Navien NHB Series - 12.3 Ladder Diagram

117Appendixes
12.3 Ladder Diagram
LIVE NEUTRAL
Dual Venturi
Relay 5
Relay 6
Relay 7
DC24V
DC12V
DC9V
DC5V
H.T.L(HE)
Blower
Igniter
Speed Control
Primary
WPS
UART
Communication
Interface
CASCADE
(RS-485)
Fan
Hall Sensor
Exhaust
Thermistor 2
Exhaust
Thermistor 1
Heating Supply
Thermistor
Graphic Panel
Communication
Interface
PWM
SMPS
Primary
Secondary
Dip Switch
Zone1 Thermostat
Zone2 Thermostat
R,W,C
Air Handler
Output
LWCO
R,W,C
DHW Priority
Flame Rod
Linear
Trans
AC 24V
AC INPUT(AC 120V)
Terminal Board
3.15A
Auto
AC Gas Valve
(NFB-399C)
Boiler State
Boiler Error
Relay 4
Boiler Pump
Relay 1
10A
10A
10A
10A
ZONE1 Pump
Relay 3
ZONE3 Pump
Relay 2
ZONE2 Pump
EMI
FILTER
WD-PSS
Relay coil
1~11
H.T.L(BH)
VDC Output
VDC Input
Relay 8
Output
Relay 9
Output
Relay 10
Output
Relay 11
Heating Return
Thermistor
System Return
Thermistor
DHW Tank
Thermistor
System Supply
Thermistor
Outdoor
Thermistor
1 2 3 4 5 6
O
N
O
N
1 2 3 4 5 6 7 8
Zone3 Thermostat
Zone4 Thermostat(DHW)
Manual
Flow Switch
R,W,C
R,W,C
APS
MCU 1 MCU 2
Terminal Board
DC Gas Valve
(NFB-301C)
LIVE NEUTRAL
AC INPUT(AC 120 V)