. operation time Cflow — Lkeep Duration of max (Legionella) hot

water temp

FSflow Freeze stat function flow temp FSout Freeze stat function ambient temp

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).

Page 34

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

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. 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. To return to service menu press MENU or BACK button.

Password input screen

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.

Password verify screen

Completion screen

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 FTC3 or Main Controller. Press F3 button to conﬁ rm manual reset of chosen device.

Page 35

F1 F2 F3 F4

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.

WARNING Do not attempt to change the DIP switches whilst the breaker(s) are ON as this could result in ELECTROCUTION.

Page 36

TROUBLESHOOTING

10-1. Troubleshooting

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  1.0M .

• 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.

Page 37

Error code Title and display conditions Possible Cause Diagnosis and action

L1 Booster heater overheat detection

<DHW/Heating/LP/FS/OS> Error code displayed when THW3 detects temp. of  85ºC for 10 consecutive seconds.

Insufﬁ cient system head

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.

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.

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.

Valve operation fault

Check valves on primary water circuit are installed level.

2-way valve (ﬁ eld supply) actuator fault

Electrically test to determine fault.

3-way valve actuator fault

Electrically test to determine fault.

DHW : Domestic hot water mode Heating : Heating mode LP : Legionella prevention mode FS : Freeze stat OS : Operation stop TH1 : Room temp. thermistor TH2 : Liquid refrigerant temp. thermistor THW1 : Flow water temp. thermistor THW2 : Return water temp. thermistor THW3 : Booster heater temp. thermistor THW5B : Tank water temp. thermistor

Booster heater relay (BHC1, BHC2, BHCP) operating fault

Electrically test the relays (BHC1, BHC2, BHCP) to determine fault. See 10-6. for how to check.

Power supply voltage increase

Check the supply voltage.

THW1 has become detached from its holder.8Visually inspect location and reattach as

necessary.

THW3 fault

Check resistance of thermistor against table in section 10-6. Compare FTC3 detected temperature to hand held detector.

FTC3 board failure

Replace board.

L2 Booster heater thermistor (THW3) failure

<DHW/Heating/LP/FS> Error code displayed when THW3 is at open ( 1.31ºC) or short ( 219.42ºC).

Exceptions Error code will not be displayed if; During defrost and 10 mins after defrost operation, For 10 mins after pump1 is switched on, When THW1 < 10deg.

Connector/terminal wire has become detached or loose wiring.

Visually check the terminals and connections and reattach as appropriate.

THW3 fault

Check resistance of thermistor against table in section 10-6. Compare FTC3 detected temperature to hand held detector.

FTC3 board failure

Replace board.

L3 Circulation water temperature overheat

protection

Error code displayed when THW1 detects a temp.  80ºC for 10 consecutive seconds or THW2 detects a temp  80ºC for 10 consecutive seconds.

Insufﬁ cient system head

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.

Valve operation fault

Check valves on primary water circuit are installed level.

2-way valve (ﬁ eld supply) actuator fault

Electrically test to determine fault.

3-way valve actuator fault

Electrically test to determine fault.

Booster heater relay (BHC1, BHC2, BHCP) operating fault

Electrically test the relays (BHC1, BHC2, BHCP) to determine fault. See 10-6. for how to check.

Power supply voltage increase

Check the supply voltage.

THW1 or THW3 or THW5B has become detached from its holder.

Visually inspect location and reattach as necessary.

THW1 or THW2 fault

Check resistance of thermistor against table in section 10-6. Compare FTC3 detected temperature to hand held detector.

FTC3 board failure

Replace board.

10-4. Self diagnosis and action

Check if Dip SW is set correctly. (Refer to Chapter 6-10.)

The components associated with the DHW tank are ﬁ eld-supplied.

Page 38

Error code Title and display conditions Possible Cause Diagnosis and action

Tank water temperature overheat protection

<DHW/Heating/LP/FS/OS> Error code display when THW5B detects a temp.  75ºC for 10 consecutive seconds.

3-way valve actuator fault

Electrically test to determine fault.

Immersion heater relay (IHC) operating fault2Check immersion heater relay (IHC)

See 10-6. for how to check.

THW5B fault

Check resistance of thermistor against table in section 10-6. Compare FTC3 detected temperature to hand held detector.

FTC3 board failure

Replace board.

L5 Indoor unit temperature thermistor

(TH1, TH2, THW1, THW2, THW5B) failure

<DHW/Heating/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.

Connector/terminal wire has become detached or loose wiring.

Visually check the terminals and connections and reattachas appropriate.

Thermistor fault

Check resistance of thermistor against table in section 10-6. Compare FTC3 detected temperature to hand held detector.

FTC3 board failure The thermistor on the wireless remote controller or the main remote controller may be defective.

Replace board.

Incorrect setting of the Dip switch(es)

Check the Dip switch setting(s).

L6 Circulation water freeze protection

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, Water circulation pump1 runs for 10 mins.

Insufﬁ cient system head

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.

Valve operation fault

Check valves on primary water circuit are installed level.

2-way valve (ﬁ eld supply) actuator fault

Electrically test to determine fault.

3-way valve actuator fault

Electrically test to determine fault.

THW1 has become detached from its holder.6Visually inspect location and reattach as nec-

essary.

THW1 or THW2 fault

Check resistance of thermistor against table in section 10-6. Compare FTC3 detected temperature to hand held detector.

FTC3 board failure

Replace board.

Thermistor

Open detection Short detection

Symbol Name TH1 Room temperature thermisitor -39.0ºC or below 88.5ºC or above TH2 Liquid temperature thermisitor -39.0ºC or below 88.5ºC or above THW1 Flow water temperature thermisitor -39.0ºC or below 88.5ºC or above THW2 Return water temperture thermisitor -39.0ºC or below 88.5ºC or above THW5B Tank water temperture thermisitor -39.0ºC or below 88.5ºC or above

Page 39

Error code Title and display conditions Possible Cause Diagnosis and action

L7 3-way valve failure (Valve direction

defaults to DHW circuit)

Error code displayed when the THW1 temp. detects  1ºC increase in 20 consecutive minutes and THW5B increases  1ºC increase in 20 consecutive minutes after both compressor and booster heater are OFF then one is switched on.

Exception If simultaneous Heating and DHW operation is selected error code will not be displayed.

3-way valve actuator fault

Electrically test to determine fault.

THW1 or THW5B fault

Check resistance of thermistor against table in section 10-6. Compare FTC3 detected temperature to hand held detector.

FTC3 board failure The thermistor on the wireless remote controller or the main remote controller may be defective.

Replace board.

Incorrect setting of the Dip switch(es)

Check the Dip switch setting(s)

THW1 or THW5B has been detached from its holder.

Visually inspect location and reattach as necessary.

L8 Heating operation error

<Heating/FS> Error code is displayed when the following 3 conditions are met;

• When THW1 temp. detects  1 ºC increase

in 20 consecutive minutes and THW5B increases  1 ºC in 20 consecutive minutes after both compressor and booster eater areOFF then one is switched on.

•

When THW1 temp. detects  1 ºC increase in 10 consecutive minutes after booster heater is switched from OFF to ON.

•

When THW1-THW2 < -5 ºC for 10 consecutive minutes.

THW1 has become detached from its holder.

Visually inspect location and reattach as necessary.

Booster heater fault

Electrically test to determine fault. See 10-6. for how to check.

THW1 or THW2 or THW5B fault

Check resistance of thermistor against table in section 10-6.

Compare FTC3 detected temperature to hand held detector.

FTC3 board failure

Replace board.

L9 Low primary circuit ﬂ ow rate detected by

ﬂ ow switch

<DHW/Heating/LP/FS> Error code displayed when ﬂ ow switch detects low ﬂ ow rate for 10 seconds.

Insufﬁ cient system head

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.

Valve operation fault

Check valves on primary water circuit are installed level.

2-way valve (ﬁ eld supply) actuator

fault

Electrically test to determine fault.

Connector/terminal wire has become detached or loose wiring.

Visually check the CN2 connector and IN2 terminal and reattach if necessary.

Flow switch fault

Electrically test to determine fault. See 10-6. for how to check.

FTC3 board failure Incorrect setting of SW2-2.

Replace board.

Incorrect setting of the SW2-2

Check the SW2-2 setting.

Page 40

Error code Title and display conditions Possible Cause Diagnosis and action

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.

Contact failure with transmission cable

Check connection cable for damage or loose connections at the FTC3 and main controller terminals.

Wiring procedure not observed. (Cable length/cable diameter/number of indoor units/number of main controllers)

Check main controller and FTC3 common wiring max cable length 500 m. Only use 2 core cable. Only connect 1 main controller to 1 FTC3 indoor unit board.

Fault on the indoor unit FTC3 board section controlling Ref. address "0"

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 FTC3 and/or the main controller circuit board should be replaced.

Fault with the main controller circuit board

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 find 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 FTC3 can not find an empty transmission path for 3 mins and thus cannot transmit or the data sent by the FTC3 is different to what was expected 30 consecutive times.

2 or more main controllers have been connected to the FTC3.

Only connect 1 main controller to 1 FTC3 indoor unit board.

Fault with main controller transmission/receiving circuit board

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 FTC3 and/or the main controller circuit board should be replaced.

Fault with the main controller circuit board

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 FTC3 board does not receive any signal or the signal receivedis not complete for 6 mins, or after a period of operation the FTC3 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.

Contact failure/short circuit/miswiring

Check the connections on the indoor and outdoor units have not become loose and that the connecting cable is not damaged.

Fault with outdoor unit transmission/receiving circuit board

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 FTC3 and/or the outdoor unit circuit board should be replaced.

Fault with FTC3 transmission/receiving circuit board

Electrical noise causes interference with FTC3-Outdoor unit transmission cable.

Page 41

Error code Title and display conditions Possible Cause Diagnosis and action

E7 Indoor/outdoor communication failure

(Transmission error)

Error code E7 is displayed if despite the FTC3 board sending signal "0", signal "1" is received 30 consecutive times.

Fault with FTC3 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 FTC3 circuit board should be replaced.

Electrical noise causes interference with power supply.

Electrical noise causes interference with FTC3-outdoor unit transmission cable.

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.

Fault with the main controller circuit board

Replace main controller circuit board.

J0 Indoor unit/wireless receiver communi-

cation failure

Error code J0 is displayed when the FTC3 can not receive data from the wireless receiver for 1 min.

Connection fault with wireless receiverFTC3 connection

Check the connections to the wireless receiver and FTC3 have not become loose and that the connecting cable is not damaged.

Fault with FTC3 receiving circuit board

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 FTC3 and/ or the wireless receiver circuit board should be replaced. replaced.

Fault with wireless receiver's transmission circuit board

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.

Battery on wireless remote control may be ﬂ at

Check and replace the battery if necessary the wireless remote controller battery.

The wireless remote controller is out of range of the wireless receiver.

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.

Fault with wireless remote controller transmission circuit board

Fault with wireless receiver's reception circuit board

Note: To cancel error codes please switch system off (press button F4 (RESET) on main controller).

Page 42

BLACK

YELLOW

CNO1

Black

Hydrobox control board

FTC3 powered via outdoor unit.

YELLOW

BLACK

CNO1

Black

Hydrobox control board

FTC3 powered from independednt source.

10-5. Troubleshooting by inferior phenomena

No. Fault symptom Possible cause Explanation - Solution

1 Main controller display

does not work.

1. There is no power supply to main controller. 1. Check LED2 on FTC3. (i) When LED2 is lit.

Check the main controller wiring for damage or contact failure.

(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 is not visible.

2. Check the following.

• Failure of 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 mins. 1. Normal operation.

2. Communication failure between the main

controller and FTC3.

2, 3.

Main controller start up checks/procedure. (i) If main controller - FTC3 can not communicate the number displayed

under "Please Wait" is 0%, or 50-99%.

• Check wiring connections on main controller

• Replace main controller or FTC3 boards.

(ii) If 1-49% is displayed there is a communication errorbetween the outdoor

unit's and FTC3's boards.

• Check the wiring connections on the outdoor unit and FTC3 boards. (Ensure S1, S2 are not cross wired and S3 is securely connected and not damaged.)

• Replace the outdoor unit's and/or the FTC3's boards.

3. Communication failure between FTC3 and outdoor unit.

3 When pressing the

"ON" button, the main screen is shown brieﬂ y then disappears.

If whilst changing the settings in the service menu, the system is shut down. When you return to the main screen you may have to wait a short while before the "ON" button will work.

Normal operation. The unit is processing the recent service menu changes and will be operational shortly.

4 LED2 on FTC3 is off. When LED1 on FTC3 is also off.

1. Power supply of rated voltage is not supplied to outdoor unit.

1. Check the voltage of outdoor power supply terminal block (L,N) or (L3,N).

• When AC220~240V is not detected, check the power wiring to outdoor unit and the breaker.

• When AC 220~240V is detected, check 2 (below).

2. Defective outdoor controller circuit board. 2. Check the voltage between outdoor terminal block S1 and S2.

• When AC 220~240V is not detected, check the fuse on outdoor controller circuit board, check the wiring connection.

• When AC 220~240V is detected, check 3 (below).

3. Power supply of AC 220~240V is not supplied to FTC3.

3. Check the voltage between indoor terminal block S1 and S2.

• When AC 220~240V is not detected, check FTC3/outdoor unit connecting wire for miswiring.

• When AC 220~240V is detected, check 4 (below).

4. Defective FTC3. 4. Check the fuse on FTC3.

• Check the wiring conection.

If no problems are found, FTC3 board is defective.

5. There are problems in the method of connecting the connectors.

5. Check that there is no problem in the method of connecting the connectors.

• When there are problems in the method of connecting the connectors, connect the connector correctly referring to below.

1. Power supply of AC 220~240V is not supplied to FTC3.

1. Check the voltage of indoor power supply terminal block (L,N).

• When AC220~240V is not detected, check the power supply wiring.

• When AC220~240V is detected, check 2 (below).

2. There are problems in the method of connecting the connectors.

2. Check that there is no problem in the method of connecting the connectors.

• When there are problems in the method of connecting the connectors, connect the connector correctly referring to below.

• When there is no problem in the method of connecting the connectors, check 3 (below).

3. Defective FTC3. 3. Check the fuse on FTC3.

• Check the wiring connection.

If no problems are found, FTC3 board is defective.

When LED1 on FTC3 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.)

Miss-setting of refrigerant address for outdoor unit. (None of the refrigerant address is set to "0".)

Page 43

No. Fault symptom Possible cause Explanation - Solution

5 LED2 on FTC3 is blink-

ing.

When LED1 on FTC3 is also blinking. Check FTC3/outdoor unit connecting wire for connection failure.

Connection failure of FTC3/outdoor unit connecting wire

When LED1 on FTC3 is lit.

1. Miswiring of main controller wires Multiple indoor units have been wired to 1 outdoor unit.

1. Check the connection of main controller wires. Only 1 indoor unit should be wired to 1 outdoor unit. Supplementary indoor units should each be wired to a separate outdoor unit.

2. Miss-setting of refrigerant address for outdoor unit (Outdoor unit refrigerant address should be set to "0")

2. 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.)

3. Short-circuit of main controller wires 3, 4.

4. Defective main controller Remove main controller wires and check LED2 on FTC3.

• If LED2 is blinking check the main controller wires are not short circuiting.

• If LED2 is lit, connect main controller wires again and:

- if LED2 is blinking, main controller is defective;

- if LED2 is lit, connection failure of main controller terminal block etc. has returned to normal.

6 No water at hot tap. 1. Cold main off

Check and open stop cock.

2. Strainer (ﬁ eld supply) blocked.

Isolate water supply and clean strainer.

7 Cold water at tap. 1. All hot water used. 1. Ensure DHW mode is operating and wait for tank to re-heat.

2. Prohibit, schedule timer or holiday mode selected.

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 has triggered. 4. Check booster heater thermostat and press reset button if safe.

Reset button is covered with white rubber cap see component parts diagram section 10-6. for position.

Booster heater breaker (ECB1) has tripped.

5. Check the cause of the trip and reset if safe.

6. The booster heater thermal cut-out has operated and can not be reset using the manual reset button.

6. Check the resistance of the thermal cut out, if open then the connection is broken and the booster heater will have to be replaced. Please contact your Mitsubishi Electric dealer.

7. Immersion heater cut out has triggered. 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.

Immersion heater breaker (ECB2) has tripped.

8. Check the cause of the trip and reset if safe.

9. 3-way valve (2-way valve) (field supply)

fault

9. Check plumbing/wiring to 3-way valve (2-way valve) (ﬁ eld supply).

8 It takes long for water

to boil.

1. Heat pump not working. 1. Check heat pump – consult outdoor unit service manual.

2. Booster heater cut out has triggered. 2. Check booster heater thermostat and press reset button if safe. Reset button is covered with white rubber cap see component parts diagram section 10-6. for position.

Booster heater breaker (ECB1) has tripped.

3. Check the cause of the trip and reset if safe.

4. The booster heater thermal cut-out has

operated and can not be reset using the manual reset button.

4. Check the resistance of the thermal cut out, if open then the connection is broken and the booster heater will have to be replaced. Please contact your Mitsubishi Electric dealer.

5. Immersion heater cut out has triggered. 5. 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.

Immersion heater breaker (ECB2) has tripped.

6. Check the cause of the trip and reset if safe.

9 Water in tank is not

used, but the water tempearature of the tank decreases.

The water temperature decreases to a certain degree as the tank heat radiates when DHW or Heating opeartion is not running. If the temperature decreases excessively and boiling occurs frequently, check for the following.

1. Water leakage through the pipes that connect to the tank

1. Take the following measures.

• Retighten the nuts holding the pipes onto the tank.

• Replace seal materials.

• Replace the pipes.

2. Peeling off of insulation 2. Reattach insulation.

3. 3-way valve (2-way valve) (field supply) fault

3. Check plumbing/wiring to 3-way valve (2-way valve) (ﬁ eld supply).

10 Hot or warm water from

cold tap.

If tap runs cold after a minute or so the pipe is picking up heat from heating pipe work.

Insulate/re-route pipe work.

11 Water Leak 1.

Poorly sealed connections on water circuit parts

1. Tighten connections as required.

Water circuit components are approaching limit of the usable life.

2. Refer to PARTS CATALOG for expected part lifetimes and replace as necessary.

Page 44

No. Fault symptom Possible cause Explanation - Solution

12 Heating system does

not get up to 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 room in which the temperature sensor is located is at a different temperature to the rest of the house.

3. Reposition 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 has triggered. 5. Check booster heater thermostat and press reset button if

safe. Reset button is covered with white rubber cap see component parts diagram section 10-6. for position.

Booster heater breaker (ECB1) has tripped.

6. Check the cause of the trip and reset if safe.

7. The booster heater thermal cut-out has operated and can not be reset using the manual reset button.

Check the resistance of the thermal cut out, if 0 then the connection is broken and the booster heater will have to be replaced. Please contact your Mitsubishi Electric dealer.

8. Incorrectly sized radiators 8. Contact installer

9. 3-way valve

(2-way valve) (ﬁ eld supply)

fault 9. Check plumbing/wiring to 3-way valve (2-way valve) (ﬁ eld

supply).

10. Battery problem *wireless control only 10. Check the battery power and replace it ﬂ at.

13 After DHW operation

room temperature rises a little.

At the end of the DHW mode operation the 3-way valve

(2-way

valve) (field supply)

diverts hot water away from the hydrobox 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 is dependent on the type of system and the pipe run between the plate heat exchanger and the hydrobox.

Normal operation no action necessary.

The room temperature rises during DHW operation.

3-way valve (2-way valve) (ﬁ eld supply) fault Check the 3-way valve (2-way valve) (ﬁ eld supply).

15 Water discharges from

pressure relief valve. (Primary circuit)

1. If continual – pressure relief valve seat may be damaged. 1. Remove cartridge – check seat and renew if necessary.

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 vessel.

3. System was excessively pressurised at ﬁ ll stage. 3. Ensure the ﬁ ll connection has been physically DISCONNECT- ED from the mains water supply. With hydrobox cold check pressure in hydrobox. If necessary, discharge/re-ﬁ ll system to the recommended cold-ﬁ ll pressure of 1 bar.

4. Unit has overheated – thermal controls have failed. 4. Switch off power to the heat pump. Leave water supply on. Wait until discharge stops. Isolate water supply and replace if faulty.

16 Water discharges from

pressure relief valve. (Sanitary circuit)

If continual – ﬁ eld 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. Remove cartridge – check seat and renew if necessary.

3. Check pressure in expansion vessel. Recharge to correct precharge pressure if necessary. If bladder perished replace vessel.

3. If intermittent – expansion vessel charge may have reduced/bladder perished.

4. Unit is being back pressurised. 4. With cylinder cold, check pressure in cylinder. If this is the

same as the incoming mains pressure then you are getting back feed. Install a balanced cold supply.

18 Noisy pump Air in pump. Use manual and automatic air vents to release excess air from

system. Top up water if necessary to achieve 1bar on primary circuit.

19 Noise during hot water

draw off typically worse in the morning.

Loose airing cupboard pipework. Heaters switching on/off.

Install extra pipe fastening clips.

20 Mechanical noise

heard coming from the hydrobox.

1. Heaters switching on/off. Normal operation no action necessary.

2. 3-way valve (ﬁ eld supply) changing position between DHW

and heating mode.

21 Pump runs for a short

time for no reason.

Pump jam prevention mechanism to inhibit the build up of scale. Normal operation no action necessary.

22 Milky/Cloudy water

(Sanitary circuit)

Oxygenated water Water from any pressurised system will release oxygen bubbles

when ﬂ owing. The bubbles will settle out.

Heating mode has been on standby for a long time (does not start operation smoothly.)

Duration is set to excessively short time at “Economy setting for pump”. (Go to “Service menu”  “Auxiliary setting”  “Economy setting for pump”).

Set “Economy setting for pump” longer.

Heating emitter is hot in the DHW mode. (The room temperature rises.)

1. The 3-way valve may have foreign objects in it, or hot

water may ﬂ ow to the heating side due to malfunctions.

1. Manually override the 3-way valve several times to check whether the problem will be solved. (Refer to the service manual.) If the problem persists replace the 3-way valve coil with a new one. If still no change replace the entire 3-way valve with a new one.

2. 2-way valve (ﬁ eld supply) has tripped. 2. Check the cause of the trip and check plumbing/wiring to 2-way valve (ﬁ eld suppl).

Page 45

10-6. Checking Component Parts' Function

Part Name Check Points

Water circulation pump Measure the resistance between the terminals with a tester.

(Winding temperate 20 °C)

Terminal Normal Abnormal

L - N 121 Open or Short

Earth leakage 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.

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

* I f the water ﬂ ow rate is less than 7.1 L/min, the ﬂ ow switch will be activated.

If the water ﬂ ow rate exceeds 27.7 L/min, the ﬂ ow speed will be greater than

1.5 m/s, which could corrode the pipes.

EHSC series

EHPX series

speed3

(Default setting)

speed2 speed1

External static pressure[kPa]

Flow rate[L/min] Flow rate[L/min]

30 40

10 20 50

30 40

10 20 50

External static pressure[kPa]

speed3

(Default setting)

speed2 speed1

Heating emitter is hot in the DHW mode. (The room temperature rises.)

1. The 3-way valve may have foreign objects in it, or hot water may ﬂ ow to the heating side due to malfunctions.

2. 2-way valve (ﬁ eld supply) has tripped. 2. Check the cause of the trip and check plumbing/wiring to 2-way valve (ﬁ eld suppl).

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.

Page 46

Part Name Check Points

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

Terminal Normal Abnormal

9-10 110(±35)m Open or Short

2kW heater (230V, 1 phase)

2kW

AWG15 FEP

WHITE

AWG15 FEP

WHITE

Terminal Normal Abnormal

1-2 26.5(+3/-1.3) Open or Short

2 + 4kW heater (230V, 1 phase)

2kW

AWG15 FEP

WHITE

AWG15 FEP

WHITE

2kW

AWG13 FEP

BLUE

AWG13 FEP

BLUE

2kW

Terminal Normal Abnormal

1-2 26.5(+3/-1.3) Open or Short 3-4 13.3(+1.5/-0.6) Open or Short

3 + 6kW heater (400V, 3 phase)

AWG15 FEP

WHITE

AWG15 FEP

WHITE

AWG13 FEP

BLUE

2kW

AWG15 FEP

WHITE

2kW 2kW

1kW

1kW 1kW

AWG13 FEP

BLUE

AWG13 FEP

BLUE

Terminal Normal Abnormal

1-2=2-3=1-3 105.8(+11.8/-5) Open or Short 4-5=5-6=4-6 52.9(+5.8/-2.5) Open or Short

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.)

Thermistor Normal Abnormal

TH1

4.3 - 9.5 k

Open or short

TH2 THW1 THW2 THW5B THW3 160 - 410 k

Flow

Page 47

Thermistor R120 = 7.465k ± 2% B constant = 4057 ± 2%

Rt = 7.465exp {4057(

273+t – 393

)}

20°C 250k 30°C 160k 40°C 104k 50°C 70k 60°C 48k

70°C 34k 80°C 24k 90°C 17.5k 100°C 13.0k 110°C 9.8k

• Booster heater temperature thermistor (THW3)

-20 -10 0 10 20 30 40 50

Temperature ()

Resistance (k)

500

400

300

200

100

50 75 100 120

Temperature ()

Resistance (k)

• Room temperature thermistor (TH1)

• Liquid refrigerant temperature thermistor (TH2)

• Flow water temperature thermistor (THW1)

• Return water temperature thermistor (THW2)

• DHW tank temperature thermistor (THW5B)

0°C 15k 10°C 9.6k 20°C 6.3k 25°C 5.2k 30°C 4.3k 40°C 3.0k

Thermistor R0 = 15k ± 3% B constant = 3480 ± 2%

Rt = 15exp {3480 (

273+t

–

273

)}

Page 48

10-7. Test point diagram

FTC3 (Controller board)





































































CN3C Transmission (Indoor/outdoor) (0~24V DC)

LED2 Power supply (Main controller)

LED1 Power supply (FTC3)

LED3 Transmission (Indoor/outdoor)

CNP/OUT1 (TBO.1 1-2) Water circulation pump1 (230V AC)

6.3A/250V

CN01 Power supply (230V AC)

6.3A/250V

VDD 5V (DC5V ± 0.25V)

VDD 13V (DC13V ± 0.6V)

IN4 (TBI.2 13-14) Heat source OFF input

OUT2 (TBO.1 3-4) Water circulation pump2 (field supply) (230V AC)

CNV1/OUT4 (TBO.1 7-9) 3-way valve (field supply) (7-8:230V AC) OUT4 (TBO.1 7-8) 2-way valve (field supply) (7-8:230V AC)

CNBHT/BHT (TBO.2 1-2) Thermostat input for booster heater

CNBC/BC (TBO.2 3-4) Signal output for booster heater protection (230V AC)

CNBH(1-3)/OUT6 (TBO.2 5-6) Signal output for booster heater1 (230V AC)

CNBH(5-7)/OUT7 (TBO.2 7-8) Signal output for booster heater2 (230V AC)

OUT8 (TBO.2 9-10) Signal output for booster heater2+ (230V AC)

OUT11 (TBO.2 11-12) Signal output (Error) (230V AC)

OUT12 (TBO.2 13-14) Signal output (Defrost) (230V AC)

CNIHT/IHT (TBO.3 1-2) Thermostat input for immersion heater (field supply)

CNIH/OUT9 (TBO.3 5-6) Signal output for immersion heater (field supply) (230V AC)

TH1/TH1 (TBI.1 1-2) Thermistor (Room temperature)

TH2/TH2 (TBI.1 3-4) Thermistor (Ref. liquid temperature)

THW12(1-2)/ THW1(TBI.1 5-6) Thermistor (Flow water temperature)

THW12(3-4)/ THW2(TBI.1 7-8) Thermistor (Return water

temperature)

THW5(3-4)/ THW5B(TBI.1 11-12) Thermistor (Tank water temperature)

THW3/ THW3(TBI.2 3-4) Thermistor (Booster heater temperature)

IN1(TBI.2 5-6) Room thermostat input

CN2F/IN2(TBI.2 7-8) Flow switch input

CN22/RC(TBI.2 11-12) Main controller (10.4 - 13.7 V DC)

IN5 (TBI.3 7-8) Outdoor thermostat input

OUT13 (TBO.3 7-8) 2-way valve2 (field supply) (7-8:230V AC)

Page 49

DISASSEMBLY PROCEDURE

PHOTOS & ILLUSTRATION

EHSC-VM6A, EHSC-YM9A, EHPX-VM2A

Photo 1-1

Photo 1-2

Photo 2-1

Figure 1

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. When draining the hydrobox, keep water from splashing on the internal parts (mainly electric parts and insulations).

 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.

1. How to remove the front panel

(1) Remove the 2 painted screws at the bottom of the hydrobox. (Photo

(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 1)

Painted screws

Front panel

Main controller

Connector

Front panel

Screws

Controller support

Page 50

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 breaker> (Photo 3-2)

(4) Disconnect all the lead wires from the earth leakage

breaker. (5) Remove the 2 screws on the earth leakage breaker. 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.

<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 7 board supports.

Photo 3-2

w The photos shown are of the EHSC model.

Terminal block (TB1)

Earth leakage breaker (ECB1)

Contactors

Control box

Controller board

Screw

Photo 3-1

Control box cover fixing screws

Control box cover

Controller board

Page 51

DISASSEMBLY PROCEDURE

PHOTOS

Photo 4-1

Photo 4-2

w 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 2 screws from the 2 control box brackets (R). (3) Remove the cable straps. (4) Disengage the 2 control box brackets (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

Cable straps

Earth cable

Brackets (R)

Side panel

Swing

Screw

Page 52

Band

Pump valve

Nut (1-1/2")

Pump support under

Photo 5-3

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 and the earth cable in

the control box. (Photo 5-1)

(4) Release the water pump lead wire from the 3 cable

clamps, the cable strap, the fastener and 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 1-1/2"

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, 5-3)

w 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 5-5)

w 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)

w When reinstalling the 1-1/2" nuts, use new 1-1/2"

gaskets. (Photo 5-4)

(8) Remove the pump valves by removing the 1" nuts using

two spanners: one to hold the pump and the other to turn each 1" nut . (Photo 5-2)

w When reinstalling the 1" nuts, use new 1" gaskets. w 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 5-5)

w 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 5-4

Pump support top

Nut (1")

Pump valve

Water pump

Nut (1")

Pump valve

Nut (1-1/2")

Water pump connector (CNP1)

Earth cable

Cable clamps

Cable strap

Coated clamp

Fastener

Screw

Nut (1-1/2")

Gasket 1-1/2"

Coated clamps

Terminal box

Screw

Lead wire

Gasket (1")

Photo 5-5

Pump valve

Stem

Page 53

DISASSEMBLY PROCEDURE

PHOTOS

Flow switch

Pipe

Lead wire

Photo 6-1

Water pipe

Flow switch

Flow switch connector (CN2F)

Cable clamps

Cable strap

Coated clamp

Fastener

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 3 cable

clamps, the cable strap, the fastener and 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)

w 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 2)

Flow

Figure 2

Nut

Lead wire

Page 54

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 and the THW3 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)

w THW3 will be used later.

(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 1" nuts. (Photo 7-2)

w When reinstalling the 1" nuts, use new 1" gaskets.

(7) Remove the flare nut using two spanners (Photo 7-2):

one to hold the flare joint and the other to turn the flare nut.

(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)

Model Lead wire No. Contactor

EHSC-VM6A No.1 BHC1-U

No.2 BHC1-V

No.3 BHC2-U

No.4 BHC2-V

EHSC-YM9A No.1 BHC1-U

No.2 BHC1-V

No.3 BHC1-W

No.4 BHC2-U

No.5 BHC2-V

No.6 BHC2-W

EHPX-VM2A No.1 BHC1-U

No.2 BHC1-V

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

Fastener

Coated clamp

Earth leakage breakers (ECB1)

Connector (CNBHT)

Connector (THW3)

Cable clamp

Flare joint

Booster heater

Drain cock

Nut (1")

Screws

Flare nut

Pump valve (upper)

Control box

Nut (1")

Heater stay

Screw

Gasket (1")

w The photos shown are of the EHSC-VM6A model.

Back panel

Page 55

DISASSEMBLY PROCEDURE

PHOTOS

Photo 7-4

(12) Cut the band bundling the THW3 cable. (Photo 7-5) (13) Pull down the thermistor cable and remove the THW3

thermistor.

7. How to remove the booster heater (continued)

(10) Remove the flare joint from the booster heater. (Photo

7-4)

w When reinstalling the flare joint, use a new 3/8"

gasket.

(11) Remove the drain cock (primary circuit) from the booster

heater. (Photo 7-4)

w Replace the removed drain cock (primary circuit).

The drain cock can not be reused.

Drain cock

Photo 7-5

Band

Thermistor cable

Flare joint

Booster heater

(Bottom view of the booster heater）

Gasket (3/8")

Page 56

Band

Pump valve (lower)

Nut (1-1/2")

Pump support under

Photo 8-3

DISASSEMBLY PROCEDURE

PHOTOS

Nut (1")

Photo 8-1

(7) Remove the pump support top by removing the 2 screws

that hold it to the pump support under. 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) Cut the band that fixes the water pump to the pump

support under. (Photo 8-3)

(10) Close the pump valve (lower) and remove the 1-1/2" nut

using two spanners: one to hold the pump valve and the other to turn the nut. w When reinstalling the 1-1/2" nut, use a new 1-1/2"

gasket. (Photo 5-4)

(11) Remove the 1" nut (upper) on the booster heater and

the water pump with the pump valve and the water pipe. (Photo 8-2) w When reinstalling the 1" nut, use a new 1" gasket.

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 3 cable

clamps, the cable strap, the fastener and 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.)

Water pump connector (CNP1)

Earth cable

Cable clamps

Cable strap

Coated clamp

Fastener

Coated clamp

Control box

Photo 8-2

Nut (1")

Water pump

Pump valve (lower)

Nut (1-1/2")

Screw

Nut (1-1/2")

Nut (1")

Booster heater

Nut (1")(upper) Gasket (1")

Rubber mount

Flow switch

Band

Strainer

Pressure relief valve

THW1

TH2

Flexible hose

Pump valve (upper)

Pump support under

Pump support top

Gasket (1")

Gasket (1-1/2")

Gasket (1")

Page 57

DISASSEMBLY PROCEDURE

PHOTOS

8. How to remove the plate heat exchanger (continued)

(12) Remove the pump support under by removing the 4

screws. (Photo 8-4)

Note: To avoid dropping of the pump support under,

hold it by hand when removing the last screw.

(13) Remove the 1" nut on the flexible hose end that

connects to the booster heater. (Photo 8-2)

w When reinstalling the 1" nut, use a new 1" gasket.

(14) Remove the 1" nut on the water outlet side of the

strainer using two spanners: one to hold the strainer

and the other to turn the 1" nut. (Photo 8-2)

(15) Remove the rubber mount by cutting the band.

(Photo 8-2)

(16) Remove the flow switch. (Refer to Procedure 6.)

w Do not remove the CN2F connector on the controller

board.

w When reinstalling the flow switch, use a new O-ring.

(17) 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.

(18) Remove the plate heat exchanger cover by removing

the 2 screws. (Photo 8-5)

(19) Remove the plate heat exchanger assembly from the

hydrobox. Cut the band and remove the flexible hose

by removing the 1" nut at the top of the plate heat

exchanger. Remove the 1" nut at the bottom of the

plate heat exchanger. (Photos 8-6, 8-7)

w When reinstalling the 1" nuts, use new 1" gaskets.

Photo 8-4

Pump support under

Screw

Photo 8-5

Plate heat exchanger cover

Screws

Photo 8-6

Nut (1")

Flexible hose

Band

Refrigerant piping

Plate heat exchanger

Photo 8-7

Nut (1")

Refrigerant piping

Nut (1")

Gasket (1")

Page 58

DISASSEMBLY PROCEDURE

PHOTOS

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).

w 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 5-5)

(4) Remove the two 1" nuts using two spanners: one to hold

the strainer and the other to turn the individual 1" nuts. w When reinstalling the 1" nuts, use new 1" gaskets

(4) Remove the cover with two spanners: one to hold the

strainer and the other to turn the cover. w Be sure to reattach the mesh after washing. (Photo 9-2)

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.)

(3) Remove the 2 screws on the manometer stay under the

hydrobox and remove the manometer stay by pulling down the manometer stay while tilting the stay to the front. (Photo 10-1)

(4) Remove the 1/4" nut, release the capillary tube from

the cable clamp, and feed the capillary tube through the bottom out the hydrobox.

When reinstalling the 1/4" nut, use a new 1/4" gasket.

(Photo 10-2)

(5) Remove the manometer from the manometer stay while

pressing on the claws. (Photo 10-3) w 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.

(3) Remove the field piping from the pressure relief valve. (4) Remove the manometer by removing the 1/4" nut.

When reinstalling the 1/4" nut, use a new 1/4" gasket.

(Photo 10-2)

(5) Cut the band and remove the rubber mount. (

Photo 10-2

)

(6) Remove the flare nut 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 adaptor and the other to turn the pressure relief valve. (Photo 10-4)

Photo 10-3

Photo 9-1

Photo 10-1

Manometer

Nut (1")

Strainer

Strainer valves

Manometer stay

Screws

Photo 10-2

Nut (1/4")

Capillary tube

Cable clamp

Capillary tube

Claw

Rubber mount

Band

Pressure relief valve

Band

Nut (1")

Flare nut

Cover

Photo 10-4

Flare joint

Pressure relief valve

Adaptor

Root

Gasket (1/4")

Claw

Manometer

Gasket (1")

Strainer mesh

Cover

O-ring

Photo 9-2

Page 59

DISASSEMBLY PROCEDURE

PHOTOS

10. How to remove the manometer / pressure relief valve / air vent (automatic) (Continued)

(4) 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.

(5) 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) w When reinstalling the flare joint, use a new 3/8" 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 3/8"

Page 60

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. (4) Cut the pipe cover tape about 10 cm from the top and

peel off the pipe cover. (Photo 13-1)

w 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) w When reinstalling the nuts, use new 1" gaskets.

Photo 12-1

Drain cock

Booster heater

Photo 13-1

Nut (1")

Refrigerant piping

Nut (1")

Flexible hose

Plate heat exchanger

Band

Photo 13-2

Nut (1")

Flexible hose

Ta pe

Gasket (1")

Nut (1")

Gasket (1")

Flexible hose

Gasket (1")

Page 61

DISASSEMBLY PROCEDURE

PHOTOS

Photo 14-1

Photo 15-1

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 fastener 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 15-1)

15. How to remove the thermistor <booster heater> (THW3)

(1) Remove the front panel. (Refer to Procedure 1.) (2) Remove the control box cover. (Refer to Procedure 3.) (3) Disconnect the THW3 connector on the control board.

(Photo 14-1) (4) Release the THW3 lead wire from the cable clamp, the

cable strap, the 2 fasteners and the 2 coated clamps.

Feed the lead wire out the control box without putting

strain on the THW3 connector. (5) Swing the control box to the front. (Refer to Procedure 4.) (6) Cut the band. (Photo 15-1)

(7) Pull down the thermistor cable from the booster heater and

remove the THW3 thermistor. (Photo 15-1)

Cable clamp

Cable strap

Coated clamp

Fastener

Coated clamp

Earth leakage breakers (ECB1)

Connectors (THW1) (THW2) (THW3) (TH2)

Control box

TH2 thermistor

THW1 thermistor

THW2 thermistor

Coated clamps

Fastener

Band

THW3 thermistor cable

Page 62

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.

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.

PARTS CATALOG

Recommended tightening torque [Nm] *2

Page No. Part No. Part name *1

3, 5, 7, 9, 11 2 BH50R353H02 PRESSURE RELIEF VALVE 3bar 15 ± 1

7 12 BH50R377H01 DRAIN COCK 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 below. Always replace used O

ring or gasket.

Size

[inch]

Recommended tightening torque

[Nm]

Gasket

1/4" 8 ± 1N

3/8" 15 ± 1N

1" 42 ± 2N

1 1/2" 42 ± 2N

O-ring

Strainer cover 45 ± 4.5

Flow switch 8 ± 1N

Air vent (Automatic) 15 ± 1N

After the procedure is complete, ensure that no water leaks.

Page 63

SUPPLEMENTARY INFORMATION

Refrigerant recovery (pump down) for split systems only

For split system the following procedures should be followed to recover system refrigerant:

Note) Pump down operation can not be activated by switching the pump down switch (SWP) or test run switch on the outdoor unit PCB.

Ensure both the outdoor unit and the indoor unit are in emergency mode before carrying out the following. For pump down operation in split systems both the indoor and the outdoor unit must be in emergency mode. Please see the following instructions on how to activate emergency mode. Before carrying out the pump down, ensure the water pump is functioning correctly and L9 error code is not displayed on the main controller. If there is insufﬁ cient water circulation, the circuit may freeze causing damage to the plate HEX. If there is a fault with the pump or L9 error code is displayed on the main controller, do not attempt pump down operation. In this case a refrigerant recovery machine must be used.

1. Isolate outdoor unit from power supply by switching OFF relevant circuit breaker. If the indoor unit is powered independently to the outdoor unit, ensure that BOTH units are isolated from the power supply.

2. Fully close the stop valve on the refrigerant (liquid) pipe and attach the pressure gauge to the port on the low pressure side of the compressor refrigerant pipe work. Change the position of the connector CN31 to ON and change DipSW4-2 to OFF on the outdoor unit PCB. Change the DipSW4-5 on the indoor unit to ON.

3. Switch ON power to the outdoor unit. If the indoor unit is powered independently, switch on power to the indoor unit FIRST, then switch on power to the outdoor unit. Outdoor and indoor unit will start operating in emergency mode.

Note) If the outdoor unit is operated whilst the indoor unit is switched off, this could cause SERIOUS DAMAGE to the plate HEX.

Always ensure the indoor unit power supply is ON and water pump is operating before switching ON power to the outdoor unit. After reconnecting power supply, ensure the water pump is operating correctly. If the water pump is not operating normally, then this could cause the water circuit to freeze and DAMAGE the plate HEX.

4. When the pressure gauge reads close to 0MPa (G), close the valve on the refrigerant (gas) pipe and then switch power to outdoor unit OFF. If the indoor unit is powered independently ensure power supply for unit is OFF.

Note) It is important that after closing the valve on the refrigerant (gas) pipe the power supply is QUICKLY switched OFF.

If the system is running at a pressure of 0MPa (G) or lower, it may cause DAMAGE to the compressor.

5. After completing the pump down operation, return the position of the connector CN31 on the outdoor unit PCB to OFF.

Change the Dip SW4-5 on the indoor unit to OFF.

Page 64

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.

Engineers Forms

Should settings be changed from default, please enter 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

Parameters

Default setting

Field setting

Notes

Main Option Forced DHW operation *2 On/Off Off

DHW *2 On/Off/Timer Off Heating On/Off/Timer On Holiday mode Active/Non active/Set time Non active

Setting DHW *2 Operation mode Normal/Eco Normal

DHW max. temp 40°C – 60°C 50°C DHW temperature 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 *2 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 temperature 1 – 120 mins 30 min

Heating Operation mode Heating Flow temp/Compensation curve/Room temp Room temp

Heating room temp 10°C – 30°C 20°C

Heating ﬂ ow temp 25°C – 60°C 45°C Compensation curve

Lo set point Outdoor ambient temp -15°C – 35°C 35°C

Flow temp 25°C – 60°C 25°C

Hi set point Outdoor ambient temp -15°C – 35°C -15°C

Flow Temp 25°C – 60°C 50°C

Adjust Outdoor Ambient Temp -14°C – 34°C —

Flow temp 25°C – 60°C — Schedule timer Active Yes/No No Holiday DHW *2 Active/Non active Non active

Heating Active/Non active Active

Heating room temp 10°C – 30°C 15°C

Heating ﬂ ow temp 25°C – 60°C 35°C Initial settings Language ENG/PT/NOR/FIN/NL/DA/IT/SP/SW/GER/FR ENG

°C/°F °C/°F °C

Temp display On/Off Off

Time display hh:mm/hh:mm AM/AM hh:mm —

Room sensor setting TH1/Main RC/Room RC1-8/(Time/Zone) TH1 Service menu Manual operation Supplementary pump or 3 way valve On/Off Off

Thermistor adjustment -10°C — +10°C 0°C

Auxiliary setting Economy setting

for pump

Active/Not active Active Time before pump switched off (3 – 60 mins)*1

10 mins Freeze stat function

Outdoor ambient temperature (3 – 20°C) 5°C

Electric heater (Heating)

Space heating: Used/Not Used Used

Electric heater delay timer (5 – 180 mins) 30 mins Electric heater (DHW) *2

DHW: Used/Not Used Used

Electric heater delay timer (15 – 30 mins) 15 mins

Heat source setting Standard/Heater Standard Operation setting Simultaneous

operation

Active/Inactive Inactive

Outdoor ambient temperature (-15 – 10°C) -15°C Cold weather function

Active/Inactive Inactive

Outdoor ambient temperature (-15 – -10°C) -15°C Room temp control (Heating)

Temperature control interval (10 – 60 mins) 10 mins

Flow temperature range (Maximum temp.)

(35 – 60°C)

50°C

Flow temperature range (Minimum temp.)

(25 – 40°C)

30°C

*1 Decreasing “time before pump switched off” may increase the duration of stand-by in Heating mode. *2 Only available if DHW tank presents in system.

Page 65

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

Isolate and drain hydrobox, remove mesh from internal strainer clean and replace.

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.

Drop the primary/heating system pressure to zero check and if necessary top up the expansion vessel (1 bar). Air valve of expansion vessel is TR-412.

Check and if necessary top up the concentration of anti-freeze/inhibitor (if used in the system).

Top up the primary/heating system using an appropriate ﬁ lling loop and re-pressurise to 1 bar.

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 strainer. This is especially 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)

Pump 20,000 hrs (3 years) 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).

Page 66

HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN

New publication, effective Jul. 2011 Specifications subject to change without notice

Mitsubishi Electric EHSC-VM6A, EHPX-VM2A, EHSC-YM9A Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual