Mitsubishi Electric EHSC-MEC User manual

SERVICE MANUAL
CONTENTS
1. REFERENCE MANUAL................................... 3
2. SAFETY PRECAUTION................................... 4
3. SPECIFICATIONS............................................ 7
4. PART NAMES AND FUNCTIONS ................ 10
5. OUTLINES AND DIMENSIONS..................... 12
6. WIRING DIAGRAM........................................ 14
7. FIELD WIRING............................................... 30
8. WATER SYSTEM DIAGRAM......................... 32
9. CONTROLS ................................................... 35
10. TROUBLESHOOTING................................... 55
11. DISASSEMBLY PROCEDURE...................... 72
12. SUPPLEMENTARY INFORMATION ............. 93
13. SERVICE AND MAINTENANCE ................... 94
Notes:
• This manual describes ser-
vice data of Hydrobox only.
R410A
MAIN REMOTE
CONTROLLER
PARTS CATALOG (OCB571)
HYDROBOX
December 2018
HYDROBOX
No. OCH571
REVISED EDITION-D
OCH571 REVISED EDITION-C
is void.
Revision:
• Added
EHSC-MECR3.UK ,
EHSC-VM2CR3.UK,
EHSC-VM2ECR3.UK,
EHSC-VM6CR3.UK,
EHSC-VM6ECR3.UK,
EHSC-YM9CR3.UK,
EHSC-YM9ECR3.UK,
EHSC-TM9CR3.UK,
EHSD-MCR3.UK,
EHSD-MECR3.UK,
EHSD-VM2CR3.UK,
EHSD-YM9CR3.UK,
ERSC-MECR3.UK,
ERSC-VM2CR3.UK,
ERSD-VM2CR3.UK,
EHPX-VM2CR3.UK,
EHPX-VM6CR3.UK and
EHPX-YM9CR3.UK in
REVISED EDITION-D.
• Some descriptions have
been modified.
[Model Name]
EHSC-MEC
EHSC-VM2C
EHSC-VM2EC
EHSC-VM6C
EHSC-VM6EC
EHSC-YM9C
EHSC-YM9EC
EHSC-TM9C
EHSD-MC
EHSD-MEC
EHSD-VM2C
EHSD-YM9C
[Service Ref.]
Refer to page 2.
ERSC-MEC
ERSC-VM2C
ERSD-VM2C
EHPX-VM2C
EHPX-VM6C
EHPX-YM9C

2
EHSC-MECR1.UK
EHSC-VM2CR1.UK
EHSC-VM2ECR1.UK
EHSC-VM6CR1.UK
EHSC-VM6ECR1.UK
EHSC-YM9CR1.UK
EHSC-YM9ECR1.UK
EHSC-TM9CR1.UK
EHSD-MCR1.UK
EHSD-MECR1.UK
EHSD-VM2CR1.UK
EHSD-YM9CR1.UK
ERSC-MECR1.UK
ERSC-VM2CR1.UK
ERSD-VM2CR1.UK
EHPX-VM2CR1.UK
EHPX-VM6CR1.UK
EHPX-YM9CR1.UK
EHSC-MECR2.UK
EHSC-VM2CR2.UK
EHSC-VM2ECR2.UK
EHSC-VM6CR2.UK
EHSC-VM6ECR2.UK
EHSC-YM9CR2.UK
EHSC-YM9ECR2.UK
EHSC-TM9CR2.UK
EHSD-MCR2.UK
EHSD-MECR2.UK
EHSD-VM2CR2.UK
EHSD-YM9CR2.UK
ERSC-MECR2.UK
ERSC-VM2CR2.UK
ERSD-VM2CR2.UK
EHPX-VM2CR2.UK
EHPX-VM6CR2.UK
EHPX-YM9CR2.UK
[Service Ref.]
EHSC-MEC.UK
EHSC-VM2C.UK
EHSC-VM2EC.UK
EHSC-VM6C.UK
EHSC-VM6EC.UK
EHSC-YM9C.UK
EHSC-YM9EC.UK
EHSC-TM9C.UK
EHSD-MC.UK
EHSD-MEC.UK
EHSD-VM2C.UK
EHSD-YM9C.UK
ERSC-MEC.UK
ERSC-VM2C.UK
ERSD-VM2C.UK
EHPX-VM2C.UK
EHPX-VM6C.UK
EHPX-YM9C.UK
EHSC-MECR3.UK
EHSC-VM2CR3.UK
EHSC-VM2ECR3.UK
EHSC-VM6CR3.UK
EHSC-VM6ECR3.UK
EHSC-YM9CR3.UK
EHSC-YM9ECR3.UK
EHSC-TM9CR3.UK
EHSD-MCR3.UK
EHSD-MECR3.UK
EHSD-VM2CR3.UK
EHSD-YM9CR3.UK
ERSC-MECR3.UK
ERSC-VM2CR3.UK
ERSD-VM2CR3.UK
EHPX-VM2CR3.UK
EHPX-VM6CR3.UK
EHPX-YM9CR3.UK
OCH571D

3
REFERENCE MANUAL
1
OUTDOOR UNIT'S SERVICE MANUAL
Service Ref. Service Manual No.
PUHZ-W50/85VHA(-BS)
OCH439
PUHZ-W50/85VHAR1(-BS)
PUHZ-W50VHAR2(-BS)
PUHZ-W50VHAR3(-BS)
PUHZ-W50VHA2(-BS) OCH605
PUHZ-W50VHA2R1(-BS)
PUHZ-W85VHA2(-BS).UK
OCH465
PUHZ-W85VHA2R1(-BS).UK
PUHZ-W85VHA2R3(-BS).UK
PUHZ-W85VHA2R4(-BS).UK
PUHZ-W85VHA2R5(-BS).UK
PUHZ-W112VHA(-BS) OCH562
PUHZ-W112VHAR1(-BS)
PUHZ-HW112/140YHA(-BS)
OCH439
PUHZ-HW112/140YHA2(-BS)
PUHZ-HW112/140YHA2R1(-BS)
PUHZ-HW112/140YHA2R3(-BS)
PUHZ-HW112/140YHA2R4(-BS)
PUHZ-HW112/140YHA2R5(-BS)
PUHZ-HW140VHA(-BS)
PUHZ-HW140VHA2(-BS)
PUHZ-HW140VHA2R1(-BS)
PUHZ-HW140VHA2R2-BS
PUHZ-HW140VHA2R3(-BS)
PUHZ-HW140VHA2R4(-BS)
PUHZ-HW140VHA2R5(-BS)
PUHZ-SW40/50VHA(-BS)
OCH525PUHZ-SW40/50VHAR1(-BS)
PUHZ-SW50VKA(-BS)
PUHZ-SW75/100/120VHA(-BS).UK
OCH533
PUHZ-SW75/100/120VHAR3(-BS).UK
PUHZ-SW75/100/120VHAR4(-BS).UK
PUHZ-SW100/120YHA(-BS).UK
PUHZ-SW100/120YHAR1(-BS).UK
PUHZ-SW100/120YHAR3(-BS).UK
PUHZ-SW100/120YHAR4(-BS).UK
PUHZ-SHW80/112VHA
OCH526
PUHZ-SHW80/112VHAR2(-BS).UK
PUHZ-SHW80/112VHAR3(-BS).UK
PUHZ-SHW80/112VHAR4(-BS).UK
PUHZ-SHW112/140YHA(R1)
PUHZ-SHW112/140YHAR2(-BS).UK
PUHZ-SHW112/140YHAR3(-BS).UK
PUHZ-SHW112/140YHAR4(-BS).UK
PUHZ-FRP71VHA OCH544
SUHZ-SW45VA(H).TH
OCH557SUHZ-SW45VA(H)R1.TH
SUHZ-SW45VA(H)R2.TH
OCH571D

4
SAFETY PRECAUTION
2
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 modied after installation by the user, water leakage, electric shock or re may result.
The outdoor unit should be securely 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 lled weight to prevent excessive sound or vibration.
Do not position furniture or electrical appliances below the outdoor unit or hydrobox.
The discharge pipework from the emergency/safety devices of the hydrobox should be installed according to local law.
Only use accessories and replacement parts authorised by Mitsubishi Electric. Ask a qualied technician to t the parts.
Electrical
All electrical work should be performed by a quali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 conducted by a qualied person.
Do not place containers with liquids on top of the hydrobox. If they leak or spill onto the hydrobox damage to the unit and/or re could occur.
Do not place any heavy items on top of the hydrobox.
When installing, relocating, or servicing the hydrobox, use only the specied refrigerant (R410A) to charge the refrigerant lines. Do not mix it with any other re-
frigerant 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 specied for the system will cause mechanical failure or system malfunction or unit breakdown. In the worst case, this
could lead to a serious impediment to securing product safety.
In heating mode, to avoid the heat emitters being damaged by excessively hot water, set the target ow temperature to a minimum of 2ºC below the maximum
allowable temperature of all the heat emitters. For Zone2, set the target ow temperature to a minimum of 5ºC below the maximum allowable ow temperature
of all the heat emitters in Zone2 circuit.
Do not install the unit where combustible gases may leak, be produced, ow, or accumulate. If combustible gas accumulates around the unit, re or explosion
may result.
CAUTION
Use clean water that meets local quality standards on the primary circuit.
The outdoor unit should be installed in an area with sufcient air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 man-
ufacturer.
In order to prevent condensation on emitters, adjust ow temperature appropriately and also set the lower limit of the ow temperature on site.
As for the handling of refrigerant, refer to the outdoor unit installation manual.
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-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.
OCH571D

5
CAUTION (SPLIT MODELS ONLY *1)
<Using R410A refrigerant heat pumps>
Use C1220 copper phosphorus, for copper and copper alloy seamless pipes, to connect the refrigerant pipes. Make sure the insides of the pipes are clean and
do not contain any harmful contaminants such as sulfuric compounds, oxidants, debris, or dust. Use pipes with the specied thickness. Note the following if reus-
ing existing pipes that carried R22 refrigerant.
- Replace the existing are nuts and are the ared sections again.
- Do not use thin pipes.
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 packag-
ing.) 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 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 specically designed for use with R410A refrigerant. The following tools are necessary to use R410A refrigerant. Contact your nearest
dealer for any questions.
Tools (for R410A)
Gauge manifold Flare tool
Charge hose Size adjustment gauge
Gas leak detector Vacuum pump adapter
Torque wrench Electronic refrigerant charging scale
Be sure to use the correct tools. If dust, debris, or moisture enters the refrigerant lines, refrigeration oil deterioration may result.
Do not use a charging cylinder, a cylindrical measuring container, when charging R410A refrigerant gas. If the refrigerant gas is transferred to a charging cylinder,
the composition of the refrigerant will change and system efciency will be reduced.
WARNING (SPLIT MODELS ONLY *1)
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.
*1 Split model = EHSC/D or ERSC/D series
Packaged model = EHPX series
OCH571D

Unit
Electronic weighing scale
6
[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) If moisture or foreign matter might have entered the refrigerant piping during service, ensure to remove them.
[2] Additional refrigerant charge
When charging directly from refrigerant cylinder
(1) Check that cylinder for R410A on the market is syphon type.
(2) 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
1Gauge manifold
· Only for R410A
· Use the existing fitting specifications. (UNF1/2)
· Use high-tension side pressure of 5.3 MPa·G or over.
2Charge hose · Only for R410A
· Use pressure performance of 5.09 MPa·G or over.
3Electronic scale —
4Gas leak detector · Use the detector for R134a, R407C or R410A
5Adaptor for reverse flow check · Attach on vacuum pump.
6Refrigerant charge base —
7Refrigerant cylinder · Only for R410A · Top of cylinder (Pink)
· Cylinder with syphon
8Refrigerant recovery equipment —
OCH571D

7
SPECIFICATIONS
3
<Table 3-1>
Model name (Service Ref.) EHSD-
MEC.UK
EHSD-
MC.UK
EHSD-
VM2C.UK
EHSD-
YM9C.UK
EHSC-
MEC.UK
EHSC-
VM2C.UK
EHSC-
VM2EC.UK
EHSC-
VM6C.UK
EHSC-
VM6EC.UK
EHSC-
YM9C.UK
EHSC-
YM9EC.UK
EHSC-
TM9C.UK
ERSD-
VM2C.UK
ERSC-
MEC.UK
ERSC-
VM2C.UK
EHPX-
VM2C.UK
EHPX-
VM6C.UK
EHPX-
YM9C.UK
Overall unit dimensions 800 × 530 × 360 mm (Height × Width × Depth) Weight (empty) 38 kg 43 kg 44 kg 45 kg 42 kg 48 kg 43 kg 49 kg 44 kg 49 kg 44 kg 49 kg 45 kg 43 kg 49 kg 37 kg 38 kg 38 kg
Weight (full) 44 kg 49 kg 50 kg 51 kg 49 kg 55 kg 50 kg 56 kg 51 kg 56 kg 51 kg 56 kg 51 kg 50 kg 56 kg 42 kg 43 kg 43 kg
Water volume of heating circuit in the unit 5.2 kg 5.2 kg 5.2 kg 5.2 kg 6.1 kg 6.1 kg 6.1 kg 6.1 kg 6.1 kg 6.1 kg 6.1 kg 6.1 kg 5.5 kg 6.4 kg 6.4 kg 4.5 kg 4.5 kg 4.5 kg
Plate heat exchanger (MWA2) ———— — — — —
Plate heat exchanger (MWA1) ———————— —————
Cooling mode NOT available Available NOT available
Unvented expansion vessel(Primary heating)
Nominal volume — 10 L —10 L —10 L —10 L —10 L —10 L
Charge pressure — 1 bar — 1 bar — 1 bar — 1 bar — 1 bar — 1 bar
Safety device
Water circuit (Primary)
Control thermistor 1–80°C Pressure relief valve 0.3 MPa (3bar) Flow sensor Min ow 5.0 L/min
Booster heater
Manual reset thermostat — 90°C — 90°C — 90°C
Thermal Cut-out (for dry run prevention) — 121°C — 121°C — 121°C
Primary circuit circulating Pump Grundfos UPM2 15–70 130 Connections
Water 28 mm compression (primary circuit) G1 (Male) 28 mm compression
(primary circuit)
Refrigerant (R410A)
Liquid 6.35 mm 9.52 mm 6.35 mm 9.52 mm —
Gas 12.7 mm 15.88 mm 12.7 mm 15.88 mm —
Target temperature range
Flow temperature
Heating 25–60°C Cooling — 5–25°C —
Room temperature
Heating 10–30 °C Cooling — NOT available —
Guaranteed operat- ing range
Ambient *1 0–35°C ( 80%RH)
Outdoor temperature
Heating See outdoor unit spec table. Cooling —See outdoor unit spec table
(minimum 10°C). *2 —
Electrical data
Control board
Power supply (Phase, voltage, fre- quency)
~/N, 230 V, 50 Hz
Breaker (when powered from independent source)
10A
Booster heater
Power supply (Phase, voltage, fre- quency)
— —
~/N, 230 V,
50 Hz
3~, 400 V,
50 Hz —
~/N, 230 V,
50 Hz
~/N, 230 V,
50 Hz
~/N, 230 V,
50 Hz
~/N, 230 V,
50 Hz
3~, 400 V,
50 Hz
3~, 400 V,
50 Hz
3~, 230 V,
50 Hz
~/N, 230 V,
50 Hz
—
~/N, 230 V,
50 Hz
~/N, 230 V,
50 Hz
~/N, 230 V,
50 Hz
3~, 400 V,
50 Hz
Capacity — — 2 kW 3kW+
6 kW — 2 kW 2 kW 2 kW+
4 kW
2 kW+
4 kW
3kW+
6 kW
3kW+
6 kW
3kW+
6 kW 2 kW — 2 kW 2 kW 2 kW+
4 kW
3kW+
6 kW
Current — — 9 A 13 A —9 A 9 A 26 A 26 A 13 A 13 A 23 A 9 A —9 A 9 A 26 A 13 A
Breaker — — 16 A 16 A —16 A 16 A 32 A 32 A 16 A 16 A 32 A 16 A —16 A 16 A 32 A 16 A
Sound level 28 dB(A)
Optional extras
●Wireless Remote Controller PAR-WT50R-E ●
Tank thermistor (THW5) (30 m)
PAC-TH011TKL-E *1 The environment must be frost-free.
●Wireless Receiver PAR-WR51R-E ●Thermistor PAC-TH011-E *2 Cooling mode is not available in low outdoor temperature. ●Remote Sensor PAC-SE41TS-E ●High temperature thermistor PAC-TH011HT-E If you use our system in cooling mode at the low ambient temperature (10°C or below), there are some risks of plate heat exchanger breaking by frozen water. ●Tank thermistor (THW5) (5 m) PAC-TH011TK-E ●ecodan Wi-Fi Interface PAC-WF010-E
●2-zone kit PAC-TZ01-E
OCH571D

8
<Table 3-2>
Optional extras
●Wireless Remote Controller PAR-WT50R-E ●
Tank thermistor (THW5) (30 m)
PAC-TH011TKL-E *1 The environment must be frost-free.
●Wireless Receiver PAR-WR51R-E ●Thermistor PAC-TH011-E *2 Cooling mode is not available in low outdoor temperature. ●Remote Sensor PAC-SE41TS-E ●High temperature thermistor PAC-TH011HT-E If you use our system in cooling mode at the low ambient temperature (10°C or below), there are some risks of plate heat exchanger breaking by frozen water. ●Tank thermistor (THW5) (5 m) PAC-TH011TK-E ●ecodan Wi-Fi Interface PAC-WF010-E
●2-zone kit PAC-TZ01-E
Model name (Service Ref.)
EHSD-
MECR1.UK
EHSD-
MCR1.UK
EHSD-
VM2CR1.UK
EHSD-
YM9CR1.UK
EHSC-
MECR1.UK
EHSC-
VM2CR1.UK
EHSC-
VM2ECR1.UK
EHSC-
VM6CR1.UK
EHSC-
VM6ECR1.UK
EHSC-
YM9CR1.UK
EHSC-
YM9ECR1.UK
EHSC-
TM9CR1.UK
ERSD-
VM2CR1.UK
ERSC-
MECR1.UK
ERSC-
VM2CR1.UK
EHPX-
VM2CR1.UK
EHPX-
VM6CR1.UK
EHPX-
YM9CR1.UK
EHSD-
MECR2.UK
EHSD-
MCR2.UK
EHSD-
VM2CR2.UK
EHSD-
YM9CR2.UK
EHSC-
MECR2.UK
EHSC-
VM2CR2.UK
EHSC-
VM2ECR2.UK
EHSC-
VM6CR2.UK
EHSC-
VM6ECR2.UK
EHSC-
YM9CR2.UK
EHSC-
YM9ECR2.UK
EHSC-
TM9CR2.UK
ERSD-
VM2CR2.UK
ERSC-
MECR2.UK
ERSC-
VM2CR2.UK
EHPX-
VM2CR2.UK
EHPX-
VM6CR2.UK
EHPX-
YM9CR2.UK
Overall unit dimensions 800 × 530 × 360 mm (Height × Width × Depth) Weight (empty) 38 kg 43 kg 44 kg 45 kg 42 kg 48 kg 43 kg 49 kg 44 kg 49 kg 44 kg 49 kg 45 kg 43 kg 49 kg 37 kg 38 kg 38 kg
Weight (full) 44 kg 49 kg 50 kg 51 kg 49 kg 55 kg 50 kg 56 kg 51 kg 56 kg 51 kg 56 kg 51 kg 50 kg 56 kg 42 kg 43 kg 43 kg
Water volume of heating circuit in the unit 5.2 kg 5.2 kg 5.2 kg 5.2 kg 6.1 kg 6.1 kg 6.1 kg 6.1 kg 6.1 kg 6.1 kg 6.1 kg 6.1 kg 5.5 kg 6.4 kg 6.4 kg 4.5 kg 4.5 kg 4.5 kg
Plate heat exchanger (MWA2) ———— — — — —
Plate heat exchanger (MWA1) ———————— —————
Cooling mode NOT available Available NOT available
Unvented expansion vessel(Primary heating)
Nominal volume — 10 L —10 L —10 L —10 L —10 L —10 L
Charge pressure — 1 bar — 1 bar — 1 bar — 1 bar — 1 bar — 1 bar
Safety device
Water circuit (Primary)
Control thermistor 1–80°C Pressure relief valve (Red) 0.3 MPa (3bar) Flow sensor Min ow 5.0 L/min
Booster heater
Manual reset thermostat — 90°C — 90°C — 90°C
Thermal Cut-out (for dry run prevention) — 121°C — 121°C — 121°C
Primary circuit circulating Pump Grundfos UPM2 15–70 130 Grundfos UPM2K 15–75 130 Grundfos UPM2 15–70 130 Connections
Water 28 mm compression (primary circuit) G1 (Male) 28 mm compression
(primary circuit)
Refrigerant (R410A)
Liquid 6.35 mm 9.52 mm 6.35 mm 9.52 mm — Gas 12.7 mm 15.88 mm 12.7 mm 15.88 mm —
Target temperature range
Flow temperature
Heating 25–60°C Cooling — 5–25°C —
Room temperature
Heating 10–30 °C Cooling — NOT available —
Guaranteed operat- ing range
Ambient *1 0–35°C ( 80%RH)
Outdoor temperature
Heating See outdoor unit spec table. Cooling —See outdoor unit spec table
(minimum 10°C). *2 —
Electrical data
Control board
Power supply (Phase, voltage, frequency) ~/N, 230 V, 50 Hz Breaker (when pow- ered 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
~/N, 230 V,
50 Hz
~/N, 230 V,
50 Hz
~/N, 230 V,
50 Hz
3~, 400 V,
50 Hz
3~, 400 V,
50 Hz
3~, 230 V,
50 Hz
~/N, 230 V,
50 Hz
—
~/N, 230 V,
50 Hz
~/N, 230 V,
50 Hz
~/N, 230 V,
50 Hz
3~, 400 V,
50 Hz
Capacity — — 2 kW 3kW+
6 kW — 2 kW 2 kW 2 kW+
4 kW
2 kW+
4 kW
3kW+
6 kW
3kW+
6 kW
3kW+
6 kW 2 kW — 2 kW 2 kW 2 kW+
4 kW
3kW+
6 kW
Current — — 9 A 13 A —9 A 9 A 26 A 26 A 13 A 13 A 23 A 9 A —9 A 9 A 26 A 13 A
Breaker — — 16 A 16 A —16 A 16 A 32 A 32 A 16 A 16 A 32 A 16 A —16 A 16 A 32 A 16 A
Sound pressure level 28 dB(A) Sound power level 40 dB(A)
OCH571D

9
<Table 3-3>
Optional extras
●Wireless Remote Controller PAR-WT50R-E ●
Tank thermistor (THW5) (30 m)
PAC-TH011TKL-E *1 The environment must be frost-free.
●Wireless Receiver PAR-WR51R-E ●Thermistor PAC-TH011-E *2 Cooling mode is not available in low outdoor temperature. ●Remote Sensor PAC-SE41TS-E ●High temperature thermistor PAC-TH011HT-E If you use our system in cooling mode at the low ambient temperature (10°C or below), there are some risks of plate heat exchanger breaking by frozen water. ●Tank thermistor (THW5) (5 m) PAC-TH011TK-E ●ecodan Wi-Fi Interface PAC-WF010-E
●2-zone kit PAC-TZ01-E
Model name (Service Ref.) EHSD-
MECR3.UK
EHSD-
MCR3.UK
EHSD-
VM2CR3.UK
EHSD-
YM9CR3.UK
EHSC-
MECR3.UK
EHSC-
VM2CR3.UK
EHSC-
VM2ECR3.UK
EHSC-
VM6CR3.UK
EHSC-
VM6ECR3.UK
EHSC-
YM9CR3.UK
EHSC-
YM9ECR3.UK
EHSC-
TM9CR3.UK
ERSD-
VM2CR3.UK
ERSC-
MECR3.UK
ERSC-
VM2CR3.UK
EHPX-
VM2CR3.UK
EHPX-
VM6CR3.UK
EHPX-
YM9CR3.UK
Overall unit dimensions 800 × 530 × 360 mm (Height × Width × Depth) Weight (empty) 38 kg 43 kg 44 kg 45 kg 42 kg 48 kg 43 kg 49 kg 44 kg 49 kg 44 kg 49 kg 45 kg 43 kg 49 kg 37 kg 38 kg 38 kg
Weight (full) 44 kg 49 kg 50 kg 51 kg 49 kg 55 kg 50 kg 56 kg 51 kg 56 kg 51 kg 56 kg 51 kg 50 kg 56 kg 42 kg 43 kg 43 kg
Water volume of heating circuit in the unit 5.2 kg 5.2 kg 5.2 kg 5.2 kg 6.1 kg 6.1 kg 6.1 kg 6.1 kg 6.1 kg 6.1 kg 6.1 kg 6.1 kg 5.5 kg 6.4 kg 6.4 kg 4.5 kg 4.5 kg 4.5 kg
Plate heat exchanger (MWA2) ———— — — — —
Plate heat exchanger (MWA1) ———————— —————
Cooling mode NOT available Available NOT available
Unvented expansion vessel(Primary heating)
Nominal volume — 10 L —10 L —10 L —10 L —10 L —10 L
Charge pressure — 1 bar — 1 bar — 1 bar — 1 bar — 1 bar — 1 bar
Safety device
Water circuit (Primary)
Control thermistor 1–80°C Pressure relief valve (Red) 0.3 MPa (3bar) Pressure relief valve (Black) — 0.5 MPa (5bar) — 0.5 MPa
(5bar) —0.5 MPa
(5bar) —0.5 MPa
(5bar) — 0.5 MPa (5bar) — 0.5 MPa (5bar)
Flow sensor Min ow 5.0 L/min
Booster heater
Manual reset thermostat — 90°C — 90°C — 90°C
Thermal Cut-out (for dry run prevention) — 121°C — 121°C — 121°C
Primary circuit circulating Pump Grundfos UPM2 15–70 130 Grundfos UPM2K 15–75 130 Grundfos UPM2 15–70 130 Connections
Water 28 mm compression (primary circuit) G1 (Male) 28 mm compression
(primary circuit)
Refrigerant (R410A)
Liquid 6.35 mm 9.52 mm 6.35 mm 9.52 mm — Gas 12.7 mm 15.88 mm 12.7 mm 15.88 mm —
Target temperature range
Flow temperature
Heating 25–60°C Cooling — 5–25°C —
Room temperature
Heating 10–30 °C Cooling — NOT available —
Guaranteed operat- ing range
Ambient *1 0–35°C ( 80%RH)
Outdoor temperature
Heating See outdoor unit spec table. Cooling —See outdoor unit spec table
(minimum 10°C). *2 —
Electrical data
Control board
Power supply (Phase, voltage, frequency) ~/N, 230 V, 50 Hz Breaker (when pow- ered 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
~/N, 230 V,
50 Hz
~/N, 230 V,
50 Hz
~/N, 230 V,
50 Hz
3~, 400 V,
50 Hz
3~, 400 V,
50 Hz
3~, 230 V,
50 Hz
~/N, 230 V,
50 Hz
—
~/N, 230 V,
50 Hz
~/N, 230 V,
50 Hz
~/N, 230 V,
50 Hz
3~, 400 V,
50 Hz
Capacity — — 2 kW 3kW+
6 kW — 2 kW 2 kW 2 kW+
4 kW
2 kW+
4 kW
3kW+
6 kW
3kW+
6 kW
3kW+
6 kW 2 kW — 2 kW 2 kW 2 kW+
4 kW
3kW+
6 kW
Current — — 9 A 13 A —9 A 9 A 26 A 26 A 13 A 13 A 23 A 9 A —9 A 9 A 26 A 13 A
Breaker — — 16 A 16 A —16 A 16 A 32 A 32 A 16 A 16 A 32 A 16 A —16 A 16 A 32 A 16 A
Sound pressure level 28 dB(A) Sound power level 40 dB(A)
OCH571D

10
PART NAMES AND FUNCTIONS
4
1
2
9
11
7
8
10
8
7
10
13
12
3
4
5
13
14
5
4
6
6
<E*S*-*M**C(R1)> (Split model system)
<EHPX-*M*C(R1)> (Packaged model system)
No. Part name EHS*-MEC(R1) EHS*-*M*C(R1) EHSC-*M*EC(R1) ERS*-VM2C(R1) ERSC-MEC(R1) EHPX-*M*C(R1)
1 Control and electrical box
2 Main remote controller
3Plate heat exchanger
(Refrigerant - Water)
-
4 Water circulation pump 1
5 Pump valve
6 Drain cock (Primary circuit)
7 Booster heater 1,2 - -
8Flow sensor
9 Manometer
10 Pressure relief valve (3bar)
11 Automatic air vent
12 Expansion vessel ---
13 Strainer valve
14 Drain pan - - - -
<Table 4-1>
<Figure 4-1> <Figure 4-2>
<Figure 4-3>
OCH571D

11
<Figure 3.3>用
1
2
9
11
7
8
10
8
7
10
13
12
3
4
5
13
14
5
4
6
6
<E*S*-*M**C R2/R3> (Split model system)
<EHPX-*M*C R2/R3> (Packaged model system)
No. Part name EHS*-MEC
R2/R3 EHS*-*M*CR2 EHS*-*M*CR3 EHSC-*M*EC R2/R3 ERS*-VM2CR2 ERS*-VM2CR3 ERSC-MEC R2/R3 EHPX-*M*CR2 EHPX-*M*CR3
1 Control and electrical box
2 Main remote controller
3Plate heat exchanger
(Refrigerant - Water)
- -
4 Water circulation pump 1
5 Pump valve
6 Drain cock (Primary circuit)
7 Booster heater 1,2 - -
8Flow sensor
9 Manometer
10 Pressure relief valve (3bar)
11 Automatic air vent
12 Expansion vessel ---
13 Strainer valve
14 Drain pan ---- --
15 Pressure relief valve (5bar) - - - - - -
<Table 4-2>
<Figure 4-4> <Figure 4-5>
<Figure 4-6>
15
OCH571D

12
OUTLINES AND DIMENSIONS
5
(
348)
357
291
263
242
103
461
419
334
163
124
86
78
48
242
(348)
357
291
263
134
94
133
365
308
163 223
124
461
86
48
100±5
592
800
260
530
B
H
H
A
HG
F
E
BA
B
I
C D
G
A G
C
(348)
461
410
395
353
310
163
124
86
48
291
263
357
242
164
58
(242)
110
D
Unit: mm
<EHS*> (Split model system)
<Front>
Automatic air vent
Front panel
Earth leakage circuit
breaker
Terminal block
Main remote controller
Pressure relief
valve (3bar)
G1/2
Back panel
support
Hook
<View from below>
<View from below>
<View from below>
<Side> <Rear>
<ERS*> (Split model system for heating and cooling)
<EHPX> (Packaged model system)
Letter Pipe description Connection size/type
A
Space heating/Indirect
DHW tank (primary) return
connection
28 mm/Compression (EHS*-*and EHPX-*)
G1 nut (ERS*-*)
B
Space heating/Indirect
DHW tank (primary) ow
connection
28 mm/Compression (EHS*-*and EHPX-*)
G1 nut (ERS*-*)
CRefrigerant (Liquid) 6.35 mm/Flare (E*SD-*)
9.52 mm/Flare (E*SC-*)
DRefrigerant (Gas) 12.7 mm/Flare (E*SD-*)
15.88 mm/Flare (E*SC-*)
EFlow connection from heat
pump 28 mm/Compression (EHPX-*)
F
Return connection to heat
pump
28 mm/Compression (EHPX-*)
G
Discharge pipe (by install-
er) from pressure relief
valve
G1/2” female (valve port within hydrobox
casing)
H
Electrical cable inlets
For inlets and , run high-voltage wires
including power cable, indoor-outdoor
cable, and external output wires.
For inlets and , run low-voltage
wires including external input wires and
thermistor wires.
For a wireless receiver (option) cable,
use inlet .
I Drain socket O.D. ø20
<Table 5-1>
5-1. Technical Drawings
OCH571D

a
bb
d
c
13
Service access
5-2. Service access diagrams
Service access
Parameter Dimension (mm)
a 200
b 150
c 500
d 500
Suf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.
OCH571D

NL S3S2S1
NL S3S2S1
To outdoor
unit
TB1
ORN ORN
YLW
YLW
GRN/YLW
To outdoor
unit
Power supply
~/N 230V 50Hz
TB1
ORN
BLU
RED
BLU
RED
YLW
GRN/YLW
1
3
CN3C
(BLU)
BLK BLK
BLK
BLK
1
3
ORN
BRN CN3C
(BLU) ORN
ORN
BRN
YLW
Indoor unit powered
by independent source
Indoor unit powered
via outdoor unit
CIRCUIT BREAKER
1
3
CN3C
(BLU)
1
3
CNPWM
(WHT)
LED1
LED2
LED3
LED4
TBI.1
1310 12 141174 65 932 81
TBI.2
1310 12 141174 65 932 81
t ° t °
THW8 THW7 THW6
t °
THW9
t °
THWB1
t °
THWB2
t °
Main
controller
1 2
12
CN20
(RED)
TH1
t °
13
CN21
(YLW)
TH2
t °
14
THW1 THW2
CNW12
(RED)
t ° t °
2
1
THW5 CNW5
(WHT)
t °
CN108
5
1
Wireless receiver
(Option)
WiFi adapter
(Option)
5
1
5
1
CNRF
(WHT)
CN105
(RED)
CN22
(BLU)
1
2
3
4
5
6
1
*1
5
Close
Open
N
X15
X12
TBO.4
TBO.3
TBO.2
TBO.1
F1
F2
M
2WV2a
MXV
MP2
MP1
M
1 ~
1
3
CNV1
(WHT)
1
3CNBHT
(BLK)
X11
X9
X8
X13
X10
X4
X14
X3
X2
X1
X5B
X5A
1
2
3
4
5
6
7
8
1
2
3
4
5
6
1
2
3
4
5
6
1
1
3
3
3
CNP1
(WHT)
CNPWM
(WHT)
TBO.1
TBO.2
TBO.3
TBO.4
CNP1
(WHT)
CNP4
(RED)
CNV1
(WHT)
CN22
(BLU)
CNIT
(BLU)
TAB1
CN01
(WHT)
F2 F1
6.3A 250V 10A 250V
SW1
SW2
SW3
SW4
SW5
1
8
1
8
1
1
5
1
3
1
3
8
1
1
2
3
4
5
6
1
2
3
4
5
6
1
2
3
4
5
6
7
8
1
2
3
4
5
6
8
1
6
CN01
(WHT)
CN01
(WHT) CN01
(WHT)
2
1
4
6
2
1
1
2
4
6
4
6
CNBH
(WHT)
CNBC
(GRY)
1
1
3
1
2
1
2
1
2
CNBHT
(BLK)
1
3
1
3
7
CNIH
(ORN)
1
4
1
3
CNW5
(WHT)
CN21
(YLW)
CNW12
(RED)
CN20
(RED)
TBI.2
126 10
14
8
137 119
4
53
2
1
6
4
2
1
CNIH
(ORN)
MP3
M
1 ~
IN8 IN9
IN10
1310 12 141174 65 932 81
TBI.3
TBI.3
2 4 6 8 10 12 14
1357 9 11 13
1
4
CN1A
(WHT)
2 4 6 8 10 12 14
1357 9 11 13
TBI.1
2WV2b
M
1 ~
TBO.2
3WV
*1
3WV
M
1
~
4 5 6 TBO.2
2WV1
2WV1
M
1
~
4 5 6
M
1 ~
IN6 IN1 IN2 IN3 IN4 IN5 IN7
CNP4
(RED)
MP4
M
1 ~
M
1 ~
1
3
Signal output
(Boiler)
Signal output
(Error)
Signal output
(Defrost)
Signal output
(Comp ON)
Signal output
(Cooling)
–
+– +– +
Tool
Tool
Conductor Conductor
Outline view Top view
<How to use TBO.1 to 4>
Connect them using either way as shown below.
1
3
5
7
X6
X7
1
3
CNBC
(GRY)
CNBH
(WHT)
14
6WIRING DIAGRAM
6-1. EHSC-MEC.UK, EHSD-MEC.UK, EHSD-MC.UK, ERSC-MEC.UK
1. Symbols used in wiring diagram are,
: connector, : terminal block.
2. Indoor unit and outdoor unit connecting wires
have polarities, make sure to match terminal
numbers (S1, S2, S3) for correct wirings,
3. Since the outdoor unit side electric wiring may
change, be sure to check the outdoor unit electric
wiring diagram for service.
Table 1 Signal Inputs
Name Terminal block Connector Item OFF (Open) ON (Short)
IN1 TBI.1 13-14 — Room thermostat 1 input Refer to SW2-1 in <6-16. DIP switch functions>.
IN2 TBI.1 11-12 — Flow switch 1 input Refer to SW2-2 in <6-16. DIP switch functions>.
IN3 TBI.1 9-10 — Flow switch 2 input (Zone1) Refer to SW3-2 in <6-16. DIP switch functions>.
IN4 TBI.1 7-8 — Demand control input Normal Heat source OFF/ Boiler operation *2
IN5 TBI.1 5-6 — Outdoor thermostat input *1 Standard operation Heater operation/ Boiler operation *2
IN6 TBI.1 3-4 — Room thermostat 2 input Refer to SW3-1 in <6-16. DIP switch functions>.
IN7 TBI.1 1-2 — Flow switch 3 input (Zone2) Refer to SW3-3 in <6-16. DIP switch functions>.
IN8 TBI.3 1-2 — Electric energy meter 1
Refer to installation manual.IN9 TBI.3 3-4 — Electric energy meter 2
IN10 TBI.3 5-6 — Heat meter
*1. If using outdoor thermostat for controlling operation of heaters, the lifetime of the heaters and related parts may be
reduced.
*2. To turn on the boiler operation, use the main remote controller to select “Boiler” in “External input setting“ screen
in the service menu.
Table 2 Outputs
Name Terminal block Connector Item OFF ON
OUT1 TBO.1 1-2 CNP1 Water circulation pump 1 output (Space heating/cooling & DHW) OFF ON
OUT2 TBO.1 3-4 — Water circulation pump 2 output (Space heating/cooling for Zone1) OFF ON
OUT3 TBO.1 5-6 — Water circulation pump 3 output (Space heating/cooling for Zone2) *1 OFF ON
2-way valve 2b output *2
OUT4 TBO.2 4-6 CNV1 3-way valve (2-way valve) output Heating DHW
OUT5
TBO.2 1-2 —Mixing valve output *1 Stop Close
TBO.2 2-3 Open
OUT6 — CNBH 1-3 Booster heater 1 output OFF ON
OUT7 — CNBH 5-7 Booster heater 2 output OFF ON
OUT8 TBO.4 5-6 — Cooling signal output OFF ON
OUT9 TBO.4 3-4 CNIH Immersion heater output OFF ON
OUT10 TBO.3 1-2 — Boiler output OFF ON
OUT11 TBO.3 3-4 — Error output Normal Error
OUT12 TBO.3 5-6 — Defrost output Normal Defrost
OUT13 TBO.4 1-2 — 2-way valve 2a output *2 OFF ON
OUT14 — CNP4 Water circulation pump 4 output (DHW) OFF ON
OUT15 TBO.3 7-8 — Comp. ON signal OFF ON
Do not connect to the terminals that are indicated as “—” in the “Terminal block” eld.
*1. For 2-zone temperature control.
*2. For 2-zone valve ON/OFF control.
Symbol Name
TB1 Terminal block <Power supply, Outdoor unit>
MP1
Water circulation pump 1 (Space heating/cooling & DHW)
MP2 Water circulation pump 2
(Space heating/cooling for Zone1)(Local supply)
MP3 Water circulation pump 3
(Space heating/cooling for Zone2)(Local supply)
MP4 Water circulation pump 4 (DHW)(Local supply)
3WV(2WV1) 3-way valve (2-way valve 1)(Local supply)
2WV2a 2-way valve (For Zone1)(Local supply)
2WV2b 2-way valve (For Zone2)(Local supply)
MXV Mixing valve (Local supply)
TH1 Thermistor (Room temp.)(Option)
TH2 Thermistor (Ref. liquid temp.)
THW1 Thermistor (Flow water temp.)
THW2 Thermistor (Return water temp.)
THW5 Thermistor (DHW tank water temp.)(Option)
THW6 Thermistor (Zone1 ow temp.)(Option)
THW7 Thermistor (Zone1 return temp.)(Option)
THW8 Thermistor (Zone2 ow temp.)(Option)
THW9 Thermistor (Zone2 return temp.)(Option)
THWB1 Thermistor (Boiler ow temp.)(Option)
THWB2 Thermistor (Boiler return temp.)(Option)
IN1 Room thermostat 1 (Local supply)
IN2 Flow switch 1 (Local supply)
IN3 Flow switch 2 (Local supply)
IN4 Demand control (Local supply)
IN5 Outdoor thermostat (Local supply)
IN6 Room thermostat 2 (Local supply)
IN7 Flow switch 3 (Local supply)
IN8 Electric energy meter 1 (Local supply)
IN9 Electric energy meter 2 (Local supply)
IN10 Heat meter (Local supply)
FLOW TEMP. CONTROLLER (FTC5)
TBO.1−4 Terminal block <Outputs>
TBI.1
− 3Terminal block <Signal Inputs, Thermistor>
F1 Fuse (T10AL250V)
F2 Fuse (T6.3AL250V)
SW1
− 5DIP switch *See <6-16. DIP switch functions>.
X1
− 15 Relay
LED1 Power supply (FTC5)
LED2 Power supply (Main remote controller)
LED3 Communication (FTC5-Outdoor unit)
LED4 Reading or writing data to SD card
CNPWM Pump speed control signal for MP1
CN108 SD card connector
OCH571D

15
6-2. EHSC-MECR1.UK, EHSD-MECR1.UK, EHSD-MCR1.UK, ERSC-MECR1.UK
NL S3S2S1
NL S3S2S1
To outdoor
unit
TB1
OG OG
YE
YE
GNYE
To outdoor
unit
Power supply
~/N 230V 50Hz
TB1
OG
BU
RD
BU
RD
YE
GNYE
1
3
CN3C
(BU)
BK BK
BK
BK
1
3
OG
BN CN3C
(BU) OG
OG
BN
YE
Indoor unit powered
by independent source
Indoor unit powered
via outdoor unit
CIRCUIT BREAKER
1
3
CN3C
(BU)
1
3
CNPWM
(WH)
LED1
LED2
LED3
LED4
TBI.1
1310 12 141174 65 932 81
TBI.2
1310 12 141174 65 932 81
t ° t °
THW8 THW7 THW6
t °
THW9
t °
THWB1
t °
THWB2
t °
Main remote
controller
1 2
12
CN20
(RD)
TH1
t °
13
CN21
(YE)
TH2
t °
14
THW1 THW2
CNW12
(RD)
t ° t °
2
1
THW5 CNW5
(WH)
t °
CN108
5
1
Wireless receiver
(Option)
WiFi adapter
(Option)
5
1
5
1
CNRF
(WH)
CN105
(RD)
CN22
(BU)
1
2
3
4
5
6
Close
Open
N
X15
X12
TBO.4
TBO.3
TBO.2
TBO.1
F1
F2
M
2WV2a
MXV
MP2
MP1
M
1 ~
1
3
1
3CNBHT
(BK)
X11
X9
X8
X13
X10
X4
X14
X3
X2
X1
X5B
X5A
1
2
3
4
5
6
7
8
1
2
3
4
5
6
1
2
3
4
5
6
1
1
3
3
3
CNP1
(WH)
CNPWM
(WH)
TBO.1
TBO.2
TBO.3
TBO.4
CNP1
(WH)
CNP4
(RD)
CN22
(BU)
CNIT
(BU)
TAB1
CN01
(WH)
F2 F1
IEC T6.3AL250V IEC T10AL250V
SW1
SW2
SW3
SW4
SW5
1
8
1
8
1
1
3
1
3
8
1
1
2
3
4
5
6
1
2
3
4
5
6
1
2
3
4
5
6
7
8
1
2
3
4
5
6
8
1
6
CN01
(WH)
CN01
(WH) CN01
(WH)
2
1
4
6
2
1
1
2
4
6
4
6
CNBH
(WH)
CNBC
(GY)
1
1
3
1
2
1
2
1
2
CNBHT
(BK)
1
3
1
3
7
CNIH
(OG)
1
4
1
3
CNW5
(WH)
CN21
(YE)
CNW12
(RD)
CN20
(RD)
TBI.2
126 10
14
8
137 119
4
53
2
1
6
4
2
1
CNIH
(OG)
MP3
M
1 ~
IN8 IN9
IN10
1310 12 141174 65 932 81
TBI.3
TBI.3
2 4 6 8 10 12 14
1357 9 11 13
1
4
CN1A
(WH)
2 4 6 8 10 12 14
1357 9 11 13
TBI.1
2WV2b
M
1 ~
TBO.2
3WV
*1
3WV
M
1
~
4 5 6 TBO.2
2WV1
2WV1
M
1
~
4 5 6
M
1 ~
IN6 IN1 IN2 IN3 IN4 IN5 IN7
CNP4
(RD)
MP4
M
1 ~
M
1 ~
1
3
Signal output
(Boiler)
Signal output
(Error)
Signal output
(Defrost)
Signal output
(Comp. ON)
Signal output
(Cooling)
–
+– +– +
CNV1
(WH)
1
5
3
Tool
Tool
Conductor Conductor
Outline view Top view
<How to use TBO.1 to 4>
Connect them using either way as shown below.
1
3
5
7
X6
X7
1
3
CNBC
(GY)
CNBH
(WH)
1
*1 5
3
CNV1
(WH)
Flow
Sensor
14
CN1A
(WH)
1. Symbols used in wiring diagram are, :
connector, : terminal block.
2. Indoor unit and outdoor unit connecting wires have
polarities, make sure to match terminal numbers
(S1, S2, S3) for correct wirings.
3. Since the outdoor unit side electric wiring may
change, be sure to check the outdoor unit electric
wiring diagram for service.
Table 1 Signal Inputs
Name Terminal block Connector Item OFF (Open) ON (Short)
IN1 TBI.1 13-14 — Room thermostat 1 input Refer to SW2-1 in
<6-16. DIP switch functions>.
IN2 TBI.1 11-12 — Flow switch 1 input Refer to SW2-2 in
<6-16. DIP switch functions>.
IN3 TBI.1 9-10 — Flow switch 2 input (Zone1) Refer to SW3-2 in
<6-16. DIP switch functions>.
IN4 TBI.1 7-8 — Demand control input Normal Heat source OFF/
Boiler operation *2
IN5 TBI.1 5-6 — Outdoor thermostat input *1 Standard opera-
tion
Heater operation/
Boiler operation *2
IN6 TBI.1 3-4 — Room thermostat 2 input Refer to SW3-1 in
<6-16. DIP switch functions>.
IN7 TBI.1 1-2 — Flow switch 3 input (Zone2) Refer to SW3-3 in
<6-16. DIP switch functions>.
IN8 TBI.3 1-2 — Electric energy meter 1
Refer to installation manual.
IN9 TBI.3 3-4 — Electric energy meter 2
IN10 TBI.3 5-6 — Heat meter
IN1A TBI.3 12-14 CN1A Flow sensor
*1. If using outdoor thermostat for controlling operation of heaters, the lifetime of the
heaters and related parts may be reduced.
*2. To turn on the boiler operation, use the main remote controller to select “Boiler” in
“External input setting” screen in the service menu.
Table 2 Outputs
Name Terminal block Connector Item OFF ON
OUT1 TBO.1 1-2 CNP1 Water circulation pump 1 output (Space heat-
ing/cooling & DHW) OFF ON
OUT2 TBO.1 3-4 — Water circulation pump 2 output (Space heat-
ing/cooling for Zone1) OFF ON
OUT3 TBO.1 5-6 —
Water circulation pump 3 output (Space heat-
ing/cooling for Zone2) *1 OFF ON
2-way valve 2b output *2
OUT4 TBO.2 4-6 CNV1 3-way valve (2-way valve) output Heating DHW
OUT5
TBO.2 1-2 —Mixing valve output *1 Stop Close
TBO.2 2-3 Open
OUT6 — CNBH 1-3 Booster heater 1 output OFF ON
OUT7 — CNBH 5-7 Booster heater 2 output OFF ON
OUT8 TBO.4 5-6 — Cooling signal output OFF ON
OUT9 TBO.4 3-4 CNIH Immersion heater output OFF ON
OUT10 TBO.3 1-2 — Boiler output OFF ON
OUT11 TBO.3 3-4 — Error output Normal Error
OUT12 TBO.3 5-6 — Defrost output Normal Defrost
OUT13 TBO.4 1-2 — 2-way valve 2a output *2 OFF ON
OUT14 — CNP4 Water circulation pump 4 output (DHW) OFF ON
OUT15 TBO.3 7-8 — Comp. ON signal OFF ON
Do not connect to the terminals that are indicated as “—” in the “Terminal block” eld.
*1. For 2-zone temperature control.
*2. For 2-zone valve ON/OFF control.
Symbol Name
TB1 Terminal block <Power supply, Outdoor unit>
MP1 Water circulation pump 1
(Space heating/cooling & DHW)
MP2 Water circulation pump 2
(Space heating/cooling for Zone1)(Local supply)
MP3 Water circulation pump 3
(Space heating/cooling for Zone2)(Local supply)
MP4 Water circulation pump 4 (DHW)(Local supply)
3WV(2WV1) 3-way valve (2-way valve 1)(Local supply)
2WV2a 2-way valve (For Zone 1)(Local supply)
2WV2b 2-way valve (For Zone 2)(Local supply)
MXV Mixing valve (Local supply)
TH1 Thermistor (Room temp.)(Option)
TH2 Thermistor (Ref. liquid temp.)
THW1 Thermistor (Flow water temp.)
THW2 Thermistor (Return water temp.)
THW5 Thermistor (DHW tank water temp.)(Option)
Symbol Name
THW6 Thermistor (Zone1 ow temp.)(Option)
THW7 Thermistor (Zone1 return temp.)(Option)
THW8 Thermistor (Zone2 ow temp.)(Option)
THW9 Thermistor (Zone2 return temp.)(Option)
THWB1 Thermistor (Boiler ow temp.)(Option)
THWB2 Thermistor (Boiler return temp.)(Option)
IN1 Room thermostat 1 (Local supply)
IN2 Flow switch 1 (Local supply)
IN3 Flow switch 2 (Local supply)
IN4 Demand control (Local supply)
IN5 Outdoor thermostat (Local supply)
IN6 Room thermostat 2 (Local supply)
IN7 Flow switch 3 (Local supply)
IN8 Electric energy meter 1 (Local supply)
IN9 Electric energy meter 2 (Local supply)
IN10 Heat meter (Local supply)
Symbol Name
IN1A Flow sensor
FLOW TEMP. CONTROLLER (FTC5)
TBO.1−4 Terminal block <Outputs>
TBI.1
− 3Terminal block <Signal Inputs, Thermistor>
F1 Fuse (IEC T10AL250V)
F2 Fuse (IEC T6.3AL250V)
SW1
− 5DIP switch *See <6-16. DIP switch functions>.
X1
− 15 Relay
LED1 Power supply (FTC5)
LED2 Power supply (Main remote controller)
LED3 Communication (FTC5-Outdoor unit)
LED4 Reading or writing data to SD card
CNPWM Pump speed control signal for MP1
CN108 SD card connector
OCH571D

16
6-3. EHSC-MECR2.UK, EHSD-MECR2.UK, EHSD-MCR2.UK, ERSC-MECR2.UK
EHSC-MECR3.UK, EHSD-MECR3.UK, EHSD-MCR3.UK, ERSC-MECR3.UK
NL S3S2S1
NL S3S2S1
To outdoor
unit
TB1
OG OG
YE
YE
GNYE
To outdoor
unit
Power supply
~/N 230V 50Hz
TB1
OG
BU
RD
BU
RD
YE
GNYE
1
3
CN3C
(BU)
BK BK
BK
BK
1
3
OG
BN CN3C
(BU) OG
OG
BN
YE
Indoor unit powered
by independent source
Indoor unit powered
via outdoor unit
CIRCUIT BREAKER
1
3
CN3C
(BU)
1
3
CNPWM
(WH)
LED1
LED2
LED3
LED4
TBI.1
1310 12 141174 65 932 81
TBI.2
1310 12 141174 65 932 81
t ° t °
THW8 THW7 THW6
t °
THW9
t °
THWB1
t °
THWB2
t °
Main remote
controller
1 2
12
CN20
(RD)
TH1
t °
13
CN21
(YE)
TH2
t °
14
THW1 THW2
CNW12
(RD)
t ° t °
2
1
THW5 CNW5
(WH)
t °
CN108
5
1
Wireless receiver
(Option)
WiFi adapter
(Option)
5
1
5
1
CNRF
(WH)
CN105
(RD)
CN22
(BU)
1
2
3
4
5
6
Close
Open
N
X15
X12
TBO.4
TBO.3
TBO.2
TBO.1
F1
F2
M
2WV2a
MXV
MP2
MP1
M
1 ~
1
3
1
3CNBHT
(BK)
X11
X9
X8
X13
X10
X4
X14
X3
X2
X1
X5B
X5A
1
2
3
4
5
6
7
8
1
2
3
4
5
6
1
2
3
4
5
6
1
1
3
3
3
CNP1
(WH)
CNPWM
(WH)
TBO.1
TBO.2
TBO.3
TBO.4
CNP1
(WH)
CNP4
(RD)
CN22
(BU)
CNIT
(BU)
TAB1
CN01
(WH)
F2 F1
IEC T6.3AL250V IEC T10AL250V
SW1
SW2
SW3
SW4
SW5
1
8
1
8
1
1
3
1
3
8
1
1
2
3
4
5
6
1
2
3
4
5
6
1
2
3
4
5
6
7
8
1
2
3
4
5
6
8
1
6
CN01
(WH)
CN01
(WH) CN01
(WH)
2
1
4
6
2
1
1
2
4
6
4
6
CNBH
(WH)
CNBC
(GY)
1
1
3
1
2
1
2
1
2
CNBHT
(BK)
1
3
1
3
7
CNIH
(OG)
1
4
1
3
CNW5
(WH)
CN21
(YE)
CNW12
(RD)
CN20
(RD)
TBI.2
126 10
14
8
137 119
4
53
2
1
6
4
2
1
CNIH
(OG)
MP3
M
1 ~
IN8 IN9
IN10
1310 12 141174 65 932 81
TBI.3
IN11
IN12
TBI.3
2 4 6 8 10 12 14
1357 9 11 13
1
4
CN1A
(WH)
2 4 6 8 10 12 14
1357 9 11 13
TBI.1
2WV2b
M
1 ~
TBO.2
3WV
*1
3WV
M
1
~
4 5 6 TBO.2
2WV1
2WV1
M
1
~
4 5 6
M
1 ~
IN6 IN1 IN2 IN3 IN4 IN5 IN7
CNP4
(RD)
MP4
M
1 ~
M
1 ~
1
3
Signal output
(Boiler)
Signal output
(Error)
Signal output
(Defrost)
Signal output
(Comp. ON)
Signal output
(Cooling)
–
+– +– +
CNV1
(WH)
1
5
3
Tool
Tool
Conductor Conductor
Outline view Top view
<How to use TBO.1 to 4>
Connect them using either way as shown below.
1
3
5
7
X6
X7
1
3
CNBC
(GY)
CNBH
(WH)
1
*1 5
3
CNV1
(WH)
Flow
Sensor
14
CN1A
(WH)
Symbol Name
TB1 Terminal block <Power supply, Outdoor unit>
MP1 Water circulation pump 1
(Space heating/cooling & DHW)
MP2 Water circulation pump 2
(Space heating/cooling for Zone1)(Local supply)
MP3 Water circulation pump 3
(Space heating/cooling for Zone2)(Local supply)
MP4 Water circulation pump 4 (DHW)(Local supply)
3WV(2WV1) 3-way valve (2-way valve 1)(Local supply)
2WV2a 2-way valve (For Zone 1)(Local supply)
2WV2b 2-way valve (For Zone 2)(Local supply)
MXV Mixing valve (Local supply)
TH1 Thermistor (Room temp.)(Option)
TH2 Thermistor (Ref. liquid temp.)
THW1 Thermistor (Flow water temp.)
THW2 Thermistor (Return water temp.)
THW5 Thermistor (DHW tank water temp.)(Option)
THW6 Thermistor (Zone1 ow temp.)(Option)
THW7 Thermistor (Zone1 return temp.)(Option)
THW8 Thermistor (Zone2 ow temp.)(Option)
THW9 Thermistor (Zone2 return temp.)(Option)
THWB1 Thermistor (Boiler ow temp.)(Option)
THWB2 Thermistor (Boiler return temp.)(Option)
IN1 Room thermostat 1 (Local supply)
IN2 Flow switch 1 (Local supply)
IN3 Flow switch 2 (Local supply)
IN4 Demand control (Local supply)
IN5 Outdoor thermostat (Local supply)
IN6 Room thermostat 2 (Local supply)
IN7 Flow switch 3 (Local supply)
IN8 Electric energy meter 1 (Local supply)
IN9 Electric energy meter 2 (Local supply)
IN10 Heat meter (Local supply)
IN11 Smart grid ready input (Local supply)
IN12
IN1A Flow sensor
FLOW TEMP. CONTROLLER (FTC5)
TBO.1−4 Terminal block <Outputs>
TBI.1
− 3Terminal block <Signal Inputs, Thermistor>
F1 Fuse (IEC T10AL250V)
F2 Fuse (IEC T6.3AL250V)
SW1
− 5DIP switch *See <6-16. DIP switch functions>.
X1
− 15 Relay
LED1 Power supply (FTC5)
LED2 Power supply (Main remote controller)
LED3 Communication (FTC5-Outdoor unit)
LED4 Reading or writing data to SD card
CNPWM Pump speed control signal for MP1
CN108 SD card connector
1. Symbols used in wiring diagram are, :
connector, : terminal block.
2. Indoor unit and outdoor unit connecting wires have
polarities, make sure to match terminal numbers (S1,
S2, S3) for correct wirings.
3. Since the outdoor unit side electric wiring may change,
be sure to check the outdoor unit electric wiring diagram
for service.
Table 1 Signal Inputs
Name Terminal block Connector Item OFF (Open) ON (Short)
IN1 TBI.1 13-14 — Room thermostat 1 input *1 Refer to SW2-1 in <6-16. DIP switch functions>.
IN2 TBI.1 11-12 — Flow switch 1 input Refer to SW2-2 in <6-16. DIP switch functions>.
IN3 TBI.1 9-10 — Flow switch 2 input (Zone1) Refer to SW3-2 in <6-16. DIP switch functions>.
IN4 TBI.1 7-8 — Demand control input Normal Heat source OFF/ Boiler operation *3
IN5 TBI.1 5-6 — Outdoor thermostat input *2 Standard operation Heater operation/ Boiler operation *3
IN6 TBI.1 3-4 — Room thermostat 2 input *1 Refer to SW3-1 in <6-16. DIP switch functions>.
IN7 TBI.1 1-2 — Flow switch 3 input (Zone2) Refer to SW3-3 in <6-16. DIP switch functions>.
IN8 TBI.3 1-2 — Electric energy meter 1
Refer to installation manual.
IN9 TBI.3 3-4 — Electric energy meter 2
IN10 TBI.3 5-6 — Heat meter
IN11 TBI.3 7-8 — Smart grid ready input
IN12 TBI.3 9-10 —
IN1A TBI.3 12-14 CN1A Flow sensor
*1. Set the ON/OFF cycle time of the room thermostat for 10 minutes or more; otherwise the compressor may be
damaged.
*2. If using outdoor thermostat for controlling operation of heaters, the lifetime of the heaters and related parts may
be reduced.
*3. To turn on the boiler operation, use the main remote controller to select “Boiler” in “External input setting” screen
in the service menu.
Table 2 Outputs
Name Terminal block Connector Item OFF ON
OUT1 TBO.1 1-2 CNP1 Water circulation pump 1 output (Space heating/cooling & DHW) OFF ON
OUT2 TBO.1 3-4 — Water circulation pump 2 output (Space heating/cooling for Zone1) OFF ON
OUT3 TBO.1 5-6 — Water circulation pump 3 output (Space heating/cooling for Zone2) *1 OFF ON
2-way valve 2b output *2
OUT4 TBO.2 4-6 CNV1 3-way valve (2-way valve) output Heating DHW
OUT5
TBO.2 1-2 —Mixing valve output *1 Stop Close
TBO.2 2-3 Open
OUT6 — CNBH 1-3 Booster heater 1 output OFF ON
OUT7 — CNBH 5-7 Booster heater 2 output OFF ON
OUT8 TBO.4 5-6 — Cooling signal output OFF ON
OUT9 TBO.4 3-4 CNIH Immersion heater output OFF ON
OUT10 TBO.3 1-2 — Boiler output OFF ON
OUT11 TBO.3 3-4 — Error output Normal Error
OUT12 TBO.3 5-6 — Defrost output Normal Defrost
OUT13 TBO.4 1-2 — 2-way valve 2a output *2 OFF ON
OUT14 — CNP4 Water circulation pump 4 output (DHW) OFF ON
OUT15 TBO.3 7-8 — Comp. ON signal OFF ON
Do not connect to the terminals that are indicated as “—” in the “Terminal block” eld.
*1. For 2-zone temperature control.
*2. For 2-zone valve ON/OFF control.
OCH571D

NL S3S2S1
NL S3S2S1
To outdoor
unit
TB1
ORN ORN
YLW
YLW
GRN/YLW
To outdoor
unit
Power supply
~/N 230V 50Hz
TB1
ORN
BLU
RED
BLU
RED
YLW
GRN/YLW
1
3
CN3C
(BLU)
BLK BLK
BLK
BLK
1
3
ORN
BRN
CN3C
(BLU) ORN
ORN
BRN
YLW
Indoor unit powered
by independent source
Indoor unit powered
via outdoor unit
CIRCUIT BREAKER
1
3
CN3C
(BLU)
1
3
CNPWM
(WHT)
LED1
LED2
LED3
LED4
TBI.1
1310 12 141174 65 932 81
TBI.2
1310 12 141174 65 932 81
t ° t °
THW8 THW7 THW6
t °
THW9
t °
THWB1
t °
THWB2
t °
Main
controller
1 2
12
CN20
(RED)
TH1
t °
13
CN21
(YLW)
TH2
t °
14
THW1 THW2
CNW12
(RED)
t ° t °
12
THW5 CNW5
(WHT)
t °
CN108
5
1
Wireless receiver
(Option)
WiFi adapter
(Option)
5
1
5
1
CNRF
(WHT)
CN105
(RED)
CN22
(BLU)
1
2
3
4
5
6
1
*1
5
Close
Open
N
X15
X12
TBO.4
TBO.3
TBO.2
TBO.1
F1
F2
M
2WV2a
MXV
MP2
MP1
M
1 ~
1
3
CNV1
(WHT)
1
3CNBHT
(BLK)
X11
X9
X8
X13
X10
X4
X14
X3
X2
X1
X5B
X5A
1
2
3
4
5
6
7
8
1
2
3
4
5
6
1
2
3
4
5
6
1
1
3
3
3
CNP1
(WHT)
CNPWM
(WHT)
TBO.1
TBO.2
TBO.3
TBO.4
CNP1
(WHT)
CNP4
(RED)
CNV1
(WHT)
CN22
(BLU)
CNIT
(BLU)
TAB1
CN01
(WHT)
F2 F1
6.3A 250V 10A 250V
SW1
SW2
SW3
SW4
SW5
1
8
1
8
1
1
5
1
3
1
3
8
1
1
2
3
4
5
6
1
2
3
4
5
6
1
2
3
4
5
6
7
8
1
2
3
4
5
6
8
1
6
CN01
(WHT)
CN01
(WHT)
CN01
(WHT)
2
1
4
6
2
1
1
2
4
6
4
6
CNBH
(WHT)
CNBC
(GRY)
1
1
3
1
2
1
2
1
2
CNBHT
(BLK)
1
3
1
3
7
CNIH
(ORN)
1
4
1
3
CNW5
(WHT)
CN21
(YLW)
CNW12
(RED)
CN20
(RED)
TBI.2
126 10
14
8
137 119
4
53
2
1
6
4
2
1
CNIH
(ORN)
MP3
M
1 ~
IN8 IN9
IN10
1310 12 141174 65 932 81
TBI.3
TBI.3
2 4 6 8 10 12 14
1357 9 11 13
1
4
CN1A
(WHT)
2 4 6 8 10 12 14
1357 9 11 13
TBI.1
2WV2b
M
1 ~
TBO.2
3WV
*1
3WV
M
1
~
4 5 6 TBO.2
2WV1
2WV1
4 5 6
M
1 ~
IN6 IN1 IN2 IN3 IN4 IN5 IN7
WHT WHT
M
1
~
CNP4
(RED)
MP4
M
1 ~
M
1 ~
1
3
–
+– +– +
Signal output
(Boiler)
Signal output
(Error)
Signal output
(Defrost)
Signal output
(Comp ON)
Signal output
(Cooling)
Tool
Tool
Conductor Conductor
Outline view Top view
<How to use TBO.1 to 4>
Connect them using either way as shown below.
2 2
2
ECB1
L
(1)
N
(3)
BHCP
BLU
BLU
RED
WHT/No.2 WHT/No.1
RED
VLT VLT
GRY GRY
BHC1
BHT
642
531 A1
A2
BH1
BHF
24
Power supply
to Booster heater
642
531 A1
A2
CNBH
(WHT)
CNBHT
(BLK)
2
2
2CNBC
(GRY)
1
1
3
3
1
3
~/N 230V 50Hz
1
3
5
7
X6
X7
1
3
CNBC
(GRY)
CNBH
(WHT)
17
6-4. EHSC-VM2C.UK, EHSC-VM2EC.UK, EHSD-VM2C.UK, ERSC-VM2C.UK, ERSD-VM2C.UK, EHPX-VM2C.UK
TH1 Thermistor (Room temp.)(Option)
TH2 Thermistor (Ref. liquid temp.)
THW1 Thermistor (Flow water temp.)
THW2 Thermistor (Return water temp.)
THW5 Thermistor (DHW tank water temp.)(Option)
THW6 Thermistor (Zone1 ow temp.)(Option)
THW7 Thermistor (Zone1 return temp.)(Option)
THW8 Thermistor (Zone2 ow temp.)(Option)
THW9 Thermistor (Zone2 return temp.)(Option)
THWB1 Thermistor (Boiler ow temp.)(Option)
THWB2 Thermistor (Boiler return temp.)(Option)
IN1 Room thermostat 1 (Local supply)
IN2 Flow switch 1 (Local supply)
IN3 Flow switch 2 (Local supply)
IN4 Demand control (Local supply)
IN5 Outdoor thermostat (Local supply)
IN6 Room thermostat 2 (Local supply)
IN7 Flow switch 3 (Local supply)
IN8 Electric energy meter 1 (Local supply)
IN9 Electric energy meter 2 (Local supply)
IN10 Heat meter (Local supply)
FLOW TEMP. CONTROLLER (FTC5)
TBO.1−4 Terminal block <Outputs>
TBI.1
− 3Terminal block <Signal Inputs, Thermistor>
F1 Fuse (T10AL250V)
F2 Fuse (T6.3AL250V)
SW1
− 5DIP switch *See <6-16. DIP switch functions>.
X1
− 15 Relay
LED1 Power supply (FTC5)
LED2 Power supply (Main remote controller)
LED3 Communication (FTC5-Outdoor unit)
LED4 Reading or writing data to SD card
CNPWM Pump speed control signal for MP1
CN108 SD card connector
Table 1 Signal Inputs
Name Terminal block Connector Item OFF (Open) ON (Short)
IN1 TBI.1 13-14 — Room thermostat 1 input Refer to SW2-1 in <6-16. DIP switch functions>.
IN2 TBI.1 11-12 — Flow switch 1 input Refer to SW2-2 in <6-16. DIP switch functions>.
IN3 TBI.1 9-10 — Flow switch 2 input (Zone1) Refer to SW3-2 in <6-16. DIP switch functions>.
IN4 TBI.1 7-8 — Demand control input Normal Heat source OFF/ Boiler operation *2
IN5 TBI.1 5-6 — Outdoor thermostat input *1
Standard operation Heater operation/ Boiler operation *2
IN6 TBI.1 3-4 — Room thermostat 2 input Refer to SW3-1 in <6-16. DIP switch functions>.
IN7 TBI.1 1-2 — Flow switch 3 input (Zone2) Refer to SW3-3 in <6-16. DIP switch functions>.
IN8 TBI.3 1-2 — Electric energy meter 1
Refer to installation manual.IN9 TBI.3 3-4 — Electric energy meter 2
IN10 TBI.3 5-6 — Heat meter
*1. If using outdoor thermostat for controlling operation of heaters, the lifetime of the heaters and related parts may be
reduced.
*2. To turn on the boiler operation, use the main remote controller to select “Boiler” in “External input setting“ screen in
the service menu.
Table 2 Outputs
Name Terminal block Connector Item OFF ON
OUT1 TBO.1 1-2 CNP1 Water circulation pump 1 output (Space heating/cooling & DHW) OFF ON
OUT2 TBO.1 3-4 — Water circulation pump 2 output (Space heating/cooling for Zone1) OFF ON
OUT3 TBO.1 5-6 — Water circulation pump 3 output (Space heating/cooling for Zone2) *1 OFF ON
2-way valve 2b output *2
OUT4 TBO.2 4-6 CNV1 3-way valve (2-way valve) output Heating DHW
OUT5
TBO.2 1-2 —Mixing valve output *1 Stop Close
TBO.2 2-3 Open
OUT6 — CNBH 1-3 Booster heater 1 output OFF ON
OUT7 — CNBH 5-7 Booster heater 2 output OFF ON
OUT8 TBO.4 5-6 — Cooling signal output OFF ON
OUT9 TBO.4 3-4 CNIH Immersion heater output OFF ON
OUT10 TBO.3 1-2 — Boiler output OFF ON
OUT11 TBO.3 3-4 — Error output Normal Error
OUT12 TBO.3 5-6 — Defrost output Normal Defrost
OUT13 TBO.4 1-2 — 2-way valve 2a output *2 OFF ON
OUT14 — CNP4 Water circulation pump 4 output (DHW) OFF ON
OUT15 TBO.3 7-8 — Comp. ON signal OFF ON
Do not connect to the terminals that are indicated as “—” in the “Terminal block” eld.
*1. For 2-zone temperature control.
*2. For 2-zone valve ON/OFF control.
1. Symbols used in wiring diagram are, : connector,
: terminal block.
2. Indoor unit and outdoor unit connecting wires have polarities, make
sure to match terminal numbers (S1, S2, S3) for correct wirings,
3. Since the outdoor unit side electric wiring may change, be sure to
check the outdoor unit electric wiring diagram for service.
Symbol Name
TB1 Terminal block <Power supply, Outdoor unit>
ECB1 Earth leakage circuit breaker for booster heater
MP1 Water circulation pump 1(Space heating/cooling & DHW)
MP2 Water circulation pump 2
(Space heating/cooling for Zone1)(Local supply)
MP3 Water circulation pump 3
(Space heating/cooling for Zone2)(Local supply)
MP4 Water circulation pump 4 (DHW)(Local supply)
3WV(2WV1) 3-way valve (2-way valve 1)(Local supply)
2WV2a 2-way valve (For Zone1)(Local supply)
2WV2b 2-way valve (For Zone2)(Local supply)
MXV Mixing valve (Local supply)
BHT Thermostat for booster heater
BHF Thermal fuse for booster heater
BH1 Booster heater 1
BHC1 Contactor for booster heater 1
BHCP Contactor for booster heater protection
OCH571D

18
6-5. EHSC-VM2CR1.UK, EHSC-VM2ECR1.UK, EHSD-VM2CR1.UK, ERSC-VM2CR1.UK, ERSD-VM2CR1.UK,
EHPX-VM2CR1.UK
NL S3S2S1
NL S3S2S1
To outdoor
unit
TB1
OG OG
YE
YE
GNYE
To outdoor
unit
Power supply
~/N 230V 50Hz
TB1
OG
BU
RD
BU
RD
YE
GNYE
1
3
CN3C
(BU)
BK BK
BK
BK
1
3
OG
BN
CN3C
(BU) OG
OG
BN
YE
Indoor unit powered
by independent source
Indoor unit powered
via outdoor unit
CIRCUIT BREAKER
1
3
CN3C
(BU)
1
3
CNPWM
(WH)
LED1
LED2
LED3
LED4
TBI.1
1310 12 141174 65 932 81
TBI.2
1310 12 141174 65 932 81
t ° t °
THW8 THW7 THW6
t °
THW9
t °
THWB1
t °
THWB2
t °
Main remote
controller
1 2
12
CN20
(RD)
TH1
t °
13
CN21
(YE)
TH2
t °
14
THW1 THW2
CNW12
(RD)
t ° t °
12
THW5 CNW5
(WH)
t °
CN108
5
1
Wireless receiver
(Option)
WiFi adapter
(Option)
5
1
5
1
CNRF
(WH)
CN105
(RD)
CN22
(BU)
1
2
3
4
5
6
1
*1 5
3
Close
Open
N
X15
X12
TBO.4
TBO.3
TBO.2
TBO.1
F1
F2
M
2WV2a
MXV
MP2
MP1
M
1 ~
1
3
CNV1
(WH)
1
3CNBHT
(BK)
X11
X9
X8
X13
X10
X4
X14
X3
X2
X1
X5B
X5A
1
2
3
4
5
6
7
8
1
2
3
4
5
6
1
2
3
4
5
6
1
1
3
3
3
CNP1
(WH)
CNPWM
(WH)
TBO.1
TBO.2
TBO.3
TBO.4
CNP1
(WH)
CNP4
(RD)
CNV1
(WH)
CN22
(BU)
CNIT
(BU)
TAB1
CN01
(WH)
F2 F1
IEC T6.3AL250V IEC T10AL250V
SW1
SW2
SW3
SW4
SW5
1
8
1
8
1
1
5
3
1
3
1
3
8
1
1
2
3
4
5
6
1
2
3
4
5
6
1
2
3
4
5
6
7
8
1
2
3
4
5
6
8
1
6
CN01
(WH)
CN01
(WH)
CN01
(WH)
2
1
4
6
2
1
1
2
4
6
4
6
CNBH
(WH)
CNBC
(GY)
1
1
3
1
2
1
2
1
2
CNBHT
(BK)
1
3
1
3
7
CNIH
(OG)
1
4
1
3
CNW5
(WH)
CN21
(YE)
CNW12
(RD)
CN20
(RD)
TBI.2
126 10
14
8
137 119
4
53
2
1
6
4
2
1
CNIH
(OG)
MP3
M
1 ~
IN8 IN9
IN10
1310 12 141174 65 932 81
TBI.3
TBI.3
2 4 6 8 10 12 14
1357 9 11 13
1
4
CN1A
(WH)
2 4 6 8 10 12 14
1357 9 11 13
TBI.1
2WV2b
M
1 ~
TBO.2
3WV
*1
3WV
M
1
~
4 5 6 TBO.2
2WV1
2WV1
4 5 6
M
1 ~
IN6 IN1 IN2 IN3 IN4 IN5 IN7
WH WH
M
1
~
CNP4
(RD)
MP4
M
1 ~
M
1 ~
1
3
–
+– +– +
Signal output
(Boiler)
Signal output
(Error)
Signal output
(Defrost)
Signal output
(Comp. ON)
Signal output
(Cooling)
Flow
Sensor
14
CN1A
(WH)
Tool
Tool
Conductor Conductor
Outline view Top view
<How to use TBO.1 to 4>
Connect them using either way as shown below.
2 2
2
ECB1
L
(1)
N
(3)
BHCP
BU
BU
RD
WH/No.2 WH/No.1
RD
VT VT
GY GY
BHC1
BHT
642
531 A1
A2
BH1
BHF
24
Power supply
to Booster heater
642
531 A1
A2
CNBH
(WH)
CNBHT
(BK)
2
2
2CNBC
(GY)
1
1
3
3
1
3
~/N 230V 50Hz
1
3
5
7
X6
X7
1
3
CNBC
(GY)
CNBH
(WH)
1. Symbols used in wiring diagram are,
: connector, : terminal block.
2. Indoor unit and outdoor unit connecting
wires have polarities, make sure to match
terminal numbers (S1, S2, S3) for correct
wirings.
3. Since the outdoor unit side electric wiring
may change, be sure to check the outdoor
unit electric wiring diagram for service.
Table 1 Signal Inputs
Name Terminal block Connector Item OFF (Open) ON (Short)
IN1 TBI.1 13-14 — Room thermostat
1 input
Refer to SW2-1 in
<6-16. DIP switch functions>.
IN2 TBI.1 11-12 — Flow switch 1
input
Refer to SW2-2 in
<6-16. DIP switch functions>.
IN3 TBI.1 9-10 — Flow switch 2
input (Zone1)
Refer to SW3-2 in
<6-16. DIP switch functions>.
IN4 TBI.1 7-8 — Demand control
input Normal Heat source OFF/
Boiler operation *2
IN5 TBI.1 5-6 — Outdoor thermo-
stat input *1
Standard opera-
tion
Heater operation/
Boiler operation *2
IN6 TBI.1 3-4 — Room thermostat
2 input
Refer to SW3-1 in
<6-16. DIP switch functions>.
IN7 TBI.1 1-2 — Flow switch 3
input (Zone2)
Refer to SW3-3 in
<6-16. DIP switch functions>.
IN8 TBI.3 1-2 — Electric energy
meter 1
Refer to installation manual.
IN9 TBI.3 3-4 — Electric energy
meter 2
IN10 TBI.3 5-6 — Heat meter
IN1A TBI.3 12-14 CN1A Flow sensor
*1. If using outdoor thermostat for controlling operation of heaters, the lifetime of the
heaters and related parts may be reduced.
*2. To turn on the boiler operation, use the main remote controller to select “Boiler” in
“External input setting” screen in the service menu.
Table 2 Outputs
Name Terminal block Connector Item OFF ON
OUT1 TBO.1 1-2 CNP1 Water circulation pump 1 output (Space heating/cooling &
DHW) OFF ON
OUT2 TBO.1 3-4 — Water circulation pump 2 output (Space heating/cooling
for Zone1) OFF ON
OUT3 TBO.1 5-6 —
Water circulation pump 3 output (Space heating/cooling
for Zone2) *1 OFF ON
2-way valve 2b output *2
OUT4 TBO.2 4-6 CNV1 3-way valve (2-way valve) output Heating DHW
OUT5
TBO.2 1-2 —Mixing valve output *1 Stop Close
TBO.2 2-3 Open
OUT6 — CNBH 1-3 Booster heater 1 output OFF ON
OUT7 — CNBH 5-7 Booster heater 2 output OFF ON
OUT8 TBO.4 5-6 — Cooling signal output OFF ON
OUT9 TBO.4 3-4 CNIH Immersion heater output OFF ON
OUT10 TBO.3 1-2 — Boiler output OFF ON
OUT11 TBO.3 3-4 — Error output Normal Error
OUT12 TBO.3 5-6 — Defrost output Normal Defrost
OUT13 TBO.4 1-2 — 2-way valve 2a output *2 OFF ON
OUT14 — CNP4 Water circulation pump 4 output (DHW) OFF ON
OUT15 TBO.3 7-8 — Comp. ON signal OFF ON
Do not connect to the terminals that are indicated as “—” in the “Terminal block” eld.
*1. For 2-zone temperature control.
*2. For 2-zone valve ON/OFF control.
Symbol Name
TB1 Terminal block <Power supply, Outdoor unit>
ECB1 Earth leakage circuit breaker for booster heater
MP1 Water circulation pump 1(Space heating & DHW)
MP2 Water circulation pump 2
(Space heating for Zone1)(Local supply)
MP3 Water circulation pump 3
(Space heating for Zone2)(Local supply)
MP4 Water circulation pump 4 (DHW)(Local supply)
3WV(2WV1) 3-way valve (2-way valve 1)(Local supply)
2WV2a 2-way valve (For Zone 1)(Local supply)
2WV2b 2-way valve (For Zone 2)(Local supply)
MXV Mixing valve (Local supply)
BHT Thermostat for booster heater
BHF Thermal fuse for booster heater
BH1 Booster heater 1
BHC1 Contactor for booster heater 1
BHCP Contactor for booster heater protection
TH1 Thermistor (Room temp.)(Option)
Symbol Name
TH2 Thermistor (Ref. liquid temp.)
THW1 Thermistor (Flow water temp.)
THW2 Thermistor (Return water temp.)
THW5 Thermistor (DHW tank water temp.)(Option)
THW6 Thermistor (Zone1 ow temp.)(Option)
THW7 Thermistor (Zone1 return temp.)(Option)
THW8 Thermistor (Zone2 ow temp.)(Option)
THW9 Thermistor (Zone2 return temp.)(Option)
THWB1 Thermistor (Boiler ow temp.)(Option)
THWB2 Thermistor (Boiler return temp.)(Option)
IN1 Room thermostat 1 (Local supply)
IN2 Flow switch 1 (Local supply)
IN3 Flow switch 2 (Local supply)
IN4 Demand control (Local supply)
IN5 Outdoor thermostat (Local supply)
IN6 Room thermostat 2 (Local supply)
IN7 Flow switch 3 (Local supply)
Symbol Name
IN8 Electric energy meter 1 (Local supply)
IN9 Electric energy meter 2 (Local supply)
IN10 Heat meter (Local supply)
IN1A Flow sensor
FLOW TEMP. CONTROLLER (FTC5)
TBO.1−4 Terminal block <Outputs>
TBI.1
− 3Terminal block <Signal Inputs, Thermistor>
F1 Fuse (IEC T10AL250V)
F2 Fuse (IEC T6.3AL250V)
SW1
− 5DIP switch *See <6-16. DIP switch functions>.
X1
− 15 Relay
LED1 Power supply (FTC5)
LED2 Power supply (Main remote controller)
LED3 Communication (FTC5-Outdoor unit)
LED4 Reading or writing data to SD card
CNPWM Pump speed control signal for MP1
CN108 SD card connector
OCH571D

19
6-6. EHSC-VM2CR2.UK, EHSC-VM2ECR2.UK, EHSD-VM2CR2.UK, ERSC-VM2CR2.UK, ERSD-VM2CR2.UK, EHPX-VM2CR2.UK
EHSC-VM2CR3.UK, EHSC-VM2ECR3.UK, EHSD-VM2CR3.UK, ERSC-VM2CR3.UK, ERSD-VM2CR3.UK, EHPX-VM2CR3.UK
NL S3S2S1
NL S3S2S1
To outdoor
unit
TB1
OG OG
YE
YE
GNYE
To outdoor
unit
Power supply
~/N 230V 50Hz
TB1
OG
BU
RD
BU
RD
YE
GNYE
1
3
CN3C
(BU)
BK BK
BK
BK
1
3
OG
BN
CN3C
(BU) OG
OG
BN
YE
Indoor unit powered
by independent source
Indoor unit powered
via outdoor unit
CIRCUIT BREAKER
1
3
CN3C
(BU)
1
3
CNPWM
(WH)
LED1
LED2
LED3
LED4
TBI.1
1310 12 141174 65 932 81
TBI.2
1310 12 141174 65 932 81
t ° t °
THW8 THW7 THW6
t °
THW9
t °
THWB1
t °
THWB2
t °
Main remote
controller
1 2
12
CN20
(RD)
TH1
t °
13
CN21
(YE)
TH2
t °
14
THW1 THW2
CNW12
(RD)
t ° t °
12
THW5 CNW5
(WH)
t °
CN108
5
1
Wireless receiver
(Option)
WiFi adapter
(Option)
5
1
5
1
CNRF
(WH)
CN105
(RD)
CN22
(BU)
1
2
3
4
5
6
1
*1 5
3
Close
Open
N
X15
X12
TBO.4
TBO.3
TBO.2
TBO.1
F1
F2
M
2WV2a
MXV
MP2
MP1
M
1 ~
1
3
CNV1
(WH)
1
3CNBHT
(BK)
X11
X9
X8
X13
X10
X4
X14
X3
X2
X1
X5B
X5A
1
2
3
4
5
6
7
8
1
2
3
4
5
6
1
2
3
4
5
6
1
1
3
3
3
CNP1
(WH)
CNPWM
(WH)
TBO.1
TBO.2
TBO.3
TBO.4
CNP1
(WH)
CNP4
(RD)
CNV1
(WH)
CN22
(BU)
CNIT
(BU)
TAB1
CN01
(WH)
F2 F1
IEC T6.3AL250V IEC T10AL250V
SW1
SW2
SW3
SW4
SW5
1
8
1
8
1
1
5
3
1
3
1
3
8
1
1
2
3
4
5
6
1
2
3
4
5
6
1
2
3
4
5
6
7
8
1
2
3
4
5
6
8
1
6
CN01
(WH)
CN01
(WH)
CN01
(WH)
2
1
4
6
2
1
1
2
4
6
4
6
CNBH
(WH)
CNBC
(GY)
1
1
3
1
2
1
2
1
2
CNBHT
(BK)
1
3
1
3
7
CNIH
(OG)
1
4
1
3
CNW5
(WH)
CN21
(YE)
CNW12
(RD)
CN20
(RD)
TBI.2
126 10
14
8
137 119
4
53
2
1
6
4
2
1
CNIH
(OG)
MP3
M
1 ~
IN8 IN9
IN10
1310 12 141174 65 932 81
TBI.3
IN11
IN12
TBI.3
2 4 6 8 10 12 14
1357 9 11 13
1
4
CN1A
(WH)
2 4 6 8 10 12 14
1357 9 11 13
TBI.1
2WV2b
M
1 ~
TBO.2
3WV
*1
3WV
M
1
~
4 5 6 TBO.2
2WV1
2WV1
4 5 6
M
1 ~
IN6 IN1 IN2 IN3 IN4 IN5 IN7
WH WH
M
1
~
CNP4
(RD)
MP4
M
1 ~
M
1 ~
1
3
–
+– +– +
Signal output
(Boiler)
Signal output
(Error)
Signal output
(Defrost)
Signal output
(Comp. ON)
Signal output
(Cooling)
Flow
Sensor
14
CN1A
(WH)
Tool
Tool
Conductor Conductor
Outline view Top view
<How to use TBO.1 to 4>
Connect them using either way as shown below.
2 2
2
ECB1
L
(1)
N
(3)
BHCP
BU
BU
RD
WH/No.2 WH/No.1
RD
VT VT
GY GY
BHC1
BHT
642
531 A1
A2
BH1
BHF
24
Power supply
to Booster heater
642
531 A1
A2
CNBH
(WH)
CNBHT
(BK)
2
2
2CNBC
(GY)
1
1
3
3
1
3
~/N 230V 50Hz
1
3
5
7
X6
X7
1
3
CNBC
(GY)
CNBH
(WH)
Symbol Name
TB1 Terminal block <Power supply, Outdoor unit>
ECB1 Earth leakage circuit breaker for booster heater
MP1 Water circulation pump 1(Space heating & DHW)
MP2 Water circulation pump 2
(Space heating for Zone1)(Local supply)
MP3 Water circulation pump 3
(Space heating for Zone2)(Local supply)
MP4 Water circulation pump 4 (DHW)(Local supply)
3WV(2WV1) 3-way valve (2-way valve 1)(Local supply)
2WV2a 2-way valve (For Zone 1)(Local supply)
2WV2b 2-way valve (For Zone 2)(Local supply)
MXV Mixing valve (Local supply)
BHT Thermostat for booster heater
BHF Thermal fuse for booster heater
BH1 Booster heater 1
BHC1 Contactor for booster heater 1
BHCP Contactor for booster heater protection
TH1 Thermistor (Room temp.)(Option)
TH2 Thermistor (Ref. liquid temp.)
THW1 Thermistor (Flow water temp.)
THW2 Thermistor (Return water temp.)
THW5 Thermistor (DHW tank water temp.)(Option)
THW6 Thermistor (Zone1 ow temp.)(Option)
THW7 Thermistor (Zone1 return temp.)(Option)
THW8 Thermistor (Zone2 ow temp.)(Option)
THW9 Thermistor (Zone2 return temp.)(Option)
THWB1 Thermistor (Boiler ow temp.)(Option)
THWB2 Thermistor (Boiler return temp.)(Option)
IN1 Room thermostat 1 (Local supply)
IN2 Flow switch 1 (Local supply)
IN3 Flow switch 2 (Local supply)
IN4 Demand control (Local supply)
IN5 Outdoor thermostat (Local supply)
IN6 Room thermostat 2 (Local supply)
IN7 Flow switch 3 (Local supply)
IN8 Electric energy meter 1 (Local supply)
IN9 Electric energy meter 2 (Local supply)
IN10 Heat meter (Local supply)
IN11 Smart grid ready input (Local supply)
IN12
IN1A Flow sensor
FLOW TEMP. CONTROLLER (FTC5)
TBO.1−4 Terminal block <Outputs>
TBI.1
− 3Terminal block <Signal Inputs, Thermistor>
F1 Fuse (IEC T10AL250V)
F2 Fuse (IEC T6.3AL250V)
SW1
− 5DIP switch *See <6-16. DIP switch functions>.
X1
− 15 Relay
LED1 Power supply (FTC5)
LED2 Power supply (Main remote controller)
LED3 Communication (FTC5-Outdoor unit)
LED4 Reading or writing data to SD card
CNPWM Pump speed control signal for MP1
CN108 SD card connector
1. Symbols used in wiring diagram are, :
connector, : terminal block.
2. Indoor unit and outdoor unit connecting wires
have polarities, make sure to match terminal
numbers (S1, S2, S3) for correct wirings.
3. Since the outdoor unit side electric wiring
may change, be sure to check the outdoor unit
electric wiring diagram for service.
Table 1 Signal Inputs
Name Terminal block Connector Item OFF (Open) ON (Short)
IN1 TBI.1 13-14 — Room thermostat 1 input *1 Refer to SW2-1 in <6-16. DIP switch functions>.
IN2 TBI.1 11-12 — Flow switch 1 input Refer to SW2-2 in <6-16. DIP switch functions>.
IN3 TBI.1 9-10 — Flow switch 2 input (Zone1) Refer to SW3-2 in <6-16. DIP switch functions>.
IN4 TBI.1 7-8 — Demand control input Normal Heat source OFF/ Boiler operation *3
IN5 TBI.1 5-6 — Outdoor thermostat input *2 Standard operation Heater operation/ Boiler operation *3
IN6 TBI.1 3-4 — Room thermostat 2 input *1 Refer to SW3-1 in <6-16. DIP switch functions>.
IN7 TBI.1 1-2 — Flow switch 3 input (Zone2) Refer to SW3-3 in <6-16. DIP switch functions>.
IN8 TBI.3 1-2 — Electric energy meter 1
Refer to installation manual.
IN9 TBI.3 3-4 — Electric energy meter 2
IN10 TBI.3 5-6 — Heat meter
IN11 TBI.3 7-8 — Smart grid ready input
IN12 TBI.3 9-10 —
IN1A TBI.3 12-14 CN1A Flow sensor
*1. Set the ON/OFF cycle time of the room thermostat for 10 minutes or more; otherwise the compressor may be dam-
aged.
*2. If using outdoor thermostat for controlling operation of heaters, the lifetime of the heaters and related parts may be
reduced.
*3. To turn on the boiler operation, use the main remote controller to select “Boiler” in “External input setting” screen in
the service menu.
Table 2 Outputs
Name Terminal block Connector Item OFF ON
OUT1 TBO.1 1-2 CNP1 Water circulation pump 1 output (Space heating/cooling & DHW) OFF ON
OUT2 TBO.1 3-4 — Water circulation pump 2 output (Space heating/cooling for Zone1) OFF ON
OUT3 TBO.1 5-6 — Water circulation pump 3 output (Space heating/cooling for Zone2) *1 OFF ON
2-way valve 2b output *2
OUT4 TBO.2 4-6 CNV1 3-way valve (2-way valve) output Heating DHW
OUT5
TBO.2 1-2 —Mixing valve output *1 Stop Close
TBO.2 2-3 Open
OUT6 — CNBH 1-3 Booster heater 1 output OFF ON
OUT7 — CNBH 5-7 Booster heater 2 output OFF ON
OUT8 TBO.4 5-6 — Cooling signal output OFF ON
OUT9 TBO.4 3-4 CNIH Immersion heater output OFF ON
OUT10 TBO.3 1-2 — Boiler output OFF ON
OUT11 TBO.3 3-4 — Error output Normal Error
OUT12 TBO.3 5-6 — Defrost output Normal Defrost
OUT13 TBO.4 1-2 — 2-way valve 2a output *2 OFF ON
OUT14 — CNP4 Water circulation pump 4 output (DHW) OFF ON
OUT15 TBO.3 7-8 — Comp. ON signal OFF ON
Do not connect to the terminals that are indicated as “—” in the “Terminal block” eld.
*1. For 2-zone temperature control.
*2. For 2-zone valve ON/OFF control.
OCH571D

NL S3S2S1
NL S3S2S1
To outdoor
unit
TB1
ORN ORN
YLW
YLW
GRN/YLW
To outdoor
unit
Power supply
~/N 230V 50Hz
TB1
ORN
BLU
RED
BLU
RED
YLW
GRN/YLW
1
3
BLK BLK
BLK
BLK
1
3
ORN
BRN
ORN
ORN
BRN
YLW
Indoor unit powered
by independent source
Indoor unit powered
via outdoor unit
CIRCUIT BREAKER
1
3
CN3C
(BLU)
1
3
CNPWM
(WHT)
LED1
LED2
LED3
LED4
TBI.1
1310 12 141174 65 932 81
TBI.2
1310 12 141174 65 932 81
t ° t °
THW8 THW7 THW6
t °
THW9
t °
THWB1
t °
THWB2
t °
Main
controller
1 2
12
CN20
(RED)
TH1
t °
13
CN21
(YLW)
TH2
t °
14
THW1 THW2
CNW12
(RED)
t ° t °
12
THW5 CNW5
(WHT)
t °
CN108
5
1
Wireless receiver
(Option)
WiFi adapter
(Option)
5
1
5
1
CN22
(BLU)
1
2
3
4
5
6
1
*1
5
Close
Open
N
X15
X12
TBO.4
TBO.3
TBO.2
TBO.1
F1
F2
M
2WV2a
MXV
MP2
MP1
M
1 ~
1
3
CNV1
(WHT)
1
3CNBHT
(BLK)
X11
X9
X8
X13
X10
X4
X14
X3
X2
X1
X5B
X5A
1
2
3
4
5
6
7
8
1
2
3
4
5
6
1
2
3
4
5
6
1
1
3
3
3
CNP1
(WHT)
CNPWM
(WHT)
TBO.1
TBO.2
TBO.3
TBO.4
CNP1
(WHT)
CNP4
(RED)
CNV1
(WHT)
TAB1
F2 F1
6.3A 250V 10A 250V
SW1
SW2
SW3
SW4
SW5
1
8
1
8
1
1
5
1
3
1
3
8
1
1
2
3
4
5
6
1
2
3
4
5
6
1
2
3
4
5
6
7
8
1
2
3
4
5
6
8
1
6
CN01
(WHT)
2
1
4
6
2
1
1
2
4
6
4
6
CNBH
(WHT)
CNBC
(GRY)
1
1
3
1
2
1
2
1
2
CNBHT
(BLK)
1
3
1
3
7
CNIH
(ORN)
1
4
1
3
CNW5
(WHT)
CN21
(YLW)
CNW12
(RED)
CN20
(RED)
TBI.2
126 10
14
8
137 119
4
53
2
1
6
4
2
1
CNIH
(ORN)
MP3
M
1 ~
IN8 IN9
IN10
1310 12 141174 65 932 81
TBI.3
TBI.3
2 4 6 8 10 12 14
1357 9 11 13
1
4
CN1A
(WHT)
2 4 6 8 10 12 14
1357 9 11 13
TBI.1
2WV2b
M
1 ~
TBO.2
3WV
*1
3WV
M
1
~
4 5 6 TBO.2
2WV1
2WV1
4 5 6
M
1 ~
M
1
~
IN6 IN1 IN2 IN3 IN4 IN5 IN7
WHT WHT
CNP4
(RED)
MP4
M
1 ~
M
1 ~
1
3
1
3
5
7
X6
X7
1
3
CNBC
(GRY)
CNBH
(WHT)
CNRF
(WHT)
CN105
(RED)
CN22
(BLU)
CNIT
(BLU)
CN01
(WHT)
CN3C
(BLU)
CN01
(WHT)
CN3C
(BLU)
CN01
(WHT)
–
+– +– +
Tool
Tool
Conductor Conductor
Outline view Top view
<How to use TBO.1 to 4>
Connect them using either way as shown below.
2 2 2
2
ECB1
L
(1)
N
(3)
BHCP
BLU
BLU
BLU
REDRED
BLU/No.3
WHT/No.2 WHT/No.1
BLU/No.4
RED
VLT VLT
PNK
PNK
GRY GRY
BHC2
BHC1
BHT
642
531 A1
A2
642
531 A1
A2
BH1
BHF
BH2
24
Power supply
to Booster heater
642
531 A1
A2
CNBH
(WHT)
CNBHT
(BLK)
2
2
2
2CNBC
(GRY)
1
1
3
5
7
3
1
3
~/N 230V 50Hz
Signal output
(Boiler)
Signal output
(Error)
Signal output
(Defrost)
Signal output
(Comp ON)
Signal output
(Cooling)
20
6-7. EHSC-VM6C.UK, EHSC-VM6EC.UK, EHPX-VM6C.UK
BHCP Contactor for booster heater protection
TH1 Thermistor (Room temp.)(Option)
TH2 Thermistor (Ref. liquid temp.)
THW1 Thermistor (Flow water temp.)
THW2 Thermistor (Return water temp.)
THW5 Thermistor (DHW tank water temp.)(Option)
THW6 Thermistor (Zone1 ow temp.)(Option)
THW7 Thermistor (Zone1 return temp.)(Option)
THW8 Thermistor (Zone2 ow temp.)(Option)
THW9 Thermistor (Zone2 return temp.)(Option)
THWB1 Thermistor (Boiler ow temp.)(Option)
THWB2 Thermistor (Boiler return temp.)(Option)
IN1 Room thermostat 1 (Local supply)
IN2 Flow switch 1 (Local supply)
IN3 Flow switch 2 (Local supply)
IN4 Demand control (Local supply)
IN5 Outdoor thermostat (Local supply)
IN6 Room thermostat 2 (Local supply)
IN7 Flow switch 3 (Local supply)
IN8 Electric energy meter 1 (Local supply)
IN9 Electric energy meter 2 (Local supply)
IN10 Heat meter (Local supply)
FLOW TEMP. CONTROLLER (FTC5)
TBO.1−4 Terminal block <Outputs>
TBI.1
− 3Terminal block <Signal Inputs, Thermistor>
F1 Fuse (T10AL250V)
F2 Fuse (T6.3AL250V)
SW1
− 5DIP switch *See <6-16. DIP switch functions>.
X1
− 15 Relay
LED1 Power supply (FTC5)
LED2 Power supply (Main remote controller)
LED3 Communication (FTC5-Outdoor unit)
LED4 Reading or writing data to SD card
CNPWM Pump speed control signal for MP1
CN108 SD card connector
Table 1 Signal Inputs
Name Terminal block Connector Item OFF (Open) ON (Short)
IN1 TBI.1 13-14 — Room thermostat 1 input Refer to SW2-1 in <6-16. DIP switch functions>.
IN2 TBI.1 11-12 — Flow switch 1 input Refer to SW2-2 in <6-16. DIP switch functions>.
IN3 TBI.1 9-10 — Flow switch 2 input (Zone1) Refer to SW3-2 in <6-16. DIP switch functions>.
IN4 TBI.1 7-8 — Demand control input Normal Heat source OFF/ Boiler operation *2
IN5 TBI.1 5-6 — Outdoor thermostat input *1 Standard operation Heater operation/ Boiler operation *2
IN6 TBI.1 3-4 — Room thermostat 2 input Refer to SW3-1 in <6-16. DIP switch functions>.
IN7 TBI.1 1-2 — Flow switch 3 input (Zone2) Refer to SW3-3 in <6-16. DIP switch functions>.
IN8 TBI.3 1-2 — Electric energy meter 1
Refer to installation manual.IN9 TBI.3 3-4 — Electric energy meter 2
IN10 TBI.3 5-6 — Heat meter
*1. If using outdoor thermostat for controlling operation of heaters, the lifetime of the heaters and related parts may
be reduced.
*2. To turn on the boiler operation, use the main remote controller to select “Boiler” in “External input setting“ screen
in the service menu.
Table 2 Outputs
Name Terminal block Connector Item OFF ON
OUT1 TBO.1 1-2 CNP1 Water circulation pump 1 output (Space heating/cooling & DHW) OFF ON
OUT2 TBO.1 3-4 — Water circulation pump 2 output (Space heating/cooling for Zone1) OFF ON
OUT3 TBO.1 5-6 —
Water circulation pump 3 output (Space heating/cooling for Zone2) *1
OFF ON
2-way valve 2b output *2
OUT4 TBO.2 4-6 CNV1 3-way valve (2-way valve) output Heating DHW
OUT5
TBO.2 1-2 —Mixing valve output *1 Stop Close
TBO.2 2-3 Open
OUT6 — CNBH 1-3 Booster heater 1 output OFF ON
OUT7 — CNBH 5-7 Booster heater 2 output OFF ON
OUT8 TBO.4 5-6 — Cooling signal output OFF ON
OUT9 TBO.4 3-4 CNIH Immersion heater output OFF ON
OUT10 TBO.3 1-2 — Boiler output OFF ON
OUT11 TBO.3 3-4 — Error output Normal Error
OUT12 TBO.3 5-6 — Defrost output Normal Defrost
OUT13 TBO.4 1-2 — 2-way valve 2a output *2 OFF ON
OUT14 — CNP4 Water circulation pump 4 output (DHW) OFF ON
OUT15 TBO.3 7-8 — Comp. ON signal OFF ON
Do not connect to the terminals that are indicated as “—” in the “Terminal block” eld.
*1. For 2-zone temperature control.
*2. For 2-zone valve ON/OFF control.
1. Symbols used in wiring diagram are, : connector,
: terminal block.
2. Indoor unit and outdoor unit connecting wires have polarities,
make sure to match terminal numbers (S1, S2, S3) for correct
wirings,
3. Since the outdoor unit side electric wiring may change, be sure to
check the outdoor unit electric wiring diagram for service. Symbol Name
TB1 Terminal block <Power supply, Outdoor unit>
ECB1 Earth leakage circuit breaker for booster heater
MP1 Water circulation pump 1(Space heating/cooling & DHW)
MP2 Water circulation pump 2
(Space heating/cooling for Zone1)(Local supply)
MP3 Water circulation pump 3
(Space heating/cooling for Zone2)(Local supply)
MP4 Water circulation pump 4 (DHW)(Local supply)
3WV(2WV1) 3-way valve (2-way valve 1)(Local supply)
2WV2a 2-way valve (For Zone1)(Local supply)
2WV2b 2-way valve (For Zone2)(Local supply)
MXV Mixing valve (Local supply)
BHT Thermostat for booster heater
BHF Thermal fuse for booster heater
BH1 Booster heater 1
BH2 Booster heater 2
BHC1 Contactor for booster heater 1
BHC2 Contactor for booster heater 2
OCH571D