ClimateMaster DC Series Installation Manual download pdf (Page 48)

Residential H&V - 60Hz R22 &R410A

Rev.: 22 Dec, 2008

Water-Source Heating and Cooling Systems

Functional Troubleshooting

Performance Troubleshooting

Fault Htg Clg Possible Cause Solution

Main power Problems X X Green Status LED Off Check Line Voltage circuit breaker and disconnect

Check for line voltage between L1 and L2 on the contactor

Check for 24VAC between R and C on CXM/DXM

Check primary/secondary voltage on transformer

HP Fault-Code 2 X Reduced or no water flow Check pump operation or valve operation/setting

High pressure in cooling

Check water flow adjust to proper flow rate

Water Temperature out of range in

cooling

Bring water temp within design parameters

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

in heating Check fan motor operation and airflow restrictions

Dirty Air Coil- construction dust etc.

Too high of external static. Check static vs blower table

Air Temperature out of range in

heating

Bring return air temp within design parameters

Overcharged with refrigerant

Check superheat/subcooling vs typical operating condition

table

Bad HP Switch Check switch continuity and operation. Replace

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

Section 10 - Packaged IOM 48 4/24/09 3:16:55 PM

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ClimateMaster DC Series Installation Manual Page 48

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