506228−01 05/09
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Wiring Diagrams
Thermostat wiring connections with various units, including dual fuel, zone control, and applications that include the Humiditrol
®
Enhanced Dehu-
midification Accessory (EDA). See figures 17, 18 and 19. For whole home dehumidifier, refer to the installation instruction for the dehumidifier.
RED
YEL
BLU
BLK
BRN
L7742U
THERMOSTAT
TYPICAL INDOOR
UNIT; SEE
SPECIFIC MODEL
FOR ACTUAL
TERMINAL
LAYOUT
TYPICAL
2−STAGE
OUTDOOR UNIT
PUR
OUTDOOR
SENSOR
(X2658)
BLK
Y1Y2 JUMPER (OR
ON−BOARD CLIPPABLE
LINK) − IN FOR SINGLE−
STAGE COOLING;
REMOVED FOR 2−STAGE
COOLING
RED
BLK
PUR
EDA UNIT
FAN RELAY
REMOVE Y1 TO DS OR R TO
DS JUMPER IN INDOOR UNIT
FOR HUMIDITROL
APPLICATION
NOT REQUIRED FOR APPLICATIONS WITHOUT LSOM
NOT REQUIRED FOR SINGLE STAGE
NOTE − FAN
RELAY NOT
REQUIRED WITH
SINGLE-SPEED
OUTDOOR FAN
NOTE − SEE EDA INSTALLATION
INSTRUCTIONS FOR FAN
CONTACT WIRING
Figure 17. Enhanced Dehumidification Accessory Typical Wiring Diagram
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