SmartPlate EV Installation, Operation and Maintenance Manual
CHAPTER 1
– GENERAL INFORMATION
OMM-0147_C
• SP-102 • 3/2/2021 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page
8
of
72
1.3.1
The Control Box Assembly
The front panel on the Control Box contains the following components:
•
Temperature Controller:
This device
is the “brain” of the ECS II, processing data
received from the temperature sensors. Using feed forward and PID (Proportional
Integral Derivative) algorithms, the Temperature Controller provides a 4 to 20 mA 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.
Figure 1.2.1. Temperature Controller
•
Over-Temperature Indicator/Switch:
This device 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 audible alarm and cuts off power to the Control Valve Actuator thereby closing the
Control Valve and shutting off the boiler water flow to the unit.
The Boiler Water inlet temperatures is sensed on the surface of the inlet pipe and is provided for
informational and troubleshooting purposes only.
The Control Box components are housed in a steel enclosure
mounted on the top of the unit’s
base. All sensor and control signal connections are made via cable connections at the right side
of the Control Box. External AC power (120 VAC, 60 Hz, 220 VAC 50 Hz or 220V, 60 Hz) is
supplied via the cutout on the right-side of the Control Box.
1.3.2
Flow Meter
A Flow Meter is installed on the domestic cold-water inlet. It senses inlet flow into the unit and
provides a signal to the temperature controller. The Controller uses this signal to calculate the
amount of heat input required from the boiler loop.
DHW OUTLET TEMPERATURE
SETPOINT
