Guide Specifications; Compressor - York YMC2 Manual

Guide Specifications

GENERAL
Furnish YORK YMC² Unit(s) as indicated on the drawings.
Each unit shall produce a capacity of ____ tons, cooling ____ gpm of _____ from ____ to
____ °F when supplied with ____ gpm of condenser water at ____°F. Power input shall
not exceed ____ kW with an IPLV of ____. The cooler shall be selected for _____ fouling
factor and a maximum liquid pressure drop of ____ ft. Water side shall be designed for
____ psig working pressure. The condenser shall be selected for _____ fouling factor
and maximum liquid pressure drop of ___ ft. Water side shall be designed for ____ psig
working pressure. Power shall be supplied to the unit at ____ volts - 3 phase - ___ Hz.
The chiller shall use HFC-134a.
or
Each unit shall produce a capacity of ____ kW, cooling ____ l/s of _____ from ____ to
____ °C when supplied with ____ l/s of condenser water at ____°C. Power input shall not
exceed ____ KW with an IPLV of ____. The cooler shall be selected for _____ m2 C/W
fouling factor and a maximum liquid pressure drop of ____ kPa. Water side shall be de-
signed for ____ barg working pressure. The condenser shall be selected for _____ foul-
ing factor and maximum liquid pressure drop of ___ kPa. Water side shall be designed for
____ barg working pressure. Power shall be supplied to the unit at ____ volts - 3 phase
- ___ Hz. The chiller shall use HFC-134a.
Each unit shall be completely factory packaged including evaporator, unit mounted Op-
tiSpeed VSD, condenser, sub-cooler, compressor, hermetic motor, OptiView Control Cen-
ter, and all interconnecting unit piping and wiring. The chiller shall be painted prior to
shipment.
Performance shall be certified in accordance with AHRI Standard 550/590. Only chillers
that are listed in the AHRI Certification Program for Centrifugal and Rotary Screw Water
Chillers are acceptable.
The initial charge of refrigerant shall be supplied, factory charged in the chiller or shipped
in containers and cylinders for field installation.

COMPRESSOR

The compressor shall be a single-stage centrifugal type powered by a high speed, direct-
drive electric motor. A cast aluminum, fully shrouded impeller shall be mounted directly to
the motor shaft. The impeller shall be designed for balanced thrust, dynamically balanced
and overspeed tested for smooth, vibration free operation. Compressor castings shall be
designed for 235 psig (16 barg) working pressure and hydrostatically pressure tested at
355 psig (24.4 barg) for HFC-134a units.
Capacity control shall be achieved by the combined use of variable speed control and
mechanical flow regulation to provide fully modulating control from maximum to minimum
load. The unit shall be capable of operating with lower temperature cooling tower water
during part-load operation in accordance with AHRI Standard 550/590. All capacity con-
trol devices shall be automatically controlled to maintain a constant leaving chilled water
temperature.
JOHNSON CONTROLS
FORM 160.84-EG1 (617)
63