Groen CC20-E Operator's Manual page 148

CC20-G
Sequence Of Events
After Serial Number GC7243MS
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)
7. K11 and K12 de-energized. (High and Low Air)
8. K3 de-energized. K2 remains energized. (High and Low Boiler)
9. K12 energized.
10. K11 energized.
11. K11 and K12 cycle on and off.
12. K14 energized. (Condensate Spray)
Oven Mode (After Serial Number GC7243MS)
Refer to the Oven mode circuit diagram on page 5-18 and/or the schematic
diagram on page 5-19 for the following sequence of events.
1. Relay K15 and K13 energized. Boiler drain valve closes and boiler fill valve
opens. Boiler fill begins.
2. Relay K6 energized. Fan motor turns on.
3. Relay K12 energized allowing gas valve S2 to open.
4. After 7 seconds SV2 opens, relay K11 energizes allowing gas valve SV1 to
open. Air burners turn on.
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 K13 de-energizes. The boiler fill
valve closes.
7. When the boiler water temperature reaches 150°F, relay K3 de-energizes and
SV4 high boiler valve closes.
8. Relay K2 remains energized until the boiler water temperature reaches
approximately 160°F.
9. Relay K2 de-energizes. Relay K2 will cycle ON and OFF to maintain 160°
water temperature.
10. When oven temperature reaches the temperature set point, relays K11,
and K12 de-energize causing gas valves SV1 and SV2 to close. Air burners
turn off. Relays K11 and K12 will cycle on and off to maintain the cavity set
point temperature.
5-10
(Revised 1/02)