TP-6805 8/1566 Section 5 Troubleshooting
5.7 Thermostat
Model 20RESB, 20RESC(L), and 20RESD generator
sets include a resettable thermostat that detects excess
heat inside the enclosure. If the thermostat trips, the
generator will shut down and the controller will display a
fault (underspeed, underfrequency, or undervoltage). If
the thermostat trips, check for blocked air inlets and
exhaust outlets. Then follow the instructions below to
reset the thermostat.
Observe the following safety precautions while resetting
the thermostat.
Hazardous voltage.
Will cause severe injury or death.
Disconnect all power sources before
opening the enclosure.
DANGER
Accidental starting.
Can cause severe injury or death.
Disconnect the battery cables before
working on the generator set.
Remove the negative (--) lead first
when disconnecting the battery.
Reconnect the negative (--) lead last
when reconnecting the battery.
WARNING
Disabling the generator set. Accidental starting can
cause severe injury or death. Before working on the
generator set or connected equipment, disable the generator
set as follows: (1) Move the generator set master switch to the
OFF position. (2) Disconnect the power to the battery charger.
(3) Remove the battery cables, negative (--) lead first.
Reconnect the negative (--) lead last when reconnecting the
battery. Follow these precautions to prevent starting of the
generator set by an automatic transfer switch, remote
start/stop switch, or engine start command from a remote
computer.
Hot engine and exhaust system.
Can cause severe injury or death.
Do not work on the generator set until
it cools.
WARNING
Servicing the exhaust system. Hot parts can cause
severe injury or death. Do not touch hot engine parts. The
engine and exhaust system components become extremely
hot during operation.
Procedure to Reset the Thermostat
See Figure 5-6 or Figure 5-7 for the thermostat location.
1. Disconnect the utility power to the generator by
opening (turning OFF) the corresponding circuit
breaker at the building’s distribution panel.
2. Open the enclosure roof and secure it with the roof
stay on the left side of the enclosure.
3. 20RESC(L) Models: Remove the service door
from the right side of the enclosure by removing the
plug and two screws. Lift the door up and off. Then
remove four screws and remove the front panel.
20RESB/20RESD Models: Remove the air intake
end panel.
4. Disconnect the generator set engine starting
battery(ies), negative (--) lead first.
5. Press the button on the thermostat to reset it.
6. Reconnect the generator set engine starting
battery, negative (--) lead last.
7. Replace the enclosure panels.
8. Reconnect utility power to the generator set b y
closing the circuit breaker in the distribution panel.
9. Reset the fault on the RDC2 controller. Refer to the
generator Operation Manual for instructions, if
necessary.
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