| Tweet |
Custom Search
|
|
|
||
 TM 55-1905-220-14-11
5-148. MILK DISPENSER - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
SERVICE
4. Milk
Dispenser
NOTE
In certain service operations, the refrigeration system must be opened to atmosphere allowing air and
moisture to enter the system. When any refrigerant lines have been disconnected, the system must be
purged, or evacuated, and recharged before the dispenser can be operated.
a. Leak detection.
(1) Visibly check refrigeration system components for leaks. Place finger beneath each soldered connection to
check for small deposits of oil indicating leakage. If these procedures fail to uncover leak, proceed as follows: (2)
Connect dispenser to source of refrigerant and dry nitrogen as illustrated.
NOTE
To make connection at quick coupler (Superior No. T555-4A, or equivalent) cut process tube on
compressor. To utilize hermetic port valve (Madden Brass Products No. HP-41, or equivalent), hook
valve over process tube between compressor and pinch off point and tighten valve so needle pierces
tube wall.
(3) Open regulating valve to refrigerant source. When system pressure reaches 30 psig, close regulating valve
in refrigerant line and open regulating valve in dry nitrogen line. Allow system pressure to reach 150 psig, then close
regulating valve.
(4) Use electronic leak detector or Halide torch to check for leaks. When using Halide torch use as small a
flame as possible. Place end of torch exploring tube at point of suspected leakage. Flame will change color if leak is
detected.
5-1552
|
||
|
||
