Operating instructions

Heatronic settings | 47
6 720 644 143 (2010/09)
Service functions 2.C: Air purge mode
The first time the appliance is switched on, a once-
onlyventing function is activated. The heating pump then
switches on and off at intervals. This sequence lasts
about 8 minutes.
The 2-digit display shows in alternation with the flow
temperature.
The automatic vent will open during venting and then
close once the venting sequence is complete.
If the venting function is set to “On” (with automatic
deactivation), the function is set to “Off” once the
sequence has been completed.
Service function 2.F: Operating mode
There are 3 operating modes to choose from.
• Normal mode: the appliance operates according to
the commands received from the programmer. The
• display shows 0.
• Minimum mode: the appliance runs constantly at
minimum output.
The display shows 1. The 2-digit display alternates
between the CH flow temperature and . After 15
min. the minimal mode changes to normal mode.
• Maximum mode: the appliance runs constantly at
maximum output.
The display shows 2. The 2-digit display alternates
between the CH flow temperature and . After 15
min. the maximal mode changes to normal mode.
The factory setting is 0.
Service function 3.b: Anti-cycle time
The anti-cycle time is factory set to 3 minutes.
The shortest possible anti-cycle time is 1 minute
(recommended for single-pipe and hot-air heating
systems).
If the setting 0 is entered, the anti-cycle time is disabled.
B Enter the anti-cycle time on the commissioning record
enclosed with the appliance.
Service function 3.C: Anti-cycle flow temperature
differential
The switching difference is the permissible differential
from the specified CH flow temperature. It can be set in
increments of 1 K. The adjustment range is 0 to 30 K. The
minimum CH flow temperature is 35 °C.
B Enter the switching difference setting on the
commissioning record supplied with the appliance.
The factory setting is 10 K.
Service function 3.E: Cycle time (Hot water) (ZWB
only)
The appliance is supplied with the pre-heat cycle time
set to 20 minutes.
After pre-heating or DHW demand, this function will
stipulate the period of time before the next permissible
pre-heat. This will prevent excessive pre-heat cycling.
Service function 3.F: Burner off after DHW demand
(Hot water - ZWB only)
The appliance is supplied with the hot water duration
set to 1 minute.
The “hot water duration” time specifies how long, after
hot water has been drawn, that the heating mode
remains disabled.
The venting function can be activated after
servicing.
Note: 1 K = 1 °C.