Electrocoolman
07-11-2006, 06:06 PM
Hi all,
Has anyone come across an electronic display controller that has two independant setpoints (with separate hysteresis) and will control two separate compressors on ONE cabinet probe, as well as providing defrost and fan control?
This is a large cabinet on a single phase supply that uses two separate independant refrigeration circuits, and at this time of year (winter in UK) runs happily on one circuit.
My thoughts are to set the two set points with ranges that overlap, such that the second unit will only switch on if the first unit cannot cope and the cabinet temperature reaches the second 'on' point, such as after a defrost.....thus saving energy.
If one 'combined' controller doesn't exist, then I propose to use two separate controllers....one Master (controlling defrost/fans etc) and one Slave with separate co-located probes, wiring the Slave's output for the second compressor through a relay controlled by the compressor output of the Master.
Has anyone done this or something similar?
Adrian.
Has anyone come across an electronic display controller that has two independant setpoints (with separate hysteresis) and will control two separate compressors on ONE cabinet probe, as well as providing defrost and fan control?
This is a large cabinet on a single phase supply that uses two separate independant refrigeration circuits, and at this time of year (winter in UK) runs happily on one circuit.
My thoughts are to set the two set points with ranges that overlap, such that the second unit will only switch on if the first unit cannot cope and the cabinet temperature reaches the second 'on' point, such as after a defrost.....thus saving energy.
If one 'combined' controller doesn't exist, then I propose to use two separate controllers....one Master (controlling defrost/fans etc) and one Slave with separate co-located probes, wiring the Slave's output for the second compressor through a relay controlled by the compressor output of the Master.
Has anyone done this or something similar?
Adrian.