29
Fig. 15
Mains circuit (View from the underside) -
Relays are shown in the power off position
Caution live
terminals
ac supply
Control relay
Alarm 1 relay
Back
Front
3 A fuses
Alarm
N L
See Mains wiring notes
Input
Norm
2 1
3 A fuse
N
ON / OFF control
Pump contactor
Modulating control
Control valve electric
actuator
(valve motor drive)
Pump contactor
N
5 4 38 7 6
22 21 20
Alarm
Input
Norm
Input
Open
Close
Alarm 2 relay
3 A fuse
5.3 Signal wiring notes
An earth current loop is created if a wire or screen is connected between two earth points
that are at different potential (voltage). If the wiring diagram is followed correctly, the screen
will only be connected to the earth at one end.
The earth terminal is a functional earth rather than a protective earth.
A protective earth provides protection from electric shock under a single fault condition. This
product has double insulation and therefore does not require a protective earth. A functional
earth is used in order for the product to operate. In this application, the earth is used as a
sink or drain for any electrical interference. The earth terminal must be connected to a local
earth in order to conform to the EMC directive.
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