Heat Controller HTV Series Installation, Operation & Maintenance Instructions Manual page 49

Heat Controller, Inc.
Performance Troubleshooting
Performance
Troubleshooting
High Head Pressure
Low Suction Pressure
Low Discharge Air
Temperature in Heating
High Humidity
HTV/HTD/HTH SERIES
PERFORMANCE TROUBLESHOOTING
Htg Clg Possible Cause
X Reduced or No Air Flow 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 Non-condensables in System
X X Restricted Metering Device
X Reduced Water Flow in Heating
X Water Temperature Out of Range
X Reduced Air Flow in Cooling
X Air Temperature Out of Range
X X Insufficient Charge
X Too High of Air Flow
X Poor Performance
X Too High of Air Flow
X Unit Oversized
Check for dirty air filter and clean or replace
Check fan motor operation and airflow restriction
Too high of external static. Check static valve
Check pump operation or valve operation/setting
Check water flow adjust to proper flow rate
Check load, loop sizing, loop backfill ground
Bring return air temp within design parameters
Perform scaling check and clean if necessary
Check superheat and subcooling. Reweight in
charge
Vacuum system and reweigh in charge
Check superheat and subcooling per chart
Check pump operation or water valve operation
Plugged strainer or filter. Clean or replace
Check water flow adjust to proper flow rate
Bring water temp within design parameters
Check for dirty air filter and clean or replace
Check fan motor operation and airflow restrictions
Too high of external static. Check static valve
Too much cold vent air? Bring entering air temp to
design parameters
Check for refrigerant leaks
Check fan motor speed selection and airflow
See 'Insufficient Capacity'
Check fan motor speed selection and airflow
Recheck loads & sizing check sensible clg load
pump capacity
48
45
Solution