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MSEV Series and USHX Hardware Installation Manual Rev 1.7
3.
Install the transformer or power supply at the center of the all the USHXs.
The below wiring methodology is recommended so that the load of the controllers
on either end of the transformer will be the same.
Figure 3-5 Multiple USHCs and MSEV series valves networking diagram
The wiring schemes of the ‘Multiple USHCs and MSEV Series Valves’ setup and
‘Multiple USHSs’ setup are the same except that the PWM output wires of each
USHS for the ‘Multiple USHSs’ setup process should be disconnected, terminated
with wire nuts, and wrapped with electrical tape so that they do not form short
circuits with each other or any other wires or metal surfaces. As for the ‘Multiple
USHCs with Multiple MSEV Series Valves’ setup process, the PWM output wires
should be connected to the valves as shown in Figure 3-5.
4.
Double check the power source output voltage (AC transformer secondary or DC power supply
output).
The reading should be at or near 12VDC, 24VDC, or 24VAC depending on the MSEV
series valve and power source. When supplying 24V, the voltage must be within the
range of 20.4V to 27.6V. When supplying 12V, the voltage must be within the range
of 10.2V to 13.8V. Do NOT Earth-ground the power source output.
5.
Once the power source output voltage has been identified and checked to be accurate, ensure
that the power supply is off before continuing with the steps below.
