Weil-McLain SERIES 7 PFG Control Supplement page 15

PFG S 7 G -
erieS aS Fired
TO CHECK IGNITION SYSTEM GROUNDING FOR TABLE III, PAGE 14.
Pilot assembly and ignition control must share common ground with main burner.
Nuisance shutdowns are often caused by poor or erratic ground.
• Check for good metal-to-metal contact between pilot burner bracket
• Check ground lead from GND (BURNER) terminal on ignition control to ignition
Connect securely to Terminals PV
and MV/PV on ignition control.
Open manual hand valve.
Make sure gas cock is in "ON" position and pilot line is
not kinked or obstructed. Check for clean pilot orifice.
If OK, replace gas valve.
Part Number 550-110-643/0605
W B – U
ater oiler niverSal
and main burner, and between main burner and burner rest.
control mounting screw, and from "C" on transformer to transformer case ground.
Make sure connections are clean and tight. If wire is damaged or deteriorated,
replace with No. 18 ga. moisture-resistant, thermosplastic insulated wire with
105°C minimum rating.
TABLE IV: Spark is Present, Pilot Will Not Light
With or Without Vent Damper
Are pilot valve connections CORRECT and securely fastened?
Is manual hand valve open?
No Yes
Contact gas supplier to
correct gas pressure.
Replace pilot assembly.
C S
ontrol yStemS
No
Is inlet gas pressure at least 5.0"W.C. and not over 14.0"W.C.?
No
Is gas present at pilot burner assembly? CAUTION -
Remove MV wire from ignition control, use a match
taped to a long screwdriver or pilot lighter rod and
manually light pilot.
No
Is spark gap 0.125" and located in pilot gas stream?
No
Block any draft around boiler. Check for clean pilot orifice.
Yes
Yes
Yes
Yes
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