YZ Engineering Guide
Form: 161.01-EG1 (0618)
12
Condenser
The condenser is a shell and tube type heat exchanger with a discharge gas baffle to prevent direct high velocity
impingement on the tubes. The baffle is also used to distribute the refrigerant gas flow properly for the most efficient heat
transfer. An integral subcooler is located at the bottom of the condenser shell, providing highly effective liquid refrigerant
subcooling to provide the highest possible cycle efficiency. A 38 mm (1.5") liquid level sight glass is conveniently located
on the side of the shell to aid in determining proper refrigerant charge. The condenser contains dual refrigerant relief
valves.
Waterboxes
The removable waterboxes are fabricated of steel. Integral steel water baffles are located and welded within the waterbox
to provide the required pass arrangements. Stub-out water nozzle connections welded to the waterboxes are suitable
for ANSI/AWWA C-606 couplings, welding or flanged, and are capped for protection during shipment. Plugged 19 mm
(3/4") drain and vent connections are provided in each waterbox.
Water Flow Switches
Thermal or differential pressure type water flow switches are factory mounted in the evaporator and condenser water
nozzles, and are factory wired to the OptiView
™ control panel.
Refrigerant Flow Control
Refrigerant flow to the evaporator is controlled by the YORK® variable orifice control system. Liquid refrigerant level is
continuously monitored to provide optimum subcooler, condenser and evaporator performance. The variable orifice
electronically adjusts to all real-world operating conditions, providing the most efficient and reliable operation of
refrigerant flow control without the use of a refrigerant pump.
Refrigerant Purge Unit
The purge is designed to meet the ASHRAE Standard 147 where at most one unit mass of refrigerant is purged per one
unit mass of air removed by the unit. This automatic, self-contained, high-efficiency purge unit collects non-condensable
gases to be removed from the chiller. The YORK® purge is factory assembled, mounted, piped, and wired, and operates
automatically. Purge exhaust cycles are monitored, and if excessive, provide warning of a potential system leak to the
OptiView
™ Control Center.
ISOLATION MOUNTING
The unit is provided with four vibration isolation mounts of nominal 25.4 mm (1") operating height. The isolators have a
neoprene pad to contact the foundation, bonded to a steel plate. The vibration isolation pad assemblies mount under
steel plates welded to the chiller tube sheets.
Optionally, spring isolation mounting is available instead of standard isolation mounting pads. Four level-adjusting,
spring-type vibration isolator assemblies with non-skid pads are provided for field-installation. Isolators are designed for
25.4 mm (1") of deflection.