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Maintenance
sequence of operation
Light
Cook Done
Vent
Cooling Fan
Hot Air
Hot Air
Enable
Hot Air
Contactor
Spritzer
Figure 16
When the Control is first turned on, it begins to Preheat
the oven to 350?F by enabling the following relays. The
activated relays are associated with red LEDs which will
turn on when the control sends a call to the relay. Relays
are designated with a K, LEDs are designated with a D,
and Junctions are labeled with a J. In preheat the follow-
ing LEDs will be lit:
D25 LED will come on as the Light relay, K6, is closed.
The cavity lights will remain on until the Light button is
pressed to turn them off. Check for 24 VDC output at J3.4,
which feeds the cavity lights on the red wire.
D31 LED will be lit as the Hot Air (Power On) relay is
enabled on this unit. The Hot Air relay is active whenever
the red light is on at the Power Button. Check for 24 VDC
output from K3 at J6.4 on the orange wire, which jumps to
the common for the K2 relay at J6.7. The K2 relay waits
for input from the Fan@Speed or Drive@Set Speed Re-
lay, which is 24 VDC return at the grey wire in J11.4.
D35 LED shows the Hot Air Enable relay is activated when
the Fan@Speed Relay is closed at the Inverter sending
24 VDC return in at J11.4; this signal closes K2. Check for
24 VDC output at J6.8 on the blue wire, which jumps to
J20.1. J20.1 is the common to the K1 relay.
D37 LED is lit as the Hot Air Contactor relay is enabled
when there is a call for heat. A call for heat is generated
when the cavity probe(or core probe when not in preheat)
reads resistance/temperature below the current set point,
which is 350?F during preheat. Check for 24 VDC at
J20.2, which is the K1 relay output that feeds the contac-
tor coil on the orange wire.
Also in preheat, the control will call for Fan High Speed
Forward by sending 23 VDC return on J2.10 and J2.11,
and 0 VDC on J2.9 and J2.12. Note: outside the ready
band, which is-10 to +25?F, in relationship to the set
point, the control automatically switches to high fan speed
and can be used only in high fan speed or turbo fan speed.
Once in ready band, all speeds are available.
32
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