Bard W24G2DA Installation Instructions Manual

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Bard W24G2DA Installation Instructions Manual Manual pdf 48 page image

Manual 2100-592CPage 48 of 69TABLE 16Integrated Furnace and Blower Control OperationIGNITION SEQUENCE CONTROLIgnition Source 24 VAC DSIFlame Sensing RemoteTimings- Prepurge- Postpurge- Inter-trial purge- Pressure switch proving period- Trials for ignition- Trial for ignition- Ignition sequence lockout- Heat blower on - delay- Heat blower off - delay- Cool blower on - delay- Cool blower off - delay- Manual fan operations- High limit control operation- Flame rollout switch operation15 seconds30 seconds (0 if cycle terminated before valve “on”)15 seconds60 seconds3 per ignition sequence7 seconds total time to prove flame60 minutes (after 3 trials for ignition), auto reset- can be reset during the 60-minute lockout period by opening thermostatcircuit for 3 seconds or more30 seconds (timing starts when ignitor cycles off)90, 120, 150 seconds selectable; factory set at 1207 seconds60 secondsOperates on selected heating speed and cycles off during ignition or burnerstart-up sequence.Automatic reset, ignition sequence restart. See Note 1.Manual reset, igniton sequence initiated after switch is manually reset.See Note 1.NOTE 1: After the fourth limit trip on a given call for heat, there will be a 1-hour delay before the ignition sequence will restart.After either high limit switch or flame rollout switch actuation, the inducer will operate for the 30-second postpurge and thecomfort air blower will operate for the selected off delay. If on Manual Fan operation, the comfort air blower will continue tooperate.SAFETY UNITSHigh limit/RolloutPressure switchSPST in 24 VoltSPST, safe start checkCOMFORT FAN CONTROLHeating Speed FanNormal operation- ON delay- OFF delayLimit OperationFlame Sense30 seconds fixed. Timing starts when igniter de-energized.3 selectable timings – 120 seconds standard can be changed to 90 or 150seconds.ON when limit OPENOFF after OFF delay when limit CLOSESON if flame is sensed and there is no call for heat.Cooling Speed Fan- ON delay- OFF delay7 seconds60 secondsManual Fan ON continuously on HEATING speed. When call for cool, the fan switchesto COOLING speed. Then when thermostat satisfied, the fan switches backto HEATING speed after COOLING OFF delay.DIAGNOSTIC INDICATORA red LED is provided to indicate system faults as follows:Steady ON - Control okay in standby, call for heat, cool or fan modesSteady OFF - Internal control fault or no power. Also check 3A fuse on control.1 flash - Lockout due to failed ignition or flame dropouts2 flashes - Pressure switch open with inducer on3 flashes - Pressure switch is closed with inducer off4 flashes - Limit switch is open5 flashes - Flame detected with gas valve closed6 flashes - Compressor output delayed from short cycle/staging timerThe flash rate is 0.25 seconds on, 0.25 seconds off with 2.0 seconds pause between flash codes.