Johnson Controls TCSC Series, Installation Operation & Maintenance, Page: 40 / 46

JOHNSON CONTROLS 40
FORM 130.13-NOM8 (1021)
GENERAL TROUBLESHOOTING GUIDELINES
FOR COMPONENT-SPECIFIC TROUBLESHOOTING, REFER TO THE COMPONENT IOM APPENDIX ON P. XX
TROUBLESHOOTING GUIDELINES
PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION
Motor Fails to Start
Blown fuse or open circuit breaker
Replace fuse or reset circuit breaker; verify and correct source
of overload.
Shipping Cardboard insert in fan wheel Remove insert and restart
Improper wiring connections Check wiring with diagram supplied on unit
Improper current supply
Compare actual supply power with motor nameplate recommen-
dations. Contact power company for adjustments.
Mechanical failure
Check motor and confirm rotates freely
Motor Overheats
Fan motor is clogged with dirt, preventing
proper ventilation
Remove fan cover, clean fan and replace cover. It may be nec-
essary to replace the fan motor.
Lack of required external static pressure Add required external static pressure
Motor/Blower Operating
In Reverse
Fan motor not energized prior to introduction
of air through primary air valve
Energize fan motor prior to introducing air through primary air
valve
Excessive Motor Noise
Motor mounting bolts loose Tighten motor mounting bolts
Fan wheel rubbing on fan housing Align wheel in housing
Loose fan wheel Align and tighten
Motor SCR set too low Readjust motor speed SCR
Low Coil Capacity
Incorrect airflow
Check fan operating conditions
Incorrect GPM Check water pumps, valves and lines for obstructions
Dirty coil fins Clean coil fins
Dirty filter (where applicable) Replace filter
Incorrect water temperature Provide proper water temperature
Heater Does Not Op-
erate
No Power Check disconnect switch
No Control Voltage
Check transformer and transformer fusing (if applicable).
Replace if necessary.
Blown Fuse Replace fuse
Open Limit (primary or secondary)
Replace limits or reset as applicable
Check for continuity across limit to determine if open, replace as
necessary
Airflow Incorrect Direction
Check sensing tube, red tube = high and black tube = low, rotate
if needed. Check for kinks, replace if needed
Low External Static Pressure
Increase airflow to obtain a minimum of .1 in. w.c. external static
Damaged elements Check for open or damaged elements and replace as necessary
Low or High Tempera-
ture Rise
Incompatible Thermostat or Controller
Check wiring
Check for compatibility
Problems with Additional Stages
Check location of thermostat; might be installed in a “too hot” or
“too cold” location. Check heat outputs on controller
Check contactors for open coil
Check for damaged elements
Incorrect CFM Check for blocked duct or location of heater
Heater with SSR Does
Not Operate
Incorrect Signal Applied Verify signal input
Interface Board Fuse Blown Replace fuse