Dual Fuel And Ventilation Diagrams; Installation Considerations; Thermostat Installation; Installation - Lennox S40 Installation And Setup Manual

Outdoor Unit
Unused
wires
PureAir S 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
Indoor Unit Controller
Unused
wires
Single wire directly to
C terminal or
to third bundle.
.
EIM Installation and Setup Guide 507240-0x for detailed wiring diagrams for
specific application.

Installation Considerations

Improper installation, adjustment, alteration, ser vice or maintenance can
cause property damage, personal injury or loss of life.
Single wire
to indoor unit
Installation and service must be performed by a li censed professional HVAC
terminal "C".
installer (or equivalent) or a service agency.
Before beginning installation, note the type of equipment, number of stages,
and any accessories being installed.
Do
Thermostat
• Read this entire document, noting which procedures pertain to your specific
R i+ I- 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 floor.
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 fireplaces 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.
13
WARNING