Pump Control Connection - Takagi T‐H2‐DV Installation Manual And Owner's Manual

The T‐H2‐DV/T‐H2‐OS 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‐H2‐DV/T‐H2‐OS 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‐H2‐DV/T‐H2‐OS as shown in the diagram below. (In an Easy‐Link 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‐H2‐DV/T‐H2‐OS's internal thermistors as a temperature control, the recirculation pump will
only turn on when recirculation is needed.
In an Easy‐Link 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.
CAUTION
PUMP CONTROL CONNECTION
Connect to this "Pump connector".
Thermal
relay
These components are NOT included with the T‐H2‐DV/T‐H2‐OS
and are external to the unit. They must be acquired separately.
Power supply
for pump
AC120V
AC220V etc
AC120V
AC220V etc
for relay
25
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Page
Installation
Power supply
for relay