Self-Clean Cycle - Thermador SMW272 B Service Manual

Lower Oven Section
NOTE: The Self-Clean cycle is a continuation of the Self-Clean Preheat cycle.
Press the SELF-CLEAN keypad and the following events will occur on the relay board:
• The L1 Relay connects L1 line voltage to the Bake and Broil Elements.
• Bake Relay K1 and Broil Relay K2 close and connect the L2 (120-volt) line to the Bake and Broil
elements. NOTE: The Broil Element is on for 44-seconds, and draws 15-amperes during each 1-
minute cycle. The Bake Element is on for 15-seconds, and draws 11-amperes during each 1-minute
cycle.
• After Self-Clean Preheat, Relay K2 cycles off, via the thermostat. When the thermostat cycles back
on, (to maintain the 850˚F self-clean temperature), Relays K1 and K2 are alternately used to maintain
the self-clean temperature until its time has expired, at which point, the oven turns off.
L1
L2
K6
Cooling Fan
N.O.
Relay
Cooling
Fan

Self-Clean Cycle

Air
Switch
Stalled Fan
Relay Contacts
Stalled
Fan Relay
High-Temp
Cutout
K1
Bake
Relay
N.O.
K8
N.O.
L1 Relay
N.C.
N.O. = Normally Open Contacts
N.C. = Normally Closed Contacts
= Neutral Return
Page 81
SMW Oven Service Manual
K2
N.O. N.O.
Broil
Relay
Broil
Bake
15 Seconds 44 Seconds
11 Amps 15 Amps