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E2008 Lennox Industries Inc.
Dallas, Texas, USA
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
L3511C/L3522C/L3532H 5/2 Day
Programmable Thermostats
The Lennox ComfortSenset 3000 Series 5/2 day pro-
grammable electronic thermostats provide excellent tem-
perature control and have a large, easy to read display.
Also provided is a programmable filter−change reminder,
an equipment maintenance reminder, and a system check
indicator. The system check indicator will notify the user
when the equipment requires service.
Thermostat model L3511C is suitable for non-heat pump,
single stage heat/single stage cool applications using a
gas or electric furnace.
Thermostat model L3522C is suitable for non-heat pump,
two-stage heat/two-stage cool applications using a gas or
electric furnace.
Thermostat model L3532H is suitable for heat pump,
three-stage heat/two-stage cool applications using a gas
or electric auxiliary heat source. An optional outdoor tem-
perature sensor provides auxiliary heat lockout, balance
point operation, and dual−fuel compatibility.
General
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
having jurisdiction before installation.
Check equipment for shipping damage. If you find any
damage, immediately contact the last carrier.
02/08
*2P0208*
INSTALLATION
INSTRUCTIONS
ComfortSenset 3000 Series
Models L3511C
5/2 Day Programmable
Thermostats
CONTROLS
506077−01
02/08
505,051M
Supersedes
Table of Contents
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Shipping and Packing List
Shipped With Product
1 − Thermostat (L3511C, L3522C, or L3532H)
2 − Plastic Wall Anchors
2 − Screws
Optional Accessories
Outdoor Sensor (Used with L3532H only): X2658
Wall Plate: X2659
Requirements
IMPORTANT
Read all of the information in this manual before using
this thermostat.
All wiring must conform to local and national building
and electrical codes and ordinances.
This is a 24VAC low−voltage thermostat. Do not install
on voltages higher than 30VAC.
Be sure that power routed to the thermostat has been pow-
ered off before beginning installation.
This thermostat should be used only as described in this
manual.
Do not install the thermostat on outside walls (where there is
unconditioned space on opposite side of wall) or in locations
where direct sunlight may be present.
Install thermostat about 5 feet up from the floor.
*P506077-01*
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L3522C
L3532H
Litho U.S.A.
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506077−01
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Summary of Contents for Lennox ComfortSense L3511C
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Page 1: Table Of Contents
Shipping and Packing List Programmable Thermostats Shipped With Product 1 − Thermostat (L3511C, L3522C, or L3532H) The Lennox ComfortSenset 3000 Series 5/2 day pro- 2 − Plastic Wall Anchors grammable electronic thermostats provide excellent tem- 2 − Screws perature control and have a large, easy to read display. -
Page 2: Installation
Removing Thermostat CAUTION The thermostat hinges on tabs on the top of the subbase. After installation is complete, no tool is needed to remove Do not short (jumper) across terminals on the gas the thermostat from the subbase. Pivot the bottom of the- valve or at the system control to test installation. -
Page 3: Thermostat Operation
Thermostat Operation NOTE: The thermostat heating mode will not operate if the thermostat has been stored or is being used at ambient temperatures that are above 93°F. The heating function will be enabled after the thermostat is exposed to ambient temperatures below 93°F for about 30 minutes. - Page 4 L3511C & L3522C Thermostats Only − If the fan option Table 5. DIP Switch Temperature Offset DIP switch is set on G, fan operation during the heating mode Cal 1 Cal 2 Cal +/− Temperature Offset will be controlled by the furnace, rather than the thermostat. +0°F (no offset) The thermostat fan icon is not displayed during heating mode operation, even though the fan may be energized.
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Page 5: Wiring Diagrams
Wiring Diagrams L3511C COIL BLOWER L3522C COIL BLOWER L3511C COIL BLOWER WITH V" DRIVE L3522C COIL BLOWER WITH V" DRIVE L3522C FURNACE L3511C FURNACE L3511C FURNACE WITH V" DRIVE L3522C FURNACE WITH V" DRIVE Figure 4. Typical Wiring for Condenser & Figure 5. - Page 6 HEAT PUMP L3532H L3532H COIL BLOWER COIL BLOWER WITH V" DRIVE DUAL FUEL L3532H L3532H FURNACE FURNACE WITH V" DRIVE Figure 6. Typical Wiring for Heat Pump, Dual Fuel & L3532H Thermostat 506077−01 02/08 Page 6...