Page 81
B-Unit Operation
-
C-Manual Supply Air VFD Bypass
IMPORTANT - All dampers must be open to prevent
damage to duct work and dampers.
Note - This section does not apply to units equipped with
optional automatic VFD bypass. That option will automat-
ically change from multi-stage air volume to constant air
volume operation in the event of VFD failure.
1 - WAIT AT LEAST
10 MINUTES
WARNING
ELECTRICAL SHOCK HAZARD.
STOP! Before you continue, make sure that power
capacitor in the VFD holds high voltage power for up
to 10 minutes after power has been disconnected.
2 -
VFD CONNECTORS
A96
SUPPLY AIR VFD
P247P246
POWER
IN, TO
VFD
POWER
OUT, TO
BLOWER
FIGURE 45
Note - The indoor blower motor will start as soon as
the main unit power is restored. In manual bypass,
the blower will run regardless of thermostat signals
until main unit power is turned o. Manual bypass is
meant for emergency operation only and not long-
term usage.
P247
DISCONNECT VFD BYPASS CONNECTORS
P246
P246
P247
POWER IN TO VFD
POWER IN TO VFD
POWER OUT, TO BLOWER
POWER OUT, TO BLOWER
PINK
WIRES
PINK
WIRES
FIGURE 46
CONNECT POWER DIRECTLY TO BLOWER
(BYPASS VFD)
P246
P247
POWER IN TO VFD POWER OUT, TO BLOWER
FIGURE 47
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