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22
NOTE: You may want to perform leak testing and evacuation before wiring to save time,
electrical connections can be completed while your vacuum pump is running.
Additional Charge
Refrigerant for the pipe length of 25 feet has been charged at the factory. If the piping is greater than
25 feet additional charging is necessary. For the additional amount, see the table below.
Model Add’l Refrigerant (oz/ft (g/m)
18,000 0.3 (30)
24,000 0.6 (60)
30,000 0.6 (60)
36,000 0.6 (60)
42,000 0.6 (60)
48,000 0.6 (60)
TESTING AND INSPECTION
Pressure gauge (low-pressure)
Pressure gauge (hi-pressure)
Gauge manifold
Connection pipe
Cap
Cap
Service pipe
Cap
Hose with the valve pin
Hose
Vacuum pump
Hose
Switch (hi-pressure)
Switch (low-pressure)
Connection pipe (to indoor unit)
Liquid valve
Gas valve
Service port
Pipe Testing
Leak Test
Refrigerant lines should be pressurized prior to evacuating system to check for leaks. Use only dry nitrogen
with a pressure regulator for pressurizing unit. Pressurize with 150 psi of dry nitrogen. Apply soap and
water to check whether the joints are leaky. A leak detector may also be used for a leakage test.
Use vacuum pump, rather than refrigerant, to discharge air when installing the unit.
CAUTION
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