FORM NO.: 6U5M-A11M-NB-EN
JOHNSON CONTROLS 51
TROUBLE SHOOTING (CONT’D)
TABLE21 – TROUBLE SHOOTING (CONT’D)
“Low Leaving Water
Temp” Fault
1.
Improperly adjusted leaving chilled
liquid temp. cutout (glycol only).
2.
Micro panel setpoint/range values
improperly programmed.
3.
Chilled liquid flow too low.
4.
Defective LWT or RWT sensor (as- sure
the sensor is properly installed in the
bottom of the well with a generous
amount of heat conductive compound).
1. Re-program the leaving chilled liquid
temp. cutout.
2. Re-adjust setpoint/range.
3. Increase chilled liquid flow - refer
to limitations in installation section.
4. a. Compare sensor against a known
good temperature sensing device.
b. Replace defective sensor.
Compressor(s) Won’t
Start
1. Defective water temperature sensor.
2. Overload failure.
3. Driver failure.
4. Compressor failure.
1.
Compare the display with a
thermometer. Should be within +/- 2
degrees.
2.
Replace defective part.
3.
Check driver running status and the
flicker of LEDs.
4.
Diagnose cause of failure and
replace.
Fan Protect
1. Power or communication loss.
2. Internal fan fault.
1. Check the wiring;
2. Contract local service for further fault
analysis.
Lack of Cooling or
Heating Effect
1. Fouled evaporator surface (in cooling
mode). Low suction pressure will be
observed.
2. Fouled coil surface (in heating mode).
Low suction pressure will be observed.
3. Improper flow through the evaporator.
4. Low refrigerant charge. Low suction
pressure will be observed.
1.
Contact the local Johnson
Controls representative.
2.
Contact the local Johnson
Controls representative.
3.
Reduce flow to within chiller design
specs. See limitations in Installation
section.
4.
Check subcooling and add charge as
needed.
Cooke Industries - Phone: +64 9 579 2185 Email: sales@cookeindustries.co.nz Web: www.cookeindustries.co.nz
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