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Installation (continued)
Pump Relay Connection
L This controller does not
provide mains power to
drive a pump–a pump
must be driven via an
external relay and contactor
(pump start) setup
L The controller provides
a low voltage signal that
actuates the relay which in
turn enables the contactor
and finally the pump
® Although the controller has
permanent memory and
thus a default program
will not cause erroneous
valve actuation, it is still
good practice when using
a system where the water
supply comes from a
pump to connect unused
zones on the unit back
to the last used zone
® This in effect, inhibits
the chances of the
pump ever running
against a closed head
Pump Protection
L In some circumstances not
all operational zones may be
hooked up–for example, if
the controller was capable
of running 6 zones but
there were only 4 field
wires and solenoid valves
available for connection
® This situation can pose a
risk to a pump when the
system test routine for
the controller is initiated
® The system test routine
sequences through
all available zones
on the controller
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