York J Series Manual page 56

Parameter Descriptions and Options
FlexSys Dewpt Reset
The FlexSys Dewpt Reset will tell the control that a
FlexSys Under-Floor Humidity (FLEXRH) and Under-
Floor Slab Temperature sensors are present and enabled
for use. This setting will allow Evaporator Discharge
Air Temperature Reset.
If this setting is enabled, both the FlexSys Under-Floor
Humidity (FLEXRH) and Under-Floor Slab Tempera-
ture sensors must be installed and reliable or faults shall
be generated. If this setting is disabled, alarms will not
be generated for these two sensors and active faults
will be cleared.
Exh Dmpr Pos For ON
This tells the control the Exhaust Air Damper position
at which to turn ON the Exhaust Fan for building pres-
sure control using a modulated exhaust air damper or
VFD.
Exh Dmpr Pos For OFF
This tells the control the Exhaust Air Damper position
at which to turn OFF the Exhaust Fan for building
pressure control using a modulated exhaust air damper
or VFD.
OA Dmpr Pos For ON
This tells the control the Economizer Air Damper
(outdoor air damper) position at which to turn ON the
Exhaust Fan.
OA Dmpr Pos For OFF
This tells the control the Economizer Damper (outdoor
air damper) position at which to turn OFF the Exhaust
Fan.
OAH Sensor Enable
This tells the control that an outside air humidity (OAH)
sensor is present and enabled for use.
The enthalpy control function will be self-configuring
to make use of the available sensors to calculate the best
available decision strategy for free cooling availability.
For example, if it detects that OAT and OAH and RAT
and RAH sensors are all connected and reliable, it will
self-configure for differential enthalpy operation. If one
of the return air sensors should fail, the control will
reconfigure for outside enthalpy operation, etc. When
available and reliable, the RAT, RAH, and OAH sen-
sors will be used for enthalpy control whether or not
they are enabled.
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Should a sensor fault be detected for the OAH sensor,
the fault is displayed and recorded only if the OAH
Sensor Enable is ON.
If the controller is networked, the network can be pro-
grammed to share the OAT and OAH sensed values with
other controllers connected to the network or to receive
these values from the network.
RAH Sensor Enable
This tells the control that a return air humidity (OAH)
sensor is present and enabled for use.
The control will self-configure for enthalpy control
based on the sensor availability as described above in
above in Outside Air Humidity Sensor Enable (OAH
Sensor Enable).
Should a sensor fault be detected for the RAH sensor,
the fault is displayed and recorded only if the RAH
Sensor Enable is ON.
Exhaust Cntrl Offset
This setting tells the control what the control band is for
the building pressure control. This setting is a plus or
minus value to be added or subtracted to the Building
Pressure Setpoint. For the proportional exhaust systems,
this setting is the proportional band for the control loop.
For the on/off exhaust system, this setting establishes the
turn ON and turn OFF points for the exhaust fan.
Economizer Enable
This setting tells the control to allow Economizer Op-
eration to occur. If this setting is set to ON, the control
will operate the economizer normally. If this setting is
set to NO, the control will not operate the economizer,
even if the unit is equipped with economizer hardware.
However, all ventilation options will be operated nor-
mally, regardless of this setting.
SAT Econo Loading
This tells the control that it is to use Economizer
Loading to control excessive SAT when economizer
operation is calculated to be not available.
Power Exhaust Enable
This tells the control to enable or disable the power
exhaust system. If the unit is configured with no Power
Exhaust (See Power Exhaust Configuration), the setting
will be ignored.
FORM 100.50-NOM7 (808)
JOHNSON CONTROLS