Installation
25
│
Page
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.
PUMP
CONTROL
CONNECTION
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.
CAUTION
Connect
to
this
“Pump
connector”.
Recirculation
pump
Power
supply
for
pump
AC120V
AC220V
etc
Power
supply
for
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.
Thermal
relay
AC120V
AC220V
etc
for
relay
