Self-Clean Cycle - Preheat Below 840 - Thermador SMW 272 B Service Manual

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Lower O ven Section
Self-Clean Cycle — Preheat Below 840
Press the SELF-CLEAN keypad and select a self-clean time period and the following events will occur on
the relay board:
K8
• Line Relay
• Cooling Fan Relay
• Cooling Fan air flow closes the Air Switch and activates the Stalled Fan Relay.
• The Stalled Fan Relay contacts close and supply L1 to one side of Relay
L1
• The Relay connects L1 line voltage to the Broil Element.
K2
• Broil Relay
Element is on for 60-seconds, and draws 15-amperes during each 1-minute cycle. It is also on
continuously for the first 55-minutes of the Self-Clean cycle, or unil the oven reaches 850˚F.
L1
L2
K6
Cooling Fan
N.O.
Relay
Cooling
Fan
closes.
K6
closes and turns the Cooling Fan on.
closes and connects the L2 (120-volt) line to the Broil element. N O TE: The Broil
Air
N.O.
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 80
SMW O ven Service Manual
˚
K8 (already activated)
K2
N.O. N.O.
Broil
Relay
Broil
Bake
60 Seconds
15 Amps
.