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507388-01
Issue 1732
to extend into the bottom of the box. Pull the leads
through the knock-out and into the box. Remove a
knock-out for the main power supply leads.
3. Secure the junction box to the top panel using screws.
4. Connect the unit wiring leads to the main power supply
or the switch as desired. Securely attach the cover to
the junction box. When complete, the junction box
should be as shown in Figure 6.
5. The rear cover that was removed in Step 1 is not used
and may be discarded.
Rear Cover
Front Cover
(Leave in place)
Figure 4.
Junction Box
Use Screws to secure
Junction box
No Gap
Remove Knock-out over opening, pull unit wiring leads through
Figure 5.
Figure 6.
Thermostat
Install the thermostat according to the directions furnished
with it. The thermostat must be located on an inside wall
where it will not be affected by drafts, sunlight, or any other
heat producing appliances. Connect the thermostat wires
to the low voltage leads on top of the unit following the
wiring diagram attached to the unit. The heat anticipator
setting is 0.50 amp.
Air Filter
All indoor return air must be filtered. A permanent-type
filter is furnished with the unit, located directly behind the
access panel. Removing the panel permits access to the
filter. See Figure 3.
If an installation is made in which it is more desirable to
mount the filter exterior to the unit, in the return duct work
or elsewhere, the permanent filter can be used or replaced
with a disposable filter. If a disposable filter is used, refer
to the information provided in Table 1 when sizing the
disposable filter.
Model Number
Filter Area
(sq. in.)
HWC8-12
300
HWC8-18
480
HWC8-24
480
HWC8-30
480
Table 1. Minimum Required Surface Area for
Disposable Filters
