Groen CC20-E Operator's Manual page 149

(Revised 1/02)
Relay Operation Summary
1. K15 and K13 energized.
2. K6 energized. (Fan)
3. K12 energized. (Low Air)
4. K11 energized. (High Air)
5. K2 and K3 energized.
6. K13 de-energized.
7. K3 de-energized.
8. K2 de-energized.
9. K2 de-energized. Will cycle.
10. K11 and K12 de-energized. Will cycle.
Cleaning Cycle (After Serial Number GC7243MS)
Refer to the schematic diagram on page 5-19 for the following sequence of
events.
1. CL:50 is displayed in the time display window.
2. Relay K15 de-energized. Drain valve remains open for 1-1/2 minutes.
3. Relay K15 energized. Drain valve closes and boiler fills.
4. Relays K9 and K10 alternate for initial fill.
5. Relay K6 energized. Fan motor turns on.
6. When water level reaches the low water level probe, relays K2 and K3
energize. Gas valves SV3 and SV4 open.
7. When the water temperature is approximately 150°F, relays K2 and K3 de-
energize, and gas valves SV3 and SV4 close.
8. When water reaches high water level probe, relays K9 and K10 are de-
energized.
9. Relays K2 and K3 energize allowing gas valves SV3 and SV4 to open.
10. Relay K14 energized. Condensate spray on.
11. Relays K2 and K3 de-energize. SV3 and SV4 close.
12. Relay K15 de-energizes allowing the drain valve to open and boiler to drain.
13. Relay K14 de-energizes and condensate spray valve closes.
Sequence Of Events
After Serial Number GC7243MS
CC20-G
5-11