Lennox ComfortSense L3021H Installation Instructions Manual
3000 series
non-programmable
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Also See for ComfortSense L3021H:
- Operation manual (10 pages) ,
- Installation instructions manual (6 pages)
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E2011 Lennox Industries Inc.
Dallas, Texas, USA
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
L3011C/L3021H Thermostats
The Lennox ComfortSenset 3000 Series non-program-
mable electronic thermostats are easy-to-use, have a
large, easy-to-read display, and provide excellent temper-
ature control. Both thermostat models also includes a pro-
grammable filter change reminder, and a system check in-
dicator which will notify the user of the need for equipment
service.
Thermostat model L3011C is suitable for non-heat pump,
single−stage heat/single−stage cool applications that are
matched with a gas or electric furnace.
Thermostat model L3021H is suitable for single−stage heat
pump applications that are matched with a gas or electric
furnace as the auxiliary heat source. An optional outdoor
temperature sensor provides auxiliary heat lockout/bal-
ance point operation and dual−fuel compatibility.
11/11
*2P1111*
INSTALLATION
INSTRUCTIONS
ComfortSenset 3000 Series
Models L3011C
Non-Programmable
Thermostats
CONTROLS
506080−01
11/11
Supersedes 02/08
Table of Contents
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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.
Shipping and Packing List
1 − Thermostat (L3011C or L3021H)
2 − Plastic wall anchors
2 − Screws
Optional Accessories
Outdoor Sensor (used with L3021H only): X2658
Wall Plate: X2659
*P506080-01*
/
L3021H
Litho U.S.A.
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506080−01
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Summary of Contents for Lennox ComfortSense L3021H
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Page 1: Table Of Contents
......L3011C/L3021H Thermostats General The Lennox ComfortSenset 3000 Series non-program- These instructions are intended as a general guide and do mable electronic thermostats are easy-to-use, have a not supersede local codes in any way. -
Page 2: Requirements
7. Use a small slotted screwdriver to secure all wires to Requirements the subbase terminal block. Make thermostat connec- tions as follows: IMPORTANT L3011C − See table 1 and figure 1. Read all of the information in this manual before using L3021H −... -
Page 3: Thermostat Operation
Table 2. L3021H Terminal Designations Terminal Description Reversing valve, cool active Reversing valve, heat active 24VAC Fan control First-stage cooling/heating, compressor- generated Auxiliary heating, furnace-generated Service Indicator (Wired) 24VAC common Emergency heat Outdoor temperature sensor connection 1 Outdoor temperature sensor connection 2 Figure 2. - Page 4 Table 3. DIP Switch Function Description is set on G, fan operation during the heating mode will be con- trolled by the furnace, rather than by the thermostat. The Desig- Factory thermostat fan icon is not displayed during heating mode op- nation Setting Description...
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Page 5: Wiring Diagrams
Wiring Diagrams Typical wiring diagrams for the thermostats are shown in figure 3 for the L3011C and figure 4 (Page 6) for the L3021H. L3011C AIR HANDLER L3011C AIR HANDLER WITH V" DRIVE NOTE − If the CS3000 is being installed with an icomfort−enabled air handler, refer to the appropriate Air Handler Installation Instructions for thermostat connections. - Page 6 HEAT PUMP AIR HANDLER AIR HANDLER WITH V" DRIVE L3021H L3021H NOTE − If the CS3000 is being installed with an icomfort−enabled air handler, refer to the appropriate Air Handler Installation Instructions for thermostat connections. DUAL FUEL FURNACE FURNACE WITH V" DRIVE L3021H L3021H Figure 4.