VisionPRO™TH8000 Series
Wiring
Wiring
guide-heat
pump
systems
Shaded areas below
apply
.only
to
TH8320ITH8321.
1H/1C
Heat
Pump
(no
auxiliary
heat)
2H/2C
Heat
Pump
(no
auxiliary
heat)
Power [1]
Y2
Compressor 2 relay
:C3
[R+Rc joined
b~
jum~er]
Power [1]
:CJ
O/B
Changeover valve
[5]
[R+Rc joined
by
jumper]
Y
Compressor
rela~
OIB
Changeover valve [5]
G
Fan
rela~
Y Compressor 1 relay
C 24VAC
common
[3]
G
Fan
rela~
S1
Optional outdoorlremote sensor
C
24VAC
common
[3]
52
Optional outdoor/remote sensor
51
Optional outdoor/remote sensor
52
Optional outdoor/remote sensor
2H/1C
Heat
Pump
(with
auxiliary
heat)
L
Eguipment
monitor
[6, rl
3H/2C
Heat
Pump
(with
auxiliary
heat)
E
Emergenc~
heat
rela~
[8]
Y2
Compressor 2 relay
Aux
Auxiliary heat
rela~
(Heat
2~
[81
L
Eguipment monitor [6,
7]
Power[:!l
E Emergency heat relaY
[8]
:C3
[R+Rc joined
b~
jumper]
Aux
Auxiliary heat relay (Heat
2)
[8]
OIB
Changeover
val'\(9
[5]
Power [1]
:CJ
Y
Compressor
rela~
[R+Rc joined
by
jumper]
G
Fan
rela~
OIB
Changeover valve
[5]
C
24VAC
common
[3] Y Compresso( 1 relay
S1
OptiOri!i1 outdoor/remote sensor
G
Fan relay
S2
Optional outdoor/remote sensor C
24VACcommon
[3]
S1
Optional outdoor/remote sensor
S2
Optional outdoor/remote ·sensor
See
[notes]
below
[1] Power supply. Provide
disconnect
means and overload protection as required.
[3] Optional 24VAC
common
connection.
[5]
OIB
set
to
control as either 0
or
B in installer setup.
[6]
If
L terminal
is
used, 24VAC
common
(terminal C) must
be
connected.
[7] Heat
pump
reset (powered continuously when thermostat
is
set
to
Em. Heat; system
monitor
when set
to
Heat, Cool,
or
Off).
[8] Install field
jumper
between
Aux
and E terminals
if
there
is
no
emergency heat relay.
5
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