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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. 

 

 CAUTION 

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 location of leak. 

  Do not release refrigerant during piping work for installation and reinstallation. Take care of the liquid refrigerant, it may cause 

frostbite. 

42 

(FOR DETAIL REFER TO WIRING DIAGRAM AT UNIT) 

1  Remove the control board cover from the unit by loosening the screw. 
2  Connecting cable between indoor unit and outdoor unit shall be approved polychloroprene sheathed 4 × (4.0 

or 6.0 mm

2

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

 

Outdoor unit

Terminals on the indoor unit

1

2

3

1

2

3

Colour of wires

Terminals on the outdoor unit

 

 

3  Secure the cable onto the control board with the holder (clamper). 
4  Select required direction and apply protective bushing provided in accessories to protect cables from sharp 

edges. 

5  Once all wiring work has been completed, tie the cables and cord together with the binding strap so that they 

do not touch other parts such as the compressor and bare copper pipes. 

6  Install back the control board cover. 
 

Outdoor Unit

Banding strap
(Field Supply)

Cord clamp

Indoor/outdoor unit
terminal board

Connecting
cable (refer below
diagram for its
guiding)

 

 

  Same as indoor requirement. For details please refer the diagram on AIR-TO-WATER HEATPUMP INDOOR 

UNIT, section 11.3.4 (CONNECT THE CABLE TO THE INDOOR UNIT). 

 

Selection of
direction

Protective bushing 6

Apply cut

DETAIL OF CONNECTING CABLE GUIDING

 

1  Please carry out insulation at pipe connection portion as mentioned in Indoor/Outdoor Unit Installation 

Diagram. Please wrap the insulated piping end to prevent water from going inside the piping. 

2  If drain hose or connecting piping is in the room (where dew may form), please increase the insulation by 

using POLY-E FOAM with thickness 6 mm or above. 

 
 
 
 
 
 

43 

  When a Drain elbow   is used, please ensure to follow below: 

o

  the unit should be placed on a stand which is taller than 50 mm. 

o

  cover the 8 holes (ø20 mm) with Rubber cap   (refer to illustration below). 

o

  use a tray (field supply) when necessary to dispose the outdoor unit drain water. 

 

Rubber cap

Drain elbow

× 8

2

5

 

 

  If the unit is used in an area where temperature falls below 0°C for 2 or 3 consecutive days, it is recommended 

not to use the Drain elbow   and Rubber cap  , for the drain water freezes and the fan will not rotate. 

 

 

 
 
 
 
 
 
 

44 

Inverter control, which equipped with a microcomputer in determining the most suitable operating mode as time 
passes, automatically adjusts output power for maximum comfort always. In order to achieve the suitable operating 
mode, the microcomputer maintains the set temperature by measuring the temperature of the environment and 
performing temperature shifting. The compressor at outdoor unit is operating following the frequency instructed by 
the microcomputer at indoor unit that judging the condition according to internal water setting temperature and water 
outlet temperature. 

Once the operation starts, control panel setting temperature will be taken as base value for temperature shifting 
processes. These shifting processes are depending on the Air-to-Water Heat pump settings and the operation 
environment. The final shifted value will be used as internal water setting temperature and it is updated continuously 
whenever the electrical power is supplied to the unit. 

  Compressor is OFF when Water Outlet Temperature – Internal Water Setting Temperature > 2°C for 

continuously 3 minutes. 

  Compressor is ON after waiting for 3 minutes, if the Water Outlet Temperature – Water Inlet Temperature 

(temperature at thermostat OFF is triggered) <-3°C. 

Stops provide heating to room side during high outdoor ambient condition. 
Control content: 

  Heating operation and water pump will turn OFF when outdoor ambient temperature > outdoor thermo off 

temperature + 3°C. 
(Outdoor thermo off set temperature is set by control panel. Thermo off set temperature is between 5°C ~ 35°C) 

  Heating operation will resume when Outdoor ambient temperature < Outdoor thermo OFF set temperature + 1°C. 

Operation of heat pump provide heating capacity to room side by hot water through heating panel, floor heating or 
fan coil unit. 

1  3 ways valve control: 

o

 

3 ways valve switch and fix to heating side. 

2  Heat pump operates follow normal heating operation. 
3  Back up heater operate follow normal operation. 
4  Solar 3 way valve operates follow solar operation specification. 
5  2 ways valve control: 

o

 

2 ways valve opens.