If pumps discharge through the chiller, the strainer can 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.
Figure 9: Schematic of a typical piping arrangement
Condenser water circuit
For the correct operation of the unit, condenser refrigerant pressure must be maintained above
evaporator pressure. If operating conditions will fulfill this requirement, do not control condenser
water temperature by means of automatic valves, cycling of the cooling tower fan or other means,
since chillers 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. If entering
condenser water temperature can go below the required minimum, refer to
Unit Operation and
Maintenance (Form 160.75-O1),
condenser water temperature must be maintained equal to or
slightly higher than the required minimum. See Figure 9 for typical water piping schematic.
Stop valves
Stop valves are not provided by Johnson Controls. Stop valves can be provided by others in
the evaporator and condenser water piping adjacent to the unit to facilitate maintenance.
Thermometer wells and pressure taps can be provided by others in the piping as close to the unit
as possible to facilitate operating check.
Flow switches
Thermal type water flow switches are factory mounted in the chilled and condensed water nozzles
and are factory wired to the OptiView™ control panel. These solid-state flow sensors have a small
internal heating element and use the cooling effect of the flowing fluid to sense when an adequate
flow rate is established.
Waterbox drain and vent valves
Drain and vent valves are not provided by Johnson Controls. If using drain and vent valves install
them in the connections provided in the evaporator and condenser liquid heads. These connections
can be piped to drain.
Model YK (Style G) Centrifugal Liquid Chiller
24
Summary of Contents for YORK YK Series
Page 2: ...2 Model YK Style G Centrifugal Liquid Chiller...
Page 14: ...Figure 3 Long term storage tube side Model YK Style G Centrifugal Liquid Chiller 14...
Page 19: ...Figure 6 Neoprene isolators in mm 19 Model YK Style G Centrifugal Liquid Chiller...
Page 20: ...Figure 7 Spring isolators in mm Model YK Style G Centrifugal Liquid Chiller 20...
Page 21: ...Figure 8 Spring isolators continued in mm 21 Model YK Style G Centrifugal Liquid Chiller...
