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37 

  Fix the drain elbow   and packing   to the bottom 

of indoor unit, as shown in below illustration. 

  Use inner diameter 17 mm drain hose in the 

market. 

  This hose must to be installed in a continuously 

downward direction and in a frost-free 
environment. 

  Guides this hose’s outlet to outdoor only. 

  Do not insert this hose into sewage or drain pipe 

that may generate ammonia gas, sulfuric gas, etc. 

  If necessary, use hose clamp to further tighten the 

hose at drain hose connector to prevent leakage. 

  Water will drip from this hose, therefore the outlet 

of this hose must be installed in an area where the 
outlet cannot become blocked. 

 

Water Connector

Packing 9

Drain Elbow 10

 

1  Connecting cable between indoor unit and outdoor unit shall be approved polychloroprene sheathed 4 × min 

4.0 or 6.0 mm

2

 flexible cord, type designation 60245 IEC 57 or heavier cord. 

o

 

Ensure the colour of wires of outdoor unit and the terminal no. are the same to the indoor unit’s 
respectively. 

o

 

Earth wire shall be longer than the other wires as shown in the figure for the electrical safety in case of 
the slipping out of the cord from the Holder (Clamper). 

2  An isolating device must be connected to the power supply cable. 

o

 

Isolating device (Disconnecting means) should have minimum 3.0 mm contact gap. 

o

 

Connect the approved polychloroprene sheathed power supply 1 cord (3 × min 4.0 or 6.0 mm

2

) and 

power supply 2 cord (3 × min 4.0 mm

2

), type designation 60245 IEC 57 or heavier cord to the terminal 

board, and to the other end of the cord to isolating device (Disconnecting means). 

3  To avoid the cable and cord being damaged by sharp edges, the cable and cord must be passed through a 

bushing (located at the bottom of indoor unit) before being connected to the terminal block. The bushing must 
be used and must not be removed. 

 

Indoor unit/

Outdoor unit connection

1

2

3

2

3

1

L

N

N

L

Power Supply 1

Terminal on the outdoor unit
Colour of wires (Connecting cables)
Terminal on the indoor unit
(Power Supply Cord)
Terminals on the isolating device from

power supply (Disconnecting means)

L

1

N

1

L

1

N

1

Power Supply 2

 

 
Connecting with external device (optional) 

1  All connections shall follow to the local national wiring standard. 
2  It is strongly recommended to use manufacturer-recommended parts and accessories for installation. 
3  Maximum output power of booster heater should be ≤ 3 kW. Booster Heater cord must be (3 × min 1.5 mm

2

), 

of type designation 60245 IEC 57 or heavier. 

4  Two-way Valve shall be spring and electronic type, refer to “Field Supply Accessories” table for details. Valve 

cable shall be (3 × min 0.5 mm

2

), of type designation 60245 IEC 57 or heavier, or similarly double insulation 

sheathed cable. 
* 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. 

38 

9  External Controller shall be connected to 1-pole switch with min 3.0 mm 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

23

22

24

Booster Heater

Cord

Room Thermostat

Cable

Solar Three-way

Valve Cable

Only if Solar Connection PCB installed

Tank

Sensor

Cable

H

EAT

CO
O

L

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

 

 

A

LN11

N

L 11

How to guide the lead wires and power supply cord

(view without internal wiring)

Bind all optional

cables and cords

with this band

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

RCCB/ELCB

Power Supply 2

RCCB/ELCB

Earth wire must

be longer than

other cables for

safety reasons.

Indoor unit bottom

Holder (Clamper)

Power

Supply 2

Power

Supply 1

Connecting

cables

Bushing

Indoor terminal for

connecting cables

  

39 

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

R

e

si

sta

n

ce

 (

Ω)

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 61000-3-12 provided that the short-circuit power S

sc

 is 

greater than or equal to 850 kW (for WH-SDC07/09F3E5/UD07/09FE5) at the interface point between the user’s 
supply and the public system. It is the responsibility of the installer or user of the equipment to ensure, by 
consultation with the distribution network operator if necessary, that the equipment is connected only to a supply 
with a short-circuit power S

sc

 greater than or equal to 850 kW. 

  The equipment's power supply 1 shall be connected to a suitable supply network, having service current capacity 

≥ 100A per phase. Please liaise with supply authority to ensure that the service current capacity at the interface 
point is sufficient for the installation of the equipment. 

  The equipment’s power supply 2 complies with IEC/EN 61000-3-12. 

  The equipment’s power supply 2 shall be connected to a suitable supply network, having service current capacity 

≥ 100A per phase. Please liaise with supply authority to ensure that the service current capacity at the interface 
point is sufficient for the installation of the equipment.

40 

  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-SDC07/09F3E5 

WH-UD07/09FE5 

ø15.88 mm 

(5/8") 

[65 N•m] 

Ø6.35 mm 

(1/4") 

[18 N•m] 

 
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

Forward

direction

Downward

direction

Side panel

Rear 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)