Setting Or Adjusting The Mid-Setting Point - Vaillant 824/2 E Instructions For Installation Manual

7 Gas supply adjustments (Commissioning Part II)
7.6 Checking the gas valve mid setting point
(turboMAX plus 837 and thermoCOMPACT 637
only)
To ensure the most efficient operation of the boiler a
gas valve mid setting point is necessary.
This mid setting point has been factory set and
adjustment of this point is only required after
exchanging either the electronic circuit board or gas
valve or converting the boiler to another gas type.
To check the mid setting point proceed as follows.
• 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 "I" ON
position.
• Continue holding "+" button until display starts to
alternate between the P numbers (P1, P2, P3, P11, P12
and P13).
Release "+" button.
• Press "+" button until "P3 " (mid setting point) is
shown in display.
• Press "i " button to operate boiler at mid setting
point.
• The burner pressure should now read the mid setting
point pressure for the gas type used, as detailed in
the table below.
Gas type Mid setting point presure
Natural Gas (G20) 5.3 mbar
LPG (G30/31) 15.3 mbar

7.7 Setting or adjusting the mid-setting point

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 "I" ON
position.
• Continue holding "+" button until display starts to
alternate between the P numbers (P1, P2, P3, P11, P12
and P13).
Release "+" button.
• Press "+" button until "P11" (for natural gas) or "P 13"
(for LPG) is shown in display.
• Press "i " button to operate boiler at mid setting
point.
• The mid setting point burner pressure is now adjusted
by pushing the "+" button until the gauge equals the
pressure as detailed in the table below.
Program No. Gas type
P.11 Natural Gas (G20)
P.12 Not applicable for GB -
P.13 LPG (G30/31)
30
Supplied By www.heating spares.co Tel. 0161 620 6677
When the pressure is correct, to save the setting to
memory, press and hold the "i" button until the display
stops flashing.
To cancel selected mode press the "i" and "+" buttons
simultaneously.
Refit cap and replace screw. Re-check ignition and main
burner pressures. After completion of these tests
tighten the sealing screw and check all joints and test
points for soundness.
Mid setting point
5.3 mbar
15.3 mbar
Instructions for Installation and Servicing turboMAX plus and thermoCOMPACT R1
Note!
The "-" button has no function in this mode, if
the required pressure is exceeded during set up,
this operation should be recommenced from the
beginning.