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146
147
149
Figure 3.11
Proof of Closure Switch Location
Figure 3.12
Air/Fuel Valve Open and Engaging the Air/Fuel
Valve Open Microswitch
7. At the end of the purge cycle the combustion
safeguard initiates a 10 second trial for
ignition and the following simultaneously
occurs:
The LCD displays the message IGNITION
TRIAL.
The ignition transformer energizes.
The air/fuel valve rotates to its low fire
position. This engages the air-fuel valve
closed switch, energizing the safety shut-off
valve, (see Fig. 3.14).
CONTROL PANEL OPERATING PROCEDURES
FROM
CONNECTOR
9A
148
PROOF OF
CLOSURE
SWITCH
SAFETY
SHUT-OFF
VALVE
Figure 3.13
Blower Proof Switch Location
8. Once the combustion safeguard detects
flame, its flame LED lights. Power is
removed from the ignition transformer and
the MAIN LED lights of the combustion
safeguard.
At this point, the annunciator will display FLAME
PROVEN. The unit, provided it is in the
automatic mode, is released to modulate and
will be controlled by the temperature control
system.
Figure 3.14
Air/Fuel Valve in Ignition Position, Engaging the
Ignition Microswitch
16
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