Smart Temp SMT?770 Installer Manual - Control
33
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P a g e
Control
logic
This
simple
diagram
(right)
provides
a
general
insight
into
the
control
logic
of
the
SMT
‐
770
thermostat.
It
attempts
to
describe
the
action
of
the
DB=XX,
the
SP=XX
and
SD=XX
advanced
installer
control
capabilities
in
both
two
set
point
and
single
set
point
mode.
By
adjusting
these
three
values
to
suit
the
needs
of
the
user
or
equipment
extremely
tight
temperature
control
can
be
achieved,
or
a
more
energy
efficient
temperature
control
profile
can
be
set.
In
single
set
point
mode
(sw8=off)
the
individual
heating
and
cooling
set
points
are
replaced
by
a
“Dead
Band”
where
the
heating
and
cooling
differential
is
controlled
by
a
installer
set
value.
This
is
the
simplest
method
of
temperature
control.
Further,
you
are
able
to
adjust
how
quickly
the
SMT
‐
770
“Chameleon”
thermostat
responds
to
room
temperature
changes
by
adjusting
the
RS=XX
value
in
the
installer
menu.
The
lower
this
setting
the
faster
the
thermostat
will
respond
to
room
temperature
fluctuations,
the
larger
this
number
the
slower
the
thermostat
will
respond
to
changes
in
room
temperature.