42
PROBLEM CAUSE REMEDY
Poor Combustion 1. Refractories Check refractories to see if they are plugged with soot or broken in
pieces. Clean or replace as necessary.
2. S.S. Ring Check to be sure ring is present and fits tight against the furnace wall.
3. Primary Air Adjustment Check air adjustment. Air/fuel mixture may be off. Open primary air so
fire is to outside wall of furnace.
4. Secondary Air Adjustment Check main air adjustment to see if it is loosened up. Adjust as
necessary and tighten plate in position.
Check CO
2
and O
2
levels.
5. Draft Check draft with a gauge. Draft should be a -.02 " to -.04" W.C. with
burner off or -.04" to -.06" when operating. May need to install a
barometric damper.
6. Dirty Flue Check flue for carbon buildup or blockage. Clean flue passages with brush.
7. Negative Room Pressure Make sure no exhaust fans are running in the boiler room.
Burner back fires 1. Refractories Check refractories to see if they are plugged with soot or broken in
pieces. Replace as necessary.
2. Ignition Electrodes Check electrodes for carbon buildup and clean if
necessary. Check for proper adjustment Readjust if
necessary. Check for cracks in porcelain; if found replace.
3. Draft Check draft with a gauge. Draft should be a -.02 " to -.04"
W.C. with burner off or -.04" to -.06" when operating. May
need to install a barometric damper.
4. Negative Room Pressure Make sure no exhaust fans are running in the boiler room.
Boiler will not 1. Gas Supply Check gas pressure coming into gas train. If low, contact gas company.
maintain pressure Check coil in gas valve with AMP meter. Replace if bad.
Check gas regulator setting and readjust as necessary.
2. Dirty Flue Check flue for carbon buildup or blockage. Clean flue passages with brush.
3. Pressuretrol Disconnect all power to the controller. Disconnect the wires from the
controller. Put an OHM meter between the switch terminals. Lower the
set point of the controller. Switch should make. Raise the set point and
recheck with OHM meter. Switch should break. If the controller
operates improperly, replace it.
4. Scale Built up in boiler Refer to Section 2 “Pressure Vessel Cleaning”.
5. Refractories Check refractories to see if they are cracked or broken in pieces.
Replace as necessary.
6. Steam traps blowing through Check traps to see if they are clean or replace as necessary.
7. Boiler size. Boiler may be undersized.
Boiler is Surging 1. Steam traps blowing through Check traps to see if they are clean or replace as necessary.
2. High organic in boiler Drain and clean boiler with washing soda per instruction manual.
(i.e. Perc or oil)
3. High boiler TDS Drain boiler and flush system. Refill and increase blow-down
rate/frequency.
4. Too much water akalinity Have water tested by water treatment company, lower boiler alkalinity
(high PH) to recommended level.
5. High sudden steam load Check total equipment horsepower required against horsepower of
boiler being used. Decrease amount of equipment being used at one
time, or reduce the steam flow by partially closing the steam stop valve.
6. High level of water Consult water treatment expert and adjust levels to boiler
treatment chemicals recommended levels.
Boiler Rumbles and 1. Draft problem Check draft with a gauge. Draft should be a -.02” to -.04” W.C. with
Pulsates burner off or -.04” to -.06” when operating. May need to install a
barometric damper.
Boiler pushing water 1. Steam Traps Check traps. Clean or replace as necessary.
with the steam
(carryover) 2. High boiler TDS Drain boiler and flush system. Refill and increase blow-down
rate/frequency.
3. High level of water Consult water treatment expert and adjust to boiler recommended levels.
treatment chemicals
VMP IOM
Maintenance
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