Connecting Up and Removing Air In the Circuit
H
SI
L
G
N
E
E-
23
If you have used...
More than 5 metres
of the pipes
“A”g of refrigerant (R22)
must be added for each
extra metre.
Less than 5 metres
of piping
The purge time is normal
Then...
The outdoor unit is loaded with sufficient R22 refrigerant for 5 metres of piping.
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 capacity and
could lead to a malfunction. Refrigerant for air purging is not charged in the
outdoor unit. Use Vacuum Pump as shown at the figure.
Adding Refrigerant
Refrigerant must be added if the piping measures more than 5 metres in
length (maximum of 50 metres). This operation can only be performed by
a qualified refrigeration specialist.
Connect each assembly pipe to the appropriate valve on the outdoor unit
and tighten the flare nut.
1
Referring to the illustration opposite, tighten the flare nut on section B first
manually and then with a wrench, applying the following torque.
Outer Diameter
Torque
9.52 mm (3/8")
250~280 kgf•cm
19.05 mm (3/4")
990~1210 kgf•cm
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.
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 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(A port), and from the service port cap.
8
A
B
C
D
Outdoor unit
Indoor unit
Gas pipe side
Liquid pipe side
Valve stem
A(gas)
B(liquid)
Stem cap
Vacuum
pump
Outdoor Unit
DH48FTX
DH48GTX
DH60FTX
DH60GTX
DC48FTX
DC48GTX
DC60FTX
DC60GTX
“A”
40
40
50
50
40
40
50
50
When installing, make sure there is no leakage.
When recovering the refrigerant, ground the compressor first before removing
the connection pipe.
If the refrigerant pipe is not properly connected and the compressor works with
the service valve open, the pipe inhales the air and it makes the pressure inside
of the refrigerant cycle abnormally high, It may cause explosion and injury.
Summary of Contents for DH60 T Series
Page 44: ......
