Siemens RVS41.813 User Manual page 121

LP delay on startup
Siemens Switzerland Ltd
HVAC Products
continues to operate if demand from room heating exists. The flow temperature is not
monitored during the stabilization period. The compressor switches off after reaching
the maximum switch off temperature after the stabilization period expires.
Maximum switch off temperature with negative reduction
Reduction max.
switch off temperature
max. switch off temperature
SD
Komp
0°C
Stufe1
DHW
charge
Behavior with 2 compressors
If the flow or return temperature approaches the maximum switch-off temperature,
compressor 2 should be switched off before compressor 1 reaches its limitation. For
this reason, compressor 2 always switches off at the maximum switch-off temperature
minus the reduction and no status message will appear.
Only the second stage is initially switched off if a negative reduction is parameterized
and both compressor stages are operating for one DHW charge. The flow temperature
is not monitored during the stabilization period. The DHW charge is cancelled with the
flow temperature once again exceed the switch-off temperature after the stabilization
period expires.
Only the second stage is initially switched off if a negative reduction is parameterized
and both compressor stages are operating for room heating. The flow temperature is
not monitored during the stabilization period. The first stage is also switched off if the
flow temperature once again exceeds the switch-off temperature after the stabilization
period expires.
Note: The flow temperature under the circumstances described above is not monitored
during the stabilization period if a negative value is entered for parameter 2845 "Red
switch-off temp max"! (Other monitoring functions such as hot gas, high-pressure, etc.
are not effected).
When starting the compressor, no consideration is given to the low-pressure switch
(E9) during the period of time set here.
User manual RVS61.843, RVS41.813
6 The settings in detail
Temperature demand
Stabilization period
consumer
121/258
CE1U2355en_02
28. September 2009