Electrical Connections - Robertshow SHR Serie Manual Del Usario

ELECTRICAL CONNEC-
TION TO A FURNACE
PRACTICAL TIPS
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".
18

ELECTRICAL CONNECTIONS

Standard Accessory Control Contact
Standard Furnace Interlock Wiring
W
FOUR
WIRE
TWO WIRE
heating only
W
R
G
C
Y
FURNACE
24-VOLT
TERMINAL BLOCK
Alternate Accessory Control Contact
Alternate Furnace Interlock Wiring
W
FOUR
WIRE
TWO WIRE
heating only
W
R
WIRE JOINT
G
C
Y
FURNACE
24-VOLT
TERMINAL BLOCK
THERMOSTAT
TERMINALS
R G
Y
TWO
WIRE
THERMOSTAT
TERMINALS
R G
Y
TWO
WIRE
HRV
ELECTRONIC BOARD
COOLING SYSTEM
HRV
ELECTRONIC BOARD
COOLING SYSTEM