Pump Map (Heating) (Not Zbr...); Map Pump Step (Heat.) (Not Zbr...); Output Reduction; Antiblock. Map Pump (Not Zbr...) - Worcester ZSBR 7-28 ICS1 Service Booklet

Boiler service functions
If a stratified-charge tank is connected, it is useful to
have the function activated.
The delayed cut-in of the pump then prevents cold
water being pumped through the tank and cooling it
down.
6.8 Cycle time (hot water) (ZWBR... only)
The appliance is supplied with the hot water cycle time
set to 3 minutes.
The hot water cycle time specifies how long after hot
water is drawn the pump continues to pump water
through the internal hot water system.
6.9 Duration (hot water) (ZWBR... only)
The appliance is supplied with the hot water duration
set to 3 minutes.
The hot water duration specifies how long after hot
water is drawn heating mode remains disabled.

7.0 Pump map (heating) (not ZBR...)

The appliance is supplied with this function set to
"4 Prop. pressure high"(see pump characteristic in
boiler installation instructions).
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. (The current setting can be viewed by
means of service function 7.4.)
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 (see installation instructions).
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.
If this parameter is set to "0 Pump step adjustable", then
the pump speed set under function 7.1 is active.

7.1 Map pump step (heat.) (not ZBR...)

The appliance is supplied with this function set to 1 (see
pump characteristic in boiler installation instructions).
However, the setting is only active if function 7.0, Pump
map (heating), is set to "0 Pump step adjustable".
This service function corresponds to the pump speed
switch used on conventional heating pumps.
12

7.2 Antiblock. map pump (not ZBR...)

The appliance is supplied with this function activated.
If the pump threatens to jam, an oscillating pump action
is activated. Afterwards, the required operating mode is
continued.
7.3 Aeration mode (not ZBR...)
The first time the appliance is switched on, a once-only
venting function is activated. The heating pump then
switches on and off at intervals. This sequence lasts
about 8 minutes and the text display shows "Aeration
mode". The 2-digit display shows "
the CH flow temperature. The automatic vent must be
opened and then closed again once the venting
sequence is complete.
The venting function can be activated
i
manually after servicing.
• If the venting function is set to "On, autom. deacti-
vat.", once the sequence has been completed.
7.4 Actual map pump step (not ZBR...)
The currently active pump speed is displayed (see func-
tion 7.0).
7.5 Map pump load index (not ZBR...)
The load index is displayed.
7.6 Map pump type (not ZBR...)
The pump type code of the pump fitted is displayed.

7.7 Output reduction

The appliance is supplied with this function activated. It
prevents overload of the heat exchanger with high CH
flow temperatures.
The output of the burner is reduced according to the
CH flow temperature, i.e. up to 80 °C flow temperature,
full burner output is permitted. Above 80 °C, the burner
output is reduced as flow temperature increases up to
90 °C at which only minimum output is available (even
with maximum heat demand).
This function can be deactivated for hot water and/or
central heating mode.
o
" in alternation with
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7 181 465 347 (01.07)