Thank you all for the replies:

@Dan

The CO2 pressure should be maintained at 300psig
during no bottling periods.. set point for the ref
unit is at 290psig cut-in and 250psig cut-out.. CO2
pressure...With F22 the suction is 20-25psig and
liquid line at 210-230psig at 85-95F ambients..
The old compressor is rated for *****12-22-502..
model is 3DB-1000-10HP/7.5KW..Using 404a, with
suction length of 35ft. do i have to resize the suction
lines? thanks...

pabs

@US Iceman

You are right... thought it's 10TR... checked the
model and it's 10HP/7.5KW...The main problem is
there is no available unit using new refrigerants
available with our dealer (Copeland) they have
only R22 units...Import request will probably be
the fastest is by early 2007...Our dealer for Bitzer
Germany may have a unit... will check with them..
one more thing, do i change the capacity of the
of the condensing unit? or i'll go for the same
capacity with regards to the old evaporator?
(havent' used 507 so far will have to check
it's pressure/temp behaviour)...thanks... will
follow your advice...

pabs

@TXiceman

thanks for the advice... i have this renewable
filters for both suction and liquid line filters so
no problems there...The old condensing unit is old
anyway having not far away from the from the
cooling towers for the a/c unit and the chems
coming from the vapor drift from the cooling tower
water has made the aluminum powdery... so it
should be a new condensing unit....

pabs