YORK INTERNATIONAL
24
FORM 160.73-N1 (904)
springs are out of align ment, the misalignment must
be corrected by properly sup port ing the piping or by
ap ply ing heat to anneal the pipe.
If the piping is annealed to relieve
stress, the in side of the pipe must be
cleaned of scale be fore it is fi nal ly
bolt ed in place.
EVAPORATOR AND CONDENSER WATER PIPING
The evaporator and condenser liquid heads of chiller
have nozzles which are grooved, suitable for welding
150 PSIG DWP fl anges or the use of Victaulic cou plings.
Factory mount ed fl anges are optional.
The nozzles and water pass arrangements are fur nished
in accordance with the job requirements (see Product
Draw ings) furnished with the job. Standard units are
de signed for 150 PSIG DWP on the water side. If job
re quire ments are for greater than 150 PSIG DWP, check
the unit data plate before applying pressure to evap o ra tor
or con dens er to determine if the chiller has pro vi sions
for the required DWP.
Inlet and outlet connections are identifi ed by labels
placed adjacent to each nozzle.
Chilled Water
Foreign objects which could lodge in, or block fl ow
through, the evaporator and condenser tubes must be
kept out of the water circuit. All water piping must be
cleaned or fl ushed before being connected to the chiller
pumps, or other equipment.
Permanent strainers (supplied by others) are re quired
in both the evaporator and condenser water circuits to
pro tect the chiller as well as the pumps, tower spray
noz zles, chilled water coils and controls, etc. The
strain er must be installed in the entering chilled water
line, di rect ly up stream of the chiller.
Water piping circuits should be arranged so that the
pumps discharge through the chiller, and should be
con trolled as necessary to maintain essentially constant
chilled and condenser water fl ows through the unit at
all load con di tions.
If pumps discharge through the chiller, the strainer may
be located upstream from pumps to protect both pump
and chiller. (Piping between strainer, pump and chiller
must be very carefully cleaned before start-up.) If pumps
are remotely installed from chiller, strainers should be
located directly upstream of the chiller.
Condenser Water Circuit
For proper operation of the unit, condenser refrigerant
pres sure must be maintained above evaporator pres sure.
If op er at ing con di tions will fulfi ll this requirement, no
at tempt should be made to control condenser water
tem per a ture by means of automatic valves, cycling of
the cooling tow er fan or other means, since chillers are
de signed to function satisfactorily and effi ciently when
con dens er water is al lowed to seek its own temperature
lev el at reduced loads and off-peak seasons of the year.
How ev er, if entering con dens er water temperature can
go be low the required min i mum, (refer to 160.73-O1)
con dens er water temperature must be maintained equal
to or slightly higher than the required minimum. Refer
to Fig. 13 for typical water pip ing schematic.
FIG. 13 – SCHEMATIC OF A TYPICAL PIPING ARRANGEMENT
LD08529
EVAP O RA TOR
To Next Page
Loading...
Need help?
General