E-
18
Connecting Up and Purging the Circuit(Cont.)
A
B
C
Vacuum
Pump
COMPLETING THE INSTALLATION
MH080FX
A4
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 (5/8” Packed valve) as shown at the
figure (Value stem: 1/2” - 20UNF).
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 30 minutes.
- Close the valve of the low pressure side of manifold gauge clockwise.
- Make sure that pressure gauge show -0.1MPa(-76cmHg) after about
30 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.
Valve stem
Stem cap
Service port
Adding Refrigerant
If you install the excessive length of pipe, add additional refrigerant as 10g per unit
meter ; refer to the table below.
Refer to the Service Manual for more details on this operation.
Model
Total connecting pipe length (L)
Adding refrigerant
MH050FX*A2*
L
T
≤65.6ft
Chargeless
L
T
>65.6ft
(L
T
- 65.6ft)x0.11oz
MH080FX*A4*
L
T
≤131.2ft
Chargeless
L
T
>131.2ft
(L
T
- 131.2ft)x0.11oz
