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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
ACETYLENE or other flammable and
poisonous gases into the refrigeration
cycle when performing a leakage test
or an airtight test. These types of
gases
are
because explosion can occur. It is
recommended that compressed air,
nitrogen, or refrigerant be charged for
these types of tests.
Tightening Work of Flare Nut
charge
OXYGEN,
extremely
dangerous
Refrigerant and Drainage Piping
Pipe Size
mm (in.)
6.35(1/4)
9.53(3/8)
12.7(1/2)
15.88(5/8)
- 12 -
Tightening Torque
(kgf-cm)
140-190
350-450
450-550
500-600
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