Zamil MAC-240, Installation, Operation & Maintenance Manual

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9.3 AIR CONDITIONING SYSTEM
The Model MAC240 Air Conditioner Unit provides reliable operation while requiring a minimum of service and mainte-
nance. This chapter contains information on servicing and maintaining the unit for optimum performance. Detailed ser-
vice and maintenance procedures on the diesel engine generator set may be found in the manufacturer’s publication
manual.
A. General Tools and Equipment:
Certain general tools are required to perform the routine preventative maintenance and servicing procedures outlined in
this manual. The following tools are recommended for use when servicing this equipment.
(1) Open end wrench set
(2) Socket set and drive ratchet
(3) Adjustable wrench
(4) Screwdriver set, flat head and Phillips
(5) Allen wrench set
(6) Canopy lock (key set)
B. Special Tools:
To service the refrigerant system, the following tools are required in addition to the general tools listed above.
(1) Compressor oil pump
(2) Refrigerant leak detector
(3) Vacuum pump
(4) Refrigeration ratchet
(5) Manifold gauges
(6) Refrigerant recovery and recycle system
(7) Micron gauge
(8) Nitrogen cylinder with L.P. regulator
(9) R-22 refrigerant bottle
(10) Scales (for weighing refrigerant cylinder)
(11) Refrigerant recovery and storage tank
C. Refrigerant System:
This unit utilizes refrigerant type R-22 only.
NOTE:
1. In accordance with the Montreal Protocol, venting refrigerant to the atmosphere is not permitted. Never vent refriger-
ant from the system or Freon cylinders to atmosphere. Always use a refrigerant recovery and recycle system.
Observe all local and national statutes concerning the handling of refrigerant chemicals.
2. Each refrigerant system in the Model MAC240 Air Conditioner Unit is an independent circuit. The servicing proce-
dures set forth in this manual are directed toward the servicing of a single refrigerant circuit. Therefore, if more
than one circuit is to be serviced, follow the procedure entirely on one refrigerant circuit before proceeding to the next.
D. Checking Refrigerant Charge:
With the unit running in the cool mode, observe the R-22 refrigerant charge using the refrigerant sight glasses. There is
one sight glass for each refrigerant circuit located in the piping leading to the evaporator coil for that system. A proper
refrigerant charge is evident by the absence of bubbles or the presence of very few bubbles in the refrigerant flow when
viewed through the sight glass. If there are many bubbles in the refrigerant flow, recharge the system must. Each
refrigerant circuit in the Model MAC240 Air Conditioner Unit is independent of the other as stated earlier. When checking
the refrigerant charge for the entire system, be sure to observe the liquid refrigerant flow in each sight glasses.
Whenever the refrigeration system is opened, take care to prevent the entry of moisture and air into the system.