Emerson Sensi ST75, Installation Manual

Page: 7 / 20

7
SINGLE S
TA
GE OR M
UL
TI-S
TA
GE S
YS
TEM NO HEA
T PU
MP) WITH TW
O TRANSFORMERS
Syst
em
Configur
ation
Thermostat
*
*T
w
o tr
ansf
ormer
s s
yst
ems (separ
at
e R
C and RH wir
es), clip int
ernal R
C/RH jumper
, l
ocat
ed on back of thermostat.
HOT
120 V
AC
NEUTRAL
HOT 120 V
AC
NEUTRAL
NEUTRAL 24 V
AC
HOT
NEUTRAL
24 V
AC
HOT
Cooling T
ransf
ormer
Heating T
ransf
ormer
Dots Indicat
e
Phased
Relationship
Dots Indicat
e
Phased
Relationship
Singl
e
Stag
e
AC
1
GA1 EL1
24 V
olt
(Hot) Cool
24 V
olt
(Hot) Heat
24 V
olt
(C
ommon)
Cool Mode
1st stag
e
Blowe
r
Cir
culat
or
Fa
n
Energized On Call For C
ool
(And Heat If C
onfi-
gur
ed
For El
ectric
Heat)
O
Energized Constantly
in C
ool
M
ode
(F
act
or
y
Default)
B
Energized Constantly
In Heat Mode
(Or
Aux M
ode)
Heat M
ode
1st Stag
e
Heat
Pump “L
”
Terminal Connection
Cool Mode
2nd Stag
e
No
Output
Heat Mode
2nd Stag
e
No
Output
Multi- Stag
e
AC
2
GA2 EL2