Trane IntelliPak I Programming, Troubleshooting Manual page 6

General Information
Evap Diff. Evap Diff is a calculated value indicating performance of a refrigeration
system. It is calculated by determining the difference between the Entering and Leaving
temperatures of the evaporator. If this value rises too high it may indicate a problem
with the system.
External Stop. A binary input on the RTM that allows unit shutdown, with automatic
reset, when connected to a field-supplied switch.
Hot Gas Bypass. A feature to reduce a refrigeration circuit's cooling capacity by
bypassing hot discharge line refrigerant directly to the evaporator coil of the system to
more effectively operate in low load conditions.
Humidification Control. During modes of continuous fan operation a relay is energized
when the Humidity measured in the controlled space drops below an adjustable
Humidification SETPOINT. The humidifier device is a user supplied device placed in the
supply air stream.
LonTalk. An open, device networking communications protocol for controls. This
protocol is defined in ANSI approved standard EIA/CEA-709.1-A-1999.
Low Ambient Compressor Lockout. A function which prevents compressor operation
at low outdoor ambient temperatures.
Night SetBack (NSB). Applies to the control of the rooftop unit during unoccupied
periods. Also refers to the NSB panel, a communicating wall sensor with night setback
capability.
Reference Enthalpy. An outdoor enthalpy value above which economizing will be
disabled.
Remote Human Interface. A human interface module designed to be mounted
remotely from the unit. There are some functional differences between a unit mounted
and a remote mounted human interface module.
Reset Amount Maximum. The maximum amount of reset allowed.
Reset End Temperature. The temperature at which the maximum reset amount will
occur.
Reset Start Temperature. The temperature at which reset will begin.
Return Fan Control. Return Fan Control is a feature which allows units to operate at a
higher external or duct system static pressure, or to reduce the load (horsepower
requirement) on the supply fan motor. The fan is placed in the return air path.
Return Fan Plenum Pressure. The area between the Exhaust and Return Dampers and
the outlet of the Return Fan defines the return plenum. The absolute static pressure
measured in this area is the Return Fan Plenum Pressure.
6 RT-SVP04F-EN