Lennox S40 Installation And Setup Guide

13
Single wire
to indoor unit
terminal “C”.
Unused
wires
Single wire directly to
C terminal or
to third bundle.
.
Indoor Unit Controller
PureAir S Unit
Thermostat
R i+ I- C
Unused
wires
Outdoor Unit
Unused
wires
Figure 13. Unshielded Thermostat Cable (Multiple Conductors) used
for Wiring Communicating Indoor Unit to PureAir S
Dual Fuel and Ventilation Diagrams
For additional wiring, please refer to the accessory installation instruction.
When using a Lennox Communicating Furnace and conventional heat pump
an equipment interface module (EIM) will be require. In addition, ventilation
(ERV/HRV and Fresh Air Damper will also required an EIM. Refer to the
EIM Installation and Setup Guide 507240-0x for detailed wiring diagrams for
specic application.
Installation Considerations
WARNING
Improper installation, adjustment, alteration, ser vice or maintenance can
cause property damage, personal injury or loss of life.
Installation and service must be performed by a li censed professional HVAC
installer (or equivalent) or a service agency.
Before beginning installation, note the type of equipment, number of stages,
and any accessories being installed.
Do
• Read this entire document, noting which procedures pertain to your specic
equipment and system requirements.
• Conform to local and national building and electrical codes and ordinances.
• Place the thermostat on a central interior wall.
• Installed thermostat a minimum of 5 feet up from the oor.
Do Not
• Install on voltages higher than 30VAC.
• Exceed 300 feet (91 meters) total wire length when using 18AWG or 22AWG
thermostat or smaller diameter wire (see “Table 2. Terminal Designations
and Wiring Recommendations” on page 4 for further details.
• Install on outside walls or in direct sunlight
• Install near air return or discharge air vents.
• Install near replaces or other heat sources
• Install on exterior walls
• Install near windows or doors
• Install near kitchens
• Install in rarely used rooms or hallways
Thermostat Installation
Installation
Use the following procedure for installation of the thermostat wall plate where
existing thermostat wiring does not exist:
1. Unpack the thermostat and sub-base.

Lennox S40 Specifications

General

Brand	Lennox
Model	S40
Category	Thermostat
Language	English