Trane IntelliPak Signature Series Programming Manual page 5

Glossary
These terms are used throughout this
manual. Knowledge of these terms is
essential in gaining an understanding of
how these units operate.
Active Setpoint
The setpoint which is currently being
used for control by the setpoint source
selection.
Compressor Lockout
All affected compressors stop and
remain off until the condition resets or is
manually reset.
Compressor Protection Switch
A pressure switch installed on the
suction line that prevents compressor
operation below the switch's setpoint.
The purpose is to prevent no-flow scroll
compressor operation.
Control Band
The range of temperatures or pressures
which would normally be maintained by
the various control functions.
Control Point
The value of a setpoint that an algorithm
is using at any given time.
Deadband
As applied to SA temperature control,
this refers to a range of temperatures
equally spaced above and below the SA
temperature control point in which the
control algorithm is satisfied.
Economizer Zone Temp Setpoint
Suppression
A parameter used for setting the Zone
Temp setpoint at a lower value than the
mechanical cooling zone temperature
setpoint.
External Heat
A heat source external to the self-
contained unit that is field installed. i.e.
duct heat or VAV reheat boxes.
External Stop
A binary input on the RTM that allows
unit shutdown when connected to a field-
supplied switch.
Hydronic Heat
Optional steam or hot water heat coil.
Independent Refrigerant Circuit
All model SCWG/SIWG, SCRG/SIRG and
SCWF/SIWF units have independent
refrigerant circuits.
PKG-SVP01B-EN
Programming
Low Ambient Compressor Lockout
A function which prevents compressor
operation at low outdoor ambient
temperatures.
Low Entering Condenser Water Tem-
perature
When the entering water temperature
sensor reads a water temperature below
the minimum water temperature input
into the controller. 54 F is the factory
preset temperature.
Low Entering Water Temperature
Compressor Lockout
On units with head pressure control
disabled and an entering water tempera-
ture below 54 F , compressor operation
disables. Economizer operation is still
functional.
Manifolded Refrigerant Circuit
Only model SCRF/SIRF units, 30-60 tons,
have manifolded refrigerant circuits.
Night Setback (NSB)
Applies to unit control during unoccupied
periods.
Night Setback (NSB) Panel
The HI panel display uses this term for
NSB zone sensor.
OA Reset
Outdoor Air Reset - Supply Air Tempera-
ture Reset based on Outdoor Air Tem-
perature.
Occupied Zone Low Temperature Limit
Setpoint
The temperature that initiates daytime
warmup.
Purge
A function which causes zone air to purge
and be replaced by outside air.
Reference Enthalpy
An outdoor enthalpy value above which
economizing disables.
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.
General
Information
Reset Start Temperature
The temperature at which reset will
begin.
Space Pressure
The pressure in the building as measured
by the space pressure transducer,
referenced to outside (atmospheric)
pressure.
Supply Air Pressure High Limit
A pressure limit to prevent unit casing
and/or ductwork overpressurization.
Supply Air Pressure
The pressure in inches water column
(IWC) of the supply duct plenum or outlet
as measured by the supply air pressure
transducer, referenced to local outside
(atmospheric) pressure.
Supply Air Tempering
Turning on heat when the supply air
temperature drops below a preset value
usually due to cold outside air being
brought in to provide building ventilation.
Supply Air Temperature Control Point
The revised value of supply air tempera-
ture setpoint after supply air temperature
reset has been applied.
Supply Air Temperature Reset
A function that shifts the SA Temp
Setpoint an amount based on the value of
another parameter—typically Zone Temp
or Outdoor Air Temp. The purpose of this
function is to lower unit capacity to better
meet load requirements.
Water Purge
When the waterside economizer valve
opens to flush out the economizer tubes
to prevent failure due to stagnant water
and sedimentation.
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