State 520 - Manual (Page 24)

Installation
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Page
In an Easy‐Link system, the pump must be connected to the “Pump connector” in
the “PARENT unit” only. If the pump is connected to any of the “CHILD units”, the
pump will not work.
PUMP CONTROL CONNECTIONS
The water heater can be used to control a recirculation pump. Proper pump control helps to preserve
the life of the system and saves energy as well.
The water heater pump control port is a “normally open dry contact”, and therefore needs additional
components to properly control a recirculation pump. To control a recirculation pump, connect the
pump to the “Pump connector” in the water heater as shown in the diagram below. (In an Easy‐Link
system, connect the pump ONLY to the “PARENT” unit.) The pump is to be connected using suitable
relays shown in the diagram below.
Please make sure the relays are properly rated for the recirculation pump.
Using the water heater’s internal thermistors as a temperature control, the recirculation pump will only
turn on when recirculation is needed.
CAUTION
Connect to this “Pump connector”.
Rec
irculation pump
Power supply
for pump
120 VAC
220 VAC etc
Power supply
for relay
These components are NOT included with the water heater and
are external to the unit. They must be acquired separately.
Thermal
relay
120 VAC
220 VAC etc
for relay