117
Appendixes
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)
Summary of Contents for NHB Series
Page 120: ...120 Appendixes 12 6 Component Assembly Diagrams and Part Lists 12 6 1 Case Assembly NFB 301C...
Page 122: ...122 Appendixes 12 6 2 Case Assembly NFB 399C...
Page 124: ...124 Appendixes 12 6 3 Heat Exchanger and Waterway Assembly NFB 301C...
Page 126: ...126 Appendixes 12 6 4 Heat Exchanger and Waterway Assembly NFB 399C...
Page 128: ...128 Appendixes 12 6 5 Combustion Parts Assembly NFB 301C...
Page 131: ...131 Appendixes 12 6 6 Combustion Parts Assembly NFB 399C...
Page 134: ...Memo...