Thermo-Dynamics Boiler S85 - Trouble: Burner Fires, but then Loses Flame; Trouble: Insufficient Domestic Hot Water

A-3
TROUBLE: BURNER FIRES, BUT THEN LOSES FLAME
SOURCE PROCEDURE CAUSES REMEDY
Poor Fire Inspect flame for stability. Unbalanced fire. Replace nozzle with specified
nozzle.
Excessive draft. Reduce draft setting.
Insufficient draft. Increase draft.
Too little combustion air. Increase combustion air.
Oil Supply If burner loses flame prior to Air leak in fuel system. Repair leak - use only flare
the primary control locking fittings.
out, fault is in fuel system. Water in oil tank. Strip tank of water exceeding
2” in depth.
Fuel supply valve closed. Open valve.
Restriction in oil line. Clear oil line restriction.
Plugged fuel filter. Replace filter cartridge.
Plugged pump strainer. Clean strainer.
Cold oil. Use #1 heating oil.
Combustion Reduce combustion air supply. Too much combustion air. Close air band and air to
Air raise CO
2
.
Pump Install pressure gauge in gauge Pump discharge pressure Set pressure at 140 psi.
port of fuel pump. Pressure incorrectly set.
should be 140 psi. Coupling worn or broken. Replace coupling.
Pump worn - low pressure Replace pump.
motor overloads.
Excessive Take a draft reading. Draft Incorrect draft setting. Reduce draft setting. Install
Draft should be -.05”-.06” W.C. in second draft regulator if
stack. necessary.
Poor Flue Insert C0
2
probe into heat Leak in flue system. Sample C0
2
in heat exchanger.
Gas Sample exchanger tube. If reading is
greater by 1/2% or more, sample Seal flue system leak.
was being diluted near flue box.
Testing Using a chemical absorption Weak fluid. Replace fluid in testing
Method type device, let instrument set device.
after a test before venting. If
CO2 reading increases 1/2%
fluid is weak.
Nozzle Inspect nozzle for plugged Plugged orifice or distributor. Replace nozzle with specified
orifice and distributor slots. Plugged nozzle strainer. nozzle.
Poor spray pattern.
TROUBLE: INSUFFICIENT DOMESTIC HOT WATER
SOURCE PROCEDURE CAUSES REMEDY
Tankless Coil Analyze capacity vs. usage. Insufficient coil capacity. Install larger coil.
Operating Check operating control Setting too low. Set operating control to 180˚ F.
Control setting.
Heat Inspect coils for fouled surfaces Flow restriction. Remove restriction.
Exchanger and/or flow restrictions. Fouled surfaces on heat Clean heat exchanger surfaces.
exchanger.