LENNOX L40 Smart Thermostat Owner’s Manual

1

2

NOTES  

1. See Air Handler Unit Installation  

Instructions for the Lennox L40  

Thermostat wiring.  

Single Stage Furnace and Single Stage Air Conditioner  

Single Stage Air Handler and Single Stage Air Conditioner  

2. Optional normally closed (NC)  

Condensate Float Switch  

L40 Smart Thermostat  

L40 Smart Thermostat  

3. Thermostat / Outdoor Unit Terminal  

Block (BLACK)  

4. Indoor Unit Terminal Block (BLUE)  

W

C

W

C

W1  

W2  

W

5. When wired with heat pump  

applications, a Defrost Tempering Kit  

(67M41) must be installed.  

G

O/B  

R

G

6. ACC2 terminal is set at the factory for  

R

R

G

Y

dehumidifier.  

Black  

C

O

R

7. Cut on-board clippable link from R to O  

G

for heat pump applications only.  

Yellow  

Y1  

8. Install field-provided jumper between Y2  

OUT BL on heat pump to Y2 on indoor  

unit.  

Y

DS  

9. Defrost Temper Kit (67M41).  

O/B  

Black  

C

10. Condensate Overflow Switch  

C

Y

C

Typical Single Stage  

Furnace  

Lennox Typical Non- Low GWP  

Y1  

Yellow  

Y1  

Y2  

Single Stage Air Condiꢀoning Unit  

Lennox Typical Non- Low GWP  

Single Stage Air Condiꢀoning Unit  

Typical Single Stage  

AHU  

Single Stage Air Handler and Single Stage Heat Pump  

Single Stage Furnace and Single Stage Dual Fuel Heat Pump  

Single Stage Furnace and Single Stage Air Conditioner with  

Refrigerant Detection System (RDS)  

2

OPTIONAL  

L40 Smart Thermostat  

N.C. CONDENSATE  

FLOAT WITCH  

L40 Smart Thermostat  

RDS Sensor  

W1  

W2  

W1  

W

L40 Smart Thermostat  

4

3

SW2 SENSOR #1 SENSOR #2  

W1  

W

C

W

W1  

W2  

G

W

G

W1  

W2  

G

W

G

O/B  

R

G

C

R

G

Y

C

R

ON  

O

R

O

R

G

LED  

SW1  

O/B  

O/B  

R

R

G

Y

O/B  

R

R

R

DS  

DS  

C

DS  

C

RDS Field Kit – 24 Volt  

Cat # (27A02)  

C

Y

C

C

C

Y

C

Y

Y1  

Y1  

Y2  

Y1  

Y2  

Y1  

Y1  

Y2  

O/B  

O

TSTAT  

INDOOR  

Typical Single Stage  

Furnace  

Lennox Typical Non- Low GWP  

Single Stage Heat Pump Unit  

Typical Single Stage  

Furnace  

ZONING  

NO COM NC  

ALARM  

NO COM NC  

Typical Single Stage  

AHU  

1

Lennox Typical Non- Low GWP  

Single Stage Heat Pump Unit  

Black  

C

Yellow  

Y1  

Lennox Typical Non- Low GWP  

Single Stage Air Condiꢀoning Unit  

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General	Details
Name	LENNOX L40 Smart Thermostat Owner’s Manual
Make	Lennox
Language	English
Filetype	PDF (Download)
File size	0.17 MB

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• ALL THERMOSTAT INSTRUCTIONS & USER MANUALS
• Lennox

LENNOX L40 Smart Thermostat Owner’s Manual Overview

Summary of Contents

• Page 1: See air handler unit installation instructions for the Lennox L40 thermostat wiring. When wired with heat pump applications, a defrost tempering kit must be installed. ACC2 terminal is set at the factory for dehumidifier. Install field-provided jumper between Y2 OUT BL on heat pump to Y2 on indoor unit. Cut on-board clippable link from R to O for heat pump applications only. Condensate overflow switch is included. Typical single stage furnace and single stage air conditioning unit configurations are provided. L40 smart thermostat options are available. Optional normally closed condensate float switch can be used. RDS sensor is part of the system setup.
• Page 2: Single stage air handler or single stage heat pump with refrigerant detection system (RDS) Single stage furnace or single stage heat pump (dual fuel) with refrigerant detection system (RDS) Optional N.C. condensate float switch RDS sensor L40 smart thermostat RDS field kit – 24 volt Defrost tempering kit Typical single stage AHU Typical single stage furnace Lennox typical non-low GWP single stage heat pump unit