3-12
(Revised 1/02)
CC20-E
Sequence of Events
After Serial Number C7439MS
2
08V and 240V Units
Operating Conditions
• Oven cavity below 200°F.
• Oven door closed.
• No service codes displayed in the time display window.
• There are no apparent oven operating problems.
Steam Mode (After Serial Number C7439MS)
Refer to the Steam mode circuit diagrams on pages 3-23 and 3-24, and/or the
schematic diagrams on pages 3-32 and 3-33 for the following sequence of
events.
1. Mercury relay R1 energized.
2. Relays K15 and K13 energize. Boiler drain valve closes and boiler fill valve
opens. Boiler fill begins.
3. Relays K6, K7 and K8 energize. Fan motor turns on.
4. When water reaches low water probes, relays K2, K3, K4, R2, R3, and R4
energize.
5. When water reaches high water probe, relay K13 de-energizes and boiler fill
valve closes.
6. When boiler water reaches “ready” temperature, relays K3, K4, R3, and R4
de-energize. K2, K5, and R2 energize, and water heating elements go to low
fire.
Relay Operation Summary
1. R1 energized. (Mercury Relay)
2. K15 and K13 energized. (Drain and Fill)
3.
K6, K7 and K8 energized. (Fan)
4. K2 through K4, and R2 through R4 energized. (Water Heat)
5. K13 de-energized. (Fill)
6. K3 and K4, and R3 and R4 de-energized. K2, K5 and R2 energized. (Water
Heat)
Combo Mode (After Serial Number C7439MS)
Refer to the Combo mode circuit diagrams on pages 3-26 and 3-27, and/or the
schematic diagrams on pages 3-32 and 3-33 for the following sequence of
events.
1. Mercury relay R1 energized.
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