some things come to mind, reset the ahu supply air temp occording to vav demand, reset the ahu supply static pressure based on vav damper position and demand, do an internet search on ahu sequences, many big projects post the sequences.
old tranes i believe used 25 psig for the pump down , at this pressure there will be no liquid in the evap.and as any liquid boils off the pressure switch will reenergize the compressor and pump the vapor out.
dcv will save the client money in a very short time. for most units the design fresh air frequently unneeded due to the max occupancy not being maintained. depending on the accuracy of the co2 monitor used yes yo can almost count the people in the room, though you will only see increases in co2...
the rubber hits the road when a commissioning agent,this should be someone out side of the installation team or the startup team, tests the equipment to determine if it will do what it was designed to do and if he design intent was meet by the installers .startup takes care of all of the pieces...
to put it simply pre-commissioning is crossing the 't's and doting the 'i's.commissioning is when the rubber is put to the road.without putting the system through a total test you have not commissioned it.
the vacuum required is a direct result of the boiling point of the refrigerant being used in the system.if the system is say r-22 with a -40f boiling point the triple down to <500mic is a well established and proven method.But when the system uses say r-23 with a boiling point of -116f the 50 to...
jmtop
first off all mentioned above is good stuff.
but how old is the pump and motor existing?
replacement of the whole pump assembly might be warranted.
there are no hydraulic problems from a chilled water pump failure, only cooling problems . depending on the reliability needed the best bet...
power exh is one way to control building pressurization. how do you intend to control the static pressure of the building during economizer and during normal run with fresh air make-up? is the return ducted or plenum?ducted returns should have return fan. you may also want to consider an exhaust...
moved out of a house last year that had cast iron boiler to black iron to copper on a mono-flow system installed in 1955 . boiler had been repllaced but the pipes were ok .no problems on the bi to cop no corrosion no leaks . it was only there 48 years though so time will tell.
