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 TM 55-1925-273-10-2
0128 00
PULLDOWN MODE OPERATION
The following procedures perform ship stores refrigeration in the pulldown mode.
Align the electrical system according to the following procedure:
1.
At the main power disconnect switch, ensure that the main power disconnect 1 is in the ON position on the standby
refrigeration condensing unit.
2.
At 440V power panel No. 5, ensure that the following circuit breakers are set to ON:
a.
STORE REFRIGERATION PLANT No. 1./FREEZE BOX DEFROST HEATER. (figure 2, item 1)
b.
STORE REFRIGERATION PLANT No. 2. (figure 2, item 2)
START STANDBY REFRIGERATION PLANT 1
! CAUTION
Align the condenser cooling water piping system before starting refrigeration plant. Damage to
the refrigeration plant can occur.
Start the standby refrigeration plant 1 according to the following procedure:
1.
Align the condenser cooling water system.
a.
OPEN GS-34, A/C COND No. 2 SPLY (figure 3, item 1) or GS-33, A/C COND No. 1 SPLY (figure 3, item 2).
b.
OPEN GS-36, WTR REGLTR COV (figure 3, item 3) or GS-37 WTR REGLTR COV (figure 3, item 4).
c.
CLOSE GS-72, BYP WTR RGLTR (figure 3, item 5) or GS-83 BYP WTR RGLTR (figure 3, item 6).
! CAUTION
When starting the compressor, avoid rapid pumpdown to ensure that oil is not carried off with the
refrigerant. If oil is pulled from sump, ensure that the oil pressure is a minimum of 16 PSI above
suction pressure. If the pressure drops below this, stop the compressor and add oil temporarily.
The added oil must later be removed when the oil in the sight glass is too high. If this situation
occurs, refer to unit maintenance. Low oil pressure and oil level could damage compressor.
NOTE
Before starting the compressor, the crankcase heater must be energized for 24 hours. Energizing
the heater for this period of time should drive all refrigerant from the oil.
ALIGN CONDENSER UNIT PIPING
Align the condenser unit piping according to the following procedure:
1.
OPEN the COMPRESSOR DISCHARGE valve (figure 1, item 2).
2.
CLOSE the COMPRESSOR SUCTION valve (figure 1, item 3).
3.
OPEN the CONDENSER OUTLET valve (figure 1, item 4).
4.
OPEN the DEHYDRATOR OUTLET valve (figure 1, item 5).
0128 00-7
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