Lennox 10T50 User Manual

5
Installation
IMPORTANT
The Lennox communicating thermostat paired with the Equipment
Interface Module (EIM) will work with most 24VAC furnaces, air handlers,
air conditioners and heat pumps (up to 2-stages of cooling and 3-stages
of heat).
The Lennox communicating thermostat without the Equipment Interface
Module (EIM) will work with Lennox communicating HVAC equipment.
1. Remove the module cover.
2. Mount the Equipment Interface Module (EIM) near the indoor unit.
3. Use the wiring diagrams reference in the sectoin titled “Field Wiring”
on page 11 to complete the wiring connections for the specic
application and conguration.
Conguration Setup
How the EIM is congured is determined by the system components.
NOTE: Changing jumper positions after the control has been powered-up
requires recommissioning for the change to be recognized.
NOTE: When the Equipment Interface Module is replaced, recommissioning
the Lennox communicating thermostat will also need to be re-
accomplished. See the Lennox communicating thermostat Setup
Guide for recommissioning procedure.
The following examples are two typical congurations used with the EIM.
There are other applications as well and are address in the wiring diagrams
section titled “Field Wiring” on page 11. Those diagrams will indicate all
required jumper settings on the EIM and wiring connections.
EIM, 24VAC Furnace and Lennox Communicating Heat Pumps
See “Figure 13. Dual-Fuel - Conventional Furnace with Lennox Communicating
Heat Pump” on page 12 for wiring details.
1. Set the EIM Unit Type Jumper to IFC.
2. Set the EIM Heat Stage Jumper (see “Table 3. Heat Stage Jumpers” on
page 6) to the applicable number of furnace heat stages or number
of electric heat stages.
3. Use the Lennox communicating thermostat to complete the
commissioning procedure.
EIM, Lennox Communicating Furnace and 24VAC Heat Pump
See “Figure 12. Dual-Fuel - Lennox Communicating Furnace with
Conventional Heat Pump” on page 12f or wiring details.
1. Set the EIM Unit Type Jumper to Heat Pump.
2. Set the EIM Heat Stage Jumper (see “Table 3. Heat Stage Jumpers”
on page 6) to the applicable number of heat pump heating stages.
3. Use the Lennox communicating thermostat to complete the
commissioning procedure.
NOTE: For two-stage heat pump go to the heat pump defrost control,
locate P3 - low ambient thermostat pins and disable this function
by removing the installed jumper and relocating it to one pin only.
Unit Type Jumpers
Set the unit type jumper for the type of indoor unit being by using the
following table and gure. The factory default setting is IFC. If jumper is
missing from the jumper pins, then alarm 130 is activated.
Table 2. Unit Type Jumpers Positions
Jumper
Position
Indoor Unit Outdoor Unit
HP
Lennox Communicating Fur-
nace
Conventional Heat Pump
IFC Conventional Furnace
Conventional Heat Pump or air
conditioner
AHC Conventional Air Handler
HP IFC AHC
Figure 3. Unit Type Jumper Positions

Lennox 10T50 Specifications

General

Brand	Lennox
Model	10T50
Category	Recording Equipment
Language	English