Sequence Of Operation; Lower Oven; Bake Cycle - Bake Preheat And Bake Mode - Thermador SMW272 B Service Manual

Lower Oven Section

SEQUENCE OF OPERATION

Bake Cycle — Bake Preheat & Bake Mode
Press the BAKE keypad and select an oven temperature and the following events will occur on the relay
board:
• Line Relay K8 closes.
• Cooling Fan Relay K6 closes and turns the Cooling Fan on.
• 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 K8 (already activated).
• The L1 Relay connects L1 line voltage to the Bake and Broil Elements.
• Bake Relay K1 and Broil Relay K2 alternately open and close, and connect the L2 (120-volt) line
to the Bake and Broil elements. NOTE: 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
N.O.
Relay
Cooling
Fan

Lower Oven

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 75
SMW Oven Service Manual
K2
N.O. N.O.
Broil
Relay
Bake
Broil
51 Seconds
8 Seconds
11 Amps
15 Amps