TK 61753-2-MM-EN
97
1. Sight Glass
CChheecckk CCoommpprreessssoorr OOiill LLeevveell -- AAmmbbiieenntt AAiirr TTeemmpp AAbboovvee 1100 CC ((5500 FF))
1. Install a gauge manifold on the compressor.
2. Operate the unit on cool with a 20 psig (1.38 bar) minimum suction pressure and a 185 psig (12.75 bar) minimum
discharge pressure for 15 minutes or more.
3. After the unit has maintained the above conditions for 15 minutes, observe the oil level. The oil should be 1/4 to 1/2
up in the sight glass.
CChheecckk CCoommpprreessssoorr OOiill LLeevveell -- AAmmbbiieenntt AAiirr TTeemmpp BBeellooww 1100 CC ((5500 FF))
1. Run the unit through a complete defrost cycle.
NNoottee:: If the box is empty, you can run the unit on the heat cycle instead of the defrost cycle.
2. After completing the defrost cycle, run the unit on cool for ten minutes.
3. Observe the oil level. The oil should be 1/4 to 1/2 up in the sight glass.
AAddddiinngg CCoommpprreessssoorr OOiill
NNoottee:: Use refrigeration compressor oil ONLY. Polyol Ester P/N 203-513 is required for this units refrigerant.
1. Pump down the compressor and equalize the pressure to slightly positive.
2. Disconnect the compressor oil filter return line or remove the oil fill plug from the top of the compressor and add the
oil.
3. Reattach the oil filter return line to the compressor or reinstall the oil fill plug.
4. Evacuate the compressor before opening the service valves.
High Pressure Cutout Switch (HPCO)
The High Pressure Cut out Switch is located on the discharge manifold of four-cylinder compressors. The switch is
closed with normal pressures and opens add properties to shut the unit down and prevent damage. To test the HPCO,
rework a gauge manifold as shown () and use the following procedure:
1. Connect the gauge manifold to the compressor discharge service valve with a heavy duty, black jacketed thick wall
#HCA 144 hose with a 900 psig (62.04 bar) working pressure rating.
2. Use the Service Test Mode to run the unit (or host unit) in high speed cool.
CCAAUUTTIIOONN
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3. Raise the discharge pressure of the compressor by blocking the condenser coil air flow by covering the condenser
grilles with pieces of cardboard. This should increase the discharge pressure enough to cause the HPCO to cut out.
4. If the HPCO does not open to de-energize the run relay and stop the unit, either the run relay needs to be replaced
or the HPCO itself.
RReeffrriiggeerraattiioonn MMaaiinntteennaannccee
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