DAISY CHAIN WIRING
Anden dehumidifiers can be wired in a daisy chain application, allowing one Model A77 or alternate dry contact dehumidistat to control any number
of dehumidifiers wired together� Reference the dehumidifier Installation and Operation Manual for detailed set-up and operation�
MODEL A77 AS DRIVING CONTROL
When a Model A77 is used to control the first dehumidifier, Unit #1 must be set to REMOTE ENABLED in the set-up menu� All downstream units must
be set up to EXTERNAL ENABLED in each set-up menu� See pages 11 and 12 for set up details, and wire as shown in FIGURE 13�
SEQUENCE OF OPERATION
Each unit in the daisy chain responds to the first unit being controlled by the A77� When the humidity level rises above the humidity setting, all units
will dehumidify until the humidity measured by the A77 falls below the setting�
IMPORTANT: If the A77 or first dehumidifier experiences a fault or loses power, all downstream dehumidifiers will also stop function� If any
dehumidifier in the daisy chain other than Unit #1 experiences a fault, that unit will stop operation as determined by the fault but all other units will
continue operating� If any dehumidifier loses power, all downstream units will stop function�
+ - A B ODT
SensorRemote
Gh Rf Cf Gs YW
HVAC EQUIP.
DH
DH
R/+
C/-
B
A
Float
Switch
DHDH
Vent
+ - A B ODT
SensorRemote
Gh Rf Cf Gs YW
HVAC EQUIP.
Float
Switch
DHDH
Vent
+ - A B ODT
SensorRemote
Gh Rf Cf Gs YW
HVAC EQUIP.
Float
Switch
DHDH
Vent
DEH DEH DEH
SET UP FOR REMOTE CONTROL
MODEL A77 CONTROL
SET UP FOR EXTERNAL CONTROL
SET UP FOR EXTERNAL CONTROL
90-2508
FIGURE 13 – WIRING WITH A77 CONTROL
English 13