IMPORTANT: Always refer
to the wiring diagrams that
came with your dryer to lo-
cate specific electrical com-
ponents. Illustrations in the
User Guide are intended to
be representative only.
Checking Heater Solid State Relays
1 Disconnect and lockout the main power supply.
2 Open the electrical enclosure.
3 Locate the regeneration solid state relays. Refer to the wiring diagrams that came with
your dryer.
4 Turn power on to the machine.
5 Start the dryer.
6 Measure voltage across the high voltage connections using a voltmeter. When
relay is energized, as indicated by the LED (green) voltage should be read 0 (zero).
When relay is de-energized, LED off, full voltage should be measured across the
relay. When relay is off, if voltage reads zero, relay is bad and needs replaced. Re-
peat this procedure for each relay.
CAUTION: Always disconnect and lock out the main power sources before making electrical
connections. Electrical connections should be made only by qualified personnel.
0
NOTE: Measure voltage using a voltmeter across the two high voltage connections of each
relay. (Shown here circled in red.)
Regeneration heater
solid state relays
Process heater
solid state relays
6
Troubleshooting
Troubleshooting l 6-31
IMPORTANT: Only qualified
personnel should take
measurements on energized
equipment. Follow all local,
regional, and company
guidelines regarding safe
electrical testing proce-
dures.
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