Operation Manual

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Siemens Schweiz AG User Manual CE1U2354en
HVAC Products Cooling circuit 23. August 2007
Room influence
Line no. Operating line
928 Room influence
When a room temperature sensor is used, there is a choice of 3 different types of
compensation.
Setting Type of compensation
− − − %
Weather compensation only *
1…99 % Weather compensation with room
influence
100 %
Room compensation only
* Outside sensor required.
The flow temperature is calculated via the cooling curve as a function of the composite
outside temperature.
This type of compensation requires correct adjustment of the heating curve, since in
this case, the control does not take account of the room temperature.
The deviation of the actual room temperature from the setpoint is measured and taken
into account when controlling the temperature. In this way, account is taken of room
temperature deviations, to facilitate more accurate room temperature control. The effect
of the deviation is set as a percentage figure. The better the reference room (correct
room temperature, correct mounting location, etc.) the higher the value can be set.
•
Example:
Approx. 60 % Good reference room conditions
Approx. 20 % Unfavorable reference room
To activate the function, following must be considered:
•
A room sensor must be connected.
•
The ”Room influence“ setting must be selected between 1 and 99
•
There should be no controlled valves in the reference room (mounting location of
the room sensor) (If such valves are installed, they must be set to their fully open
position).
The flow temperature is controlled depending on the room temperature setpoint, the
current room temperature and the progression of the room temperature. For example, a
slight increase of the room temperature causes an immediate drop of the following
temperature.
To activate the function, following must be considered:
•
A room sensor must be connected.
•
“Room influence“ must be set to 100 %.
•
There should be no controlled valves in the reference room (mounting location of
the room sensor) (If such valves are installed, they must be set to their fully open
position).
Room temp limitation
Line no. Operating line
932 Room temp limitation
The room temperature limitation function makes it possible to disable the cooling circuit
pump if the room temperature falls by more than the programmed offset from the
effective room setpoint (with summer compensation, operating line 920).
Compensation variants
Weather compensation
only
Weather compensation
with room influence
Room compensation only