Aprilaire 1770A - System Setup; Model 8910 Home Comfort Control or Third-Party Control

MODEL 8910 HOME COMFORT CONTROL
™
OR THIRD-PARTY CONTROL
WIRING & DIP SWITCH CONFIGURATION
When used as an external control, the Model 8910 Home Comfort Control
™
or other third-party control acts like a dehumidistat and will turn
the dehumidifier on and off when the relative humidity goes above or below the setting. The Model 8910 Home Comfort Control
™
or other
Third-Party Control must be installed in the space that is being served by the dehumidifier. One example of this would be to install the
Model 8910 Home Comfort Control
™
in the home’s living space and wire it to the dehumidifier which is located in the basement and is ducted
to the HVAC system. The Model 8910 Home Comfort Control
™
or other third-party control will override the dehumidifier control sensors and
on-board control knob setting. Refer to the Model 8910 Home Comfort Control
™
or other third-party control Installation Instructions for location,
mounting, and operating instructions. The dehumidifier control knob can only be used to initiate Test Mode when a Model 8910 Home Comfort
Control
™
or other third-party control is connected.
FIGURE 32 – Third-Party DIP Switch Configuration
90-1538
LOCAL
PRIMARY/SECONDARY
EXTERNAL
SYSTEM SETUP
HVAC FAN ON
VENT-TIMED
VENT-AUTO
PRIMARY
HVAC FAN OFF
ON
1234
SWITCH
FLOATODT
SENSOR
R
C
W
Y
G
A+BDEH
REMOTEHVAC EQUIP
VENT
Cf
Gs Gh
W-
DHRf
DAMPERS
C
R
RC
RH
HC
W
W2
W3
Y
Y2
Y3
C
L
G
DH
VENT
EAC
DH
DH
HUM
HP
B
W2
W
G
O
Y2
Y
nc
com
no
EQ
DEHUMIDIFIER
CONTROL BOARD
HVAC EQUIPMENT
MODEL 8910
HOME COMFORT CONTROL
™
EQUIPMENT CONTROL
MODULE
Wiring Notes:
•DEHoutput(s)oncontrolmustbenormallyopen.
IMPORTANT: The dehumidifier Rf and Cf terminals must be
powered from the transformer that powers the Model 8910 Home
Comfort Control
™
or third-party control.
Third-Party Control with 2 Dehumidifier Connections
1. Connect one thermostat dehumidifier terminal to the Rf terminal on
the dehumidifier control board.
2. Connect the other thermostat dehumidifier terminal to the DH
terminal on the dehumidifier control board.
Third-Party Control with 1 Dehumidifier Connection
Connect the thermostat dehumidifier terminal to the DH terminal on
the dehumidifier control board.
SEQUENCE OF OPERATION
•WhenthemeasuredhumidityisgreaterthanthehumiditysettingontheModel8910HomeComfortControl
™
or other Third-Party Control, the
dehumidifier damper output turns on, the dehumidifier blower turns on, and the green Status LED on the dehumidifier flashes.
•Threesecondsafterthedehumidifierblowerturnson,thecompressorturnsonandthegreenStatusLEDswitchestosolidillumination.
•WhenthemeasuredhumidityfallsbelowthesettingontheModel8910HomeComfortControl
™
or other Third-Party Control, the dehumidifier
damper output turns off and the dehumidifier blower and compressor turn off along with the green Status LED.
FIGURE 31 – Model 8910
Home Comfort Control
™
Wiring
90-1537
21