14
3. CONTROLS (
CONT
’
D
)
Once the control(s) connections have been made, insert the terminal
connector on the recessed side of electrical compartment.
NOTE: For information about the operation of the wall controls, refer to the
user
guide.
VD0206
B
OTTOM
OF
THE
UNIT
T
ERMINAL
CONNECTOR
4. ELECTRICAL CONNECTION TO THE FURNACE/AHU
WARNING
!
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
W
R
G
Y
W
R
G
C
Y
UNIT TERMINAL
CONNECT
OR
THERMOSTAT
TERMINALS
FOUR
WIRES
TWO WIRES
heating only
FURNACE
24-VOLT
TERMINAL BLOCK
TWO WIRES
COOLING SYSTEM
N
O
C
N
C
I O
C
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
CONNECT
OR
N
O
C
N
C
I OC
O
L
Y
R G B
VE0108A
3.6 E
LECTRICAL
C
ONNECTION
TO
O
PTIONAL
A
UXILIARY
C
ONTROLS
(
ALL
UNITS
)
NO C NC I OC OL Y R G B
VE0371
59W
VB60W
FURNACE
/AHU
24-
VOLT
TERMINAL
BLOCK
FURNACE
/AHU
24-
VOLT
TERMINAL
BLOCK