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Siemens Switzerland Ltd
User manual RVS61.843 CE1U2355en_02
HVAC Products 6 The settings in detail 23. November 2007
ON
OFF = TVLw
B4
K
1K
B41
T
OFF
ON
t
B4 Upper buffer or combi storage tank sensor
B41 Lower buffer or combi storage tank sensor
TVLw Flow temperature setpoint
K Compressor
ON Switch-on point
OFF Switch-off point
The switch-on / off points are impacted by a number of other functions (maximum
switch-off temperature, compensation of heat deficits, compressor running time
minimum, compressor off time minimum, pump prerun time, and pump overrun time).
The heat pump is switched off as soon as the buffer or combi storage tank temperature
has reached the setpoint. The minimum off time is always observed, however, even if
the temperature at the upper buffer storage tank sensor drops below the switch-on
point.
Required sensors:
In the case of control with buffer or combi storage tank, the upper buffer storage tank
sensor (B4), the lower buffer storage tank sensor (B41) and the relevant source sensor
must be installed.
If the lower buffer storage tank sensor (B41) is missing, the controller uses the return
temperature sensor (B71) for switching the heat pump off.
Compressor settings
The settings apply to compressor 1 and – if present – to compressor 2 also.
Line no. Operating line
2841 Keep compr run time min
2842 Compressor run time min
2843 Compressor off time min
2844 Switch-off temp max
2845 Red switch-off temp max
2852 LP delay on startup
This determines if the minimum compressor running time set on operating line 2842
shall be observed if the heat request is stopped prematurely:
No
No consideration is given to the minimum compressor running time. When there is no
more heat request, the compressor is switched off.
Yes
The minimum compressor running time is also observed when there is no more heat
request.
Keep compr run time
min
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