[rac]

Tyler Enviroguard is the onlr Rack that we use here in New England, we are a supermarket chain with about 50 stores and we have this type of system in several of our stores. We are very pleased with the performance, low refrigerant charge and the free ambient subcooling that we get 8-10 months out of the year. I was just at one of our store last week and we have a low temp rack (r-507) and the ambient was 25 degrees outside and my drop leg was 31 degrees, can't get much better than that for being efficient.The only thing with the Envirogurd is you need to go with the 3rd generation and the SPR valve is replaced by a solenoid that operates on subcooling to bypass refrigerant in the receiver when more condenser surface is needed. We have came up with a great control stradgy and it works!!
So the answer to you question here is nothing but Enviroguard for us.

 

[rac]

Tyler Enviroguard is the only Rack that we use here in New England, we are a supermarket chain with about 50 stores and we have this type of system in several of our stores. We are very pleased with the performance, low refrigerant charge and the free ambient subcooling that we get 8-10 months out of the year. I was just at one of our store last week and we have a low temp rack (r-507) and the ambient was 25 degrees outside and my drop leg was 31 degrees, can't get much better than that for being efficient.The only thing with the Envirogurd is you need to go with the 3rd generation and the SPR valve is replaced by a solenoid that operates on subcooling to bypass refrigerant in the receiver when more condenser surface is needed. We have came up with a great control stradgy and it works!!
So the answer to you question here is nothing but Enviroguard for us.

 

[rac]

Boss, can you delete the first post I sent it twice.