Dhw Heating; Increased Dhw Hygiene; Call For Heat - Viessmann B1KE Combi Series Installation And Service Instructions Manual

Function Description
Fault Messages Fault Messages

DHW Heating

Vitodens 100, type B1HE
The burner, circulation pump and 3-way diverter valve
are started or changed over if the tank temperature is
2.5 K (5°F) below the target tank temperature.
The factory-set target boiler water temperature is 20 K
(36°F) higher than the target tank temperature.
If the actual tank temperature exceeds the target tank
temperature by 2.5 K (5°F), the burner shuts down and
circulation pump run-on begins.
WARNING
Risk of injury due to increased DHW temperature.
Inform the system user of the risk from the raised outlet
temperature at the draw-off points. If necessary, provide
on-site scald protection measures.
Fault Messages Fault Messages

Increased DHW Hygiene

Fault Messages Fault Messages

Call for Heat

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Vitodens 100-W, B1HE/B1KE Combi Installation/Service
Tank with temperature switch (Aquastat)
The max. permissible target value of the boiler
(depending on the boiler) is taken as the target.
Function:
No demand from Aquastat – no frost protection.
Demand from Aquastat – demand for target value (no
time program for DHW and no scald protection; no
increased DHW hygiene).
Note: The functions maximum duration of DHW heating
(factory setting = 60 minutes) and minimum
waiting time until the next DHW heating (factory
setting = 60 minutes) still apply.
See system configuration, parameter "DHW"
Gas condensing system boiler:

If the target DHW temperature is set to over 140°F
(60°C)
Gas condensing combi boiler:

If there are several draw-off events in quick
succession or several boiler calibration processes
Vitodens 100, type B1KE
If a DHW flow rate greater than 0.5 GPM is detected,
the boiler switches on and regulates the DHW temperature
to the target value.
The DHW can be heated to a specified (higher) target
DHW temperature (approx. 149°F (65°C) for a period of
one hour.
WARNING
Risk of injury due to increased DHW temperature.
Inform the system user of the risk from the raised outlet
temperature at the draw-off points. If necessary, provide
on-site scald protection measures.
Function:

– If the external call for heat zone is active (contact
plug lH closed), the heating system is supplied with
heat:
– In weather-compensated operation – according
to the current heating curve.
– In constant operation – according to the adjusted
target supply temperature.
– If the external call for heat is inactive (contact open),
the heat supply is stopped.
No frost protection of the zone.