Groen CC20-E Operator's Manual page 40

CC20-E
Sequence Of Events
Prior to Serial Number C7439MS
5. When boiler water reaches "ready" temperature, relays K3 and R3 de-
energize. Relays K2 and R2 energize. 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 energized. (Water Heat)
Combo Mode (Prior to 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 reaches the temperature set point, relays
K11, K12, R11, and R12 de-energize. Air heating elements turn off.
9. Relays K11, K12, R11 and R12 will cycle ON and OFF to maintain oven
temperature.
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)
3-8
(Revised 1/02)