
7.4.3 Burner System Checkout
Once the furnace starts operating, make the following checks and adjustments:
If you are unable to obtain the proper adjustments, do not run the furnace. If you
cannot resolve the issue, call EnergyLogic Technical Services for assistance.
Blower Operation:
Within the first two or three minutes after the furnace starts, make sure
that the blower turns on and directs warm air into the room. If not, this may indicate a problem
with the Fan & Limit Control or the fan wiring. Shut down the furnace and diagnose the issue,
or call EnergyLogic Technical Service for assistance.
Exhaust System:
Check that the flue exhaust is flowing properly, and there are no exhaust
leaks inside the building. Check the outside flue pipe to ensure that no black smoke is present.
If smoke is present and the draft below is correct (see adjustment procedure below), call
EnergyLogic Technical Service for assistance.
Draft Adjustment:
After operating the furnace for about 15 minutes, verify the draft gauge is
reading 0.05 inches of water column, WC (refer to figure).
•
If the draft gauge reading is less than 0.05 inches of WC: Loosen the adjustment weight
on the barometric damper door, then slide it to the right or closer to the damper door
pivot axis, and retighten it.
•
If the draft gauge reading is more than 0.05 in. WC: Slide the weight to the left or away
from the damper door pivot axis, and retighten it.
•
Verify that the reading remains at 0.05 inches of WC with exhaust fans and vented
appliances on in your building and all doors and windows closed.
A
negative pressure inside the building may impede intake of combustion air to the
burner, which may result in a hazard from smoke inhalation and/or fire. Use of exhaust
fans in your shop without adequate make-up air may create a negative pressure. There
are other possible causes as well. Corrective measures must be taken if the correct
draft setting cannot be achieved.
If you are unable to adjust the damper door to obtain 0.05 inches WC, there is
not enough draft for proper exhaust. Do not run the furnace under this condition. If you cannot
resolve the issue, call EnergyLogic Technical Services for assistance.
Note: The draft gauge should read 0.0 inches of WC when the draft gauge probe is removed
from the stack (If not, make sure the gauge is level, and readjust the zero knob). If the furnace
Draft reading and adjustment
0.05 Inches WC
Damper Door
Knob / Weight
Draft Gauge
39
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