Front Panel Dip Switches; Measuring The Incoming Gas Pressure - Navien NCB-24LSWE Service Manual

4.1.2 Front Panel DIP Switches

Setting the Front Panel DIP Switches
The DIP switch on the front panel configures the fuel
selection, source of the heat demand, and the temperature
control standard.
Switc Function
G20 (LNG)
G25, G27(LNG)
Fuel
1 & 2
selection
G30 (LPG)
G31 (LPG)
Panel
OpenTherm
Heat Remote Control
4 & 5
demand
Thermostat
Panel
Supply Water
Temperatu
re control
6
standard
Return Water
Version 1.0
Setting
1-OFF, 2-OFF
1-OFF, 2-ON
1-ON, 2-OFF
1-ON, 2-ON
2-OFF, 3-OFF
2-ON, 3-OFF
2-OFF, 3-ON
4-ON, 5-ON
1-OFF
1-ON
4.2 Measuring the Incoming Gas
Pressure
WARNING
The boiler does not function
correctly if there is insufficient
incoming gas pressure. Measuring
the inlet gas pressure should be
performed by a registered technician
only.
* The incoming gas pressure must be between 17 mbar and 25
mbar for natural gas and between 25 mbar and 35 mbar for
liquefied propane.
To measure the incoming gas pressure:
1. Shut off the manual gas valve on the gas supply line.
2. Open a hot water tap. The boiler should turn on and
the gas in the gas supply line will be purged.
3. Leave the faucet on until the boiler shuts down due
to the absence of gas, and then turn off the hot
water tap.
NCB Service Manual 21