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Troubleshooting Guide
Raychem-IM-H57548-HWATsystem-EN 16/08
Symptom
Probable Causes
Corrective Action
Low or inconsistent
insulation resistance
Nicks or cuts in the heating cable.
Short between the braid and heating cable
core or the braid and pipe.
Arcing due to damaged heating-cable
insulation.
Moisture present in the components.
Test leads touching the junction box.
If heating cable is not yet insulated, visually inspect the entire
length for damage, especially at elbows and flanges and around
valves. If the system is insulated, remove the connection kits
one-by-one to isolate the damaged the section.
Replace damaged heating-cable sections.
If moisture is present, dry out the connections and retest. Be sure
all conduit entries are sealed, and that condensate in conduit
cannot enter power connection boxes. If heating-cable core or bus
wires are exposed to large quantities of water, replace the heating
cable. (Drying the heating cable is not sufficient, as the power
output of the heating cable can be significantly reduced.)
Clear the test leads from junction box and restart.
Symptom
Probable Causes
Corrective Action
Circuit breaker trips
Circuit breaker is undersized.
Connections and/or splices are shorting out.
Physical damage to heating cable is causing
a direct short.
Bus wires are shorted at the end.
Circuit lengths too long
Nick or cut exists in heating cable or power
feed wire with moisture present or moisture
in connections.
GFPD is undersized (5 mA used instead of
30 mA) or miswired.
Recheck the design for startup temperature and current loads. Do not
exceed the maximum circuit length for heating cable used. Replace
the circuit breaker, if defective or improperly sized.
Visually inspect the RayClic connection systems. Replace if necessary.
Check for damage around the valves and any area where there may
have been maintenance work. Replace damaged sections of heating
cable.
Check the end seal to ensure that bus wires are not shorted. If a dead
short is found, the heating cable may have been permanently damaged
by excessive current and may need to be replaced.
Separate the circuit into multiple circuits that do not exceed max
circuit lengths.
Replace the heating cable, as necessary. Dry out and reseal the
connections and splices. Using a megohmmeter, retest insulation
resistance.
Replace undersized GFPD with 30 mA GFPD. Check the GFPD wiring
instructions.
