Setting The Dip Switches; Pcb Dip Switches; Front Panel Dip Switches - Navien NCB-20LHWE Installation & Operation Manual

7. Setting the DIP Switches

CAUTION
Do not remove the front cover unless the power to the
boiler is turned o 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 1 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.

7.1 PCB DIP Switches

Dip Switch 1 (Set of 8)
The DIP SW 1 on the circuit board con gures operation status,
boiler model/capacity, burner type, and country.
Dip SW 1
ON
1 2 3 4
Switch Function Setting
Normal Operation
20/23/28
LHWE
Operation 33LHWE
1 & 2
Status
20/23/28
LHWE
33LHWE
20LHWE
23LHWE
3 & 4 Capacity
28LHWE
33LHWE
Burner
5 Bekaert
Type
6 & 7 Country Europe
Combi
Boiler
8
Type
System
34 Setting the DIP Switches
Dip SW 2
ON
5 6 7 8
1 2 3 4
1-OFF, 2-OFF
MIN
1-OFF, 2-ON
1-stage MIN
Heating MAX
1-ON, 2-ON
Heating
2-stage MAX
3-OFF, 4-OFF
3-ON, 4-OFF
3-OFF, 4-ON
3-ON, 4-ON
5-OFF
6-OFF, 7-OFF
8-OFF
8-ON
Dip Switch 2 (Set of 4)
The DIP SW 2 on the circuit board con gures the external DHW
tank.
Switch Function Setting
Used
1 DHW Tank
Unused

7.2 Front Panel DIP Switches

Dip Switch (Set of 8)
The DIP SW on the front panel con gures the fuel selection,
source of the heat demand, and temperature control standard.
1 2 3
O
N
Switch Function Setting
G20 (LNG)
G25, G27(LNG)
Fuel
1 & 2
Selection
G30 (LPG)
G31 (LPG)
Panel
OpenTherm
Remote Control
Heat
4 & 5
Room Stat
Demand
230 VAC Room
Stat (System boiler
only)
Temperature Supply Water
6 Control
Return Water
Standard
1-ON
1-OFF
4 5 6 7 8
1-OFF, 2-OFF
1-OFF, 2-ON
1-ON, 2-OFF
1-ON, 2-ON
4-OFF, 5-OFF
4-ON, 5-OFF
4-OFF, 5-ON
4-ON, 5-ON
6-OFF
6-ON