E-
17
ENGLISH
Connecting Up and Purging the Circuit
Vacuum
Pump
Indoor
A-unit
Indoor
B-unit
Valve stem
Stem cap
Service port
COMPLETING THE INSTALLATION
MH050FX
A2
1
Check the piping connections.
2
Connect the charging hose of low pressure side of manifold gauge to the
packed valve having a service port as shown at the figure.
WARNING:
Make the electrical connection and leave the system into “stand by mode”. Do
not turn on the system!.
This is necessary for better vacuum operation (full OPEN position of Electronic
Expansion Valve - EEV -).
3
Open the valve of the low pressure side of manifold gauge counter-clockwise.
4
Purge the air from the system using vacuum pump for about 10 minutes.
- Close the valve of the low pressure side of manifold gauge clockwise.
- Make sure that pressure gauge show -0.1MPa(-76cmHg) after about 10
minutes.
This procedure is very important in order to avoid gas leak.
- Turn off the vacuum pump
- Remove the hose of the low pressure side of manifold gauge.
5
Set valve cork of both liquid side and gas side of packed valve to the open
position.
6
Mount the valve stem nuts and the service port cap to the valve,
and tighten them at the torque of 13.2 ft•lb with a torque wrench.
7
Check for gas leakage.
- At this time, especially check for gas leakage from the 3-way valve’s stem
nuts, and from the service port cap..
The outdoor unit is loaded with sufficient R410A refrigerant.Do not vent
R-410A into atmosphere: it is a fluorinated greenhouse gas, covered by Kyoto
Protocol, with a Global Warming Potential (GWP) = 1975.
You should purge the air in the indoor unit and in the pipe.
If air remains in the refrigerant pipes, it affects the compressor. It may cause
reduction of cooling capacity and malfunction.
Refrigerant for air purging is not charged in the outdoor unit.
Use Vacuum Pump as seen in the picture.