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 TM 55-1905-219-14-8
4-28.
AIR CONDITIONING SYSTEM-MAINTENANCE INSTRUCTIONS (Continued).
Cooling Coil Data
Manufacturer
McIntyre
Model No.
56DF
Capacity
7.5 tons
Air Quantity
1260 cfm (117 cmm)
Face Velocity
252 fpm (76.8 mpm)
Entering Air Temp
85.2F DB (dry bulb)
(29.6 )
C
74.0F WB (wet bulb)
(23.3 )
C
Leaving Air Temp
* DB
* WB
* Leaving Air Temperature to be established
by the shipyard.
(11) Strainers.
Since the refrigerant is capable of removing particles of dirt and scale from surfaces, refrigerant
strainers are provided in the liquid line and in the compressor suction manifold. An oil strainer in the
compressor crankcase is also provided.
(12) Sight Flow Indicator.
The sight flow indicator is a sight glass, installed in the main liquid line, which permits observation of
the liquid refrigerant in the line. A solid column of liquid should be visible. If bubbles appear in the liquid, it is
an indication that there is a shortage of refrigerant in the system.
(13) High and Low Pressure Control Switches.
(a) The high pressure control switch is a safety device which stops the compressor in the event of
excessive pressure in the high pressure side of the system. Either switch permits the compressor to be started
again without resetting or starting through motor controller, when the pressure drops to its cut-in setting.
(b) The low pressure control switch is an operating control which stops and starts the compressor at
predetermined suction pressures.
(c)
These two controls are usually combined in one switch box called the dual pressurestat.
4-816
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