ClimateMaster DC Series Installation Manual download pdf (Page 47)

Residential H&V - 60Hz R22 &R410A

Rev.: 22 Dec, 2008

climatemaster.com

Only Compressor Runs X X Thermostat wiring

Check G wiring at heat pump. Jumper G and R for fan

operation.

X X Fan motor relay

Jumper G and R for fan operation. Check for Line voltage

across BR contacts.

Check fan power enable relay operation (if present)

X X Fan motor Check for line voltage at motor. Check capacitor

X X Thermostat wiring

Check thermostat wiring at heat pump. Jumper Y and R for

compressor operation in test mode.

Unit Doesn't Operate in

Cooling

X Reversing Valve

Set for cooling demand and check 24VAC on RV coil and at

CXM/DXM board.

If RV is stuck, run high pressure up by reducing water flow

and while operating engage and disengage RV coil voltage

to push valve.

X Thermostat setup Check for 'O' RV setup not 'B'

X Thermostat wiring

Check O wiring at heat pump. Jumper O and R for RV coil

'Click'.

Performance

Troubleshooting

Htg Clg Possible Cause Solution

Insufficient capacity/ X X Dirty Filter Replace or clean

Not cooling or heating X Reduced or no Air flow Check for dirty air filter and clean or replace

properly in heating Check fan motor operation and airflow restrictions

Too high of external static. Check static vs blower table

X Reduced or no Air flow Check for dirty air filter and clean or replace

in cooling Check fan motor operation and airflow restrictions

Too high of external static. Check static vs blower table

X X Leaky duct work

Check supply and return air temperatures at the unit and at

distant duct registers if significantly different, duct leaks

are present

X X Low refrigerant charge Check superheat and subcooling per chart

X X Restricted metering device Check superheat and subcooling per chart. Replace.

X Defective Reversing Valve Perform RV touch test

X X Thermostat improperly located Check location and for air drafts behind stat

X X Unit undersized

Recheck loads & sizing check sensible clg load and heat

pump capacity

X X Scaling in water heat exchanger Perform Scaling check and clean if necessary

X X Inlet Water too Hot or Cold Check load, loop sizing, loop backfill, ground moisture.

High Head Pressure X Reduced or no Air flow Check for dirty air filter and clean or replace

in heating Check fan motor operation and airflow restrictions

Too high of external static. Check static vs blower table

X Reduced or no water flow Check pump operation or valve operation/setting

in cooling Check water flow adjust to proper flow rate

X Inlet Water too Hot Check load, loop sizing, loop backfill, ground moisture.

Air Temperature out of range in

heating

Bring return air temp within design parameters

X Scaling in water heat exchanger Perform Scaling check and clean if necessary

X X Unit Overcharged Check superheat and subcooling. Reweigh in charge

X X Non-condensables insystem Vacuum system and reweigh in charge

X X Restricted metering device Check superheat and subcooling per chart. Replace.

Low Suction Pressure X Reduced water flow Check pump operation or water valve operation/setting

in heating Plugged strainer or filter. Clean or replace.

Check water flow adjust to proper flow rate

X Water Temperature out of range Bring water temp within design parameters

X Reduced Air flow Check for dirty air filter and clean or replace

in cooling Check fan motor operation and airflow restrictions

Too high of external static. Check static vs blower table

X Air Temperature out of range

Too much cold vent air? Bring entering air temp within

design parameters

X X Insufficient charge Check for refrigerant leaks

Low discharge air

temperature in heating

X Too high of air flow Check fan motor speed selection and airflow chart

X Poor Performance See 'Insufficient Capacity'

High humidity X Too high of air flow Check fan motor speed selection and airflow chart

X Unit oversized

Recheck loads & sizing check sensible clg load and heat

pump capacity

Thermostat wiring

Put thermostat in cooling mode. Check for 24VAC on O

(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

or wired incorrectly.

Functional Troubleshooting

Section 10 - Packaged IOM 47 4/24/09 3:16:55 PM

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ClimateMaster DC Series Installation Manual Page 47

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