Sequence Of O Peration; Lower O Ven; Bake Cycle - Bake Preheat And Bake Mode - Thermador SMW 272 B Service Manual

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Lower O ven Section
Press the BAKE keypad and select an oven temperature and the following events will occur on the relay
board:
• 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 Bake and Broil Elements.
• Bake Relay
to the Bake and Broil elements. N O TE: The Bake Element is on for 51-seconds, and draws 11-
amperes during each 1-minute cycle. The Broil Element is on for 8-seconds and draws 15-amperes
during each 1-minute cycle.
L1
L2
K6
Cooling Fan
Relay
Cooling
Fan
SEQUEN CE OF OPERATION
Bake Cycle — Bake Preheat & Bake Mode
K8
closes.
K6
closes and turns the Cooling Fan on.
K1 K2
and Broil Relay
Air
N.O. N.O.
Switch
Relay Contacts
Stalled
Fan Relay
Lower Oven
alternately open and close, and connect the L2 (120-volt) line
High-Temp
Cutout
Stalled Fan
N.O.
K8
N.O.
L1 Relay
N.C.
N.O. = Normally Open Contacts
N.C. = Normally Closed Contacts
Page 75
SMW O ven Service Manual
K8 (already activated).
K2
K1
N.O.
Broil
Bake
Relay
Relay
Bake
51 Seconds
11 Amps
= Neutral Return
N.O.
Broil
8 Seconds
15 Amps