C L I M A T E M A S T E R W A T E R - S O U R C E H E A T P U M P S
TSL Vertical Stack
R e v. : 0 4 / 2 4 / 2 0 1 9
58
C l i m a t e M a s t e r Wa t e r - S o u rc e H e a t P u m p s
Performance Troubleshooting
PT ports would not be accessible on high rise units since the chassis and hose are inside the cabinet
and unit will not operate properly if opened up.
To check temperature - connect thermocouples to chassis supply and return tubes, close up unit, run
unit minimum of 15 minutes.
To check water fl ow through chassis - with unit off, pull chassis part way out, remove hose on chassis
return (right side), connect spare hose to chassis return with other end in bucket or vessel to collect the
water, open supply shutoff, time water (longer times will be more accurate) and then shutoff, measure
water and calculate GPM, reconnect cabinet hose and reassemble chassis.
Performance Troubleshooting
Htg Clg
Possible Cause
Solution
Insuffi cient capacity/ Not
cooling or heating
X
X
Dirty fi lter
Replace or clean.
X
Reduced or no air fl ow in heating
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.
X
Reduced or no air fl ow in cooling
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.
X
X
Leaky duct work
Check supply and return air temperatures at the unit and at distant duct registers
if signifi cantly 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 too cold
Check load, loop sizing, loop backfi ll, ground moisture.
High Head Pressure
X
Reduced or no air fl ow in heating
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.
X
Reduced or no water fl ow in cooling
Check pump operation or valve operation/setting.
Check water fl ow. Adjust to proper fl ow rate.
X
Inlet water too hot
Check load, loop sizing, loop backfi ll, ground moisture.
X
Air temperature out of range in heating
Bring return air temperature within design parameters.
X
Scaling in water heat exchanger
Perform scaling check and clean if necessary.
X
X
Unit overcharged
Check superheat and subcooling. Re-weigh in charge.
X
X
Non-condensables in system
Vacuum system and re-weigh in charge.
X
X
Restricted metering device.
Check superheat and subcooling per chart. Replace.
Low Suction Pressure
X
Reduced water fl ow in heating.
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.
X
Water temperature out of range.
Bring water temperature within design parameters.
X
Reduced air fl ow in cooling.
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.
X
Air temperature out of range
Too much cold vent air? Bring entering air temperature within design parameters.
X
X
Insuffi cient charge
Check for refrigerant leaks.
Low Discharge Air Temperature
in Heating
X
Too high of air fl ow
Check fan motor speed selection and air fl ow chart.
X
Poor performance
See ‘Insuffi cient Capacity’
High humidity
X
Too high of air fl ow
Check fan motor speed selection and airfl ow chart.
X
Unit oversized
Recheck loads & sizing. Check sensible clg load and heat pump capacity.
Modulating Valve
Troubleshooting
X
X
Improper output setting
Verify the AO-2 jumper is in the 0-10V position
No valve output signal
Check DC voltage between AO2 and GND. Should be O
when valve is off and between 3.3v and 10v when valve
is on.
No valve operation
Check voltage to the valve
Replace valve if voltage and control signals are present at
the valve and it does not operate
