GND DAT 5V
NC C
NO
LO/HI
SPEED
HV INPUT
Remote
ON/OFF
(HV-High Voltage)
NO
C
NC
(These connections
must be done inside
the electrical box)
Low Voltage
+5
DAT
C
Sp
ee
d
C
ont
ac
t
L0/HI
Speed
HV Input
Remote
0n/0ff
HV
NC
C
N0
HIGH VOLTAGE
Ext. Interlock
FOUR WIRE
OLDER VERSION OF CONTROLBOARD
Furnace, Fan Coil,
Heat Pump
Interlock
GND DAT 5V
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 Interlock Wiring”.
Wiring Diagram
(cont’d)
6
Furnace / Fan-Coil / Heat Pump Interlock:
Standard Interlock Wiring
W
R
G
Y
C
TW OWIRE
heating only
Cooling
System
THERMOSTAT TERMINALS
W
R
G
Y
TWOWIRE
!
W A R N I NG
!
Never connect a 120 volt AC circuit to the terminals of the furnace/fan-coil/heat pump interlock (Standard Wiring).
Only use the low voltage class 2 circuit.
Note: These Connections must be done inside the electrical box
LO/HI
SPEED
HV INPUT
Remote
ON/OFF
(HV-High Voltage)
NO
C
NC
(These connections
must be done inside
the electrical box)
Low Voltage
+5
DAT
C
Sp
ee
d
C
ont
ac
t
L0/HI
Speed
HV Input
Remote
0n/0ff
HV
NC
C
N0
HIGH VOLTAGE
Ext. Interlock
FOUR WIRE
OLDER VERSION OF CONTROLBOARD
Furnace, Fan Coil,
Heat Pump
Interlock
GND DAT 5V
NEWER VERSION OF CONTROLBOARD
W
R
G
Y
C
TWOWIRE
heating only
Cooling
System
THERMOSTAT TERMINALS
W
R
G
Y
TW OWIRE
YE
LLO
W
NEWER
VERSION
OF
CONTROLBOARD
(For
RHRV-C100PNF,
RERV-C100NF)
(For
RHRV-C100PNF,
RERV-C100NF)
Note:
These
Connections
must
be
done
inside
the
electrical
box
