Groen CC20-E Operator's Manual page 41

(Revised 1/02)
7. K11, K12, R11, and R12 energized. (Air Heat)
8. K11, K12, R11, and R12 de-energized. (Air Heat)
9. Relays K11, K12, R11 and R12 energized and de-energized.
Oven Mode (Prior to Serial Number C7439MS)
Refer to the Oven mode circuit diagrams on page 3-28 and/or the schematic
diagrams on page 3-34 for the following sequence of events.
1. Mercury relay R1 and relay K6 energize. Fan motor turns on.
2. Relays K11, K12, R11, and R12 energize. Air heating elements turn on.
3. When oven temperature reaches the temperature set point, relays K11, K12,
R11, and R12 de-energize. Air heating elements turn off.
4. Relays K11, K12, R11 and R12 will cycle ON and OFF to maintain oven
temperature.
Relay Operation Summary
1. K6 and R1 energized. (Fan)
2. K11, K12, R11, and R12 energized. (Air Heat)
3. K11, K12, R11, and R12 de-energized. (Air Heat)
4. Relays K11, K12, R11 and R12 energized and de-energized.
Hold Mode (Manual) (Prior to Serial Number C7439MS)
Refer to the schematic diagrams on page 3-34 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. K15 and K13 energized. Boiler drain valve closes and boiler fill valve opens.
Boiler fill begins.
2. Relay K6 and mercury relay R1 energize. Fan motor turns on.
3. When water reaches low water probes, relays K2, K3, R2, and R3 energize.
4. When water reaches high water probe, relay K13 de-energizes and boiler fill
valve closes.
5. When boiler water reaches "ready" temperature, relays K2, K3, R2, and R3
de-energize and water heating elements turn off.
6. Relays K11, K12, R11, and R12 energize. Air heating elements turn on.
7. When oven air temperature is 10° below temperature set point, relays K12
and R12 de-energize. Relays K11 and R11 remain energized. Air heating
elements controlled by K11 and R11 operate at reduced power.
Sequence Of Events
Prior to Serial Number C7439MS
CC20-E
3-9