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Installation Instructions Manual

Lennox ComfortSense L3021H, Installation Instructions Manual

The Lennox ComfortSense L3021H is a highly efficient and reliable thermostat for your home. With its user-friendly interface and advanced features, it ensures optimum comfort and energy savings. To get started, simply visit manualshive.com to download the free Installation Instructions Manual, providing you with easy-to-follow guidance for a hassle-free setup.

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Page 6

506080-02 5/2017

HEAT PUMP

DUAL FUEL

FURNACE WITH “V” DRIVE

COIL BLOWER

COIL BLOWER WITH “V” DRIVE

FURNACE

L3021H

L3021H

L3021H

L3021H

Figure 4. Typical Wiring Diagrams for Heat Pump or Dual Fuel with L3021H Thermostat

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Summary of Contents for ComfortSense L3021H

Page 1: ...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 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 Th...

Page 2: ...re flush with the wall 6 Align the subbase over the plastic anchors and secure it to the wall using the provided screws 7 Use a small slotted screwdriver to secure all wires to the subbase terminal block Make thermostat connec tions as follows D L3011C See table 1 and figure 1 D L3021H See table 2 and figure 2 8 Thermostat L3021H Only D For most applications E will be jumpered to W1 If separate wi...

Page 3: ...as 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 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 thermost...

Page 4: ...G fan operation during the heating mode will be controlled by the furnace rather than by the thermostat The thermostat fan icon is not displayed during heating mode op eration even though the fan may be energized This setting is used in applications which include a gas furnace If the fan operation DIP switch is set on E the thermostat controls fan operation during the heating mode This setting is ...

Page 5: ... diagrams for the thermostats are shown in figure 3 for the L3011C and figure 4 Page 6 for the L3021H COIL BLOWER WITH V DRIVE COIL BLOWER FURNACE WITH V DRIVE FURNACE L3011C L3011C L3011C L3011C Figure 3 Typical Wiring Diagrams for Condenser and L3011C Thermostat ...

Page 6: ...6080 02 5 2017 HEAT PUMP DUAL FUEL FURNACE WITH V DRIVE COIL BLOWER COIL BLOWER WITH V DRIVE FURNACE L3021H L3021H L3021H L3021H Figure 4 Typical Wiring Diagrams for Heat Pump or Dual Fuel with L3021H Thermostat ...

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