icomfort
Touch Screen 7−Day Programmable Thermostat
Page 3
icomfort
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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
