Series - Heat Controller HTV Series Installation, Operation & Maintenance Manual

Installation, Operation & Maintenance
Performance Troubleshooting
Performance Troubleshooting
Insuffi cient capacity/ Not
cooling or heating
High Head Pressure
Low Suction Pressure
Low Discharge Air Temperature
in Heating
High humidity
HTV/HTD/HTH SERIES
Htg Clg Possible Cause
X X Dirty fi lter
X Reduced or no air fl ow in heating
X Reduced or no air fl ow in cooling
X X Leaky duct work
X X Low refrigerant charge
X X Restricted metering device
X Defective reversing valve
X X Thermostat improperly located
X X Unit undersized
X X Scaling in water heat exchanger
X X Inlet water too hot or too cold
X Reduced or no air fl ow in heating
X Reduced or no water fl ow 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 fl ow in heating.
X Water temperature out of range.
X Reduced air fl ow in cooling.
X Air temperature out of range
X X Insuffi cient charge
X Too high of air fl ow
X Poor performance
X Too high of air fl ow
X Unit oversized
Solution
Replace or clean.
Check for dirty air fi lter and clean or replace.
Check fan motor operation and airfl ow restrictions.
Too high of external static. Check static vs. blower table.
Check for dirty air fi lter and clean or replace.
Check fan motor operation and airfl ow restrictions.
Too high of external static. Check static vs. blower table.
Check supply and return air temperatures at the unit and at distant duct registers
if signifi cantly different, duct leaks are present.
Check superheat and subcooling per chart.
Check superheat and subcooling per chart. Replace.
Perform RV touch test.
Check location and for air drafts behind stat.
Recheck loads & sizing. Check sensible clg. load and heat pump capacity.
Perform scaling check and clean if necessary.
Check load, loop sizing, loop backfi ll, ground moisture.
Check for dirty air fi lter and clean or replace.
Check fan motor operation and air fl ow restrictions.
Too high of external static. Check static vs. blower table.
Check pump operation or valve operation/setting.
Check water fl ow. Adjust to proper fl ow rate.
Check load, loop sizing, loop backfi ll, ground moisture.
Bring return air temperature within design parameters.
Perform scaling check and clean if necessary.
Check superheat and subcooling. Re-weigh in charge.
Vacuum system and re-weigh in charge.
Check superheat and subcooling per chart. Replace.
Check pump operation or water valve operation/setting.
Plugged strainer or fi lter. Clean or replace.
Check water fl ow. Adjust to proper fl ow rate.
Bring water temperature within design parameters.
Check for dirty air fi lter and clean or replace.
Check fan motor operation and air fl ow restrictions.
Too high of external static. Check static vs. blower table.
Too much cold vent air? Bring entering air temperature within design parameters.
Check for refrigerant leaks.
Check fan motor speed selection and air fl ow chart.
See 'Insuffi cient Capacity'
Check fan motor speed selection and airfl ow chart.
Recheck loads & sizing. Check sensible clg load and heat pump capacity.
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Heat Controller, Inc.