83003702.K Operating Instruction
Type KPC 108-L-U/S
page 36
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Single-Stage Hermetic Compliant SCROLL Motor-Compressor
Type ZR xx K3E-TWD-561
If oil is charged into a system it is recommended to charge systems with POE containing no more than 50 ppm moisture
content. If the moisture content of the oil in a refrigeration system reaches unacceptable high levels, corrosion and copper
plating may occur. The system should be evacuated down to 0.3 mbar or lower. If there is uncertainty, as to the moisture
content in the system, an oil sample should be taken and tested for moisture. Sight glass/moisture indicator will just
show the moisture contents of the refrigerant. The actual moisture level of POE would be higher than the sight glass
specifies. This is a result of the high hygroscopicity of the POE oil. Oil samples would have to be taken from the system
and analyzed to determine the actual moisture content of the lubricant.
Crankcase Heater (240 V, 70 W)
The crankcase heater must be mounted below the oil removal valve located on the
bottom shell.
The crankcase heater must remain energized during compressor off cycles.
The crankcase heater must be turned on a minimum of 12 hours prior to starting
the compressor. This will prevent oil dilution and bearing stress on initial start up.
If it is not feasible to turn on the crankcase heater 12 hours in advance of starting
the compressor, then use one of the techniques listed below to prevent possible
flooded-start damage to the compressor:
1) Direct a 500 watt heat lamp or other safe heat source (do not use torch) at the lower shell of the compressor for
approximately 30 minutes to boil off any liquid refrigerant prior to starting; or
2) Bump start the compressor by manually energizing the compressor contactor for about one second. Wait five
seconds and again manually energize compressor for one second. Repeat this cycle several times until the liquid in
the shell has been boiled off and the compressor can be safely started and run continuously.
Discharge Temperature Protection
A thermistor with a nominal response temperature of 140 °C is located in the discharge port of the fixed scroll. Excessive discharge
temperature will cause the electronic protector module to trip. The discharge gas sensor is wired in series with the motor
thermistor chain.
