Manual Mode; Operating Instructions - Models 350, 360, 500M, 600M & 700M; Check The Humidifier Operation - Aprilaire 360 Owner's Manual

MANUAL MODE

FIGURE B – Manual Mode
Your Automatic Digital Humidifier Control is installed in the cold air return.
When installed in the Manual Mode (see Figure B), it is important to
anticipate a drop in outdoor temperature and reduce the setting accordingly
to avoid excessive condensation. For example, with an outdoor temperature
of 20°F the correct setting will be 35% RH. If the temperature is expected to
fall to 0°F that evening, then merely reduce the setting to 25% several hours
prior to the temperature change.
The recommended settings on the Humidifier Control are based on years of
research (see Table 3) for the average home. These settings represent a
compromise between RH levels that would be most desirable for comfort
reasons and humidity levels that are suitable for protection of your home and to
avoid condensation on your windows. For example, a wintertime indoor RH of
50% may be considered ideal for comfort, but unfortunately, it probably would
result in condensation, which can cause damage to your home. Observing the
recommended RH levels on your Humidifier Control is an important safeguard.
Condensation of water on the inside surface of windows in the form of fogging
or frost is usually an indication of too much RH. This same condensation can
take place in other areas in your home with the possibility of damage resulting.
TABLE 3 – Outdoor Temperature/ Indoor Relative Humidity
Outside Temperature
+40°F
+30°F
+20°F
+10°F
0°F
– 10°F
– 20°F
Recommended RH
45%
40%
35%
30%
25%
20%
15%
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OPERATING INSTRUCTIONS –
MODELS 350, 360, 500M, 600M & 700M
FIGURE C – Manual Humidifier Control
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Your Aprilaire humidifier is controlled by a Manual Humidifier Control (see
Figure C). The Manual Humidifier Control is installed either in the cold air
return duct or on an interior wall of the home. It is important to anticipate a
drop in outdoor temperature and reduce the setting accordingly to avoid
excessive condensation, just as with the Automatic Digital Humidifier
Control installed in Manual Mode (see page 8).
To determine the indoor RH, slowly turn the knob clockwise and counterclockwise
and listen for 2 clicks. The indoor RH is within the range of the 2 clicks.

CHECK THE HUMIDIFIER OPERATION

AUTOMATIC DIGITAL HUMIDIFIER CONTROL
Set the knob to "Test/Reset", make sure that the water saddle valve is open
and that there is electricity to the humidifier. The furnace blower motor
must be operating and the furnace calling for heat for the humidifier to
function. Note: Turning the knob to "Test/Reset" resets the "Change Water
Panel" internal timer. In addition, at this setting, the humidifier will only
operate for 1 minute. Reduce the Humidifier Control setting to the
recommended inside RH, depending on the outside temperature. DO NOT
LEAVE IN TEST MODE AS HUMIDIFIER WILL NOT OPERATE. Follow
the suggested settings prior to a drop in the outside temperature.
MANUAL HUMIDIFIER CONTROL
Set the knob to the highest setting, make sure that the water saddle valve is
open and that there is electricity to the humidifier. The furnace must be
operating for the humidifier to function. Once water is entering the humidifier
and coming out at the drain, reset the Humidifier Control to its original setting.
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