Repair & Replacement - Modine Manufacturing HEX5 Series Installation, Parts, Service, And Maintenance Manual

I. REPAIR & REPLACEMENT
WARNING
Disconnect heater from power supply at integral disconnect or fuse
box before opening enclosures or servicing heater.
IF INTEGRAL DISCONNECT IS BEING SERVICED, verify that
power has been disconnected at fuse box or main panel.
1. After repairing any component:
1.1 Check that electrical connections are correct and
secure (see Figure 9, page 10).
1.2 Remove any foreign material from enclosures
1.3 Install and secure all covers
1.4 Ensure that all fasteners are tight
1.5 Remove all foreign objects from heater
1.6 Ensure air exits through louvers and fan rotates
counterclockwise when viewed from rear of heater
(see Figure 14, page 19).
The heater core is vacuum charged and not field repairable.
2. Core
For core removal:
2.1 Remove cabinet bottom and element enclosure cover.
2.2 Disconnect all wires entering element enclosure (see
Figure 10, page 18).
2.3 Slightly loosen all cabinet bolts shown in Figure 10,
page 18, to prevent the core from binding.
2.4 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 11,
page 18).
2.5 To return core to factory, use crate supplied with
exchange core to protect the element terminals and
plate threads.
2.6 To reinstall, lift the core up into cabinet while an
assistant guides the element wires into the element
enclosure conduit.
2.7 Position the core and tighten the 3 core mounting
bolts. Tighten the remaining cabinet bolts.
Loosen bolts only, do
not remove.
Control Enclosure
Conduit
Figure 10
18 18
Lock the switch in the "OFF" (open) position and/or tag the
switch to prevent unexpected power application.
This heater should only be serviced by personnel with heating
and hazardous location equipment experience.
3. Temperature High Limit
3.1
3.2
3.3
Figure 11
Figure 12
Remove this core
mounting bolt &
two others on the
opposite side.
Control
Enclosure
Element Enclosure
Figure 13
Remove temperature high-limit assembly and
clean the inside of the thermowell (see Figure 12,
page 18). A clean thermowell will ensure good
thermal contact.
Use only a factory supplied temperature high-limit
to ensure safe operation. (Refer to the instructions
that accompany the replacement Temperature High
Limit Kit).
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 13, page 18).