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05/09
506228−01
*2P0509*
*P506228-01*
E
2009 Lennox Industries Inc.
Dallas, Texas, USA
Shipping and Packing List
1 −
ComfortSense
®
Model L7742U touch screen, 7−day program-
mable thermostat
2 − Mounting screws (M3.5x25mm self−tapping screws)
2 −
Wall Anchors
1 each − Installation Quick-Start Guide, Programming & Application
Guide, Homeowner’s Manual, Warranty card, Warranty Audit tag
PROGRAMMING AND
APPLICATION GUIDE
ComfortSense
®
7000 Series
Model L7742U Touch Screen Programmable Thermostat
CONTROLS
506228−01
05/09
Supersedes 04/09
IMPORTANT
Read this manual before programming the thermostat.
Use this thermostat only as described in this manual.
IMPORTANT
In all applications, the ComfortSense
®
Model L7742U thermo-
stat can only be used with all residential units and approved
commercial split-system matches, and those which meet the
following installation criteria:
S
installation uses 18 GAUGE thermostat wire or larger,
S
thermostat wire run length DOES NOT EXCEED 300’ (91m),
S
load from any thermostat connection is 1 AMP or LESS.
If used with Harmony II
®
Zone Control System, consult Applica-
tion Note H−04−5.
Litho U.S.A.