Checking The Gas Rate; Domestic Hot Water; Domestic Hot Water Pre-Heat - Worcester 29CDi Classic Installation, Commissioning And Servicing Instructions

5.5.2

CHECKING THE GAS RATE

▶ 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.
– Press the Performance test button (J) for more than ten seconds
and set Central Heating temperature to maximum.
– The Performance test button (J) will illuminate continually and
the display (C) will alternate between
heating flow temperature.
▶ Where a gas meter is not available (e.g. L.P.G.) the CO/CO
checked to the units shown in the setting of the air/gas ratio, refer to
section 6.2.
▶ If pressure and gas rate are satisfactory press the Performance test
button again and the boiler will return to normal operation.
– If left in the Performance test mode the control will return to
normal operation after 15 minutes.
▶ Close the gas isolation valve.
▶ Remove the manometer.
▶ Re-seal the screw in the gas inlet pressure test point.
▶ Open the gas isolation valve.
▶ Ensure that there are no gas leaks.
▶ Replace the outer case.
5.5.3

DOMESTIC HOT WATER

Controlling the hot water temperature
▶ The hot water temperature can be set to between approximately
40°C and 60°C using the temperature control (H).
When a hot tap is turned on and only cold water is delivered, and the
boiler does not fire up, the first thing to check would be to see if the hot
and cold domestic water pipes are installed the correct way round, refer
to section 7.1, page 54.
5.5.4

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 (F).
▶ 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with pre-heat no longer active.
6 720 815 725 (2015/05)
and the central
must be
2
COMMISSIONING
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