SmartPlate Installation, Operation & Maintenance Manual
CHAPTER 1 – GENERAL INFORMATION
1.3 SMARTPLATE PIPING ASSEMBLIES
The diameter of the piping assemblies furnished with the water heater will depend on the size of
the heat exchanger installed in the SmartPlate model ordered. Smaller sized models utilize 1.5”
piping assemblies, while the larger sizes utilize 2” piping assemblies. Refer to Table 1-1 below
for the size of the piping assemblies used in each Single-Wall and Double-Wall SmartPlate
model.
In addition to the heat exchanger and piping components, each SmartPlate Piping Assembly
contains a number of other important components and assemblies. The items include:
• Mixing box
• Recirculation Pump, (Continuously ON)
• Isolation & Drain Valves
• Strainers (Boiler Water & DHW Sides)
• Blow-down Valves
• Relief Valve
• Air Vent Valve
Figure 1-3 illustrates the locations of the above-mentioned items for a single-wall heat
exchanger. Piping components are similar for double-wall models.
1.4 ELECTRONIC CONTROL VALVE, MXG-461
The 3-Way Electronic Control Valve (Siemens MXG-461) is powered by 24 VAC which is
received from the ECS/SP Control Box. The Temperature Controller in the Control Box supplies
a 0 – 10 VDC control signal to precisely modulate the 3-Way Valve to accurately control the
temperature of the DHW output to the desired setpoint. The Control Valve is shown in Figure 1-
4. The connection unions have flat face gaskets that provide the fluid seal.
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