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Originally Posted by ajschlee  How can I tell if the Sail switch is needed for the humidifier install? |
You won't need it..
Photo below is mine.. behind this cover (Turn power OFF), there a wire taped "HUM" on it.. A knock out to mount the transformer to as seen below.
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| Also, is it better to hook to hot or cold water line? |
They say it don't matter.. I think it does better with hot water, you get more more humidity with hot water than cold.
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| How many gallons flow through in a cold day with the furnace running? |
From Honeywell's web page.
How much water should my humidifier use?
The amount of water that a humidifier uses depends on the type of humidifier.
A flow through humidifier (HE220/HE250 will use about three gallons of water per hour of operation. One half to three quarters of a gallon will be evaporated per hour to condition the air, while the rest flows down the humidifier pad. As it does so, the water flushes mineral deposits down the drain, thereby allowing longer service intervals between pad replacement.