ICP 9MAC/E series Troubleshooting Manual

Contents

ICP 9MAC/E series Troubleshooting Manual Manual pdf 45 page image

- 45 -APPENDIX EQUICK REFERENCE INFORMATIONPRESSURE SWITCH MAKE/BREAK POINTSUNIT SIZE(BTUH)HIGH PRESSURE SWITCH MEDIUM PRESSURE SWITCH LOW PRESSURE SWITCHMake Point Break Point Make Point Break Point Make Point Break Point60,000(17.5” casing) 1.21 in.wc max 1.05 in. wc +/-0.06 0.85 in. wc max 0.70 in. wc +/-0.05 0.62 in. wc max 0.47 in. wc +/-0.0560,000(21” casing) 1.46 in.wc max 1.29 in. wc +/-0.07 1.00 in. wc max 0.85 in. wc +/-0.05 0.64 in. wc max 0.49 in. wc +/-0.0580,000 1.58 in.wc max 1.40 in. wc +/-0.08 1.00 in. wc max 0.85 in. wc +/-0.05 0.75 in. wc max 0.60 in. wc +/-0.05100,000 1.58 in.wc max 1.40 in. wc +/-0.08 1.08 in. wc max 0.93 in. wc +/-0.05 0.87 in. wc max 0.72 in. wc +/-0.05120,000 1.58 in.wc max 1.40 in. wc +/-0.08 1.05 in. wc max 0.90 in. wc +/-0.05 0.80 in. wc max 0.65 in. wc +/-0.05Flame Sensor Microamperage:Microamp Range: 0.5 to 6.0 microampsTypical Reading: 4 to 6 microampsHot Surface Igniter Reading:The Silicon Nitride igniter in this furnace is not voltage sensitive and will work within the voltage range of 102 to 132 VAC. Hence, there is novoltage regulation circuits on the furnace control board. A new Silicon Nitride igniter has a normal resistance range of 40 to 70 ohms at roomtemperature and is relatively stable over the life of the igniter. The igniter resistance will increase with temperatures above room temperature.Ohm reading of HSI @ 70°F: 40 to 70 ohms (resistance will remain relatively stable over the life of the igniter).Gas Valve Ohm Readings:PL17-5 to PL17-4: Resistance cannot be measured with an ohm meter because there is a bridge rectifier in the gas valve circuit.Power Choke (Inductor):Run unit in cooling mode, measure motor amp draw before power choke. Then re-run unit in cooling mode, but this time measure amp draw withoutpower choke in line. The amp draw should be higher without power choke. Some ammeters will register a lower amp draw (look for a change inamperage).440 08 4001 00

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