Aprilaire 1770A - FLOAT SWITCH

TWO ZONE – PRIMARY AND SECONDARY ZONED INSTALLATION (CONTINUED)
FIGURE 18 – Two Zone Wiring
90-1537
DAMPERS
Rf DH -WGhGs
Cf
VENT
HVAC EQUI
PR
EMOTE
DEH B+A
G
R
C
G
W
YY
W
C
R
SENSOR
ODT
FLOAT
SWITCH
24 VAC
(40 VA min)
TRANSFORMER
DEHUMIDIFIER
CONTROL BOARD
HVAC EQUIPMENTTHERMOSTAT
DEHUMIDIFIER SYSTEM DAMPERS
NORMALLY OPEN
(SECONDARY ZONE)
NORMALLY CLOSED
(PRIMARY ZONE)
•HVACFANON:IntheHVACONposition,theHVACfanwillbeturnedononlywhendehumidifyingthePrimaryZone.ActivatingtheHVAC
fan during dehumidification provides better circulation and balancing of indoor air conditions but does not affect moisture removal efficiency.
During Secondary Zone dehumidification, the HVAC fan will not be turned on regardless of the switch position. If the switch is put in the HVAC
FAN OFF position, air is pulled through the unit, dehumidified, and circulated solely by the dehumidifier blower.
•CYCLEPERIOD:Thisdetermineshowfrequentlythedehumidifierwillsampletheairtocheckthehumiditylevel.Setto1hourandadjustas
needed.
•ForVentilationswitchsettings,seeVENTILATIONsectionbeginningonpage14.
•LOCAL/EXTERNAL:IfusingaModel76ExternalControl,Model8910HomeComfortControl
™
, or other Third-Party Control, place the switch in
theEXTERNALposition.Ifnotusinganexternalcontrol,leavetheswitchintheLOCALposition.IMPORTANT: The external control must
be installed in the Primary Zone. See page 19 for Model 76 External Control wiring or page 21 for Model 8910 Home Comfort Control
™
or
Third-Party Control wiring.
FIGURE 19 – Two Zone DIP Switch Settings
90-1538
ON
12344321
ON
HVAC FAN OFF
PRIMARY
VENT-AUTO
VENT-TIMED
HVAC FAN ON
2 HOUR
3 HOUR
30 MIN.
1 HOUR
SYSTEM SETUP
CYCLE PERIOD
EXTERNAL
PRIMARY/SECONDARY
LOCAL
MIN.
30
MIN
MIN.
600
CYCLE TIME
TEST
OFF
WIRING & DIP SWITCH CONFIGURATION
12