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TORQUE TO BE USED TO TIGHTEN THE CONNECTIONS
Outside
diameter of
the copper
pipe (mm)
Tightening
torque(N·cm)
Strengthened
tightening torque
(N·cm)
Φ6.3 or Φ6
1570(160kgf·cm)
1960(200kgf·cm)
Φ9.52 or
Φ9
2940(300kgf·cm)
3430(350kgf·cm)
Φ12.7 or
Φ12
4900(500kgf·cm)
5390(550kgf·cm)
Φ16
7360(750kgf·cm)
7850(800kgf·cm)
Φ19
9720(900kgf·cm)
11860(1210kgf·cm)
ADDING REFRIGERANT
Units are pre-gassed for up to 5 meters of pipe. Refrigerant must be added if the pipework
measures more than 5 metres (16'5") in length. This operation can only be performed by a
professional F-Gas engineer, for the additional gas amount, see the below
Liquid pipe
diameter
Additional
Refrigerant
Additional Refrigerant
Φ6.3 or Φ6
(1/4
”)
12g per meter added
(Total length of pipe run
– 5 meters) x 12 g
Φ9.52 or Φ9
(3/8
”)
24g per meter added
(Total length of pipe run
– 5 meters) x 24 g
OIL RETURN ELBOW
When the height difference between the indoor and outdoor unit is greater than 5m, in
order to allow oil to return to the compressor, an oil return elbow must be used. See
diagrams below for examples:
Outdoor unit
Outdoor unit
Gas pipe
Oil return pipe
Backstop elbow
Indoor unit
Gas pipe
Oil return pipe
Liquid pipe
Oil return pipe