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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.
Unit with Fuse and VFD
Control
Box
Ground
Unit without VFD
Control
Box
Ground
46
If there is an occasion where the VFD has malfunctioned
and temporary cooling/operation is required, bypass the
VFD as shown in Fig. 39.
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
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
7. Connect the ground wire from the indoor fan motor to
8. Restore power.
Fuse
Fuse
Fig. 39 — To Bypass VFD
Specifications subject to change without notice.
indoor fan motor.
indoor fan motor.
the fan deck.
VFD
Fan Deck
Indoor
Fan
Motor
Indoor
Fan
Motor
Fan Deck
FAS-FHS-240-336-02SI
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