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Siemens Switzerland Ltd
User manual RVS61.843 CE1U2355en_02
HVAC Products 6 The settings in detail 23. November 2007
Source pump
TQa
t
°C
Q8
1
0
2817
2815 /
2816
OFF
K1
ON
0
Anf
1
2822
2821
2821
2819
2820
Error
2815 Source temp min water
2817 Switching diff source prot
2821 Source startup time max
2822 Time limit source temp min
TQa Source outlet temperature
K1 Compressor 1
Q8 Source pump
Anf Heat request
Line no. Operating line
2815 Source temp min water
2816 Source temp min brine
2817 Switching diff source prot
2818 Increase source prot temp
2819 Prerun time source
2820 Overrun time source
2821 Source startup time max
2822 Time limit source temp min
This function prevents the heat pump from operating at too low source outlet
temperatures. It is intended for plants that use water as the heat source.
If, during operation, the source outlet temperature drops below the “Source temp min
water”, the pumps and the compressor are switched off for the “Time limit source temp
min” (2822).
This function is intended for plants that use the ground as a heat source and is aimed
at preventing the source temperature from dropping excessively. With the exception of
the following 2 points, this function is identical with function “Source temp min water”:
• Function 5804 is used to select whether the temperature at the source inlet or
source outlet shall be considered
• During the time the floor curing function is carried out, the controller raises
automatically the minimum source temperature by the value set on operating
line 2818
The source protection function for brine-to-water heat pumps also applies to setting
“Heat source = external” on operating line 5800.
After the set maximum source startup time (2821), the source temperature must
exceed the source protection temperature (2815 or 2816) by at least the “Switching diff
source prot” (2817) , enabling the compressor to be switched on when there is a valid
heat request.
Functional
interrelationships
Source temp min water
Source temp min brine
Switching diff source prot
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