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Siemens Switzerland Ltd
User manual RVS61.843 CE1U2355en_02
HVAC Products 6 The settings in detail 23. November 2007
To prevent damage to the compressor due to too frequent switching cycles, the
compressor always operates for at least the period of time set here, each time it is
switched on. During storage tank charging and in the case of active limitations, the
minimum compressor running time is inactive.
For the same reason, the compressor remains switched off for the minimum period of
time set here.
If the flow or the return temperature exceeds the maximum switch-off temperature, the
compressor will be switched off.
The heat pump is switched on again when the temperature at both sensors has
dropped by the “Switching diff return temp” (2840) below the maximum switch-off
temperature and the minimum off time has elapsed.
t
T
Anf
0
S1
1
OFF
ON
2845
0°C
2844
0
TWW
1
SD
Komp
OFF TWW
2844 Switch-off temp max
2845 Red switch-off temp max
Anf Temperature request from the consumers
SD
Komp
Compressor switching differential
ON Switch-on point
OFF Switch-off point
OFF TWW Switch-off point DHW
S1 Speed 1.
TWW DHW charging
In the case of DHW charging, forced buffer storage tank charging and when operating
the second compressor stage, "Switch-off temp max” (2844) is reduced by this value.
If the flow or the return temperature (B21 / B71) exceeds this level, DHW charging or
forced buffer storage tank charging is prematurely aborted and a change to space
heating takes place, provided space heating calls for heat.
In this case, the heat pump continues to operate with no interruption.
If there is no demand for heat from space heating, the heat pump is switched off.
It can resume operation only when the minimum off time (2843) has elapsed, provided
the flow or return temperature (B21 / B71) has dropped below the reduced maximum
switch-off temperature by the amount of the adjustable switching differential (2840).
If an electric immersion heater is installed, DHW charging can be completed.
Otherwise, for DHW charging to be resumed, the DHW storage tank temperature (B3)
must drop by the amount of the DHW switching differential (5024).
If a second compressor is in operation, it is always switched off when the reduced
switch-off temperature is reached, and no status message is displayed. During DHW
charging, or in the case of forced buffer storage tank charging, compressors 1 and 2
are switched off at the same time.
Compressor run time
min
Compressor off time min
Switch-off temp max
Red switch-off temp max
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