System Checkout; System Setup; Maintenance - Aprilaire 1720 Installation,Safety & Maintenance Manual

SYSTEM CHECKOUT

1. Check the wiring to the HVAC equipment.
2. Rotate the main control knob clockwise to the "TEST" position.
3. If all is set up properly, the dehumidifier blower will turn on.
The compressor will turn on after the dehumidifier blower
has run for 30 seconds. After 1 minute the dehumidifier
blower and compressor will shut off ("TEST" mode only).
4. If the dehumidifier blower does not activate in TEST mode,
refer to the Troubleshooting Guide.
5. For ventilation (optional) test, be sure that 24 VAC is applied
in series with the Aprilaire
(Model 6506) and connected to the "VENT DAMPER"
terminals on the dehumidifier control.

SYSTEM SETUP

ADJUSTING THE DEHUMIDIFIER SET POINT
Use the main control knob (Figure 19)
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.

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.
Note: The drain trap needs to be primed with water prior to unit operation. The drain trap needs to be primed with water prior
to start-up and after extended periods of unit shutdown (winter months).
® Normally-Closed Damper
Setting
1
2
3
4
5
6
7
6. Rotate the "CYCLE TIME" potentiometer clockwise to the
"TEST" position.
7. If all is set up properly, the HVAC blower will turn on and the
ventilation damper will open. Both should be audible to the
installer. The HVAC blower will remain on and the ventilation
damper will remain open for 1 minute or until the dial is
turned from the "TEST" position, whichever happens first.
8. If the optional ventilation damper or HVAC blower does not
activate in TEST mode, refer to the Troubleshooting Guide.
Dewpoint Set Point (°F)
65
60
56
52
48
44
40
FIGURE 19
90-782
13