Carel pCO2

Standard Chiller/HP modulare per compressore a vite con driver CAREL
Cod.: +030221241 Rel. 1.0 dated 25 September 03
33
17 Condensation control
Condensation can be performed in the following modes:
• ON/OFF linked to compressor operation (without pressure transducers)
• ON/OFF or modulating linked to reading by the pressure transducer (if the high pressure transducers were enabled)
• ON/OFF or modulating linked to reading by the battery temperature probes (if the battery temperature probes were enabled)
Inputs used:
• high pressure probe B7
• battery temperature probe B3
Outputs used :
• Fan 1
• Fan 2
• Speed control for fans AOUT 1
Parameters used
:
• Selection of condensation control None /pressure/temperature
• Condensation set point
• Condensation band
• Number of fans
• Enable prevent function
• Prevent threshold
• Prevent differential
• Output voltage for inverter minimum speed
• Output voltage for inverter maximum speed
• Inverter speed-up time
17.1 ON/OFF Condensation linked to operation of compressor:
Fan operation will solely depend on compressor operation:
Compressor OFF = fan OFF
Compressor ON = fan ON
17.2 ON/OFF Condensation linked to pressure or temperature sensor :
Fan operation depends on compressor operation and on the value read by the pressure or temperature sensors according to a set point or to a
band. When the pressure/temperature is lower than or equal to the set point, all fans are OFF, but when the pressure/temperature rises to set
point + band, all fans are ON.
17.3 Modulating condensation linked to pressure or temperature sensor :
With this type of condensation, the fans will be controlled through a 0/10 V analogue output, in proportion to demand by the
pressure/temperature sensors. If the lower limit of the ramp is greater than 0 V, there will not be a proportional straight line, but, as in the first
section of the graph, it will be below the set point-diff. by one step.
Set point
Condensation Pressure /
Temperature
10 Volt
Prevention
Threshold
Alarm
Threshold
Control Band
17.4 Prevent function:
This function can be selected under the constructor password, and is used to prevent circuits shutting down due to high pressure.
With the compressor ON, when this threshold is reached, the compressor is capacity-control forced until pressure returns to below the set point -
- a settable differential.
With the compressor OFF, when this threshold is reached, the fans are capacity-control forced until pressure returns to below the set point - a
settable differential.