507335-02
Page 29 of 39
Issue 2001
Allowable Heating Speeds
Model
Speed Adjust
Setting "D"
Setting "C"
Setting "B"
Setting "A"
80G2UH070AV12
+10%
Allowed
Allowed
Allowed
Not Allowed
Norm
Allowed
Allowed
Factory Setting
Allowed
-10%
Allowed
Allowed
Allowed
Allowed
80G2UH090BV16
+10%
Allowed
Allowed
Allowed
Not Allowed
Norm
Allowed
Allowed
Factory Setting
Not Allowed
-10%
Allowed
Allowed
Allowed
Allowed
80G2UH110CV20
+10%
Allowed
Allowed
Allowed
Not Allowed
Norm
Allowed
Allowed
Factory Setting
Allowed
-10%
Allowed
Allowed
Allowed
Allowed
Table 11.
Allowable Circulation Speeds
Model
38% of Second Stage Cooling
All Models
Factory Setting
Table 12.
Start-Up
For Your Safety, Read Before Operating
Do not use this furnace if any part has been under
water. Immediately call a licensed professional service
technician (or equivalent) to inspect the furnace and
to replace any part of the control system and any gas
control which has been under water.
WARNING
If overheating occurs or if gas supply fails to shut off,
shut off the manual gas valve to the appliance before
shutting off electrical supply.
WARNING
Before attempting to perform any service or
maintenance, turn the electrical power to unit OFF at
disconnect switch.
CAUTION
During blower operation, the ECM motor emits
energy that may interfere with pacemaker operation.
Interference is reduced by both the sheet metal cabinet
and distance.
WARNING
BEFORE LIGHTING
smell all around the appliance area
for gas. Be sure to smell next to the floor because some
gas is heavier than air and will settle on the floor.
The gas valve on this unit is equipped with a gas control
switch. Use only your hand to move the switch. Never use
tools. If the switch will not turn or if the control switch will
not move by hand, do not try to repair it.
Placing the Furnace into Operation
These units are equipped with an automatic ignition
system. Do not attempt to manually light burners on these
furnaces. Each time the thermostat calls for heat, the
burners will automatically light. The ignitor does not get hot
when there is no call for heat on units with an automatic
ignition system.
If you do not follow these instructions exactly, a fire
or explosion may result causing property damage,
personal injury, or loss of life.
WARNING