Viking DEDO127T Service Manual page 57

Diagnostics
Convection Fan Motor (Continued)
High speed reverse operation
FIG A shows the Convection Power relay (K5)
the Convection directional relay (K6) and Speed
relay (K7) activated. In the wiring configuration
shown here, the fan will run at HIGH speed and in a
clockwise rotation.
FIG B shows the current flow for HIGH speed
reverse. L1 Power flows through the N.O. contact
in the K5 relay (energized) to the common
terminal on the K6. The N.O. contact on K6 is
wired directly to the convection motor (Gray wire). K7 K6 K5
In reverse operation, the K6 relay is energized.
The N.O. contact of the K6 is internally connected
to the Common terminal of the K7.
L1 power flows through K6 to the K7 relay. The K7 Convection Convection Convection
is energized in HIGH speed so the power flows Speed Relay Directional Power Relay
through the N.O contact of the K7 relay. By-passing Relay
the LOW speed Capacitor, the power flows into the
HIGH speed Capacitor (orange wire).The power
then enters the HIGH speed capacitor for
HIGH speed reverse operation.
K7 K6 K5
CAUTION
The convection circuit utilizes capacitors
in its operation which can store a charge
for long periods of time. Be sure to
discharge the capacitors before servicing
the convection components.
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© 2008 Viking Preferred Service