Electrical Connections - Goodman GSZ140311 Installation & Service Reference

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Table of Contents

To avoid possible explosion, the line from the

nitrogen cylinder must include a pressure

regulator and a pressure relief valve. The

pressure relief valve must be set to open at no

more than 450 psig.

Leak test the system using dry nitrogen and soapy

water to identify leaks. If you prefer to use an electronic

leak detector, charge the system to 10 PSIG with the

appropriate system refrigerant (see Serial Data Plate

for refrigerant identification). Do not use an alternative

refrigerant. Using dry nitrogen finish charging the system

to 450 PSIG. Apply the leak detector to all suspect areas.

When leaks are discovered, repair the leaks, and repeat

the pressure test. If leaks have been eliminated proceed to

system evacuation.

System Evacuation

Condensing unit liquid and suction valves are closed to

contain the charge within the unit. The unit is shipped with

the valve stems closed and caps installed. Do not open

valves until the system is evacuated.

REFRIGERANT UNDER PRESSURE!

Failure to follow proper procedures may cause

property damage, personal injury or death.

NOTE: Scroll compressors should never be used

to evacuate or pump down a heat pump or air

conditioning system.

Prolonged operation at suction pressures less

than 20 psig for more than 5 seconds will result

in overheating of the scrolls and permanent

damage to the scroll tips, drive bearings and

internal seal.

Deep Vacuum Method (Recommended)

The Deep Vacuum Method requires a vacuum pump

rated for 500 microns or less. This method is an effective

and efficient way of assuring the system is free of non-

condensable air and moisture. As an alternative, the Triple

Evacuation Method is detailed in the Service Manual for

this product model.

It is recommended to remove the Schrader Cores from the

service valves using a core-removal tool to expedite the

evacuation procedure.

WARNING

CAUTION

1. Connect the vacuum pump, micron gauge, and

vacuum rated hoses to both service valves.

Evacuation must use both service valves to eliminate

system mechanical seals.

2. Evacuate the system to less than 500 microns.

3. Isolate the pump from the system and hold vacuum

for 10 minutes (minimum). Typically, pressure will rise

slowly during this period. If the pressure rises to less

than 1000 microns and remains steady, the system is

considered leak-free; proceed to system charging and

startup.

4. If pressure rises above 1000 microns but holds steady

below 2000 microns, non-condensable air or moisture

may remain or a small leak is present. Return to step

2: If the same result is achieved check for leaks and

repair. Repeat the evacuation procedure.

5. If pressure rises above 2000 microns, a leak is

present. Check for leaks and repair. Repeat the

evacuation procedure.

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