61
Table 20 —
Troubleshooting
FAULT
COOLING HEATING
CHECK
POSSIBLE CAUSE
SOLUTION
No Compressor
Operation but Fan
Runs
X
Is fault LED Blinking
1 time?
High Pressure fault - no or low
water flow
Check water valves and/or pumps for proper operation.
Check for water coil blockage.
High Pressure fault - high water
temperature
Check water temperature - is it in range?
High Pressure fault - fouled or
scaled water coil
Check for proper flow rate and water temperature, but low
water side temp rise in cooling.
X
High Pressure fault - no or low
airflow
Check fan motor for proper operation.
Check air filter.
Inspect air coil for dirt/debris.
Check ductwork - are dampers closed or blocked?
X
Is fault LED Blinking
2 times?
Low Pressure fault - no or low
airflow
Check fan motor for proper operation.
Check air filter.
Inspect air coil for dirt/debris.
Check ductwork - are dampers closed or blocked?
Low Pressure fault - low refrigerant Check refrigerant pressure with gage set.
X
Low Pressure fault - no or low
water flow
Check water valves and/or pumps for proper operation.
Check for water coil blockage.
Low Pressure fault - low refrigerant Check for proper flow rate and water temperature, but low
water side temp drop in heating.
X
Is fault LED Blinking
3 times?
Freeze fault, water coil - no or low
water flow
Check water valves and/or pumps for proper operation.
Check for water coil blockage.
Freeze fault - low water
temperature
Check water temperature - is it below 40°F entering? If heat
pump is connected to a closed loop with antifreeze check that
the "FREEZE 1" resistor on the UPM board has been cut to
set the unit to antifreeze mode.
Freeze fault - low refrigerant
Check refrigerant pressure with gage set.
X
Is fault LED
Blinking
4 times?
Condensate fault - poor drainage Check condensate pan for high water level. Check drain line
for blockages, double trapping or inadequate trapping.
Condensate fault - blocked return
air
Check condensate pan for high water level. Check air filter
and return air ductwork for blockage. Check that there is
adequate space between the return air opening and walls or
other obstructions on free return applications.
X
X
Is fault LED Blinking
5 times?
Brown out fault - low
supply voltage
Check primary voltage - ensure it is within the limits listed on
the unit data plate.
Brown out fault -
overloaded control
circuit
Check control voltage - if it is below 18 V check accessories
connected to the unit and ensure that they do not exceed the
VA draw shown on page 41.
Brown out fault - bad
thermostat connection
Check that thermostat wiring is proper gage and length, that it
is not damaged and that all connections at the thermostat and
heat pump are secure.
X
Is fault LED Blinking
6 times?
Freeze fault, air coil - no or low
airflow
Check fan motor for proper operation.
Check air filter.
Inspect air coil for dirt/debris.
Check ductwork - are dampers closed or blocked?
Freeze fault, air coil - blocked
return air
Check that there is adequate space between the return air
opening and walls or other obstructions on free return
applications.
Freeze fault, air coil - low
refrigerant
Check refrigerant pressure with gage set.
X
X
No fault LED -
contactor not
energized
Thermostat not calling for
compressor operation
Ensure that the thermostat is on and calling for "Y".
Bad thermostat connection
Check "Y" connection from thermostat. Ensure that there is 24
VAC between "Y" and "C".
Loose wire to contactor coil
Check wiring - ensure that there is 24 VAC across the
contactor coil.
Burned out contactor coil
Test contactor with 24VAC (between "R" and "C"). Ohm
contactor coil - an open circuit indicates a burned coil.
X
X
No fault LED -
contactor energized
Open compressor
overload
Check for supply voltage at the load side of the contactor. For
3 phase models check phase rotation and voltage at all 3
phases.
Poor wiring connections
Look for signs of heat on the wiring insulation. Check that all
wiring connections are secure and properly torqued.
Burned out compressor
Does compressor hum when power is applied? If not check
the resistance of the compressor windings using the values
shown in the compressor characteristics chart. Note that the
compressor must be cool (70°F) when checking the windings.
No compressor or
fan
operation
X
X
Power LED on
Bad thermostat
connection / faulty
thermostat
Check thermostat and wiring. Check unit terminal block for 24
VAC between "Y" and "C" and "G" and "C".
Power LED off
Low or no supply power
Ensure that the supply voltage to the unit is with in the range
shown on the unit data plate.
Faulty control transformer
Check for 24 VAC between "R" and "C" on the unit terminal
block. For 75 and 100 VA transformers, check that the
transformer circuit breaker has not tripped. Check low voltage
circuit for overload conditions or short circuits before replacing
the transformer.
Содержание AQUAZONE 50PSH
Страница 17: ...17 Fig 15 PSC Motor Single Phase Single Stage WSHP Open Control ...
Страница 20: ...20 Fig 18 Constant Torque Motor Single Phase Single Stage WSHP Open Control ...
Страница 23: ...23 Fig 21 Constant Airflow Single Phase WSHP Open ...
Страница 26: ...26 Fig 24 PSC Motor Three Phase Single Stage WSHP Open ...
Страница 29: ...29 Fig 27 Constant Torque Motor Three Phase Single Stage WSHP Open ...
Страница 32: ...32 Fig 30 Constant Airflow Motor Three Phase Single Stage WSHP Open ...