Oil Separator; Refrigerant Circuit; Condenser; Evaporator - York YGWH 115 Installation, Commissioning & Operation

Form 6S6I-B01C-EOMA-EN (0318)

Oil Separator

The YGWH condenser has a built-in internal oil
separator, to remove oil from the refrigerant and return
it back to the compressor for lubrication. An oil sump
is located in the oil separator, along with an oil level
switch to assure the continuous oil supply.
All lubricant must flow through a renewable filter before
it is supplied to compressor to lubricate the bearings
and the rotors.
After lubricating the bearings, the oil is injected
through an orifice located in the closed thread near
the suction end of the rotors. The oil is automatically
injected because of the pressure difference between
the discharge pressure and the pressure at the suction
end of the rotors. This lubricates the rotors as well as
provides an oil seal against leakage around the rotors to
assure refrigerant compression (volumetric efficiency).
An oil heater is located in the oil sump inside the
condenser. The heater is thermostatically controlled to
prevent refrigerant condensation into lubricant during
shutdown.

Refrigerant Circuit

Each unit has an independent refrigeration circuit, the
liquid line components include: a filter, a manual shut-
off valve and throttling device (EEV or fixed orifice).

Condenser

The water-cooled condenser is a cleanable shell and
tube type, with 19 mm thermally enhanced seamless
copper tubes.
The condenser shell is equipped with a pressure relief
valve set to 20.7 Bar. The condenser is manufactured
and tested according to NB/T 47012.
The design working pressure is 10 bar on the
waterside. The water connections are victaulic grooves
as standard, HG20615 welded flanges are available as
an option.
The external surface of the condenser shell on Heat
Pump and Heat Recovery Units, is covered with 19 mm
thick flexible closed-cell foam.

Evaporator

The evaporator is a shell and tube, falling film type heat
exchanger equipped with a pressure relief valve set to
20.7 Bar.
The evaporator is manufactured and tested according
to NB/T 47012.
The external surface of the evaporator shell is covered
with 19 mm thick flexible closed-cell foam. The
water connections are victaulic grooves as standard,
HG20615 welded flanges are available as an option.
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Power Panel

All controls are factory-wired and function tested. The
panel enclosures are designed according to IP22 and
are manufactured from powder-painted steel.
The panel is divided into power supply section, control
section and starter section. The power supply section
and control section have separated hinged, latched,
and gasket sealed doors.

Control Panel

The control panel contains the main PCB (unit
monitoring and control (external inputs / outputs))
and the OptiView™ LT Panel (HMI). The PCBs within
the control and power panel function as a single
microprocessor. Data exchange between the PCBs is
via a RS485 communication bus.

Control System

The microprocessor control system is capable of
single circuit control to maintain liquid temperature
within programmed limits, as well as system safeties,
displaying status, and daily schedules.
Remote starting and flow and equipment interlock can
be accomplished by field supplied contacts.
Remote indications of alarms, run status and pump
control are available as outputs.
Compressor starting/stopping and loading/unloading
decisions are performed by the microprocessor to
maintain leaving liquid temperature.

Accessories and Options

Flow Switch
A paddle type water flow switch with 10.3 bar DWP,
which is applicable to chilled water and cooling water
lines.
Rubber Isolator Pads
Rubber isolators for mounting under the tube sheets
(field mounted).
Spring Isolators
Level adjustable, spring and cage type isolators for
mounting under the tube sheets (field mounted).
EN