OMM TGZ-1 TGZ 040A through TGZ 190A 77
Electrical Terminals
!
Warning
To avoid injury from electric shock hazard, turn off all power before continuing with
the following service.
All power electrical terminals should be retightened every six months, as they tend to
loosen in service due to normal heating and cooling of the wire.
Operating Limits
•
Maximum allowable condenser water pressure is 225 a psig (1552 kPa).
•
Maximum allowable evaporator water pressure is 175 psig (1207 kPa).
•
Maximum leaving condenser water temperature is 130°F (54.4°C) with R-22 and
160°F (71.1°F) with R-134a.
•
Maximum allowable water temperature to evaporator in a nonoperating cycle is
105°F (40.5°C). Maximum entering water temperature for operating cycle is 90°F
(32.2°C) (for example, during system changeover from heating to cooling cycle).
•
Minimum leaving water temperature from the cooler without fluid freeze protection
is 40°F (4.4°C).
•
Minimum entering condenser water temperature is 60°F (15.6°C).
Compressor Oil
The oil level should be watched carefully upon initial start-up and for sometime
thereafter.
Oil Type
Compressor oil must be:
• Copeland brand Ultra 22 CC
• Copeland brand Ultra 32 CC
• Copeland brand Ultra 32-3MAF
• Mobil EAL Artic 22 CC
• Uniqema RL32-3MAF
These are synthetic polyolester lubricants with anti-wear additives and are highly
hygroscopic. Care must be taken to minimize exposure of the oil to air when charging
oil into the system.
Oil can be added to the Copeland compressor through the oil fill hole in the crankcase.
To add oil, isolate the crankcase and pour or pump in the necessary oil. If the system
contains no refrigerant, no special precautions are necessary other than keeping the oil
clean and dry.
If the system contains a refrigerant charge, close the suction valve and reduce crankcase
pressure to 1 to 2 psig (6.9 to 13.8 kPa). Stop the compressor and close the discharge
valve.
Add the required amount of oil. During the period the compressor is exposed to the
atmosphere, the refrigerant will generate a vapor pressure, retarding the entrance of
contaminants. Before resealing the compressor, purge the crankcase by opening the
suction valve slightly for 1 or 2 seconds. Close the oil port, open the compressor valves
and restore the system to operation.
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