Groen CC20-E Operator's Manual page 48

CC20-E
Sequence Of Events
After Serial Number C7439MS
19. Relay K14 energizes and condensate spray valve opens.
20. Relays K2, K3, K4, R2, R3, and R4 de-energize and water heating elements
turn off.
21. Relay K15 de-energizes. Drain valve opens and boiler drains.
22. Relay K14 de-energizes and condensate spray valve closes.
480V Unit
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 page 3-25 and/or the schematic
diagrams on page 3-34 for the following sequence of events.
1. Relays K15 and K13 energize. Boiler drain valve closes and boiler fill valve
opens. Boiler fill begins.
2. Relay K6 and mercury relay R1 energize. Fan motor turns on.
3. When water reaches low water probes, relays K2, K3, R2, and R3 energize.
4. When water reaches high water probe, relay K13 de-energizes and boiler fill
valve closes.
5. When boiler water reaches "ready" temperature, relays K3 and R3 de-
energize. Relays K2 and R2 remain energized. Water heating elements go to
low fire.
Relay Operation Summary
1. K15 and K13 energized. (Drain and Fill)
2. K6 and R1 energized. (Fan)
3. K2, K3, R2, and R3 energized. (Water Heat)
4. K13 de-energized. (Fill)
5. K3 and R3 de-energized. K2 and R2 remain energized. (Water Heat)
3-16
(Revised 1/02)