icomfortt Technical Description

The 24VAC icomfortt thermostat stores system parameters and set- tings in a nonvolatile memory (i.e., it retains data when electrical power fails or is turned off). The thermostat (see figure 1) also:

Sincludes on-board help screens,

Ssupports heat pumps or non−heat pump units, with up to 4 stage heat / 2 stage compressor operation. (2 stages of heat pump heat- ing and 2 stages of auxiliary backup heat are provided. Also, 2 stages of emergency heat are provided),

Ssupports Indoor Air Quality with time-based notification of consum- ables including media filters, UVC bulbs, humidifier pads, and PureAirt catalyst service / replacement,

Ssupports variable capacity / multistage heat/cool, universal com- patibility (gas/electric/heat pump/ac), and is dual fuel capable with two balance points.

Important

Always use correct software version as recommended for replacement configuration (discovery).

Connections to non communication outdoor units and all accessories is described in the Quick−Start Installation guide. (Wiring diagrams are also shown beginning on Page 36.)

Thermostat connections

R I+ I − C

 

 

 

 

 

 

 

 

 

 

 

RSBUS

 

 

 

 

Maximum total length

Minimum wire size is

 

 

 

 

of all connections on

 

 

 

 

the RSBus is limited

18 gauge

 

 

 

 

 

 

 

 

to 1500ft.

 

 

 

 

 

 

 

 

 

icomfortt Outdoor Units Control icomfortt Furnace Control icomfortt Air Handler Control

External Sensors − outdoor temperature and humidity Humidify control

Dehumidify control

Figure 1. icomfort thermostat system

506052−01 11/09

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Lennox International Inc 2P1109, P506052-01 setup guide Icomfortt Technical Description, + I − C