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E2017 Lennox Industries Inc.
Dallas, Texas, USA
THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER
FOR FUTURE REFERENCE
WARNING
This product contains a chemical known to the State of
California to cause cancer, birth defects, or other
reproductive harm.
WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause personal injury, loss of life, or
damage to property.
Installation and service must be performed by a licensed
professional installer (or equivalent) or a service agency.
L3011C/L3021H Thermostats
These are non-programmable electronic thermostats
which are easy-to-use, have a large, easy-to-read display,
and provide excellent temperature control. Both thermo
stat models also includes a programmable filter change re
minder, and a system check indicator which will notify the
user of the need for equipment service.
INSTALLATION
INSTRUCTIONS
ComfortSense
Models L3011C
Non-Programmable
Thermostats
CONTROLS
506080-02
5/2017
Supersedes 506080-01
Table of Contents
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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.
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
®
3000 Series
/
L3021H
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Summary of Contents for Lennox L3011C
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Page 1: Table Of Contents
......FOR FUTURE REFERENCE Thermostat model L3011C is suitable for non‐heat pump, WARNING single-stage heat/single-stage cool applications that are matched with a gas or electric furnace. -
Page 2: Requirements
Read all of the information in this manual before using this thermostat. L3011C - See table 1 and figure 1. L3021H - See table 2 and figure 2. All wiring must conform to local and national building 8. -
Page 3: Thermostat Operation
93°F for about 30 minutes. DIP Switch Settings DIP Switch Settings L3011C and L3021H thermostats include five DIP switches located on the back side of the thermostat body. These switches may be used to re-calibrate the thermostat (Wired) (Cal 1, Cal 2 and Cal±) and to select the thermostat display... - Page 4 The Cal 1, Cal 2 and Cal± DIP switches may be used to offset or recalibrate the room temperature display. Table 4 -1°F provides DIP switch settings and corresponding tempera -2°F ture offset values. -3°F L3011C Thermostats Only - If the fan operation DIP switch 506080-02 5/2017 Page 4...
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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 L3011C COIL BLOWER COIL BLOWER WITH “V” DRIVE L3011C L3011C FURNACE FURNACE WITH “V” DRIVE Figure 3. - Page 6 HEAT PUMP COIL BLOWER COIL BLOWER WITH “V” DRIVE L3021H L3021H DUAL FUEL FURNACE FURNACE WITH “V” DRIVE L3021H L3021H Figure 4. Typical Wiring Diagrams for Heat Pump or Dual Fuel with L3021H Thermostat 506080-02 5/2017 Page 6...