IM 818
Page 17
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 13).
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 12.)
Figure 12. 3-way Suction Valve on Outdoor Unit
Figure 13 Evacuation Schematic
Additional charge
The refrigerant is pre-charged in the outdoor unit. If the tub-
ing length ("L") between the indoor and outdoor unit is no
more than 25 ft., additional charge after evacuation is not
necessary. If the tubing length ("L") is more than 25 ft., use
additional R-22 as indicated in Table 6. (See Installation Dia-
gram on page 5).
Table 6: Additional R-22 ounces per ft. (when tubing
length "L" is more than 25 feet - see Installation
Diagram on page 5)
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 6 and Figure 14.)
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 (See Figure 14).
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. Put back
the service port cap.
Figure 14. 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
Oz. Per Ft.
Max. Length "L"-Ft.
20A
.16
49’
25A
.40
49’
30A
.53
115’
40A
.55
115’
50A
.55
115’
20AR
.16
49’
25AR
.50
49’
30AR
.53
115’
40AR
.55
115’
50AR
.55
115’
Indoor Unit
Outdoor Unit
Liquid side
Gas side
High
Press
.
Low
Press
.
Discharge Valve
Suction Valve
