ClimateMaster Tranquility TSM Series - Performance Troubleshooting; Table

CLIMATEMASTER WATER-SOURCE HEAT PUMPS
TSM/TSL Vertical Stack
Rev.: January 18, 2021
ClimateMaster Water-Source Heat Pumps
76
Performance Troubleshooting
Performance Troubleshooting Htg Clg Possible Cause Solution
Insu󰀩cient capacity/ Not
cooling or heating
X X Dirty lter Replace or clean.
X Reduced or no air ow in heating
Check for dirty air lter and clean or replace.
Check fan motor operation and airow restrictions.
Too high of external static. Check static vs. blower table.
X Reduced or no air ow in cooling
Check for dirty air lter and clean or replace.
Check fan motor operation and air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 signicantly di󰀨erent, 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 backll, ground moisture.
High Head Pressure
X Reduced or no air ow in heating
Check for dirty air lter and clean or replace.
Check fan motor operation and air ow restrictions.
Too high of external static. Check static vs. blower table.
X Reduced or no water ow in cooling
Check pump operation or valve operation/setting.
Check water ow. Adjust to proper ow rate.
X Inlet water too hot Check load, loop sizing, loop back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 ow in heating.
Check pump operation or water valve operation/setting.
Plugged strainer or lter. Clean or replace.
Check water ow. Adjust to proper ow rate.
X Water temperature out of range. Bring water temperature within design parameters.
X Reduced air ow in cooling.
Check for dirty air lter and clean or replace.
Check fan motor operation and air 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 Insu󰀩cient charge Check for refrigerant leaks.
Low Discharge Air Temperature
in Heating
X Too high of air ow Check fan motor speed selection and air ow chart.
X Poor performance See ‘Insu󰀩cient Capacity’
High humidity
X Too high of air ow Check fan motor speed selection and air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 o󰀨 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
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 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.