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1. Use only dry nitrogen with a pressure regulator for
pressurizing unit. Pressurize with 150 psi of dry nitro-
gen.
2. Apply soap and water to check whether the joints are
leaky. A leak detector can also be applied for a leakage
test.
Hint: You may want to perform leak testing and evacua-
tion before wiring to save time, electrical connections can
be completed while your vacuum pump is running.
Pressure and Leak Test
Installation
Note: The outdoor unit contains a refrigerant charge, leave
liquid and gas valves closed.
1. After no leaks have been detected, connect a vacuum
pump to the outdoor unit.
2. Connect appropriate hoses to manifold gauge, vacuum
pump and unit refrigeration connections.
3. Evacuate the system until the micron gauge reads no
higher than 350 microns.
4. Close valve to vacuum pump; if pressure does not rise
above 500 microns after one minute, the evacuation
should be complete.
5. If it does rise, check for leaks and/or evacuate longer.
6. For refrigerant lines longer than 25 feet, refer to in-
stallation instructions chart included with the unit
installation manual for additional charge.
Evacuating the System
