2
5
1)
Gas company pressure regulator or meter operating incorrectly, not allowing required gas
pressure at burner train inlet. Have gas company correct.
2)
Gas cock upstream of train inlet not fully open. Check and correct.
3)
Gas line obstructed. Check and correct.
4)
Gas train main and/or leak test cocks not fully open. Check and correct.
5)
Gas supply line between gas company regulator and burner inlet too small. Check supply
pressure at meter, determine pressure drop and increase line size as required, or raise supply
pressure to compensate for small line. Do not raise pressure so high that under static (no flow)
conditions the pressure exceeds the maximum allowable pressure to the gas train components
on the burner.
6)
Burner gas train components sized too small for supply pressure. Increase component size as
appropriate.
7)
Automatic gas valve not opening fully due to defective operation. Replace gas valve.
8)
Butterfly valve not fully opened. Readjust.
9)
Defective main gas pressure regulator. Replace
10)
Incorrect spring in main gas pressure regulator. Replace as required.
11)
Main gas pressure regulator vent line obstructed. Check and correct.
12)
Normally open vent valve (if supplied) not closing when automatic gas valves open. Check to see
if valve is fully closed when automatic valves are open. Replace vent valve, if not closing fully.
5
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5.6.1 Burner Motor runs, but Oil Flame Is Not Established
1)
Defective or incorrect size oil nozzle. Remove and clean or replace.
2)
Low oil pressure. Check with gauge for correct light-off pressure.
3)
Defective oil pump. Replace.
4)
Defective oil solenoid valve. Replace.
5)
Oil pump coupling loose or defective. Replace or tighten as required.
6)
Low oil pressure switch defective or incorrectly set. Adjust or replace switch.
7)
Ignition transformer defective. Replace.
8)
Air flow switch not making. Reset pressure or replace.
9)
Defective flame safeguard control or plug in purge timer card. Replace.
10)
Air dampers held in high fire position due to mechanical binding causing servo coupling slippage.
Determine cause and readjust dampers.
11)
Loose wire connections. Check and tighten all connections.
5.6.2 Oil Flame Ignites, but then Flame Safeguard Control Locks Out On Safety
1)
Flame scanner lens dirty. Remove and clean.
2)
Scanner sight tube blocked or dirty. Check and clean.
3)
Flame scanner defective. Replace.
4)
Defective oil nozzle causing unstable flame and scanning problems.
Clean or r
eplace oil nozzle.
5)
Fuel/air ratios incorrect, resulting in unstable or smoky flame causing scanner flame sighting
problem. Readjust ratios for clean stable flame.
6)
Defective flame safeguard amplifier or control. Replace as appropriate.
5.6.3 Oil Flame Extremely Smoky At Light Off Or In Low Fire Position
1)
Defective or incorrect size oil nozzle. Replace.
2)
Fuel/air ratio incorrect. Readjust.
3)
Atomizing air pressure too low. Close air bleed valve to increase air pressure.
5.6.4 Light Off Oil Flame Is Established and Proven, But Burner Will Not Attempt to Go To The High Fire
Position
1)
Temperature or pressure control could be defective or not set to call for high fire. Readjust or
replace control.
2)
Loose wires or incorrectly wired. Verify wiring and tighten all connections.
3)
Flame safeguard control or high fire panel switching relay (if supplied) defective. Verify and
correct as required.
4)
Defective modulating motor. Replace.
Summary of Contents for UCM-1000
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