Noritz WHiC56 Service Manual page 51

■ Burner Gas Pressure Adjustment
Note 1) Use the following procedure to adjust the burner gas pressure only
if it can be done with a high flow rate through the unit.
Note 2) When the burner gas pressure is adjusted, the front cover will be off.
Adjust the burner gas pressure to the value of "Cover Off" in the table
(because it is not possible to adjust the burner gas pressure with the
front cover on).
Note 3) Internal model only
Take the Intake Air and Exhaust Vent Pipes off the water heater when adjusting
the burner gas pressure.
Turn the DIP Switches (No.7, No.8) off when adjusting the burner gas pressure.
(DIP Switches No.7 and No.8 : For Vent Length Adjustment)
1. With a manometer or pressure gauge connected to the burner gas
pressure tap, press and hold the "Maximum Burner Gas Pressure
Set Button".
Use the "UP and DOWN Buttons" to adjust to the correct pressure.
2. Press and hold the "Minimum Burner Gas Pressure Set Button".
Use the "UP and DOWN Buttons" to adjust to the correct pressure.
3. Repeat steps (1) and (2) until both are at the correct pressure.
Burner Gas Pressures Maximum and Minimum Values
Model Name
WHi49
LWHi49
WHiX49
LWHiX49
WHiC56
LWHiC56
WHiCX56
LWHiCX56
* Burner gas pressure values are subject to change without prior notice.
Please check the latest burner specification table.
Burner Gas Pressure (mbar)
Gas type Supply Pressure
(mbar)
Max value
2H 20
3P 30/37
2H 20
3P 30/37
2H 20
3P 30/37
2H 20
3P 30/37
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Circuit Board
UP Button
DOWN Button
Minimum Burner Gas
Pressure Set Button
Maximum Burner Gas
Pressure Set Button
Front Cover Off
Min value
6.7 3.1
7.8 3.6
6.4 3.1
10.0 4.3
7.0 3.2
8.7 3.7
6.9 3.2
8.4 3.7
UP
DOWN
MIN
MAX