TENNEY ENVIRONMENTAL
Tenney Junior Test Chambers: Models TJR and TUJR, W942, or WF4
Page 44
This section does not propose to be a complete and comprehensive troubleshooting guide for the
serviceman. However, it attempts to help you locate the causes of possible troubles so that you can make
simple repairs or adjustments yourself. The information here should also help you in localizing trouble so that
you can better describe the malfunction when contacting the Tenney Service Department. Refer to the
appropriate electrical and refrigeration drawings when using these troubleshooting suggestions.
TENNEY JUNIOR TROUBLESHOOTING GUIDE
PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION
1. Conditioner fan dead
Motor shaft frozen Verify - rotate by hand carefully!
Defective motor Verify - feel for heat & measure
current
2. Insufficient Heat
Chamber door is ajar Close securely
One heater element is burned out Verify - measure current
Controller failure Carefully check programming
3. No Heat
Heat Limiter opened Replace
Heater elements burned out, or open Replace
Heat output failing to close Verify - Contact Tenney Service
Triac 1TRC failed open Replace
Open temperature sensor Replace
4. Excessive Heat
Triac 1TRC failed in conducting state
(usual failure mode)
Replace
Heat output failing to open Verify - Contact Tenney Service
Short circuited temperature sensor Replace
5. Refrigeration System Dead
Cooling output failing to close Verify - Contact Tenney Service
Triac 2TRC failing to conduct Replace
Compressor motor overload protector
has tripped
Wait for 5 minutes. If overload does
not close - replace it
6. Compressor hums but will not
start
Low line voltage Get proper electrical service
Starting capacitor is defective Replace
Compressor relay defective Replace
Internal compressor problem Measure winding resistance, test for
grounds, contact Tenney Service
7. Repeated shorting or blowing of
start capacitors
Excessive start time, voltage too low Correct low line voltage problem
22.0 CHAMBER TROUBLESHOOTING GUIDE
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