DriSteem RL-3 - Daisy Chain Wiring

45
DEHUMIDIFIER INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
INSTALLATION
+ - 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
UNIT #1
SET UP FOR REMOTE CONTROL
MODEL D77 CONTROL
UNIT #2
SET UP FOR EXTERNAL CONTROL
UNIT #3
SET UP FOR EXTERNAL CONTROL
90-2508
Daisy chain wiring
DriSteem dehumidifiers can be wired in a daisy chain application, allowing
one Model D77 or alternate dry contact humidistat to control any number of
dehumidifiers wired together.
MODEL D77 AS DRIVING CONTROL
When a Model D77 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 42 through 44 for
set up details, and wire as shown in Figure 45-1.
SEQUENCE OF OPERATION
Each unit in the daisy chain responds to the first unit being controlled by the
D77. When the humidity level rises above the humidity setting, all units will
dehumidify until the humidity measured by the D77 falls below the setting.
IMPORTANT: If the D77 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 operating.
FIGURE 45-1: WIRING WITH D77 CONTROL