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6.4.5 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. 6.2.
Pay attention to the flame from the burner not to burn the stop valve bod .
(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 occur due to the vibration of the piping.)
(4) As for the flaring work of the field pipe, use the spec ed tightening torque in Table 6.3.
Put 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 damaged due to snow or rain water entering.
Table. 6.3 Tightening Work of Flare Nut
Required Tightening Torque
Pipe Size
6.35
(1/4)
9.53
(3/8)
12.7
(1/2)
15.88 (5/8)
19.05 (3/4)
● Details of Stop Valve Piping Connection
76
Stop Valve
Elbow
(Field-Supplied)
114
Stop Valve
Elbow
(Field-Supplied)
Gas Pipe
(Field-Supplied)
154
Stop Valve
Elbow
(Field-Supplied)
Gas Pipe
(Field-Supplied)
NOTES:
1. Ensure that the closing pipe of the gas stop valve (1 place) is removed firstly.
2. Refer to the item 6.2 for the flaring work
(JIS B8607)
Tightening Torque
14 to 18 (N-m)
34 to 42 (N-m)
49 to 61 (N-m)
68 to 82 (N-m)
100 to 120 (N-m)
( KBtu/h )
Stop Valve (Liquid)
Liquid Pipe
(Field-Supplied)
Accessory Pipe (B)
Gas Pipe
(Field-Supplied)
( KBtu/h )
Stop Valve (Liquid)
Accessory Pipe (C )
Accessory Pipe (B)
Liquid Pipe
(Field-Supplied)
( KBtu/h )
Stop Valve (Liquid)
Liquid Pipe
(Field-Supplied)
Accessory Pipe (B)
( KBtu/h )
96
Stop Valve
Socket
(Field-Supplied)
Gas Pipe
(Field-Supplied)
Gas Pipe
(Field-Supplied)
Elbow
(Field-Supplied)
136
( KBtu/h )
Stop Valve
Socket
(Field-Supplied)
Gas Pipe
(Field-Supplied)
Gas Pipe
(Field-Supplied)
Elbow
(Field-Supplied)
Stop Valve (Liquid)
Liquid Pipe
(Field-Supplied)
Stop Valve (Liquid)
Liquid Pipe
(Field-Supplied)
27
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