User Guide

ICM281
Fixed Speed Furnace Control Replacement Module
Replaces: Carrier CESO110057-00, CESO110057-01, CESO110057-02
Safety Considerations
Only trained personnel should install or service heating
equipment. When working with heating equipment,
be sure to read and understand all precautions in the
documentation, on labels, and on tags that accompany the
equipment. Failure to follow all safety guidelines may result
in damage to equipment, severe personal injury or death.
Introduction
The ICM281 fixed speed furnace control replaces the
following Carrier/BDP modules: CESO110057, CESO110057-1,
CESO110057-2, CESO110048, CESO110020, and HH84AA016
The ICM281 has incorporated LED diagnostics to assist in
troubleshooting.
It is recommended that a sight glass (not included) be
installed in a convenient location on the furnace to take
advantage of this feature. If a sight glass is not installed, the
self-test feature of the board can still be used for routine
troubleshooting. A fault code label is included in this package
and must be installed on the furnace.
Electrostatic Discharge (ESD) Precautions
CAUTION!
Use caution when installing and servicing the furnace
to avoid and control electrostatic discharge; ESD can
impact electronic components. These precautions must
be followed to prevent electrostatic discharge from hand
tools and personnel. Following the precautions will protect
the control from ESD by discharging static electricity
buildup to ground.
1. Disconnect all power to the furnace. Do not touch the
control or the wiring prior to discharging your body’s
electrostatic charge to ground.
2. To ground yourself, touch your hand and tools to a
clean, metal (unpainted) furnace surface near the
control board.
3. Service the furnace after touching the chassis. Your
body will recharge with static electricity as you shuffle
your feet or move around, and you must reground
yourself.
4. Reground yourself if you touch ungrounded items.
5. Before handling a new control, reground yourself; this
will protect the control. Store used and new controls
in separate containers before touching ungrounded
objects.
6. ESD damage can also be prevented by using an ESD
service kit.
CAUTION!
Failure to turn off gas and electric supplies can result in
explosion, fire, death, or personal injury.
6. Disconnect thermostat wires and humidifier wires (if
equipped with a humidifier).
7. Disconnect line voltage, blower, electronic air cleaner
wires (if equipped), and transformer wires.
8. Remove wiring harness edge connector and gasket
from circuit board.
9. Remove screws or any other fasteners and old circuit
board.
10. Examine control and control box to check for water
stains.
11. Make repairs if any sources of water leakage are
found. Be sure to check humidifiers, evaporator coils,
and vent systems in the area of the control.
Step 2: Install the New Control
1. Ground yourself. When handling circuit board, hold it by
the edges.
2. For 90 percent efficient furnaces, clip JW9 jumper wire.
The JW9 jumper is found close to the right hand corner
of the circuit board, beneath the HUM-1 terminal (see
Figure 1). This will result in a 15-second inducer OFF
delay.
3. Insert board’s edge between control box tabs.
4. Fasten circuit board with retaining screws.
IMPORTANT:
For 58EJA or 349MAV horizontal furnaces, the bot-
tom control board bracket may need to be notched
and trimmed to prevent the LED and circuit trace from
interfering with the mounting bracket. This may cause
a short and result in damage to the control.
To prevent:
a. Remove the mounting bracket from the control box.
b. Mark, notch and trim the bracket between where
the bottom center and bottom right mounting holes/
pins align. Be sure to trim enough of the bracket so
the circuitry on the underside of the control board
lies clear of the bracket.
c. Verify clearance by mounting the control board on
the bottom of the support rail.
Step 1: Remove Existing Control
CAUTION!
To service control, and prior to disconnection, label all
wires. Failure to do so may result in wiring errors can
cause dangerous operation.
1. Turn thermostat to OFF position or set it to the lowest
possible setting.
2. Turn OFF electrical supply to furnace.
3. Turn OFF gas supply to furnace.
4. Remove furnace blower and control access doors.
5. Remove control box cover.
• Controlsgasvalve,ignitor,blowermotor,inducer,humidifierandaircleaner
• Microprocessor-based
• Designedfor100%gasshutoffincaseofignitionfailure
• TwinningcompatiblewithotherICM281boards
• Reversepolarityprotection
• Secondarybrownoutvoltageprotection
• Compatiblewith24VACstandardthermostat
• ProvidesdiagnosticLEDtoaidintroubleshooting
Specifications
Electrical
• Voltage Range: Line (98 to 132 VAC) @ 60Hz
• Ignitor: 5A @ 120 VAC
• Cool Blower: 30A, 2HP, 240 VAC
• Heat: 5A , 1/2 HP, 240 VAC
• Inducer Motor: 4A, FL A-8.0 LRA @ 120 VAC
• Gas Valve: 1.5A @ 30 VAC
Features