2 − Check for the correct voltage at the furnace (furnace operating).
3 − Check amp-draw on the blower motor.
Motor Nameplate__________Actual__________
NOTE − Do not secure the electrical conduit directly to the air ducts or structure.
Blower Speeds
NOTE − CFM readings are taken external to unit with a dry evaporator coil and without accessories.
1 − Turn off electrical power to furnace.
2 − Remove blower access panel.
3 − Disconnect existing speed tap at control board speed terminal.
NOTE − Termination of any unused motor leads must be insulated.
4 − Refer to blower speed selection chart on unit wiring dia- gram for desired heating or cooling speed. See blower performance data beginning on Page 48.
5 − Connect selected speed tap at control board speed terminal.
6 − Resecure blower access panel.
7 − Turn on electrical power to furnace. Electronic Ignition
The integrated control has an added feature of an internal Watchguard control. The feature serves as an automatic re- set device for ignition control lockout caused by ignition fail- ure. This type of lockout is usually due to low gas line pres-
sure. After one hour of continuous thermostat demand for heat, the Watchguard will break and remake thermostat de- mand to the furnace and automatically reset the control to begin the ignition sequence.
Exhaust and Air Intake Pipe
1 − Check exhaust and air intake connections for tightness and to make sure there is no blockage.
2 − Are pressure switches closed? Obstructed exhaust pipe will cause unit to shut off at pressure switches. Check termination for blockages.
3 − Reset manual flame rollout switches on burner box cover.
Failure To Operate
If the unit fails to operate, check the following:
1 − Is the thermostat calling for heat?
2 − Are access panels securely in place?
3 − Is the main disconnect switch closed?
4 − Is there a blown fuse?
5 − Is the filter dirty or plugged? Dirty or plugged filters will cause the limit control to shut the unit off.
6 − Is gas turned on at the meter?
7 − Is the manual main
8 − Is the internal manual
9 − Is the unit ignition system in lock out? If the unit locks out again, inspect the unit for blockages.
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