Maintenance
DUCT WORK AND BLOWER SPEED ADJUSTMENT
Supply and return duct system should be sized properly for efficient operation. Normal air temperature rise through the furnace should be adjusted to approximately
A high temperature rise will result in excessive fuel usage. This is due to the high stack temperature that always accompanies a high air temperature rise. It can also cause premature heat exchanger failure.
To perform temperature rise check, start furnace and let it run a minimum of 10 minutes. (Be sure all duct work is complete and furnace is in its normal operating condition). Place #1 thermometer in the return duct near the furnace. Place #2 thermometer in the supply duct near the furnace, but not in the plenum. After 10 minutes or more operation, take thermometer readings. Supply air temperature should be no more than
Air temperature rise can be lowered by:
1.Increasing blower speed.
2.Additional supply or return outlets.
3.Lowering firing rate.
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