Technical data

• TurntheDHWknobtoadesiredtemperaturepositionandopena

water tap fully and check that the boiler lights and operates.

7.3 Setting the Heat Input

The heat inputs for CENTRAL HEATING (CH) and DOMESTIC HOT

WATER (DHW) are already set on the boiler when supplied from the

factory. The default input settings for minimum and maximum rates for

both CH and DHW circuits are the nominal input rates of the boiler given

in Table1.

The diagrams in Fig. 26 show the correlation between gas pressure and

heat input for all possible gases. The pressure to achieve a desired po-

wer output can be found via this diagram. Then the pressure, which can

be observed from the U-manometer connected to the gas valve, will be

adjusted as described below. In order to calculate the heat output of the

appliance for a certain pressure level, multiply the corresponding input

rate value by the efficiency. To convert the unit kW to kcal/h, multiply the

value by 860.

ATTENTION! Maximum heat inputs should not exceed the given limits.

HARMONY_D USERS INSTALLATION AND SERVICE MANUAL

Figure 25 Burner Pressure/ Heat Input Diagram

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.

Natural Gas (G20)

10 12 14 16 18 20 22 24 26 28

Heat Load (kW)

Burner Pressure (mbar)