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Bypass the VFD
WARNING
Bypassing the VFD is not recommended. This is a
temporary procedure to provide cooling or heating
operation when a new VFD is required. When in this
bypass mode the fire shut down will not turn off the
blower and it will continue to run. The bypass should
only be used for a short duration until a new VFD has
been received.
The factory-installed VFD is wired and agency approved as
outlined in this manual. This VFD is utilized to help provide
added efficiencies and comfort during the cooling operation.
If there is an occasion where the VFD has malfunctioned
and temporary cooling/operation is required, bypass the
VFD as shown in Fig. 35.
To bypass VFD:
1. Turn off and lock out unit power.
2. Disconnect the connector linking the fuse to the VFD.
3. Disconnect the connector between the VFD and the
indoor fan motor.
4. Disconnect the ground wires at the base of the VFD.
5. Remove the VFD, if required.
6. Connect the lead from the fuse to the lead from the
indoor fan motor.
Unit with Fuse and VFD
Control
Box
Ground
Unit without VFD
Control
Box
Ground
36
7. Connect the ground wire from the indoor fan motor to
8. Restore power.
Condensate Drains
Keep condensate drains free of dirt and foreign matter.
Return-Air Filters
Refer to Replacing Filters section on page 37 for filter ac-
cessibility and removal. Replace with clean filters of the siz-
es listed in Tables 1-4.
Coil Removal
Remove unit panels and corner posts as required. Discon-
nect coil connections and remove fastening screws. Re-
move coil through end or side sections of unit.
Cleaning Cooling Coil
Remove return-air filters. Remove any heavy dirt that may
have accumulated on underside of coil. Coil can be cleaned
more easily with a stiff brush, vacuum cleaner, or com-
pressed air when coil is dry. If coil is wet or if water is to be
used for cleaning, guard against splashing water on electri-
cal components or damaging surrounding area. Clean coil
baffles as applicable and check for tight fit to be sure air
does not bypass coil.
Cleaning Insulation
The insulation contains an immobilized antimicrobial agent
that helps inhibit the growth of bacteria and fungi. Clean the
inner surface of the insulation according to the separate
maintenance instructions shipped with the unit.
Fuse
Fuse
Fig. 35 — To Bypass VFD
Specifications subject to change without notice.
the fan deck.
VFD
Fan Deck
Indoor
Fan
Motor
Indoor
Fan
Motor
Fan Deck
FASFHS150-180-01SI
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