Cooler And Condenser Water Piping; Cooling Units - Chilled Water; Cooling Units - Condenser Water Circuit; Stop Valves - York MILLENNIUM YS Manual

Installation

COOLER AND CONDENSER WATER PIPING

The cooler and condenser liquid heads of YS units have
nozzles which are grooved, suitable for welding 150 psig
(1034 kPa) DWP flanges or the use of Victaulic cou-
plings.
The nozzles and water pass arrangements are furnished
in accordance with the job requirements (see Product
Drawing, Form 160.47-PA1). Standard units are designed
for 150 psig (1034 kPa) DWP on the water side. If job
requirements are for greater than 150 psig (1034 kPa)
DWP, check the unit data plate to determine if the unit
has provisions for the required DWP before applying
pressure to cooler or condenser.
COOLING UNITS – CHILLED WATER
Chilled water must leave the cooler through the con-
nection marked "Liquid Outlet". Cooling water must en-
ter the condenser through the connection marked "Liq-
uid Inlet". Refer to Figure 9.
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 unit, pumps, or
other equipment.
Permanent strainers (by others) are required in both the
cooler and condenser water circuits to protect the unit
as well as the pumps, tower spray nozzles, chilled water
coils and controls, etc. The strainer, meeting York speci-
fications should be installed in the entering chilled water
line, directly up-stream of the unit.
FIG. 9 – SCHEMATIC OF A TYPICAL PIPING ARRANGEMENT FOR COOLING UNITS
20
Water piping circuits should be arranged so that the
pumps discharge through the unit. The circuits should
be controlled as necessary to maintain essentially con-
stant chilled and condenser water flows through the unit
at all load conditions.
If pumps discharge through the unit, the strainer may be
located upstream from the pumps to protect both pump
and unit. (Piping between the strainer, pump and unit
must be very carefully cleaned before start-up.) If
pumps are remotely installed from the unit, strainers
should be located directly upstream.
COOLING UNITS – CONDENSER WATER CIRCUIT
For proper operation of the unit, condenser refrigerant
pressure must be maintained above cooler pressure. If
operating conditions will fulfil 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. YS units are designed
to function satisfactorily and efficiently, when condenser
water is allowed to seek its own temperature level at
reduced loads and off-peak seasons of the year. How-
ever, if entering condenser water temperature can go
below the required minimum, condenser water tempera-
ture must be maintained equal to or slightly higher than
the required minimum. Refer to Figure 9 for a typical
water piping schematic for the cooling unit.

STOP VALVES

Stop valves may be provided (by others) in the cooler
and condenser water piping, adjacent to the unit to ease
maintenance. Pressure taps should be provided (by oth-
LD03299
YORK INTERNATIONAL