SySTEM CHECKOUT
DEHUMIDIfICATION
1 . Check the wiring to the HVAC equipment and any accessories if applicable .
2 . Plug unit in and turn on/off switch to ON .
3 . Wait 5 seconds then rotate the main control knob clockwise to the TEST position .
4 . If set up correctly, the dehumidifier blower will turn on and the dehumidifier damper
output will turn on . After 3 minutes the dehumidifier compressor will turn on . The blower
and compressor will remain on for 1 minute in TEST mode . After 1 minute has elapsed,
the dehumidifier blower and compressor will turn off and the dehumidifier damper output
will turn off .
5 . The Status LED will blink red and green alternately if the control knob has been left in
TEST after the compressor has turned off .
ADJUSTING DEHUMIDIfIER SETTING
1 . Use the control knob on the unit to set the desired dryness level .
• Based on indoor temperature, use
Table 6
to determine the control knob setting to achieve the desired humidity level .
• For most installations, start with a setting in the NORMAL range. See
figure 33
.
• Moving the knob clockwise towards MORE will increase dehumidifier run time, allowing for lower humidity levels.
• Moving the knob counterclockwise towards LESS will decrease dehumidifier run time, allowing for higher humidity levels.
2 . Reference the Installation Instructions for the Model 76 Control, Model 8910 Home Comfort Control
™
, or Third-Party Control for setting adjustments .
fIGURE 33 – Control Knob Setpoint
90-1327
EXAMPlE:
At an indoor temperature of
75°f
and a control knob setting of
3 (56°f DP)
,
the dehumidifier will work to achieve a
53%
humidity level .
• The %RH values are ± 5% and are to be
used as a
GUIDE ONly
for initial set-up .
• Indoor temperature is measured at the inlet
to the dehumidifier .
TAblE 6 – %RH (± 5%) based on Control Knob Setting & Indoor Temperature
Control Knob Setting
& Dew Point
Indoor Temperature
65°f
70°f
75°f
80°f
1 – Less, 65°F DP
84%
71%
60%
2 – 60°F DP
86%
73%
61%
52%
3 – Normal, 56°F DP
74%
63%
53%
45%
4 – Normal, 52°F DP
64%
54%
45%
39%
5 – Normal, 48°F DP
55%
46%
39%
33%
6 – 44°F DP
47%
39%
33%
28%
7 – More, 40°F DP
40%
34%
28%
24%
VENTIlATION
1 . Verify 24 VAC is applied in series with the normally-closed damper and connected to the VENT
DAMPER terminals on the dehumidifier control board .
2 . Remove the wiring access door and rotate the CYCLE TIME potentiometer clockwise to the TEST
position . See
figure 34
.
3 . If set up properly, the HVAC blower will turn on and the ventilation damper will open . The HVAC
blower will remain on and the ventilation damper will remain open for 1 minute or until the dial is
turned out of the TEST position .
DO NOT leave CyClE TIME set to TEST.
If the HVAC blower
fails to turn on or the damper fails to open, refer to the Troubleshooting Guide .
fIGURE 34 – Ventilation Test
MIN.
30
MIN
MIN.
60
0
CYCLE TIME
TEST
OFF
VENTILATION TEST
90-1538
22
