icomfortt Thermostat Terms and Acronyms

Subnet Controller (SC): (part of the communicating thermostat) Local device that controls the system.

Subnet: A part of the communication network that contains devices to control one functional HVAC system.

RSBus − Residential Serial Bus − the means for transmitting data within the communicating system.

Controller Area Network Protocol: Rules for networking, for transmis- sion and receipt of information between communicating systems.

Baud Rate: Maximum speed of BUS 40K baud.

Byte: 8 bits of information transmitted on the RSBus.

Integrated Furnace Control (IFC): Communicating control for furnace. IFC controls ignition, CAI, blower, and monitors all safety features in the unit.

Air Handler Control (AHC): Communicating control for air handler units. AHC controls operation of blower, heat strips, and monitors all safety features in the unit.

HP Control (Defrost Control) (UC): Communicating defrost control. UC controls low and high speed compressor operation, defrost opera-

tions, fan motor, and reversing valve and monitors all safety features in the unit.

AC Control: Communicating air conditioning control. AC controls low and high speed compressor operation, fan motor operation, and all safe- ty monitors in the unit.

Discharge Air Sensor (DAS): Communicating discharge air sensor. Provides discharge air temperature to Bus, UI, and IFC for proper opera- tion of equipment.

R:24V power

C:24V common

i+: + data information connection

i−: − data information connection

Configuration: Function that accrues during setup of system to identify other communicating devices. Configuration is also used in setup of a variable capacity furnace to properly set furnace parameters.

Memory Fault Recall: Method of checking for errors

Firmware: Software stored on a memory chip instead of being part of a program

Software: Programming and applications for computer

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icomfortt Touch Screen 7−Day Programmable Thermostat

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Lennox International Inc P506052-01, 2P1109 setup guide Icomfortt Thermostat Terms and Acronyms