E-
17
ENGLISH
C
OMPLETING THE
I
NSTALLATION
Connecting Up and Purging the Circuit
◆
MH068FXEA4 / MH080FXEA4
The air in the indoor unit and in the pipe must be purged. If air remains in the
refrigeration pipes, it will affect the compressor, reduce to cooling/heating capacity and
could lead to a malfuction. Refrigerant for air purging is not charged in the outdoor unit.
Use Vacuum Pump as shown at the right figure. Each unit must be purged in turn.
C
C
C
C
A
A
A
A
U
U
U
U
T
T
T
T
II
II
O
O
O
O
N
N
N
N
◆
MH18VP2X / MH19VP2X / MH052FXEA2
Stem cap
Service port
Valve stem
A
B
C
D
Vacuum
Pump
Indoor
A-unit
Indoor
B-unit
Vacuum
Pump
Service port
Valve stem
Stem cap
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 (3/8
”
service valve) as shown at the
figure.
3
Open the valve of the low pressure side of manifold gauge
counter-clockwise.
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 183kgf•cm 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.
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.
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).
3
Open the valve of the low pressure side of manifold gauge
counter clockwise.
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 183kgf•cm 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.
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.