Fantech VHR 704 Installation Manual - Electrical Connections
16
W
R
G
C
Y
W
R
G
Y
Standard Furnace Interlock Wiring
THERMOSTAT
TERMINALS
FURNACE
24-VOLT
TERMINAL BLOCK
FOUR
WIRE
TWO WIRE
heating only
TWO
WIRE
COOLING SYSTEM
HRV
ELECTRONIC BOARD
W
R
G
C
Y
W
RG
Y
Alternate Furnace Interlock Wiring
THERMOSTAT
TERMINALS
FURNACE
24-VOLT
TERMINAL BLOCK
FOUR
WIRE
TWO WIRE
heating only
TWO
WIRE
COOLING SYSTEM
HRV
ELECTRONIC BOARD
WIRE JOINT
ELECTRICAL CONNECTIONS
(CONT'D)
Caution:
• Never connect a 120 volt AC
circuit to the terminals of the
Accessory Control Contacts.
Only use the low voltage
class 2 circuit of the fur-
nace blower control.
For a Furnace Connected to a
Cooling System:
• On some older thermostats,
energizing the R and G
terminals at the furnace 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
Interlock Wiring”.
PRACTICAL TIPS
ELECTRICAL CONNEC-
TION TO A FURNACE
Standard Accessory Control Contact
Alternate Accessory Control Contact
Item #: 403409
Rev Date: 030806
Fantech, reserves the right to modify, at any time and without
notice, any or all of its products’ features, designs, components and
specifications to maintain their technological leadership position.
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