Groen CC20-E Operator's Manual page 49

(Revised 1/02)
Combo Mode (After Serial Number C7439MS)
Refer to the Combo mode circuit diagrams on pages 3-28 and/or the schematic
diagrams on pages 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.
6. Relay K14 energized. Condensate spray valve opens.
7. Relays K11, K12, R11, and R12 energize. Air heating elements turn on.
8. When oven temperature is 5° below temperature set point, relay K12 and
R12 de-energize. K11 and R11 remain energized and air heating elements
operate at reduced power.
9. When oven temperature reaches the temperature set point, relays K11 and
R11 de-energize. Air heating elements turn off.
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 energized. (Low Water Heat)
6. K14 energized. (Condensate Spray)
7. K11, K12, R11, and R12 energized. (Air Heat)
8. K12 and R12 de-energized. K11 and R11 remain energized. (Air Heat)
9. Relays K11 and R11 de-energized.
Sequence Of Events
After Serial Number C7439MS
CC20-E
3-17