Ladder Diagram - Navien NFC-175 Installation & Operation Manual

12.3 Ladder Diagram

Linear
Trans
AC 24V
AC INPUT(AC 120VAC)
HOT NEUTRAL
EMI
FILTER
PWM
Primary
Primary
SMPS
Secondary
DC5V
WPS
APS
Fan
Hall Sensor
Exhaust
Thermistor 1
MIXING
Thermistor
Heating Supp ly
Thermistor
Heating Retur n
Thermistor
System Supp ly
Thermistor
System Re tur n
Thermistor
Outdoo r
Thermistor
INLET
Thermistor
Dip Switch
Dip Switch
LWCO
CH/Zone1
Thermostat
Zone2
Thermostat
Zone3
Thermostat
External R/C
Thermostat
MIXING
VALVE1
MIXING
VALVE2
FLOW
SENSOR
AWS_VALVE
3WAY
VALVE
10A
10A
10A
10A
Relay 5
Relay 6
Relay 7
FAN
Speed Control
DC15V
DC24V
DC12V
H.T.L_1
WD-PSS
H.T.L_2
MCU 1
Communication
Interface
UART
Communication
Interface
CASCADE
(RS-485)
Air Handler
DHW Priority
Terminal Board
Relay 1
R/C Pump
Relay 2
Boiler Pump
Relay 3
Zone1 Pump
Relay 4
Zone2 Pump
Relay 5
Zone3 Pump
Dual Venturi
Igniter
3WAY VALVE
Flame Rod
MGV1
MGV2
Relay 1
Relay 2
Relay 3
Relay 4
MCU 2
Relay 5
Relay 6
Relay 7
Relay 8
Relay 9
Relay 10
FRONT
PANEL
Terminal Board
Relay 7
Output
Relay 8
Output
Appendixes 111