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17
5.4.2 Piping Connection
(1)
Make sure that the stop valves are closed completely.
(2) Protect the compressor and sound-proof cover with metal plate when brazing the gas pipe as shown in Fig. 5.2. Pay
attention to the flame from the burner not to burn the stop valve body.
(3) Connect the indoor unit and the outdoor unit with refrigerant piping. Prevent the refrigerant piping from touching
weak parts of the building such as wall, ceiling, etc. Abnormal sound may give off due to vibration of the piping.
(4) As for the flaring work of the field pipe, use the specified tightening torque in Table 5.3. Purge nitrogen gas into the
pipe when brazing.
(5) Insulate the gas pipe and liquid pipe completely.
(6) Mount the piping cover equipped with the outdoor unit after the piping connection. If not, the unit may be damaged
due to the ingress of snow or rain water.
Table 5.3 Flare Nut Tightening Work
Required Tightening Torque
Pipe Size
Tightening Torque (ft·lbs(N·m))
Φ6.35 (1/4)
10~13(1418)
Φ9.53 (3/8)
25~31(3442)
Φ12.7 (1/2) 50~62(68~84)
Φ15.88 (5/8) 63~77(85~104)
Φ19.05 (3/4) 90~110(122~149)
NOTES:
< Front Side Piping Connection >
< Downward Piping Connection >
1. Ensure that the closing pipe of the gas stop valve(1 place) is removed firstly.
2. Refer to the item 5.2 for flaring work.
Construction Example
< Heat Pump System >
NOTE:
Min.19-11/16in.
(500mm)
Outdoor unit A
Outdoor unit B
Outdoor unit C
High/Low pressure Gas Piping
(Field-Supplied)
Liquid Piping
(Field-Supplied)
Manifold Pipe 1
(Liquid)
Bending Pipe
(Field-Supplied)
Manifold Pipe 2
(High/Low Pressure Gas)
Manifold Pipe 2(Liquid)
Liquid Piping
(Field-Supplied)
High/Low pressure
Gas Piping(Field-Supplied)
Outdoor unit B
Outdoor unit C
Outdoor unit A
High/Low pressure Gas Piping
(Field-Supplied)
Liquid Piping
(Field-Supplied)
Bending Pipe
(Field-Supplied)
Liquid Piping
(Field-Supplied)
High/Low pressure
Gas Piping(Field-Supplied)
High/Low pressure
Gas Piping(Field-Supplied)
Liquid Piping
(Field-Supplied)
(Field-Supplied)
Bending Pipe
Manifold Pipe 2(Liquid)
Manifold Pipe 2(Liquid)
This piping connection is NOT
used in heat pump system
(2-pipe)
There are three piping connections in the outdoor
units
In case of heat pump system, there are only two
piping connections.
Manifold Pipe 2
(High/Low pressure Gas)
Manifold Pipe 1
(High/Low pressure Gas)
Accessory Piping
(Field-Supplied)
Accessory Piping
(Field-Supplied)
Manifold Pipe 1
(High/Low pressure Gas)
<View-P>
High/Low Pressure
Gas Piping
Liquid Piping
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