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Boiler Control Instruction & Operation Manual
Page 2
3
of 68
Installation
Energy Management Interface
Remote Demand Setup Screens Continued:
Factory
Setting
Range /
Choices
Parameter and Description
0.1
0 - 10
Analog Input Hysteresis
This parameter adjusts the amount of hysteresis applied remote control input when
modulation source is set to 4-20mA. A zero value disables this feature.
10
0 - 10
Analog output hysteresis
This parameter adjusts the amount of hysteresis applied to the PID output when a
non-PWM modulation is selected. The value determines how much the PID is
required to change in a new direction before the output will change. A zero value
disables this feature.
Connecting a EMS Modbus Interface
Table 7: Energy Management System Interface Procedure
Step
Description
Comments
1
Install Ethernet
Cables between
boilers
Use standard Ethernet type cables to make connection between boilers.
When more than two boilers are connected an RJ45 splitter may be used
to connect the boilers. Refer to Figure 15.
NOTE
The same Ethernet cable that connects the Boiler-To-Boiler Sequence
Master also connects the EMS Modbus signals. Refer to Figure 14 for
detail.
2
Enable EMS
Communication
Communication must be enabled. Go to Modbus menu (Press Menu >
EMS Interface > Modbus Setup) and
“Press” EMS Enable/Disable to
Enable.
3
Set Unique Modbus
Addresses
“Comm
HMI Station
”
The EMS Modbus address may be independent to the Boiler number or
boiler address. Go to Modbus menu (Press Menu > EMS Interface >
Modbus Setup) and select EMS Modbus Parameters.
Follow on screen
instructions.
NOTE
Each boiler must have a unique
Comm HMI Station
address.
4
Adjust
Communication
Parameters
Communication Parameters are adjustable. Go to Modbus menu (Press
Menu > EMS Interface > Modbus Setup) and select EMS Modbus
Parameters. Follow on screen instructions.
NOTE
Baud Rate
and
Parity
must match the EMS settings for communication to
be established.
9
Confirm
Communication
The display provides a list of all EMS signals. Go to Modbus menu (Press
Menu > EMS Interface) and select Points List. Use the list to verify signals
sent and received from the EMS.