Ladder Diagram - Navien NPE Installation & Operation Manual

7.4 Ladder Diagram

Primary
Secondary
HOT NEUTRAL
Relay 1
EMI
FILTER
Relay 2
Relay 3
Relay 4
PWM
Primary
SMPS
DC15V
DC24V
DC12V
DC5V
Flow Sensor
APS
Fan
Hall Sensor
Outlet
Thermistor 1
Outlet
MCU 1
Thermistor 2
Inlet
Thermistor 1
Inlet
Thermistor 2
Exhaust
Thermistor
[NPE-180A/ 210A/ 240A]
EXT_PUMP
VENTURI
IGNITER
PUMP
FAN
Speed Control
Water Adjust
FSA Power
Valve
Switch
Flow Control
H.T.L
WD-PSS
Driving Circuit
Relay 3
MGV1
MGV2
Relay 1
Relay 2
Relay 4
Communication
Interface
UART
FRONT
Communication
PANEL
Interface
Ready Link
Ready Link
Interface
200V
Flame Rod
MCU 2
Appendixes 81