Measuring The Inlet Gas Pressure - Navien NHB-055 Service Manual

Set of Front Panel DIP Switch 2 (2 switch unit)
The DIP SW 2 on the front panel configures settings for the type of
gas.
Before changing the settings, lift the rubber cover to access the
front panel DIP switches.
ON
1 2 3 4
Switch Function
2 Gas Type
NOTE
As for altimeter setting and fuel setting, reads and checks
●
DIP SW only at the time of initial power application and
clearance of DIP SW set errors and after the completion of
checking, even if DIP SW is changed, does not apply the
change of setting.
If Main-Panel communication is not made for more than 10
●
seconds at the point of judging DIP SW setting, it operates
judging as Default value, Sea Level (0~ 2,000ft), NG. Then, if
communication normally operates, panel's DIP SW setting
is not applied.
In order to change DIP SW setting, be sure to apply the
●
power of controller in the state that normal communication
with panel is possible.
Version 1.0
ON
5 6 7 8 9 10 1 2
NG LP
ON ON
2 2
Setting
Natural Gas 2-OFF
Propane Gas 2-ON

4.2 Measuring the Inlet Gas Pressure

WARNING
The boiler cannot function properly without sufficient inlet
gas pressure. Measuring the inlet gas pressure should be
performed by a licensed professional only.
The inlet gas pressure must be maintained between 3.5 in and
●
10.5 in WC for natural gas and between 8.0 in and 13.5 in WC for
liquefied propane.
The appliance and its individual shutoff valve must be
●
disconnected from the gas supply piping system during any
pressure testing of that system at test pressures in excess of
/ psi (3.5 kPa).
1
2
The appliance must be isolated from the gas supply piping
●
system by closing its individual manual shutoff valve during
any pressure testing of the gas supply piping system at test
pressures equal to or less than
To measure the inlet gas pressure:
1. Shut off the manual gas valve on the gas supply line.
/ psi (3.5 kPa).
1
2
Opened Closed
Gas Valve
NHB Service Manual 21