REPAiR & REPLAcEMEnT
W A R n i n g
Disconnect power supply before opening enclosures or
servicing heater. Lock the switch in the “OFF” (open)
position and/or tag the switch to prevent unexpected
power application. Heater surfaces may be hot.
1. After repairing any component:
a.
check that electrical connections are correct and
secure (see Figure 8),
b.
remove any foreign material from enclosures,
c.
install and secure all covers,
d.
ensure that all fasteners are tight,
e. remove all foreign objects from heater, and
f.
ensure air exits through louvers and fan rotates
counterclockwise when viewed from rear of heater
(see Figure 13).
c O R E
The heater core is vacuum charged and not field
repairable. For core removal:
1. Remove cabinet bottom and element enclosure cover.
2. Disconnect all wires entering element enclosure (see
Figure 9).
3. Slightly loosen all cabinet bolts shown in Figure 9, to
prevent the core from binding.
4. With an assistant supporting the weight of the core,
remove the 3 core mounting bolts. carefully lower the
core out of the cabinet (see Figure 10).
5. To return core to factory, use crate supplied with exchange
core to protect the element terminals and plate threads.
6. To reinstall, lift the core up into cabinet while an assistant
guides the element wires into the element enclosure
conduit.
7. Position the core and tighten the 3 core mounting bolts.
Tighten the remaining cabinet bolts.
T E M P E R AT U R E H i g H - L i M i T
1. Remove temperature high-limit assembly and clean
the inside of the thermowell (see Figure 11). A clean
thermowell will ensure good thermal contact.
2. Use only a factory supplied temperature high-limit to
ensure safe operation.
3. Apply a small drop, 3/32” (2mm) diameter, of heat sink
compound to the center of the metal cap but do not
spread. This is critical for proper thermal contact between
the temperature high-limit and the thermowell (see Figure
11).
4. Reinstall the temperature high-limit assembly with
the snap ring and spring into the thermowell without
damaging the insulating tube. Secure in place with the
cotter pin (see Figure 12).
MOTOR, FAn & FAn gUARD
1. Remove bolts holding the motor to the motor mount. On
units with a built-in thermostat, remove the bolts on the
back of the thermostat enclosure.
2. Remove conduit #1 located between motor junction
box and control enclosure by turning it in the
direction illustrated (see Figure 13). note conduits #1 and
- 6 -
FigURE 13
FigURE 12
FigURE 11
FigURE 10
FigURE 9
}
Loosen
bolts
only,
do not
remove.
Loosen
bolts
only,
do not
remove.
Element
Enclosure
R e m ove t h i s
core mounting
b o l t & t w o
others on the
opposite side.
Rotation
Air inlet
conduit #2 conduit #1
Remove
install
Remove
install
3/32”
(2mm)
Drop
7/8” (22mm)
(From groove to
face of coupling)
Thermowell
control
Enclosure
conduit
Junction
Enclosure
