Matching Evaporator with Condensing Unit

[Abe]

I have a 2 HP Le Unite Condensing Unit which Ill be installing into a freezer unit, running on refrigerant R404 with a cabinet temperature of minus 18 Celcius.
I need to match the condensing unit with an evaporator. Normally I refer to the capacities listed in the manuals from my refrigeration parts wholesaler and use this as a guideline. My calculations tell me that on a TFH2480ZBR condensing unit evaporating at -30C the capacity quoted is 1628 watts.
How do I select an appropriate evaporator which will match this duty.
I need advice from my more learned colleagues what procedures, methods, calculations they would use.