Modular Standard HP Chiller for Carel driver
Carel code +030221236- Rel. 1.0 dated 7 July 2003
26
13 DEFROSTING CONTROL FOR WATER/AIR MACHINE
13.1.1 INPUTS USED
• Battery 1 temperature (can be used as a pressure switch)
• Battery 2 temperature (can be used as a pressure switch)
• Input for defrosting pressure switch 1
• Input for defrosting pressure switch 2
13.1.2 PARAMETERS USED
• Inputs used for defrosting
• Type of overall defrosting (simultaneous / separate)
• Type of local defrosting (simultaneous / separate)
• Defrosting start set-point
• Defrosting stop set-point
• Defrosting maximum delay time
• Maximum defrosting time
13.1.3 OUTPUTS USED
• Compressor 1
• Compressor 2
• Compressor 3
• Compressor 4
• Cycle reversing solenoid-valve 1
• Cycle reversing solenoid-valve 2
• Circuit No.1 fan
• Circuit No.2 fan
13.2 DEFROSTING TYPE 1
overall simultaneous / local simultaneous
Only one circuit has to request entering the defrosting cycle for all circuits to forcibly enter defrosting. Circuits which do not need to defrost
(temperature above defrosting stop set-point) stop and wait. As soon as all circuits finish defrosting, the compressors may redstart on heat pump
operation.
13.3 DEFROSTING TYPE 2
overall separate / local simultaneous
With this type of defrosting, there is a separate defrosting among the different pCO units, and a simultaneous defrosting inside the pCO Unit.
The first pCO unit requesting to defrost enters defrosting (simultaneous defrosting inside the unit). Even if they request defrosting, the other
units continue waiting (still operating on the heat pump) unit the first unit finishes defrosting. When the first unit finishes, the next unit needing
to defrost enters defrosting (simultaneous inside the unit) and the others continue waiting.
13.4 DEFROSTING TYPE 3
overall separate / local separate
With this type of defrosting, each refrigerating circuit enters defrosting separately. The first circuit requesting to defrost enters defrosting,
whereas, the others, even if they request defrosting, continue waiting until the first has finished defrosting. When it has finished, the next circuit
needing to defrost enters defrosting and the others continue to wait.
Defrosting a circuit with time/temperature control
time
t1 t2
t3
Defrosting cycle
temperature
set.start
set.stop
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