4.Reinstall the burner manifold assembly on boiler.
5.Restore electrical power and gas supply to boiler.
•Put the boiler back in operation by following the lighting instructions in this manual or on the lighting and operating label on the boiler. See pages 43 - 44.
•Check for gas leaks and proper boiler and vent operation.
2.PILOT BURNER - ELECTRONIC IGNITION
To establish pilot flame without main burner operation, it will be necessary to perform the following steps:
Servicing of the pilot burner (every six months) includes keeping pilot shield (not shown) free of lint, cleaning the burner head, the primary air opening and the orifice of the pilot burner, Figure 35.
1.Open fused disconnect switch or shut off electrical power to the boiler.
2.Disconnect wire from MV wire on valve.
3.Close fused disconnect switch to restore electrical power to the boiler.
The pilot will now ignite provided the system is calling for heat.
4.Adjust pilot flame.
To adjust the pilot flame, remove the cap screw from the pilot adjusting screw (Figure 36) and turn to deliver a sufficient flame at the pilot burner to cover 3/8" to 1/2"
FIGURE 35.
Check for good terminal connection at the sensing probe at the pilot burner assembly if pilot does not light.
Check for electrical power to the valve. If electrical power and gas are present at the valve and the pilot does not operate when system calls for heat, replace valve.
5.Low gas pressure
•Adjust pilot flame by means of the pilot gas adjustment located in the gas valve.
•The pilot flame should envelop 3/8 to 1/2 inch of the tip of the thermocouple. Remove pilot adjustment cover screw, Figure 36. Turn inner adjustment screw or pilot adjusting valve clockwise to decrease, or counterclockwise to increase pilot flame. Be sure to replace cover screw on combination gas valve after adjustment to prevent possible gas leakage.
GROUND
TERMINALS (2)
GAS VALVE KNOB
PRESSURE REGULATOR
ADJUSTMENT
INLET
PILOT
OUTLET
PILOT ADJUSTMENT
GAS (UNDER CAP SCREW)
CONTROL
PILOT ADJUSTMENT | OUTLET |
| |
UNDER SCREW | PILOT SUPPLY |
FIGURE 36.
6.Clogged pilot burner orifice.
•Clean or replace orifice. A clogged orifice will restrict gas flow and result in low thermocouple output.
7.Incorrect orifice.
•Replace. The Orifice size is stamped on the wrench flats.
8.Clogged primary air opening.
•Restricted air passages will sof ten the pilot flame and result in poor thermocouple flame impingement.
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