Greensource CDi Series SM
Greensource CDi Series SM Model8733819578 (2019/02)
48 | Unit Troubleshooting
Subject to change without prior notice
EXCESSIVELY
WARM SUPPLY AIR
TEMPERATURE IN
COOLING AND/OR
EXCESSIVELY
COOL AIR IN
HEATING
Air flow too high Fan speed setting too high
Consult blower performance table and
reduce fan speed if possible.
High or low
water
temperature
Inlet water temperature out
of range
Check unit capacity vs. water
temperature.
Air leakage
Leaky duct work Inspect the duct work.
Loss of
refrigeration
capacity
Low refrigerant
Check refrigerant pressures with
gauge set.
HIGH HUMIDITY
Air flow is too
high
Fan speed setting is too
high
Consult the blower performance table
and reduce fan speed if possible.
Low
refrigeration
capacity
Low refrigerant
Check refrigerant pressures with
gauge set.
Short cycling
Unit oversized
Check unit performance against
building load calculations.
Poor thermostat location
Make sure that the thermostat is not
located near a supply air duct.
HIGH-PRESSURE
FAULT
Compressor,
Loop Pump
Reduced or no water flow
Check pump operation/check flow
rate
Water temperature out of
range
Bring water temperature within range.
Reduced airflow
Check for dirty air filter or coil. Check
fan motor operation and airflow
restriction.
Overcharged with
refrigerant
Check and service system refrigerant.
RAT outside of nominal
range
Bring air temperature within range.
Bad high pressure switch
Verify continuity and/or replace
switch.
Unit Troubleshooting
Problem Check Possible Cause Action
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