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11
3. CONNECTIONS (CONT’D)
3.1.2 ELECTRICAL CONNECTION TO VT4W MAIN WALL CONTROL 3.1.3 ELECTRICAL CONNECTION TO VT6W MAIN WALL CONTROL
NO C NC I OC OL Y R G B
BG
G
B
Y
VE0328A
Y
NO C NC I OC OL Y R G B
VE0323
--5°C
23°F
5
°
C
41
°
F
C
O
M
F
O
R
T
Z
O
N
E
-20°C
-4°F
OFF
MIN MAX
#
X
X
X
X
X
0
1
/
9
8
3.1 ELECTRICAL CONNECTION TO OPTIONAL MAIN WALL CONTROL (CONT’D)
3.2 ELECTRICAL CONNECTION TO OPTIONAL AUXILIARY WALL CONTROLS
W R G
Y
W
R
G
C
Y
UNIT TERMINAL CONNECTOR
THERMOSTAT
TERMINALS
FOUR
WIRES
TWO WIRES
heating only
FURNACE
24-VOLT
TERMINAL BLOCK
TWO WIRES
COOLING SYSTEM
NO C NC I OC OL Y R G B
W R G Y
W
R
Y
R
G
Y
C
THERMOSTAT
TERMINAL
4 WIRES
2 WIRES
heating only
wiring
nuts
FURNACE
24-VOLT
TERMINAL BLOCK
2 WIRES
COOLING SYSTEM
NO
NC
C
UNIT TERMINAL CONNECTOR
NO C NC I OC OL Y R G B
VE0108A
Never connect a 120-volt AC circuit to the terminals of the furnace/AHU interlock (standard wiring). Only use the low
voltage class 2 circuit of the furnace/AHU blower control.
FOR A FURNACE/AHU CONNECTED TO A COOLING SYSTEM:
On some older thermostats, energizing the “R” and “G” terminals at the furnace/AHU has the effect of energizing “Y” at the thermostat and
thereby turning on the cooling system. If you identify this type of thermostat, you must use the
ALTERNATE FURNACE/AHU INTERLOCK WIRING.
STANDARD FURNACE/AHU INTERLOCK WIRING ALTERNATE FURNACE/AHU INTERLOCK WIRING
WARNING
!
3.3 CONNECTION TO THE FURNACE/AHU
VT4W
MAIN WALL CONTROL
REAR
VIEW
NO C NC I OC OL Y R G B
VE0371
59W VB60W VB60W
FURNACE/AHU
24-
VOLT
TERMINAL
BLOCK
FURNACE/AHU
24-VOLT
TERMINAL
BLOCK
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