t.a.c. Satchwell Climatronic CSC5252, Руководство пользователя

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3.3. DISTRICT HEATING SYSTEMS
This application operates a two or three port valve to control the secondary water
temperature of the heat exchanger based on the outside temperature. In
Scandinavian applications a DWT sensor can be connected to the CSC via the input
used for Room Influence. The CSC will use the DWT sensor to control the Primary
Return Temperature. This will ensure that the permitted limits will not be exceeded.
Space Frost Protection or room influence cannot be offered if the maximum return
sensor is used.
Where the primary medium could enable extremely high secondary water
temperatures, a dedicated safety circuit is required.
If a clock version CSC is used then the clock determines whether the compensator
operates in day or Night Set-Back (NSB) mode. The CSC can be set to allow the
heating i.e. pump, valve etc., to run at reduced set points or turn off during the off
periods. When in NSB mode the action of Room Influence is adjusted to work only
in a negative fashion as to reduce the flow temperature. The flow temperature will
be lowered by 3
°
C for every 1
°
C the room temperature is above the relaxed set point
(Svn). The compensator has 2 compensation ratios and a high limit function to
prevent excessive set points occurring.
Out of hours, if the outside temperature drops below an adjustable frost setting,
defaulted to 0
°
C, the pump is enabled and "Auto 1" is displayed on the controller.
The CSC will resume normal operation when the outside temperature increases by
2
°
C. If a space sensor is used then this will also provide frost protection to protect
the building fabric. The low space temperature is adjustable but is normally set to
10
°
C. If this limit is passed then the heating will come on in boost to ensure the
fastest possible relief. "Auto 3" will be displayed during this period. The frost
condition will be removed when the space temperature has risen by 2
°
C. If for any
reason, the flow temperature should fall below 5
°
C the CSC will act to remove the
possibility of frost. The controller will start the pump and open the valve to raise the
water temperature of the system, the CSC will remain in this condition for 30
minutes. If the water frost event occurs during a standby period, the CSC will
display "Auto 2".
If your CSC does not have a time clock then Frost Protection is not included as the
controller does not control the pump. All frost protection must be provided by other
interlocked devices such as thermostats.
If under floor heating is used please remember to check the high limit setting as not
to allow excessive flow temperatures.
The INF setting in Fine Tune Mode must be set to 3 to enable the max. return
application and settings.
October, 03 CSC USER GUIDE
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