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 TM 55-1925-273-10-2
OPERATOR'S MANUAL
INLAND AND COASTAL LARGE TUG (LT)
OPERATION UNDER UNUSUAL CONDITIONS
SHIP STORES REFRIGERATION SPLIT PLANT OPERATION
INITIAL SETUP:
Personnel Required:
One Watercraft Engineer, 88L
GENERAL
Should the ship stores refrigeration unit fail, split plant operation provides temporary power to maintain appropriate refrig-
eration temperatures. The following procedures provide for shifting to the standby condenser and for pulldown (both
condensers on line) operation.
SHIFT TO STANDBY CONDENSING UNIT
Perform the following procedures to operate the refrigeration by shifting to the standby condensing unit.
ALIGN ELECTRICAL SYSTEM
1.
At the refrigerator condenser unit, ensure that the main power disconnect switch (figure 1, item 1) is ON.
2.
At the 440V power panel No. 5, verify that the following circuit breakers are ON:
a.
STORES REFRIGERATION PLANT No. 1./FREEZE BOX DEFROST HEATER. (figure 2, item 1).
b.
STORES REFRIGERATION PLANT No. 2. (figure 2, item 2).
! CAUTION
Align the condenser cooling water piping system before starting the refrigeration plant. Damage
to the plant can occur.
START STANDBY REFRIGERATION PLANT 1
Align the condenser cooling water piping system according to the following procedures:
1.
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).
2.
OPEN GS-36 WTR RGLTR COV (figure 3, item 3) or GS-37 WTR RGLTR COV (figure 3, item 4).
3.
CLOSE GS-72 BYP WTR RGLTR (figure 3, item 5) or GS-83 BYP WTR RGLTR (figure 3, item 6).
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