York J Series Manual page 55

Rev Act Heat Valve
When this option is set to ON, the control outputs
10VDC when the valve is closed and 0VDC when the
valve is open. The valve operation is opposite of the
Direct Actuated valve and is intended for Normally
Open ("fail-safe") valves.
Cooling Mode Enable
When the Cooling Mode Enable parameter is ON,
the unit is to use CV or VAV Cooling Operation to
control temperature. When this parameter is OFF, no
mechanical cooling will be used.
Heating Mode Enable
When the Heating Mode Enable parameter is ON, the
unit is to use CV or VAV Heating Operation to control
temperature. When this parameter is OFF, no heating
will be used.
Heating Lockout OAT
This is the Outside Air Temperature Setpoint that the
control will use to lock out Heating when the OAT is
above this setpoint. A one-degree hysteresis is to be used
on each side of the setpoint.
Cooling Lockout OAT
This is the Outside Air Temperature Setpoint that the
control will use to lock out Cooling when the OAT is
below this setpoint. A one-degree hysteresis is to be
used on each side of the setpoint.
Cooling SAT Alarm
The SAT must be below this setpoint when all stages
of compression are operating and after 60 minutes has
elapsed since the last compressor was energized. If this
does not happen, the control will declare a Cooling SAT
Failure Alarm. Disabled if Setpoint = 0°.
Heating SAT Alarm
The SAT must be above this setpoint when all steps
of heating are operating and after 20 minutes have
elapsed since the last heating step was energized. If
this does not happen the control declare a Heating SAT
Failure Alarm.
Duct Pressure Limit
This parameter is applicable only to VAV mode of
operation and controls at what static pressure to shut
down the unit if this setpoint is reached. This setpoint
JOHNSON CONTROLS
is to insure that Supply Fan does not operate with a
problem that could cause ductwork damage. When the
static pressure reaches this setpoint:
• The control will drive the Supply Fan control output
to zero.
• If there is no change in static pressure after 20 sec-
onds, the control will generate a High Duct Static
fault and shut down the unit.
VAV Occupied Heat
This unit setup selection tells the control to allow VAV
Occupied Heating to occur if necessary. When this setting
is set to ON, full heating will be energized when either:
• The thermostat W1 or W2 signal is received, or
• The space temperature falls below the VAV Setpoint
for SAT Reset by more than 2°F.
OA SAT Reset
This setting will tell the control to reset the SAT setpoint
on VAV units based on the Outside Air temperature in-
stead of Space temperature. Outside Air SAT reset will
only be allowed when the setting VAV Operation With
Thermostat is set to OFF. This function can be used for
Space Sensor and Stand Alone operation.
SAT Temper Enable
When SAT Tempering Enable is ON, the control will use
tempering to increase the no demand stability of heating
or cooling. SAT Tempering must be available for SAT
Tempering to function. This configuration setting will
be ignored if SAT Tempering is not available.
VAV With Thermostat
This parameter is applicable only to VAV mode of op-
eration. If this option is selected ON, it tells the control
that a Thermostat in a selected space is used to reset the
SAT in cooling and to control heating. If this option is
selected OFF, the control assumes that a Space Sensor
in a selected space is used to reset SAT in cooling and
to control heating and self-configures into this mode if
the Space Sensor signal is reliable. If the Space Sensor
signal is not reliable (e.g. sensor is not connected), the
control will self-configure to stand-alone operation.
VAV Control Offset
The VAV Control Offset parameter is used to adjust the
compressor staging offset and is used in conjunction
with the VAV Cool High Temp and VAV Cool Low
Temp setpoints on VAV units.
FORM 100.50-NOM7 (808)
55
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