During Compressor Operation - Siemens RVS41.813 User Manual

Passive cooling via:
"During compressor
operation" (3006)
"In passive cooling
mode" (3007)
"Cooling circuit 1"
(5711)
Switch-off temp max
cooling
Source temp min cool
mode (frost protection)
SD ch'over cooling pas/act
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HVAC Products
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
Q9
T
B92
T
Q8
Y28
Passive cooling ON
Condenser pump OFF
4-pipe system
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.
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 is 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.
If the source temperature drops below 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'over cooling pas/act
User manual RVS61.843, RVS41.813
6 The settings in detail
... heating / cooling pipes
Y28
Q9
B91
T
B92
T
Q8
Y28
Passive cooling OFF
Condenser pump ON
2-pipe system
... heating / cooling pipes
Y28
Q9
B91
T
B92
T
Q8
Y28
Passive cooling OFF
Condenser pump OFF
2-pipe system
CE1U2355en_02
28. September 2009