Bosch Appliances 24I RSF manual Programmer, Appliance Operation, Completion of Commissioning

12.3 PROGRAMMER

Any programmer fitted on the appliance should be set up at this stage following the instructions sent with the programmer.

12.4 APPLIANCE OPERATION

Turn off the gas and electricity supplies to the appliance. Undo the two screws and hinge down the facia.

Loosen the burner pressure test point screw and connect a pressure gauge. See Fig. 27.

Fig. 27. Gas valve.

Inlet pressure test point

Electrical connections Ð modulator (Blue : Blue)

Modulating solenoid

Domestic Hot Water.

Set any Programmer to HEATING & WATER. Turn on the gas and electricity supplies.

Set the Central Heating temperature control knob to Off.

A tap should be opened to create a hot water demand then a continuous ignition spark will occur until the burner is alight and sensed by the control circuit. The burner will light and remain at its maximum setting. The burner pressure should be between

13.4and 13.8 mbar on Natural gas (33.0 and 35.0 mbar on Propane). If the burner pressure is low, check that the supply pressure at the gas valve inlet is at least 19 mbar for Natural gas (37 mbar for Propane).

Test for gas soundness at the joint between the burner and the gas valve with leak detection fluid.

Note: The burner pressure is factory set and if (after checking that the supply pressure is sufficient) the correct pressure is not obtained then Worcester Heat Systems Service Department should be contacted.

Gradually close the hot tap and check that the burner pressure drops. Fully open the tap and check that the burner pressure rises. Fully close the tap and check that the burner goes off. The fan may continue running until the appliance has cooled.

Central Heating

Check that all the radiator valves are open.

Check that the system is pressurised and set to the required pressure as indicated on the gauge.

Set any Programmer to HEATING & WATER. Turn on the gas and electricity supplies.

Set the room thermostat and the Central Heating Temperature Control to maximum.

The burner will light.

The appliance will modulate its output between 7.5 and 23.4 kW over a period of about twenty minutes.

Check the system to ensure that all the radiators are heating up evenly.

Shut down all but one of the radiators and observe the burner pressure fall. Open all of the radiator valves and check that the burner pressure rises.

Balance the system so that the required temperature difference across the central heating flow and return pipes is obtained. See Table 3, Section 3 Data Tables.

Set the room thermostat to minimum and check that the burner goes out. Reset the room thermostat to maximum and the burner will re-light after a short anti-cycle delay and follow the normal operating procedure.

Check for proper ignition of the burner after a break in the gas supply. Turn off the gas service cock and wait for 60 seconds. The burner will go out but sparking from the electrode will continue for 10 seconds when the appliance will enter a ÒlockoutÓ state. Carefully open the gas service cock, interrupt the mains power supply to the appliance for a few seconds to reset the controls and observe the burner re-light and follow the normal sequence of operation.

Turn off the gas service cock and the electrical supply to the appliance.

Drain the system while the appliance is still hot.

Refill, vent and re-pressurise as described in Section 12.2. Domestic Hot Water and Central Heating

Turn on the electricity supply to the appliance and open the gas supply cock at the appliance.

Set the Central Heating temperature control knob to demand and any programmer to HEATING & WATER. If a programmer is fitted, set the domestic hot water to Continuous or 24 Hrs and the central heating to ON. The burner will light and heat will pass into the system. Turn on a hot water tap and check that after a short delay fully heated hot water is discharged from the tap.

Close the tap and the burner will go off. After a short time the appliance will then return to the central heating mode and automatically balance with the system requirements.

Set the Central Heating Temperature Control Knob to OFF and the burner will go out.

12.5 COMPLETION OF COMMISSIONING

Disconnect the pressure gauge and tighten the test point screw. Restart the appliance and check for gas soundness around the test point screw.

Refit the cabinet front panel.

If the appliance is being passed over to the user immediately, refer to Section 13 - Instructions to the User and set the controls to the users requirements.

If the appliance is to be left inoperative, check that the Central Heating Temperature Control is set to OFF. Turn off the gas service cock and switch off the electricity supply.

If there is any possibility of the appliance and system being left inoperative during frosty conditions, drain the appliance and system. If the premises are to be left unoccupied during frosty conditions, then drain the appliance and system. For short inoperative periods, leave the appliance under the control of the built in frost thermostat or the remote frost thermostat (if fitted) or leave operating continuously with the room thermostat set at 6¡C.