Shutdown. - TM-55-1905-223-24-170038

TM 55-1905-223-24-17

NOTE

After an air conditioner has been OFF for an extended period of time, it may take

several hours for the unit to reach maximum cooling performance. This is

especially true in high ambient temperatures.

While the unit is running, listen for excessive noise or vibration. Locate and correct as

required (Troubleshooting, Table 2-2).

After the unit has run for 30 minutes, check the operating suction (low side) and discharge

(high side) pressures on the fixed manifold gauges in the system. Operating pressures for

the suction (low side) of the system must not exceed 85 psig nor drop below 50 psig. The

55 psig to 72 psig range is normal. The discharge (high side) of the system must not

exceed 300 psig nor drop below 170 psig. The 170 psig to 230 psig range is normal. If

pressures are not within their normal ranges, refer to Troubleshooting, Table 2-2, locate the

problem, and correct as required.

Adjust the water regulating valve in seawater discharge line to 210 psig (discharge head

pressure) by loosening locknut and turning adjusting screw.

When all operational checks have been made, return all thermostats to their desired

temperature settings.

(c)

Shutdown.

Turn all thermostats to OFF.

Turn compressor control switch OFF in the terminal box.

Turn primary circuit breaker to the unit OFF. Tag the breaker if it being secured for a

maintenance function.

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