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Maintenance
33
Sequence of Operation
Cook
Done
Vent
Hot Air
Hot Air
Enable
Hot Air
Contactor
Light
Cooling
Fan
Spritzer
Figure 16
When the Control is first turned on, it begins to
Preheat
the oven to 350?F by enabling the followĆ
ing 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 JuncĆ
tions are labeled with a J. In preheat the following
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 Relay,
which is 24 VDC return at the grey wire in J11.4.
D35 LED shows the Hot Air Enable relay is actiĆ
vated when the Fan@Speed Relay is closed at the
Inverter sending 24 VDC return in at J11.4; this sigĆ
nal 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 enĆ
abled 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/temperaĆ
ture 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 contactor 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.