Air-cooled Scroll Chiller

YCAB-B
Air-cooled Scroll Chiller/
Air Source Heat Pump

Air-cooled Scroll Chiller/Air Source Heat Pump YCAB-B Series
YORK Air-cooled Scroll Chiller / Air Source Heat Pump YCAB-B Series provides chilled and hot water for central air
conditioning applications using central station air handling or terminal units. They are completely self-sufficient and are
designed for outdoor (roof or ground level) installation. Each unit includes hermetic flexible scroll compressors, aircooled
condenser, evaporator, and a microprocessor control center. All components are mounted on a steel base.
Compressor
This unit uses flexible scroll compressors. A system uses
2 to 3 parallel compressors, providing multilevel capacity.
They compressor motor is cooled by the refrigerant gas.
A PTC temperature sensor is mounted on the coils at each
phase, providing thermal protection for the motor coils by
sending a thermal signal to the protection module on the
solid-state motor. Across the line starter is used for
compressor motor starting.
Evaporator
Evaporator of YCAB100/130/150/160 is plate type. It is
manufactured, tested and accepted in accordance to JB/8701-
1998 plate heat exchange guidelines. The design pressure is
2.8MPa on refrigerant side and 1.0MPa on water side. Cooler
is wrapped in 19mm thick flexible closed-cell foam.
Evaporator of YCAB200/210/250/270/330 is a directexpansion
shell and tube unit. It is manufactured, tested and
accepted in accordance to GB151-1999 Shell and Tube Heat
Exchanger guidelines, referring to JB6917-1998 Pressure
Container for Refrigerating Equipment. The design pressure
is 2.8MPa on the refrigerant side and 1.0MPa on the water
side. The refrigerant is on the tube side and the chilled water
is on the shell side, where a baffle is provided. The heat
exchanging tube is composed of high efficiency external
threading and seamless copper tubing, and is wrapped in
19mm thick flexible closed-cell foam.
The refrigerant circuits are protected by 350Psig safety valves
for chiller unit and 400Psig safety valves for heat pump unit.
Condenser
Coils - “V” type coils are designed for YCAB 100/130/150/160,
and “W” type for YCAB 200/210/250/270/330. The copper tubes
are mechanically expanded into high-efficiency aluminum fins.
The connecting heat pump unit uses hydrophilic aluminum fins.
Fans - The fans are low-noise and of high-efficinecy. The
blades are made of LY12 aluminum-alloy with a plasticsprayed
surface. Fans are directly driven by independent
motors and positioned for vertical air discharge. All blades
are statically and dynamically balanced.
Motors - The fans are full hermetic, air-cooled, three-phase,
squirrel-cage motor, with inner superheat protector and
aluminum case.
Refrigerant Circuit
One or two independent refrigerant circuits will be finished
on each unit. Each circuit includes a main liquid check valve,
filter drier, solenoid valve, sight glass, expansion valve, and
a high/low pressure switch. The refrigeration system is
pressure-tested, leak-tested, and evacuated and charged with
refrigerant. All liquid pipes after the expansion valve and all
suction pipes use flexible closed-cell foam insulation.
General
YORK Air-cooled Scroll Chiller / YCAB-B models are assembled completely from the factory. All
related refrigerant circuits and internal wirings are properly connected and the field installation is
easy. It is ready for operation right after connecting water, power and control circuits.
The unit is pressure-tested, evacuated, and fully charged with refrigerant and oil. An operational test
is performed to assure that the refrigeration circuit and control device operate correctly.
The unit structure is made of heavy-gauge, galvanized steel. Each part is pre-processed with zinc
phosphate and coated with polyester powder. The color of the unit surface is gray. There are lifting
holes on the frame for the international container and mounting holes for the damping device.
Nomenclature
YC A B130 S C 50 B
Design Code
50Hz
Refrigerant: C-HCFC-22, B-HFC-407C
Series: S-Cooling only, R-Heat Pump
Nominal Capacity
Scroll Compressor
Air-cooled
YORK Chiller
2

Specifications and Options
Microprocessor Control Center
All controls and starting devices are installed and fully
tested in the factory. The control cabinet includes a power
supply, control center and control devices. All are located
in an enclosure. The cabinet is composed of two
independent parts; a motor starter and a unit controller.
The cabinet has a hinged door. The design of the
enclosure complies with the IP55 waterproof and dustproof
standards. The surface is painted ivory.
The unit is equipped with the following control
functions:
LCD Display
4-row by 15-column English display
Operation Status Display
Operating data - Includes inlet and outlet temperature of
chilled water, ambient temperature, and exhaust and
suction pressures of each system.
Operating fault - When a fault occurs, the unit can self
diagnose, display the cause, and send an alarm to the
buzzer and indicator LED. The failure alarm history is
logged for query.
DI and DO status - Displays the DI (Data Input) and DO
(Data Output) status of all modules.
Control Protection
The unit has the following control protection functions:
Flow switch
External interlock
Frequent compressor start-stop protection
Compressor even running
Compressor overload protection
Fans overload protection
Exhaust overpressure protection
Suction overpressure protection
Low/high water temperature protection
Power protection
The unit also has other control functions such as:
Auto/manual frost protection
Remote monitor and control
Schedule start/stop
Energy control
Manual test function
Operation limit
Plug-and-play system
Network control
RS-485/RS-232 standard serial communication ports
Operation Limitations
Power
Standard power supply is 380V 3N ~ 50Hz. Minimum
allowed voltage is 342V and maximum allowed is 418V.
Operating ambient temperature
The temperature ranges is:
Chiller unit: -10 ~ 45
Heatpump unit: -10 ~ 24
Water temperature
The unit can choose the inlet and outlet chilled water
temperature control mode.
Outlet cool water: min. 5 , max. 12
Inlet cool water: min. 7 , max. 17
Outlet hot water: min. 40 , max. 50
Inlet hot water: min. 35 , max. 45
Options
The unit provides the following options:
Air-cooled Coil Protection
The standard unit uses copper tubes with aluminum fins.
For coastal, fog environment and other corrosive
applications, this unit provides the option to protect the
coils:
Air-cooled coils with black fins - the aluminum fins are
coated with black epoxy resin.
Unit Protection Grid
A wire-mesh protection grid can be installed around the
unit to protect internal components, preventing
unauthorized operation and keeping ventilation.
High Static Pressure Fans
The unit is capable of choosing a high static pressure fan
(100Pa static pressure), used for applications that need
duct connection.
Evaporator Insulation
The standard unit uses 19mm heat insulation material.
38mm insulation can be chosen if required.
Compressor Noise Reduction Cabinet
A noise reduction cabinet can be installed outside the
compressor. The cabinet is made of porous acoustic
panels and can reduce the operating noise effectively.
Spring Isolator
Level adjustable type spring isolator (field mounted).
3

Main Technical Parameters
Dimension Table
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Note: 1. The standard operating conditions:
Cooling: temperature of inlet/outlet chilled water 12°C/7°C, outdoor temperature 35°C.
Heating: temperature of Inlet/outlet chilled water 40°C/45°C, outdoor temperature 7°C.
2. If heat pump unit with HFC-407C is applied, please contact our local office.
3. *The capacity control can be at 100-63%, or 100-37%.
4 **The capacity control can be at 100-81-50-31%, 100-69-38-19% or 100-81-62-31%.
Water Pressure Drop
70
60
50
40
30
20
10
A: YCAB100SC/100RC/100SB
B: YCAB130SC/130RC/130SB
C: YCAB160SC/150RC/160SB
D: YCAB210SC/270SC/330SC
YCAB210SB/270SB/330SB
YCAB200RC/250RC
4
(Y-axis for water pressure drop and X-axis for water flow)

Dimensions
YCAB100SC, YCAB130SC, YCAB160SC, YCAB100SB, YCAB130SB,
YCAB160SB, YCAB100RC, YCAB130RC, YCAB150RC
YCAB210SC, YCAB270SC, YCAB330SC, YCAB210SB,
YCAB270SB, YCAB330SB, YCAB200RC, YCAB250RC
(See note 4)
Note:
1. To avoid the return flow of the condenser and operating faults, Johnson Controls
recommends the minimum distances as follows:
side face to wall: 1525mm rear face to wall: 2450mm
front face to wall: 2450mm top distance: 15000mm
distances between immediate units: 3600mm
If the above distances cannot be met, the unit performance may be impacted or the unit
may abnormally shut down.
No wall should be higher than the top of unit.
To avoid blocking the ventilation of the unit air, there should not be any obstacles inside the
above distances or under the unit. If the unit needs to operate in winter of snow cases, the
mounting height must be increased to assure that the condenser air flows property.
2. Mounting dampening springs will heighten the unit by 135mm overall.
3. The diagrams are schematics, and are not to scale.
4. YCAB330 unit height is 2418mm, and other model’s height is 2358mm.
5

Cooling Performance
6
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Heating Performance
The above table is based on the following:
1. Input power (kW) is for compressor and fan.
2. Water flow is the same as the flow under the standard operating condition (refer to the table on page 4).
3. If unit with HFC-407C is applied, please contact our local office.
7

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