21
• Incoming natural gas pressure less
than 4” W.C, or propane less than
11” W.C.
4. Check burner flames for proper flame
pattern:
• Typical -transparent blue
• Overfired - Flames are large
• Underfired - flame are small
• Lack of combustion air - Yellow tip-
ping on flames
4- SYSTEM PIPING
• Check sytem piping for leaks, if found,
repair immediately
5- VENTING SYSTEM
• Check the gas tight seal at all vent
connection.
COMBINATION HEATER START UP
12
13
Inlet
Outlet
Gas
Control
Knob
Pilot Outlet
Honeywell VR 8304M
Honeywell S8610
Fig. 18:Intermittent pilot combination Gas Valve & Electronic Ignition Control
(See Fig. 12)