Siemens AVS75.39 Series User Manual page 148

Keep hot
Setpoint keep hot
Readj setp keep hot
40°C, or 60°C
Keep hot release
Keep hot time wo heating
Keep hot time with heating
Pump overrun time keep
hot
Keep hot periodically
Min keep hot time
Keep hot in heating
mode
Overrun via inst WH
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Siemens
Building Technologies
Line no. Operating line
5460 Setpoint keep hot
5461 Readj setp keep hot 40°C
5462 Readj setp keep hot 60°C
5464 Keep hot release
None ¦ 24h/day ¦ DHW release ¦ Time program 3/HC3 ¦ Time program
4/DHW ¦ Time program 5
5470 Keep hot time wo heating
5471 Keep hot time with heating
5472 Pump overrun time keep hot
5473 Pump overrun time keep hot
5476 Keep hot periodically
5477 Min keep hot time
5478 Keep hot in heating mode
Off ¦ On
5489 Overrun via inst WH
No ¦ Yes
The heat exchanger for the instantaneous heater can be kept warm to an
adjustable value (5460) to provide the desired DHW setpoint with as little delay as
possible for DHW demand.
Keep hot is triggered within the release times (5464) if the tapping is completed or
if the circulation temperature sensor B39 drops below the keep hot setpoint (5460)
by more than a switching differential.
Keep hot is unavailable for DHW operating modes Off and Eco.
The diverting valve remains in the DHW position for active keep hot. The pump is
switched as needed.
The instantaneous heater is maintained at the set keep hot setpoint for the set
period (5470/5471) if keep hot is enabled (5464).
A setpoint adjustment may be required if the sensor is placed in an unfavorable
position.
The setpoint adjustment for the current keep hot heat setpoint is calculated as per
the straight line by the two curve points "Keep hot setpoint adjustment 40°C or
60°C".
Keep hot can be released never, always, as per DHW release or as per scheduler
program (HC3, DHW or 5).
Keep hot applies by tapping for the set period if the plant is not in heating mode.
Keep hot applies by tapping for the set period if the plant is in heating mode.
The instantaneous heater pump Q34 overruns by the set period after completing
the keep hot function.
The controller can periodically trigger the keep hot function. The intervals can be
set.
The heat exchanger for the instantaneous heater is kept hot at a minimum by the
"minimum keep hot time" when the keep hot function is triggered.
The keep hot function can remain active or be switched off if the plant is in heating
mode.
The instantaneous heater pump Q34 overruns by the set period after tapping is
finished.
User manual RVS43.345
The settings in detail
CE1U2354en_021
2013-09-02