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1 Blink followed by 2 Sec. Pause- 1 Hr lockout |
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2 Blinks followed by 2 Sec. Pause- Pressure Switch is Open |
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3 Blinks followed by 2 Sec. Pause- Limit Switch is Open |
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4 Blinks followed by 2 Sec. Pause- Pressure Switch is Closed |
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5 Twinning fault |
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| Auxiliary limit switch: located on warm
air blower housing n monitor return air To |
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| Draft safeguard switch: NC, open when detect flu
gas leaking |
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| Manifold pressure: 11" of a manometer, connecting
to gas valve to check |
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| Limit switch: NC. When furnace is overheated
[200_250oF], it open to and close main valve gas |
| Helical bimetal: positioned next to the heat exchanger
control Limit sw and fan sw |
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| Flame proving devices: Thermocouple[15_30 mV],,
thermopile, bimetallic strip, liquid-filled remote bulb. |
| Igniters: Intermittent pilot (IP), Diewct-spark
ignition (DSI), Hot surface ignition(HSI) |
| Gas Pressure : 3.5 WC |
| Pressure SW: NO, 24v terminals continuity when reduced
draft fan working |
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