Takagi T-M32 - Manual (Page 21)

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PUMP CONNNECTION
The T-M32 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 T-M32 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 T-M32
as shown in the diagram below. (In a multi-unit system, connect the pump ONLY to the
“MASTER” 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 T-M32’s internal thermistors as a temperature control, the recirculation pump will only
turn on when recirculation is needed.
CAUTION: In a multi-unit system, the pump must be connected to the
“Pump” connector in the “MASTER” unit only. If the pump is connected
to any of the “SLAVE” units, the pump will not work.
Power supply for relay
Power supply for pump
AC120V
AC220V etc
AC120V
AC220V etc
for relay
Thermal relay
Recirculation
pump
Connect to this “Pump” connector.
These components are not included with
Takagi water heaters and are external to
the unit. They must be acquired
separately.