JOHNSON CONTROLS
189
SECTION 7 – PARAMETER DESCRIPTIONS AND OPTIONS
FORM 145.05-NOM7
ISSUE DATE: 10/31/2019
7
MENU ITEM
DEFINITION
HW VALVE ACTION
This parameter is programmed through the PROGRAM key. This parameter
controls the output to the hydronic modulating valve. When the parameter is set
to DIRECT the output is 2 volts for off and 10 volts for full capacity. When the
parameter is set to REVERSE the output is 10 volts for off and 2 volts for full
capacity.
MAXIMUM BYPASS
This parameter is programmed through the Setpoints key. It establishes the
maximum allowable position of the bypass damper in a FlexSys unit.
MIXED AIR TEMP
This is the temperature of the air entering the evaporator coil.
MORNING WARM UP
This parameter is programmed through the PROGRAM key. This tells the Pri-
mary Unit Controller if the Morning Warm-up option is available or not. When it
is programmed to Enabled, Morning Warm Up is available to be used. When it is
programmed to Disabled, Morning Warm Up is unavailable.
MORNING WARM UP CMD
This value is found under the Service key and identifies if a morning warm up
command is communicated from a front end BAS control.
MORNING WARM UP MAX TIME
This parameter is programmed through the Setpoints key. This value is the
maximum time the Primary Unit Controller allows for Morning Warm Up when
the unit is in the Adaptive Morning Warm Up mode. If the derived Morning Warm
Up Opt Time exceeds this time, the Morning Warm Up Max Time is used.
MORNING WARM UP OPT TIME
This is a derived value and is the average of the previous three days Warm Up
times plus 10 minutes. This value is used to determine the Morning Warm Up
start time for the next day when the unit is in the Adaptive Morning Warm Up
mode.
MX SUPPLY AIR TEMP CURRENT
This is the actual temperature of the supply air supplied by the unit configured
for FlexSys operation.
MX SUPPLY AIR TEMP SETPOINT
This parameter is programmed through the Setpoints key. This becomes the
Active Supply Air Temperature Setpoint for a FlexSys unit when it is in the Oc-
cupied Cooling Without Bypass mode.
NIGHT SET BACK
This parameter is programmed through the PROGRAM key. This parameter
allows the user to enable or disable Night Set Back. If this parameter is disabled
Unoccupied Heating is not available. The two parameters to choose from are
User Enabled or User Disabled.
OA DAMPER MAXIMUM POSITION
This parameter is programmed through the Setpoints key. This establishes the
maximum amount of ventilation air to be used.
OA DAMPER MINIMUM POSITION
This parameter is programmed through the Setpoints key. This establishes the
minimum amount of ventilation air to be used when the unit is in the Occupied
mode.
OA DAMPER POSITION ACTIVE
SETPOINT
This is a derived value and is the damper position setpoint, in percent open, the
Primary Unit Controller is trying to maintain.
OA DAMPER POSITION CURRENT
This is a derived value and is the actual output, in percent open to the outdoor
air damper.
OAT FOR SAT HIGH SAT
This parameter is programmed through the Setpoints key. When the outdoor
temperature is equal to or less than this temperature the Active Supply Air Tem-
perature Setpoint on a Variable Air Volume Unit is set to the SAT High Setpoint.
OAT FOR SAT LOW SAT
This parameter is programmed through the Setpoints key. When the outdoor
temperature is equal to or greater than this temperature the Active Supply
Air Temperature Setpoint on a Variable Air Volume Unit is set to the SAT Low
Setpoint.
OCCUPANCY COMMAND
This value is found under the Service key and identifies if a occupancy com
-
mand is communicated from a front end BAS control.
TABLE 43 -
DEFINITIONS (CONT'D)
