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Page 16
IM 796
Evacuating and Charging
Evacuating the tubing and the indoor unit
The outdoor unit is pre-charged with refrigerant R-22. The
indoor unit and the refrigerant connection tubing must be
evacuated as follows:
1.
Remove the 3 caps from the valves on the outdoor unit.
2. Connect the center of the charging gauge to the vacuum
pump.
3. Connect the charging gauge to the service port of the
3-way valve.(
See Figure 15
.)
4. Start the pump and evacuate to -760 mm Hg (-29.9" Hg).
5. Close the valve of the changing gauge and stop the vac-
uum pump.
6. On the outdoor unit, open both valves using a 4 mm
Allen wrench. (
See Figure 15
.)
Figure 15. 3-way Suction Valve on Outdoor Unit
Figure 16 Evacuation Schematic
Additional charge
The refrigerant is pre-charged in the outdoor unit. If the tub-
ing length between the indoor and outdoor unit is no more
than 25 ft. than an additional charge after evacuation is not
necessary. If the tubing length is more than 25 ft., use addi-
tional R-22 as indicated in
Table 5
.
Table 5: Additional R-22 ounces (when tubing length is
more than 25 feet)
Charge operation
This operation must be done by weighing the R-22 being
added thru the service port on the 3 way suction valve.
See
Table 5. See Figure 17.
1.
Remove the service port cap.
2. Connect the low pressure side of the charging gauge to
the suction service port center of the cylinder tank and
close the high pressure side of the gauge. Purge the air
from the service hose.
3. Start the air conditioner unit.
4. Open the gas cylinder and low pressure charging valve.
5. When the required refrigerant quantity is pumped into
the unit, close the low pressure side and the gas cylinder
valve.
6. Disconnect the service hose from service port. Replace
the service port cap.
Figure 17. Charging Schematic
Hex Socket
for 4 mm
Allen wrench
Flare Nut
Refrigerant
Tubing
Service
Port
Outdoor Unit
3-way Valve
Indoor Unit
Liquid side
Outdoor Unit
Close
Discharge Valve
Suction Valve
Close
Gas side
Vacuum
Pump
High
Press.
Low
Press.
Model
26’ - 33’
34’ - 40’
41’ - 50’
10F
1.0
2.0
-
15F
1.0
2.0
-
20F
1.0
2.0
3.5
25F
3.0
5.3
9.0
10FR
1.6
3.0
-
15FR
1.6
3.0
-
20FR
2.0
3.5
6.0
25FR
4.0
7.0
12.0
Indoor Unit
Outdoor Unit
Liquid side
Gas side
High
Press.
Low
Press.
Discharge Valve
Suction Valve