Mitsubishi Electric EHSD-MEC.UK User manual

SERVICE MANUAL
CONTENTS
1. REFERENCE MANUAL................................... 2
2. SAFETY PRECAUTION................................... 3
3. SPECIFICATIONS............................................ 6
4. PART NAMES AND FUNCTIONS .................. 7
5. OUTLINES AND DIMENSIONS....................... 8
6. WIRING DIAGRAM........................................ 10
7. FIELD WIRING............................................... 16
8. WATER SYSTEM DIAGRAM......................... 18
9. CONTROLS ................................................... 21
10. TROUBLESHOOTING................................... 41
11. DISASSEMBLY PROCEDURE...................... 58
12. SUPPLEMENTARY INFORMATION ............. 79
13. SERVICE AND MAINTENANCE ................... 80
Note:
•This manual describes
only service data of
Hydrobox.
•RoHS compliant products
have <G> mark on the
spec name plate.
R410A
MAIN REMOTE
CONTROLLER
PARTS CATALOG (OCB571)
HYDROBOX
[Model name]
EHSD-MEC
EHSD-VM2C
EHSC-MEC
EHSC-VM2C
EHSC-VM2EC
EHSC-VM6C
EHSC-VM6EC
EHSC-YM9C
EHSC-YM9EC
EHSC-TM9C
ERSD-VM2C
ERSC-MEC
ERSC-VM2C
EHPX-VM2C
EHPX-YM9C
[Service Ref.]
EHSD-MEC.UK
EHSD-VM2C.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-YM9C.UK
October 2014
HYDROBOX
No. OCH571

2
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-W85VHA2-BS.UK OCH465
PUHZ-W85VHA2(R1)-BS.UK
PUHZ-W112VHA(-BS) OCH562
PUHZ-HW112/140YHA(-BS)
OCH439
PUHZ-HW112/140YHA2(-BS)
PUHZ-HW112/140YHA2R1(-BS)
PUHZ-HW112/140YHA2R3(-BS)
PUHZ-HW112/140YHA2R4(-BS)
PUHZ-HW140VHA(-BS)
PUHZ-HW140VHA2(-BS)
PUHZ-HW140VHA2R1(-BS)
PUHZ-HW140VHA2R2-BS
PUHZ-HW140VHA2R3(-BS)
PUHZ-HW140VHA2R4(-BS)
PUHZ-SW40/50VHA(-BS) OCH525
PUHZ-SW40/50VHAR1(-BS)
PUHZ-SW75/100/120VHA(-BS)
OCH533PUHZ-SW100/125YHA(-BS)
PUHZ-SW100/125YHAR1(-BS)
PUHZ-SHW80/112VHA
OCH526
PUHZ-SHW80/112VHAR2(-BS).UK
PUHZ-SWH112/140YHA(R1)
PUHZ-SWH112/140YHAR2(-BS).UK
PUHZ-FRP71VHA OCH544
SUHZ-SW45VA(H).TH OCH557
SUHZ-SW45VA(H)R1.TH
OCH571

3
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 contains 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.
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.
OCH571

4
CAUTION (SPLIT MODELS ONLY)
<Using R410A refrigerant heat pumps>
Use C1220 copper phosphorus, for copper and copper alloy seamless pipes, to connect the refrigerant pipes. Make sure the insides of the pipes are clean and
do not contain any harmful contaminants such as sulfuric compounds, oxidants, debris, or dust. Use pipes with the specied thickness. (Refer to 4.4 in the instal-
lation manual.) Note the following if reusing existing pipes that carried R22 refrigerant.
- Replace the existing are nuts and are the ared sections again.
- Do not use thin pipes. (Refer to 4.4 in the installation manual.)
Store the pipes to be used during installation indoors and keep both ends of the pipes sealed until just before brazing. (Leave elbow joints, etc. in their 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)
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.
OCH571

Gravimeter
Unit
5
[1] Cautions for service
(1) Perform service after recovering the refrigerant left in unit completely.
(2) Do not release refrigerant in the air.
(3) After completing service, charge the cycle with specified amount of refrigerant.
(4) When performing service, install a filter drier simultaneously.
Be sure to use a filter drier for new refrigerant.
[2] Additional refrigerant charge
When charging directly from refrigerant cylinder
· Check that refrigerant cylinder for R410A on the market is syphon type.
· Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)
[3] Service tools
Use the service tools below as exclusive tools for R410A refrigerant.
No. Tool name Specifications
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 —
OCH571

6
SPECIFICATIONS
3
Model name
EHSD-MEC EHSD-VM2C EHSC-MEC EHSC-VM2C EHSC-VM2EC EHSC-VM6C EHSC-VM6EC EHSC-YM9C EHSC-YM9EC EHSC-TM9C ERSD-VM2C ERSC-MEC ERSC-VM2C EHPX-VM2C EHPX-YM9C
Overall unit dimensions 800 × 530 × 360 mm (Height × Width × Depth) Weight (empty) 38 kg 44 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
Weight (full) 44 kg 50 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
Plate heat exchanger (MWA2) — — — — —
Plate heat exchanger (MWA1) ———————— ————
Cooling mode NOT available Available NOT available
Unvented expansion vessel(Primary heat- ing)
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 (Pri- mary)
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 28mm compression (primary circuit) G1 (Male) 28mm 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 tempera- ture range
Flow temperature
Heating 25 - 60°C Cooling — 5 - 25°C —
Room temperature
Heating 10 - 30 °C Cooling — NOT available —
Guaranteed oper- ating range
Ambient *1 0 - 35°C ( 80 %RH)
Outdoor temperature
Heating See outdoor unit spec table. Cooling —See outdoor unit spec table
(min. 10°C). *2 —
Electrical data
Control board
Power supply (Phase, voltage, frequency) ~/N, 230 V, 50 Hz Breaker (*when powered from independent source) 10A
Booster heater
Power supply (Phase, voltage, frequency) —~/N, 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
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
3~, 400 V,
50 Hz
Capacity — 2kW — 2kW 2kW 2kW+
4kW
2kW+
4kW
3kW+
6kW
3kW+
6kW
3kW+
6kW 2kW — 2kW 2kW 3kW+
6kW
Current — 9 A —9 A 9 A 26 A 26 A 13A 13A 23A 9 A —9 A 9 A 13A Breaker — 16 A —16 A 16 A 32 A 32 A 16A 16A 32A 16 A —16 A 16 A 16A
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 Low ambient cooling is NOT allowed. ●Remote Sensor PAC-SE41TS-E ●High temperature thermistor PAC-TH011HT-E ●Tank thermistor (THW5) (5 m) PAC-TH011TK-E ●ecodan Wi-Fi Interface PAC-WF010-E
<Table 3-1>
OCH571

7
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> (Split model system)
<EHPX-*M*C> (Packaged model system) No. Part name
EHS*-MEC EHS*-
*M*C
EHSC-
*M*EC
ERS*-
VM2C
ERSC-
MEC
EHPX-
*M*C
1 Control and electrical box
2 Main 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>
OCH571

8
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 Controller
Pressure
relief valve
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
OCH571

a
bb
d
c
9
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.
OCH571

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)
10
6WIRING DIAGRAM
6-1. EHSC-MEC, EHSD-MEC, ERSC-MEC
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
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 Table 3
X1
− 15 Relay
LED1 Power supply (FTC5)
LED2 Power supply (Main 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 <Table 3 DIP Switch Functions>.
IN2 TBI.1 11-12 — Flow switch 1 input Refer to SW2-2 in <Table 3 DIP Switch Functions>.
IN3 TBI.1 9-10 — Flow switch 2 input (Zone1) Refer to SW3-2 in <Table 3 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 <Table 3 DIP Switch Functions>.
IN7 TBI.1 1-2 — Flow switch 3 input (Zone2) Refer to SW3-3 in <Table 3 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 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 & 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)
OCH571

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)

11
6-2. EHSC-VM2C, EHSC-VM2EC, EHSD-VM2C, ERSC-VM2C, ERSD-VM2C, EHPX-VM2C
Symbol Name
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 Table 3
X1
− 15 Relay
LED1 Power supply (FTC5)
LED2 Power supply (Main 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 <Table 3 DIP Switch Functions>.
IN2 TBI.1 11-12 — Flow switch 1 input Refer to SW2-2 in <Table 3 DIP Switch Functions>.
IN3 TBI.1 9-10 — Flow switch 2 input (Zone1) Refer to SW3-2 in <Table 3 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 <Table 3 DIP Switch Functions>.
IN7 TBI.1 1-2 — Flow switch 3 input (Zone2) Refer to SW3-3 in <Table 3 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 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 & 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
OCH571

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 10A250V
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)

12
6-3. EHSC-VM6C, EHSC-VM6EC
Symbol Name
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 Table 3
X1
− 15 Relay
LED1 Power supply (FTC5)
LED2 Power supply (Main 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 <Table 3 DIP Switch Functions>.
IN2 TBI.1 11-12 — Flow switch 1 input Refer to SW2-2 in <Table 3 DIP Switch Functions>.
IN3 TBI.1 9-10 — Flow switch 2 input (Zone1) Refer to SW3-2 in <Table 3 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 <Table 3 DIP Switch Functions>.
IN7 TBI.1 1-2 — Flow switch 3 input (Zone2) Refer to SW3-3 in <Table 3 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 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 & 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
BH2 Booster heater 2
BHC1 Contactor for booster heater 1
BHC2 Contactor for booster heater 2
OCH571

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
1
3
LED1
LED2
LED3
LED4
TBI.1
1310 12 141174 65 932 81
TBI.2
1310 12 141174 65 932 81
IN6 IN1 IN2 IN3 IN4 IN5 IN7
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
3
5
7
1
*1
5
Close
Open
N
X6
X15
X12
X7
TBO.4
TBO.3
TBO.2
TBO.1
F1
F2
M
2WV2a
MXV
MP2
MP1
M
1 ~
1
3
1
3
CNV1
(WHT)
1
3CNBHT
(BLK)
CNBC
(GRY)
CNBH
(WHT)
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)
CNP4
(RED)
CNPWM
(WHT)
TBO.1
TBO.2
TBO.3
TBO.4
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
2
1
4
6
2
1
1
2
4
6
4
6
CNBH
(WHT)
CNBC
(GRY)
1
1
3
1
2
CNBHT
(BLK)
1
3
1
3
7
CNIH
(ORN)
TBI.2
126 10
14
8
137 119
4
53
2
1
6
4
2
1
CNIH
(ORN)
MP3
M
1 ~
2 2 2
ECB1
L2
(3)
L1
(1) L3 (5)
BHCP
BLK
BLK
WHT
WHTWHT
BLK
REDRED
BLU/No.4
WHT/No.2 WHT/No.3 WHT/No.1
BLU/No.5 BLU/No.6
RED
VLT VLT
PNK
PNK
WHT WHT
GRY GRY
BHC2
BHC1
BHT
642
531 A1
A2
642
531 A1
A2
BH1
BHF
BH2
24 6
Power supply
to Booster heater
642
531 A1
A2
2
2
2
2
2
1
1
3
5
7
3
1
3
3~ 400V 50Hz
IN8 IN9
IN10
1310 12 141174 65 932 81
TBI.3
TBI.3
2 4 6 8 10 12 14
1357 9 11 13
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 ~
MP4
M
1 ~
1
3
CNBHT
(BLK)
CNBC
(GRY)
CNBH
(WHT)
Signal output
(Boiler)
Signal output
(Error)
Signal output
(Defrost)
Signal output
(Comp ON)
Signal output
(Cooling)

CNP1
(WHT)
CNP4
(RED)
CNV1
(WHT)
CN3C
(BLU)
CNPWM
(WHT)
CNRF
(WHT)
CN105
(RED)
CN22
(BLU)
CNIT
(BLU)
CN01
(WHT)
–
+– +– +
CN3C
(BLU)
CN3C
(BLU)
CN01
(WHT)
CN01
(WHT)
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.
1
2
1
2
1
4
1
3
CNW5
(WHT)
CN21
(YLW)
CNW12
(RED)
CN20
(RED)
1
4
CN1A
(WHT)
M
1 ~
13
6-4. EHSC-YM9C, EHSC-YM9EC, EHPX-YM9C
Symbol Name
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.1−3 Terminal block <Signal Inputs, Thermistor>
F1 Fuse (T10AL250V)
F2 Fuse (T6.3AL250V)
SW1−5 DIP switch *See Table 3
X1−15 Relay
LED1 Power supply (FTC5)
LED2 Power supply (Main 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 <Table 3 DIP Switch Functions>.
IN2 TBI.1 11-12 — Flow switch 1 input Refer to SW2-2 in <Table 3 DIP Switch Functions>.
IN3 TBI.1 9-10 — Flow switch 2 input (Zone1) Refer to SW3-2 in <Table 3 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 <Table 3 DIP Switch Functions>.
IN7 TBI.1 1-2 — Flow switch 3 input (Zone2) Refer to SW3-3 in <Table 3 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 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 & 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
BH2 Booster heater 2
BHC1 Contactor for booster heater 1
BHC2 Contactor for booster heater 2
BHCP Contactor for booster heater protection
OCH571

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
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
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
2
1
4
6
2
1
1
2
4
6
4
6
1
1
3
1
2
1
3
1
3
7
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
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
M
1
~
CNP4
(RED)
MP4
M
1 ~
M
1 ~
1
3
1
3
5
7
X6
X7
1
3
CNBC
(GRY)
CNBH
(WHT)
Signal output
(Boiler)
Signal output
(Error)
Signal output
(Defrost)
Signal output
(Comp ON)
Signal output
(Cooling)

–
+– +– +
CNPWM
(WHT)
CNRF
(WHT)
CN105
(RED)
CN22
(BLU)
CNIT
(BLU)
CN01
(WHT)
CNP1
(WHT)
CNP4
(RED)
CNV1
(WHT)
CNBH
(WHT)
CNBC
(GRY)
CNBHT
(BLK)
CNIH
(ORN)
CN3C
(BLU)
CN3C
(BLU)
CN01
(WHT)
CN01
(WHT)
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
ECB1
L2
(3)
L1
(1) L3 (5)
BHCP
BLK
BLK
WHT
WHTWHT
BLK
REDRED
BLU/No.4
WHT/No.2 WHT/No.3 WHT/No.1
BLU/No.5 BLU/No.6
RED
VLT VLT
PNK
PNK
GRY GRY
BHC2
BHC1
BHT
642
531 A1
A2
642
531 A1
A2
BH1
BHF
BH2
246
Power supply
to Booster heater
642
531 A1
A2
2
2
2
2
2
1
1
3
5
7
3
1
3
3~ 230V 50Hz
CNBHT
(BLK)
CNBC
(GRY)
CNBH
(WHT)
WHT WHT

1
2
1
2
1
4
1
3
CNW5
(WHT)
CN21
(YLW)
CNW12
(RED)
CN20
(RED)
1
4
CN1A
(WHT)
14
6-5. EHSC-TM9C
Symbol Name
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 Table 3
X1
− 15 Relay
LED1 Power supply (FTC5)
LED2 Power supply (Main 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 <Table 3 DIP Switch Functions>.
IN2 TBI.1 11-12 — Flow switch 1 input Refer to SW2-2 in <Table 3 DIP Switch Functions>.
IN3 TBI.1 9-10 — Flow switch 2 input (Zone1) Refer to SW3-2 in <Table 3 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 <Table 3 DIP Switch Functions>.
IN7 TBI.1 1-2 — Flow switch 3 input (Zone2) Refer to SW3-3 in <Table 3 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 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 & 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
BH2 Booster heater 2
BHC1 Contactor for booster heater 1
BHC2 Contactor for booster heater 2
BHCP Contactor for booster heater protection
OCH571

15
Automatic switch to heat source only operation
Back-up heat source operation (*1) will automatically run when the outdoor unit stops abnormally. To enable the function, switch DIP SW 2-5 to ON. During the back-up operation, an er-
ror code(s) and the contact number will be displayed alternately. External output (OUT11) will be available. To clear the fault(s), reset the power breakers on the indoor and outdoor units.
<Applicable error codes (*2)>
E6 to E9, ED, P6, P8, U1 to U8, UD, UE, UF, UL, UP
(*1) Prolonged running of the back-up operation may affect the life of the heat source.
(*2) For safety reasons, this function is not available for certain faults. (System operation must be stopped and only pump keeps running.)
6-6. DIP switch setting
Located on the FTC printed circuit board are 5 sets of small white switches
known as DIP switches. The DIP switch number is printed on the circuit board
next to the relevant switches. The word ON is printed on the circuit board and on
the DIP switch block itself. To move the switch you will need to use a pin or the
corner of a thin metal ruler or similar.
DIP switch settings are listed in the table below.
Make sure to turn off both indoor unit and outdoor unit power supplies before
changing the switch settings.
DIP switch Function OFF ON Default settings:
Indoor unit model
SW1 SW1-1 Boiler WITHOUT Boiler WITH Boiler OFF
SW1-2 Heat pump maximum outlet water temperature 55ºC 60ºC ON *1
SW1-3 DHW tank WITHOUT DHW tank WITH DHW tank OFF
SW1-4 Immersion heater WITHOUT Immersion heater WITH Immersion heater OFF
SW1-5 Booster heater WITHOUT Booster heater WITH Booster heater OFF: E***-M*C
ON : E***-*M2/6/9C
SW1-6 Booster heater function For heating only For heating and DHW OFF: E***-M*C
ON : E***-*M2/6/9C
SW1-7 Outdoor unit type Split type Packaged type OFF: E*S*-*M*C
ON : EHPX-*M*C
SW1-8 Wireless remote controller WITHOUT Wireless remote controller WITH Wireless remote controller OFF
SW2 SW2-1 Room thermostat1 input (IN1) logic change
Zone1 operation stop at thermostat short Zone1 operation stop at thermostat open OFF
SW2-2 Flow switch1 input (IN2) logic change Failure detection at short Failure detection at open OFF
SW2-3 Booster heater capacity restriction Inactive Active OFF: Except E***-VM2*C
ON : E***-VM2*C
SW2-4 Cooling mode function Inactive Active OFF: Except ERS*-*M**C
ON : ERS*-*M**C
SW2-5 Automatic switch to backup heat source operation
(When outdoor unit stops by error) Inactive Active *2 OFF
SW2-6 Mixing tank WITHOUT Mixing tank WITH Mixing tank OFF
SW2-7 2-zone temperature control Inactive Active *6 OFF
SW2-8 Flow sensor WITHOUT Flow sensor WITH Flow sensor ON
SW3 SW3-1 Room thermostat 2 input (IN6) logic change Zone2 operation stop at thermostat short Zone2 operation stop at thermostat open OFF
SW3-2 Flow switch 2 input (IN3) logic change Failure detection at short Failure detection at open OFF
SW3-3 Flow switch 3 input (IN7) logic change Failure detection at short Failure detection at open OFF
SW3-4 Electric energy meter WITHOUT Electric energy meter WITH Electric energy meter OFF
SW3-5 Heating mode function *3 Inactive Active ON
SW3-6 2-zone valve ON/OFF control Inactive Active OFF
SW3-7 Heat exchanger for DHW Coil in tank External plate HEX OFF
SW3-8 Heat meter WITHOUT Heat meter WITH Heat meter OFF
SW4 SW4-1 Multiple outdoor units control Inactive Active OFF
SW4-2 Position of multiple outdoor units control *7 Slave Master OFF
SW4-3 — — — OFF
SW4-4
Indoor unit only operation (during installation work) *4 Inactive Active OFF
SW4-5 Emergency mode (Heater only operation) Normal
Emergency mode (Heater only operation) OFF *5
SW4-6 Emergency mode (Boiler operation) Normal Emergency mode (Boiler operation) OFF *5
SW5 SW5-1
DHW tank water temperature over heat protection (L4) Active Inactive *8 OFF
SW5-2 — — — OFF
SW5-3
SW5-4
SW5-5
SW5-6
SW5-7
SW5-8 — — — OFF
Note:
*1. When the hydrobox is connected with a PUHZ-RP/SUHZ-SW outdoor unit of which maximum outlet water temperature is 55ºC, DIP SW1-2 must be changed to OFF.
*2.
OUT11 will be available. For safety reasons, this function is not available for certain errors. (In that case, system operation must be stopped and only the water circulation pump keeps running.)
*3 This switch functions only when the hydrobox is connected with a PUHZ-FRP outdoor unit. When another type of outdoor unit is connected, the heating mode function is active
regardless of the fact that this switch is ON or OFF.
*4. Space heating and DHW can be operated only in indoor unit, like an electric boiler. (Refer to “Indoor unit only operation” in page 40. )
*5. If emergency mode is no longer required, return the switch to OFF position.
*6. Active only when SW3-6 is set to OFF.
*7. Active only when SW4-1 is set to ON.
*8.
Please make sure to have necessary overheat protection on locally supplied solar thermal system side to secure safety, as the tank temperature coulld be much higher (than current).
SW1
SW3
SW4
SW2
SW5
SW5-3 SW5-4 SW5-5 SW5-6 SW5-7
E*SC-*M*C ON ON ON ON OFF
E*SD-*M*C ON OFF OFF ON OFF
EHPX-*M*C OFF OFF OFF OFF OFF
Capacity code
OCH571

L
N
S1
S2
S3
S1
S2
S3
TB1
L
N
ECB1
L
N
L1
L2
S1
S2
S3
S1
S2
S3
TB1
L2
L3
ECB1
N
L3
L1
L2
L1
16
FIELD WIRING
7
Breaker abbreviation Meaning
ECB1 Earth leakage circuit breaker for booster heater
TB1 Terminal block 1
Earth
leakage
circuit
breaker
*1
Outdoor unit
Power
supply ~/
N
230 V
50 Hz
Wiring
circuit
breaker or
Isolating
switch
To control
board
For
booster
heater
(Primary circuit)
Hydrobox
Wiring
circuit
breaker or
Isolating
switch
Power
supply
~/N
230 V
50 Hz
Earth
leakage
circuit
breaker
*1
Outdoor unit
Power supply
3~ 400 V 50 Hz (EH**-YM9(E)C)
3~ 230 V 50 Hz (EHSC-TM9C)
Wiring
circuit
breaker or
Isolating
switch
To control
board
For
booster
heater
(Primary circuit)
Hydrobox
Wiring
circuit
breaker or
Isolating
switch
Power
supply
3N~
400 V
50 Hz
Option 1: Hydrobox powered via outdoor unit
<1 phase>
<Figure 7-1>
Electrical connections 1 phase
Description Power supply Capacity Breaker Wiring
Booster heater
(Primary circuit)
~/N 230 V
50 Hz
2 kW 16 A *1 2.5 mm²
6 kW 32 A *1 6.0 mm²
*1 If the installed earth leakage circuit breaker does
not have an over-current protection function, install a
breaker with that function along the same power line.
<3 phase>
<Figure 7-2>
Electrical connections 3 phase
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 *3 230 V AC
Hydrobox - Outdoor unit S2 - S3 *3 24 V DC
*1. A breaker with at least 3.0 mm contact separation in each pole shall be provided. Use earth leakage breaker (NV).
The breaker shall be provided to ensure disconnection of all active phase conductors of the supply.
*2. Max. 45 m
If 2.5 mm² used, Max. 50 m
If 2.5 mm² used and S3 separated, Max. 80 m
*3. The values given in the table above are not always measured against the ground value.
Notes: 1. Wiring size must comply with the applicable local and national codes.
2.Indoorunit/outdoorunitconnectingcordsshallnotbelighterthanpolychloroprenesheathedexiblecord.(Design60245IEC57)
Indoorunitpowersupplycordsshallnotbelighterthanpolychloroprenesheathedexiblecord.(Design60227IEC53)
3. Install an earth longer than other cables.
4.Pleasekeepenoughoutputcapacityofpowersupplyforeachheater.Insufcientpowersupplycapacitymightcausechattering.
*1 If the installed earth leakage circuit breaker does
not have an over-current protection function, install
a breaker with that function along the same power
line.
Afx label A that is included with the manuals near each wiring diagram for hydrobox and outdoor units.
Afx label A that is included with the manuals near each wiring diagram for hydrobox and outdoor units.
Description Power supply Capacity Breaker Wiring
Booster heater
(Primary circuit)
3~ 400 V
50 Hz 9 kW 16 A *1 2.5 mm²
3~ 230 V
50 Hz 9 kW 32 A *1 6.0 mm²
OCH571

S1
S2
S3
L
N
L
N
CN01
CN01
CN01
CN01
S1
S2
S3
L
N
S1
S2
S3
S1
S2
S3
TB1
L
N
ECB1
L
N
L1
L2
S1
S2
S3
S1
S2
S3
TB1
L2
L3
ECB1
N
L3
L1
L
N
17
For
booster
heater
(Primary circuit)
To control
board
Outdoor unit
Wiring
circuit
breaker or
Isolating
switch
Earth
leakage
circuit
breaker
*1
Power
supply ~/
N
230 V
50 Hz
Power
supply ~/
N
230 V
50 Hz
Earth
leakage
circuit
breaker
*1
Wiring
circuit
breaker or
Isolating
switch
Wiring
circuit
breaker or
Isolating
switch
Power
supply ~/
N
230V
50Hz
Hydrobox
Initial settings
(Power supplied
by outdoor unit)
Modied settings
(Separate power
supply to
the hydrobox)
BLACK BLACK YELLOW
BLACK
YELLOW YELLOW
YELLOW BLACK
Hydrobox
control board
White
White
Earth
leakage
circuit
breaker
*1
Outdoor unit
Power
supply
3N~
400 V
50 Hz
Wiring
circuit
breaker or
Isolating
switch
To control
board
For
booster
heater
(Primary circuit)
Hydrobox
Wiring
circuit
breaker or
Isolating
switch
Power
supply ~/
N
230 V
50 Hz
Earth
leakage
circuit
breaker
*1
Wiring
circuit
breaker or
Isolating
switch
Power supply
3~ 400 V 50 Hz (EH**-YM9(E)C)
3~ 230 V 50 Hz (EHSC-TM9C)
Hydrobox
control board
Option2: Hydrobox powered by independent source
If the hydrobox and outdoor units have separate power supplies, the following requirements
MUST be carried out:
•Changeconnectorconnectionsinhydroboxcontrolandelectricalbox(seeFigure7-3).
•TurntheoutdoorunitDIPswitchSW8-3toON.
•TurnontheoutdoorunitBEFOREthehydrobox.
•Powerbyindependentsourceis not availableforparticularmodelsof outdoor unit
model.
For more detail, refer to the connecting outdoor unit installation manual.
<1 phase>
<Figure 7-4>
Electrical connections 1 phase
<Figure 7-3>
*1 If the installed earth leakage circuit breaker does
not have an over-current protection function, install a
breaker with that function along the same power line.
<3 phase>
<Figure 7-5>
Electrical connections 3 phase
Hydrobox power supply ~/N 230 V 50 Hz
Hydrobox input capacity
Main switch (Breaker)
*1 16 A
Wiring
Wiring No.
× size (mm²)
Hydrobox power supply 2 × Min. 1.5
Hydrobox power supply earth 1 × Min. 1.5
Hydrobox - Outdoor unit *2 2 × Min. 0.3
Hydrobox - Outdoor unit earth —
Circuit
rating
Hydrobox L - N *3 230 V AC
Hydrobox - Outdoor unit S1 - S2 *3 —
Hydrobox - Outdoor unit S2 - S3 *3 24 V DC
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exiblecord.(Design60245IEC57)
Indoorunitpowersupplycordsshallnotbelighterthanpolychloroprenesheathedexiblecord.(Design60227IEC53)
3. Install an earth longer than other cables.
4.Pleasekeepenoughoutputcapacityofpowersupplyforeachheater.Insufcientpowersupplycapacitymightcausechattering.
*1 If the installed earth leakage circuit breaker does not
have an over-current protection function, install a breaker
with that function along the same power line.
*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.
Afx label B that is included with the manuals near
each wiring diagram for hydrobox and outdoor units.
Afx label B that is included with the manuals near
each wiring diagram for hydrobox and outdoor units.
Description Power supply Capacity Breaker Wiring
Booster heater
(Primary circuit)
3~ 400 V
50 Hz 9 kW 16 A *1 2.5 mm²
3~ 230 V
50 Hz 9 kW 32 A *1 6.0 mm²
Description Power supply Capacity Breaker Wiring
Booster heater
(Primary circuit)
~/N 230 V
50 Hz
2 kW 16 A *1 2.5 mm²
6 kW 32 A *1 6.0 mm²
OCH571

Pa
18
22
25
23
24
*1
26
7
6
5
8
9
10
11 12
13
15
16
20
21
27
3
19 26
28
28
4
25
26
26
Pa
18
19
22
25
23
24
5
3
17
9
10
11 12
13
15
16
20
27
46
7
8
*1
25
26
26
21
18
WATER SYSTEM DIAGRAM
8
<Figure 8-1>
<Figure 8-2>
Note
• Be sure to follow your local regulations to per-
form system conguration of the DHW connec-
tions.
• DHW connections are not included in the hy-
drobox package. All required parts are to be
sourced locally.
• To enable draining of the hydrobox an isolating
valve should be positioned on both the inlet and
outlet pipework.
• Be sure to install a strainer on the inlet pipe
work to the hydrobox.
• Suitable drain pipework should be attached to
all relief valves in accordance with your coun-
try's regulations.
• A backow prevention device must be installed
on water supply pipework (IEC 61770).
• When using components made from different
metals or connecting pipes made of different
metals insulate the joints to prevent a corrosive
reaction taking place which will damage the
pipework.
<EHS*> (Split model system)
<ERS*> (Split model system for heating and cooling)
<EHPX> (Packaged model system)
Local
system
Refrigerant pipe
Water
supply
Water
supply
DHW
DHW
Drain
Drain
Drain
Drain
Cold
water
Cold
water
Water pipe
Water pipe
Hydrobox
Hydrobox
Flare connections
Local
system
No. Part name
EHS*-
MEC
EHS*-
*M*C
EHSC-
*M*EC
ERS*-
VM2C
ERSC-
MEC
EHPX-
*M*C
1 Control and electrical box
2 Main 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 (3 bar)
11 Automatic air vent
12 Expansion vessel ---
13 Strainer valve
14 Drain pan - - - -
15 THW1
16 THW2
17 TH2 -
18
THW5
(Optional part PAC-
TH011TK-E or PAC-
TH011TKL-E)
------
19 Outdoor unit ------
20 Drain pipe (Local supply) ------
21 3-way valve (Local supply) ------
22 DHW indirect unvented
tank (Local supply)
------
23 Cold water inlet pipe
(Local supply)
------
24 DHW outlet pipe
(Local supply)
------
25 Back ow prevention
device (Local supply)
------
26 Isolating valve
(Local supply)
------
27
Magnetic lter
(Local supply)
(Recommended)
------
28 Strainer (Local supply) ------
<Table 8-1>
*1 Refer to the following section [Local system].
OCH571

19
1-zone temperature control
2-zone temperature control 1-zone temperature control with boiler
2-zone temperature control with boiler
1-zone temperature control (2-zone valve ON/OFF control)
Local system
3
7
5
2
4
6
8
911
11
1
12
10
11
Zone1
Zone2
1
2
3
5
6
4
Zone1
1
5
4
3
6
2
13
14
15
Zone1
2
13
14
15
7
5
4
3
61
8
9
10
11
12
Zone1
Zone2
* Flow switch specications: DC12 V / 1 mA / Both normally-open and normally-closed types can be used. (Set DIP switch 3 to select the logics. Refer to “ 6-6 DIP switch setting”.)
1. Zone1 heat emitters (e.g. radiator, fan coil unit) (local supply)
2. Mixing tank (local supply)
3. Zone1 ow water temp. thermistor (THW6)
4. Zone1 return water temp. thermistor (THW7)
5. Zone1 water circulation pump (local supply)
6. Zone1 ow switch (local supply) *
7. Motorized mixing valve (local supply)
8. Zone2 ow water temp. thermistor (THW8)
9. Zone2 return water temp. thermistor (THW9)
Optional part :
PAC-TH011-E
Optional part :
PAC-TH011-E
10. Zone2 water circulation pump (local supply)
11. Zone2 ow switch (local supply) *
12. Zone2 heat emitters (e.g. underoor heating) (local supply)
13. Boiler ow water temp. thermistor (THWB1)
14. Boiler return water temp. thermistor (THWB2)
15. Boiler
16. Zone1 2-way valve (local supply)
17. Zone2 2-way valve (local supply)
18. Bypass valve (local supply)
Optional part :
PAC-TH011HT-E
1
Zone1
16
18
Zone1
Zone2
17
OCH571

20
1. Check all connections including factory tted ones are tight.
2. Insulate pipe work between hydrobox and outdoor unit.
3. Thoroughly clean and ush, system of all debris. (Refer to 4.2 in the installation manual.)
4. Fill primary heating circuit with water and suitable anti-freeze and inhibitor as necessary. Alwaysuseallingloopwithdoublecheckvalvewhenllingthe
primarycircuittoavoidback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 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.)
OCH571