Constant Hot Water Cycle Time (Service Function 6.8); Setting The Gas/Air Ratio - Worcester benchmark ZWB 7-25 R 25 HE Design, Installation And Servicing Instructions

B Press and hold the
ously until the display shows = =.
The and buttons will light up.
Fig. 38
B Turn the temperature control
shows 5.0.
After a short delay, the display then shows the set
heating output in percent.
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Fig. 39
B Refer to the settings tables for heating and cylinder
charging output to obtain the relevant code for the
desired heating output in kW (see page 45).
B Turn the temperature control
shows the desired code number.
The display and the
B Measure the gas flow rate and compare with the fig-
ures specified for the code number displayed. If fig-
ures do not match, adjust the code number!
B Press and hold the
ously until the display shows [ ].
The heating output is now stored.
Fig. 40
B Return the temperature controls
original positions.
The display will revert to the CH flow temperate.
6.2.6 Constant hot water cycle time
(Service Function 6.8)
In Comfort mode "ECO light off" , the hot water inside
the appliance is held constantly at the set temperature.
For that reason, the appliance switches on if the water
temperature falls below a certain temperature. In order
to prevent it switching on and off too frequently, the
constant hot water cycle time service function allows
6 720 611 441 GB (03.11)
and buttons simultane-
6 720 610 332-50.1O
until the display
until the display
and buttons will flash.
and buttons simultane-
6 720 610 332-52.1O
and to their
you to set the minimum period between switching off
and on again. This function has no effect on normal
demand for hot water and relates only to the constant
hot water function in Comfort mode.
The cycle time can be set to any period between 20 and
60 minutes (is factory set to 20 minutes).
6.3

Setting the gas/air ratio

The appliance is set at the factory and adjustment to the
CO settings (gas/air ratio) is only required where the
2
appliance has been stripped down and assembled or if
the fan, burner or gas valve are replaced or the appli-
ance has been converted to a different gas type, see
section 7.
Individual settings
29