Specifications

FORM 160.80-NOM1

YORK INTERNATIONAL

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.

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. Refer to Fig. 9 for a

typical water piping schematic. 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 page 37, Condensing

Water Temperature, and the formula to calculate the

minimum Entering Condensing Water Temperature.

FIG. 10 – TYPICAL REFRIGERANT VENT PIPING FROM RELIEF VALVES

LD04896

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-

ers) in the piping as close to the unit as possible, to aid in

obtaining operating checks.

Flow Switches (Field Installed)

A flow switch or pressure differential control in the

chilled water line(s), adjacent to the unit, is an acces-

sory which can be provided by YORK for connection

to the control center. If a flow switch is used, it must

be directly in series with the unit and sensing only wa-

ter flow through the unit. The differential switch must

sense pressure drop across the unit.

Drain and Vent Valves

Drain and vent valves (by others) should be installed in

the connections provided in the cooler and condenser

liquid heads. These connections may be piped to drain if

desired.