Main Burner Pressure; Adjusting The Central Heating Output (Range Rating) - Vaillant 824/2 E Instructions For Installation Manual

7.2 Main burner pressure

The burner pressure on this appliance has been factory
set and does not require adjustment. To check the main
burner pressure connect the U-Gauge as follows
depending on the gas type.
• Remove front case and combustion chamber cover.
Note!
All measurements and adjustments to the gas
valve must be done with the combustion
chamber cover removed.
For natural gas appliances:
• Slacken the sealing screw (1) at test point on the gas
valve and attach one arm of a U-gauge (2) to the test
point.
For LPG appliances:
• Slacken the sealing screw (1a) at test point on the
burner inlet gas pipe and attach one arm of a U-gauge
(2a) to the test point.
Connection for Natural gas
1
Connection for LPG
Fig. 7.2
Instructions for Installation and Servicing turboMAX plus and thermoCOMPACT R1
Supplied By www.heating spares.co Tel. 0161 620 6677
Gas supply adjustments (Commissioning Part II) 7
2
1a
2a
• Turn off the boiler at the main ON/OFF control.
• Press and hold the "+" button, while pressing the
button turn the main ON/OFF control to the "1" ON
position.
• Continue holding "+" button until display alternates
between "P1" and "P2". Release "+" button.
• Press "+" button until "P1" is shown in the display. "P1"
indicates the maximum gas rate and "P2" indicates
the ignition rate.
• Press "i" button to operate boiler at maximum gas
rate.
Check that the burner pressure is correct as shown in
table 7.1 for the appropriate boiler. To cancel selected
"P1" or "P2" mode press the "i" and "+" buttons
simultaneously.
turboMAX plus only
Measure the domestic hot water burner operating
pressure (mbar), the heat input (kW), the inlet/outlet
domestic hot water temperatures (°C) and flow rate
(l/min) by fully opening a hot water tap and record
details in the boiler logbook.
thermoCOMPACT only
Record the heat input in the boiler logbook.
After completion of all tests tighten sealing screw,
and check all test points for soundness (1/1a).
7.3 Adjusting the central heating output
(range rating)
The boilers are fully modulating for central heating, and
it is therefore not necessary to range rate the boiler.
However, if desired, it is possible to range rate the boiler,
as follows:
• Connect the U-gauge to check burner pressure.
• Use Table 7.1 (page 31-32) on to determine the central
heating output required.
• Note the burner pressure setting.
• Turn on the central heating.
• Ensure that any thermostatic radiator valves are open
and set to high.
• Simultaneously press and release the "+" and "-"
buttons to activate burner pressure mode.
• The boiler will light at the factory set nominal gas rate.
Attention!
DO NOT open any hot water tap while carrying
out this procedure (turboMAX plus only).
• Check that the U-gauge reading corresponds to the
maximum burner pressure as detailed on the table.
• Identify required range rating setting and note main
burner pressure in mbar for that output.
• Adjust central heating output range as shown on page
29.
27