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4
Operation
Start Up
1. Open the saddle valve and check for leaks at the connections.
2. Open the bypass damper if installed
3. Turn the furnace on and check for proper operation.
4. Turn the humidistat to the highest level (past 60%) and the humidifier should begin to
operate (the humidifier should stop when the humidistat is turned off, or when the furnace
blower shuts off).
5. Set the furnace controls and humidistat for the desired conditions. 30-40% Relative Humidity
is typically recommended, but it is important to reduce the setting whenever extreme low
outdoor temperatures occur in order to avoid excessive condensation. The settings noted in
the relative humidity table represent the best compromise for both comfort and protection
of home furnishings. Condensation of water on the inside windows is usually an indication
of too high relative humidity.
Outside
Temperature (°F)
40
30
20
10
0
Recommended Relative
Humidity %
45
40
35
30
25
Recommended Relative Humidity Levels
vs. Temperature