Startup and operational check. - TM-55-1905-223-24-170037

TM 55-1905-223-24-17

WARNING

Do not open crankcase until compressor has been isolated and purged of refrigerant charge.

Check oil level in compressor observation window. The level must be near the half-way

point in the window. Add or remove compressor oil as required to bring the oil to the half-

way level (Item 5, PMCS Table 2-1).

Check moisture indicator in refrigerant line to make sure there is no moisture in the system.

The indicator will be GREEN if the system is dry and YELLOW if wet. If a wet condition

exists, the system must be purged, evacuated, and recharged with R-22 (Item 9, Table 2-

2).

Make sure that no electrical components are wet for any reason. Locate the problem and

correct as required before turning power ON to the unit.

Close all cabinet and terminal box panels before starting unit.

Check thermostats to make sure the selector is in the COOL position. Set all thermostats

to their lowest (coldest) setting for operational checks.

Turn electrical power ON, start the unit, and conduct operational check.

(b)

Startup and operational check.

Turn electrical power ON at the primary circuit breaker to the unit.

Make sure the external seawater pump is ON.

Visually check to see that condenser

seawater is properly discharging overboard.

Turn the compressor control and fan switches in the terminal box to the ON position.

Run the unit for 5 minutes and visually check the refrigerant flow sight glass. After the

compressor has run for 5 minutes, a foggy or bubbling liquid in the refrigerant line sight

glass indicates a shortage of refrigerant. Add R-22 as required.

CAUTION

Do not add refrigerant if the sight glass is clear.

Check the discharge and return air temperatures. There should be a 15 to 25 degree

difference in the two temperatures. If not, refer to Troubleshooting, Table 2-2.

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