21
11. TROUBLE SHOOTING
PROBLEM
CAUSES
SOLUTIONS
Heating inefficient during the first
combustions. Lack of draft.
Improper adjustment of the
barometric damper (opened too
wide). Chimney flue restriction
(too long. 90
o
elbows)
Adjust the damper, minimize the
chimney length and use 45
o
elbows.
Furnace heats well, warm air
plenum is very hot by there is not
much heat coming out in the
room.
Improper installation of the ducts,
little static pressure, unbalanced
system (too many warm air
outlets and not enough cold air
inlets).
Reinstall the ducts correctly.
Respect the minimum static
pressure of 0.20 in. w.c.
Furnace consumes a lot of wood.
The thermostat which controls
the damper is continuously
activated and is too close to a
source of cold. Damper not
properly adjusted. House not
insulated enough. Ash drawer is
not tightly closed. Furnace too
small for the surface to be
heated. Unbalanced ventilation
system, very little heat where the
thermostat is located.
Relocate the thermostat. Adjust
the chain that links the damper to
the servo-motor. Rebalance the
ventilation system in order to
increase the air flow in the room
where the thermostat is located.
Fan start-up is too slow.
Fan “ON” setting too high.
Return air is too cold
(temperature lower than 65
degrees). Limit control not well
located in the warm air plenum.
Lower the temperature starting
point. Usually, the limit control is
set at 150 degrees, we can under
certain conditions, reduce this
temperature. Reduce the fresh air
flow. Relocate the limit control.
A lot of creosote, moderate heat
output.
Wet wood, lack of draft.
Barometric damper not properly
adjusted. Sooted up chimney.
Use dry wood. Adjust the
barometric damper. Clean the
chimney flue and the furnace
exchangers.
Furnace heats a lot but the warm
air plenum does not get hot.
Wet wood or low grade wood.
Too much cold air return for the
hot air ducts. Unbalanced
ventilation system.
Use dry wood. Reinstall the
ventilation system correctly.
IMPORTANT NOTE
FOR, INSTALLATION OF A CENTRAL HEATING VENTILATION SYSTEM, IT IS
HIGHLY RECOMMENDED TO CONSULT A HEATING SYSTEM VENTILATION
SPECIALIST
