Magnitude™ Magnetic Bearing Centrifugal Chillers Catalog 602-2
Model WMC • 145 to 400 tons • 500 to 1400 kW • R-134a
Engineered for flexibility and performance™
Cutaway View of Magnetic Bearing Compressor
Compressor Major Running Gear Components
MicroTech II® Controller Operator Interface, Home Screen
Table of Contents
The New Compressor Technology ....................................................................................................................... 4
Benefit Summary............................................................................................................................................ 4
The Compressor Technology.......................................................................................................................... 5
Low Operating Costs...................................................................................................................................... 6
Environmental Responsibility ........................................................................................................................ 6
Unit Control Features ..................................................................................................................................... 7
MicroTech II ® Control Features and Benefits................................................................................................ 8
Unit Design Features........................................................................................................................................... 12
Chiller Identification........................................................................................................................................... 16
Sound Data .......................................................................................................................................................... 17
One-Third Octave Band ............................................................................................................................... 17
Dimensions........................................................................................................................................................... 19
Marine Water Box Dimensions .................................................................................................................... 25
Physical Data and Weights................................................................................................................................. 27
Physical Data ................................................................................................................................................ 28
Relief Valves......................................................................................................................................................... 29
Electrical Data ..................................................................................................................................................... 30
Application Considerations ................................................................................................................................ 41
Location........................................................................................................................................................ 41
Optimum Water Temperatures and Flow ...................................................................................................... 41
System Water Volume................................................................................................................................... 43
Pump Control................................................................................................................................................ 43
Retrofit Knockdown ..................................................................................................................................... 44
Pressure Drop Curves ................................................................................................................................... 45
Options and Accessories ..................................................................................................................................... 48
Refrigerant Recovery Units................................................................................................................................ 50
Refrigerant Monitors.......................................................................................................................................... 51
Specifications ....................................................................................................................................................... 53
Modbus™
Applies to 60 HZ only
Applies to 60 HZ only
*Unit Controllers are LONMARK certified with an optional LONWORKS communication module.
Document:
Original Issue Date:
Revision Issue Date:
Replaces:
Software Version
Catalog 602-2
February 2009
February 2012
November 20111
V07.91
Manufactured in an ISO Certified Facility
©2012 McQuay International. Illustrations and data cover the McQuay International product at the time of publication and we reserve the
right to make changes in design and construction at anytime without notice. ™® The following are trademarks or registered trademarks of
their respective companies: BACnet from ASHRAE; LONMARK, LonTalk, LONWORKS, and the LONMARK logo are managed, granted and
used by LONMARK International under a license granted by Echelon Corporation; Modbus from Schneider Electric; MicroTech II, Open
Choices from McQuay International.
Catalog 602-2
3
The New Compressor Technology
For Magnitude™ Model WME see Catalog 604

management system. With no oil to coat the heat
transfer surfaces, a gain in heat exchanger
efficiency can be realized.
Ultra Quiet A compressor sound level as low as
76 dBA, with virtually no structure-borne
vibration, eliminates the need for expensive sound
attenuation accessories.

Sustainable Performance All oil-lubricated
Next Generation Centrifugal Here Today
The industry’s next generation of centrifugal chillers is
here today with Daikin McQuay Magnitude chillers.
The new technology begins with centrifugal
compressors utilizing frictionless magnetic bearings
for oil-free operation, integral variable-frequency
drives, and high-speed direct drive technology. The
high efficiency compressor is matched with highly
efficient heat exchanges to make an impressive chiller.
The control system is based on Daikin McQuay’s
MicroTech II family to provide the optimum chiller
control system. We invite you to look at how the
features and benefits compare to older compressor
technologies.
Benefit Summary

Highest Efficiency- in its size range; as low as
0.328 kW/ton.

4
Increased Reliability This frictionless
magnetic bearing design needs no oil

chillers will deposit oil on heat transfer surfaces
and eventually lose some efficiency. Since the
Magnitude chiller uses a positive pressure
refrigerant (HFC 134a) and has no oil, its
industry-leading efficiency is maintained for the
life of the chiller. Additionally, over time
negative pressure chillers (such as those using
HCFC 123) may draw air and moisture into the
system, which can significantly increase energy
consumption.
Smart refrigerant choice The compressor is
optimized for HFC 134a, the positive pressure
refrigerant with no phase-out schedule and no
ozone depletion.
Catalog 602-2

Smart controls Onboard digital electronics

provide smart controls. The compressor is
totally self-correcting and incorporates a
system of sophisticated self-diagnostics,
monitoring and controls.
Safe power interruption In the event of a
power failure, the compressor motor acts as a
generator, providing power for the bearing
control system during coast down. It also has a
system to gently de-levitate the shaft.
The Compressor Technology
The advanced, magnetic bearing, permanent
magnet synchronous motor technology used in
Magnitude chillers offers many owner benefits.
Figure 1, Compressor Cutaway
1. Magnetic Bearings and
2.
3.
4.
5.
6.
Bearing Sensors
Permanent Magnet
Synchronous Motor
Touchdown Bearings
Shaft and Impellers
Compressor Cooling
VFD
VFD = Ultra-Low IPLV
The well-proven energy performance advantages
of large central plant type variable-speed
centrifugal chiller compressors now benefit
mainstream, middle-market applications through
the use of high-speed, centrifugal compression
with integral variable-speed drive.
The compressor speed reduces as the condensing
temperature and/or cooling load reduces,
optimizing energy performance through the entire
operating range. Movable inlet guide vanes
redirect gas flow into the first stage impeller
during low loads, after the compressor has reached
minimum speed.
Ultra-Smart Controls
The chillers utilize digital control electronics to
proactively manage unit operation and providing
control of external chilled water and cooling tower
pumps.
Catalog 602-2
Greater Reliability
Oil Handling Equipment Removed
With magnetic bearings operating in a magnetic
electrical field instead of oil lubricated ball or roller
friction type bearings as the basis of design, the oil
handling equipment is removed.
Oil-Free Design Benefits
Totally Oil-Free Operation = Greater Efficiency
With no oil to coat the heat transfer surfaces, a gain in
heat exchanger efficiency can be realized.
No Oil Loss = Sustainable Performance
With no possibility of oil loss at light loads or due to worn
seals, the original energy saving efficiency can be
maintained for the life of the chiller.
No Oil Handling Equipment = Greater Reliability
With magnetic bearings operating in a magnetic electrical
field instead of oil-lubricated bearings, the oil handling
equipment is removed. No need for:
oil pumps
oil reservoirs
oil coolers
oil filters
water regulating valves
oil relief valves
oil system controls, starter, piping, heaters, etc...
that are needed to maintain oil quality. These devices can
be a fault source in traditional chillers, and removing
them significantly increases unit and system reliability.
No Oil System = Reduced Maintenance Costs
With oil removed from the system, oil samples, oil
changes, oil system maintenance, oil filter changes and
leaks are eliminated.
5
Exceptional Control
Low Operating Costs
User-Friendly Touch Screen Panel
Shrink Your Utility Costs with Ultra
Efficient Part-Load Performance
Every Magnitude chiller is provided with the userfriendly operator interface touch screen panel
mounted on the moveable positioning arm for easy
viewing and operation.
View chiller status, clear faults and change
parameters by merely touching the screen.
For added convenience, the unit operating and
maintenance manual is viewable on the screen and
can be downloaded and printed via the USB port
located in the control panel.
The Magnitude chiller Integrated
Part Load Value (IPLV) is as low
as 0.328 kW/Ton. Compare this
with most screw compressor
chillers - approximately 0.575
kW/Ton. There is a potential for
up to 40% energy savings at part
load compared to other chillers.
Virtually Eliminate Maintenance Costs
Oil samples, oil change-outs,
oil system maintenance, oil
filter changes are eliminated.
The bearing system, shafting
and impellers are shown
here.
Environmental Responsibility
Long Term Refrigerant Solution
Flexible BAS Interface Modules
Every Magnitude chiller with MicroTech®II
controls and the Open Choices™ feature can be
provided with LONWORKS, BACnet, or
Modbus communications modules for an easy, low
cost connection to the building automation system of
your choice. Expensive and complex interface
gateways are not required.
The Magnitude chiller uses R-134a refrigerant,
which does not have a phase-out date and does not
attack the ozone layer.
Ultra Quiet Sound Levels
Modules can also be easily retrofitted after
installation.
Variable Frequency Drives
Compressor unloading and subsequent chiller
capacity reduction is accomplished by a
compressor-mounted variable frequency drive. It
operates in conjunction with the inlet guide vanes.
The VFDs are a key factor in providing the
tremendous energy savings at part load operation.
Seismic Certification Option
WMC units are OSHPD Pre-Approved and so
labeled. (California only).
WMC units are certified to IBC 2009 and so
labeled.
6
The Magnitude chiller is the quietest chiller in the
industry for its size range. It is perfect for sound
sensitive applications. See published ratings on page
17.
The best way to appreciate how quiet these units are
is to hear one operate. It is important to compare the
sound data in this catalog to other offerings.
Remember that a sound pressure difference of only
two to three dBA is a very noticeable difference. A
number of owners have asked for a large indicating
light on the unit so they can tell when it’s on!
Catalog 602-2
Extremely Low Vibration Levels
As a result of the magnetic bearings and low
inertia design, the compressor vibration levels are
extremely low, minimizing vibration that could be
transmitted to the structure.
The unit is shipped with rubber mounting pads and
spring vibration isolators are not required.
enhancements not found in any other unit controller
system on the market today. MicroTech controller's
innovative design will help keep your chiller
running efficiently . . . day in, day out, for years to
come.
Control Architecture
The Magnitude chiller takes advantage of McQuay
International’s 30 years of experience in designing
and manufacturing the highly regarded WDC line
of conventional, dual centrifugal compressor
chillers.
The operator interface panel is a 15-inch Super
VGA touch-screen, utilizing graphics to provide
clear and concise information on the chiller status,
(see page 9) alarms, trends, and setpoint adjustment.
Should the touch-screen become inoperable, the
unit controller will continue uninterrupted operation
of the chiller.
Unit Control Features
Magnitude Chillers Feature MicroTech
It is only fitting that the world’s most
revolutionary chiller design be matched with the
advanced Daikin McQuay MicroTech control
technology to give you the ultimate in chiller
performance and control. The control includes
many energy-saving features and interface
Catalog 602-2
The controller minds those functions that are
common to the chiller as a whole (pumps, cooling
tower, valves, etc.) and is the interface point for
BAS connection and other control inputs to the
chiller, as well as outputs such as operation of the
electronic expansion valve.
The control panel contains a USB port for
downloading the unit’s fault history, major
parameter trends, and the unit operating manual that
is stored in the microprocessor.
7
MicroTech II ® Control Features and Benefits
FEATURE
BENEFIT
Easy integration into Building Automation System
(BAS) via the exclusive Open Choice™
communication module
Designer can select any BAS supplier using standard
open protocols and know the MicroTech II control will
interface with it.
Easy to read, adjustable, 15 inch, Super VGA color
touch screen operator interface
Operators can observe chiller operation and easily
select various data screens and change setpoints
Historic trend data-downloadable
Water temperatures, refrigerant pressures, and motor
load plots can provide valuable information for energy
conservation
Precise  0.2 F chilled water control
Provides stability in chilled water system
Proactive pre-shutdown correction of “unusual
conditions” allows chiller to stay online
Activates alarm and modifies chiller operation to
provide maximum possible cooling
Automatic control of chilled water and condenser
water pumps
Integrated lead/lag and automatic engagement of
backup pump
Controls up to four stages of tower fans and
modulation of tower fan and/or bypass valve
Optimum integrated, efficient, control of cooling tower
water based on system conditions
Twenty-five previous alarm descriptions are stored
in memory
Valuable asset for trouble shooting
Onboard operating and maintenance manual
Information instantly available (downloadable)
Up to four WMC chillers* can be interconnected
for coordinated operation
Simplifies multi-chiller installations
Designed with the Operator in Mind
Reliable, economic use of any chiller depends
largely on an easy operator interface. That’s why
operation simplicity was one of the main
considerations in the development of the
MicroTech controller. The operator’s interface
with the chiller is through a 15-inch, Super VGA
color monitor with touch-screen capability. The
operator can clearly see the entire chiller
graphically displayed with the key operating
parameters viewable on the screen. Pressing a
single on-screen button will access the set screens
where setpoints can be reviewed and changed, if
necessary. Other screens, such as alarm history,
are easily accessed through touch screen buttons.
See the following page for some typical screens.
By constantly monitoring chiller status, the
MicroTech controller will automatically take
proactive measures to relieve abnormal conditions
or shut the unit down if a fault occurs. For
example, if a problem occurs in the cooling tower
and discharge pressure starts to rise, the controller
will automatically hold the load point and activate
an alarm signal. A further rise in pressure will
initiate compressor unloading in an effort to
8
maintain the setpoint pressure and stay online. If
the pressure continues to rise, the unit will shut off
at the cutout pressure setting.
The MicroTech controller's memory retains a
record of faults and the time/date stamp. The
controller's memory (no batteries required) can
retain and display the cause of the current fault and
the last twenty-five fault conditions. This method
for retaining the fault is extremely useful for
trouble shooting and maintaining an accurate
record of unit performance and history. The
controller features a two-level password security
system to provide protection against unauthorized
use.
The Home Screen shown in Figure 2 is usually
used as the primary viewing screen. It provides real
time data on unit status, water temperatures, chilled
water set point and motor amp draw. In other
words, it very clearly answers the vital question: is
the chiller doing what it is supposed to do?
*Note: WMC B-vintage chillers may not be interconnected with any
other model, including WMC A-vintage models. See IM 1029-2 for
more information.
Catalog 602-2
Figure 2, MicroTech II Home Screen
The Daikin McQuay MicroTech controller can
record and plot water temperatures, refrigerant
pressures, and motor load in order to trend
performance. These values can also be downloaded
through a convenient USB port in the control
panel, and exported into a spreadsheet for further
evaluation and record purposes.
Figure 4, Trend Logging Screen
If an alarm occurs, a red button appears on the
screen (a remote signal is also available). Pressing
this button immediately accesses the Active Fault
Screen that gives complete fault information. The
problem can be fixed and the fault can be quickly
and easily cleared at this point.
Changing Setpoints
The mystery of changing set points is a thing of the
past. Look at how easy the job becomes with the
Daikin McQuay MicroTech. For example, to
change the chilled water set point, press SET from
any screen, then press the WATER button and this
screen appears, press button #1, Leaving Water
Temperature, and you are ready to input a new
value. Selected setpoints can also be changed by
the BAS.
Figure 3, MicroTech II Setpoints Screen
Trend Logging
Ever wonder how your chiller performed last
week? Were you holding the required chilled water
temperature? What kind of cooling load did the
chiller have?
Catalog 602-2
MicroTech Controller Increases Chiller
Operating Economy
Many standard features have been incorporated
into MicroTech control in order to maintain the
operating economy of Daikin McQuay centrifugal
chillers. In addition to replacing normal relay logic
circuits, we’ve enhanced the controller's energy
saving capabilities with the following features:

Direct control of water pumps. Optically
isolated, digital output relays provide
automatic lead-lag of the evaporator and
condenser pumps, permitting pump operation
only when required.

User-programmable compressor soft loading.
Prevents excessive power draw during pull
down from high unoccupied chilled water
temperature conditions.

Chilled-water reset. Accomplished directly on
the unit by resetting the leaving water
temperature based on the return water
temperature. A remote 4-20 ma or 1-5 VDC
BAS signal can also be used to reset the
leaving water. Raising the chilled water
setpoint during periods of light loads
dramatically reduces electrical consumption.
9




Demand limit control. Maximum motor current
draw can be set on the panel, or can be adjusted
from a remote 4-20 ma or 1-5 VDC BAS
signal. This feature controls maximum demand
charges during high usage periods.
Condenser water temperature control. Capable
of four stages of tower fan control plus an
optional analog control of either a three-way
tower-bypass valve or variable speed tower-fan
motor. Stages are controlled from condenserwater temperature. The three-way valve can be
controlled to a different water temperature or
track the current tower stage. This allows
optimum chilled water plant performance based
upon specific job requirements.
Staging Options (Multiple Chiller
Installations). Lead-lag and load-balance: the
MicroTech II controller is capable of
compressor lead-lag decisions and balancing
compressor loads between two compressors on
one unit or two separate Magnitude chillers,
using defaults or operator defined staging. For
example, in the 30 to 60 percent load segment,
one compressor running on each of two chillers
will provide better efficiency than two
compressors running on one chiller.
Plotting Historic Trends. Past operation of the
chiller can be plotted as trend lines and even
downloaded to spread sheets for evaluation - a
valuable tool for optimizing efficiency.
Versatile Communications Capabilities
Give You Even More Control
For complete flexibility there are four ways to
interface with the MicroTech II controller:
10
1. Direct entry and readout locally at the operator
interface panel on the unit.
2. Direct entry as above plus digital and analog
input/output signals for certain functions such
as: enable run input, alarm signal output, 4-20
ma or 0-5 VDC inputs for chilled water reset
and load limiting, pump and tower fan control,
analog output for variable speed fan and tower
bypass.
3. Interface with BACnet, LONWORKS, or
Modbus.
4. Direct communication between three
Magnitude WMC chillers (not compatible with
WME models).
Building Automation Systems
All MicroTech II controllers are capable of
communications providing seamless integration
and comprehensive monitoring, control, and twoway data exchange with industry standard
protocols LonTalk® or BACnet or Modbus.
Open Choice Benefits







Easy to integrate into your building automation
system supplier of choice
Factory- or field-installed communications
module
Provides efficient equipment operation
Integrated control logic for factory options
Easy-to-use local user interface
Owner/designer can select the BAS that best
meets building requirements
Comprehensive data exchange
Catalog 602-2
Figure 5, Sample System Architecture
Table 1, Typical Data Point Availability
Typical Data Points1 (W = Write, R = Read)
Capacity Limit Output
Capacity Limit Setpoint
Chiller Enable
Chiller Limited
Chiller Local/Remote
Chiller Mode Output
Chiller Mode Setpoint
Chiller On/Off
Chiller Status
Compressor Discharge Temp
Compressor Percent RLA
Compressor Run Hours
Compressor Select
Compressor Starts
R
W
W
R
R
R
W
R
R
R
R
R
W
R
Cond EWT
Cond Flow Switch Status
Cond LWT
Cond Pump Run Hours
Cond Refrigerant Pressure
Cond Sat. Refrigerant Temp
Cond Water Pump Status
Evap EWT
Evap Flow Switch Status
Evap LWT for Unit
Evap LWT for Compressor
Evap Pump Run Hours
Evap Refrigerant Pressure
Evap Sat. Refrigerant Temp
R
R
R
R
R
R
R
R
R
R
R
R
R
R
Evap Water Pump Status
Pump Select
Run Enabled
Liquid Line Refrigerant Pressure
Liquid Line Refrigerant Temp
Maximum Send Time
Minimum Send Time
Network Clear Alarm
Cool Setpoint
Current Alarm
Default Values
Active Setpoint
Actual Capacity
Compressor Suction Line Temp
R
W
R
R
R
W
R
W
W
R
W
R
R
R
Notes: Data points available are dependent upon options selected
Network Protocol Options
BACnet MS/TP
BACnet IP
BACnet Ethernet
Catalog 602-2
LonTalk (FTT-10A)
Modbus RTU
11
Unit Design Features
Variable Frequency Drive
Efficiency: The standard variable frequency drive
is a technology that has been used for decades to
control motor speed on a wide variety of motordrive applications. When applied to centrifugal
compressor motors, significant gains in part load
performance can be realized. The improvement in
efficiency and reduction of annual energy cost is
maximized when there are long periods of part
load operation, combined with low compressor lift
(lower condenser water temperatures).
The attributes of VFD and the compressor
technology produces one of the industry's most
efficient chiller based on the all-important IPLV
value. See “IPLV/NPLV Defined” on page 14 for
details on the AHRI IPLV efficiency rating.
Starting Inrush: The use of a VFD on centrifugal
chillers also provides an excellent method of
reducing motor starting inrush-even better than
"solid state" starters. Starting current can be
closely controlled since both the frequency and
voltage are regulated. This can be an important
benefit to a building's electrical distribution
system. The low inrush feature, combined with two
one-half size compressors having a staggered start,
is particularly attractive where chillers will be
asked to operate on emergency generators. Since
inrush has much to do with sizing the generators,
much smaller generators can be used.
HFC-134a
Daikin McQuay Positive Pressure Design:

No Purge

No Vacuum Prevention System

No Contaminants
HFC-134a operates above atmospheric pressure in
the entire refrigerant circuit and at normal
temperatures. All Daikin McQuay centrifugal
chillers use a positive pressure refrigerant, with the
following benefits:




12
No absorption of impurities into the refrigerant
circuit
No breakdown of motor insulation, refrigerant
or lubricant
No increase in operating cost due to
displacement of heat transfer surface by noncondensables
No crevice corrosion and tube failure due to
moisture in the system



No annual service expense to maintain and
rebuild purge unit
No abnormal annual service expense for oil,
filter, and refrigerant replacement
No periodic emissions of refrigerant into the
atmosphere
Heat Exchangers
Daikin McQuay Magnitude chillers are equipped
with high performance heat exchangers. The
unique design greatly increases heat transfer and
reduces unit footprint and refrigerant charge.
Vessels are designed, constructed and tested in
accordance with ASME Section VIII, ASHRAE
Standard 15 requirements and TEMA
recommendations.
The replaceable water tubes are internally rifled
and externally enhanced copper, and are
mechanically bonded to steel tube sheets. Standard
tubes are 0.025-inch wall thickness. Consult
factory for other options.
Vessels are available for 1, 2 or 3 pass water flow.
A 3/4" or 1-1/2 thick layer of vinyl/nitrate polymer
evaporator insulation is optional. All seams are
glued to form an effective vapor barrier. Detailed
information on the insulation can be found under
“Physical Data” on page 27.
Pumpdown
Pumpout systems provide a means to collect and
contain the refrigerant charge without loss when
access to internal chiller components is required
for service.
Daikin McQuay condensers and evaporators are
sized to hold the entire unit refrigerant charge
when not more than 90% full and at 90°F (32°C)
ambient temperature. They are equipped with
valves in the compressor discharge lines, suction
lines, and in the liquid line. These valves, coupled
with the vessel design, satisfy the stringent
requirements of the U.S. Department of
Transportation for refrigerant shipping containers,
as well as ASME vessel codes. When service is
required, the refrigerant charge can be pumped
down into either the condenser or evaporator by
compressor operation and use of a refrigerant
transfer unit.
Elimination of the cost and space requirements of
an external pumpout system on most jobs is a
major Daikin McQuay advantage.
Catalog 602-2
Electronic Expansion Valve
Controlled refrigerant flow over the entire capacity
range saves energy and dollars. Cooling loads and
condenser water temperatures can change
constantly. On Magnitude chillers, a modern
electronic expansion valve meters refrigerant flow
in direct response to the unit controller input,
which looks at unit kW and lift (discharge minus
suction pressure) to set the valve position. The
controller then balances suction superheat and
liquid subcooling to reach the optimum efficiency,
regardless of changing load or condensing
temperatures. In doing so, full utilization of
compressor, evaporator, and condenser efficiency
over the entire operating range is achieved.
Flow Switch
All chiller units must be provided with flow
switches for the evaporator and condenser. Daikin
McQuay furnishes factory-installed and wired,
thermal dispersion-type flow switches as standard
equipment on Magnitude chillers. This eliminates
the expense of field mounting and wiring
conventional paddle or differential pressure
switches.
The flow switches
prevent the unit
from starting
without sufficient
water flow through
the vessels. They
also serve to shut
down the unit in
the event that
water flow is
interrupted to
guard against evaporator freeze-up or excessive
discharge pressure.
Additionally, for a higher margin of protection,
normally open auxiliary contacts in the pump
starters can be wired in series with the flow switches
as shown in the Field Wiring Diagram.
Factory Performance Test
Fast and trouble free startup and operation.
All Daikin McQuay centrifugal chillers are factorytested on AHRI qualified microprocessor-controlled
test stands. The test stand microprocessors interface
with the chiller MicroTech controls, allowing
monitoring of all aspects of the test stand and chiller
operation.
The test procedure starts with dehydration and
evacuation of the refrigerant circuit and charging
with refrigerant. This is followed by a run test at job
Catalog 602-2
conditions of flow and temperature. Compressors
must meet a stringent vibration limit and the entire
unit must pass a moisture limit of 30 ppm.
The testing helps ensure correct operation prior to
shipment and allows factory calibration of chiller
operating controls.
Optional Certified Test
A factory engineer oversees the testing, certifies the
accuracy of the computerized results, and translates
the test data onto an easy-to-read spreadsheet. The
tests are run to AHRI tolerance of capacity and
power. 50 Hertz units are tested using an on-site 50
Hertz generator.
Optional Witness Test
A factory engineer oversees the testing in the
presence of the customer or their designate and
translates the test data onto an easy-to-read
spreadsheet. Tests are run to AHRI tolerances of
capacity and power. 50 Hertz units are tested using
an on-site 50 Hertz generator.
McQuay Factory Service Startup
All Daikin McQuay centrifugal chillers are
commissioned by local McQuay Factory Service
personnel or by authorized McQuay startup
technicians. This procedure helps assure that proper
starting and checkout procedures are employed and
helps speed up the commissioning process.
Part Load Efficiency
According to ASHRAE, chillers usually spend
99% of their operating hours under part load
conditions and most of this time at less than 60%
of design capacity. One compressor of a dual
chiller operates with the full heat transfer surface
of the entire unit. For example, one 75-ton
compressor on a 150-ton dual chiller utilizes 150
tons of evaporator and condenser surface. This
results in very high unit efficiency and also
increases the compressor’s capacity.
The inclusion of VFDs, as standard, to the dual
compressor chiller can produce astonishing AHRI
Certified IPLVs, as low as 0.328 kW/ton. Specific
selections can vary from this example.
Compliance with ASHRAE Std. 90.1
With the Magnitude chiller capacity range of 145
to 400 tons, they fall into three ASHRAE Std. 90.1
efficiency groups and revisions.
13
Table 2, ASHRAE 90.1 Requirements (kW/ton)
Std. 90.1
Capacity
Range
Pre 2010
Starting in 2010
Full
IPLV
Load
Path A
Path B
Full
Full
IPLV
IPLV
LoadLoad-
 150 Tons 0.703 0.669 0.634 0.596 0.639
0.450
 150 Tons
0.634 0.596 0.634 0.596 0.639 0.450
 300 Tons
 300 Tons
0.576 0.549 0.576 0.549 0.600 0.400
 600 Tons
NOTE: Beginning in 2010, the 90.1 efficiency
requirements have been divided into two groups,
designated as Path A and Path B. Path B is a new
category created for units with VFD compressor drives
that by nature have superior part-load efficiencies. WMC
Magnitude chillers, with their built-in VFDs, fall into
Path B.
The Path B IPLV values for 2010 are about 30 percent
less than the 2007 equivalent values. Also beginning in
2010, the minimum efficiency values are formula derived
instead tabular so that they can take flows and
temperatures other than AHRI standard into account.
AHRI Certification
McQuay International has an on-going
commitment to supply chillers that perform as
specified. To this extent, Daikin McQuay
centrifugal chillers are part of the AHRI
Certification Program. On-going performance
verification of chiller capacity and power input
plus AHRI certified computerized selection output
provide the owner with specified performance in
accordance with the latest version of AHRI
Standard 550/590.
All chillers that fall within the scope of the
certification program have an AHRI certification
label at no cost to the owner. Equipment covered
by the AHRI certification program includes all
water-cooled centrifugal and screw water chilling
packages rated up to 2500 tons (8800 kW) at AHRI
standard rating conditions, hermetic or open drive,
with electric driven motor not exceeding 5000
volts, and cooling water (not glycol).
Published certified ratings verified through testing
by AHRI include:

Capacity, tons (kW)

Power, kW/ton (COP)

Pressure drops, ft. of water (kPa)

Integrated Part Load Value (IPLV) or NonStandard Part Load Value (NPLV)
manuals define certification and testing procedures
and performance tolerances of all units that fall
within the application rating conditions.
Leaving chilled water temp.: 40F to 48°F (44F
standard)
Entering condenser water temp.: 60F to 95°F
Leaving chilled water temp.: 44°F
Evap. waterside field fouling allowance: 0.0001
Chilled water flow rate: 2.4 gpm/ton
Entering condenser water temp.: 85°F
Condenser waterside field fouling allowance:
0.00025
Condenser water flow rate: 3.0 gpm/ton
IPLV/NPLV Defined
Part load performance can be presented in terms of
Integrated Part Load Value (IPLV), which is based
on AHRI standard rating conditions (listed above),
or Non-Standard Part Load Values (NPLV), which
is based on specified or job site conditions. IPLV
and NPLV are based on the following weighting
equation from AHRI 550/590:
Using kW/ton:
IPLVorNPLV =
1
0.01 0.42 0.45 0.12
+
+
+
A
B
C
D
Where:
A = kW/ton at 100%
B = kW/ton at 75%
C = kW/ton at 50%
D = kW/ton at 25%
Or, using COP values:
IPLVorNPLV = 0.01A + 0.42 B + 0.45C + 0.12 D
Where:
A = COP at 100%
B = COP at 75%
C = COP at 50%
D = COP at 25%
The AHRI Standard 550/590 for Centrifugal or
Screw Water-Chilling Packages and associated
14
Catalog 602-2
Weighting
The percent of annual hours of operation at the
four load points are as follows:
100% Load at 1%
75% Load at 42%
50% Load at 45%
25% Load at 12%
Note that the vast majority of hours are at the operating
range where dual compressor chillers excel.
Catalog 602-2
Tolerances
The AHRI test tolerance, per AHRI Standard
550/590-98, for capacity (tons), power input per
ton (kW/ton), and heat balance is:
1500


% Tolerance  10.5  (0.07 x % FL)  

 DTFLx % FL 
Where:
FL = Full Load
DTFL = Chilled Water Delta-T at Full Load
This formula results in a 5% tolerance on tons
and kW/ton at the 100% load point and AHRI
conditions.
15
Chiller Identification
Magnitude centrifugal chillers are selected by computer and identified by their components on the selection
printout as a Model #. The unit model code is as follows:
Figure 6, Chiller Identification
MODEL CODE EXAMPLE:
C
O
M
P
R
E
S
S
O
R
E
V
A
P
O
R
A
T
O
R
W M C - 150D - BS - 13R / E2212 - B E - 2 RA / C2012 - B L Y Y - 2 R A Y Y Y R 134
Packaged Water Cooled
M = Magnetic
Centrifugal Compressor Model
Unit Model Code
Vintage/Single Refrigerant Circuit
Motor/Voltage Code
Evaporator Shell Description
[Diameter (in.), Length (ft.)]
Tube Count Code
Tube Type Code
Number of Passes (1, 2, 3)
Water Inlet Location (R = Right Inlet; L = Left Inlet)
Connection Type
Condenser Shell Description [Diameter (in.), Length (ft.)]
Tube Count Code
C
O
N
D
Tube Type Code
Tube Count Code (Heat Recovery Condenser)
N/A
Tube Type Code (Heat Recovery Condenser)
E
N
S
E
R
Number of Passes (1, 2, 3)
Wate r Inlet Location (R = Right Inlet; L = Left Inlet)
Connection Type
Number of Passes (Heat Recovery Condenser)
Water Inlet Location (Heat Recovery Condenser)
N/A
Connection Type (Heat Recovery Condenser)
Motor Manufacturer
Refrigeration Type (134 = HFC-134a)
16
Catalog 602-2
Sound Data
The following sound pressure ratings are for
lowering of sound level as the units unload.
measurements one meter from the unit and in
Ratings are “A” weighted measured at one-meter
accordance with ANSI/AHRI Standard 575. The
from the unit. The 25 percent values are with one
ratings are for the various part loads shown and at
compressor running.
the center bands. Note that there is a considerable
Table 3, WMC 145S Sound Pressure (dB), 50/60 Hz
Percent
Load
63 Hz
37.0
39.5
37.0
38.0
100
75
50
25
125 Hz
50.0
49.0
47.5
50.0
250 Hz
61.0
60.5
60.0
58.0
Octave Band
500 Hz
1 kHz
67.0
74.5
66.0
72.5
64.5
66.5
66.5
68.5
2 kHz
71.5
69.0
68.0
70.0
4 kHz
73.0
71.0
69.5
69.5
8 kHz
75.5
72.0
68.0
70.0
2 kHz
70.0
64.5
61.0
60.5
4 kHz
66.5
64.0
58.5
57.5
8 kHz
64.0
60.0
53.5
52.0
2 kHz
72.5
69.5
66.0
66.0
4 kHz
76.5
74.0
71.5
69.5
8 kHz
75.0
70.5
66.0
64.0
2 kHz
76.0
76.5
74.5
73.0
4 kHz
80.0
79.0
77.5
73.0
8 kHz
74.5
72.5
70.0
62.0
A-Weighted
80.5
78.0
75.0
76.5
Table 4, WMC 145D/150D, Sound Pressure (dB), 50/60 Hz
Percent
Load
63 Hz
37.5
39.5
35.5
36.0
100
75
50
25
125 Hz
49.5
48.5
48.0
48.5
250 Hz
56.0
55.0
54.5
54.5
Octave Band
500 Hz
1 kHz
65.0
72.0
61.0
69.5
58.0
66.0
57.5
65.5
A-Weighted
75.5
72.5
68.5
68.0
Table 5, WMC 250D/290D, Sound Pressure (dB), 50/60 Hz
Percent
Load
63 Hz
37.5
37.0
37.5
37.5
100
75
50
25
125 Hz
51.5
50.5
50.0
49.0
250 Hz
59.5
62.5
60.0
59.0
Octave Band
500 Hz
1 kHz
72.0
75.0
66.5
70.0
65.0
65.5
63.0
65.0
A-Weighted
81.5
78.0
75.0
73.5
Table 6, WMC 400D, Sound Pressure (dB), 50/60 Hz
Percent
Load
63 Hz
46.0
45.5
45.0
44.5
100
75
50
25
125 Hz
55.5
55.5
54.5
51.5
250 Hz
65.5
65.5
64.0
61.0
Octave Band
500 Hz
1 kHz
70.5
74.5
69.5
73.5
69.0
71.0
64.5
67.5
A-Weighted
83.5
82.5
81.0
77.0
One-Third Octave Band
Table 7, WMC 145S, One-Third Octave Band Sound Ratings
Percent
Load
50 Hz
33.5
34.0
31.5
32.0
100
75
50
25
63 Hz
32.0
36.0
33.5
32.5
80 Hz
30.5
33.0
31.5
34.5
100 Hz
38.0
39.0
37.5
37.0
125 Hz
46.5
45.0
44.5
47.0
Octave Band
160 Hz 200 Hz 250 Hz
46.5
49.0
59.0
45.5
49.5
58.5
43.5
48.0
58.5
46.5
49.5
55.5
315 Hz
56.0
54.5
54.0
53.0
400 Hz
60.5
58.5
53.0
55.0
500 Hz
63.0
60.0
57.0
59.0
630 Hz
63.0
63.5
63.5
65.0
800 Hz
69.5
71.0
58.0
59.5
Table 7, continued
Percent
Load
Octave Band
1 kHz 1.25 kHz 1.6 kHz
2 kHz 2.5 kHz 3.15 kHz 4 kHz
5 kHz
6.3 kHz
8 kHz
10 kHz 12.5 kHz
A- Weighted
100
64.0
72.5
66.0
67.5
66.5
66.5
68.0
69.5
72.0
71.0
69.5
67.5
80.5
75
64.0
65.5
64.5
65.5
63.0
64.0
66.0
68.0
69.5
66.5
64.5
62.0
78.0
50
60.5
64.0
63.5
64.5
61.0
61.5
65.5
65.5
65.5
62.5
60.0
58.5
75.0
25
62.5
66.5
65.0
66.5
64.0
63.5
65.0
66.0
67.0
64.5
62.5
60.0
76.5
Catalog 602-2
17
Table 8, WMC 145D/150D, One-Third Octave Band Sound Ratings
Percent
Load
50 Hz
32.5
32.0
26.5
31.5
100
75
50
25
63 Hz
32.0
32.0
30.5
30.5
80 Hz
34.0
37.5
33.0
32.0
100 Hz
38.0
37.0
36.5
36.5
125 Hz
48.0
47.0
47.0
47.5
160 Hz
42.0
41.0
39.0
40.5
Octave Band
200 Hz
250 Hz
46.0
53.5
45.5
52.5
43.5
52.5
43.5
52.5
315 Hz
51.0
50.0
48.5
49.5
400 Hz
53.0
53.5
52.0
50.5
500 Hz
62.5
58.0
53.5
52.5
630 Hz
60.5
55.5
54.5
54.5
800 Hz
61.0
62.5
62.0
57.5
Table 8, continued
Percent
Load
100
75
50
25
1 kHz 1.25 kHz 1.6 kHz
70.5
65.0
68.0
67.5
61.5
59.5
57.5
62.5
57.0
63.5
58.0
56.5
2 kHz
62.0
58.5
55.5
56.0
2.5 kHz
63.0
60.5
55.5
54.0
Octave Band
3.15 kHz 4 kHz
62.5
61.0
59.0
60.0
54.5
55.5
53.5
54.0
5 kHz
61.5
58.0
50.0
49.5
6.3 kHz
60.0
55.0
48.0
48.0
8 kHz
59.0
54.0
45.5
45.0
10 kHz
59.0
56.5
51.0
47.5
12.5 kHz
58.0
57.5
50.5
48.0
A- Weighted
75.5
72.5
68.5
68.0
Table 9, WMC 250D/290D, One-Third Octave Band Sound Ratings
Percent
Load
100
75
50
25
50 Hz
32.0
32.0
33.0
33.0
63 Hz
32.5
32.5
33.0
33.0
80 Hz
33.0
32.5
32.0
31.5
100 Hz
38.0
37.5
37.0
35.5
125 Hz
49.0
48.0
48.5
48.0
Octave Band
200 Hz
250 Hz
50.5
56.0
48.5
54.0
47.5
53.0
45.5
56.0
315 Hz
56.0
61.5
58.5
56.0
Octave Band
3.15 kHz 4 kHz 5 kHz
69.5
71.5
73.0
67.5
69.5
70.5
65.0
68.5
66.5
63.5
66.0
64.5
6.3 kHz
71.0
66.5
62.0
59.5
160 Hz
47.5
46.0
43.5
42.0
400 Hz
70.0
60.5
52.5
49.5
500 Hz
65.5
58.0
57.5
58.5
630 Hz
65.0
64.0
64.0
61.0
800 Hz
71.0
63.0
57.5
59.0
Table 9, continued
Percent
Load
100
75
50
25
1 kHz
67.0
66.0
60.0
58.5
1.25 kHz
71.0
65.5
63.0
62.0
1.6 kHz
68.0
64.5
60.5
60.5
2 kHz
67.0
64.5
61.0
61.0
2.5 kHz
68.5
64.5
62.0
62.0
8 kHz
72.0
67.0
62.0
61.0
10 kHz
67.0
63.5
59.0
55.5
12.5 kHz A- Weighted
64.5
81.5
60.5
78.0
57.5
75.0
54.4
73.5
Table 10, WMC 400D, One-Third Octave Band Sound Ratings
Percent
Load
100
75
50
25
50 Hz
36.0
35.5
34.0
34.0
63 Hz
42.5
42.5
41.5
41.5
80 Hz
42.5
42.0
42.0
41.0
100 Hz
45.5
45.5
43.5
41.5
125 Hz
52.0
51.5
49.0
45.5
160 Hz
52.0
52.0
52.5
50.0
Octave Band
200 Hz 250 Hz
56.0
60.0
55.5
60.0
56.0
61.5
57.0
55.5
315 Hz
63.5
63.5
58.5
55.5
400 Hz
64.5
64.0
63.5
58.5
500 Hz
65.5
65.0
65.0
59.0
630 Hz
67.0
65.0
64.0
61.0
800 Hz
69.5
70.5
66.0
62.0
Table 11, continued
Percent Load
100
75
50
25
18
1 kHz 1.25 kHz 1.6 kHz 2 kHz
71.0
68.5
70.0
72.0
68.0
67.5
69.5
71.0
65.5
66.5
68.0
69.0
62.0
63.5
65.5
71.5
Octave Band
2.5 kHz 3.15 kHz 4 kHz 5 kHz
72.0
72.0
75.0 77.5
73.5
72.0
74.5 75.5
71.5
70.0
73.0 74.5
64.5
66.0
71.0 64.0
6.3 kHz
71.5
69.5
67.0
59.5
8 kHz
69.5
68.0
65.0
57.0
10 kHz 12.5 kHz
66.0
63.0
65.0
61.5
63.5
57.5
53.5
49.0
A-Weighted
83.5
82.5
81.0
77.0
Catalog 602-2
Dimensions
Figure 7, WMC 145S (B-vintage), 2-Pass, Right-hand (See page 26 for notes.)
22.6
574
SUCTION
RELIEF 3,4
VALVE
LB
4
WMC145SBS
26.9
684
CONDENSER
RELIEF
VALVES 3
22.5
571
EVAPORATOR
RELIEFVALVE
RB
57.5
1460
332834001
00 NONE
DRAWINGNUMBER
Z
REV.
SCALE
X
RF
5,13,14
LF
5,13
3,4
114.8
2916
81.0
2058
TOP
COMPR.
5,10,12
TOPVIEW
134.7 (UNITOVERALL)
3421 5,7,8
18.0
458
3
COMPRESSOR
17.1
435
O.I.T.S.
FRONT
END
BOX
74.3
1887
TOPFRONT
END BOX
UNIT
CTRL
BOX
58.3
1480
EVAPORATOR
RELIEFVALVE
44.3
5
1126
(OVERALL WIDTH)
37.8
960
5
32.7
831
5
69.8
1774
SUCTION
RELIEF
VALVE
4
IN
5
OUT
EVAPORATOR
3
65.9
1675
TOPUNIT
CTRL BOX
5
29.3
744
CONDENSER
RELIEF
VALVES
3
44.8
1137
OUT
IN
CONDENSER
Y
Y
X
6.2
157
14.7
375
101.6
2579
112.1
2846
CL
5.6
142
INLET
10.0
254
11.1
283
26.5
673
5,7,8
5.6
142
OUTLET
IN
RIGHTVIEW
6.0
152
NOM.
TYP.(2X)
13.0
330
INLET/
OUTLET
CL
CL
8.0
203
NOM.
TYP.(2X)
19.0
483
OUTLET
7,8
CONDENSERHEAD 2-PASS
VICTAULIC150 PSI WATERSIDE
114.8
2916
1.13
29
MTG. HOLE
(TYP.)
8.0
203
ELECTRICAL
CONNECTIONS
8.0
203
RB
MOUNTING
FOOT (TYP.)
9.0
230
UNITCTRL BOX
OUT
IN
5.6
143
INLET
7,8
LF
5.6
143
OUTLET
CL
OUT
EVAPORATORHEAD 2-PASS
VICTAULIC150 PSI WATERSIDE
LB
4.0
102
34.5
876
128.3
3259
FRONTVIEW
13.0
330
INLET
Z
5.3
133
TYP. BOTH
ENDS
3
16.8
425
FRONTEND BOX
14.0
357
34.5
876
11.3
287
6.3
160
8.9
225
5,13,14
16.0
407
31.9
809
RF
5,13
34.0
864
13.8
352
ALL DIMENSIONSAREIN DECMAL
INCHESAND [MILLIMATERS]
SEEDRAWING332835001 FORNOTES
Catalog 602-2
19
Figure 8, WMC 145D (B-vintage), 2-Pass, Right-hand (See page 26 for notes)
26.3
667
CONDENSER
RELIEF
3
VALVES
15.4
391
4
46.0
1168
4
LB
RB
WMC145DBS
332834101
25.3
643
EVAPORATOR
RELIEF 3,4
VALVE
SCALE
Z
X
LF
RF
22.6
574
SUCTION
RELIEF 3,4
VALVE
5,13,14
44.3
1126
(OVERALL WIDTH)
5
5,13
114.8
2916
TOPVIEW
7.6
194
#1
134.7 (UNITOVERALL)
3421 5,7,8
#2
17.1
435
FRONT
END
BOX
UNIT
CTRL
BOX
58.6
1487
EVAPORATOR
RELIEF
VALVES
3
9.5
241
5,7,8
13.0
330
INLET
5.3
133
TYPICAL
BOTH ENDS
6.2
157
3
101.6
2579
5.6
142
10.0
254
RIGHTVIEW
13.0
330
INLET/
OUTLET
5.6
142
6.0
152
NOM.
TYP.(2X)
IN
5.6
143
OUTLET
OUT
IN
5.6
143
INLET
7,8
7,8
CONDENSERHEAD 2-PASS
VICTAULIC150PSI WATERSIDE
114.8
2916
1.13
29
MTG. HOLE
(TYP.)
8.0
203
8.0
203
MOUNTING
FOOT(TYP.)
LB
ELECTRICAL
CONNECTIONS
UNITCTRL BOX
RB
14.0
357
11.3
287
FRONTEND BOX
9.0
230
16.0
407
38.6
981
34.5
876
RF
13.8
352
5,13,14
9.1
232
4.0
102
26.5
673
34.5
876
EVAPORATORHEAD 2-PASS
VICTAULIC150PSI WATERSIDE
6.3
160
16.8
425
Z
11.1
283
OUT
LF
OUT
IN
FRONTVIEW
8.0
203
NOM.
TYP.(2X)
19.0
483
OUTLET
44.8
1137
112.1
2846
128.3
3259
69.8
1774
SUCTION
RELIEF
VALVES
4
OUT
Y
X
5
IN
66.1
1678
TOPUNIT
CTRL BOX
5
CONDENSER
Y
5
32.7
831
74.3
1887
TOPFRONT
END BOX
5
EVAPORATOR
29.2
742
CONDENSER
RELIEF
VALVES
3
37.8
960
81.1
2060
TOP
COMPR.
5,10,12
3
20
00 NONE
DRAWINGNUMBER REV.
5,13
34.0
864
TOPVIEW
ALL DIMENSIONSAREIN DECIMAL
INCHESAND [MILLIMETERS]
SEEDRAWING332835001 FORNOTES
Catalog 602-2
Figure 9, WMC 150D (B-vintage), 2-Pass, Right-hand (See page 26 for notes)
22.6
3,4
574
SUCTION PIPE
RELIEFVALVES
46.6
1184
LB
46.0
1168
4
RB
4
WMC150DBS
332834201
26.3
667
CONDENSER
RELIEFVALVES
3
00
Z
21.8
3,4
554
EVAPORATOR
RELIEFVALVES
NONE
REV.
DRAWINGNUMBER
SCALE
X
5,13,14
LF
RF
5,13
146.9
3732
44.3
5
1126
(OVERALL WIDTH)
TOPVIEW
15.5
393
3
17.1
435
#2
#1
FRONT
END
BOX
37.8
960
81.1
2060
TOP
COMPR.
5,10,12
169.6 (UNITOVERALL)
5,7,8
4307
5
32.8
833
5
O.I.T.S.
69.8
1774
SUCTION
RELIEF
VALVES
4
UNIT
CTRL
BOX
IN
58.2
1479
EVAPORATOR
RELIEF
3
VALVES
74.3
1887
TOPFRONT
END BOX
5
EVAPORATOR
29.2
742
CONDENSER
RELIEF
VALVES
3
X
15.9
405
6.2
157
3
5.3
133
TYP. BOTH
ENDS
44.8
1137
66.0
1677
TOPUNIT
CTRL BOX
5
CONDENSER
Y
OUT
OUT
IN
Y
10.0
254
11.1
283
136.4
3466
5,7,8
13.3
337
INLET
34.5
876
FRONTVIEW
5.6
142
INLET
4.0
102
26.5
673
146.9
3732
163.2
4145
16.8
425
Z
RIGHTVIEW
5.6
142
OUTLET
13.3
337
INLET/
OUTLET
5.6
143
OUTLET
6.0
152
NOM.
TYP.(2X)
IN
OUT
19.3
489
OUTLET
OUT
8.0
203
NOM.
TYP.(2X)
IN
5.6
143
INLET
7,8
7,8
EVAPORATORHEAD 2-PASS
VICTAULIC150PSI WATERSIDE
CONDENSERHEAD 2-PASS
VICTAULIC150PSI WATERSIDE
149.7
3802
1.13
29
MTG. HOLES
(TYP.)
MOUNTING
FOOT(TYP.)
LB
ELECTRICAL
CONNECTION
9.0
230
FRONT END BOX
13.8
352
5,13
11.4
289
UNIT CTRL BOX
6.3
160
RF
5,13,14
14.0
357
34.0
864
82.6
2098
Catalog 602-2
RB
34.5
876
LF
11.3
287
8.0
203
8.0
203
TOPVIEW
16.0
407
ALL DIMENSIONSAREIN DECIMAL
INCHESAND [MILLIMETERS]
SEEDRAWING332835001 FORNOTES
21
Figure 10, WMC 250D (B-vintage), 2-Pass, Right-hand (See page 26 for notes)
28.9
735
EVAPORATOR
RELIEFVALVES
3,4
27.9
708
CONDENSER
RELIEFVALVES
3
24.2
615
SUCTION
RELIEF
3,4 VALVES
46.0
1168
15.9
403
RB
4
4
LB
WMC250DBS
332834301
00
NONE
REV.
DRAWINGNUMBER
SCALE
Z
X
LF
5,13
RF
5,13,14
114.8
2916
48.0
5
1220
(OVERALL WIDTH)
TOPVIEW
135.7 (OVERALL UNIT)
3447
5,7,8
8.1
206
#1
84.0
2134
TOPOF
COMPR.
5,10,12
11.1
283
#2
41.5
1054
5
36.4
925
5
O.I.T.S.
FRONT
END
BOX
UNIT
CTRL
BOX
61.2
1555
EVAPORATOR
RELIEF
VALVE
74.0
1881
TOP
FRONT
END BOX
5
EVAPORATOR
72.8
1850
SUCTION
RELIEF
VALVES
4
IN
OUT
45.8
1162
3
29.2
742
CONDENSER
RELIEF
VALVES
3
65.7
1669
TOPUNIT
CTRL BOX
5
CONDENSER
Y
OUT
IN
Y
X
6.2
157
3
9.5
241
101.6
2579
112.1
2846
7.1
180
INLET
12.0
305
30.1
765
17.1
435
RIGHT VIEW
5,7,8
7.1
180
OUTLET
4.0
102
38.1
968
134.7
3421
FRONTVIEW
13.3
337
INLET
11.1
283
5.3
133
TYP. BOTH
ENDS
15.8
400
Z
8.6
219
NOM.
TYP.(2X)
19.3
489
INLET/
OUTLET
5.6
142
OUTLET
IN
OUT
13.3
337
OUTLET
OUT
8.6
219
NOM.
TYP.(2X)
IN
CONDENSERHEAD 2-PASS
VICTAULIC150PSI WATERSIDE
EVAPORATORHEAD 2-PASS
VICTAULIC150PSI WATERSIDE
114.8
2916
1.13
29
MTG. HOLE
TYP.
8.0
203
5.6
142
INLET
8.0
203
MOUNTINGFEET
LB
RB
9.0
230
RF
UNITCTRL BOX
9.1
232
ELECTRICAL
CONNECTION
38.1
968
LF
FRONTEND BOX
14.0
357
5,13
16.0
407
5,13,14
34.0
864
38.9
987
TOPVIEW
22
11.4
289
13.9
353
SEEDRAWING332835001 FORNOTES
ALL DIMENSIONSAREIN DECIMAL
INCHESAND [MILLIMETERS]
Catalog 602-2
Figure 11, WMC 290D (B-vintage), 2-Pass, Right-hand (See page 26 for notes.)
27.9
708
EVAPORATOR
3,4 RELIEF
VALVE
RB
49.1
1247
46.0
1168
4
LB
4
WMC290DBS
332834401
23.4
595
CONDENSER
RELIEF 3
VALVES
00
NONE
REV.
DRAWINGNUMBER
SCALE
Z
X
5,13
RF
24.2
615
SUCTION
RELIEF 3,4
VALVE
LF
5,13,14
149.7
3802
TOPVIEW
170.6 (UNITOVERALL)
4333
5,7,8
15.5
393
3
48.0
5
1220
(OVERALL WIDTH)
11.1
283
#2
#1
41.5
1054
84.0
2134
TOPOF
COMPR.
5,10,12
5
36.5
927
5
O.I.T.S.
FRONT
END
BOX
74.1
1881
TOP
FRONT
END BOX
5
UNIT
CTRL
BOX
61.2
1554
EVAPORATOR
RELIEF
VALVES
3
IN
OUT
EVAPORATOR
29.2
742
CONDENSER
RELIEF
VALVES
3
X
5.9
151
5.3
133
TYPICAL
BOTH ENDS
6.2
157
3
13.3
337
INLET
7.1
180
INLET
15.8
400
Z
12.0
305
30.1
765
4.0
102
38.1
968
163.6
4155
FRONTVIEW
OUT
IN
Y
17.1
435
136.4
3466
146.9
3732
45.8
1162
65.9
1673
TOPUNIT
CTRL BOX
5
CONDENSER
Y
72.8
1850
SUCTION
RELIEF
VALVES
4
RIGHT VIEW
5,7,8
7.1
180
OUTLET
8.0
203
NOM.
TYP.(2X)
19.3
489
INLET/
OUTLET
5.6
142
OUTLET
IN
OUT
IN
8.0
203
NOM.
TYP.(2X)
13.3
337
OUTLET
OUT
CONDENSERHEAD 2-PASS
VICTAULIC150PSI WATERSIDE
EVAPORATORHEAD 2-PASS
VICTAULIC150PSI WATERSIDE
149.7
3802
1.13
29
MTG. HOLE
TYP.
5.6
142
INLET
8.0
203
8.0
203
MOUNTINGFEET
RB
LB
ELECTRICAL
CONNECTION
RF
11.4
289
9.0
230
FRONT END BOX
13.9
353
11.4
289
Catalog 602-2
LF
UNIT CTRL BOX
5,13,14
5,13
34.0
864
16.0
407
14.0
357
82.6
2098
TOPVIEW
38.1
968
6.4
162
SEEDRAWING332835001 FORNOTES
ALL DIMENSIONSAREIN DECIMAL
INCHESAND [MILLIMETERS]
23
Figure 12, WMC 400D (B-vintage), 2-Pass, Right-hand (See page 26 for notes.)
33.4
847
CONDENSER
3 RELIEF
VALVES
LB
46.0
1168
4
RB
4
WMC400DBS
29.0
737
SUCTION
RELIEF
VALVES
3,4
28.9
734
EVAPORATOR
RELIEF 3,4
VALVES
47.1
1197
332834501
5,13
149.7
3802
15.5
393
3
TOPVIEW
#1
UNIT
CTRL
BOX
81.6
2074
TOP
FRONT
END
BOX
5
EVAPORATOR
3
OUT
54.5
1385
OUT
IN
13.1
332
36.0
914
146.9
3732
8.1
207
INLET
10.0
255
NOM.
TYP(2X)
RIGHTVIEW
13.0
330
INLET/
OUTLET
8.1
207
OUTLET
8.0
203
NOM.
TYP.(2X)
IN
7,8
7,8
EVAPORATORHEAD 2-PASS
VICTAULIC150 PSI WATERSIDE
CONDENSERHEAD 2-PASS
VICTAULIC150 PSI WATERSIDE
149.7
3802
1.13
29
MTG. HOLE
(TYP.)
8.0
203
MOUNTING
FOOT (TYP.)
LB
ELECTRICAL
CONNECTIONS
FRONTEND BOX
82.6
2098
8.0
203
RB
RF
UNITCTRL BOX
14.0
357
7.1
180
INLET
44.0
1118
9.0
230
5,13,14
5,13
34.0
864
OUT
CL
OUT
11.4
289
7.1
180
OUTLET
CL
IN
CL
LF
4.0
102
44.0
1118
164.4
4174
5,7,8
CL
19.5
495
Z
11.1
283
136.4
3466
FRONTVIEW
83.4
2117
RELIEF
VALVES
3
Y
5.3
133
TYPICAL
BOTH ENDS
6.2
157
8.2
208
5
IN
73.4
1864
TOP
UNIT
CTRL
BOX
5
CONDENSER
X
16.0
406
INLET/
OUTLET
5
39.2
996
O.I.T.S.
72.0
1829
EVAPORATOR
RELIEF
VALVE 3
5.9
151
44.2
1123
94.5
2401
TOPOF
COMPR.
5,10,12
14.1
359
#2
FRONT
END
BOX
16.0
407
TOPVIEW
24
NONE
50.8
5
1289
(OVERALL WIDTH)
LF
10.8
273
.
RF
5,13,14
Y
REV
X
168.7 (UNIT OVERALL)
4285
5,7,8
35.0
888
CONDENSER
RELIEF
VALVES
3
00 SCALE
DRAWINGNUMBER
Z
3.2
81
ALL DIMENSIONSAREIN DECIMAL
INCHESAND[ MILLIMETERS]
SEEDRAWING332835001 FORNOTES
Catalog 602-2
Marine Water Box Dimensions with Victaulic or Flanged Connections
Marine water boxes are an available option on all evaporator and condenser sizes. Caution: There is some
nomenclature confusion in the industry. We refer to our standard dished heads as “dished heads”. Some
manufacturers refer to them, or similar devices as “water boxes”. They are not “marine water boxes” with
removable end covers as illustrated below.
REAR FACING ONLY
REAR FACING ONLY
REAR FACING ONLY
150 PSI Non-ASME - Victaulic Connection
Evap.
Dia.
1 PASS
2 PASS
3 PASS
'AAA' 'BBB' 'CCC 'DDD' 'EEE' 'AAA' 'BBB' 'CCC' 'DDD' 'EEE' 'FFF' 'GGG' 'AAA' 'BBB' 'CCC' 'DDD' 'EEE' 'FFF'
E22 10.75 17.00 21.25 20.00 10.00 8.625 17.00 21.00 20.00 10.00 5.59
23.00 5.563 17.00 21.25 20.00 10.00
7.12
E26 10.75 19.00 21.25 20.00 10.00 8.625 19.00 21.25 20.00 10.00 7.07
19.00 6.625 19.00 21.25 20.00 10.00
8.07
E30 14.00 21.00 28.50 26.50 13.25 10.75 21.00 28.50 26.50 13.25 8.13
21.00 6.625 21.00 28.50 26.50 13.25 10.19
Cond.
Dia.
1 PASS
2 PASS
3 PASS
'AAA' 'BBB' 'CCC 'DDD' 'EEE' 'AAA' 'BBB 'CCC' 'DDD' 'EEE' 'FFF' 'GGG' 'AAA' 'BBB' 'CCC' 'DDD' 'EEE' 'FFF'
C20
8.62 16.00 19.00 18.00 9.00 6.625 16.00 19.00 18.00 9.00
5.63 16.00
C22
10.75 17.00 21.25 20.00 10.00 8.625 17.00 21.00 20.00 10.00 5.59 23.00
C26
10.75 19.00 21.25 20.00 10.00 8.625 19.00 21.25 20.00 10.00 7.07 19.00
Consult Daikin McQuay Sales Office
Notes:
1. Dimensions in inches.
2. Flanges are ANSI raised face. Mating flanges by others.
3. Some condensers with flanges can have staggered connections due to flange interference. Consult factory.
4. Flanges add 0.5 inches to the distance from the vertical centerline to the flange face compared to Victaulic.
Catalog 602-2
25
Drawing Notes
NOTES:
1. All dimensions are in inches and [millimeters] unless noted otherwise.
2. Final connections must allow for .500 inch +/- [12.7mm] manufacturing tolerances.
3. 1.00-inch FPT [25.4 mm] evaporator and condenser relief valves must be piped per ANSI / ASHRAE
15. Number of relief valves is 1 per evaporator and 2 per condenser.
4. .375 inch [9 mm] suction nozzle relief valve must be piped per ANSI / ASHRAE 15.
5. Clearances:
108 inches (2743 mm) on WMC 145S/D and WMC 250D at one end
Ends
144 inches (3658 mm) on WMC 150D, WMC 290, and WMC 400D at one end
plus 36 inches (910 mm) is required at the opposite end. If tube pull and cleaning
clearance is at the connection end, do not block tube access with piping, pumps, etc.
36 inches (914 mm) is recommended on all other sides and top for service clearance
Sides
except unit front electric panels. See below..
Electric Panels Most codes require 48 inches (1219 mm) clearance in front of the control boxes and
electrical panels.
6. 3.25-inch [83mm] diameter lifting holes are provided at the upper corners of each vessel. See
installation manual for lifting instructions.
7. All water connections are given in standard U.S. pipe sizes. Standard Victaulic® connections are also
suitable for welding.
8. The water connection shown is for the default configuration; your unit may be configured differently.
Orientation (left/right) is determined while facing the control panel. Consult the Item Summary sheet
for exact configuration. Unit shown has standard right-hand water connections. Left-hand connections
are available for either vessel. For left hand evaporator the inlet and outlet nozzles are reversed. ANSIflanged connections are available upon request. When using ANSI-flanged connections add .500 inch
[13 mm] to each flanged end.
9. Dimensions shown are for units (evaporator / condenser) with standard design pressures. The
refrigerant side design pressure is 200 PSI {1380 kPa} and the waterside design pressure is 150 PSI
{1034 kPa}. Consult the factory for unit dimensions with higher design pressures.
10. The unit vibration isolator pads are provided for field installation. When fully loaded are 0.250 inches
[6 mm] thick.
11. These values are for units with standard wall thickness copper tubing only.
12. The shipping skid adds 6.0 inches [152 mm] to the overall unit height.
13. All-power wiring is brought into the top of the compressor power panel (Front End Box). Field control
wiring is brought into the Unit Control Box.
14. The unit is shipped with an operating charge of refrigerant.
15. Optional marine water box connections are available upon request.
26
Catalog 602-2
Physical Data and Weights
Lifting and Mounting Weights
"LL"
"LW"
OH
RB
LB
Z
MFW
RF
X
LF
MFL
OL
OW
332834901
DRAWINGNUMBER
Catalog 602-2
00
REV.
NONE
SCALE
27
Physical Data
Evaporator
Refrigerant-side design pressure is 200 psi
(1379 kPa). Water-side is 150 psi (1034 kPa).
Approximate total square footage of insulation
surface required for individual packaged chillers is
tabulated by evaporator code and can be found
below. The suction elbow and compressor also
require insulation.
Table 12, Evaporator Physical Data
WMC
Model
Evaporator
Model
Tube
Length
Unit Refrigerant
Charge
lb. (kg)
550 (250)
800 (363)
600 (272)
1100 (500)
1240 (562)
Evaporator
Water
Volume, gal (L)
38 (145)
45 (170)
61 (231)
72 (273)
88 (336)
Insulation
Area
2
sq. ft. (m )
66 (6.1)
90 (8.3)
76 (7.1)
102 (9.4)
114 (11)
Number of
Relief
Valves
1
1
1
1
1
E2209
9 ft.
145S 145D
E2212
12 ft.
150D
E2609
9 ft.
250D
E2612
12 ft.
290D
E3012
12 ft.
400D
Notes:
1. Refrigerant charge is approximate since the actual charge will depend on other variables. Actual charge will be shown on the
unit nameplate and is tabulated above.
2. Water capacity is based on standard tube configuration and standard dished heads.
Condenser
With positive pressure systems, the pressure
variance with temperature is always predictable
and the vessel design and pressure relief
protection are based upon pure refrigerant
characteristics. R-134a requires ASME vessel
design, inspection and testing and uses springloaded pressure relief valves. When an over-
pressure condition occurs, spring-loaded relief
valves purge only that quantity of refrigerant
required to reduce system pressure to the valve’s
set pressure, and then close.
Refrigerant-side design pressure is 200 psi (1380
kPa). Water-side design is 150 psi (1034 kPa).
Table 13, Condenser Physical Data
WMC
Model
Condenser
Model
Tube
Length
Maximum
Pumpdown
Capacity lb. (kg)
728 (330)
971 (440)
883 (401)
1174 (533)
1676 (760)
Water
Volume
gal. (L)
47 (147)
62 (236)
50 (223)
72 (273)
111 (419)
Number of
Relief Valves
C2009
9 ft.
2
145S, 145D
C2012
12 ft.
2
150D
C2209
9 ft.
2
250D
C2212
12 ft.
2
290D
C2612
12 ft.
2
400D
Notes:
1. Condenser pumpdown capacity based on 90% full at 90F.
2. Water capacity based on standard configuration and standard heads and can be less with lower tube counts.
3. See Relief Valves section for additional information.
28
Catalog 602-2
Relief Valves
As a safety precaution and to meet code requirements, each
chiller is equipped with pressure relief valves located on the
condenser and evaporator for the purpose of relieving excessive
refrigerant pressure (caused by equipment malfunction, fire,
etc.) to the atmosphere. Most codes require that relief valves be
vented to the outside of a building and this is a desirable
practice for all installations. Relief piping connections to the
relief valves must have flexible connectors.
Note: Remove plastic shipping plugs (if installed) from the
inside of the valves prior to making pipe connections.
Whenever vent piping is installed, the lines must be run in
accordance with local code requirements; where local codes do
not apply, the latest issue of ANSI/ASHRAE Standard 15 code
recommendations must be followed.

Condensers have two relief valves as a set with a three-way
valve separating the two valves. One valve remains active at
all times and the second valve acts as a standby.

Evaporators have a single valve. Each valve has a 1.0-inch
female NPT connection.

Each suction line on dual compressor units has a single 200 psig relief valve rated at 6.9 lb/min air with a
3/8-inch flare connection.
Vessel valve capacity is 75.5 lb/min air.
Figure 13, Typical Vent Piping
Catalog 602-2
29
Electrical Data
General Note: The RLA for use in the following tables is obtained by the selection of a specific unit by Daikin
McQuay. When shipped, a unit will bear the specific RLA, stamped on the nameplate, for the selected operating
conditions.
!
CAUTION
The RLA stamped on the unit may be lower than the minimum shown in the following tables, in which case the
minimum table value must be used for wire sizing.
Table 14, Electrical Acronyms and Notes
ACRONYMS:
DS
LRA
N/A
MCA
MOP
PB
Disconnect switch
Locked rotor amps
Not available
Minimum circuit ampacity
Maximum overcurrent protection
Power block
RLA
Rated load amps
NOTES:
1
2
3
In all cases, a disconnect switch is supplied for each compressor circuit.
RLA and LRA data is for each compressor
Wire size per NEC 2008, table 310.16, 75° C, copper
4
MOP size per NEC 2008, section 440.22(a) for air conditioning and refrigeration equip.
WMC 145S, Single Compressor
Table 15, WMC 145S-B, 3/60/460
SINGLE POINT CONNECTION, STANDARD
COMPRESSOR
RLA
[Amp]
LRA
[Amp]
QTY
MCA
[Amp]
MOP
[Amp]
79 to 80
81 to 88
89 to 92
93 to 99
110
110
110
110
1
1
1
1
99 to 100
101 to 110
111 to 115
116 to 123
175
175
200
200
100
110
1
125
101 to 104
105 to 111
132
132
1
1
112 to 120
132
121 to 133
154
134 to 140
141 to 150
30
CHILLER
DISC.
POWER
SWT.
BLOCK
[Amp]
[Amp]
WIRE
QTY
WIRE
GAUGE
150
150
150
150
3
3
3
3
3 GA
2 GA
2 GA
1 GA
225
150
3
1 GA
126 to 130
131 to 138
225
225
200
200
3
3
1 GA
1/0
1
140 to 150
250
200
3
1/0
1
151 to 166
250
225
3
2/0
154
1
167 to 175
300
225
3
2/0
165
1
176 to 187
300
225
3
3/0
N/A
Catalog 602-2
Table 16, WMC 145S-B, 3/50/400
SINGLE POINT CONNECTION, STANDARD
COMPRESSOR
CHILLER
DISC.
POWER
SWT.
BLOCK
[Amp]
[Amp]
RLA
[Amp]
LRA
[Amp]
QTY
MCA
[Amp]
MOP
[Amp]
100 to 104
105 to 111
112 to 120
121 to 133
132
132
132
165
1
1
1
1
125 to 130
132 to 139
140 to 150
152 to 167
225 Amps
225 Amps
250 Amps
250 Amps
200
200
200
225
134 to 140
165
1
168 to 175
300 Amps
225
141 to 150
151 to 155
165
176
1
1
177 to 188
189 to 194
300 Amps
300 Amps
156 to 160
176
1
195 to 200
350 Amps
WIRE
QTY
WIRE
GAUGE
3
3
3
3
3 GA
2 GA
2 GA
1 GA
3
1 GA
225
250
3
3
1 GA
1/0
250
3
1/0
N/A
WMC 145D & 150D, Dual Compressor
Table 17, WMC 145D-B & WMC 150D-B, 3/60/460
SINGLE POINT CONNECTION, STANDARD
COMPRESSOR (EACH)
CHILLER
DISC.
POWER
SWT.
BLOCK
[Amp]
[Amp]
RLA
[Amp]
LRA
[Amp]
QTY
MCA
[Amp]
MOP
[Amp]
52 to 53
54 to 57
58 to 61
71
71
71
2
2
2
117 to 120
122 to 129
131 to 138
150
175
175
250
250
250
62 to 64
71
2
140 to 144
200
65 to 69
70 to 76
77
88
88
88
2
2
2
147 to 156
158 to 171
173
78 to 80
88
2
81 to 88
89 to 92
110
110
2
2
WIRE
QTY
WIRE
GAUGE
760
760
760
3
3
3
1 GA
1 GA
1/0
250
760
3
1/0
200
225
250
250
250
250
760
760
760
3
3
3
2/0
2/0
2/0
176 to 180
250
250
760
3
3/0
182 to 198
200 to 207
250
250
250
250
760
760
3
3
3/0
4/0
93 to 100
110
2
209 to 225
300
250
760
3
4/0
101 to 102
103 to 107
108 to 113
132
132
132
2
2
2
227 to 230
232 to 241
243 to 254
300
300
350
400
400
400
760
760
760
3
3
3
4/0
250MCM
250MCM
114 to 120
132
2
257 to 270
350
400
760
3
300MCM
Continued next page.
Catalog 602-2
31
Table 17, WMC 145D-B & WMC 150D-B, 3/60/460 (Continued)
MULTI-POINT CONNECTION, OPTIONAL
COMPRESSOR (EACH)
CHILLER (PER CIRCUIT)
DISC.
POWER
MOP
SWT.
BLOCK
[Amp]
[Amp]
[Amp]
RLA
[Amp]
LRA
[Amp]
QTY
MCA
[Amp]
52
53 to 55
71
71
2
2
65
66 to 69 A
110
110
100
100
56 to 64
71
2
70 to 80 A
125
65 to 68
69 to 77
88
88
2
2
82 to 85 A
86 to 97 A
150
150
78 to 80
88
2
98 to 100
81 to 88
89 to 92
93 to 99
110
110
110
2
2
2
WIRE
QTY
WIRE
GAUGE
N/A
N/A
3
3
6 GA
4 GA
100
N/A
3
4 GA
125
125
N/A
N/A
3
3
4 GA
3 GA
175
125
N/A
3
3 GA
101 to 110
111 to 115
116 to 124
175
200
200
150
150
150
N/A
N/A
N/A
3
3
3
2 GA
2 GA
1 GA
100
110
2
125
225
150
N/A
3
1 GA
101 to 104
105 to 111
132
132
2
2
126 to 130
131 to 139
225
225
200
200
N/A
N/A
3
3
1 GA
1/0
112 to 120
132
2
140 to 150
250
200
N/A
3
1/0
Table 18, WMC 145D-B & WMC 150D-B, 3/60/575
SINGLE POINT CONNECTION, STANDARD
COMPRESSOR (EACH)
CHILLER
DISC.
POWER
SWT.
BLOCK
[Amp]
[Amp]
RLA
[Amp]
LRA
[Amp]
QTY
MCA
[Amp]
MOP
[Amp]
51
52 to 53
54 to 57
58 to 61
71
71
71
71
2
2
2
2
115
117 to 120
122 to 128
131 to 138
150
150
175
175
250
250
250
250
62 to 64
71
2
140 to 144
200
65 to 69
70 to 76
77
88
88
88
2
2
2
147 to 155
158 to 171
173
78 to 80
88
2
81 to 88
89 to 92
110
110
93 to 100
110
WIRE
QTY
WIRE
GAUGE
760
760
760
760
3
3
3
3
2 GA
1 GA
1 GA
1/0
250
760
3
1/0
200
225
250
250
250
250
760
760
760
`
3
3
2/0
2/0
2/0
176 to 180
250
250
760
3
3/0
2
2
182 to 198
200 to 207
250
250
250
250
760
760
3
3
3/0
4/0
2
209 to 225
300
250
760
3
4/0
WIRE
QTY
WIRE
GAUGE
MULTI-POINT CONNECTION, OPTIONAL
COMPRESSOR (EACH)
32
CHILLER (PER CIRCUIT)
DISC.
POWER
MOP
SWT.
BLOCK
[Amp]
[Amp]
[Amp]
RLA
[Amp]
LRA
[Amp]
QTY
MCA
[Amp]
51 to 52
53 to 55
71
71
2
2
64 to 65 A
66 to 69
110
110
100
100
N/A
N/A
3
3
6 GA
4 GA
56 to 64
71
2
70 to 80 A
125
100
N/A
3
4 GA
65 to 68
69 to 77
88
88
2
2
82 to 85 A
86 to 97 A
150
150
125
125
N/A
N/A
3
3
4 GA
3 GA
78 to 80
88
2
98 to 100
175
125
N/A
3
3 GA
81 to 88
89 to 92
93 to 99
100
110
110
110
110
2
2
2
2
101 to 110
111 to 115
116 to 124
125
175
200
200
225
150
150
150
150
N/A
N/A
N/A
N/A
3
3
3
3
2 GA
2 GA
1 GA
1 GA
Catalog 602-2
Table 19, WMC 145D-B & WMC 150D-B, 3/50/400
SINGLE POINT CONNECTION, STANDARD
COMPRESSOR (EACH)
CHILLER
DISC.
POWER
SWT.
BLOCK
[Amp]
[Amp]
RLA
[Amp]
LRA
[Amp]
QTY
MCA
[Amp]
MOP
[Amp]
63 to 69
88
2
142 to 156
200
250
70 to 76
77
88
88
2
2
158 to 171
174
225
250
78 to 80
88
2
176 to 180
81 to 88
89 to 92
110
110
2
2
183 to 198
201 to 207
93 to 100
110
2
101 to 102
103 to 107
108 to 113
132
132
132
114 to 120
132
WIRE
QTY
WIRE
GAUGE
760
3
2/0
250
250
760
760
3
3
2/0
2/0
250
250
760
3
3/0
250
250
250
250
760
760
3
3
3/0
4/0
210 to 225
300
250
760
3
4/0
2
2
2
228 to 230
232 to 241
243 to 255
300
300
350
400
400
400
760
760
760
3
3
3
4/0
250MCM
250MCM
2
257 to 270
350
400
760
3
300MCM
MULTI-POINT CONNECTION, OPTIONAL
COMPRESSOR (EACH)
CHILLER (PER CIRCUIT)
DISC.
POWER
MOP
SWT.
BLOCK
[Amp]
[Amp]
[Amp]
150
250
760
150
250
760
RLA
[Amp]
LRA
[Amp]
QTY
MCA
[Amp]
63 to 68
69 to 77
88
88
2
2
79 to 85
87 to 97
78 to 80
88
2
98 to 100
175
250
81 to 88
110
2
102 to 110
175
89 to 92
110
2
112 to 115
200
93 to 99
110
2
117 to 124
200
250
760
3
1 GA
100
110
2
125
225
250
760
3
1 GA
101 to 104
105 to 111
132
132
2
2
127 to 130
132 to 139
225
225
400
400
760
760
3
3
1 GA
1/0
112 to 120
132
2
140 to 150
250
400
760
3
1/0
Catalog 602-2
WIRE
QTY
WIRE
GAUGE
3
3
4 GA
3 GA
760
3
3 GA
250
760
3
2 GA
250
760
3
2 GA
33
WMC 250D & 290D, Dual Compressor
Table 20, WMC 250D-B & WMC 290D-B, 3/60/460
SINGLE POINT CONNECTION, STANDARD
COMPRESSOR (Each)
RLA
[Amp]
LRA
[Amp]
QTY
MCA
[Amp]
MOP
[Amp]
79 to 88
89 to 92
110
110
2
2
178 to 198
201 to 208
250
250
CHILLER
DISC.
POWER
SWT.
BLOCK
[Amp]
[Amp]
250
250
760
760
WIRE
QTY
WIRE
GAUGE
3
3
3/0
4/0
93 to 100
110
2
210 to 226
300
250
760
3
4/0
101 to 107
108 to 113
132
132
2
2
228 to 241
244 to 255
300
350
400
400
760
760
3
3
250 MCM
250 MCM
114 to 120
132
2
257 to 271
350
400
760
3
300 MCM
121 to 123
124 to 126
127 to 137
138
154
154
154
154
2
2
2
2
273 to 277
280 to 284
286 to 309
311
350
400
400
400
400
400
400
400
760
760
760
760
3
3
3
3
300 MCM
300 MCM
350 MCM
400 MCM
139 to 140
154
2
313 to 316
450
400
760
3
400 MCM
141 to 149
165
2
318 to 335
450
400
760
3
400 MCM
150
165
2
338 Amps
450
400
760
3
500 MCM
WIRE
QTY
WIRE
GAUGE
MULTI POINT CONNECTION, OPTIONAL
COMPRESSOR (EACH)
34
CHILLER (PER CIRCUIT)
DISC.
POWER
MOP
SWT.
BLOCK
[Amp]
[Amp]
[Amp]
RLA
[Amp]
LRA
[Amp]
QTY
MCA [Amp]
79 to 80
81 to 88
89 to 92
93 to 99
110
110
110
110
2
2
2
2
99 to 100
101 to 110
111 to 115
116 to 123
175
175
200
200
150
150
150
150
N/A
N/A
N/A
N/A
3
3
3
3
3 GA
2 GA
2 GA
1 GA
100
110
2
125
225
150
N/A
3
1 GA
101 to 104
105 to 111
132
132
2
2
126 to 130
131 to 138
225
225
200
200
N/A
N/A
3
3
1 GA
1/0
112 to 120
132
2
140 to 150
250
200
N/A
3
1/0
121 to 133
154
2
151 to 166
250
225
N/A
3
2/0
134 to 140
154
2
167 to 175
300
225
N/A
3
2/0
141 to 150
165
2
176 to 187
300
225
N/A
3
3/0
Catalog 602-2
Table 21, WMC 250D-B & WMC 290D-B, 3/50/400
SINGLE POINT CONNECTION, STANDARD
COMPRESSOR (EACH)
CHILLER
DISC.
POWER
SWT.
BLOCK
[Amp]
[Amp]
RLA
[Amp]
LRA
[Amp]
QTY
MCA [Amp]
MOP
[Amp]
100 to 107
108 to 113
132
132
2
2
225 to 241
243 to 255
300
350
400
400
114 to 120
132
2
257 to 270
350
121 to 123
124 to 126
165
165
2
2
273 to 277
279 to 284
127 to 137
165
2
138
139 to 148
149 to 150
151 to 153
165
165
165
176
154 to 160
176
WIRE
QTY
WIRE
GAUGE
760
760
3
3
250 MCM
250 MCM
400
760
3
300 MCM
350
400
400
400
760
760
3
3
300 MCM
300 MCM
286 to 309
400
400
760
3
350 MCM
2
2
2
2
311
313 to 333
336 to 338
340 to 345
400
450
450
450
400
400
400
400
760
760
760
760
3
3
3
3
400 MCM
400 MCM
500 MCM
500 MCM
2
347 to 360
500
400
760
3
500 MCM
WIRE
QTY
WIRE
GAUGE
MULTI POINT CONNECTION, OPTIONAL
COMPRESSOR (EACH)
CHILLER (PER CIRCUIT)
DISC.
POWER
MOP
SWT.
BLOCK
[Amp]
[Amp]
[Amp]
RLA
[Amp]
LRA
[Amp]
QTY
MCA [Amp]
100 to 104
132
1
125 to 130
225 Amps
200
N/A
3
1 GA
105 to 111
132
1
132 to 139
225 Amps
200
N/A
3
1/0
112 to 120
132
1
140 to 150
250 Amps
200
N/A
3
1/0
121 to 133
165
1
152 to 167
250 Amps
225
N/A
3
2/0
134 to 140
165
1
168 to 175
300 Amps
225
N/A
3
2/0
141 to 150
165
1
177 to 188
300 Amps
225
N/A
3
3/0
151 to 155
176
1
189 to 194
300 Amps
250
N/A
3
3/0
156 to 160
176
1
195 to 200
350 Amps
250
N/A
3
3/0
Catalog 602-2
35
WMC 400D 3/60/460 ONLY
Table 22, WMC 400D-B, 3/60/460
SINGLE POINT CONNECTION, STANDARD
COMPRESSOR (EACH)
CHILLER
DISC.
POWER
SWT.
BLOCK
[Amp]
[Amp]
RLA
[Amp]
LRA
[Amp]
QTY
MCA
[Amp]
MOP
[Amp]
126
176
2
284
400
400
760
3
127 to 137
176
2
286 to 309
400
400
760
3
138
176
2
311
400
400
760
3
139 to 148
176
2
313 to 334
450
400
760
3
149 to 153
176
2
336 to 345
450
400
760
3
154 to 160
176
2
347 to 361
500
400
760
3
WIRE
QTY
WIRE
GAUGE
300
MCM
350
MCM
400
MCM
400
MCM
500
MCM
500
MCM
MULTI-POINT CONNECTION, OPTIONAL
COMPRESSOR (EACH)
36
RLA
[Amp]
LRA
[Amp]
QTY
MCA
[Amp]
126 to 133
134 to 140
141 to 155
176
176
176
2
2
2
157 to 166
167 to 175
176 to 193
156 to 160
176
2
195 to 200
CHILLER (PER CIRCUIT)
DISC.
POWER
MOP
SWT.
BLOCK
[Amp]
[Amp]
[Amp]
250
250
N/A
300
250
N/A
300
250
N/A
350
250
N/A
WIRE
QTY
WIRE
GAUGE
3
3
3
2/0
2/0
3/0
3
3/0
Catalog 602-2
Notes for following field wiring diagram
1. The compressor front end box is factory mounted
and wired. All incoming line side wiring must be
in accordance with the NEC and be made with
copper wire and copper lugs only. Use only
copper supply wires with ampacity based on
75°c conductor rating. Main power wiring
between the front end box and compressor
terminals is factory installed.
2. Minimum wire size for 115 VAC is 12 ga. for a
maximum length of 50 feet. If greater than 50
feet refer to Daikin McQuay for recommended
wire size minimum. Wire size for 24 VAC is 18
ga. All wiring to be installed as NEC Class 1
wiring system. All 24 VAC wiring must be run in
separate conduit from 115 VAC wiring. Wiring
must be wired in accordance with NEC and
connection to be made with copper wire and
copper lugs only.
3. Voltage unbalance not to exceed 2% with a
resultant current unbalance of 6 to 10 times the
voltage unbalance per NEMA MG-1, 1998
Standard. Voltage variation is +/- 10% of
nameplate voltage.
4. A customer furnished 24 or 120 VAC power for
alarm relay coil may be connected between
UTB1 terminals 84 power and 81 neutral of the
control panel. For normally open contacts wire
between 82 & 81. For normally closed wire
between 83 & 81. The alarm is operator
programmable. Maximum rating of the alarm
relay coil is 25 VA.
5. Remote on/off control of unit can be
accomplished by installing a set of dry contacts
between terminals 70 and 54.
Catalog 602-2
6. If field supplied flow switches are used in
addition to the factory-mounted flow switches,
they must be wired as shown and be suitable for
24vac and low current application.
7. Customer supplied 115 VAC 20 amp power for
optional evaporator and condenser water pump
control power and tower fans is supplied to unit
control terminals (UTB1) 85 power / 86 neutral,
PE equipment ground.
8. Optional customer supplied 115 VAC, 25 VA
maximum coil rated, chilled water pump relay
(ep1 & 2) may be wired as shown. This option
will cycle the chilled water pump in response to
chiller demand.
9. The condenser water pump must cycle with the
unit. A customer supplied 115 VAC 25 VA
maximum coil rated, condenser water pump
relay (CP1 & 2) is to be wired as shown. Units
with free-cooling must have condenser water
above 60°F before starting.
10. Optional customer supplied 115 VAC 25 VA
maximum coil rated cooling tower fan relays
(C1 - C2 standard, C3-C4 optional) may be
wired as shown. This option will cycle the
cooling tower fans in order to maintain unit
head pressure.
11. Auxiliary 24 VAC rated contacts in both the
chilled water and condenser water pump starters
may be wired as shown for additional flow
protection.
12. A 4-20 mA external signal for chilled water
reset can be wired to terminals 71 and 51 on the
unit controller; load limit is wired to terminals
71 and 58 on the unit controller.
37
38
A
H
A
H
A
H
A
C2
* NOTE10
C3
O
*COOLINGTOWERVFD
POWER
* NOTE4
COMMON
0-10VDC
0-10VDC
C1
* NOTE10
O
O
* NOTE10
C4
* NOTE10
O
*COOLINGTOWERBYPASSVALUE
* COOLING
TOWER
FIRST
STAGE
STARTER
* COOLING
TOWER
SECOND
STAGE
STARTER
* COOLING
TOWER
THIRD
STAGE
STARTER
* COOLING
TOWER
FOURTH
STAGE
STARTER
H
POWER
* NOTE7
NEUTRAL
GND
81
A
(NOTE6)
SWITCH
DELTA P
FLOWOR
COND.
* NOTE8
NOTE11
EP2
* NOTE8
75
76
84
53
71
71
52
83(NC)
82(NO)
CF2
EF2
EF1
*ALARM RELAY
(NOTE4)
EWI-1
H
O
AC
EWI-2
H
O
AC
NOTE11
CP1
* NOTE9
NOTE11
CP2
* NOTE9
77
(NOTE6)
SWITCH
DELTA P
FLOWOR
EVAP.
MODESWITCH
EP1
*
* REMOTE
ON/OFF
(NOTE5)
NOTE11
CF1
70
55
54
78
73
79
86
86
74
80
86
85
PE
MICROTECHCONTROL
BOXTERMINALS
(115V) (24V)
UTB1
AC
H
CWI-1
O
CWI-2
H
O
AC
* CONDENSER
WATER
PUMP
STARTERS
* CHILLED
WATER
PUMP
STARTERS
Figure 14, Field Wiring Diagram
See notes on page 37.
Catalog 602-2
Power Factor Correction
Do not use power factor correction capacitors with
WMC chillers. Doing so can cause harmful
electrical resonance in the system. Correction
capacitors are not necessary since VFDs inherently
maintain high power factors.
The full load power factor exceeds 0.90 for all
units.
VFD Line Harmonics
Despite their many benefits, care must be taken
when applying VFDs due to the effect of line
harmonics on the building electric system. VFDs
cause distortion of the AC line because they are
nonlinear loads, that is, they don't draw sinusoidal
current from the line. They draw their current from
only the peaks of the AC line, thereby flattening
the top of the voltage waveform. Some other
nonlinear loads are electronic ballasts and
uninterruptible power supplies.
Line harmonics and their associated distortion can
be critical to ac-drives for three reasons:
1. Current harmonics can cause additional
heating to transformers, conductors, and
switchgear.
2. Voltage harmonics upset the smooth
voltage sinusoidal waveform.
3. High-frequency components of voltage
distortion can interfere with signals
transmitted on the AC line for some
control systems.
The harmonics of concern are the 5th, 7th, 11th, and
13th. Even harmonics, harmonics divisible by three,
and high magnitude harmonics are usually not a
problem.
Current Harmonics
An increase in reactive impedance in front of the
VFD helps reduce the harmonic currents. Reactive
impedance can be added in the following ways:
1. Mount the drive far from the source
transformer.
2. Add line reactors. They are standard
equipment on Magnitude chillers.
3. Use an isolation transformer.
4. Use a harmonic filter.
Voltage Harmonics
Voltage distortion is caused by the flow of
harmonic currents through a source impedance. A
reduction in source impedance to the point of
Catalog 602-2
common coupling (PCC) will result in a reduction
in voltage harmonics. This can be done in the
following ways:
1. Keep the PCC as far from the drives
(close to the power source) as possible.
2. Increase the size (decrease the
impedance) of the source transformer.
3. Increase the capacity (decrease the
impedance) of the busway or cables from
the source to the PCC.
4. Make sure that added reactance is
"downstream" (closer to the VFD than
the source) from the PCC.
Line Reactors
Five-percent line reactors are standard equipment
on Magnitude chillers and located in each
compressors power panel. They are employed to
improve the power factor by reducing the effects
of harmonics.
Harmonic Filter
The harmonic filter is an option for field mounting
and wiring outside of the power panel. It works in
conjunction with the line reactor to further
minimize harmonic distortion. IEEE 519-1991
Standard defines acceptable limits.
See the Magnitude installation manual and
certified drawings for harmonic filter installation
information.
EMI (Electro Magnetic Interference) and RFI
(Radio Frequency Interference) Filter
This filter is a factory-installed option. The terms
EMI and RFI are often used interchangeably. EMI
is actually any frequency of electrical noise,
whereas RFI is a specific subset of electrical noise
on the EMI spectrum. There are two types of EMI.
Conducted EMI is unwanted high frequencies that
ride on the AC wave form.
EMI-Radiated EMI is similar to an unwanted
radio broadcast being emitted from the power
lines. There are many pieces of equipment that can
generate EMI, variable frequency drives included.
In the case of variable frequency drives, the
electrical noise produced is primarily contained in
the switching edges of the pulse width modulation
(PWM) controller.
As the technology of drives evolves, switching
frequencies increase. These increases also increase
the effective edge frequencies produced, thereby
increasing the amount of electrical noise.
39
The power line noise emissions associated with
variable frequency and variable speed drives can
cause disturbances in nearby equipment. Typical
disturbances include:











40
Dimmer and ballast instability
Lighting disturbances such as flashing
Poor radio reception
Poor television reception
Instability of control systems
Flow meter totalizing
Flow metering fluctuation
Computer system failures loss of data
Radar disruption
Sonar disruption
Thermostat control problems
The IEEE 519-1991 Standard
The Institute of Electrical and Electronics
Engineers (IEEE) has developed a standard that
defines acceptable limits of system current and
voltage distortion. A simple form is available from
McQuay International that can be used to perform
a harmonics analysis and to determine compliance
with IEEE 519-1991.
Line reactors, isolation transformers, or phaseshifting transformers can be required on some
installations.
Catalog 602-2
Application
Considerations
Location
WMC chillers are intended only for installation in
an indoor or weather protected area consistent with
the NEMA 1 rating on the chiller, controls, and
electrical panels. Equipment room temperature for
operating and standby conditions is 40°F to 122°F
(4.4°C to 50°C).
Optimum Water
Temperatures and Flow
A key to improving energy efficiency for any
chiller is minimizing the compressor pressure lift.
Reducing the lift reduces the compressor work and
its energy consumption per unit of output. The
chiller typically has the largest motor of any
component in a chilled water system.
Higher leaving chilled water
temperatures
Warmer leaving chilled water temperatures will
raise the compressor’s suction pressure and
decrease the lift, improving efficiency. Using 45F
(7.0C) leaving water instead of 42F (5.5C) will
make a significant improvement.
Evaporator temperature drop
The industry standard has been a 10-degree F (5.5
degree C) temperature drop in the evaporator.
Increasing the drop to 12 or 14 degrees F (6.6 or
7.7 degrees C) will improve the evaporator heat
transfer, raise the suction pressure, and improve
chiller efficiency. Chilled water pump energy will
also be reduced.
energy consumption by two percent. Cooler water
lowers the condensing pressure and reduces
compressor work. One or two degrees can make a
noticeable difference. The incremental cost of a
larger tower can be small and provide a good
return on investment.
Condenser water temperature rise
The industry standard of 3 gpm/ton or about a 9.5degree delta-T seems to work well for most
applications. Reducing condenser water flow to
lower pumping energy will increase the water
temperature rise, resulting in an increase in the
compressor’s condensing pressure and energy
consumption. This is usually not a productive
strategy.
Chilled Water Temperature
The maximum temperature of water entering the
chiller on standby must not exceed 110 F (43 C).
Maximum temperature entering on start-up must
not exceed 90F (32.2C). Minimum chilled water
leaving temperature without antifreeze is
approximately 36F (2.2C).
Piping
Piping must be adequately supported to remove
weight and strain on the chiller’s fittings and
connections. Be sure piping is adequately
insulated. Install a cleanable 20-mesh water
strainer at the inlet of the evaporator and
condenser. Install enough shutoff valves to permit
draining water from the evaporator or condenser
without draining the complete system.
Do use PVC or CPVC piping for any water lines.
Should a refrigerant-to-water leak occur, POE
lubricant in the refrigerant can have an adverse
effect on the pipe.
Condenser entering water temperature
As a general rule, a one-degree drop in condenser
entering water temperature will reduce chiller
Catalog 602-2
41
Figure 16, Tower Bypass, Cold Weather
Operation (Bypass Indoors)
Condenser Water
Temperature
When the ambient wet bulb temperature is lower
than design, the entering condenser water
temperature can be allowed to fall, improving
chiller performance. As chillers are selected for
lower kW per ton, the cooling tower fan motor
power becomes a higher percentage of the peak
load chiller power. To obtain the lowest possible
energy cost, the interaction between compressor
power, fan power, and pumping power should all
be studied.
Even with tower fan control, some form of water
flow control such as tower bypass or variable
speed condenser water flow may be required to
maintain minimum acceptable entering condenser
water temperatures. must be used. The MicroTech
II control is capable of controlling tower fans and
bypass valve directly or indirectly through an
output signal to the building automation system
ensure stable and efficient chiller operation.
Figure 15 and Figure 16 illustrate two temperature
actuated tower bypass arrangements. The “Cold
Weather” scheme, Figure 16, provides better
startup under cold ambient air temperature
conditions. The bypass valve and piping are
indoors and thus warmer, allowing for warmer
water to be immediately available to the
condenser. The check valve may be required to
prevent air at the pump inlet.
!
CAUTION
Freeze Notice: The evaporator and
condenser are not self-draining. Both must
be blown out to completely remove water
to help prevent freeze up.
Figure 15, Tower Bypass, Mild Weather
Operation
≈
42
≈
≈
≈
Pumps
To avoid the possibility of objectionable
harmonics in the system piping, 4-pole,
1800/1500 rpm system pumps should be used.
The condenser water pump(s) must be cycled
off when the last chiller of the system cycles
off. This will keep cold condenser water from
migrating refrigerant to the condenser. Cold
liquid refrigerant in the condenser can make
start up difficult. In addition, turning off the
condenser water pump(s) when the chillers are
not operating will conserve energy.
Include thermometers and pressure gauges at
the chiller inlet and outlet connections and
install air vents at the high points of piping.
Where noise and vibration are critical and the
unit is mounted on spring isolators, flexible
piping and conduit connections are necessary.
Install a flow switch or pressure differential
switch in the leaving chilled water line, if one is
not factory installed.
Variable Speed Chilled
Water Pumping
Variable speed pumping involves changing
system water flow relative to cooling load
changes. Daikin McQuay centrifugal chillers
are designed for this duty with two limitations.
First, the rate of change in the water flow needs
to be slow, not greater than 10% of the change
per minute. The chiller needs time to sense a
load change and respond.
Second, the water velocity in the vessels must
be 3 to 10 fps (0.91 and 3.0 m/sec). Below 3 fps
(0.91 m/sec), laminar flow occurs which
reduces heat transfer and causes erratic
operation. Above 10 fps (3.0 m/sec),
excessively high pressure drops and tube
erosion occur. These flow limits can be
Catalog 602-2
determined from the Daikin McQuay selection
program.
We recommend variable flow only in the
evaporator because there is virtually no change in
chiller efficiency compared to constant flow. In
other words, there is no chiller energy penalty and
considerable pumping energy can be saved.
Although variable speed pumping can be done in
the condenser loop, it is usually unwise. The intent
of variable flow is to reduce pump horsepower.
However, reducing condenser water flow increases
the chiller’s condensing pressure, increasing the
lift that the compressor must overcome which, in
turn, increases the compressor’s energy use.
Consequently, pump energy savings can be lost
because the chiller operating power is significantly
increased.
Low condenser flow and tube velocities can cause
premature tube fouling and subsequent increased
compressor power consumption. Increased
cleaning and/or chemical use can also result.
Vibration Mounting
during the low load period and the desired cycle
time for the compressors.
Assuming that there are no sudden load changes
and the chiller plant has reasonable turndown, a
rule of thumb of “gallons of water volume equal
to two to three times the chilled water gpm flow
rate” is often used.
A properly designed storage tank should be
added if the system components do not provide
sufficient water volume.
Pump Control
Operation of the chilled water pump can be to:
1) cycle the pump with the unit
2) operate continuously
3) cycle automatically by a remote source
The cooling tower pump must cycle with the
compressor. The holding coil of the cooling
tower pump motor starter must be rated at 115
volts, 60 Hz, with a maximum volt-amperage
rating of 100. A control relay is required if the
voltage-amperage rating is exceeded. See the
Field Wiring Diagram on page 38 or in the
cover of control panel for proper connections.
The Magnitude chillers are almost vibration-free.
Consequently, floor mounted spring isolators are
not usually required. Rubber mounting pads are
shipped with each unit. It is wise to continue to
use piping flexible connectors to reduce sound
transmitted into the pipe and to allow for
expansion and contraction.
All interlock contacts must be rated for no less
than 10 inductive amps. The alarm circuit
provided in the control center utilizes 115-volts
AC. The alarm used must not draw more than
10-volt amperes.
System Water Volume
System analysis
All chilled water systems need adequate time to
recognize a load change, respond to that load
change and stabilize, without undesirable short
cycling of the compressors or loss of control. In
air conditioning systems, the potential for short
cycling usually exists when the building load falls
below the minimum chiller plant capacity or on
close-coupled systems with very small water
volumes.
Some of the things the designer should consider
when looking at water volume are the minimum
cooling load, the minimum chiller plant capacity
Although McQuay International is a proponent
of analyzing the entire system, it is generally
effective to place the chiller in the most
efficient mode because it is a large energy
consumer.
The McQuay Energy Analyzer program is an
excellent tool to investigate the entire system
efficiency, quickly and accurately. It is
especially good at comparing different system
types and operating parameters. Contact you
local Daikin McQuay sales office for assistance
on your particular application.
Catalog 602-2
43
Retrofit Knockdown
It is estimated that fifty percent of retrofit
applications require partial or complete
disassembly of the chiller. Daikin McQuay offers
two solutions to the disassembly and reassembly
effort on Magnitude chillers.
The unit is shipped without refrigerant, which must
be furnished and charged by the contractor.
Type IV reduces the height and weight of the unit.
The width is determined by the evaporator tube
sheet and is not decreased with this arrangement,
nor is the overall unit length. If further weight or
size reduction is required, the vessels can be
separated by unbolting them.
Magnitude chillers are relatively easy to
disassembly due to the small compressor size,
simplified refrigerant piping and the absence of a
lubrication system with its attendant components
and piping. Two knockdown arrangements are
available as options
TYPE V: The unit ships fully assembled and
charged with refrigerant and is ready for field
knockdown. This option allows components to be
removed as required at the site. The unit dimension
drawing gives sufficient dimensions to determine
what components should be removed.
Contact local McQuay Factory Service for pricing
and scheduling of required installation
supervision.
TYPE IV: The compressor(s), control panel, and
compressor power panel(s) are removed at the
factory and put on skids. The stripped vessel stack
is shipped as a single piece. Discharge piping,
liquid line and the compressor cooling line(s) are
removed and crated. All associated wiring and
piping possible will remain on the vessel stack.
Type V gives the installing contractor the option to
remove only those components necessary to
complete the installation. The refrigerant is
pumped down into the condenser and depending
on the degree of knockdown, can remain there,
decreasing the leak testing, evacuation and
charging required in the field.
Table 23, Component Weight
Evaporator
Condenser
WMC
Model
Compressor
Each
Model
Weight
Model
Weight
145S
282
E2209
2490
C2009
2142
145D
262
E2209
2490
C2009
2142
150D
262
E2212
2857
C2012
2615
250D
282
E2609
3259
C2209
2392
290D
282
E2612
3812
C2212
2942
400D
282
E3012
5075
C2612
3900
NOTES:
1. All weights in pounds.
2. “S” models have one compressor; “D” models have two compressors.
Table 24, Component Dimensions, (Length x Width x Height)
WMC
Model
Compressor
Power
Panel (2)
Control
Panel (2)
Evaporator
Model
Condenser
Model
Stack
145S
32 x 22 x 18
14 x 34 x 67
9 x 16 x 33
E2209
135 x 28 x 29
C2009
128 x 36 x 33 135 x 36 x 62
145D
32 x 18 x 18
14 x 34 x 67
9 x 16 x 33
E2209
135 x 28 x 29
C2009
128 x 36 x 33 135 x 36 x 62
150D
32 x 18 x 18
14 x 34 x 67
9 x 16 x 33
E2212
170 x 28 x 29
C2012
164 x 36 x 33 170 x 36 x 62
250D
32 x 22 x 18
14 x 34 x 67
9 x 16 x 33
E2609
130 x 32 x 33
C2209
135 x 39 x 33 135 x 39 x 66
290D
32 x 22 x 18
14 x 34 x 67
9 x 16 x 33
E2612
165 x 32 x 33
C2212
170 x 39 x 33 170 x 39 x 66
400D
32 x 22 x 18
14 x 34 x 67
9 x 16 x 33
E3012
169 x 36 x 36
C2612
165 x 44 x 36. 169 x 44 x 72
NOTES:
1. All dimensions in inches.
2. Panel dimensions are Depth x Width x Height
44
Catalog 602-2
Pressure Drop Curves
NOTE: The Evaporator and Condenser Model Codes are shown on page 27. The -B and -C designations shown on the
curves refer to vessel tube count, which is determined by the computer selection program.
Figure 17, Single Pass Evaporators
WMC Evap - Water Side Pressure Drop
(1 pass)
30
E2212-B
E2212-C
E2212-D
25
E2209-B
E2209-C
EPD - ft
20
E2209-D
E2612-B
E2609-B
15
E3012-B
E3012-C
10
5
0
0
500
1000
1500
2000
2500
3000
3500
4000
EGPM - gpm
Figure 18, Single Pass Condensers
WMC Cond - Water Side Pressure Drop
(1 pass)
25.0
C2012-B
C2012-C
20.0
C2009-B
C2009-C
C2212-B
C2212-C
15.0
CPD - ft
C2209-B
C2209-C
C2612-B
10.0
C2612-C
5.0
0.0
0
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
CGPM - gpm
Catalog 602-2
45
Figure 19, 2-Pass Evaporators
WMC Evap - Water Side Pressure Drop
(2 pass)
60
E2212-B
E2212-C
E2212-D
50
E2209-B
E2209-C
E2209-D
40
EPD - ft
E2612-B
E2609-B
E3012-B
30
E3012-C
20
10
0
0
500
1000
1500
2000
EGPM - gpm
Figure 20, 2-Pass Condensers
WMC Cond - Water Side Pressure Drop
(2 pass)
35.0
C2012-B
C2012-C
30.0
C2009-B
C2009-C
25.0
C2212-B
CPD - ft
C2212-C
C2209-B
20.0
C2209-C
C2612-B
15.0
C2612-C
10.0
5.0
0.0
0
500
1000
1500
2000
2500
CGPM - gpm
46
Catalog 602-2
Figure 21, 3-Pass Evaporators
WMC Evap - Water Side Pressure Drop
(3 pass)
90
E2212-C
E2212-D
80
E2209-C
E2209-D
70
E2612-B
E2609-B
EPD - ft
60
E3012-C
50
40
30
20
10
0
0
200
400
600
800
1000
1200
EGPM - gpm
Figure 22, 3-Pass Condensers
WMC Cond - Water Side Pressure Drop
(3 pass)
60.0
C2012-C
C2009-C
50.0
C2212-C
C2209-C
CPD - ft
40.0
C2612-C
30.0
20.0
10.0
0.0
0
200
400
600
800
1000
1200
1400
CGPM - gpm
Catalog 602-2
47
Options and Accessories
Vessels
Marine water boxes
Provides tube access for inspection, cleaning, and removal without dismantling water piping.
Flanges (Victaulic connections are standard)
ANSI raised face flanges on either the evaporator and/or condenser. Mating flanges are by others.
Water side vessel construction of 300 psi (150 psi is standard)
For high pressure water systems, typically high-rise building construction.
Single insulation, 3/4 inch, on evaporator (including heads) and suction piping
Insulation, either optional factory-installed or field-installed is generally required on all installations.
Double insulation, 1-½ inch, on evaporator (including heads) and suction piping
For high humidity locations and ice making applications.
Special vessel codes
Including Chinese and Canadian Registration (CRN).
Controls
BAS interface module.
Factory-installed on the unit controller for the applicable protocol being used. (Can also be retrofit)
 BACnet MS/TP
 LONWORKS (FTT-10A)
 BACnet IP
 Modbus RTU
 BACnet Ethernet
Unit
Export packaging
Can be either slat or full crate for additional protection during shipment. Units normally shipped in containers.
Pumpout Unit, with or without storage vessel
Available in a variety of sizes. Details are in Catalog WSCWDC.
Refrigerant monitor
For remote mounting including accessories such as 4-20ma signal, strobe light, audible horn, air pick-up filter.
Extended warranties
Extended 1, 2, 3, or 4 year warranties for parts only or for parts and labor are available for the entire unit, entire unit
plus refrigerant, or compressor/motor only.
Witness performance test
The standard full load run test is performed in the presence of the customer under the supervision of a factory engineer,
includes compilation of the test data. Travel and local expenses are not included.
Certified performance test
The standard run test is performed under the supervision of a factory engineer; data is compiled and certified.
Approvals/listings
AHRI Approval and ETL/CETL listing is standard. MEA is optional.
48
Catalog 602-2
Seismic Certification
Unit is OSHPD Pre-Approved and so labeled. (California only).
Unit is certified to IBC 2009 and so labeled.
Electrical
Multi-point power connection
Provides separate power connection to each compressor disconnect switch on two compressor units in lieu of standard
single-point power.
High short circuit current rating
65 kA (at 460 V) panel rating. (Standard is 35 kA).
Harmonic filter
Field-installed option. See page 39 for details.
EMI filter
Factory-installed option. Radio interference filter. See page 39 for details.
Ground Fault Protection
Protects equipment from arcing ground fault damage from line-to-ground fault currents less than those required for
conductor protection.
Special Order Options
The following special order options are available; requiring factory pricing, additional engineering and possible
dimension changes and/or extended delivery:
 Non-standard location of nozzle connections on heads (compact water boxes) or marine water boxes
 Special corrosion inhibiting coatings on any “wetted surface” including tubesheets, heads (compact water boxes),
marine water boxes, or nozzles
 Clad tube sheets
 Sacrificial anodes in heads (compact water boxes) or marine water boxes
 Eddy current testing and report used to verify baseline tube condition
 Special NEMA enclosures
 Davits or hinges for marine water box covers or heads (compact water boxes)
 Accelerometer and vibration monitoring pickup mounting
 Spacer rings on heads to accommodate automatic tube brush cleaning systems (installed by others)
Catalog 602-2
49
Refrigerant Recovery Units
Although Daikin McQuay chillers can pump the entire refrigerant charge into the condenser and valve it off, there
are occasions when pumpout units are required, due purely to specification requirements or unusual job
considerations.
Daikin McQuay offers two sizes of refrigerant recovery units (Model RRU) and one recovery unit that is factory
mounted on a storage vessel (Model PRU). Recovery units are ETL listed. Capacities for R-22 are AHRI certified.
The storage tank is designed, constructed and stamped in accordance with ASME standards.
Model RRU Refrigerant Recovery Units
RRU134-5
RRU134-3
(1) R-22 Liquid
Transfer Rate
lb/m (kg/m)
55 (25)
55 (25)
(1) R 22 Vapor
Transfer Rate
lb/m (kg/m)
1.56 (0.71)
1.56 (0.71)
RRU570-3
RRU570-V
RRU570-R
RRU570-D
325 (148)
325 (148)
325 (148)
325 (148)
6.0 (2.7)
6.0 (2.7)
6.0 (2.7)
6.0 (2.7)
Model
115 (52)
115 (52)
Dimensions
LxWxH
Inch (cm)
21 x 14 x 19 (53 x 36 x 68)
21 x 14 x 19 (53 x 36 x 68)
1/50-60/110-115
1/50-60/220-230
190 (86)
190 (86)
190 (86)
190 (86)
26 x 25 45 (66 x 63 x 114)
26 x 25 45 (66 x 63 x 114)
26 x 25 45 (66 x 63 x 114)
26 x 25 45 (66 x 63 x 114)
1/50-60/220-230
3/50-60/220-230
3/50-60/360-460
3/60/575
Comp.
HP
(2) Chiller
Tons (kW)
Weight
lbs (kg)
1.5
1.5
300 (1050)
300 (1050)
3
3
3
3
1000 (3500)
1000 (3500)
1000 (3500)
1000 (3500)
Electrical
Size and Specifications
NOTES:
1. Transfer rate for R-22 is AHRI certified. R-134a capacity is given below in each unit's description.
2. Suggested maximum chiller capacity.
Refrigerant Compatibility
Units are suitable for use with the following refrigerants normally found on Daikin McQuay chillers; R-12, R-22,
R-134a, R-410A, and R-500.
Standard Equipment
Equipment
Model
RRU134
RRU570
Power Cord
X
X
Filter-Driers
(2) 30 cu. in.
(1) 48 cu. in
Electromechanical Control
Hoses
X
X
(4) 10 ft.
(1) 10 ft + (2) 20 ft
Reducing Fittings
X
12 ft. Tank Float Switch Cable
Connection Sizes
X
½ in. Flare
¾ in. Flare
Model RRU134
Large 1-½ HP open drive compressor, ½-inch lines, two-point vapor extraction
and oversized air-cooled condenser speed recovery on smaller size chillers.
Purging and switching from liquid to vapor recovery only involves turning 3-way
valves-no switching of hoses is necessary. Capacity with R-134a is 55 lb/min
liquid, 1.34 lb/min vapor.
50
Catalog 602-2
MODEL RRU570
Recovers at R-134a at 300 lb/min liquid and 5.7 lb/min vapor, ideal for the
medium size chiller job. Rugged 3 hp open-drive compressor provides years of
reliable service, even on refrigerants heavily contaminated with oil, air, moisture,
or acids. Purging and switching from liquid to vapor recovery only involves
turning 3-way valves-no switching of hoses is necessary. Suitable for most highpressure refrigerants and blends. Equipped with air-cooled condenser.
Model PRU Packaged Recovery Units
The Model RRU134 transfer unit can be factory-mounted on a storage vessel
providing a packaged unit with a R-134a transfer capacity of 55 lb/min liquid
and 1.34 lb/min of vapor combined with a storage vessel with a capacity of 2105
pounds of R-134a. Includes (2) 20-ft. hoses.
Model
R-22 Liquid
Transfer Rate
lb/m (kg/m)
R-22 Vapor
Transfer Rate
lb/m (kg/m)
Weight
lb (kg)
Length
in (cm)
Width
in (cm)
Height
in (cm)
Electrical
PRU134-5
55 (25)
1.56 (0.71)
770 (349)
94 (239)
30 (76)
55 (139)
1/50-60/110-115
PRU134-3
55 (25)
1.56 (0.71)
770 (349)
94 (239)
30 (76)
55 (139)
1/50-60/220-230
Unit
Accessories
RHK-120
1.25 in. x 10 ft. hose with ball valves
RHK-240
1.25 in. x 20 ft. hose with ball valves
Refrigerant Monitors





Detects all halogen based refrigerants
Optional analog output for remote monitoring
Visual alarm indication
Fresh air inlet for automatic re-zeroing
ETL listed





Continuous digital display of system status
System malfunction detection and indication
Can sample up to 250 feet (76 meters) away
Multi-unit capability in a single monitor
UL STD 3101-1 and CAN/CSA 1010.1
MODELS
Model RM-1 1 Zone Monitor
Model RM-4 4 Zone Monitor
Model RM-8 8 Zone Monitor
Model RM-16 16 Zone Model
Catalog 602-2
51
SPECIFICATIONS
Sensitivity: As low as 1 PPM
Range: 0 to 1000 PPM
Weight: 25 lbs. (11 kg)
Power: 120/240 Volt, 50/60 Hz
Operating Environment: 32F-125F
Size: W=16.5in. D=6.75in. H=15in.
Alarm Trip Points (Percent of Full Scale): Low Alarm=0 to 100, Main Alarm=0 to 100, High Alarm=100
Alarm Outputs: Indicator Light, Alarm Relays, RS232 Computer Interface
OPTIONS and ACCESSORIES
Analog Output, 4-20 ma (RMA-AO)
Remote Strobe Light, 120 V (RMA-L)
Remote Horn, 120V (RMA-H)
Remote Light and Horn Set (RMA-LH)
Plastic Pick-up Tubing, ¼ inch OD, 250 ft. Reel (RMA-T)
Diaphragm Pump (RMA-P) *
Course Replacement Filter (RMA-CF) *
5 Micron Replacement Filter (RMA-F) *
(*) Replacement parts. Original pump and filters are shipped with unit.
SYSTEM DESCRIPTION
Item
1
2
3
4
5
6
7
8
Description
16 gauge
3 conductor wire
18 or 22 gauge
2 conductor cable
2 conductor twisted
pair shielded cable
Remote horn
Remote strobe light
Remote horn and
strobe light set
1/4 in. x 1/8 in. ID
plastic pick-up tubing
Course filter
Required
Supplied
with
Unit
Supplied
by
Customer
Yes
No
Yes
Optional
Available
from
Daikin
McQuay
No
No
Yes
No
No
Yes
No
No
No
Yes
Yes
Yes
Yes
No
Yes
Yes
Yes
No
Yes
Yes
Comments
Yes
Required for horn,
strobe, or combination
Required for remote
analog output
Available in 250 foot
reels
For mounting at the
end of the tubing
Figure 23, Refrigerant Monitor Diagram
52
Catalog 602-2
Specifications
SECTION 15XXX
MAGNETIC BEARING CENTRIFUGAL CHILLERS
PART 1 - GENERAL
1.1 SUMMARY
A. Section includes design, performance criteria, refrigerants, controls, and installation requirements for
water-cooled centrifugal chillers.
1.2 REFERENCES
A. Comply with the following codes and standards:
•
•
•
•
•
•
•
AHRI 550/590
AHRI 575
NEC
ANSI/ASHRAE 15
OSHA as adopted by the State
ETL
ASME Section VIII
1.3 SUBMITTALS
A. Submittals shall include the following:
1.
Dimensioned plan and elevation view, including required clearances, and location of all field piping
and electrical connections.
2.
Summaries of all auxiliary utility requirements such as: electricity, water, air, etc. Summary shall
indicate quality and quantity of each required utility.
3.
Diagram of control system indicating points for field interface and field connection. Diagram shall
fully depict field and factory wiring.
4.
Manufacturer's certified performance data at full load plus IPLV or NPLV.
5.
Installation and Operating Manuals.
1.4 QUALITY ASSURANCE
A. Regulatory Requirements: Comply with the codes and standards in Section 1.2.
B. Chiller manufacturer plant shall be ISO Certified.
C. The chiller shall be tested to job conditions at the manufacturer's plant.
1.5 DELIVERY AND HANDLING
A. Chillers shall be delivered to the job site completely assembled and charged with refrigerant R134a and be
shipped on skids with a weather resistant cover.
-- OR -A. (For Type IV Knockdown) The compressor(s) and control and power panel(s) shall be removed at the
factory and shipped on skids. The stripped vessel stack shall be shipped as a single piece. Discharge
piping, liquid line and the compressor cooling lines shall be removed and crated. All associated wiring
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53
and piping possible will remain on the vessel stack. The unit shall be shipped without refrigerant, which
must be furnished and charged by the installing contractor.
-- OR -A. (For Type V Knockdown) The unit shall be delivered to the job site completely assembled and charged
with refrigerant (pumped down into condenser) and ready for field knockdown, as determined by the
installing contractor.
B. Comply with the manufacturer's instructions for rigging and transporting units. Leave protective covers
in place until installation.
1.6 WARRANTY
A. The chiller manufacturer's warranty shall cover parts and labor costs for the repair or replacement of
defects in material or workmanship for a period of one year from equipment startup or 18 months from
shipment, whichever occurs first. Warranty support shall be provided by company direct or factory
authorized service permanently located near the job site.
-- OR -A. The chiller manufacturer's warranty shall cover parts and labor costs for the repair or replacement of
defects in material or workmanship, and include refrigerant for the entire unit, for a period of one year
from equipment startup or 18 months from shipment, whichever occurs first. Warranty support shall be
provided by company direct or factory authorized service permanently located near the job site.
-- OR-A. The chiller manufacturer's warranty shall cover parts and labor costs for the repair or replacement of
defects in material or workmanship, and include refrigerant for the entire unit, for a period of one year
from equipment startup or 18 months from shipment, whichever occurs first, and also include an
additional extended warranty for (one OR two OR three OR four) years on (the entire unit) OR (on
entire unit including refrigerant coverage) OR (compressor and drive train only). Warranty support
shall be provided by company direct or factory authorized service permanently located near the job site.
1.7 MAINTENANCE
A. Maintenance of the chillers in accordance with manufacturer’s recommendations as published in the
installation and maintenance manuals shall be the responsibility of the owner.
PART 2 - PRODUCTS
2.1 ACCEPTABLE MANUFACTURERS
A. Basis of Design - Daikin McQuay Magnitude Model WMC/WME, including the standard product features
and all special features required per the plans and specifications.
B. Equal Products - Equipment manufactured by [ENTER MANUFACTURER NAME HERE] may be
acceptable as an equal. Naming these products as equal does not imply that their standard construction or
configuration is acceptable or meets the specifications. Equipment proposed “as equal”, must meet the
specifications including all architectural, mechanical, electrical, and structural details, all scheduled
performance and the job design, plans and specifications.
2.2 UNIT DESCRIPTION
A. Provide and install as shown on the plans a factory assembled, charged, and tested water-cooled packaged
centrifugal chiller. Chillers shall have no more than two oil-free, magnetic bearing, semi-hermetic
centrifugal compressors (no exceptions). Each compressor shall have an integrated variable-frequency
drive operating in concert with inlet guide vanes for optimized full and part load efficiency. On twocompressor units, the evaporator and condenser refrigerant sides and the expansion valve shall be
54
Catalog 602-2
common and the chiller shall be capable of running on one compressor with the other compressor or any
of its auxiliaries inoperable or removed.
B. Each chiller shall be factory run-tested under load conditions for a minimum of one hour on an AHRI
qualified test stand with evaporator and condenser water flow at job conditions (excluding glycol
applications). Operating controls shall be adjusted and checked. The refrigerant charge shall be adjusted
for optimum operation and recorded on the unit nameplate. Units operating with 50-Hz power shall be
tested with a 50-Hz power supply. Any deviation in performance or operation shall be remedied prior to
shipment and the unit retested if necessary to confirm repairs or adjustments. Manufacturer shall supply
a certificate of completion of a successful run-test upon request.
-- OR –
B.
Each chiller shall under go a [one] OR [two] OR [three] OR [four] or [five] or [ten] point certified
factory performance tested on an AHRI qualified test stand with water at job conditions (excluding
glycol applications). A manufacture’s engineer shall oversee the testing, certify the accuracy of the
computerized results, and then translates the test data onto an easy-to-read spreadsheet provided to the
owner. The tests are to be run as specified in advance and are run to within AHRI tolerance of capacity
and power. 50 Hz units are run tested at 60 Hz to their maximum motor power. Operating controls shall
be adjusted and checked. The refrigerant charge shall be adjusted for optimum operation and recorded
on the unit nameplate. Units operating with 50-Hz power shall be tested with a 50-Hz power supply.
Any deviation in performance or operation shall be remedied prior to shipment and the unit retested if
necessary to confirm repairs or adjustments.
--OR-B.
Each chiller shall under go a [one] OR [two] OR [three] OR [four] or [five] or [ten] point certified
witness performance test on an AHRI qualified test stand with water at job conditions (excluding glycol
applications). A manufacture’s engineer shall oversee the testing in the presence of the owner or
owner’s representative, certify the accuracy of the computerized results, and then translates the test data
onto an easy-to-read spreadsheet provided to the owner. The tests are to be run as specified in advance
and are run to within AHRI tolerance of capacity and power. 50 Hz units are run tested at 60 Hz to their
maximum motor power. Operating controls shall be adjusted and checked. The refrigerant charge shall
be adjusted for optimum operation and recorded on the unit nameplate. Units operating with 50-Hz
power shall be tested with a 50-Hz power supply. Any deviation in performance or operation shall be
remedied prior to shipment and the unit retested if necessary to confirm repairs or adjustments.
C.
[Optional] A certified sound test shall be performed in accordance with AHRI 575 on each chiller at
full load conditions. A manufacturer’s engineer shall oversee the testing and provide a complete sound
report.
2.3 DESIGN REQUIREMENTS
General: Provide a complete water-cooled, semi-hermetic oil-free centrifugal compressor water chiller as
specified herein. The unit shall be provided according to standards indicated in Section 1.2. In general,
unit shall consist of one or two magnetic bearing, completely oil-free centrifugal compressors,
refrigerant, condenser and evaporator, and control systems including integrated variable frequency
drive, operating controls and equipment protection controls. Chillers shall be designed to operate within
an ambient temperature range of 20ºF to 130ºF with a maximum humidity of 95% (non-condensing)
and shall be charged with refrigerant HFC-134a. If manufacturer offers a chiller using any HCFC
refrigerant that is subject to phase out by the Montreal Protocol or the U.S. Clean Air Act, manufacturer
shall provide, in writing, documentation signed by an officer of the company assuring refrigerant
availability and price schedule for a 20-year period.
A. The entire chiller system, including all pressure vessels, shall remain above atmospheric pressure during
all operating conditions and during shut down to ensure that non-condensables and moisture do not
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55
contaminate the refrigerant and chiller system. If any portion of the chiller system is below atmospheric
pressure during either operation or shut down, the manufacturer shall include, at no charge:
1. Purge System
i. A complete purge system capable of removing non-condensables and moisture during
operation and shut-down. The system shall consist of an air cooled condensing unit,
purge condensing tank, pumpout compressor, and control system.
ii. A dedicated condensing unit shall be provided with the purge system to provide a cooling
source whether or not the chiller is running. The condensing unit shall provide a low purge
coil temperature to result in a maximum loss of 0.1 pounds of refrigerant per pound of
purged air.
iii. The purge system shall be connected to a 100% reclaim device.
iv. A 20-year purge maintenance agreement that provides parts, labor, and all preventative
maintenance required by the manufacturer’s operating and maintenance instructions.
2. Annual Oil/Refrigerant Analysis
i. The manufacturer shall also include at no charge for a period of 20 years an annual oil and
refrigerant analysis report to identify chiller contamination due to vacuum leaks. If the
analysis identifies water, acid, or other contaminant levels higher than specified by the
manufacturer, the oil and/or refrigerant must be replaced or returned to the manufacturer’s
original specification at no cost to the owner.
3. Shell Pressurization System
i. The manufacturer shall include a factory-installed and wired system that will enable
service personnel to readily elevate the vessel pressure during shutdown to facilitate leak
testing.
ii. A factory mounted, wired, and installed shell pressurization system shall be provided to
keep air out of the chiller when the unit is not in service. Electric blanket or hot water
circulation system are both acceptable.
B. Performance: Refer to chiller performance rating.
C. Acoustics: Sound pressure for the unit shall not exceed the following specified levels. Provide the necessary
acoustic treatment to chiller as required. Sound data shall be measured in dB according to AHRI Standard
575 and shall include overall dBA. Data shall be the highest levels recorded at all load points.
Octave Band
63Hz
125Hz
250Hz
500Hz
1000Hz
Overall (dBA)
2000Hz
4000Hz
8000Hz
75% Load
50% Load
25% Load
2.4 CHILLER COMPONENTS
A. Compressors:
1. The unit shall utilize magnetic bearing, oil-free, semi-hermetic centrifugal compressors. The
levitated shaft position shall be digitally controlled and shall be monitored by X-axis position
sensor, Y-axis position sensor, and Z-axis position sensor. The compressor drive train shall be
capable of coming to a controlled, safe stop in the event of a power failure by diverting stored
power to the magnetic bearing controls system.
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Catalog 602-2
2. The motor shall be of the semi-hermetic type, of sufficient size to efficiently fulfill compressor
horsepower requirements. It shall be liquid refrigerant cooled with internal thermal sensing
devices in the stator windings. The motor shall be compatible with variable frequency drive
operation.
1.
If unit contains an atmospheric shaft seal, the manufacturer shall provide the following at no
additional charge:
a. 20 year warranty and all preventive maintenance required to maintain the shaft seal
including appropriate disposal of all oil lost through the shaft seal. Such disposal shall be
done in a manner consistent with all Federal, state, and local laws pertaining to disposal
and documentation of appropriate disposal shall be provided
b. Replacement and re-charging on a semi-annual basis, or more often if required, of all oil
lost through the shaft seal
c. 20 year refrigerant replacement warranty for any loss of refrigerant that can be directly
attributable to the failure of the atmospheric shaft seal
2. If the compressor drive motor is an open design the chiller manufacturer shall provide at
no additional charge a self contained air conditioning system in the mechanical space
sized to handle the maximum heat output the open drive motor. The energy required to
operate this air conditioning system shall be added to the chiller power at all rating points
for energy evaluation purposes.
3. If the compressor drive motor uses any form of antifriction bearings (roller, ball, etc) the
chiller manufacturer shall provide the following at no additional charge:
a. A 20 year motor bearing warranty and all preventative maintenance, including
lubrication, required to maintain the bearings as specified in the manufacturer’s operating
and maintenance instructions
b.
At start up a three axis vibration analysis and written report which establishes a baseline
of motor bearing condition.
c.
An annual three axis vibration analysis and written report to indicate the trend of bearing
wear.
3. The chiller shall be equipped with an integrated Variable Frequency Drive (VFD) to
automatically regulate compressor speed in response to cooling load and the compressor pressure
lift requirement. Movable inlet guide vanes and variable compressor speed acting together, shall
provide unloading. The chiller controls shall coordinate compressor speed and guide vane
position to optimize chiller efficiency.
4. Each compressor circuit shall be equipped with a line reactor to help protect against incoming
power surges and help reduce harmonic distortion.
B. Evaporator and Condenser:
The evaporator and condenser shall be separate vessels of the shell-and-tube type, designed,
constructed, tested and stamped according to the requirements of the ASME Code, Section VIII.
Regardless of the operating pressure, the refrigerant side of each vessel will bear the ASME stamp
indicating compliance with the code and indicating a test pressure of 1.1 times the working pressure,
but not less than 100 psig. The tubes shall be individually replaceable and secured to the intermediate
supports without rolling or expanding to facilitate replacement if required.
1. The evaporator shall be flooded type with [0.025 in.] OR [0.028 in.] OR [0.035 in.] wall copper
internally and externally enhanced tubes rolled into carbon steel tubesheets. The water side shall
be designed for a minimum of [150 psig] OR [300 psig]. The refrigerant side shall be designed for
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57
a minimum of 200 psi. Provide intermediate tube supports at a maximum of 24 inch spacing. The
heads shall be [carbon steel] OR [epoxy-coated steel]. Water connections shall be [grooved
suitable for Victaulic couplings] OR [flanged connections]. The evaporator shall have [dished
heads with valved drain and vent connections] OR [shall be equipped with marine water boxes
with removable covers and vent and drain connections]. The evaporator shall have [right-hand]
OR [left-hand] connections when looking at the unit control panel.
2. The condenser shall have [(0.025 in) OR (0.028 in.) OR (0.035 in.) wall copper] OR [(0.028 in.) or
(0.035 in.) wall 90-10 cupro-nickel] internally and externally enhanced tubes rolled into carbon
steel. Water connections shall be [grooved suitable for Victaulic couplings] OR [flanged]. The
water side shall be designed for a minimum of [150 psig] OR [300 psig]. The refrigerant side shall
be designed for a minimum of 200 psi. Provide intermediate tube supports at a maximum of 24
inch spacing. The condenser shall have [dished heads with valved drain and vent connections] OR
[shall be equipped with marine water boxes with removable covers and vent and drain
connections]. The heads shall be [carbon steel] OR [epoxy-coated steel]. The condenser shall have
[right-hand] OR [left-hand] connections when looking at the unit control panel.
3. Provide sufficient isolation valves and condenser volume to hold the full unit refrigerant charge
the condenser at 90ºF in accordance with ANSIASHRAE 15.A during servicing or provide a
separate pumpout system and storage tank sufficient to hold the charge of the largest unit being
furnished.
4. An electronic expansion valve shall control refrigerant flow to the evaporator. Fixed orifice
devices or float controls with hot gas bypass are not acceptable because of inefficient control at
low load conditions. The liquid line shall have moisture indicating sight glass.
5. Re-seating type spring loaded pressure relief valves according to ASHRAE-15 safety code shall be
furnished. The evaporator shall be provided with single or multiple valves. The condenser shall be
provided with dual relief valves equipped with a transfer valve so one relief valve can be removed
for testing or replacement without loss of refrigerant or removal of refrigerant from the condenser.
Rupture disks are not acceptable. If rupture disks are required on negative pressure units to
prevent air and moisture ingress, then factory mounted spring loaded pressure relief valves shall be
provided in series with the rupture disks to contain the remaining refrigerant in the event of vessel
over-pressurization. The space between the rupture disk and the relief valve shall include a
suitable telltale indicator integrated into the chiller control system to alert the operator that a
potential safety issue exists in the pressure relief system.
6. [OPTIONAL] The evaporator, including water heads, suction line, and any other component or
part of a component subject to condensing moisture shall be insulated with UL recognized [3/4
inch] OR [1 ½ inch] closed cell insulation. All joints and seams shall be carefully sealed to form a
vapor barrier.
7. Provide factory-mounted and wired, thermal-dispersion water flow switches on each vessel to
prevent unit operation with no or low water flow. Paddle and pressure differential type switches
are not acceptable due to high rates of failure and false indications from these types of flow
indicators.
C. Long Term Reliability
1.
All compressor/motor designs that require oil to lubricate their respective roller/ball bearing
system must denote exactly how many gallons of oil are required for safe operation. The
manufacturer must then provide the engineer and owner with a real world energy analysis
showing the energy degradation over time due oil contamination of heat transfer surfaces.
2. Chillers containing oil shall include at no additional charge a 10 year parts and labor warranty
on all oil system components including:

58
Pumps

Starter
Catalog 602-2
 Cooler
 Piping
 Controls
 Tank
 Valves
 Heater
3. Manufacturer shall be responsible for covering all costs associated with annual oil and oil filter
changes plus oil analysis as required
D. Vibration Isolation
1. Provide neoprene waffle-type vibration isolators for each corner of the unit.
E. Power Connections
1. Power connection shall be [single point to a factory-mounted disconnect switch] OR [multipoint to
each compressor power panel on two-compressor units].
F. Chiller Control
1. The unit shall have a microprocessor-based control system consisting of a 15-inch VGA touchscreen operator interface and a unit controller.
2. The touch-screen shall display the unit operating parameters, accept setpoint changes (multi-level
password protected) and be capable of resetting faults and alarms. The following parameters shall
be displayed on the home screen and also as trend curves on the trend screen:
• Entering and leaving chilled water temperatures
• Entering and leaving condenser water temperatures
• Evaporator saturated refrigerant pressure
• Condenser saturated refrigerant pressure
• Percent of 100% speed (per compressor)
• % of rated load amps for entire unit
3. In addition to the trended items above, all other important real-time operating parameters shall
also be shown on the touch-screen. These items shall be displayed on a chiller graphic showing
each component. At a minimum, the following critical areas must be monitored:
• Compressor actual speed, maximum speed, percent speed
• Liquid line temperature
• Chilled water setpoint
• Compressor and unit state and input and output digital and analog values
4. A fault history shall be displayed using an easy to decipher, color coded set of messages that are
date and time stamped. Time interval scale shall be user selectable as 20 mins, 2 hours, or 8
hours. The alarm history shall be downloadable from the unit's USB port. An operating and
maintenance manual specific for the unit shall be viewable on the screen.
5. All setpoints shall be viewable and changeable (multi-level password protected) on the touch
screen and include setpoint description and range of set values.
6. Automatic corrective action to reduce unnecessary cycling shall be accomplished through
preemptive control of low evaporator or high discharge pressure conditions to keep the unit
operating through abnormal transient conditions.
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59
7. The chiller shall be capable of cycling and loading up to three other similar chillers through a local
network and also automatic control of evaporator and condenser pumps (primary and standby), up
to 3 stages of cooling tower fan cycling control and a tower modulating bypass valve or cooling
tower fan variable frequency drives.
8. [OPTIONAL] The factory mounted controller(s) shall support operation on a BACnet®,
Modbus® or LONWORKS® network via one of the data link / physical layers listed below as
specified by the successful Building Automation System (BAS) supplier.
• Modbus
• BACnet MS/TP master (Clause 9)
• BACnet IP, (Annex J)
• BACnet ISO 8802-3, (Ethernet)
• LonTalk® FTT-10A. The unit controller shall be LONMARK ® certified.
9. The information communicated between the BAS and the factory mounted unit controllers shall
include the reading and writing of data to allow unit monitoring, control and alarm notification as
specified in the unit sequence of operation and the unit points list.
10. For chillers communicating over a LONMARK network, the corresponding LONMARK eXternal
Interface File (XIF) shall be provided with the chiller submittal data.
11. All communication from the chiller unit controller as specified in the points list shall be via
standard BACnet objects. Proprietary BACnet objects shall not be allowed. BACnet
communications shall conform to the BACnet protocol (ANSI/ASHRAE135-2001). A BACnet
Protocol Implementation Conformance Statement (PICS) shall be provided along with the unit
submittal.
12. The factory supplied VFD and controls should include the following:
 High short circuit panel rating of [35 kA (standard)] OR [65kA at 460V (optional)] with a
field-supplied matching disconnect switch
 Phase loss protection
 Under/over voltage protection
 [OPTIONAL] Ground Fault Protection to reduce the arcing ground fault damage from line-toground fault currents less than those required for conductor protection
 [OPTIONAL] EMI filters to reduce radio frequency interference
13. Energy saving software logic shall at a minimum offer the following
 User programmable compressor soft loading
 Chilled water reset
 Demand limit control
 Staging options lead lag between multiple compressors on a single chiller or up to two other
similar chillers.
 Plotting of historic trends for optimizing efficiency
2.5. OPTIONAL ITEMS
The following optional items shall be furnished:
1. [Open] OR [Closed] export crate
2. Pumpout unit, with or without storage vessel
3. Refrigerant monitor
4. OSHPD Certification: The chiller shall be OSHPD Pre-Approved per OSP–0116-10 and be so labeled. The
chiller shall meet a minimum seismic design spectral response acceleration of 1.60 SDS. The chiller must
be mounted to a rigid base and may use neoprene waffle vibration pads.
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Catalog 602-2
5. IBC Certification: The chiller shall be certified to the following codes and standards; 2009 IBC, 2010
CBC, ICC-ES AC-156, ASCE 7-05. The chiller must be mounted to a rigid base and may use neoprene
waffle vibration pads.
PART 3 - EXECUTION
3.1 INSTALLATION
A. Installing contractor to:
1. Install per manufacturer's requirements, shop drawings, and contract documents.
2. Adjust chiller alignment on foundations, or subbases as called for on drawings.
3. Arrange piping to allow for dismantling to permit head removal and tube cleaning.
4. Coordinate electrical installation with electrical contractor.
5. Coordinate controls with control contractor.
6. Provide all material required for a fully operational and functional chiller.
7
Install unit in a dry indoor location consistent with NEMA 1 design.
3.2 START-UP
A. Factory Start-Up Services: Provide for as long a time as is necessary to ensure proper operation of the unit,
but in no case for less than two full working days. During the period of start-up, the start-up technician
shall instruct the owner's representative in proper care and operation of the unit.
Catalog 602-2
61
This document contains the most current product information as of this printing. For the most up-to-date
product information, please go to www.daikinmcquay.com.
All Daikin McQuay equipment is sold pursuant to McQuay International’s Standard Terms and Conditions
of Sale and Limited Product Warranty. Consult your local Daikin McQuay Representative for warranty
details. Refer to form 933-430285Y-00-A. To find your local representative, go to www.daikinmcquay.com
© 2012 McQuay International  (800)432-1342  www.mcquay.com
Catalog 602-2 (2/12)