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Project Complaints/Conditions*
Problem Possible Cause Corrective Actions
Poor Cooling
Refrigerant Leak
Check for refrigerant leaks in all refrigerant components. Repair leaks (as needed) per standard refrigera-
tion practices
Improper charge
Check for proper refrigerant charge. Charge to proper subcooling according to condenser manufacturers
instructions
Evaporator coil dirty Check for a dirty evaporator coil. Clean evaporator coil using only evaporator approved cleaning solutions
Return air filter is dirty If the return air filter is dirty. Inspect, clean or replace as needed
Low airflow
Inspect ductwork for damage or leakage of airflow. Repair as needed
Adjust fan speed (per this manual) for each outlet to achieve a minimum of 33 cfm/outlet
Add more outlets if required (minimum of 7/ton)
Improperly sized equipment.
Verify required Btu's by performing a heat loss calculation for the space. Compare to the equipment in-
stalled.
Blower Will
Not Run
No call from thermostat at board See "No Thermostat Call Displayed on Board" flowchart for troubleshooting steps
Coil not at temps
The blower will not start unless the proper coil temp for the thermostat call (heating or cooling) See "Coil
not at proper temps" flowchart for more troubleshooting steps
Verify proper voltage
Using the wiring diagram in this manual, identify the line voltage terminals going to the blower. Using a cali-
brated voltmeter, verify proper voltage to blower. 240v is standard, if unit has been converted for 115v then
115v should be applied to the blower. See "Improper voltage" flowchart for more troubleshooting steps
Static Pressure Hose may be
kinked
From the main screen on the display, press the "up" or "down" keys to find "S.P" reading. If blower is not
running and the screen is displaying a measure reading, then hose is kinked. Trace hose to locate the
kink and repair. If hose is not kinked, replace control board
Unit not commissioned properly Using the menu tree in this manual, verify the unit has been commissioned properly for the application.
Unit speed or static pressue set
point set incorrectly
Using the menu tree in this manual, verify that the blower is set to the proper speed or SP set point for
the appropriate thermostat input. Y1, G, Y2 etc…
Control Board not
powered
Improper Voltage
Ensure all wiring is proper per wiring diagrams. The board requires 24v from transformer to power up.
Repair as needed. See flowcharts "No thermostat call" and "Improper voltage" in this manual for more
troubleshooting steps.
Faulty Control Board If wiring has been confirmed to be good, no loose connections, then replace control board.
Auxilliary terminal
not closing
Improper commissioning
Using the menu tree in this manual, verify the auxilliary terminals have been commissioned to close per
the desired thermostat call.
Faulty Control Board
If board is properly commissioned, and LED light for auxilliary terminal is illuminated, then replace control
board.
Coil is freezing
No airflow See "Blower will not run" above.
Low airflow
Measure delivered airflow to the space and compare against "Required CFM's" table in this manual. If
low, adjust accordingly
Dirty air filter. Clean/replace as needed
Dirty evaporator coil. Clean as required
Inspect ductwork for damage or leakage of airflow. Repair as needed
Refrigerant Leak
Check for refrigerant leaks in all refrigerant components. Repair leaks (as needed) per standard refrigera-
tion practices
Improper charge
Check for proper refrigerant charge (with proper airflow established). Charge to proper subcooling ac-
cording to condenser manufacturers instructions
Sweating at
Supply Outlet
Air Leak at Supply Air Plenum Check taped joint at adapter. Tape joint properly if necessary.
Insulation at Outlet not Installed Check for insulation at the outlet. Make repairs if necessary.
Excessive Noise
at Terminator
High Supply Air Plenum Static
Pressure
Check static pressure and compare to the table provided in this manual. Check for and add flow restric-
tors as necessary in supply runs.
Check static pressure and compare to the table provided in this manual. If necessary, add additional outlets.
Sound Attenuating Tube not
Installed
Check for installation of sound attenuating tube. Where necessary, install sound attenuating tube.
Tight Radius in Sound Attenuating
Tube or in Supply Tubing
Check all tubig for tight radius. Where necessary, correct radius.
Incorrect Supply Tubing Length
Check that all supply tubing runs are 9ft minimum (including the 3ft sound atten. tube). Where necessary,
correct supply tubing length.
Improperly Balanced System Check that correct size orfices have been installed. If not, properly orfice supply tubing runs.
Excessive Noise
at Return Air Grill
Return Air Duct Not Installed
Properly
Check for minimum 90° bend in return air duct. If minimum requirement not met, correct the bend in the
return air duct to the 90° minimum.
Dirty Return Air Filter Remove and inspect the return air filter. Clean or replace filter as needed.
Excessive
Vibration
Foreign Matter in Blower Wheel Check for loose or damaged blower wheel. Replace Blower Assembly of necessary.
Blower Wheel Damaged or
Unbalanced
Remove and Inspect Blower Assembly. Remove and foreight matter and retest fan vibration.
* The table above explains the most common symptoms and solutions for SpacePak troubleshooting. Please reach out to technicalservice@spacepak.com if the
problem is not resolved using this table.
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