Siemens RVS41.813 - During Compressor Operation

Prerequisites for the 3 examples
•
Setting "Heat source" (5800) must read "Brine" or "Water"
• Setting "Refrigeration" (5807) must read "4-pipe system"
• A process reversing valve must be configured
... cooling pipes ... heating / cooling pipes ... heating / cooling pipes
Passive coolin
g via:
Q9
Q8
B92
Y28
T
T
Q9
Q8
B92
Y28
T
B91
T
Y28
Q9
Q8
B92
Y28
T
B91
T
Y28
Passive cooling ON Passive cooling OFF Passive cooling OFF
"During compressor
operation" (3006)
Condenser pump OFF Condenser pump ON Condenser pump OFF
"In passive c
ooling
mode" (3007)
4-pipe system 2-pipe system 2-pipe system
"Cooling circu
it 1"
(5711)
Line no. Operating line
3000 Switch-off temp max cooling
3002 Source temp min cool mode
3004 SD ch’over cooling pas/act
3006 During compressor operation
3007 In passive cooling mode
3008 Temp diff cond cooling mode
If the return temperature (B71) lies above "Switch-off temp max cooling", the
compressor must not be put into operation. If it is running, it will be switched off.
Sw
itch-off temp max
cooling
On completion
of the set pump prerun times – but not before 2 minutes have elapsed –
the pumps are deactivated if the temperatures are still too high.
Another compressor startup attempt is made on completion of the minimum
compressor off time (2843).
This function i
s only active in the case of active cooling. It has no impact with passive
cooling. For more detailed information about active / passive cooling, refer to page 97.
To prevent the formation of ice in the heat
exchanger for separating the media in
passive cooling mode, a minimum source temperature can be entered. If the
temperature at the source outlet sensor (B92) falls below the value set with parameter
"Source temp min cool mode", the consumers will be locked until the source outlet
temperature exceeds the minimum temperature by 1 °C.
Source temp
min cool
mode (frost protection)
If the source temperature drops belo
w the cooling setpoint minus the switching
differential set here and the minimum compressor on time has elapsed, the controller
switches to passive cooling.
SD ch’o
ver cooling pas/act
SD ch’o
ver cooling pas/act
136/258
Siemens Switzerland Ltd User manual RVS61.843, RVS41.813 CE1U2355en_02
HVAC Products 6 The settings in detail 28. September 2009