21
OPERATION OF BURNER (ELECTRONIC PILOT)
(P265-EP, P265F-EP, P250AF-EP)
Starting the Burner:
1. Depress the gas valve control knob on the combination gas valve and turn to “OFF” (See Figure 14).
2. Set room thermostat above room temperature and let burner run five minutes to purge the appliance.
3. Set thermostat below room temperature.
4. Turn gas valve control to “ON”.
5. Set room thermostat higher than room temperature so that the burner will start.
To put burner out of operation
1. Depress the gas valve control knob on the combination gas valve and turn to “OFF”.
2. Turn off electrical supply.
FIRST STAGE – TRIAL FOR PILOT IGNITION
On every call for heat (system start), the ignition control performs a 30 second pre-purge. Upon completion of the pre-purge, the
ignition control opens the pilot gas valve operator in the gas control. This allows gas to flow to the pilot burner. Simultaneously, the
electronic spark generator in the S8600 produces a 15,000 volt spark pulse output. This voltage produces a spark at the pilot burner
igniter-sensor rod, igniting the gas flowing around the electrode. If the pilot flame is not detected during the trial for pilot ignition, the
ignition control will go into a “lock-out” condition. If this occurs, proceed to the section titled SAFETY LOCK-OUT TIME.
SECOND STAGE – MAIN BURNER OPERATION
When the pilot flame is established the ignition control’s flame sensing circuit detects the flame current and shuts the spark generator
off. At the same time the main gas valve operator is opened in the gas control, allowing gas flow to the main burner. The pi lot flame
ignites the main burner conventionally.
SAFETY LOCK-OUT TIME
The trial for ignition timer circuit starts timing the moment the trial for pilot ignition starts. If the designated trial fo r ignition time expires
prior to the detection of a pilot flame, the ignition control will go into a “lock-out” condition. Before another attempt to start the burner
can be made, the ignition control must be reset. Reset by adjusting the thermostat or controller below room temperature, or t o its “OFF”
position. An alternate method is to shut the system power “OFF”. Wait at least one (1) minute and then turn the system “ON”.
If normal ignition does not occur, use Section V: Servicing and Troubleshooting to determine the problem.
To Next Page
Loading...
Need help?
General
