20
5 . Purge the air from the system using vacuum pump for about 10 minutes .
f
f
Close the valve of the low pressure side of manifold gauge clockwise .
f
f
Make sure that pressure gauge shows -0 .1 MPa(-76cmHg) after about 10
minutes . This procedure is very important to avoid a gas leak .
f
f
Turn off the vacuum pump .
f
f
Remove the hose of the low pressure side of manifold gauge .
6 . Set valve cork of both liquid side and gas side of packed valve to the open
position .
7 . Mount the valve stem nuts and the service port cap to the valve, and tighten
them at the torque of 158 .8 lbf•in with a torque wrench .
8 . Check for gas leakage .
f
f
At this time, especially check for gas leakage from the 3-way valve’s stem
nuts(A port), and from the service port cap .
B(liquid)
A(gas)
• Connect the indoor and outdoor units using pipes with flared connections (not supplied) . For the lines, use
insulated, unwelded, degreased and deoxidized copper pipe, (Cu DHP type to ISO 1337 or UNI EN 12735-1),
suitable for operating pressures of at least 4200 kPa and for a burst pressure of at least 20700 kPa . Copper pipe
for hydro-sanitary applications is completely unsuitable .
• For sizing and limits (height difference, line length, max . bends, refrigerant charge, etc .) see “Connecting
refrigerant pipe section” .
CAUTION
Connecting up and removing air in the circuit
4way Outdoor_북미향_IM_EN_05138A-00.indd 20
2014-12-08 오후 3:12:47
