Installation Instructions

Gas supply adjustments (Commissioning Part II) 7

Instructions for installation and servicing aquaPLUS VUI 362-7 27

7.4 Adjusting the ignition rate

• Undo screw and remove the cap (1).

• Disconnect the modulating coil wires from the gas

valve, set the DHW temperature control to maximum

and fire the boiler at full rate by fully opening a hot

water tap.

• 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, P2, P3, P11, P12 and P13". Release "+"

button.

• Press "+" button until "P2" (ignition rate) is shown in

display.

• Press "i" button to operate boiler at full gas rate.

• Use a suitably sized screwdriver to turn the inner

screw (2).

-Turn the screw (2) clockwise to increase the ignation

rate

- Turn the screw (2) anticlockwise to decrease the

ignation rate

• Adjust the burner pressure until it matches the

ignition rate in table 7.7, page 30.

• Turn off the hot water tap and reconnect the wires to

the modulating regulator.

• To cancel selected "P1" or "P2" mode press the "i" and

"+" buttons simultaneously.

Warning!

The main burner pressure must be rechecked

after adjusting the ignition rate.

Refit cap (1) 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.

Fig. 7.4: Adjusting the ignition gas quantity