4 MAINTENANCE AND REPAIR
4-24
Therma-Flow
®
PLUS
IOM 09900002
Revision C 08/15/21
© 2021, Encon Safety Products, Inc.
WARNING:
Always disconnect the heater from the electrical power source before
performing any service or maintenance.
To replace the enclosure heater:
1. Switch off the main electrical power supply to Therma-Flow
®
Plus.
2. Remove the unilet cover
adjacent to the heater by turning it counter- clockwise
to access the wire connections.
3. Make note of the wire connections and disconnect the wires.
4. Remove the old heater and install the new heater in reverse order of removal.
5. Switch the electrical power on and ensure the heater starts when the
temperature goes below the thermostat setting.
WARNING:
Always disconnect the heater from the electrical power source before
performing any service or maintenance.
To maintain the heater:
1. Keep the heater clean, especially the heating elements. Ensure the heater is off
and cool to the touch, then remove dust, lint and accumulation of other material.
2. Never allow the heater to operate with restriction to the free circulation of air
through it.
3. Check that the heater has not been damaged or deformed and that all conduit
joints are secure.
Enclosure Heater Thermostat
The heater thermostat is located directly above the radiant heater (see Figure 4-
15). When the thermostat reaches the set cold set point, the circuit to the con-tactor
closes or opens to start or stop the heater. The thermostat is preset at 80°F
(26.7°C).
