Convection Roast Cycle - Thermador SMW 272 B Service Manual

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Lower O ven Section
N O TE: The Convection Roast cycle is a continuation of the Convection Roast Preheat cycle.
Press the CO N VECTIO N RO AST keypad and the following events will occur on the relay board:
L1
• The
• Bake Relay
line to the Bake and Convection elements. N O TE: The Convection Element is on for 29-seconds,
and draws 11-amperes during each 1-minute cycle. The Bake Element is on for 30-seconds, and
draws 11-amperes during each 1-minute cycle.
• Convection Motor Relay
• After the Convection Roast Preheat temperature has been reached, Relays K2 and K3 cycle off
(open). W hen the thermostat cycles back on, the circuit switches from Relays K2 and K3, to Relays
K1 and K3, for the rest of the selected temperature and cooking time. Relays K1 and K3 will cycle
on and off to maintain the selected temperature.
L1
L2
K6
Cooling Fan
N.O.
Relay
Cooling
Fan

Convection Roast Cycle

Relay connects L1 line voltage to the Convection and Bake Elements.
K1
and Convection Relay
K4
closes and activates the Convection Motor.
Air
N.O.
Switch
Stalled Fan
Relay Contacts
Stalled
N.O.
Fan Relay
N.C.
K3
alternately open and close and connect the L2 (120-volt)
High-Temp
Cutout
K1
Bake
N.O.
Relay
N.O.
Bake
30 Seconds
11 Amps
K8
L1 Relay
N.O. = Normally Open Contacts
N.C. = Normally Closed Contacts
= Neutral Return
Page 79
SMW O ven Service Manual
K2 K3
N.O. N.O.
Broil Conv.
Relay Relay
Conv.
Broil
29 Seconds
11 Amps
K4
Conv.
N.O.
Motor
Relay
Conv.
Motor