2017_E_TYPE-HL.doc Page 51 of 55 24-Oct-2017
9.3 Ignition Sequence
1. Blower on-air switch closes.
2. Pilot ignition on (spark cuts off after pilot flame proves).
3. Pilot solenoid open - pilot flame proves - runs continuously while the burner is on.
4. UV scanner proves pilot in 4 seconds. If the flame does not prove, the burner will lockout.
5. Main gas valve (slow opening) activates and allows for a full processing flame.
Note: Flameout response time is 0.8 seconds. Safety lockout requires manual reset.
The ignition sequence is depicted in Figure 9.2.
9.4 Maintenance
The burner should be visually inspected periodically as follows:
1. Check that flow of combustion air to the burner is not blocked or obstructed in any way.
2. Ensure that the blower wheel is not dirty or plugged with foreign matter (clean the wheel if
needed - a dirty wheel can reduce airflow up to 35%).
3. Check the air damper to ensure that it has not loosened.
4. Clean, inspect, and reset the spark electrode regularly. The electrode ignition end should be
ground on a 45-degree angle to a point. This ensures a direct hot spark. To adjust the spark
electrode insert it until the ground tip bottoms out, back it off 1/8 inch and snug the screw.
Note: Make sure the electrode tip is not touching the bottom and that the porcelain is
not catching on the burner cup. Do not over tighten the screw
If the electrode porcelain is cracked, replace the electrode. Cracked porcelain may cause
shorts and weak sparks.
5. Keep the burner clean and free of dirt and debris.
9.5 Adjustments
Refer to Table 9.1 for preliminary gas valve and air shutter adjustments.
9.6 Trouble Shooting
Malfunctions can usually be pinpointed visually or audibly. The following steps should be
performed if the burner does not fire.
• Clean and reset the spark electrode and clean the scanner lens.
• Reset the burner and perform the checks listed in the Table 9.2.
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