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icomfort Wi-Fit 7−Day Programmable Communicating Thermostat
Page 3
icomfort Wi-Fit Thermostat − Technical Description and Features
The 24VAC icomfort Wi-Fit thermostat (figure 1) is an electronic communi-
cating, color display touchscreen, 7−day programmable thermostat. It stores
system parameters and settings in nonvolatile memory (i.e., it retains data
when electrical power fails or is turned off). It is designed for 4−wire connec-
tion to other communication devices as listed in figure 1.
The icomfort Wi-Fit thermostat can connect to online services via the inter-
net through the homeowner’s Wi−Fi access point. After online registration is
completed, the system may then be accessed by the homeowner from any-
where using a remote internet connection via computer or personal commu-
nicating device.
Thermostat
connections
RSBus
Minimum wire
size is 18 gauge
icomfortt−enabled Furnace Control
icomfortt−enabled Air Handler Control
icomfortt−enabled Outdoor Unit Control
External Sensors − outdoor temperature, discharge air
Humidify Control
Dehumidify Control
R i+ i− C
Maximum total length of all
connections on the RSBus is
limited to 1500 ft. (450 m).
Max. length between compo-
nents is 300 ft. (90 m).
Note: icomfort
Wi-Fit thermo-
stat does not
require
shielded cable
wiring.
RED
GREEN
WHITE
YELLOW
Figure 1. icomfort by Lennoxt system
BEST PRACTICES! Keep all communication wiring as far away from house
electrical wiring and large electrical appliances as possible (15’ [5m] recom-
mended).
The thermostat also:
S supports three languages (English, French, Spanish),
S supports air conditioning units or heat pump units with up to four stages
of heat / two stages of compressor operation (2 stages of heat pump
heating, 2 stages of auxiliary back−up heating, 2 stages of emergency
heating),
S supports Indoor Air Quality with time-based notification of consum-
ables including media filters, UVC bulbs, humidifier pads, and Pure-
Airt system catalyst service / replacement,
S supports variable−capacity / multi−stage heat/cool, universal compati-
bility (gas/electric/heat pump/ac), and is dual fuel capable (icomfort−
enabled HP only) with two balance points.
Important
Connections to non−communicating outdoor units and accessories are de-
scribed in the Quick−Start Installation guide. (Wiring diagrams are also
shown beginning on Page 59 of this manual.)
Supports
S Humidification Measurement and Control,
S Dew Point Adjustment Control
S Dehumidification Measurement and Control
S Humiditrol
®
Enhanced Dehumidification Accessory (EDA)
S Multi-Stage HVAC Systems
S Equipment Maintenance Reminders
S Autochangeover Mode −− Permits control of heating, cooling, humidifi-
cation, and dehumidification without user involvement.
Outdoor Temperature Sensor (option)
Communicating outdoor units contain a built−in outdoor temperature sensor.