Bosch Appliances 28i junior manual Commissioning, The Combustion For The Appliance Is Factory Set

COMMISSIONING

33

A

D

F

C

Inlet Test Nipple

NOTE: When running in the service mode, the boiler will operate both the central heating and the domestic hot water circuits. This is to allow sufficient time for this part of the commissioning procedure. It will be necessary to run water through the domestic hot water circuit to ensure that the boiler will not cycle on low heating demands.

I

H

E

G

B

A - On/off button

B - On/off and fault indicator (BLUE) C - Central heating temperature control D - Burner indicator (GREEN)

E - Reset button

F - Service button

G - ECO button

H - System pressure gauge

I - Cover or optional programmer

COMMISSIONING

THE COMBUSTION FOR THE APPLIANCE IS FACTORY SET.

NO ADJUSTMENT IS REQUIRED IF THE GAS INLET PRESSURE IS CORRECT.

CHECKING GAS INLET PRESSURE:

The inlet pressure to the appliance must be checked using the following procedure:

SETTING THE BOILER TO MAXIMUM:

1Press service button (F) for 10 seconds and set Central Heating temperature to maximum.

•The service button will illuminate continually and the blue power indicator will flash quickly.

MEASURING THE INLET PRESSURE:

2Slacken the screw in the inlet pressure test point and connect a manometer.

Measure the pressure with the boiler running at maximum.

Check the gas supply working pressure at the gas valve inlet point is not less than: N.G. 18.5 mbar

L.P.G. 37 mbar

The gas rate should be measured at the gas meter after 10 minutes operation at maximum. See technical data section at the front of this manual.

Ensure inlet pressure is satisfactory with all other gas appliances working.

Replace controls cover. NOTE: This boiler is designed with a differential of 20°C across the heating system.

If pressure is satisfactory press the

IMPORTANT: Do not continue commissioning until the correct gas pressure is achieved.

service button (F) again and the boiler will return to normal operation.

•If left in the service mode the control will return to normal operation after 15 minutes. Re-seal the screw in the gas inlet pressure test point.

DOMESTIC HOT WATER:

Controlling the hot water temperature The hot water temperature is fixed at 55°C.

DOMESTIC HOT WATER PRE-HEAT: Pre-heat reduces the time taken to produce hot water at the tap and is controlled by the ECO button (H).

Press the ECO button to select either:

When the ECO button is not illuminated the boiler will be in pre-heat mode (which will reduce the time taken to produce hot water at the tap).

OR

When the ECO button is illuminated the boiler will be in economy mode with pre-heat no longer active.

COMMISSIONING

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 24 i junior/28 i junior 8 716 107 336b (11/05)