C
OMPLETING THE INSTALLATION
E-38
Connecting Up and Purging the Circuit
The outdoor unit is loaded with sufficient R-22 refrigerant for 16.4 feet
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 /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 figure.
☛ If you have used... Then...
More than 16.4' 0.1 oz of refrigerant (R-22)
of piping must be added for each
extra foot.
Less than 16.4' The purge time is normal.
of piping
1 Connect each assembly pipe to the appropriate valve on the outdoor unit
and tighten the flare nut.
2 Referring to the illustration opposite, tighten the flare nut on section B first
manually and then with a wrench, applying the following torque.
Pipe Outer Diameter Torque (kg
.
cm)
Liquid refrigerant
6.35 mm(1/4”) 160(11 ft•lb)
Gas refrigerant 9.52 mm(3/8”) 300(21 ft•lb)
Gas refrigerant 12.70 mm(1/2”) 500(36 ft•lb)
3 Connect the charging hose of low pressure side of manifold gauge to the
packed valve having a service port (3/8” or 1/2” Packed valve) as shown
at the figure.
4 Open the valve of the low pressure side of manifold gauge counter-
clockwise.
5 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.
-
Remove the hose of the low pressure side of manifold gauge.
6 Set valve cork of both liquid side and gas side of packed valve to the open
position.
7 Mount the valve stem nuts to the 2-way and 3-way valve.
And mount the service port cap to 3-way valve.
8 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.
Adding Refrigerant
Refrigerant must be added if the piping measures more than 5 metres in length
(maximum of 10 metres). This operation can only be performed by a qualified
refrigeration specialist.
Refer to the Service Manual for more details on this operation.
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