Johnson Controls TSS User Manual

JOHNSON CONTROLS
10
FORM 130.13-NOM1 (114)
ELECTRIC HEATER TROUBLESHOOTING GUIDE
JOHNSON CONTROLS AND TUTCO
TABLE 6 - HEATER TROUBLESHOOTING GUIDE
Check wiring diagrams to ensure that heater is properly wired.
SYMPTOM POSSIBLE CAUSE CORRECTIVE ACTION
HEATER DOES NOT OPERATE
No Power Check Disconnect.
No Control Voltage
Check Control Signal (i.e. 24 VAC).
Check transformer and transformer fus-
ing (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 de-
termine if open, replace as necessary.
Airow Incorrect Direction Check sensing tube, rotate if needed.
Low Airow Static Pressure Increase airow.
Damaged Elements
Check for open or damaged elements
and replace as necessary.
LOW OR HIGH TEMPERATURE RISE
Incompatible Thermostat or Controller
Check Wiring.
Check for compatibility.
Problems with Additional Stages
Check location of thermostat; may be
installed in a “too hot” or “too cold loca-
tion. Check heat outputs on controller.
Check contactors for open coil.
Check for damaged elements.
Incorrect CFM
Check for blocked duct or location of
heater.
SHORT CYCLING
Improper Airow
Check for even airow across the face
of the element section.
Check for blocked duct.
Verify installation per SMACNA and
ASHRAE guidelines.
Check for dirty lters.
Low CFM
See remedies for “Improper Airow”.
Check air velocity of 70 CFM per kW.
HEATER WITH SSR DOES NOT
OPERATE
Incorrect Signal Applied Verify signal input.
Interface Board Fuse Blown Replace fuse.
See SSR Troubleshooting (next page)

Johnson Controls TSS Specifications

General

Brand	Johnson Controls
Model	TSS
Category	Air Conditioner
Language	English