Johnson Controls SABROE HeatPAC, Руководство по эксплуатации

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Operating manual - HeatPAC with reciprocating compressor
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009332 en 2021.07
Operating instructions
A 1°K lower condensing temperature results in a 1% higher cooling performance and 3% lower power
consumption.
Too low evaporating temperature
Cause Solution
Fouling in the evaporator Clean the evaporator.
Oil in the evaporator Inspect the oil recovery system.
Insufficient R717 charge
Check liquid level in evaporator.
Charge more R717 to the plant.
Suction gas superheat should be approx. 1.5 to 4°K.
A 1°K higher evaporating temperature results in a 4% higher cooling performance.
Missing oil
During the first 50 hours of operation, the compressor will lose oil. A few litres of oil will accumulate at
the bottom of the oil separator, condenser and evaporator and never return to the compressor. It is
therefore not unusual that the compressor needs to be recharged with oil.
If the oil continues to disappear from the compressor, the oil return and recovery system must be
checked.
Cause Solution
Defect oil return/
oil recovery system
1. Check the function and position of the oil float switch (see descrip-
tion of oil recovery pot). When the float is up, the switch must be
closed (ON) and vice versa.
2. Check that the piston in the oil recovery pot is able to move
smoothly.
3. Check all solenoid valves and filters.
4. Check timers in UniSAB III.
See UniSAB III settings list for timer settings.
5. Check if the oil separator is filled with oil. If so, adjust the timers in
UniSAB III. Increase the solenoid valve “ON” time.
In the period after start-up and at low-load operation, the oil recovery system will return more oil to the
compressor than during full load.
At part-load operation, the oil will settle easier because of less boiling in the evaporator.