Groen CC20-E Operator's Manual page 37

(Revised 1/02)
4. When oven temperature reaches the temperature set point, relays K11, K12,
R11, and R12 de-energize. Air heating elements turn off.
5. Relays K11, K12, R11, and R12 will cycle ON and OFF to maintain the oven
temperature.
Relay Operation Summary
1. R1 energized. (Mercury Relay)
2. K6, K7, and K8 energized. (Fan)
3. K11, K12, R11, and R12 energized. (Air Heat)
4. K11, K12, R11, and R12 de-energized. (Air Heat)
5. K11, K12, R11, and R12 energize and de-energize.
Hold Mode (Manual) (Prior to Serial Number C7439MS)
Refer to the schematic diagrams on pages 3-32 and 3-33 for the following
sequence of events.
NOTE: Low humidity on older panels only. When "Lo" humidity is selected there
is no water in steam generator.
1. Mercury relay R1 energized.
2. Relays K15 and K13 energized. Boiler drain valve closes and boiler fill valve
opens. Boiler fill begins.
3. Relays K6, K7, and K8 energize. Fan motor turns on. Fan will cycle on and
off as required.
4. When water reaches low water probes, relays K2, K3, K4, R2, R3, and R4
energize.
5. When water reaches high water probe, rely K13 de-energizes and boiler fill
valve closes.
6. When boiler water reaches "ready" temperature, relays K2, K3, K4, R2, R3,
and R4 de-energize and water heating elements turn off.
7. K14 energizes and condensate spray valve opens.
8. Relays K11, K12, R11, and R12 energize. Air heating elements turn on.
9. When oven air temperature is 10° below temperature set point, relays K12
and R12 de-energize. Air heating elements operate at reduced power.
10. When oven temperature reaches the temperature set point, relays K11 and
R11 de-energize. Air heating elements turn off.
Sequence Of Events
Prior to Serial Number C7439MS
CC20-E
3-5