Groen CC20-E Operator's Manual page 178

C/2-G
Sequence Of Events
Combo Mode
1. Relays K13 and K5 energized. Boiler drain valve closes and boiler fill valve
opens.
2. Relay K6 energizes. Fan motor turns on.
3. Relay K12 energizes allowing gas valve SV2 to open. Pilot runner tube opens.
4. After 7 seconds, relay K11 energizes and air manifold gas valve SV1 opens.
Air burner turns on.
5. When water reaches the low water probe, K2 and K3 energize allowing the
boiler low fire gas valve SV3 and boiler high fire gas valve SV4 to open.
6. When water reaches the high water level probe, relay K13 de-energizes. The
boiler water fill valve closes.
7. When oven cavity temperature reaches 200°F, relays K11 and K12 de-
energize. Gas valves SV1 and SV2 de-energize.
8. When boiler water temperature probe reaches READY, relay K3 de-energizes.
Boiler high fire gas valve closes. Relay K2 remains energized. Boiler goes to
low heat.
9. Relay K12 energizes allowing gas valve SV2 to open. Pilot runner tube open.
10. After 7 seconds relay K11 energizes and air manifold gas valve SV1 opens.
Air burner turns on.
11. Relay K14 energizes. Condensate water spray valve opens.
12. When the oven reaches set point temperature, relays K11 and K12 de-
energize. Air elements turn off.
Relay Operation Summary
1. K13 and K15 energized.
2. K6 energized.
3. K12 energized.
4. K11 energized.
5. K2 and K3 energized.
6. Relay K13 energized.
7. K11 and K12 de-energized.
8. K3 de-energized and K2 remains energized.
9. K12 energizes.
10. K11 energizes.
5A-4