ICM Controls ICM2915 Installation, Operation & Application Manual
Also see for ICM2915: Installation, operation & application guide
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Installation, Operation & Application GuideFor more information on our complete range of American-madeproducts – plus wiring diagrams, troubleshooting tips and more,visit us at www.icmcontrols.comICM2915Gas Ignition Replacement Board• 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• 2-stage low heat and high heatFEATURESThe ICM2915 is a form, fit, and functional replacements for the boards shown in the cross-referencesection of this guide. The control boards are designed as automated gas ignition controls which monitorthe ignition sequence including the inducer, pressure switch, spark ignition, gas valve, flame sense, andcirculating blower while maintaining full safety circuit monitoring including the high limit switch, roll outswitch and auxiliary limit switch circuits. Onboard diagnostics will indicate when a fault condition exists.In addition, the ICM2915 offers 2-stage low heat and high heat function for better efficiency.INTRODUCTION• Line voltage: 230 VAC• Line frequency: 50/60 Hz• Control voltage: 18-30 VAC• Circulating blower: 4 FLA @ 277 VAC• Hi-efficiency blower: 10mA @ 24 VAC• Inducer blower: 0.7 FLA, 1.5 LRA @ 24 VAC• Combined gas valve load: 1.5A @ 24 VAC• Minimum flame signal threshold: 0.75 uASPECIFICATIONSTRANE P/N #: D674713P01REPLACESSingle stage operationUpon a thermostat call for W1, the single stage heat mode is initiated. The control will verify the initialstate of the pressure switch and other safeties then engage the draft inducer. The control then veri-fies the closure of the pressure switch and enters a 20-second pre-purge (15 seconds on high speedfollowed by 5 seconds on low speed). After the inducer pre-purge completes, the control energizes thefirst stage of the gas valve and initiates spark which ignites the flame. Once the flame is detected andverified, a 45 second delay for the indoor blower is initiated. Following the delay, the indoor blower isenergized at low speed. When the W1 call from the thermostat is satisfied, the gas valve de-energizes,flame sense is lost, and the control starts a 5 second draft inducer post-purge along with a field selected60 or 90 second indoor blower post-purge delay. After their delay times expire, the inducer and indoorblowers will be de-energized.Second stage operationWhen a call for second stage heat (W2) occurs during a first stage heat call (W1), the control changesthe draft inducer speed from low to high speed. Also, the control will switch the first stage gas heat tothe second stage gas heat. Once the call for second stage heat (W2) is satisfied, the draft inducer isswitched from high speed to low speed, the gas valve is switched from second stage to first stage, andthe indoor blower speed will switch from high to low within 30s.First stage and second stage called together at the same timeThe control initially processes the call as a single stage heat call. Once flame is established, the controlbegins to process a second stage heat call operation after 10 minutes.Note: A call for W2 without a call for W1 will not be recognized.Cooling modeUpon a thermostat call for cooling (Y) energized or (Y&G) energized, the control energizes the indoorblower on high speed. When the thermostat is satisfied, the control executes a field selectable 0 or 45second indoor blower post purge off-delay. When the off-delay ends, the Indoor blower is turned off.Continuous fan modeUpon a singular (G) input which indicates a call for continuous indoor blower operation, the control willenergize the indoor blower at the low heat speed.OPERATIONUse caution when installing and servicing the furnace to avoid and control electrostaticdischarge; ESD can impact electronic components. These precautions must be followed toprevent electrostatic discharge from hand tools and personnel. Following the precautions willprotect 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 yourbody’s electrostatic charge to ground.2. To ground yourself, touch your hand and tools to a clean, metal (unpainted) furnace surface nearthe control board.3. Service the furnace after touching the chassis. Your body will recharge with static electricity as youshuffle 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 andnew controls in separate; containers before touching ungrounded objects.6. ESD damage can also be prevented by using an ESD service kit.ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONSELECTRICAL SHOCK HAZARD! Before installing this unit, turn off power at themain service panel by removing the fuse or switching the appropriate circuit breaker tothe OFF position. Follow all Local, State and National Electrical Codes when installingthis device.CAUTION! Only trained personnel should install or service heating equipment. Whenworking with heating equipment, be sure to read and understand all precautions in thedocumentation, on labels, and on tags that accompany the equipment. Failure to followall safety guidelines may result in damage to equipment, severe personal injury or death.> > > CAUTION < < <CAUTION! To service control, and prior to disconnection, label all wires. Failure to do so mayresult 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 orpersonal 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, evaporatorcoils and vent systems in the area of the control.REMOVE EXISTING CONTROL1. 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.INSTALL NEW CONTROLThe 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) 3 times in one heat call• Flame lost after successful ignition 4 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 callFlame sensed while the gas valve is closed puts the control in lockout state, but lockout clears after theblower off delay is complete (90 seconds or 60 seconds, depending on jumper selection).LOCKOUTFAULT CODE TABLE# of Flashes ErrorSteady OFF No power or board failureSteady ON Normal operation with no thermostat callSlow flash rate Normal operation with a heat call2 System lockout3 Pressure switch fault4 High temperature limit switch open5 Flame sensed without gas valve open or flame sensed without W call6 Flame roll out switch open7 Thermostat miswired (W1 & W2 reversed)8 Low flame sense signalNOTE: At power up, the control will flash the last 4 faults stored in memory within the last 14 daysFunction Time UnitsHeat “ON” delay 45 SecCool “ON” delay 1 SecFlame recognition time 0.8 SecFlame establishing period 7 SecFlame failure response time (before 10seconds after trial for ignition period)2 SecFlame failure response time (otherwise) 0.8 SecRecycle time 20 SecLockout time 300 SecPre–purge time 20 SecRetry Time 60 SecPost–purge time 5 SecAuto-restart purge time 5 SecTrial for ignition period 7 SecInterpurge time 60 SecAuto restart time 60 MinRetry 2 EachRecycle Attempts 4 EachHeat 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.Timing: (@ 25 VAC, 60 Hz, 25ºC unless noted)Slow Flash: Normal operation with call for heatSteady Flash: Normal operation without a call for heatSTATUS LEDWhen powering on, the control shall flash the last four error codes that have occurred in the last 14days. The control will flash the newest error first and oldest error last. The fault memory can bemanually erased by powering on with a G call in place and toggling W 3 timesFault code Retrieval & ClearingLIAF315.indd 1LIAF315.indd 1 4/14/22 11:14 AM4/14/22 11:14 AM |
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