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Quantech QWC3050T-200T User Manual

Quantech QWC3050T-200T
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FORM QWC3-NM1
ISSUE DATE: 11/20/2020
SECTION 9 – SERVICE AND TROUBLESHOOTING
QUANTECH
164
PROBLEM CAUSE SOLUTION
HIGH DISCHARGE PRESSURE FAULT
1. Tower fans not operating 1. Check tower.
2. Too much refrigerant. 2. Remove refrigerant.
3. Air in refrigerant system. 3. Evacuate and recharge system.
4. Defective discharge pressure
transducer.
4. Replace discharge pressure
transducer. See the Service section
for pressure/voltage formula.
5. Dirty condenser tubes 5. Clean condenser tubes.
LOW LIQUID TEMP FAULT
1. Improperly adjusted leaving chilled
liquid temp. cutout (glycol only).
1. Re-program the leaving chilled liquid
temp. cutout.
2. Micro panel setpoint/range values
improperly programmed.
2. Re-adjust setpoint/range.
3. Chilled liquid ow too low. 3. Increase chilled liquid ow –
See Limitations in
SECTION 4 - INSTALLATION.
4. Defective LWT or RWT sensor.
(assure the sensor is properly
installed in the bottom of the well
with a generous amount of heat
conductive compound).
4. Compare sensor against a known
good temperature sensing device.
See Service section for temp./
voltage table.
MP / HPCO FAULT
1. Compressor internal motor
protector (MP) open.
1. Verify refrigerant charge is not
low. Verify superheat setting of
10° - 15°F (5.6° - 8.3°C). Verify
correct compressor rotation. Verify
compressor is not over loaded.
2. External overload tripped. 2. Determine cause and reset.
3. HPCO switch open. 3. See High Press. Disch. fault.
4. Defective HPCO switch. 4. Replace HPCO switch.
5. Defective CR relay. 5. Replace relay.
COMPRESSOR(S) WON’T START
1. Demand not great enough. 1. No problem. Consult Installation
Manual to aid in understanding
compressor operation and capacity
control.
2. Defective water temperature
sensor.
2. Compare the display with a
thermometer. Should be within +/- 2
degrees. See the Service section for
RWT/LWT temp./voltage table.
3. Contactor/Overload failure. 3. Replace defective part.
4. Compressor failure. 4. Diagnose cause of failure and
replace.
TABLE 26 - TROUBLESHOOTING (CONT’D)

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Quantech QWC3050T-200T Specifications

General IconGeneral
BrandQuantech
ModelQWC3050T-200T
CategoryChiller
LanguageEnglish

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