ICM Controls ICM2916 Installation, Operation & Application Manual

Gas Ignition Replacement Board
Installation, Operation & Application Guide
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• Controls blower motors, gas valve, & spark ignitor in sequence
• Protects against short cycling
• Selectable Heat/Cool blower off-delay time
• Flash codes from the onboard LED indicate specific problems for easier troubleshooting
• Repeated ignition failures or flame losses will disable heat operation for safety
INTRODUCTION
The ICM 2916 is a form, fit, and functional replacements for the boards shown in the cross-reference
section of this guide. The control boards are designed as automated gas ignition controls which monitor
the ignition sequence including the inducer, pressure switch, spark ignition, 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 indicate when a fault condition exists.
SPECIFICATIONS
• Line voltage: 230 VAC
• Line frequency: 50/60 Hz
• Control voltage: 18-30 VAC
• Circulating blower: 4FLA @ 277 VAC
• Hi-efficiency blower: 10 mA @ 24 VAC
• Inducer blower: 0.7 FLA, 1.5 LRA @ 240 VAC
• Combined gas valve load: 1.5 A @ 24 VAC
• Minimum flame signal threshold: 0.75 uA
TRANE P/N #: D674712P02
On a call for heat (24 VAC on the W input), the following occurs:
• Upon a call for heat the control checks the status of the pressure switch; if the pressure switch is open,
the control will energize the draft inducer.
• When the control verifies the pressure switch has closed, the control will start a 20-second prepurge.
• When the pre-purge time delay is over, the control will energize the gas valve and initiate spark.
• The ignitor must be de-energized when the flame is sensed or at the conclusion of the trial for ignition
period, whichever comes first.
• When flame is sensed, the control will energize the circulator fan within the ON-delay period.
When the call for heat is terminated, the following occurs:
• The control shall de-energize the gas valve and the draft inducer within the post purge period.
• When the heat mode fan OFF delay timer expires, the control will de-energize the circulator fan.
With a call for cooling, the following occurs:
On a call for cooling (24Vac on Y and G), the circulator fan is energized within the cool on delay period.
The control will ignore a call for Y without a call for G. After the thermostat is satisfied, the compressor
is de-energized and the jumper selected cool Off delay period begins. Following the cooling Off delay
period, the circulator fan is de-energized.
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS
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 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.
> > > CAUTION < < <
ELECTRICAL SHOCK HAZARD! Before installing this unit, turn off power at the
main service panel by removing the fuse or switching the appropriate circuit breaker to
the OFF position. Follow all Local, State and National Electrical Codes when installing
this device.
CAUTION! 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.
LIAF316.indd 1 LIAF316.indd 1
ICM2916
FEATURES
REPLACES
OPERATION
REMOVE EXISTING CONTROL
CAUTION! To service control, and prior to disconnection, label all wires. Failure to do so may
result in wiring errors that can cause dangerous operation.
1. Turn thermostat to the OFF position or set it to the lowest possible setting.
2. Turn OFF the electrical supply to furnace.
3. Turn OFF the gas supply to furnace.
CAUTION! Failure to turn off gas and electric supplies can result in explosion, fire, death or
personal injury.
4. Remove the furnace blower and control access doors.
5. Disconnect the thermostat wires and humidifier wires (if equipped with a humidifier).
6. Disconnect the line voltage, blower, electronic air cleaner wires (if equipped) and transformer wires.
7. Remove screws and any other fasteners and the old circuit board.
8. Examine the control and the control box for water stains.
9. 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.
INSTALL NEW CONTROL
1. Ground yourself. When handling the circuit board; hold it by the edges.
2. Fasten the circuit board with the retaining screws.
3. Connect all line voltage, low voltage and accessory wires.
4. Verify the sequence of operation.
(@ 25 VAC, 60 Hz, 25ºC unless noted)
Function Time
Heat "ON" delay 30
Cool "ON" delay 2
Flame recognition time 0.8
Flame establishing period 7
Flame failure response time (before 10 2
seconds after trial for ignition period)
Flame failure response time (otherwise) 0.8
Recycle time 27
Lockout time 300
Pre–purge time 20
Post–purge time 5
Auto-restart purge time 5
Trial for ignition period 7
Interpurge time 60
Auto restart time 60
Retry 2
Recycle 10
Heat fan OFF delay 60 or 90 sec., field selectable, default will be 90 sec.
Cool fan OFF delay 0 or 45 sec., field selectable, 45 sec. will be default for
HEM, 45 sec. will be default for PSC.
SPECIAL FEATURES
Automatic Restart Purge
Lockout resets automatically after 1 hour. Whether a call is in place or not, the control activates the
inducer blower for 5 seconds. The inducer will deactivate and ensure the pressure switch is not stuck
closed before starting a new heat call.
Automatic Inducer Pre-purge Reset
If the pressure switch remains open after 2 minutes of draft inducer run time, the draft inducer will be de-
energized for 30 seconds. The sequence will start again checking for an open pressure switch.
Continuous Fan Off delay (single stage units only)
On a call for continuous fan (24 VAC on G), the circulator fan is energized. During a call for cooling
while the cool "On" delay is in place, the control will not respond to the fan input (G). If the fan was
called prior to the call for cool, the circulator fan will remain energized during the Cool "On" delay. When
the call for continuous fan is terminated, the selected cool Off delay period begins. When the cool Off
delay period expires, the circulator fan is de-energized. Note: If the fan is called prior to a call for heat,
the circulator fan will remain energized during the entire call for heat sequence.
Fault Code Retrieval
When powering on, the control flashes the last four error codes that have occurred in the last 14 days.
The control will flash the newest error first and oldest error last. The fault memory can be manually
erased by powering on with a G call in place and toggling W three times.
Flame Sense Test Points
The ignition board is equipped with a set of flame sense test points. A multimeter can be used to test
flame sense by placing the meters probes on the two test pins and taking a DC voltage reading while
the flame sensor is in the presence of flame. 1VDC = 1µA flame current. Weak or poor flame sense is
represented by a reading of 0.7 VDC or lower.
The control will go into a 1-hour soft lockout if the following faults are detected:
• Limit switch open 4 times in one heat call
• Ignition failed (flame not sensed) 4 times in one heat call
• Flame lost after successful ignition 3 times in one heat call
• Gas valve sensed on when it should not be
• Gas valve sensed off when it should be on, 10 times in one heat call
Flame sensed while the gas valve is closed puts the control in lockout state, but lockout clears after the
blower off delay is complete (90 seconds or 60 seconds, depending on jumper selection).
FAULT CODE TABLE
Fault code retrieval & clearing
# of Flashes
When powering on, the control
2
flashes the last four error codes that
have occurred in the last 14 days.
The control will flash the newest error
3
first and oldest error last. The fault
4
memory can be manually erased by
powering on with a G call in place
5
and toggling W 3 times.
6
Two LED's on the board
• Status LED (Green)
7
– Slow Flash: Normal operation
8
with no call for heat
– Fast Flash: Normal operation with
Solid Red
call for heat
Solid Red w/solid
• Fault LED (Red)
'STATUS' LED
– See table
TIMING
LOCKOUT
Error
External lockout (retries or recycles
exceeded)
Pressure switch/Inducer error
Open limit switch and rollout
Flame sensed when no flame should
be present
Not used
External gas valve circuit error
Low flame sense
Internal board error
Continuous reset caused by an internal
board error
Units
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Min
Each
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