+ - A B
ODT
Sensor
Remote
Gh
Rf
Cf
Gs
Y
W
HV
AC EQUIP
.
Y6456 CONTROL
FLOA
T
Switch
DH
DH
VENT DEH
Dampers
NC NO
NO/NC SWITCH
DH
DH
R/+
C/-
B
A
90-1862
+ - A B
ODT
Sensor
Remote
Gh
Rf
Cf
Gs
Y
W
HV
AC EQUIP
.
DH
DH
R/+
C/-
B
A
Y6456 CONTROL
90-1860
NOTE:
Use 18-22 AWG wire for control
wiring.
EXTERNAL CONTROL
Used as an external control, the Y6456
is mounted in the space that is to be
dehumidified. When the dehumidifier is
powered, the display on the dehumidifier
control will show “EXTERNAL” to indicate
that an external control is being used.
External controls are recommended when
the dehumidifier is installed in an attic and
is ducted to the HVAC system.
The Y6456 uses a normally open (NO),
dry contact (i.e. not a triac or other
semiconductor) relay to complete the
circuit between the DH terminals of the
dehumidifier control. If using other controls
such as a thermostat with dehumidification
outputs, ensure the output is a dry contact
type and set the NO/NC switch on the
dehumidifier control (see
Figure 20
) to
correspond with the control being used.
If an external control is used in a zoned
application, it must be located in the
Primary Zone (refer to TWO ZONE –
PRIMARY AND SECONDARY zoned
installation on page 15 for details).
NOTE: When using an external control,
there is a 3 minute delay at start up
or whenever power is cycled to the
dehumidifier.
CRAWL SPACE/SEALED ATTIC
CONTROL
Used as crawl space or sealed attic control
(or wired remote control), the Y6456 is
mounted in the living space while the
dehumidifier is located in the area to be
dehumidified. When the dehumidifier is
powered, the display on the dehumidifier
control will show “REMOTE” to indicate
that a wired remote control is being used.
The RH shown on the Y6456 is the RH
measured at the dehumidifier.
Wired remote control is typically used for
crawl space or sealed attic applications, but
is also recommended when the dehumidifier
and the space being dehumidified are
inconvenient or difficult for the homeowner
to access. Examples of this type of
application include basements that may
be inconvenient to access or storage areas.
Y6456 – External Control or Crawl Space/Sealed Attic Control and Wiring
Figure 20. Y6456 External Control Wiring
Figure 21. Y6456 Crawl Space/Sealed Attic (Wired Remote) Wiring
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