Technical data

Before starting the adjustment, dismount the front panel.

ATTENTION! Manometer is fixed to the front panel. Dismount the front

panel, as it is stated below: Loosen the two screws, under the panel. Pull

the panel slightly and loosen the nut. Take out the manometer from the

panel. By pushing the front panel upwards, it can be easily taken apart.

Loosen the screw that fixes the control box, then swing the control box to

left and allow the boiler to run for approximately five minutes to stabilize

before making the final adjustments to the gas pressure settings. To be

able to do the adjustments, the system should call for full heat input.

Refer to Figs. 26 and 27 for following steps.

7.4 Maximum and Minimum DHW/CH Input Adjustments

(mechanical maximum and minimum)

• Loosenthescrewofgasvalveoutletpressuretestpoint(1)andcon-

nect a U-manometer to it.

• Takeapartthemodulationcablesfrommodulationterminals(5).

• Remove yellow cap (2) to expose pressure regulator adjustment

screws (3; 4).

HARMONY_D USERS INSTALLATION AND SERVICE MANUAL

Figure 26 Gas Modulator

7.4 Maximum and Minimum DHW/CH Input Adjustments (mechanical

maximum and minimum)

 Loosen the screw of gas valve outlet pressure test point (1) and connect a U-

manometer to it.

 Take apart the modulation cables from modulation terminals (5).

 Remove yellow cap (2) to expose pressure regulator adjustment screws (3; 4).

 Turn the red pressure regulator adjustment screw (3) clockwise up to its end position.

 Set the maximum pressure to the desired value by rotating the pressure regulator

adjustment screw (4) with a 10 mm spanner. Turning clockwise increases and anti-

clockwise reduces the pressure.

 Set the minimum pressure to the desired value by rotating the red minimum pressure

adjustment screw (3). Turning clockwise increases and anti-clockwise reduces the

pressure.

 Replace yellow pressure regulator cap (2) and the modulation cables.

NOTE: For I3+ category adjusted appliances, where adjustment of the maximum pressure is

not allowed and gas supply pressures do not exceed 29 mbar for G30 (butane) and 37 mbar

for G31 (propane), set the maximum pressure regulator adjustment screw to its maximum

position, then set the minimum pressure regulator adjustment screw as above.

ATTENTION! To disable unauthorized persons’ interference, the yellow cap on the gas

valve should be painted with a red paint to seal it.