Navien NHB-150 Service Manual

NHB Service Manual 63
Version 1.0
4.8 Electrical Diagnostic Point & Wiring Diagram
Color Code
B O R W Y BK BR GY
: Blue : Orange : Red : White : Yellow : Black : Brown : Green/Yellow
If any of the original wires as supplied the boiler must be replaced, they must be replaced their equivalent.
FM
Fan Motor
Y BKR
O
W
CN8
CN17
IG
Spark
Electrode
Flame rod
BR
B
BK
BK
Neutral(W)
Hot(BK)
Ground (GY)
GY
Power Code
W
Fuse (10A)
GY
Ground
CON1
BK BK
Front Panel
BK BKBK BKBK BKBKBKBKBK
CN13
B B
Exhaust 1 Thermistor
B B
B B
Return Thermistor
B B
B B
Supply Thermistor
B B
BK BK
High Limit S/W
CN1
CN26
CN19
GY
M
CN15
Dual Venturi
BRW B
MGV
Main Gas Valve
W Y R
CN16
CN10 CN12 CN24 CN25
P : Purple
LWCO
CN11
B
Outdoor Thermostat
B
CN22
Water Pressure
R
GY
BK
Sensor
WPS
CN6
APS
R
W
BK
Air Pressure Sensor
A
B
D
E
F
G
H
I
J
K
CN18CN28
AC24V Output
System Supply Temp.
System Return Temp.
System
Pump
Boiler Pump
DHW Pump
CN29 CN30
CN27
CN23
T/T CH
T/T
DHW
DHW
A/H
(max 2A) (max 2A) (max 2A)

Navien NHB-150 Specifications

General

Model	NHB-150
Category	Boiler
Maximum Input	150, 000 BTU/h
AFUE	95%
Vent Type	Direct Vent
Fuel Type	Natural Gas or Propane
Min. Input (NG)	15, 000 BTU/h
Min. Input (LP)	15, 000 BTU/h
Voltage	120 V
Water Connection Size	1 inch NPT
Gas Connection Size	3/4 inch NPT
Vent Diameter	3"