Aprilaire 1750A Installation Instructions Manual page 12

TWO ZONE – PRIMARy AND SECONDARy ZONED INSTAllATION
WIRING & DIP SWITCH CONfIGURATION
fIGURE 18 – Two Zone Wiring
DEHUMIDIFIER SYSTEM DAMPERS
NORMALLY OPEN NORMALLY CLOSED
(SECONDARY ZONE) (PRIMARY ZONE)
THERMOSTAT
R
C
G
W
Y
90-1537
• H VAC 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 .
• C YCLE PERIOD: This determines how frequently the dehumidifier will sample the air to check the humidity level. Set to 1 hour and adjust as
needed .
• F or Ventilation switch settings, see VENTILATION section beginning on page 14.
• L OCAL/EXTERNAL: If using a Model 76 External Control, Model 8910 Home Comfort Control
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
Third-Party Control wiring .
12
DEHUMIDIFIER
24 VAC
CONTROL BOARD
(40 VA min)
TRANSFORMER
HVAC EQUIPMENT
R
C
G
W
Y
(CONTINUED)
fIGURE 19 – Two Zone DIP Switch Settings
SYSTEM SETUP
LOCAL
HVAC FAN OFF
PRIMARY
VENT-AUTO
CYCLE PERIOD
90-1538
30
MIN.
0
MIN
OFF
CYCLE TIME
, or other Third-Party Control, place the switch in
™
EXTERNAL
HVAC FAN ON
PRIMARY/SECONDARY
VENT-TIMED
30 MIN.
1 HOUR
2 HOUR
3 HOUR
60
MIN.
TEST
or
™