Functional Troubleshooting - Heat Controller HKV Installation, Operation & Mainenance Manual

Heat Controller, Inc. HKV LArge CommerCiAL
Only Compressor Runs
X
X
Only Compressor Runs X
X
X
X
X
Unit Doesn't Operate in
Cooling X
Unit Doesn't Operate in
Cooling
Performance
Htg Clg Possible Cause
Troubleshooting
Insufficient capacity/
X
Performance
Htg Clg Possible Cause
Not cooling or heating
X
Troubleshooting
properly
Insufficient capacity/
X
Not cooling or heating
X
properly
X
X
X
X
X
X
X
X
X
X
X
X
X
High Head Pressure
X
X
High Head Pressure
X
X
X
X
X
X
X
Low Suction Pressure
X
X
X
Low Suction Pressure X
X
X
X
Low discharge air
X
X
temperature in heating
X
Low discharge air
High humidity
X
temperature in heating
X
High humidity
X Thermostat wiring
X Fan motor relay
X Thermostat wiring
X Fan motor relay
X Fan motor
X Thermostat wiring
X Fan motor
X Reversing Valve
X Thermostat wiring
X Reversing Valve
X Thermostat setup
X Thermostat wiring
X Thermostat setup
Thermostat wiring
X
X Thermostat wiring
Thermostat wiring
X
X Dirty Filter
Reduced or no Air flow
in heating
X Dirty Filter
Reduced or no Air flow
X Reduced or no Air flow
in heating
in cooling
X Reduced or no Air flow
in cooling
X Leaky duct work
X Low refrigerant charge
X Leaky duct work
X Restricted metering device
X Defective Reversing Valve
X Low refrigerant charge
X Thermostat improperly located
X Restricted metering device
X Unit undersized
X Defective Reversing Valve
X Thermostat improperly located
X Scaling in water heat exchanger
X Unit undersized
X Inlet Water too Hot or Cold
X Scaling in water heat exchanger
Reduced or no Air flow
X in heating Inlet Water too Hot or Cold
Reduced or no Air flow
in heating
X Reduced or no water flow
in cooling
X Inlet Water too Hot
X Reduced or no water flow
Air Temperature out of range in
in cooling
heating
X Inlet Water too Hot
X Scaling in water heat exchanger
Air Temperature out of range in
X Unit Overcharged
heating
X Non-condensables insystem
X Scaling in water heat exchanger
X Restricted metering device
X Unit Overcharged
Reduced water flow
X Non-condensables insystem
in heating
X Restricted metering device
Reduced water flow
Water Temperature out of range in heating
X Reduced Air flow
in cooling Water Temperature out of range
X Reduced Air flow
X Air Temperature out of range
in cooling
X Insufficient charge
X Air Temperature out of range
Too high of air flow
X Insufficient charge
Poor Performance
X Too high of air flow
Too high of air flow
X Unit oversized
Poor Performance
X Too high of air flow
X Unit oversized
44
IOM Instructions

Functional Troubleshooting

Check G wiring at heat pump. Jumper G and R for fan
operation.
Jumper G and R for fan operation. Check for Line voltage
Check G wiring at heat pump. Jumper G and R for fan
across BR contacts.
operation.
Check fan power enable relay operation (if present)
Jumper G and R for fan operation. Check for Line voltage
Check for line voltage at motor. Check capacitor
across BR contacts.
Check thermostat wiring at heat pump. Jumper Y and R for
Check fan power enable relay operation (if present)
compressor operation in test mode.
Check for line voltage at motor. Check capacitor
Set for cooling demand and check 24VAC on RV coil and at
Check thermostat wiring at heat pump. Jumper Y and R for
CXM/DXM board.
compressor operation in test mode.
If RV is stuck, run high pressure up by reducing water flow
Set for cooling demand and check 24VAC on RV coil and at
and while operating engage and disengage RV coil voltage
CXM/DXM board.
to push valve.
If RV is stuck, run high pressure up by reducing water flow
Check for 'O' RV setup not 'B'
and while operating engage and disengage RV coil voltage
Check O wiring at heat pump. Jumper O and R for RV coil
to push valve.
'Click'.
Check for 'O' RV setup not 'B'
Put thermostat in cooling mode. Check for 24VAC on O
Check O wiring at heat pump. Jumper O and R for RV coil
(check between C and O); check for 24VAC on W (check
between W and C). There should be voltage on O, but not
'Click'.
on W. If voltage is present on W, thermostat may be bad
Put thermostat in cooling mode. Check for 24VAC on O
or wired incorrectly.
(check between C and O); check for 24VAC on W (check
between W and C). There should be voltage on O, but not
on W. If voltage is present on W, thermostat may be bad
Performance Troubleshooting
or wired incorrectly.
Solution
Replace or clean
Solution
Check for dirty air filter and clean or replace
Check fan motor operation and airflow restrictions
Replace or clean
Too high of external static. Check static vs blower table
Check for dirty air filter and clean or replace
Check for dirty air filter and clean or replace
Check fan motor operation and airflow restrictions
Check fan motor operation and airflow restrictions
Too high of external static. Check static vs blower table
Too high of external static. Check static vs blower table
Check for dirty air filter and clean or replace
Check supply and return air temperatures at the unit and at
Check fan motor operation and airflow restrictions
distant duct registers if significantly different, duct leaks
Too high of external static. Check static vs blower table
are present
Check supply and return air temperatures at the unit and at
Check superheat and subcooling per chart
distant duct registers if significantly different, duct leaks
Check superheat and subcooling per chart. Replace.
are present
Perform RV touch test
Check superheat and subcooling per chart
Check location and for air drafts behind stat
Check superheat and subcooling per chart. Replace.
Recheck loads & sizing check sensible clg load and heat
Perform RV touch test
pump capacity
Check location and for air drafts behind stat
Perform Scaling check and clean if necessary Recheck loads & sizing check sensible clg load and heat
pump capacity
Check load, loop sizing, loop backfill, ground moisture.
Perform Scaling check and clean if necessary
Check for dirty air filter and clean or replace
Check fan motor operation and airflow restrictions Check load, loop sizing, loop backfill, ground moisture.
Too high of external static. Check static vs blower table Check for dirty air filter and clean or replace
Check fan motor operation and airflow restrictions
Check pump operation or valve operation/setting
Check water flow adjust to proper flow rate Too high of external static. Check static vs blower table
Check load, loop sizing, loop backfill, ground moisture.
Check pump operation or valve operation/setting
Bring return air temp within design parameters Check water flow adjust to proper flow rate
Check load, loop sizing, loop backfill, ground moisture.
Perform Scaling check and clean if necessary
Check superheat and subcooling. Reweigh in charge Bring return air temp within design parameters
Vacuum system and reweigh in charge
Perform Scaling check and clean if necessary
Check superheat and subcooling per chart. Replace.
Check superheat and subcooling. Reweigh in charge
Check pump operation or water valve operation/setting
Vacuum system and reweigh in charge
Plugged strainer or filter. Clean or replace.
Check superheat and subcooling per chart. Replace.
Check water flow adjust to proper flow rate
Check pump operation or water valve operation/setting
Bring water temp within design parameters Plugged strainer or filter. Clean or replace.
Check water flow adjust to proper flow rate
Check for dirty air filter and clean or replace
Check fan motor operation and airflow restrictions Bring water temp within design parameters
Too high of external static. Check static vs blower table
Check for dirty air filter and clean or replace
Too much cold vent air? Bring entering air temp within
Check fan motor operation and airflow restrictions
design parameters
Too high of external static. Check static vs blower table
Check for refrigerant leaks
Too much cold vent air? Bring entering air temp within
design parameters
Check fan motor speed selection and airflow chart
Check for refrigerant leaks
See 'Insufficient Capacity'
Check fan motor speed selection and airflow chart
Check fan motor speed selection and airflow chart
Recheck loads & sizing check sensible clg load and heat
See 'Insufficient Capacity'
pump capacity
Check fan motor speed selection and airflow chart
Recheck loads & sizing check sensible clg load and heat
pump capacity