Refrigerant and Drainage Piping
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Refrigerant and Drainage Piping
3.2 Refrigerant Piping
(1) Check to ensure that the stop valves of outdoor unit have been closed.
(2) Attach the connection pipes to the stop valves.
(3) Remove the air inlet grill, filter, filter guide and lower front cover.
(4) Connect the indoor and the outdoor unit with the specified refrigerant pipes.
(5) Charge nitrogen or refrigerant from the check joint of the liquid stop valve, using a Gas Leak Detector perform
leakage test
(6) After completing the piping, the entire exposed tube adapter shall be duly covered with insulator and tightened
with a band.
Tightening Flare Nut –
When tightening the flare nut, utilize two spanners as shown below.
The required tightening torque is as follows:
Do not charge OXYGEN,
ACETYLENE or other flammable and
poisonous gases into the refrigeration
cycle when performing a leakage test
or an air tight test. These types of
gases are extremely dangerous,
because explosion can occur. It is
recommended that compressed air,
nitrogen or refrigerant be charged for
these types of tests.
▲
DANGER
！
Pipe Size
Tightening Torque
mm (in.)
(kgf-cm)
6.35(1/4) 140-190
9.53(3/8) 350-450
12.7(1/2) 450-550
15.88(5/8) 500-600
Tightening Work of Flare
