Navien Gas Water Heater Installation
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Step 3: Cable connection and DIP switch change
The water heater unit can be connected with other units up to 16 units using communication cables.
After choosing one of the units as the master unit, connect the cables and change the DIP switch 2
on the PCB as below. During step 1, the power supply should be OFF.
Cable connection and DIP switch set-up
-cascade communication cable PCB connecting adapter PCB CN9 port.
CN2
CN15
CN10
CN1
CN17
CN18
CN19
CN8
CN20
CN23
CN24
CN3
CN11
CN5
CN6
CN22
CN14
CN13
CN7
CN12
CN9
ON
ON
1
2
3
4
5
6
1
2
3
4
5
6
7
8
Min
Max
Modulating Gas
Valve Adjusting
Dip S/W 1
Dip S/W 2
Dip S/W 6
FND 1
SW4
(Service use)
SW3
(Not used)
1
2
4
3
1
2
4
3
ON
OFF
