Groen CC20-E Operator's Manual page 142

CC20-G
Sequence Of Events
Prior to Serial Number C7243MS
Operating Conditions
• Pilot burner flame established.
• Oven cavity below 200°F.
• Oven door closed.
• No service codes displayed in the time display window. Press COMBO key and
ON simultaneously.
• There are no apparent oven operating problems.
Steam Mode (Prior to Serial Number C7243MS)
Refer to the Steam mode circuit diagram on page 5-16 and/or the schematic
diagram on page 5-19 for the following sequence of events.
1. Relays K15 and K13 energized. Boiler drain valve closes and boiler fill valves
open. Boiler fill begins. Note: A flush may precede this operation (i.e. drain
open fill valve open).
2. Relay K6 energized. Fan motor turns on.
3. Relay K12 energizes and gas valve SV2 opens.
4. Approximately 3 seconds after SV2 opens, relay K11 energizes and oven
manifold valve SV1 opens.
5. When water reaches the low level probe, K2 energizes allowing low boiler
valve SV3 to open, and K3 energizes to allow high boiler valve SV4 to open.
6. When water reaches high water probe, relay K9 and K10 de-energizes. The
boiler fill valve closes.
7. When oven cavity temperature reaches approximately 200°F, relays K11 and
K12 de-energize. Oven manifold valve SV1 and gas valve SV2 deenergize.
8. When boiler water temperature reaches "ready" temperature, relay K3 de-
energizes causing high boiler valve SV4 to close.
9. Relay K14 energizes and the condensate spray valve opens.
Relay Operation Summary
1. K15 and K13 energized. (Drain and Fill)
2. K6 energized. (Fan)
3. K12 energized. (Low Air)
4. K11 energized. (High Air)
5. K2 and K3 energized. (Low and High Boiler)
6. K13 de-energized. (Fill)
5-4
(Revised 1/02)