33
Maintenance
Sequence of Operation
After preheat the control can be operated in Manual Mode
or in one of the 100 programs. Each program can have
up to 6 steps and a hold. In each step the user can pro-
gram Core Probe (Yes/No), Cook Time, Mode (Steam/
Combi/Reth/Hot A), Set Temp, Fan Speed (Gentle/Low/
High/Turbo), Fan Reverse (Manual/Auto), Fan Reverse
Time, and Vent Setting (Close/Open).
If Core Probe is “Yes”, the unit will look for the resistance
at the probe port on the front on the control. If Fan reverse
is set to Auto, the control will automatically reverse the fan
every 2 minutes while a time counting down. If it is set to
manual, the reverse time can be set. Also the Cook Time,
Cook Mode, Set Temp, Fan Speed, as well as Vent posi-
tion, can be programmed for each step. When the Vent
is opened, D24 LED lights and 24 VDC is sent by K5 on
the grey wire at J2.4; no voltage is present when the vent
is closed.
If operating in Manual Mode, you can manually modify
the Fan Speed, the Vent Position, Core or Cavity Probe,
Time and Temp, Steam on Demand (not functional in
steam mode) and the Cook Modes: Hot Air, Combi,
Steam, and Retherm.
Hot Air uses the “call for heat” sequence mentioned
above.
Combi uses the same call for heat and the Water Spritzer
is cycled at 33% for the default setting, or 20 seconds on
40 Seconds off. The cycle rate can be adjusted from 0 to
100%. When the Water Spritzer is called for, D33 is lit,
and K8 sends out 24 VDC on the Violet wire at J18.3.
Steam uses the same call for heat and the Spritzer is cy-
cled at 100%. In steam the lowest temperature setting is
85?F and the maximum temperature in the steam mode
is 225?F. Steam on demand is not available in Steam
mode because the control is cycling the Spritzer at 100%
already.
Retherm uses the Water Spritzer at a 25% duty cycle, or
15 seconds on 45 Seconds off, and the call for heat is set
at 250?F as the default temperature. The Water Spritzer
cycle rate can be adjusted from 10 to 90% and the Tem-
perature can be set to 250 - 300?F.
When the Control calls for the fan to go Forward, J2.11
will have 23 VDC return and J2.12 will have 0 VDC. That
condition will invert when the fan call is for Reverse; J2.12
will have 23 VDC return and J2.11 will have 0 VDC. The
speeds are set by J2.9 and J2.10. 0 VDC on both is Gen-
tle Speed, J2.9 with 23 VDC return and J2.10 with 0 VDC
is Low Speed, J2.9 with 0 VDC and J2.10 with 23 VDC
re- turn is High Speed, and 23 VDC return on J2.9 and
J2.10 is Turbo Speed.
The Cooling Fan is controlled by the probe located under
the Inverter heat sink; it is cycled on at 100?F. When the
Cooling Fan is called for, K4 Relay sends 24 VDC out at
J3.11 on a grey wire, and the call is indicated by LED D26.
The Cooling Fan is also activated at any time the timer is
counting down.
Cook Done is not used. Therefore no wire is located at
J2.2, where K14 sends 24 VDC when D21 is lit. However,
Cook Done is activated when the Timer goes off on the
control.
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