312A
!CAUTION
UNIT OPERATION HAZARD
Failure to follow this caution may result in improper unit operation or failure of unit components.
Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation.
Step 1 — Introduction
GENERAL
These instructions are written as if the furnace is installed in an upflow application. An upflow furnace application is where the blower is located below the combustion and controls section of the furnace, and conditioned air is discharged upward. Since this furnace can be installed in any of the 4 positions shown in Fig. 4, you must revise your orientation to component location accordingly.
ELECTRICAL CONTROLS AND WIRING
!WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
There may be more than one electrical supply to the furnace. Check accessories and cooling unit for additional electrical supplies that must be shut off during furnace servicing.
The electrical ground and polarity for
NOTE: If the polarity is not correct, the STATUS LED on the control will flash rapidly and prevent the furnace from heating. The control system also requires an earth ground for proper operation of the control and
The
Proper instrumentation is required to service electrical controls. The control in this furnace is equipped with a Status Code LED
For an explanation of status codes, refer to service label located on blower access door or Fig. 57, and the troubleshooting guide which can be obtained from your distributor.
See Fig. 62 for a brief Troubleshooting guide.
For Controls with an Amber LED
The stored status codes will NOT be erased from the control memory, if 115- or
1.To retrieve status codes, proceed with the following: NOTE: NO thermostat signal may be present at control, and all
a.Leave
b.Remove outer access door.
c.Look into blower access door sight glass for current LED status. Removing blower access door will open blower access door switch and terminate
d.BRIEFLY remove insulated terminal wire from the draft safeguard (DSS) switch until LED goes out, then reconnect it.
NOTE: If wire to DSS is disconnected longer than 4 sec, main blower starts, and retrieval request is ignored.
2.When above items have been completed, the LED flashes status code 4 times. Record this status code for further troubleshooting. After the LED flashes status code four times, BRIEFLY remove wire again from DSS switch until LED goes out, then reconnect it to retrieve previous status code (if available). Repeat as needed for more previous status codes or until Code 11 appears.
Step 2 — Care and Maintenance
!WARNING
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal injury, death and/or property damage.
Never store anything on, near, or in contact with the furnace, such as:
1.Spray or aerosol cans, rags, brooms, dust mops, vacuum cleaners, or other cleaning tools.
2.Soap powders, bleaches, waxes or other cleaning compounds, plastic or plastic containers, gasoline, kerosene, cigarette lighter fluid, dry cleaning fluids, or other volatile fluids.
3.Paint thinners and other painting compounds, paper bags, or other paper products. Explosure to these materials could lead to corrosion of the heat exchanger.
For continuing high performance and to minimize possible furnace failure, periodic maintenance must be performed on this furnace. Consult your local dealer about proper frequency of maintenance and the availability of a maintenance contract.
!WARNING
ELECTRICAL SHOCK AND FIRE HAZARD
Failure to follow this warning could result in personal injury, death or property damage.
Turn off the gas and electrical supplies to the unit before performing any maintenance or service. Follow the operating instructions on the label attached to the furnace.
!WARNING
CARBON MONOXIDE POISONING AND FIRE HAZARD
Failure to follow this warning could result in personal injury, death, and/or property damage.
Never operate unit without a filter or with filter access door removed.
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