Fantech VHR704R 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
R
G
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 termi-
nals of the Accessory Control
Contacts. Only use the low
voltage class 2 circuit of
the furnace blower control.
For a Furnace Connected to a
Cooling System:
• On some older thermostats,
energizing the R and G termi-
nals 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
Alternative Accessory Control Contact
Item #: 404663
Rev Date: 110909
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any or all of its products’ features, designs, components and specifica-
tions to maintain their technological leadership position.
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Fax: 800.487.9915; 913.752.6466
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