JOHNSON CONTROLS
188
FORM 145.05-NOM7
ISSUE DATE: 10/31/2019
SECTION 7 – PARAMETER DESCRIPTIONS AND OPTIONS
MENU ITEM
DEFINITION
FAN SPEED SETP FOR HIGH SAT
This parameter is programmed through the Setpoints key. When the supply
fan speed is equal to or less than this value the Active Supply Air Temperature
Setpoint on a Variable Air Volume Unit is set to the SAT Set High Setpoint.
FAN SPEED SETP FOR LOW SAT
This parameter is programmed through the Setpoints key. When the supply fan
speed is equal to or greater than this value the Active Supply Air Temperature
Setpoint on a Variable Air Volume Unit is set to the SAT Set Low Setpoint.
FILTER STATUS
This is a derived value and is status of the unit filters. A differential pressure
switch must be installed to measure the pressure drop across the filters. When
the filters are dirty the switch closes sending a binary signal to the Primary Unit
Controller. The User Interface display shows Okay or Change.
FLEX EVAP TEMP ACTIVE SP
This is a derived value and is the active evaporator temperature setpoint that the
Primary Unit Controller is trying to control to. This value is used when a FlexSys
unit is in the Occupied Cooling With Bypass mode.
FLEX EVAP TEMP CURRENT
This is the actual air temperature leaving the evaporator coil of a FlexSys unit.
FLUSH CYCLE
This allows the economizer coil to go through a flush cycle one time a day dur
-
ing an unoccupied period in order to minimize contamination and dirt buildup in
the economizer water coil.
FLUSH DELAY TIME
This is the amount of time between when the controller determines it is time to
initiate a flush cycle and the actual start of the cycle.
ISOLATION DAMPER
This is a binary output that closes a dry set of contact that could be used to initi-
ate isolation damper on the unit's duct work. This same connection is used for a
PUMP START command programmed through the User Interface on the unit by
disabling this function, but they cannot be used together for the same unit.
HEAT LIMIT TEMPERATURE
This parameter is programmed through the Setpoints key. This value determines
the maximum allowable supply air temperature when heating is installed. If the
temperature goes above this setting the heat section is shut down.
HEATING CONTROL OFFSET
This is a derived value and is the control band the unit is trying to maintain. The
control band is the Active Setpoint plus or minus the Heating Control Offset. If
the temperature is below this band additional heating is required, if the tempera-
ture is above this band heating is decreased.
HEATING SAT
This parameter is programmed through the Setpoints key. On a VAV or FlexSys
unit this becomes the Active Supply Air Temperature Setpoint for heating opera-
tion. The Primary Unit Controller controls the heating option to try and maintain
this temperature.
HEATING SYS STATUS
This is the current operating mode of the Heating Section. The display shows
Normal - Active, Normal - Inactive, Safety Trip, Safety Fault, Safety Lockout,
Under Floor Control, User Disabled, or None.
HEATING SYSTEM
This parameter is set through the PROGRAM key and is used to turn the heat-
ing function on or off. The options are User Enabled or User Disabled.
HEATING SYSTEM TYPE
This parameter is programmed through the Options key. This parameter is used
to identify the type of heat installed in the unit. The options are None, Electric
Heat, Hot Water Heat, or Steam Heat.
HIGH DUCT STATIC SW
This parameter is programmed through the OPTIONS key. This is used to
identify if a high duct static switch is installed. The options are Not Installed or
Installed
HW / STEAM HEAT - FREEZESTAT
This is a derived value and identifies the status of the hydronic heat freezestat.
This is done through a binary input to the Primary Unit Controller. The switch is
closed for normal operation and opens on failure. The User Interface indicates
OK or TRIPPED.
HW / STEAM HEAT - VALVE POS
This is a derived value and identifies the output from the Primary Unit Controller
to the hydronic valve as percent open.
TABLE 43 -
DEFINITIONS (CONT'D)
