PIPE GRID                                    
This is 32mm bore refrigeration grid pipe.  Normal pipe runs per circuit are   
800m, but up to 4000m is allowed.   (Min/max) evap temp -40/10 deg C,          
Temp diff 2/25 deg C.  Can be used with R12, R22, R502 and R717 systems, but   
only recommended for R717 use.  Can be direct expansion, flooded or pump       
circulation, but maximum circuit lengths of 200 m recommended except for pump. 
