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Moisture
Check -- To
perform moisture check:
•
Check that connectors
are orientated
"down" (or as recom-
mended by equipment manufacturer).
•
Arrange harnesses with "drip loop" under motor.
•
Check if condensate
drain is plugged.
•
Check for low airflow (too much latent capacity).
•
Check for undercharged
condition.
•
Check and plug leaks in return ducts, cabinet.
Table 31 -- Good Practices
DO
Check motor, controls wiring, and connections
thoroughly before replac-
ing motor.
Orient connectors down so water cannot get in. Install "drip loops."
Use authorized motor and control model numbers for replacement.
Keep static pressure to a minimum by:
•
Using high efficiency, low-static filters.
•
Keeping filters clean.
•
Designing ductwork for minimum static and maximum comfort.
•
Improving ductwork when replacement is necessary.
Size equipment wisely.
Check orientation before inserting motor connectors.
DO NOT
Automatically
assume the motor is bad.
Locate connectors
above 7 and 4 o'clock positions.
Replace one motor or control model number with another (unless
replacement
is authorized).
Use high pressure drop filters.
Use restricted returns.
Oversize system then compensate
with low airflow.
Plug in power connector backwards.
Force plugs.
Table 32 -- WSHP Troubleshooting
FAULT
HEATING
COOLING
Main Power Problems
X
X
HP Fault -- Code 2
High Pressure
X
X
x
LP/LOC Fault -- Code 3
X
Low Pressure/Loss
of
X
Charge
FP1 Fault -- Code 4
X
Water Freeze Protection
FP2 Fault -- Code 5
Air Coil Freeze Protection
X
X
Condensate
Fault-
Code 6
LEGEND
LED
-- Light-Emitting Diode
RV
-- Reversing Valve
TXV
x
x
x
x
x
x
x
x
x
x
x
x
POSSIBLE
CAUSE
Green Status LED Off
Reduced or no water flow in cooling
Water temperature
out of range in
cooling
Reduced or no airflow in heating
Air temperature out of range in heating
Overcharged
with refrigerant
Bad HP switch
Insufficient
charge
Compressor
pump down at start-up
Reduced or no water flow in heating
Inadequate antifreeze
level
Improper freeze protect setting (30 F
vs 10 F)
Water temperature
out of range
Bad thermistor
Reduced or no airflow in cooling
Air temperature
out of range
Improper freeze protect setting (30 F
vs 10 F)
Bad thermistor
Blocked drain
Improper trap
Poor drainage
Moisture on sensor
SOLUTION
Check line voltage circuit breaker and disconnect.
Check for line voltage between
L1 and L2 on the contactor.
Check for 24 vac between
R and C on controller.
Check primary/secondary
voltage on transformer.
Check pump operation or valve operation/setting.
Check water flow adjust to proper flow rate.
Bring water temperature
within design parameters.
Check for dirty air filter and clean or replace.
Check fan motor operation and airflow restrictions.
Dirty air coil -- construction
dust etc.
External static too high. Check blower performance
per Tables 9-13.
Bring return-air temperature
within design parameters.
Check superheat/subcooling
vs typical operating condition per
Tables 20-23.
Check switch continuity
and operation.
Replace.
Check for refrigerant
leaks.
Check charge and start-up water flow.
Check pump operation or water valve operation/setting.
Plugged strainer or filter. Clean or replace.
Check water flow adjust to proper flow rate.
Check antifreeze density with hydrometer.
Clip JW2 jumper for antifreeze (10 F) use.
Bring water temperature
within design parameters.
Check temperature
and impedance
correlation.
Check for dirty air filter and clean or replace.
Check fan motor operation and airflow restrictions.
External static too high. Check blower performance
per Tables 9-13.
Too much cold vent air. Bring entering air temperature
within design
3arameters.
Normal airside applications
will require 30 F only.
Check temperature
and impedance
correlation.
Check for blockage and clean drain.
Check trap dimensions
and location ahead of vent.
Check for piping slope away from unit.
Check slope of unit toward outlet.
Poor venting. Check vent location.
Check for moisture shorting to air coil.
--
Thermostatic
Expansion
Valve
52
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