If desired, the ECS/SP can be ordered with a Modbus communication option. This option
permits the ECS/SP to be externally controlled by an Energy Management System (EMS),
Building Automation System (BAS), or a computer supplied by other manufacturers.
The ECS/SP assemblies and components are described in the following subordinate sections.
Figure 1-2. Electronic Control System/SmartPlate (ECS/SP)
1.2.1 CONTROL BOX ASSEMBLY
The front panel on the Control Box assembly contains all of the display devices for the ECS/SP.
These include the Temperature Controller, an Over-Temperature Indicator/Switch and Boiler
Water In/Out Temperature Indicators.
The Temperature Controller is the “brain” of the ECS/SP, which processes data received from
the temperature sensors. Using feed forward and PID (Proportional Integral Derivative)
algorithms, the Temperature Controller provides a 0 to 10 VDC control signal to the Control
Valve Actuator, which precisely modulates the Control Valve for optimum DHW outlet
temperature control. The upper display on the front panel of the Temperature Controller displays
the current DHW outlet temperature. The lower display continuously displays the DHW setpoint
temperature currently stored in the Temperature Controller.
The Over-Temperature indicator/switch included in the Control Box constantly monitors and
displays the unit’s outlet temperature to ensure it does not exceed the preset high temperature
limit. The over-temperature limit is factory-set 20°F above the unit’s setpoint temperature
specified on the sales order. If an over-temperature condition occurs, this device sounds an
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