02 INSTALLATION
25
English
5. Purge the air from the system using vacuum pump for about 10 minutes.
f Close the valve of the low pressure side of manifold gauge
clockwise.
f Make sure that pressure gauge shows -0.1MPa(-76cmHg) after about 10 minutes.
This procedure is very important to avoid a gas leak.
f Turn o the vacuum pump.
f Remove the hose of the low pressure side of manifold gauge.
B(liquid) A(gas)
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 183kgf•cm with a torque wrench.
8. Check for gas leakage.
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.
• Connect the indoor and outdoor units using pipes with ared 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), s
uitable for operating pressures of at least 4200kPa and for a burst pressure of at least 20700kPa. Copper pipe for
hydro-sanitary applications is completely unsuitable.
• For sizing and limits (height dierence, line length, max. bends, refrigerant charge, etc.) see “Connecting
refrigerant pipe section”.
CAUTION
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