Smart Temp SMT?770 Installer Manual - Stage
28
|
P a g e
Sd
=
2
Stage
2
Span
(See
page
33 for
an
overview
of
this
control function)
Hysteresis
for
Stage
2.
(difference
between
heating
and
cooling
turning
on
and
off)
Sd
=
1
0.5c
Sd
=
2
1.0c
Sd
=
3
1.5c
S3
=
2
Stage
3
Heat
Span
When
set
to
2
stage
heat
pump,
this
value
sets
the
span
for
the
3rd
stage
heating.
SU
=
10
Smart
Upstage
When
the
room
temperature
is
far
enough
from
the
set
temperature
to
call
extra
heating
and
cooling
stages,
the
SMT
‐
770
will
wait
the
minimum
Su=
value
before
bringing
on
extra
stages.
This
delay
provides
time
for
the
thermostat
to
determine
whether
additional
stages
are
needed
or
if
the
current
stages
will
bring
the
room
to
set
point
in
a
“reasonable”
period
of
time.
dt=
30
Upstage
delay
time
Time
in
minutes
before
next
stage
of
heating
or
cooling
is
to
be
called.
Delay
only
operates
if
stage
trip
temperature
has
not
yet
been
reached.
Adjustable
between
10
~
90
Minutes
in
5
minute
steps.
oS
=
0
Optimised
Start/stop.
(Adaptive
Recovery)
OS
=
0
‐
Optimised
start/stop
function
Off.
OS
=
1
‐
Optimised
start/stop
function
running.
(See
page
42
for
more
information
on
this
function)
C2
=