Reznor YDHA - 7 Troubleshooting; Troubleshooting - Refrigeration

Form O-Y P/N 273647R5, Page 43
IMPORTANT: Do not release refrigerant to the atmosphere!
If required service procedures include the adding or removing of
refrigerant, the service technician must comply with all federal,
state and local laws. The procedures discussed in this manual
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NOTE: Unit is equipped with a phase loss/phase reversal control. If system
does not start, check phase of electrical supply.
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on the unit controller.
7.0 Troubleshooting
7.1 Troubleshooting - Refrigeration
General Refrigeration Circuit
SYMPTOM POSSIBLE CAUSE REMEDY
$&RPSUHVVRU
will not start.
1. Power off, loose electrical connections or
fuse open.
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repair as necessary
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Replace parts as necessary.
3. Internal compressor thermal overload
open.
3. If compressor is hot, allow 2 hours to cool. See D. Below.
&RPSUHVVRUGHIHFWLYH &KHFNFRPSUHVVRUIRUHOHFWULFDOIDLOXUH&RPSUHVVRUPD\EH
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5. High or low pressure switch open or
defective.
5. If manual reset (high pressure), reset switch. (Switch opens at
600 psi and will not reset above 400 psi.)
If auto reset (low pressure) does not reset and everything else is
OK, replace low pressure switch, P/N 216380.
%&RPSUHVVRU
starts but
cuts out on
low pressure
(low pressure
switch
activates at 35
psig.)
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duct design.
3. Restriction in refrigerant line. &KHFNVXEFRROLQJDQGVXSHUKHDW3DUDJUDSK&KHFN
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4. Defective low pressure switch. &KHFNVZLWFKRSHQVSVLFORVHVSVL,IGHIHFWLYHUHSODFH
low pressure switch, P/N 216380.
&&RPSUHVVRU
starts but
cuts out on
high pressure
switch.
1. Refrigerant overcharge. &KHFNVXEFRROLQJVHH3DUDJUDSK
&RQGHQVHUIDQPRWRUGHIHFWLYH &KHFNIDQPRWRU
&RQGHQVHUFRLOLQOHWREVWUXFWHGRUGLUW\ &KHFNFRLODQGLQOHWFOHDUDQFHVDQGIRUSRVVLEOHDLUUHFLUFXODWLRQ
4. Air or non-condensables in system. &KHFNKLJKVLGHHTXDOL]HGSUHVVXUHUHDGLQJZLWKHTXLYDOHQW
outdoor temperature.
5. Defective high pressure switch. &KHFNVZLWFKRSHQVSVLSURRISVLPDQXDOUHVHWDOORZHG
below 400 psi). If defective, replace high pressure switch, P/N
216379.
6. Restriction in discharge or liquid line. &KHFNVXEFRROLQJDQGVXSHUKHDW3DUDJUDSK&KHFN
operation of thermal expansion valves.
'&RPSUHVVRU
cuts out
on thermal
overload.
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2. Sustained high discharge pressure. &KHFNUXQQLQJDPSHUDJHDQGFRQGLWLRQVGHVFULEHGLQ,
3. High suction and discharge pressures. &KHFNWKHUPDOH[SDQVLRQYDOYHRSHUDWLRQFKHFNIRUDLULQV\VWHP
4. Defective compressor overload. 4. If compressor is hot, allow compressor to cool for two hours.
Recheck for open circuit.
5. Improper refrigerant charge. &KHFNVXEFRROLQJ3DUDJUDSK
6. Bearings or pistons too tight. &KHFNIRUORZRLOOHYHO
7. Allow time for compressor to cool. &KHFNGRPHWHPSHUDWXUHRIWKHFRPSUHVVRU
E. Noisy
compressor.
1. Reverse rotation. &KHFNDWVWDUWXS,IWKHVXFWLRQSUHVVXUHULVHVDQGGLVFKDUJH
pressure drops, shut down the compressor. Switch the 3-phase
wiring connections.
2. Refrigerant overcharge. &KHFNSUHVVXUHVDQGVXEFRROLQJ3DUDJUDSK
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refrigerant overcharge (Paragraph 3.6).
4. Tubing rattle. 'DPSHQWXELQJYLEUDWLRQE\WDSLQJRUFODPSLQJ&DUHIXOO\EHQG
tubing away from contact where possible.
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