Setting The Domestic Hot Water Temperature And Flow Rate; Domestic Hot Water Temperature; Hot Water Flow Rate; Summer Mode (Hot Water Only) - Worcester ZWBR 7-28 HE plus Installation And Servicing Instructions

5.5 Setting the domestic hot water
temperature and flow rate
5.5.1

Domestic hot water temperature

The hot water temperature can be set to between
approx. 40 °C and 60 °C.
This temperature is not shown on the display.
6 720 610 333-07.1O
Fig. 32
Setting
Turn fully anti-clock-
wise
l
Turn fully clockwise
Table 10
"ECO" button
By pressing and holding the "ECO" button
display lights, you can switch between Comfort mode
and Economy mode.
Comfort mode: button is not lit (factory setting)
The appliance is held constantly at the set temperature.
This means that hot water is available almost instantane-
ously at the tap. Consequently the appliance will switch
on at intervals, even if no hot water is being drawn.
ECO mode with demand detection, button is lit
The demand detection function enables maximum gas
and water economy.
Briefly turning a hot water tap on and then off again sig-
nals demand to the appliance which then heats up the
water to the set temperature.
Hot water is thus available in about 1 minute.
ECO mode, button is lit
Water is not heated up until hot water is drawn. This
means that there is a longer waiting period before hot
water is available.
5.5.2

Hot water flow rate

The flow rate is factory set to 8 l/min.
Under standard conditions (2 bar) supply pressure, one
full turn is equivalent to approximately 2 l/min.
6 720 610 597 GB (01.07)
Hot Water temperature
approx. 40 °C
approx. 55 °C
approx. 60 °C
, until the
y To increase the flow rate (max. 14 l/min):
turn screw on flow switch anti-clockwise (+).
The outlet temperature will decrease relative to the
increase in the flow rate.
y To reduce the flow rate (min. 8 l/min):
turn screw on flow switch clockwise (–).
The outlet temperature will increase relative to the
decrease in the flow rate.
Fig. 33
5.6

Summer mode (hot water only)

With room thermostat
y Turn temperature control
clockwise as far as the stop.
The central heating is now turned off. The hot water
function and the mains power supply for the heating
programmer and timer remain switched on.
5.7

Frost protection

y Leave master switch switched on.
Frost protection and constant frost pro-
i
tection modes can be set on the text dis-
play module.
If the appliance is to be left for long periods switch the
central heating off:
y Add a suitable anti-freeze fluid to the water in the
central heating system.
Suitable products are available from Betz-Dearborn
Tel.: 0151 4209563 and Fernox Tel.: 01799
550811.
5.8

Pump anti-seize function

This function prevents the central heating
i
pump seizing after long periods of inactivity.
Every time the pump is switched off, a timer is started.
If after 24 hours the pump has not run again, it is
switched on for a period of 5 minutes.
Commissioning
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on the appliance anti-
25