Control Options
Return Water Temperature Display
This option allows the To Process digital display to indicate To
Process or Return Water temperatures. To view the Return
Water temperature, hold down the Lower Set Point Temperature
and Raise Set Point Temperature buttons simultaneously. Once
the buttons are released, the display will return to the To
Process temperature.
Remote On/Off Contacts
This option allows the unit to be turned on and off via a remote
contact closure. Two terminals are provided in the control panel
to be wired to a remote contact closure device. Switching the
contacts from open to close simulates pressing the Start button
on the control panel. Switching the contacts from closed to
open simulates pressing the Stop button. Please note that the
Remote On/Off contacts are nonfunctional until the Power but-
ton has been depressed and the control circuit has been ener-
gized. This option also includes a remote/local toggle switch
that allows the operator to disable the remote contacts for safety
purposes while the unit is being serviced.
Note: Do not introduce any external voltage to these con-
tacts as this will result in damage to the microprocessor,
which will not be covered by the warranty.
Remote Alarm Contacts
This option includes a set of dry (no voltage induced by the
unit), normally open contacts that will close when there is an
alarm condition. Refer to Table 2 for the Microprocessor Control
Fault Logic to determine which faults will trigger the Remote
Alarm contacts. The contacts will reopen by clearing the fault or
by pressing the Alarm Silence button.
Alarm Horn
This option includes an alarm horn that will be activated by cer-
tain faults. Refer to Table 2 for the Microprocessor Control Fault
Logic to determine which faults will trigger the Alarm Horn. The
Alarm Horn will be silenced by clearing the fault or by pressing
the Alarm Silence button. If this option is selected in
conjunction with the remote control panel, the Alarm Horn will
be mounted on the unit and not the remote control panel.
Remote Control Panel
This option removes the display and control buttons from the
unit and places them in a small hand-held NEMA-1 enclosure.
Included with this option is a 50 Ft (15 M) cable to connect the
controller and the unit. All control functions are available to the
operator at the location of the remote panel and no control
functions are available at the location of the unit
.
SPI Communications
This option provides an RS-485 communication port located
below the control panel on the front of the unit. The serial
communications will be multi-drop, half duplex, SPI 3.01
compatible and will allows the unit to communicate with another
piece of equipment that also has SPI protocol capabilities.
The following SPI communications are supported by the
microprocessor.
Process Temperature Set Point
High Temperature Deviation
Low Temperature Deviation
Process Status
To Process Temperature
The microprocessor is designed to accept inputs and deliver
outputs according to SPI protocol. There must also be a
computer or another piece of equipment that is equipped with
the SPI protocol in order for the communications from the unit
to be of any use. The programming of this computer and/or
other equipment is not the responsibility of the manufacturer.
Note: The manufacturer is not responsible for SPI protocol
programming beyond what is included in the
microprocessor controller.
When the SPI option is purchased, there is a second set of DIP
switches included on the back of the main control panel. This
set of DIP switches is labeled "COMM". All DIP switch
adjustments that follow are to be made on the COMM set. Do
not adjust any DIP switches on the CONFIG set.
Note: All DIP switch changes must be made with power
disconnected.
In order to activate the SPI protocol, DIP switch #8 must be set
to the "On" position. To deactivate the SPI communication, set
DIP switch #8 to the "Off" position.
If more than one piece of equipment is going to be on the same
communications network, the base address will have to be
changed so that each unit has a unique address. This is done
by changing one or more of the DIP switches to the "Off" posi-
tion. The base address is 32 decimal. Changing these switches
causes the following address change.
DIP Switch 1 OFF adds one to base address
DIP Switch 2 OFF adds two to base address
DIP Switch 3 OFF adds four to base address
DIP Switch 4 OFF adds eight to base address
DIP Switch 5 OFF adds sixteen to base address
The BAUD rate can be adjusted to the appropriate setting by
using the information found in Table 4.
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