Worcester ZWBR 7-30 R 30 HE PLUS COMBI Service Booklet page 12

Boiler service functions
4.6 Internal regulator
The boiler has an internal anti-cycle function which pre-
vents the burner overheating if the heat output can not
be dissipated even in Min mode. The appliance will then
switch off even when the system is calling for heat.
It will subsequently switch on again
• after 5 seconds in hot water mode,
• after 30 seconds in DHW cylinder charging mode,
• after between 25 and 60 minutes (depending on the
setting of Service Function 6.8 Cycle time (hot
water)) in response to a call for heat for maintaining
cylinder temperature,
• after 0 to 15 minutes in heating mode (depending on
the setting for service function 2.4 Anti-cycle
mode).
The anti-cycle function is cancelled by another demand
for heat.
If the anti-cycle function is to be switched off manually:
B switching the appliance off and on again at the mas-
ter switch.
B activating Min or Max mode.
B briefly switching to summer mode on the tempera-
ture control for CH flow
5.0 Max. output (heating)
The heating output can be set to any level between min.
rated heat output and max rated heat output to limit it to
the specific heat requirements.
Even if the heating output is limited, the
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full rated heat output remains available for
hot water or DHW cylinder charging.
The factory setting is maximum rated output – display
shows „100 %" .
5.1 Permanent ignition
This function allows permanent ignition without gas
supply to be activated for the purposes of checking the
ignition mechanism.
Do not run for more than 2 minutes!
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5.2 GFA status/error
(not applicable)
5.5 Min. output
(not applicable)
6.0 Starting load
The start speed of the combustion air fan can be
increased, where problems with excessive flue lengths
may interfere with ignition. Areas with variable wind
conditions may also benefit from this facility.
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.
6.6 Thermostore satisfied
(not applicable)
6.7 Pump off (hot water)
(not applicable)
6.8 Cycle time (hot water) (combi only)
The appliance is supplied with the pre-heat cycle time
set to 20 minutes.
After pre-heating or a DHW demand, this function will
stipulate the period of time before the next permissible
pre-heat. This will prevent excessive pre-heat cycling.
6.9 Duration (hot water) (combi/system)
The appliance is supplied with the hot water duration
set to 1 minute.
The hot water duration specifies how long after hot
water is drawn heating mode remains disabled.
7.0 Pump map (heating)
The appliance is supplied with this function set to 3
Const. pressure low (see pump characteristics
below).
The pump map indicates how the pump is controlled in
heating mode. The pump switches between the various
pump speeds so as to reproduce the characteristic
curve selected.
Changing the pump characteristic can be helpful if a
lower pressure difference will guarantee the necessary
circulation on the basis of the system dimensions and
pump characteristic.
In order to save as much energy as possi-
i
ble and to minimise the possibility of water
circulation noise, a low characteristic
should be chosen.
The pump map can be selected within:
• 0 Pump step adjustable, see service function
7.1 Map pump step (heat.)
• 1 Const. pressure high
• 2 Const. pressure middle
• 3 3 3 3 Const. pressure low
• 4 Prop. pressure high
• 5 Prop. pressure low.
7 181 465 347 (05.01)