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49 

* note:  - Two-way Valve shall be CE marking compliance component. 
            - Maximum load for the valve is 9.8 VA. 

5  Three-Way Valve shall be spring and electronic type. Valve's cable shall be (3 × min 0.5 mm

2

), of type 

designation 60245 IEC 57 or heavier, or similarly double insulation sheathed cable. 
* note:  - Shall be CE marking compliance component. 
            - It shall be directed to heating mode when it is OFF. 
            - Maximum load for the valve is 9.8 VA. 

6  Room Thermostat cable must be (4 or 3 × min 0.5 mm

2

), double insulation layer of PVC-sheathed or rubber-

sheathed cable. 

7  Tank OLP cable must be (2 × min 0.5 mm

2

), double insulation layer of PVC-sheathed or rubber-sheathed 

cable. 
* note:  - if such connection deemed NO necessary for tank OLP, please connect jumper between terminal 
  

  no. 13 and 14. 

8  Tank Sensor shall be resistance type, please refer to Graph 5.1 for the characteristic and details of sensor. 

Its cable shall be (2 × min 0.3 mm

2

), double insulation layer (with insulation strength of min 30 V) of PVC-

sheathed or rubber-sheathed cable. 

9  External Controller shall be connected to 1-pole switch with min 3.0mm contact gap. (connection refer to 

Diagram 5.2). Its cable must be (2 × min 0.5 mm

2

), double insulation layer of PVC-sheathed or rubber-

sheathed cable. 
* note:  - When making such connection, kindly remove the jumper between terminal no. 17 and 18. 
            - Switch used shall be CE compliance component. 
            - Maximum operating current shall be less than 3A

rms

. 

10  Must install Solar Connection PCB   (optional) to indoor unit when Solar Pump Station is utilized. Refer 

Solar Connection PCB’s installation instruction for detail of installation. 

11  Solar Three-way Valve cable shall be (3 × min 0.5 mm

2

), double insulation layer PVC-sheathed or rubber-

sheathed cable. 

12  Solar Pump Station cable shall be (2 × min 0.5 mm

2

), of double insulation PVC-sheathed or rubber-sheathed 

cable. Strongly recommended install with maximum length of 10 meter only. 

 

Tank

OLP

Cable

Terminals on the indoor

Lead wire cord

1

2

3

4

5

6

Three-way

Valve Cable

Two-way

Valve Cable

Solar Pump

Station Cable

External

Controller

Cable

7

8

9 10 11 12

13 14 15 16 17 18

19 20 21

22 23

Booster Heater

Cord

Room Thermostat

Cable

Solar Three-way

Valve Cable

Only if Solar Connection PCB installed

Tank

Sensor

Cable

HEAT

C

OOL

N

N

L

L

N

N

O

PEN

O

PEN

CL
O

S

E

CL
O

S

E

N

CL
O

S

E

O

PEN

 

 

LN11

N

L

N

L 22

P OWER SUP PLY 2

L B1

L B2

L B3

N

P OWER SUP PLY 1

L A1

L A2

L A3

N

45

A

How to guide the lead wires and power supply cord

(view without internal wiring)

Bind all optional

cables and cords

with this band
Power Supply 2

RCCB/ELCB

Earth wire must be longer than other

cables for safety reasons.

Bind all optional cables and cords with this band
Holder (Clamper)

Power Supply 1

3 phase RCCB

Power Supply 2

3 phase RCCB

Earth wire must

be longer than

other cables for

safety reasons.

Indoor unit bottom

Holder

(Clamper)

Power

Supply 2

Power

Supply 1

Power

Supply 2

Connecting

cables

Bushing

Indoor terminal for

connecting cables

(Only applicable for model

WH-SDC09F3E8)

(Only applicable for model

WH-SDC12F9E8)

 

50 

Solar Three-way Valve

Cable (Optional)
External Control Cable

(Optional)
Tank Sensor Cable

(Optional)
Tank OLP Cable (Optional)

Detail A

Solar Pump Station Cable

(Optional)

Three-way Valve Cable

(Optional)
Two-way Valve Cable

(Optional)

Earth wire must be longer

than other cables for safety

reasons.

Room Thermostat Cable

(Optional)
Booster Heater Cord

(Optional)

 

 

-30

-10

0

10

20

30

-20

16000
14000
12000
10000

8000

˚C

6000
4000
2000

0

Graph 5.1: Tank sensor characteristic

Tank Sensor Resistance Vs Temperature

Re

sist

a

n

ce

 (

kΩ

)

Wire stripping

5mm or

more

(gap between

wires)

No loose strand

when insert

Indoor/outdoor

connecting

terminal board

1

0

 ±

 1

m

m

ACCEPT

PROHIBITED

Conductor
over insert

Conductor not

fully insert

Conductor

fully insert

PROHIBITED

17
18

Diagram 5.2: External Controller connecting

diagram

External Controller

Terminal

Switch (ON/OFF)

Remove this
jumper if External
Controller
(Optional) is
connected to the
indoor unit

 

  The equipment’s power supply 1 complies with IEC/EN 61000-3-2. 

  The equipment’s power supply 2 complies with IEC/EN 61000-3-2. 
 
For model WH-SDC12F9E8 

  The equipment’s power supply 1 complies with IEC/EN 61000-3-2. 

  The equipment’s power supply 2 complies with IEC/EN 61000-3-2. 

  The equipment’s power supply 2 shall be connected to a suitable supply network, with the following maximum 

permissible system impedance Z

max

 at the interface of the point: 0.449 Ω. Please liaise with supply authority to 

ensure that power supply 2 is connected to a supply of the impedance or less.

51 

  After selecting the best location, start installation 

according to Indoor/Outdoor Unit Installation 
Diagram. 
1  Fix the unit on concrete or rigid frame firmly 

and horizontally by bolt nut (ø10 mm). 

2  When installing at roof, please consider strong 

wind and earthquake. Please fasten the 
installation stand firmly with bolt or nails. 
 
(Unit in mm) 

140

355

44

620

140

20

2

5

450

(A

nc

hor

 p

itc

h

)

(Anchor pitch)

 

Model 

Piping size (Torque) 

Gas 

Liquid 

WH-SDC09F3E8 

WH-UD09FE8 

ø15.88 mm 

(5/8") 

[65 N•m] 

ø9.52 mm 

(3/8") 

[42 N•m] 

WH-SDC12F9E8 

WH-UD12FE8 

 
Connecting The Piping To Outdoor Unit 
 
Decide piping length and then cut by using pipe cutter. 
Remove burrs from cut edge. Make flare after 
inserting the flare nut (locate at valve) onto the copper 
pipe. 
Align center of piping to valves and then tighten with 
torque wrench to the specified torque as stated in the 
table. 
 
Local pipes can project in any of four directions. 

  Make holes in the pipe panels for the pipes to 

pass through. 

  Be sure to install the pipe panels to prevent rain 

from getting inside the outdoor unit. 
[Removing the service panel]. 
1  Remove the three mounting screws. 
2  Slide the service panel downward to release 

the pawls. 

After this, pull the service panel toward you to remove 
it. 
 

Do not over tighten, over tightening cause gas leakage. 

 
 

Front pipe panel

Rear pipe

panel

Mounting

screws

Service panel

Rear direction

Side panel

Downward

direction

Forward

direction

 

 
 
 
 
 
 

 

Close the tube joining area

with putty heat insulator

(local supply) without any

gap as shown in right figure.

(To prevent insects or small

animal entering.)

Be sure to use two spanners

to tighten.

(If the nuts are over

tightened, it may cause

the flares to break

or leak.)

Do not attach
the spanners
here

Putty or Heat

insulator

(local supply)

 

 
 
 
 
 
 
 
 
 

52 

1  Please cut using pipe cutter and then remove the burrs. 
2  Remove the burrs by using reamer. If burrs is not removed, gas leakage may be caused. 

Turn the piping end down to avoid the metal powder entering the pipe. 

3  Please make flare after inserting the flare nut onto the copper pipes. 

When properly flared, the internal surface of the flare
will evenly shine and be of even thickness. Since the
flare part comes into contact with the connections,
carefully check the flare finish.

Bar

0 – 0.5 mm

Copper pipe

3. To flare

Bar

Red arrow mark

Handle

Core

Yoke

Clamp handle

Reamer

2. To remove burrs

Point down

Pipe

1. To cut



Improper flaring

Inclined

damaged

Cracked

Surface

Uneven

thickness

WHEN INSTALLING AN AIR-TO-WATER HEAT PUMP, BE SURE TO EVACUATE THE AIR INSIDE THE INDOOR 
UNIT AND PIPES in the following procedure. 

 

Lo

Hi

Vacuum

pump

adaptor

Vacuum

pump

OPEN

CLOSE

Close

Gas side

Liquid side

Outdoor unit

Three-way valve

Two-way valve

Close

Indoor unit

 

 

1  Connect a charging hose with a push pin to the Low side of a charging set and the service port of the 3-way 

valve. 

o

 

Be sure to connect the end of the charging hose with the push pin to the service port. 

2  Connect the center hose of the charging set to a vacuum pump with check valve, or vacuum pump and 

vacuum pump adaptor. 

3  Turn on the power switch of the vacuum pump and make sure that the needle in the gauge moves from 

0 cmHg (0 MPa) to –76 cmHg (–0.1 MPa). Then evacuate the air approximately ten minutes. 

4  Close the Low side valve of the charging set and turn off the vacuum pump. Make sure that the needle in the 

gauge does not move after approximately five minutes. 
Note: BE SURE TO FOLLOW THIS PROCEDURE IN ORDER TO AVOID REFRIGERANT GAS LEAKAGE. 

5  Disconnect the charging hose from the vacuum pump and from the service port of the 3-way valve. 
6  Tighten the service port caps of the 3-way valve at a torque of 18 N•m with a torque wrench. 
7  Remove the valve caps of both of the 2-way valve and 3-way valve. Position both of the valves to “OPEN” 

using a hexagonal wrench (4 mm). 

8  Mount valve caps onto the 2-way valve and the 3-way valve. 

o

 

• Be sure to check for gas leakage. 

 

 

If gauge needle does not move from 0 cmHg (0 MPa) to –76 cmHg (–0.1 MPa), in step   above take the following measure: 

  If the leak stops when the piping connections are tightened further, continue working from step  . 

  If the leak does not stop when the connections are retightened, repair the location of leak. 
  Do not release refrigerant during piping work for installation and reinstallation. Take care of the liquid refrigerant, it may cause 

frostbite.