Operating instructions

Heatronic settings | 45
6 720 644 143 (2010/09)
11.3 Description of service functions
11.3.1 Service level 1
Service function 1.A: MAX. OUTPUT (HEATING)
Some gas supply utilities charge a basic rate based on
output.
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.
The factory setting is maximum rated heat output:
B Select service function 1.A.
B Refer to the settings tables (Æ page 72) for the
output in kW and the corresponding setting code.
B Enter the setting code.
B Measure the gas flow rate and compare with the
figures for the setting shown. If they do not match,
change the setting.
B Save the setting.
B Enter the selected output on the “Heatronic settings”
label supplied (Æ page 43).
B Exit service functions.
The display will show the CH flow temperature again.
Service function 1.b: Max. output (hot water - only
ZWB)
The hot water output can be set to any level between
minimum rated hot water output and maximum rated
hot water output to limit it to the specific hot water
requirements.
The factory setting is maximum rated output – display
shows U0.
B Select service function 1.b.
B Take the DHW output in kW and the associated
parameter from the setting tables (Æ page 72 to 73).
B Enter the setting code.
B Measure the gas flow rate and compare with the
figures for the setting shown. If they do not match,
change the setting.
B Save the setting.
B Enter the selected DHW output on the “Heatronic
settings” label supplied (Æ page 43).
B Exit service functions.
The display will show the CH flow temperature again.
Service function 1.C: Pump map (heating)
The appliance is supplied with this function set to 4
(Proportional pressure high). 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.
Even if the output is limited, the full rated
heat output remains available for hot water.
Appliance type Display indication
ZSB 30 ... U0 (100%)
ZWB 37 ... 84
Table 17
In order to save as much energy as
possible and to minimise the possibility of
water circulation noise, a low
characteristic should be chosen.