MODEL 340MAV, 350MAV, 355MAV CONDENSING GAS …

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place. See “Performing Routine Main-tenance” section in this manual. Then proceed as follows: STEPS FOR STARTING YOUR FURNACE 1. Set your room thermostat to the lowest temperature setting. (See Fig. 8.)! WARNING If overheating occurs or the gas valve fails to shut off the gas supply, turn off the exter-nal manual gas valve to the

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