Installation, Operation & Application Guide
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ICM2811
Integrated Furnace Control Board
Features
• Controls the gas valve, inducer draft motor, circulating
blower and hot surface ignitor
• Monitors system pressure and limit switches
• Microprocessor based precision
• Twinning compatible with another ICM2811 Control
Board
• Diagnostic LEDs aid in testing and troubleshooting
The ICM2811 is a form, fit, and functional replacement for
the Goodman and White Rodgers boards shown in the
cross reference section of this guide. The ICM2811 is an
automated gas ignition control board which monitors the
ignition sequence including the combustion air blower,
pressure switch, hot surface igniter, gas valve, flame sense,
and circulating blower while maintaining full safety circuit
monitoring including the high limit switch, roll out switch
and auxiliary limit switch circuits. Onboard diagnostics will
illuminate a flash code to help technicians properly diagnose
issues quickly.
Introduction
Specifications
• Electrical Rating @ 77°F (25°C)
• Input Voltage: 18-30 VAC, 60 Hz maximum
• HSI Relay: 6.0 amp @ 120 VAC, 60 Hz (resistive)
• Inducer Relay: 2.2 FLA–3.5 LRA @ 120 VAC
• Blower Relay: 14.5 FLA–25.0 LRA @ 120 VAC (2spd–H/C)
• Gas Valve Relay: 1.5 amp @ 25 VAC, 60 Hz 0.6 pf
• Operating Temp Range: -40° to 176°F (-40° to 80°C)
• Humidity Range: 5 to 95% relative humidity (non-condensing)
Replaces
Goodman: PCBBF110, PCBBF123, 0130F00005,
PCBBF112, B18099-26, (PCBBF110S,
PCBBF123S, 0130F00005S, PCBBF112S,
B18099-26S)
White-Rodgers: 50A55-743, 50A55-289, 50T55-289
Upon a call for heat, the thermostat will energize the W
terminal with 24 VAC. With the heat call in place, the inducer
fan and humidifier (optional) will be energized thus closing
a pressure safety switch. The control will enter a 15 second
inducer pre purge cycle. Upon verification of the pressure
switch closure and completion of the 15 second inducer
pre-purge, the hot surface igniter is energized. There is a
9 second igniter warm up period before energizing the gas
valve. Once the gas valve is energized, gas flows into the
burners where it is ignited by the hot surface igniter. Once the
burners are on, the flame is sensed by a flame rectification
circuit and flame sensor. There is a 4 second trial for ignition
period where the control checks the flame signal and proves
the flame. Once flame is proven, the hot surface igniter is
turned off 1 second later and there will be a 30 second delay
before energizing the main blower. When the call for heat
ends, the gas valve is de-energized, burners go off, flame
is proven lost and there is a fixed 15 second inducer post
purge to purge any residual exhaust gases from the system.
Following the inducer post purge the inducer and humidifier
are turned off and subsequently the heat blower is turned off
after the user selected post purge delay time expires.
Upon a call for cooling, the Y terminal is energized with
24 VAC and a 5 second cool blower ON delay begins. After
the ON delay expires, the EAC and cool blower outputs
are energized. Once the call for cooling ends, there is a 45
second cooling blower post purge OFF delay to purge the
residual cool air from the ductwork. At the end of the OFF
delay, the cool blower and EAC are turned off.
Mode of Operation
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.
Electrostatic Discharge (ESD) Precautions
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 the used and new controls in
separate; containers before touching ungrounded objects.
6. ESD damage can also be prevented by using an ESD
service kit.