116 Appendixes
12.2 Wiring Diagram
AC24V
T/S INPUT
***LWCO
***Flow Switch
(E765)
System Supply **Temp Sensor
System Return **Temp Sensor
Outdoor **Temp Sensor
DHW Tank **Temp Sensor
0-10 VDC Output
Supply **Temp Sensor
Water Pressure Sensor
Blower
AC Gas Valve
(NFB-399C)
Thermal Fuse
(Burner)
Burner
Flame Rod
Igniter
Blower
Supply Voltage
Graphic Panel
*T/S_1
LNG
ON
OFF
Boiler Pump FUSE
(250VAC_10A)
ZONE3 Pump FUSE
(250VAC_10A)
ZONE2 Pump FUSE
(250VAC_10A)
ZONE1 Pump FUSE
(250VAC_10A)
DHW Priority
Air Handler
Boiler State
Boiler Error
Boiler
Pump
CND1
CND2
CNP1
CNP2
CNA1
CNR2
CON1
T/S ZONE1
T/S ZONE2
T/S ZONE3
CNC1
CNC5
CNC6
CNC7
CNC3
CNC8
CNC9
CNC2
CNC10
CNT1
CNT2
CNT3
CNT4
CNU1
CNU2
CNG1
CNH1
CNJ1
CNK1
CND1
CNA1
CNI1
CNB1
AC_N
ZONE1
Pump
ZONE2
Pump
ZONE3
Pump
NC
Neutral
Live
Live
LWC O
AC24V
T/S INPUT
*T/S_2
AC24V
T/S INPUT
*T/S_3
*T/S_4
AC24V
T/S INPUT
Manual Reset Safety Switch
(E774)
Power Trans
AC_L
IN
OUT
AC_N AC_L
IN
OUT
AC_N AC_L
IN
OUT
Ground
Ground
Ground
NO
COM
0-10 VDC Input
Auto Reset Safety Switch
(E775)
Return **Temp Sensor
Exhaust 1 **Temp Sensor
Exhaust 2 **Temp Sensor
/'#
Dual
Venturi
CNO1
Ground
-
+
-
+
(24V 75VA)
Ground
Cascade Line
Air Pressure Sensor
High Temp Limit
WARNING
ELECTRICAL SHOCK HAZARD
For your safety, turn o electrical power supply
before making any electrical connections to avoid
possible electric hazard. Failure to do so can cause
severe personal injury or death.
Pumps must be electrically grounded as required
by National Electrical Code.
*T/S: Thermostat
**Temp: Temperature
***Factory jumper is connected as default.
Remove it when using an additional appliance.
NOTICE
Ground
Main Switch
Terminal
Block
External Input (AC 120V)
DC Gas Valve1
(NFB-301C)
DC Gas Valve2
(NFB-301C)
AC_L
Ground
1 2
O
N
0/
A
B
G
ModBus / BACnet
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