McQuay MAC060D4 Instruction manual

Air Cooled Chiller
Models: MAC060/090/120D4
Contents
INSTALLATION, OPERATION & MAINTENANCE MANUAL

©2009McQuay
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MAC0906-V2
Part No.: M08019320011
1. Introduction
Introduction……………………………………………………………………………………………………3
Nomenclature ………………………………………………………………………………………………3
2. Features
General Specification………………………………………………………………………………………6
Parameter……………………………………………………………………………………………………7
Performance Chart……………………………………………………………………………………………8
Outlines And Dimensions …………………………………………………………………………………11
Operation Limit………………………………………………………………………………………………13
3. Installation
Unit Installation ………………………………………………………………………………………14
Water System Installation ……………………………………………………………………………16
Power Connection …………………………………………………………………………………………20
4. Servicing and Maintenance
Servicing and Maintenance ………………………………………………………………………………21
Troubleshooting and Solution ……………………………………………………………………………22
Schematic Diagram ………………………………………………………………………………………27
5. Notice
Notice ………………………………………………………………………………………………………28

©2009McQuay
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"McQuay" is a registered trademark of McQuay International.
All rights reserved throughout the world.
©2009 McQuay International
"Bulletin illustrations cover the general appearance of McQuay International products at the time of
publication and we reserve the right to make changes in design and construction at any time without
notice."
Installation and maintenance are to be performed only by qualified personnel who are familiar with
local codes and regulations, and experienced with this type of equipment.
McQuay is not responsible for any unit damage, personal injury or death due to not complying with
these requirements.
Caution
!
Warnin
g
Sharp edges and coil surfaces are a potential injury hazard. Avoid contact with them.
!
It is not allowed to install the unit in public area.
Warnin
g
!
A fit Air-switch should be installed in the main electrical wire when the unit connects with electric
net system.
Moving machinery and electrical power is hazardous. It may cause severe personal injury o
r
death. Disconnect and lock off the Air-switch or power before servicing equipment.
Warnin
g
!

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1 Introduction
Introduction
For years, McQuay international has earned a reputation for providing the industry with various
highest quality and most technologically advanced air conditioning systems. Now Shenzhen McQuay is
proud to introduce the new generation air-cooled chiller-MAC D series. Inherited from the advantage of
the earlier product experiences and introduced the most up-to-date technology, the new MAC D series is
designed with the always-in-mind concept - to satisfy customers’ high efficiency, comfort, safety,
intelligence requirements to maximum extent. The unit can be flexibly coupled with multi fan coil units,
easily operated with artificial intelligence, additionally combined with indoor top level decoration, these
altogether bring you to enjoy the nobility coming from central air conditioning.
Nomenclature
MAC 060 D 4 - P AA M
Refrigerant type: 4:R407C Default for R22
Air Cooled Chiller
Cooling capacity
Design series
Market code
Description of the unit
Power supply feature: P for 208-230V/3～ /60Hz
Mcquay

©2009McQuay
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2 Features
Superior Performance
Extensive research work coupled with world leading manufacturing technology has resulted the new
design with superb performance and high efficiency.
Stringent quality control and component selection ensure performance and reliability. Major components
are rigorously tested and qualified prior to usage in the machine.
Every machine design has passed many hours of rigorous testing to ensure the machine reliability,
durability and quality.
Scroll compressor brings much higher energy efficiency. High efficiency heat exchanger ensures
strenuous exertion of equipment capacity. Water pump particularly designed for air conditioning
engineering is operating steadily with minimum vibration and noise.
These units are designed with double independent refrigerating system, greater energy saving is
achieved by only one compressor on duty under part load condition.
Robust Construction with Slim Outlook
Detailed engineering work coupled with extensive market research has resulted the new MAC model
come in new mono-block design to yield a compact and robust structure while maintaining the slim
outlook. The smaller capacity models MAC060D4 are having side discharge design, while the larger
capacity models MAC090/120D4 are having top discharge design.
Simple to Operate
The machine is complete with intelligent microprocessor controller and temperature sensor to
automatically control the operation to its optimum condition, making it very simple to operate. All
temperature settings are finished before shipment. The only thing for user to do is to start the unit by
pressing the ON/OFF button after ensuring unit proper function, then every operation can be
automatically performed by the unit itself.
Either wireless remote controller or wired remote controller is ready for choosing to meet satisfactory
indoor unit control, both compatible with the unit.
Friendly Installation
The machine has been designed with installation friendly in mind such that no refrigeration charging or
copper pipe brazing is required on site.
Threaded fitting is provided for easy water piping connection on site.
Taper threaded fittings target convenient disassembly or assembly.
Expansion chamber, water pump and water pressure differential switch is already equipped in this
compact packaged unit. In addition, McQuay provides accessory hydraulic kit with water storage tank,
auto water fill valve, auto air vent valve, auto pressure relief valve and strainer integrated in, aiming at
ensuring high efficiency and safe operation.

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Safety Control
Protection devices such as dual pressure protection and overload protection etc. is provided to ensure
unit operating within safety condition range. The microprocessor-based controller automatically directs
system on or off by processing the water temperature feedback. If the water temperature falls to
unacceptable low point, the controller automatically shut off the system to prevent hydraulic system
internal freeze for unit safety operation. Meanwhile, the microprocessor-based controller automatically
monitors every component operating status and malfunction, and feedback it to indoor controller to
greatly ease the work of status monitor and troubleshooting.
All Weather
The cabinet is made of electro galvanized mild steel sheet, coated with baked polyester power to ensure
the units extra durability in all climates against sun, rain, wind corrosion.
Space saving (small footprint) design of the machine eliminates large installation area requirement, no
need for equipment room.
The machine uses high quality parts to ensure durability in various climate conditions.
Simple to Maintain
The simple design of the machine allows for maximum serviceability. All components are with reach of
the maintenance personnel upon open up of the servicing panel. If emergency shutoff occurs, the
microprocessor-based controller will indicates the fault cause to quicken and ease troubleshooting.

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General Specification
Compressor
McQuay Mini Chillers are equipped with highly efficient, reliable and silence scroll compressors for
MAC060/090/120D4
Air-Cooler Condenser
The air-cooled condenser coil consists of staggered rows of 3/8’’ OD seamless copper tube,
mechanically expanded into die formed aluminum fins to ensure optimum heat exchange capability.
Condenser Fan Motor
To achieve the high air change requirement, the unit is equipped with high airflow propeller fan. The fan
is directly driven by weather proof motor to ensure reliable continuos operation.
Evaporator
The heat exchanger is made of stainless steel plates closely arranged and brazed together to ensure
high heat exchange efficiency. The complete heat exchanger is insulated with thermal closed cell nitric
rubber foam to give optimum thermal insulation.
Refrigerant Circuit
The refrigerant circuit is brazed and vacuumized in factory before accurately charged with R407C to
ensure optimum operating requirement, to ensure flawless continuous operation.
Additional Safety Protection
The units are equipped with intelligently designed safety control to ensure continuous safe operation.
Pressure switch and sensor is provided to prevent the compressor damage, resulting from both
abnormal high discharge pressure and low pressure due to insufficient gas.
The standard electronic controller provides accurate water temperature control in the circuit by closely
monitoring and reacting to the input from the water entering temperature, water leaving temperature and
ambient air temperature.
Pressure difference switch is provided in the unit to protect against lack of water flow.
During abnormal condition, the electronic controller will turn the unit off and the then display the faulty of
operation. (Refer to Troubleshooting sheet)

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Parameter
MODEL MAC060D4 MAC090D4 MAC120D4
NOMINAL COOLING CAPACITY W17500 30000 33500
POWER SUPPLY 208-230V/3～/60Hz
REFRIGERANT TYPE R407C
RATED COOLING POWER INPUT W6000 10100 10600
RATED COOLING CURRENT A18.8 34.7 35.7
TYPE/DRIVE Propeller/Direct
RATED POWER INPUT W360 1000 1000 FAN MOTOR
RATED CURRENT A1.6 3.7 3.7
TYPE Horizontal Multistage End-Suction
RATED POWER INPUT W1410 1410 1410
RATED CURRENT A3.4 3.4 3.4
PUMP
AVAILABLE HEAD m20.0 16.5 14.0
WATER FLOW RATE m3/h 2.71 4.65 5.19
UNIT WATER PRESSURE DROP kPa 95.5 100.5 110.0
HEIGHT(H) 1700 1840 1840
WIDTH (W) 1212 840 840
TOTAL UNIT
DIMENSION DEPTH (D)
mm
502 990 1290
INSTALLATION WATER PIPE CONNECTION Rc 1 Rc 1 1/2
CONDENSER TYPE Cross Aluminum Finned Seamless Copper Tubes
EVAPORATOR TYPE Stainless Steel Brazed Plate Heat Exchanger
SOUND LEVEL dB(A) 62 66 66
NET WEIGHT kg 215 270 312
Notes:
1) All specifications are subjected to change by manufacturer without prior notice.
2) Nominal cooling parameters are based on leaving water temperature 6.7℃, ambient temperature 35℃and 0.043 l/s per
kW water flow factor.
3) Rated cooling power input doesn’t include the pump consumption.
4) Actual performance can be determined by conducting correction after looking up the following charts.
Based on the ambient temperature and required return water temperature, we can locate the corresponding performance
factor in these charts, then the corresponding actual cooling (heating) capacity and power input can be determined by
using the performance chart.

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Performance Chart
Cooling Capacity Performance Chart
LWT : Leaving Water Temperature
MAC060D4
10.0
15.0
20.0
25.0
30.0
15℃20℃25℃30℃35℃40℃45℃48℃
Ambient Temperature(℃)
Cooling Capacity(kW)
LWT
(
℃
)
MAC090D4
20.0
25.0
30.0
35.0
40.0
45.0
15℃20℃25℃30℃35℃40℃45℃48℃
Ambient Temperature(℃)
Cooling Capacity(kW)
15℃
12℃
9℃
7℃
5℃
LWT
(
℃
)
15℃
12℃
9℃
7℃
5℃

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Cooling Power Input Char
LWT : Leaving Water Temperature
LWT
MAC120D4
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
15℃20℃25℃30℃35℃40℃45℃48℃
Ambient Temperature(℃)
Cooling Capacity(kW)
15℃
12℃
9℃
7℃
5℃
LWT
(
℃
)
MAC060D4
3.50
4.50
5.50
6.50
7.50
8.50
15℃20℃25℃30℃35℃40℃45℃48℃
Ambient Temperature(℃)
Cooling Power Input(kW)
LWT
(
℃
)
15℃
12℃
9℃
7℃
5℃
15℃
12℃
9℃
7℃
5℃