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 TM 55-1905-220-14-11
5-148. MILK DISPENSER - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
SERVICE (Cont)
(3) Allow one or two pounds of refrigerant to pass through refrigeration system and drain through
discharge line. Turn off regulating valve and permit refrigerant to drain until no audible escape of refrigerant
can be detected.
(4) Swedge discharge tube end.
Remove plug from compressor discharge port. Connect tube to
port by brazing.
(5) Measure out quantity of refrigerant for use in each dispenser as applicable.
(6) Slowly inject required amount of refrigerant in process tube before compressor is operated. After
refrigerant is added, start compressor and allow unit to operate for approximately two hours. Frost shall have
formed on milk can compartment surface and suction tube shall feel warm and have no condensate
accumulation at point where tube leaves insulated cabinet.
(7) Replace dryer again (refer to step 2).
(8) Pinch off process tube as detailed in step 4a(9).
c. Adding refrigerant.
(1) Install quick coupler or hermetic port valve on process tube as detailed in Note following step
4a(2).
(2) Start compressor. Slowly inject small amount of refrigerant in process tube and allow unit to
operate for one to two hours with door open.
(3) Frost shall appear on compartment surface and no condensate shall be evidenced on compressor
suction line at point where tube leaves insulated cabinet.
(4) Pinch off tube (refer to step 4a(9).
d. Bleeding refrigerant. Follow procedures of steps (1) and (4), step c. Use regulator to slowly bleed
off small amount of refrigerant.
5-1555
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