ComfortSenset Model L7742U Touch Screen
7−Day Programmable Thermostat
Page 19
Wiring Diagrams
Thermostat wiring connections with various units, including dual fuel, zone control, and applications that include the Humidi-
trol
®
Enhanced Dehumidification Accessory (EDA). See figures 18 and 19.
RED
YEL
BLU
BLK
BRN
L7742U
THERMOSTAT
INDOOR
UNIT
OUTDOOR
UNIT
PUR
OUTDOOR
SENSOR
(X2658)
BLK
Y1Y2 JUMPER − IN FOR
SINGLE− STAGE COOLING;
REMOVED FOR 2−STAGE
COOLING
RED
BLK
PUR
EDA UNIT
FAN
RELAY
NOTES −
/1\ NOT REQUIRED FOR APPLICATIONS WITHOUT LSOM
/2\ NOT REQUIRED WITH SINGLE-SPEED OUTDOOR FAN)
/3\ NOT REQUIRED FOR SINGLE STAGE
Figure 18. Typical Condensing Unit/Humiditrol
®
Accessory Wiring Diagram
WHEN 2−STAGE HEAT IS USED, T’STAT IS
CONFIGURED FOR 2−STAGE HEAT, CONNECT 2ND
STAGE HEAT BULB TO TERMINAL W2 & REMOVE
JUMPER BETWEEN R & W2.
CUT ON−BOARD LINK (CLIPPABLE CONNECTION)
FROM DS TO R (W914) WHEN DEHUMIDIFICATION
OR HARMONY CONTROL IS USED.
DO NOT CUT ON−BOARD LINK (CLIPPABLE
CONNECTION) FROM R TO O (W951). IT IS USED
FOR CONDENSING UNIT APPLICATIONS.
REMOVE R TO O JUMPER IN HEAT PUMP
APPLICATIONS.
REMOVE DS TO Y1 JUMPER WHEN
DEHUMIDIFICA TION D TERMINAL IS USED.
OUTDOOR SENSOR FOR OUTDOOR TEMP. DISPLAY,
DEW POINT CONTROL, HEAT PUMP BALANCE
POINTS & DUAL FUEL BALANCE POINTS.
RED WIRE TO OUTDOOR CONDENSING UNIT USED
ONLY FOR UNITS WITH LSOM & FOR ALL HEAT
PUMPS.
BROWN WIRE USED ONLY ON UNITS WITH LSOM.
FOR HUMIDIFIER, 48G95 (OR EQUIVALENT)
ISOLATION RELAY REQUIRED (COIL 24VAC, 5VA
MAX.). CAN BE USED WITH ALL T’STAT
APPLICATIONS.
CUT ON−BOARD LINK (CLIPPABLE CONNECTION)
FROM Y1 TO Y2 (W915) FOR 2−STAGE COOLING.
K183 DEHUMIDIFICATION RELAY KIT (26W62)
REQUIRED WHEN USING D TO DS TERMINALS WITH
CB(X)27 UNITS.
NOTE: NOT ALL UN-
USED TERMINALS ARE
SHOWN ON T’STAT
DIAGRAMS.
DUAL FUEL
FURNACE SETUP
CUT ON−BOARD LINK
(CLIPPABLE CONNECTION)
FROM R TO O (W951).
CUT ON−BOARD LINK
(CLIPPABLE CONNECTION)
FROM R TO DS (W914).
WITH DEFROST
TEMPERING, SET W2 TO
TIMED ON.
Figure 19. Thermostat Wiring Diagrams
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