Manual 2100-414C
Page
15
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.
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).
"O1"
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.
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, O1
Emergency Heat
Energize B, W2, E, G
Dehumidification
Energize W3
TABLE 4
WALL THERMOSTAT AND SUBBASE COMBINATIONS
t
a
t
s
o
m
r
e
h
T
e
s
a
b
b
u
S
s
e
r
u
t
a
e
F
t
n
a
n
i
m
o
d
e
r
P
2
4
0
-
3
0
4
8
)
0
7
0
1
G
1
1
5
8
T
(
-
-
-
t
a
e
h
.
g
t
s
2
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c
.
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b
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m
m
a
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-
n
o
N
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t
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g
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a
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c
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a
M
r
o
o
t
u
A
9
4
0
-
3
0
4
8
)
0
8
3
-
3
9
F
1
(
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3
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A
