Setting The Dip Switches; Pcb Dip Switches - Navien NCB-180 Installation & Operation Manual

6. Setting the DIP Switches

CAUTION
Do not remove the front cover unless the power to the
boiler is turned off or disconnected. Failure to do so may
result in electric shock.
The boiler has 2 sets of DIP switches on the main circuit board
(PCB) and 2 sets of DIP switches on the front panel. DIP switches
are used to control the functionality of the boiler. Set the DIP
switches appropriately, based on the installation environment.

6.1 PCB DIP Switches

Dip Switch 2 (Set of 8)
The DIP SW 2 on the circuit board configures additional features at
the time of installation, such as temperature control modes.
ON
1 2 3 4 5 6
Switch Function Setting
Return Water
Temperature
1
Control
Supply Water
Unused (Permanent
Thermostat
Space Heating
7 or Zone
Demand)
Controller
Used
Temperature Limit
Exhaust
Unused (CPVC)
8
Thermostat
Setting (PVC)
When PCB DIP switch 2 #8 is set to Off (factory
Note
●
default), the boiler does not operate without an
exhaust thermostat installed.
When you set PCB DIP switch 2 #8 to On, ensure
●
that CPVC piping is used for exhaust venting.
ON
1 2 3 4 5 6 7 8
1-ON
1-OFF
7-ON
7-OFF
8-ON
8-OFF
Setting the DIP Switches 43