Troubleshooting - Carrier AQUAZONE 50PTH Installation And Service Instructions Manual

FAULT HEATING
High Head Pressure
Low Suction Pressure
Low Discharge Air
Temperature in Heating
High Humidity
Low Refrigerant Suction
Pressure
High Refrigerant Superheat
High Refrigerant
Subcooling
TXV and/or Low Pressure
Tubing Frosting
Equalizer Line Condensing
or Frosting
LEGEND
LED — Light-Emitting Diode
RV — Reversing Valve
TXV — Thermostatic Expansion Valve
Table 32 — WSHP Troubleshooting (cont)
COOLING POSSIBLE CAUSE
X Reduced or no airflow in heating
X Reduced or no water flow in
cooling
X Inlet water too hot
X Air temperature out of range in
heating
X Scaling in water heat exchanger
X X Unit overcharged
X X Noncondensables in system
X X Restricted metering device
X Reduced water flow in heating
X Water temperature out of range
X Reduced airflow in cooling
X Air temperature out of range
X X Insufficient charge
X Too high airflow
X Poor performance
X Too high airflow
X Unit oversized
X Normal operation
X Reduced water flow
X Water temperature out of range
X Scaling in water to refrigerant
heat exchanger
X Reduced airflow
X X Return air temperature below
minimum
X Supply air bypassing to return air
stream (zone systems).
X X Insufficient refrigerant charge
X X Improperly located TXV sensing
bulb
X X Failed or restricted metering
device
X X Insufficient refrigerant charge
X X Improperly located TXV sensing
bulb
X X Failed or restricted metering
device
X X Excessive refrigerant charge
X X Failed or restricted metering
device
X Normal operation
X X Insufficient refrigerant charge
X X Failed or restricted metering
device
X X Failed or restricted metering
device
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.
Check pump operation or valve operation/setting.
Check water flow adjust to proper flow rate. See Tables 19 and 24.
Check load, loop sizing, loop backfill, ground moisture.
Bring return-air temperature within design parameters.
Perform condenser cleaning.
Check superheat and subcooling. Reweigh in charge.
Remove refrigerant, evacuate system and charge unit.
Check superheat and subcooling per Tables 20-23. Replace.
Check pump operation or water valve operation/setting.
Plugged strainer or filter. Clean or replace.
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.
External static too high. Check blower performance per Tables 9-13.
Too much cold vent air. Bring entering air temperature within design
parameters.
Check for refrigerant leaks.
Check blower performance per Tables 9-13.
See "Insufficient Capacity."
Check blower performance per Tables 9-13
Recheck loads and sizing check sensible cooling load and heat pump
capacity.
Check/compare with unit Installation Manual for typical operating temper-
atures and pressures chart.
Check pump operation.
Check strainer or filter.
Improper flow regulator.
Bring water temperature within proper range.
Conduct water quality analysis.
Check for dirty air filter.
Check for dirty air coil.
Check fan motor operation.
External static pressure exceeds fan operating parameters.
Space temperature too cold.
Excessive fresh air.
Check for leaking ductwork.
Locate and repair leak.
Locate bulb on suction line between reversing valve and compressor.
Failed TXV power head, capillary or sensing bulb.
Plugged TXV strainer.
Locate and repair leak.
Locate bulb on suction line between reversing valve and compressor.
Failed TXV power head, capillary or sensing bulb.
Plugged TXV strainer.
Remove refrigerant as needed.
Failed TXV power head, capillary or sensing bulb.
Plugged TXV strainer.
May occur when entering water temperature is close to minimum.
Locate and repair leak.
Failed TXV power head, capillary or sensing bulb.
Plugged TXV strainer.
Failed TXV power head, capillary or sensing bulb.
Plugged TXV strainer.
53
SOLUTION