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Relays R3, R4 and R5 have Dry Contact terminals. Unlike R1
and R2, they have no power. This allows the user to supply
power from a remote source or use power from the Output side
of the power block.
In Figure 25, we show a jumper wire from the Fused Power
output block Line terminal to the Com input on R3 the left
terminal. The NO terminal is used to power the outlet plug
Center terminal, also black wire. This wire joins the Neutral and
Ground wires coming from the power block.
Figure 25 Wiring R3 using on-board fused power
6.3.5.5 Wiring Relays R3 R5 Using an External Power Source
An external power source can be used on relays R3, R4 and R5. Figure 26 illustrates
an external voltage connected to relay R5 at the COM terminal (black wire). A second
wire (red) on the NO terminal is the switched output to a pump, solenoid, alarm light,
etc. The neutral and ground wires are not terminated in the controller.
Figure 26 Using external power
6.3.5.6 Wiring Motor Operated Valves (MOV) to Relays R3 - R5
Motor Operated valves typically have
two hot wires, a neutral and a ground.
The two hot wires will be terminated
on the NO and NC terminals. The NO
terminal will open the valve when the
controller turns on the output relay.
Figure 27 shows internal power used
on R3 and external power used on R5
to control an MOV.
Figure 27 Motor Operated Valves wired to R3 and R5
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