Modular Standard HP Chiller for Carel driver
Carel code +030221236- Rel. 1.0 dated 7 July 2003
25
12 CONDENSATION CONTROL
12.1 OPERATING 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 1 and 2 temperature probes (if the battery temperature probes were enabled)
12.1.1 INPUTS USED
• high pressure probe C1
• high pressure probe C2
• battery temperature probe C1
• battery temperature probe C2
12.1.2 OUTPUTS USED
• Fan 1
• Fan 2
• Fan 3
• Speed control for fans C1 AOUT 1
• Speed control for fans C2 AOUT 2
12.1.3 PARAMETERS USED
• Selection of condensation control None /pressure/temperature
• Type of condensation battery (Single/Separate)
• Condensation set-point
• Condensation band
• Number of fans per battery
• Enable prevent function
• Prevent threshold
• Prevent differential
• Output voltage for inverter minimum speed
• Output voltage for inverter maximum speed
• Inverter speed-up time
12.2 ON/OFF CONDENSATION LINKED TO OPERATION OF COMPRESSOR
With this type of condensation, fan operation will solely depend on compressor operation:
Compressor OFF = fan OFF
Compressor ON = fan ON
12.3 ON/OFF CONDENSATION LINKED TO PRESSURE OR TEMPERATURE SENSOR
With this type of condensation, 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.
You may select condensation with a single or separate battery: with single battery condensation, the fans are commanded by the highest
pressure/temperature; with separate battery condensation, every pressure/temperature sensor commands its fan.
12.4 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. In this case too, you may select single battery or separate batteries condensation. The control is according to the
same methods described above. 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.
12.5 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 drops below the set-point -
differential (both can be set). With the compressor OFF when this threshold is reached, compressor forcing is replaced by forced power up of
the fans.
Set point
high pressure
temperatura batt.
0 Volt
10 Volt
Prevent
threshold
Alarm
band
1 bar
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