44 Installing the System Piping
When connecting the DHW Tank Sensor
The Navien Universal Temperature sensor can be used as a DHW Tank Sensor. When installing the Universal
Temperature sensor to the boiler, follow these guidelines:
●
This sensor is compatible for use with aquastat immersion wells. Attach an aquastat immersion well to the
DHW tank before installing the sensor.
●
When installing the sensor to the tank, verify that the sensor is completely inserted into the immersion well.
●
Install the included clip on the groove on the immersion well as shown in the illustration.
●
Insert the wire through the available eyelet on the clip then wrap it around the clip once to fix the sensor to
the well.
●
Complete the installation by connecting the wires to the DHW Tank terminals located on the PCB.
Note
When inserting the sensor into the immersion well, heat conductive paste can be used to improve
thermal transfer between the two components.
Installing the DHW Tank Sensor
R
W
C
R
W
C
Boiler Pump FUSE
(250VAC_10A)
ZONE3 Pump FUSE
(250VAC_10A)
ZONE2 Pump FUSE
(250VAC_10A)
ZONE1 Pump FUSE
(250VAC_10A)
CNP1
CNP2
CNA1
CNX1
IN
OUT
N
L
DHW
PRI
R
W
C
R
W
C
CNG1
CNF1
CNK1
ZONE3
ZONE2
ZONE1
DHW
CNT1
CNT2
CNT3
CNT4
SUPPLY
RETURN
OUTDOOR
DHW
TANK
CNJ1
CND1
CNV3
CNV2
CNV1
CNC3
ZONE3
LWCO
ZONE2
ZONE1
CNC4
CNC5
CNC6
CNC1
CNC2
R
W
C
R
W
C
R
W
C
R
W
C
<NHB-H>
Boiler
Pump
(max. 2.5 A)
System
Pump
(max. 2.5 A)
DHW
Pump
(max. 2.5 A)
Pump Ground
Live
Live
Live
Neutral
Neutral
NOTICE
Use only the Navien Universal Temperature sensor (#GXXX001769). The use of other sensors may result in
higher water temperatures than expected.
