Troubleshooting | 31Greensource CDi Series TW Model
8733954853 (2020/04)Greensource CDi Series TW Model
Subject to change without prior notice
TROUBLESHOOTING
A possible fault may be one or a combination of causes and solutions. Check each cause and verify each
before making any conclusion.
Unit Troubleshooting
Problem Possible Cause Checks and Corrections
ENTIRE UNIT DOES
NOT RUN
Power Supply Off Close disconnect, apply power
Blown Fuse/Tripped
Breaker
Replace fuse or rest circuit breaker. If using fuses, ensure
they are the correct size.
Voltage Supply Low
If voltage is below minimum voltage specified on unit data
plate, contact local power company.
UNIT OFF DUE TO
HIGH-PRESSURE
CONTROL
Discharge Pressure is Too
High
If in “COOLING” mode: Lack of or inadequate water flow.
Entering water temperature is too warm. Scaled or
plugged condenser.
If in “HEATING” mode: Lack of or inadequate load side
fluid flow.
Refrigerant Charge
The unit is overcharged with refrigerant. Reclaim
refrigerant, evacuate and recharge with factory
recommended charge.
High-Pressure Switch
Check for a defective or improperly calibrated high-
pressure switch.
High-Pressure Fault
If the unit has UMC and a 40° F freeze sensor is being
used, this sensor is in series with HP switch and this will
show as a HP fault and not a freeze fault.
UNIT OFF TO
LOW-PRESSURE
CONTROL
Suction Pressure
Too Low
If in “COOLING” mode: Lack of or inadequate Source side
fluid. flow. Entering water temperature is too cold.
If in “HEATING” mode: Lack of or inadequate water flow.
Entering water temperature is too cold. Scaled or plugged
condenser.
Refrigerant Charge
The unit is low on refrigerant. Check for refrigerant leak,
repair, evacuate and recharge with factory recommended
charge.
Low-Pressure Switch
Check for defective or improperly calibrated low-pressure
switch.
Low-Pressure Fault
If the unit has UMC and the DPS option is being used, this
sensor is in series with LP switch and this will show as a
LP fault and not a DPS fault.
UNIT SHORT
CYCLES
Unit Oversized Recalculate heating and or cooling loads.
Thermostat
If the thermostat is installed near a supply air grill,
relocate thermostat. Adjust the heat anticipator.
Wiring and Controls
Check for defective or improperly calibrated low-pressure
switch.
To Next Page
Loading...
Need help?
General