Groen CC20-E Operator's Manual page 145

(Revised 1/02)
5. When water level reaches the low water level probe, relays K2 and K3
energize. Gas valves SV3 and SV4 open.
6. When the water temperature is approximately 150°F, relays K2 and K3
de-energize, and gas valves SV3 and SV4 close.
7. When water reaches high water level probe, relay K9 and K10 de-energize.
8. Relays K2 and K3 energize allowing gas valves SV3 and SV4 to open. Water
brought to a full boil.
9. Relays K2 and K3 de-energize. SV3 and SV4 are closed.
10. Relay K15 de-energizes allowing the drain valve to open and boiler to drain.
11. Relay K14 de-energizes and condensate spray valve closes.
12. Relay K15 energizes and drain valve closes. K13 energizes and boiler fill valve
opens. Boiler fills.
13. When water reaches low water level probe, relays K2 and K3 energize. Gas
valves SV3 and SV4 open.
14. When water reaches the high water level probe, relay K13 deenergizes and
boiler fill valve closes.
15. When water temperature is approximately 205°F, relay K14 energizes allowing
the condensate spray valve to open.
16. Relays K2 and K3 de-energize. Gas valves SV3 and SV4 close.
17. Relay K15 de-energizes. Drain valve opens.
18. Relay K14 de-energizes. Condensate spray valve closes.
Sequence Of Events
Prior to Serial Number C7243MS
CC20-G
5-7