YORK INTERNATIONAL
23
FORM 160.52-N1
FIG. 7 – SCHEMATIC OF A TYPICAL PIPING ARRANGEMENT
LD00708
COOLER AND CONDENSER WATER PIPING
The cooler and condenser liquid heads of chiller have
nozzles which are grooved, suitable for welding 150
PSIG DWP flanges or the use of Victaulic couplings.
Factory mounted flanges are optional.
The nozzles and water pass arrangements are furnished
in accordance with the job requirements (see Product
Drawings) furnished with the job. Standard units are
designed for 150 PSIG DWP on the water side. If job
requirements are for greater than 150 PSIG DWP, check
the unit data plate before applying pressure to cooler or
condenser to determine if the chiller has provisions for
the required DWP.
Inlet and outlet connections are identified by labels
placed adjacent to each nozzle.
Chilled Water
Foreign objects which could lodge in, or block flow
through, the cooler and condenser tubes must be kept
out of the water circuit. All water piping must be cleaned
or flushed before being connected to the chiller pumps,
or other equipment.
Permanent strainers (supplied by others) are required
in both the cooler and condenser water circuits to pro-
tect the chiller as well as the pumps, tower spray
nozzles, chilled water coils and controls, etc. The
strainer should be installed in the entering chilled water
line, directly upstream 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 flows through the unit at
all load conditions.
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
pressure must be maintained above cooler pressure. If
operating conditions will fulfill this requirement, no at-
tempt should be made to control condenser water tem-
perature by means of automatic valves, cycling of the
cooling tower fan or other means, since chillers are de-
signed to function satisfactorily and efficiently when con-
denser water is allowed to seek its own temperature
level at reduced loads and off-peak seasons of the year.
However, if entering condenser water temperature can
go below the required minimum, (refer to 160.49-O2)
condenser water temperature must be maintained equal
to or slightly higher than the required minimum. Refer
to Fig. 7 for typical water piping schematic.