Operation
13
Oven Start-Up
INITIAL OVEN START-UP
1. Turn the manual gas valve to ON.
STEAM MODE (if applicable)
1. Turn the mode selector switch to STEAM.
2. The combustion blower turns on.
3. The green POWER Indicator lamp on the front
control panel lights.
4. The steam generator flushes and drains auto-
matically for 75 seconds if the unit has been off
for at least 5 hours.
5. The steam generator begins to fill. After two
minutes, the FILL indicator lamp on the front
control panel blinks. The convection blower
and POWER lamp turn off.
6. When the steam generator is filled to the proper
level and preheated, the convection blower, in-
terior lights and POWER indicator lamp turn on.
7. Several relay contacts change state. A click is
heard when the gas valve opens.
8. The steam generator main burner ignites.
9. Steam fills the cavity and is controlled by a
non-accessible internal thermostat.
HOT AIR MODE (if applicable)
1. Turn the mode selector switch to Hot Air.
2. The convection blower turns on.
3. Set the hot air thermostat to the desired tem-
perature.
4. The thermostat lamp lights, indicating the cav-
ity temperature is below the desired set point.
5. Two series of clicks are audible as the hot air
pilot burners and main burners ignite.
6. When the cavity temperature reaches the de-
sired set point, the temperature indicator lamp
goes off. The main burners shut off.
COMBI MODE (if applicable)
1. Turn the mode selector switch to COMBI.
2. The combustion blower turns on.
3. The green POWER indicator lamp on the front
control panel lights.
4. Set the Hot Air thermostat to the desired tem-
perature.
5. The steam generator flushes and drain auto-
matically for 75 seconds if the unit has been off
for at least 5 hours.
6. The steam generator begins to fill. After two
minutes the FILL indicator lamp on the front
control panel blinks. The convection blower
and POWER lamp do not shut down.
7. When the steam generator is filled to the prop-
er level, several relay contacts change state.
A click is heard when the gas valve opens.
8. When the steam generator comes up to a pre-
determined temperature, the hot air thermo-
stat lamp illuminates, indicating the cavity
temperature is below the desired set point.
9. Two series of clicks are audible as the hot air
pilot burners and main burners ignite.
10. When the cavity temperature reaches the de-
sired set point, the temperature indicator lamp
goes off. The main burners shut off.
11. The steam and hot air burners toggle back
and forth responding to the thermostat set
points.
Summary of Contents for COMBI COS-20G
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