Basseng,
What type of control valves are using at your load/process side.Is there any by pass line in primary circuit.If so, how do you control the bypass flow and what is your differential pressure in primary circuit.
ssarcia,
What is the compressor capacity ? kcal/hr, btu/hr between new and old one.The best, you should source or ask from your supplier or manufactuter.Capacity is more important than pressure, if capacity is the same you not necessary to look into pressure.