fellas dont bash to hard, my carrer has been in resid. and light commerical for 7 yrs., and i recently hooked up with a all commerical co. and lovin it, pay is very good and work is laid back, anyway got sent out too a closed down groc. store to survey their Mech. equip., as i walked in the store i noticed a set of blueprints for store on a table, sweeet i said, as i was going over the mech. plans i noticed several things that stood out that i'm not familar with, the ahu specs are: 1) heat reclaim coil which is part of the refrigeration system for the store, as i understand it the heat energy that is gained in a refrigeration system can be used for basicly free heat and all the great advantages, this coil had 5 circuits feeding it, each circuit has 1 line insulated and the other refrig. line not, the non insulated line also had a head press. control from sprolain and it looked all copper with an adjustable screw on top, i think i've seen in a book some where, what is the purpose of it? other than to maintain a desired press.
the ahu also has a dx coil as well, with two 10 ton condensers piped to it,
heres where i get stumped/ in between the heat coil and dx coil theres a mixing box which is ducted to the supply to a outdoor air unit, which has no blower just a evap coil, there are 3 more 7.5 ton condensers piped into this unit, and the controls just doesnt seem too eff. and are not unit safe friendly
anybody care to share their knowledge