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Building Technologies Division User Manual LMS14… CC1U7471en
6 The settings in detail 28.01.2015
Line no. Operating line
8310 Boiler temp
8313 Switch point DHW operation
8314 Boiler return temp
8831 DHW temp setpoint
8852 DHW consumption temp
8853 Instant WH setpoint
With the aqua booster, the Keep hot function is always enabled. ECO mode for DHW is
not available here.
After DHW consumption, the Keep hot function is always activated.
Instantaneous water heater with secondary heat exchanger, DHW outlet and inlet sensor (aqua-booster)
This type of aqua booster always requires 2 DHW sensors (sensor B38 and B39) and
does not use a flow switch.
The configuration of this type of aqua booster is made via parameter Aqua Booster Ge
[4765.1].
Line no. Operating line
[4765.1] Aqua Booster Ge
Off
On
Off
This setting is used to configure the variant Aqua booster without outlet sensor and with
optional flow switch.
On
This setting is used to configure the variant Aqua booster with B38 and B39, but without
flow switch.
Sensor B39, which acquires the DHW inlet temperature, is screwed into the DHW inlet
of the secondary plate heat exchanger. Sensor B38, which controls the DHW outlet
temperature, is fitted to the pipe directly downstream from the secondary plate heat
exchanger at the DHW outlet.
To be able to detect a DHW request, a fast temperature drop in the secondary plate
heat exchanger is required. For this reason, the secondary heat exchanger must
always be kept at a certain temperature level. This is ensured by the Keep hot DHW
comfort function.
The Keep hot function is always started at the end of a DHW request. When operating
mode Keep hot is active, the burner operates at minimum output. The 3-port valve is in
the DHW position.
Note!
If Aqua Booster Ge [4765.1] is set to On, sensor B39 must be connected and
Aqua booster (5500) must not be set to No.
Info/diagnostics
Keep hot function
Keep hot function after
DHW consumption
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