Beer fridge wiring help

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eyuptm

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Hi. Any HVAC engineers lurking here? Just acquired a big pub-type beer fridge, non working when I got it, but cleaned the compressor relay contact and away it went!
Only problem is that the maximum temperature achievable with the inbuilt control is 10°C, which is a little low for me.
Was thinking of controlling the compressor with an STC 100, as with my other fridges, but there are 2 relays in the circuit- one for the compressor and one for the evaporator. My question is, would they both be switched on and off at the same time? And if not, could I switch just the compressor from the STC, and leave the evap to its own devices?
Sorry for going on a bit, your help would be appreciated!!
 

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