Manual 2100-413G
Page
18 of 28
LOW VOLTAGE CONNECTIONS
These units use a grounded 24 volt AC low voltage
circuit.
The
“R”
terminal is the
hot
terminal and the
“C”
terminal is
grounded.
“G”
terminal is the
fan input
.
“Y”
terminal is the
compressor input
.
“B”
terminal is the
reversing valve input
. The reversing
valve must be energized for heating mode.
“R”
terminal is
24 VAC hot
.
“C”
terminal is
24 VAC grounded.
“L”
terminal is
compressor lockout
output
.
This
terminal is activated on a high or low pressure trip by
the electronic heat pump control. This is a 24 VAC
output.
“W2”
terminal is
second stage heat
(if equipped).
"01"
terminal is the
ventilation input
. This terminal
energizes any factory installed ventilation option.
“E”
terminal is the
emergency heat input.
This terminal
energizes the emergency heat relay.
"W3"
terminal is the
dehumidification input
. This
terminal energizes compressor, blower and three-way
valve.
NOTE: For total and proper control using DDC, a
total of 7 controlled outputs are required (6 if
no ventilation system is installed). For proper
system operation under Emergency Heat
conditions where the compressor needs to be
deactivated, the B-W2-E outputs need to be
energized. Removing the Y (compressor) signal
alone turns the compressor off, but does not
activate the additional circuitry embedded in
the heat pump for proper and complete
operation.
TABLE 3
WALL THERMOSTAT
t
a
t
s
o
m
r
e
h
T
s
e
r
u
t
a
e
F
t
n
a
n
i
m
o
d
e
r
P
8
5
0
-
3
0
4
8
)
1
5
1
1
D
0
2
2
5
H
T
(
t
a
e
h
e
g
a
t
s
2
;
l
o
o
c
e
g
a
t
s
2
e
l
b
a
m
m
a
r
g
o
r
P
-
n
o
N
c
i
n
o
r
t
c
e
l
E
r
e
v
o
e
g
n
a
h
c
l
a
u
n
a
M
r
o
o
t
u
A
0
6
0
-
3
0
4
8
)
5
4
4
-
0
2
1
1
(
t
a
e
H
e
g
a
t
s
3
;
l
o
o
C
e
g
a
t
s
3
c
i
n
o
r
t
c
e
l
E
e
l
b
a
m
m
a
r
g
o
r
P
-
n
o
N
/
e
l
b
a
m
m
a
r
g
o
r
P
r
e
v
o
e
g
n
a
h
c
l
a
u
n
a
M
r
o
o
t
u
A
;
l
a
n
o
i
t
n
e
v
n
o
C
r
o
P
H
t
a
t
s
i
d
i
m
u
H
h
t
i
w
LOW VOLTAGE CONNECTIONS
FOR
DDC CONTROL
Fan Only
Energize G
Cooling Mode
Energize Y, G
Heat Pump Heating
Energize Y, G, B
2nd Stg Heating
Energize G, W2, Y, B
w/Heat Pump (if employed)
Ventilation
Energize G, 01
Emergency Heat
Energize B, W2, E, G
Dehumidification
Energize W3
