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3.5.29 CONSOLE SETPOINT MAXIMUM (V3.11 AND UP)
Note: The
CONSOLE SETPOINT MAXIMUM is not displayed on the optional 920 Operator Console.
Purpose: When using an optional 920 Operator Console (for V3.11 and up) the maximum set-
ting of the
CONTROL SETPOINT temperature may be limited to the CONSOLE SETPOINT MAXIMUM
value. This is a safety feature to prevent users in the field from modifying the
CONTROL SETPOINT
temperature setting to a dangerous level.
Range: –76°F to 1058°F (–60°C to 570°C)
Procedure: Adjust the
CONSOLE SETPOINT MAXIMUM temperature value to limit the maximum
allowable
CONTROL SETPOINT TEMPERATURE that may be set using the optional 920 Operator
Console. The
CONSOLE SETPOINT MAXIMUM may only be set using a communicating device such
as the Model 780/GCC-9000. See the 780/GCC-9000 manual for the proper procedure.
3.5.30 CONSOLE SETPOINT MINIMUM (V3.11 AND UP)
Note: The
CONSOLE SETPOINT MINIMUM is not displayed on the optional 920 Operator Console.
Purpose: When using an optional 920 Operator Console (for V3.11 and up) the minimum setting
of the
CONTROL SETPOINT temperature may be limited to the CONSOLE SETPOINT MINIMUM value.
This is a safety feature to prevent users in the field from modifying the
CONTROL SETPOINT tem-
perature setting to a dangerous level.
Range: –76°F to 1058°F (–60°C to 570°C)
Procedure: Adjust the
CONSOLE SETPOINT MINIMUM temperature value to limit the minimum
allowable
CONTROL SETPOINT TEMPERATURE that may be set using the optional 920 Operator
Console. The
CONSOLE SETPOINT MINIMUM may only be set using a communicating device such
as the Model 780/GCC-9000. See the 780/GCC-9000 manual for the proper procedure.
3.6 Common Controller Setup
The following section describes the setup parameters that are common for both of the two con-
trol points—Point A and Point B. These parameters need only be configured once to define their
operation for both control points.
3.6.1 TEMPERATURE DISPLAY UNITS
Purpose: This allows selection of the type of temperature units to display when using the 920
Operator Console. All temperature-related values will be displayed in the selected units.
Note: This setting will not affect the temperature units displayed at a 780/GCC-9000 Group Com-
munications Controller. The
GCC may be set independently.
Setting: DEGREES C or DEGREES F
Procedure: Adjust the setting to the desired temperature units (°F or °C).
Note: To minimize possible confusion, temperature units should be set the same on the HTC and
any other communicating devices.
3.6.2 VERSION OF FIRMWARE AND HARDWARE
Purpose: The first three digits of the version number indicate the revision level of the firmware
programmed into the controller. As new features are added to the
HTC, the firmware revision
level is incremented to allow the user to determine which features are available for the particular
unit being used. The fourth digit (V3.11 and up only) indicates the type of 920 hardware. A “0”
indicates that an
EPROM is being used, which means the firmware cannot be upgraded without
replacing the
EPROM. A “1” indicates that the firmware is stored in a FLASH memory device and
can be upgraded via the optional communications interface.
3.6.3 EXTERNAL INPUT PORT
Purpose: This input port may be used as an
OVERRIDE SOURCE or a TEMPBUS™ temperature
source for either point. As an
OVERRIDE SOURCE, it can sense a remote dry contact closure and
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