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Shows the status of channel 2 of the timer integrated in
the text display module or the separate programmer.
If that channel's status is "Heat demand", hot water
mode will be activated according to the programmer
commands.
4.4 Heat demand (heating)/
Heat demand (stor. tank) (ZSBR.. only)
Heat demand (heating) shows the heat demand status
for the central heating system.
If this channel's status is "Heat demand", heating mode
will be activated according to the programmer com-
mands.
Heat demand (stor. tank) shows the heat demand sta-
tus for charging the heat store.
If this channel's status is "Heat demand", the heat store
will be charged according to the commands from the
heat store thermostat or NTC sensor.
4.5 Heat demand (hot water)/
Keep hot period (ZWBR... models only)
Heat demand (hot water) shows the heat demand sta-
tus for the hot water function.
If this channel's status is "Heat demand", the hot water
function operates according to the commands from the
hot water NTC sensor.
Keep hot period shows the constant hot water circuit
status of the heat exchanger (ECO or Comfort mode).
If this channel's status is "Heat demand", Comfort mode
is active. If the status is "Disabled", ECO mode with
demand detection is active.
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 heat store charging mode
• 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
• switching the appliance off and on again at the mas-
ter switch,
• another demand for heat,
• activating Min or Max mode
• or briefly switching to summer mode on the tempera-
ture control for CH flow.
5.0 Max. output (heating)
Some gas suppliers demand an output-dependent
basic charge.
7 181 465 347 (01.07)
The heating output can be limited to any level between
the min. rated heat output and the max. rated heat out-
put to suit the specific heat requirements.
Even if the heating output is limited, the full
i
rated heat output remains available for hot
water or heat store 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.
5.2 GFA status/error
The status of the automatic ignition module integrated
in the PCB control board is indicated.
5.5 Min. output
The min. heat input is factory set, see technical data.
The modulation range can be extended at the top end
to suit the chimney conditions.
B Refer to settings table for heating and heat store
charging output for details of the min. heat output in
kW and the corresponding percentage (see installa-
tion instructions for boiler).
B Enter percentage on text display module and confirm.
B Measure gas flow rate and compare with the figures
quoted for the percentage shown. If different, correct
the percentage figure!
B Enter min. rated heat output on the commissioning
record enclosed with the appliance.
5.8 Cyclic boiler starts (ZSBR 3/5-16 A... only)
When supplied, this function is activated on the above
appliances and prevents start-up problems caused by
poor ignition characteristics.
A truncated start cycle is activated if the burner has not
been in operation for more than 3 hours.
During a truncated start cycle, the fan runs and the gas
valve is opened long enough to completely fill the gas
pipe with gas (approx. 1 - 2 seconds) but the burner is
not ignited.
This function is not required, and can not be activated,
on any other models.
6.7 Pump off (hot water)
The appliance is supplied with this function activated,
i.e. there is a delay before the pump switches on in hot
water mode. This means that cold water comes out of
the pipe to begin with, followed by hot water once the
pump switches on.
If the pump is set to switch on immediately (Pump off
function deactivated), the hot water temperature rises
gradually until the set temperature is reached.
Boiler service functions
11
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