I. PRINCIPLE OF OPERATION
The purpose of the Aprilaire
®
Dehumidifier is to keep humidity in the house at
acceptable limits to reduce the unwanted effects of high humidity. The
dehumidifier measures the condition of the house air to decide when to run.
II. OPERATING INSTRUCTIONS
There are three adjustable settings: the dryness setting, the air cycle period
and the air cycle time within that period. The dehumidifier can be set from “1” or
“LESS DRY” to “7” or “MORE DRY” based on desired comfort level. Most
installations should be initially set to the “3” or “NORMAL” setting; however this
can be adjusted to your individual needs.
1. ADJUSTING THE DEHUMIDIFIER SET POINT
Use the main control knob (Figure 1) on
the outside of the unit to set the
dehumidifier dryness setting. Start with a
“NORMAL” setting for most installations.
Moving the knob clockwise to “MORE
DRY” will make conditions drier. Moving
the knob toward “LESS DRY”
allows for
higher moisture levels.
Based on the thermostat set point, use the
following table to determine the control
knob setting to reach the desired RH value. The dehumidifier will work to achieve
these values.
IV. MAINTENANCE
AIR FILTER
Under normal circumstances, the filter in the dehumidifier should be cleaned or
replaced once a year. A clean filter is necessary to prevent damage to the
dehumidifier and allow it to function at full capacity. To remove the filter, first
unplug or disconnect power to the dehumidifier, then remove the air filter via the
access panel on the side of the dehumidifier. To clean, flush with warm water and
detergent solution. After a clean or new filter is reinstalled, replace the access
panel and reconnect power to the dehumidifier. The replacement filter for the
dehumidifier is Model 4510 and is available from your installing contractor or from
most other HVAC contractors in your area.
DRAIN
The drain trap or outlet should be checked and cleaned of debris annually.
Flush it with water under pressure to ensure opening is clear.
%RH (± 5%) based on Control Knob Setting and Indoor Temperature
Control Knob
Indoor Temperature(°F)
Setting
65
70
75
80
1 - “LESS DRY”
84%
71%
60%
2
86%
73%
61%
52%
3 - “NORMAL”
74%
63%
53%
45%
4
64%
54%
45%
39%
5
55%
46%
39%
33%
6
47%
39%
33%
28%
7 - “MORE DRY”
40%
34%
28%
24%
NOTES:
1. %RH values are ±5% and are to be
used as a GUIDE ONLY for initial set-
up.
2. Indoor Temperature is measured at
the inlet to the Model 1700.
EXAMPLE: At an indoor
temperature of 75°F with a
dehumidifier control knob setting
of 3 - NORMAL, the dehumidifier
will work to achieve an RH value
of 53%.
