IMPORTANT!
When SmartPlate Water Heaters are shipped from the factory, all four isolation ball valves
and the drain valve (Figure 1-3) are opened. Close all valves during installation. Do not open
the valves until instructed to do so in Chapter 5 of this manual.
2.5 SMARTPLATE ELECTRICAL WIRING CONNECTIONS
The SmartPlate ECS/SP Control Box and all other ECS/SP components are installed on the unit
prior to shipment from the factory. Therefore, electrical connections to the ECS/SP basically
consist of connecting external AC power to the ECS/SP Control Box. The system can be
powered by a single-phase AC voltage of 120 VAC, 60 Hz, 220 VAC, 50 Hz or 220 VAC 60 Hz.
However, if the ECS/SP was ordered with the Modbus Communication option, several additional
signal lead connections will need to be made inside the Control Box. These signal leads will
permit the ECS/SP to be controlled by an external Energy Management System (EMS), Building
Automation System (BAS), or Computer. Proceed as follows:
NOTE:
Following installation, a lock (Not Supplied) can be installed on the front door of the Control
Box, if desired, to prevent unauthorized access to ECS settings.
1. Loosen the captive screw on the right-front portion of the Control Box (Figure 2-4) to open
the hinged panel door.
Figure 2-4. ECS/SP Control Box Front View
2. Next, open the door and loosen the captive screw at the top of the recessed panel (Figure
2-5).
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