Page 1
Catalog 602-8
Magnitude
®
Magnetic Bearing Centrifugal Chillers
Model WMC, C Vintage
125 to 400 Tons (440 to 1400 kW)
HFC-134a Refrigerant
60/50 Hz
Page 2
Introduction..................................3
Technology That Just Makes Sense .............3
Features and Benets Summary ................3
Features and Benets .........................4
The Compressor Technology ...................4
Integrated Variable Frequency Drive .............5
The Control Technology .......................5
Certications and Standards....................6
Factory Testing ..............................7
Dimensions and Weights.......................8
Unit Dimensions and Shipping Weight ............8
Drawing Notes ..............................9
Options and Accessories .....................10
Unit Options ...............................10
Vessel Options .............................10
Controls Options ............................10
Electrical Options ...........................11
Special Order Options........................11
Table of ConTenTs
Table of ConTenTs
Refrigeration Diagram ........................12
Application Considerations....................13
Location Requirements.......................13
Vibration Mounting ..........................13
System Design .............................13
Optimizing Efciency . . . . . . . . . . . . . . . . . . . . . . . . 13
Evaporator ................................14
Condenser ................................14
Retrot Knockdown .........................16
Engineering Guide Specications ..............18
Manufactured in an ISO 9001 & ISO 14001 certied facility
©2015 Daikin Applied. Illustrations and data cover the Daikin Applied product at the time of publication and we reserve the right to
make changes in design and construction at any time without notice.
CAT 602-8 • MAGNITUDE® MODEL WMC CHILLERS 2 www.DaikinApplied.com
Page 3
InTroduCTIon
InTroduCTIon
WMC 100 - 400 Tons
Magnitude® Magnetic Bearing Chillers
Model WMC 145-400D
WME 400 - 1500 Tons
Model WME 500-700S
100 300 500 700 900 1100 15001300
Technology That Just Makes Sense
The industry’s next generation of centrifugal chillers is here
today with Daikin Magnitude® chillers. The new technology
begins with centrifugal compressors utilizing magnetic
bearings for oil-free operation, integral variable-frequency
drives, and direct drive technology. The high efciency
compressor is matched with highly efcient heat exchanges
to make an impressive chiller. Magnitude® chillers have many
important features:
• State-of-the-art magnetic bearing compressor
with oil-free technology
• Unit-mounted Variable Frequency Drive
• Positive pressure design
• Hermetic, permanent magnet, direct-drive motor
• User-friendly MicroTech® controls
• Open Choices™ feature for BAS of your choice
• HFC-134a refrigerant
(Zero ozone depletion and no refrigerant phase out)
• AHRI cer tication
Features and Benets Summary
The Compressor Technology
• Magnetic bearing system that results in greater efciency
and reliability, more sustainable performance, reduced
operating and maintenance costs, and low vibration and
sound levels compared to traditional oil centrifugals.
Integrated Variable Frequency Drive (VFD)
• Unit-mounted VFD modulates compressor speed to
obtain optimum efciency at all load and lift conditions.
The Control Technology
• Onboard digital electronics provide smart controls and
include a regenerative power system, user-friendly
operator interface, RapidRestore® option, and Open
Choices™ BAS exibility.
Certications and Standards
• Meets ASHR AE Std. 90.1, AHRI 550/590 and IBC/
OSHPD Seismic, and contributes to LEED® credits.
Factory Testing
• Ensures trouble free startup and reliable operation.
Model WME 1000-1500D
www.DaikinApplied.com 3 CAT 602-8 • MAGNITUDE® MODEL WMC CHILLERS
Page 4
The Compressor Technology
Model WMC’s exceptional efciency and reliability is due
to its cutting-edge permanent magnet motor and magnetic
bearing compressor technology. A digitally-controlled
magnetic bearing system replaces conventional oil lubricated
bearings and a direct drive motor eliminates the need for a
lubricated gear box. The compressor shaft, shown in Figure
Figure 1: Magnetic Bearing Compressor
2
1
3
feaTures and benefITs
1, levitates on a magnetic cushion and is the compressor’s
only major moving component. Sensors at each magnetic
bearing provide real-time feedback to the bearing control
system. As a result of this sophisticated design, model WMC
has many advantages over chillers with traditional centrifugal
compressors.
1. Magnetic Bearings and Bearing Sensors
3
1
2. Permanent Magnet Synchronous Motor
3. Backup Bearings
4. Shaft and Impellers
5
5. Compressor Cooling
feaTures and benefITs
4
Oil-Free Compressor Design Benets
No Oil Management System = Greater Reliability
With magnetic bearings operating in a magnetic eld
instead of oil-lubricated bearings, the oil handling
equipment is removed. No need for:
oil pumps
oil reservoirs
oil coolers
oil lters
water regulating valves
oil relief valves
oil storage and disposal
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
signicantly increases unit and system reliability.
Totally Oil-Free Operation = Greater Efciency
The use of oil-free magnetic bearing technology
signicantly increases chiller efciency by reducing
frictional losses within the bearing system.
In addition, efciency improvements can be realized since
there is no oil to coat the heat transfer surfaces.
No Oil Loss = Sustainable Performance
With no possibility of oil loss at light loads or due to
worn seals, the original energy saving efciency can be
maintained for the life of the chiller.
No Oil System = Low Vibration & Sound Levels
With the use of magnetic bearings, the compressor
vibration levels are extremely low, minimizing vibration that
could be transmitted to the structure.
With low vibration levels, sound levels are lower compared
to traditional centrifugal chillers.
No Oil System = Reduced Maintenance Costs
With oil removed from the system, oil samples, oil changes,
oil system maintenance, oil lter changes, and leaks are
eliminated.
CAT 602-8 • MAGNITUDE® MODEL WMC CHILLERS 4 www.DaikinApplied.com
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feaTures and benefITs
Additional Compressor Design Benets
Model WMC’s magnetic bearing compressor design offers
many benets not only because of its oil free design but also
because of its use of a positive pressure refrigerant and a
variable frequency drive.
Environmentally Friendly
Over time negative pressure chillers (such as those using
HCFC-123) may draw air and moisture into the system, which
can signicantly increase energy consumption. Since the
Magnitude
(HFC-134a), the industry-leading efciency can be maintained
for the life of the chiller. In addition, HFC-134a has no ozone
depletion potential and no phase-out schedule per the
Montreal protocol unlike HCFC type refrigerants used in low
pressure designs.
Low Operating Costs
Model WMC offers world class part load efciency due to its
advanced permanent magnet motor and magnetic bearing
VFD compressor design. This allows for signicant energy
savings at off-design conditions compared to xed speed
chillers. See AHRI Certication on page 3 for more
information on part load performance.
®
WMC chiller uses a positive pressure refrigerant
Integrated Variable Frequency Drive
A Variable Frequency Drive (VFD) modulates compressor
speed in response to load and evaporator/condenser
pressure. When minimum speed is reached, moveable inlet
guide vanes redirect the gas ow into the impeller. VFD’s have
the following benets:
• Reduced annual energy costs when there are long
periods of part load operation and/or low compressor lift
(lower condenser water temperature)
• Reduced motor starting inrush current
• Reduced size of backup generators used to provide
emergency power to chillers used on mission critical
applications
• Increased power factor to reduce utility surcharges
WMC Reduced Harmonic Option
The Institute of Electrical and Electronics Engineers (IEEE)
has developed a standard (IEEE519) that denes acceptable
limits of site specic system current and voltage distortion.
The designer may wish to consult this standard to ensure
acceptable levels of harmonic distortion are maintained.
The standard VFD includes 5% line reactors, which
dramatically reduce the harmonic distortion. An optional unit-
mounted harmonic lter is available for all models to meet
lower harmonic level requirements.
The Control Technology
It is only tting that this revolutionary chiller design be
matched with the advanced control technology to give
you the ultimate chiller performance. Our control design
includes many unique energy-saving features and interface
enhancements.
MicroTech® II Controller
The model WMC chiller utilizes MicroTech® II digital control
electronics to proactively manage unit operation and provide
control of external chilled water and cooling tower pumps.
The compressor runs at the minimum speed necessary to
maintain cooling capacity and lift (which decreases with lower
condenser water temperatures), thus minimizing energy usage
over the entire range of operating conditions. By constantly
monitoring chiller status and real time data, the MicroTech
controller will automatically take proactive measures to relieve
abnormal conditions or shut the unit down if a fault occurs.
Additional smart features that optimize operating efciency
have been incorporated into our MicroTech
• Cooling tower control including on/off, staging, and VFD
• Direct control of water pumps
• Chilled water rest
• Demand limit control
• Ability to stage up to four WMC chillers
®
II controls:
Operator Interface
Operation simplicity was one of the main considerations in the
development of the MicroTech
interface is a 15-inch, color touch-screen monitor that is
mounted on an adjustable arm. Key operating parameters and
setpoints are easily accessible. For added convenience, the
unit Operating and Maintenance Manual is also viewable on
the touch-screen panel.
In order to track chiller performance, the MicroTech
controller can record and plot water temperatures, refrigerant
pressures, and motor load. These values can be downloaded
through a convenient USB port in the interface and exported
into a spreadsheet for further evaluation and record purposes.
The trend history screen is shown in Figure 2.
®
II control system. The operator
®
II
®
II
www.DaikinApplied.com 5 CAT 602-8 • MAGNITUDE® MODEL WMC CHILLERS
Page 6
0
10
20
30
40
50
1007550
25
1 P ercent
42 Percent
45 Percent
12 Percent
Percent Ton-Hour Weighting
Percent Load
feaTures and benefITs
Figure 2: Operator Interface Trend History Screen
The controller memory (no batteries required) also retains
the fault history for troubleshooting and monitoring unit
performance. A time/date stamp is associated with each fault.
The fault history can be downloaded through the USB port.
RapidRestore
®
Mission critical facilities such as data centers and hospitals
are demanding stringent capabilities for chillers to restart and
reach full load operation quickly in the event of a power loss.
With the capability of RapidRestore
®
, Magnitude® model WMC
chillers are engineered to meet those needs. See Table 1 for
specications.
Open Choices™ BAS Flexibility
The exclusive Open Choices™ feature provides seamless
integration and comprehensive monitoring, control, and twoway data exchange using industry standard protocols such as
LonTalk
®
, BACnet® or Modbus®. Open Choices™ offers simple
and inexpensive exibility to use the Building Automation
System (BAS) of your choice without an expensive gateway
panel. Open Choices
™
benets include:
• Easy to integrate into your BAS of choice
• Factory- or eld-installed communications module
• Integrated control logic for factory options
• Easy-to-use local user interface
• Comprehensive data exchange
Certications and Standards
As with many other Daikin Applied chiller products, the
Magnitude
and standards.
AHRI Certication
Part load performance can be presented in terms of Integrated
Part Load Value (IPLV), which is dened by AHRI Standard
550/590. Based on AHRI Standard 550/590, and as shown
in Figure 3, a typical chiller can operate up to 99% of the time
at off-peak conditions and usually spends most of this time at
less than 60% of design capacity.
Figure 3: IPLV Dened by AHRI Standard 550/590
®
model WMC meets all necessary certications
RapidRestore® – Quickly restores cooling capacity
when power is restored after a power failure
• Compressor Start – Amount of time required for
the chiller to restart
• Fast Loading – Amount of time required for the
chiller to reach a certain load condition
®
Table 1: WMC RapidRestore
Times- After Power
Restoration
Compressor Start Fast Loading to 80% Load
43 sec 120 sec*
* Estimated load time. Ti mes may var y depen ding on operating c onditions.
WMC chillers are rated and certied to AHRI Standard
550/590. The ability of the WMC chillers to achieve very high
part load efciencies, as evidenced by their world-class IPLV
ratings, is due primarily to the use of a variable frequency
drive and the low friction of the magnetic bearing system. For
more information on variable frequency drives, see Integrated
Variable Frequency Drive on page 2.
CAT 602-8 • MAGNITUDE® MODEL WMC CHILLERS 6 www.DaikinApplied.com
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feaTures and benefITs
Compliance with ASHRAE Std. 90.1
ASHRAE Standard 90.1 was developed to assist owners
and designers make informed choices on a building’s
design, systems, and equipment selection. Model WMC
can signicantly exceed ASHRAE 90.1 minimum efciency
requirements.
IBC/OSHPD Seismic Certication
Daikin Magnitude® WMC chillers have been tested and
certied by an independent agency, experts in seismic
analysis and design to meet IBC seismic and OSHPD preapproval. Find more information about seismic requirements
and HVAC systems at www.DaikinApplied.com.
®
LEED
For building owners who wish to pursue Leadership in
Energy and Environmental Design (LEED
Certication, the performance of the WMC may contribute
points towards Energy and Atmosphere (EA) Credits 1 and 4.
Points earned for EA Credit 1 are awarded based on overall
building efciency. The high efciency of the WMC will
contribute to the total points earned for this credit.
EA Credit 4 qualication is partially determined by tonnage
and refrigerant quantity. Vessel stack and tube count
selections will affect the quantity of refrigerant in the chiller.
Consult with your Daikin Applied sales representative for more
information.
®
) Green Building
Demand Distortion of a facility. It projects whether the facility
complies with the TDD recommendations of IEEE 519-2014
and allows AC line reactors and/or harmonic lters to be
added to the system to model their impact. Daikin can also
provide custom harmonic distortion estimations when design
data of the system is provided.
Factory Testing
All Daikin Applied centrifugal chillers (50 or 60 hertz) are
factory-tested prior to shipment. Operating and safety controls
are checked for correct settings and operation. This testing
helps reduce eld start-up issues and maintain critical
construction schedules.
The IEEE 519-2014 Standard
The Institute of Electrical and Electronics Engineers (IEEE)
has developed a standard that recommends distortion limits
for both power utilities and their customers. The purpose
of these limits is to ensure that the voltage distortion of the
utility’s public power grid is maintained at an acceptable level.
To accomplish this, IEEE 5192014 presents recommended
harmonic current distortion limits for utility customers. These
limits are based on the peak demand of the customer. This
is called the Total Demand Distortion (TDD). This standard
provides a sliding scale for the recommended TDD limit for
each utility customer. The greater the demand that a customer
places on the utility, the more stringent the recommended
TDD limits.
IEEE 519-2014 clearly states that the TDD is to be measured
at the point where a utility customer connects to the public
utility. It does not apply to any points inside the customer’s
facility; it only applies to the point where another utility
customer could connect to the public power grid. If the
utility’s customers comply with the TDD limits stated in IEEE
519-2014, it is then the utility’s responsibility to provide
voltage to its customers that meets the harmonic voltage
recommendations of this standard.
Harmonic Distortion Analysis
An electronic calculation worksheet is available from Daikin
that is intended to be used as a tool for estimating the Total
www.DaikinApplied.com 7 CAT 602-8 • MAGNITUDE® MODEL WMC CHILLERS
Page 8
dImensIons and WeIghTs
dImensIons and WeIghTs
Unit Dimensions and Shipping Weight
Figure 4: WMC 125S, 145S and 200S (2-pass, right-hand conguration, with grooved connections)
L W
H
Figure 5: WMC 145D, 150D, 225D, 250D, 275D, 290D, 350D and 400D (2-pass, right-hand conguration, with grooved connections)
L
W
H
Table 2: WMC125-400 Dimensions and Shipping Weights
Model Heat Exchanger
Length
in (mm)
Width *
in (mm)
Height
in (mm)
Shipping Weight **
WMC125S E2209 / C2009 134.3 (3411) 43.5 (1105) 81.0 (2057) 5086 (2307)
WMC145S E2209 / C2009 134.3 (3411) 43.5 (1105) 81.0 (2057) 5586 (2534)
WMC145D E2209 / C2009 134.3 (3411) 43.5 (1105) 80.8 (2052) 6760 (3066)
WMC150D E2212 / C2012 169.2 (4298) 43.5 (1105) 80.8 (2052) 7709 (3497)
WMC200S E2609 / C2209 134.2 (3409) 47.2 (1199) 82.9 (2106) 6705 (3041)
WMC225D E2609 / C2209 134.2 (3409) 47.2 (1199) 83.8 (2129) 7250 (3289)
WMC250D E2609 / C2209 134.2 (3409) 47.2 (1199) 83.8 (2129) 7850 (3561)
WMC275D E2612 / C2212 169.1 (4295) 47.2 (1199) 83.9 (2131) 8221 (3729)
WMC290D E2612 / C2212 169.1 (4295) 47.2 (1199) 83.9 (2131) 9321 (4228)
WMC350D E3009 / C2609 139.6 (3545) 55.2 (1402) 94.2 (2395) 11147 (5056)
WMC400D E3012 / C2612 168.5 (4280) 55.2 (1402) 94.3 (2395) 11574 (5250)
* Width is based on un it witho ut optional harm onic lte rs.
** Shippi ng weight i s based on unit with st andard t ube congurati on.
lb (kg)
CAT 602-8 • MAGNITUDE® MODEL WMC CHILLERS 8 www.DaikinApplied.com
Page 9
Drawing Notes
1. Final connections must allow for 0.5-inch +/- (12.7 mm)
manufacturing tolerances.
2. 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.
3. 0.375-inch (9 mm) suction nozzle relief valve must be
piped per ANSI / ASHRAE 15.
4. Minimum Clearances (See Figure 6):
• Check local codes for any additional clearance
requirements.
• Installation layout should be designed by qualied
personnel familiar with local codes.
5. 3.25-inch (83 mm) diameter lifting holes are provided.
See installation manual (available at www.DaikinApplied.
com) for lifting instructions.
6. All water connections are given in standard U.S. nominal
pipe sizes. Standard connections are suitable for
welding or grooved couplings.
7. Unit shown has standard right-hand water connections.
Left-hand connections are available for either vessel.
For right hand evaporator the inlet and outlet nozzles
are reversed. ANSI-anged nozzle connections are
available upon request. When using ANSI-anged
connections add 0.5 inch (13 mm) to each anged end.
dImensIons and WeIghTs
8. Dimensions shown are for units (evaporator / condenser)
with standard design pressures. The waterside design
pressure is 150 psi (1034 kPa). Consult the factory for
unit dimensions with higher design pressures.
9. Unit vibration isolator pads are provided for eld
installation and when fully loaded are 0.25 inches
(6 mm) thick.
10. The shipping skid adds 4.00 inches (105 mm) to the
overall unit height.
11. If main power wiring is brought up through the oor, this
wiring must be outside the envelope of the unit.
12. The unit is shipped with a full operating charge of
refrigerant except with the Type B knockdown option.
13. Optional marine waterboxes are available upon request.
Figure 6: Minimum Clearances Based on Standard Waterboxes
WMC TOP VIEW
Minimum 10’ Clearance on one end for tube service
Minimum 3’ Clearance
(Models WMC125S, 145S, 145D, 200S, 225D, 250D)
Minimum 13’ Clearance on one end for tube service
(Models WMC150D, 275D, 290D, 350D, 400D)
Minimum 3’ Clearance
Minimum 4’ Clearance
in front of control boxes and electrical panels
NOTE: Hinged type waterboxes may require more clearance. Consult your Daikin Applied sales representative for details.
www.DaikinApplied.com 9 CAT 602-8 • MAGNITUDE® MODEL WMC CHILLERS
Page 10
opTIons and aCCessorIes
opTIons and aCCessorIes
Unit Options
Export Packaging
A wooden skid that aids in moving the unit and tight tting
plastic covering the entire unit to protect it from dirt and grime
during transit and storage are standard. Open and closed
crating is also offered as an option.
Pumpout Unit
Pumpout units are available in a variety of sizes with singlephase or three-phase power and with or without storage tanks.
Contact your Daikin Applied sales ofce for details.
Extended Warranties
Extended 1, 2, 3, or 4 year warranties for par ts only or for
parts and labor are available for the compressor/motor only,
the entire unit, or the entire unit including refrigerant.
Witness Performance Test
The specied full and/or part load tests, as ordered, are
performed in the presence of the customer under the
supervision of a factory engineer and include compilation of
the test data onto an easy-to-read spreadsheet.
Non-Witness Test
The specied full and/or part load tests, as ordered, are
performed under the supervision of a factory engineer; data is
compiled, certied, and transmitted to the customer.
Refrigerant Charge
Unit ships with a full holding charge of HFC-134a as standard.
An inert gas holding charge is available as an option.
Epoxy and Ceramic Coating
Evaporator and condenser heads and marine waterboxes can
be coated for corrosion protection with either epoxy or ceramic
coatings. Tube sheets may also be ceramic coated.
Single Insulation - Evaporator Shell / Suction Piping
0.75-inch thermal insulation on cold surfaces — excluding
heads and waterboxes — is available..
Single Insulation - Evaporator Heads and
Waterboxes
0.75-inch thermal insulation is available.
Double Insulation - Evaporator Shell / Suction
Piping
1.5-inch thermal insulation on cold surfaces — excluding
heads and waterboxes — is available.
Double Insulation - Evaporator Heads and
Waterboxes
1.5-inch thermal insulation is available.
Hinged Waterbox Covers and Heads
Hinges for marine waterbox covers or heads (compact
waterboxes) are available to aid in heat exchanger
maintenance.
Tube Size, Wall Thickness and Material
A wide range of tube options are available to accommodate
most ow rates and uids. Standard wall thickness is 0.025-
inch. Wall thicknesses of 0.028-inch or 0.035-inch are
optional.
Knockdown Shipment
Several options for a knockdown shipment to facilitate unit
placement are available. See Retrot Knockdown on page
13 for details.
Vessel Options
Marine Waterboxes
Marine waterboxes that allow the end plate of the waterbox to
be removed without disconnecting the water piping from the
chiller are optional.
Flange Water Connections
A standard unit will have grooved water connections. ANSI
raised face anges on either the evaporator or condenser are
optional. Mating anges must be provided by the eld.
300 psi Water Side Vessel Construction
150 psi water side vessels are standard. 300 psi water side
vessels are optional
Controls Options
BAS Interface Module
Factory-installed on the unit controller for the applicable
protocol being used (Can also be retrot):
• BACnet® MS/TP
• BACnet® IP
• BACnet® Ethernet
• LonWorks
• Modbus® RTU
®
CAT 602-8 • MAGNITUDE® MODEL WMC CHILLERS 10 www.DaikinApplied.com
Page 11
opTIons and aCCessorIes
Electrical Options
Power Panel High Short Circuit Current Rating
65 kA panel rating (Standard is 35 kA).
Electro Magnetic Interference (EMI) and Radio
Frequency Interference (RFI) Filter
A lter for EMI and RFI is a factory-installed option.
Ground Fault Protection
Protects equipment from arcing ground fault damage from
line-to-ground fault currents less than those required for
conductor protection.
Input Power Meter
Allows display of input phase amps, volts, power factor, and
power on the operator interface screen.
RapidRestore
Allow chillers to restart and reach full load operation quickly in
the event of a power loss event. See RapidRestore
3 for more details.
®
®
on page
Special Order Options
The following special order options are available; requiring
factory pricing, additional engineering, and possible dimension
changes or extended delivery:
1. Non-standard location of nozzle connections on heads
(compact waterboxes) or marine waterboxes
2. Clad tube sheets
3. Sacricial anodes in heads (compact waterboxes) or
marine waterboxes
4. Spacer rings on heads to accommodate automatic tube
brush cleaning systems (installed by others)
5. Remote-mounted refrigerant monitor, including
accessories such as 4-20ma signal, strobe light, audible
horn, and air pick-up lter
www.DaikinApplied.com 11 CAT 602-8 • MAGNITUDE® MODEL WMC CHILLERS
Page 12
Figure 7: Refrigeration System Diagram
332632901 0A
FLOW DIAGRAM, WMC
IN
OUT
S
S
TE
TI
TE
TI
CF
CFS
FE
FI
HV
28
3
21
22
20
HV
23
HV
29
US03
US04
HV
31
6
5
HV
HV
16
13
11
US10
US04
US03
US02
UNIT
CONTROL
BOX
COMPRESSOR COOLING
CF
EF
CONDENSER
18
FG
19
17
24
25
IN
OUT
TE
TI
TE
TI
EF
EFS
FE
FI
HV
4
HV
9
US02
US10
EVAPORATOR
2
1
7
8
14
30
COMP
COMP
HV
34
HV
15
COMPRESSOR COOLING
DISCHARGE
MAIN LIQUID
DISCHARGE
10
US05
TI
TE
US05
SUCTION
SUCTION
STAGING
STAGING
26
HV
12
32
33
27
35
3637
BUTTERFLY
VALVE
CHECK VALVE
(SPRING)
BALL VALVE
ELECTRONIC
EXPANSION
VALVE
FLOW CHART LEGEND
FILTER DRYER
S
CENTRIFUGAL
COMPRESSOR
THREE-WAY
VALVE
SPRING LOADED
RELIEF VALVE
SIGHT GLASS
FLOW SWITCH
INSULATED
TEMPERATURE
SENSOR
SERVICE VALVE
FG
FE
FI
TE
TI
VENT / DRAIN
RELIEF VALVE
38
39
BMCC
TT
PT
TT
PT
PT
TT
TEMPERATURE/PRESSURE TRANSDUCER
(INTERNAL TO COMPRESSER)
BMCC
BEARING MOTOR COMPRESSOR CONTROLER
(INTERNAL TO COMPRSSOR)
BMCC
TT
PT
TT
PT
VALVE
CONTROL
LABEL
refrIgeraTIon dIagram
refrIgeraTIon dIagram
1 PRESSURE TAP N/A
NO.
BUBBLE
2 RELIEF VALVE MANUAL
3 RELIEF VALVE AUTOMATIC
4 SERVICE VALVE MANUAL
5 BUTTERFLY VALVE MANUAL
6 BUTTERFLY VALVE MANUAL
7 PRESSURE TAP N/A
8 RELIEF VALVE MANUAL
9 SERVICE VALVE MANUAL
10 STAGING VALVE AUTOMATIC
11 STAGING VALVE AUTOMATIC
12 BALL VALVE MANUAL
13 EXPANSION VALVE AUTOMATIC
14 BALL VALVE MANUAL
15 BALL VALVE MANUAL
16 FILTER DRYER N/A
17 RELIEF VALVE MANUAL
18 SIGHT GLASS N/A
19 PRESSURE TAP N/A
20 RELIEF VALVE AUTOMATIC
US05 LIQUID LINE TEMPERATURE
CS10 EVAPORATOR LEAVING WATER TEMPERATURE
FLOW SWITCH
EF EVAPORATOR FLOW SWITCH
CF CONDENSER FLOW SWITCH
CFS CONDENSER FLOW SIGNAL TO CHILLER CONTROL
BUBBLE NO. DESCRIPTION
EFS EVAPORATOR FLOW SIGNAL TO CHILLER CONTROL
21 3-WAY VALVE AUTOMATIC
22 RELIEF VALVE AUTOMATIC
23 SERVICE VALVE MANUAL
24 PRESSURE TAP N/A
25 RELIEF VALVE MANUAL
26 FILTER DRYER N/A
27 BALL VALVE MANUAL
28 BALL VALVE MANUAL
29 SERVICE VALVE MANUAL
30 CHECK VALVE AUTOMATIC
31 CHECK VALVE AUTOMATIC
32 PRESSURE TAP N/A
33 PRESSURE TAP N/A
34 PRESSURE TAP N/A
35 PRESSURE TAP N/A
36 RELIEF VALVE AUTOMATIC
37 RELIEF VALVE AUTOMATIC
38 PRESSURE TAP N/A
UNIT CONTROLLER
39 PRESSURE TAP N/A
US02 EVAPORATOR ENTERING WATER TEMPERATURE
US03 CONDENSER ENTERING WATER TEMPERATURE
US04 CONDENSER LEAVING WATER TEMPERATURE
BUBBLE NO. DESCRIPTION
CAT 602-8 • MAGNITUDE® MODEL WMC CHILLERS 12 www.DaikinApplied.com
Page 13
applICaTIon ConsIderaTIons
applICaTIon ConsIderaTIons
Location Requirements
Daikin WMC units are designed only for indoor, weatherprotected, non-freezing areas 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 104°F (4.4°C to 40°C).
Vibration Mounting
The Magnitude® WMC chiller is almost vibration-free.
Consequently, oor mounted spring isolators are not usually
required. Neoprene mounting pads are shipped with each
unit. It is recommended to continue to use exible piping
connectors to reduce sound transmitted into the pipe and to
allow for expansion and contraction.
System Design
Water Piping
Field installed water piping to the chiller must include:
• air vents at the high points.
• a cleanable 20-mesh water strainer in water inlet lines.
• a ow proving device for both the evaporator and
condenser to prevent freeze up. Flow switches, thermal
dispersion switches, or Delta-P switches can be used.
Note that ow switches are factory installed. Additional
ow switches can be used only if they are connected in
series with the ones already provided.
• sufcient shutoff valves to allow vessel isolation. The
chiller must be capable of draining the water from the
evaporator or condenser without draining the complete
system.
It is recommended that eld installed water piping to the chiller
include:
• thermometers at the inlet and outlet connections of both
vessels.
• water pressure gauge connection taps and gauges
at the inlet and outlet connections of both vessels for
measuring water pressure drop.
Piping must be supported to eliminate weight and strain on
the ttings and connections. Chilled water piping must be
adequately insulated.
NOTE: This product, in its standard conguration, is
equipped with a shell and tube evaporator with
carbon steel shell and copper tubes. The water or
other uid used in contact with the wetted surfaces of
the heat exchangers must be clean and non-corrosive
to the standard materials of construction. Daikin
Applied makes no warranty as to the compatibility
of uids and materials. Non-compatible uids may
void the equipment warranty. If the compatibility of
the uid with the standard materials of construction
is in question, a professional corrosion consultant
should administer the proper testing and evaluate
compatibility.
Variable Fluid Flow Rates and Tube Velocities
Many chiller system control and energy optimization
strategies require signicant changes in evaporator water
ow rates. The Magnitude
full advantage of these energy saving opportunities using
different combinations of shell sizes, number of tubes, and
pass arrangements.
Both excessively high and excessively low uid ow rates
should be avoided. Excessively high uid ow rates and
correspondingly high tube velocities will result in high uid
pressure drops, high pumping power, and potentially tube
erosion or corrosion damage. Excessively low uid ow rates
and correspondingly low velocities should also be avoided as
they will result in poor heat transfer, high compressor power,
sedimentation and tube fouling.
®
chiller line is well suited to take
Water Volume
All chilled water systems need adequate time to recognize a
load change to avoid short cycling of the compressors or loss
of control. 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 during the low load period and the
desired cycle time for the compressors.
Assuming that there are no sudden load changes and that
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 ow rate” is often used.
A properly designed storage tank should be added if the
system components do not provide sufcient water volume.
Optimizing Efciency
A key to improving energy efciency 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 optimum plant design must take into account all of the
interactions between chiller, pumps, and tower. The Daikin
Energy Analyzer
the entire system efciency, quickly and accurately. It is
especially good at comparing different system types and
operating parameters. Contact your local Daikin Applied sales
ofce for assistance on your particular application.
™
II program is an excellent tool to investigate
www.DaikinApplied.com 13 CAT 602-8 • MAGNITUDE® MODEL WMC CHILLERS
Page 14
applICaTIon ConsIderaTIons
Evaporator
Reducing Evaporator Fluid Flow
Several popular chiller plant control practices — including
Variable Primary Flow systems — advocate reducing the
evaporator uid ow rate as the chiller capacity is reduced.
This practice can signicantly reduce the evaporator pumping
power while having little effect on chiller energy consumption.
The Magnitude
tube, and pass combinations, are ideal for application in
variable evaporator ow systems as long as the minimum and
maximum tube velocities are taken into consideration when
selecting the chiller.
If it is decided to vary the evaporator water ow rate, the rate
of change should not exceed 10% per minute and should not
exceed the minimum or maximum velocity limits.
®
WMC chillers, with their wide range of shell,
Evaporator Entering Water Temperature
The maximum temperature of water entering the chiller
on standby must not exceed 115°F (46.1°C). Maximum
temperature entering on start-up must not exceed 90°F
(32°C).
Evaporator Leaving Water Temperature
Warmer leaving chilled water temperatures will raise the
compressor’s suction pressure and decrease the lift,
improving efciency. Using 45°F (7°C) leaving water instead of
the typical 42°F (5.5°C) will signicantly reduce chiller energy
consumption.
Evaporator Water Temperature Difference
The industry standard has been a 10°F (5.5°C) temperature
drop in the evaporator. Increasing the drop to 12°F or 14°F
(6.6°C or 7.7°C) can improve chiller efciency and reduce
pump energy consumption.
Condenser
Reducing Condenser Fluid Flow
Several popular chiller plant control practices also advocate
reducing the condenser uid ow rate as the chiller load is
reduced. This practice can signicantly reduce the condenser
pumping power, but it may also have the unintended
consequence of signicantly increasing compressor power
since the leaving condenser water temperature is directly
related to compressor lift and power. The higher compressor
power will typically be larger than the condenser pumping
power reduction and will result in a net increase in chiller plant
energy consumption. Therefore, before this strategy is applied
for energy saving purposes it should be extensively modeled
or used in an adaptive chiller plant control system which will
take into account all of the interdependent variables affecting
chiller plant energy. If it is decided to use variable condenser
uid ow, the model WMC chiller can operate effectively as
long as the minimum and maximum tube velocities are taken
into consideration when selecting the chiller.
Reducing Condenser Entering Water Temperature
As a general rule, a 1°F (0.5°C) drop in condenser entering
water temperature will reduce chiller 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.
When the ambient wet bulb temperature is lower than design,
the entering condenser water temperature of Magnitude
WMC chillers can be lowered to improve chiller per formance.
Chillers can start with entering condenser water temperatures
as low as 40°F (4.4°C). For short periods of time during
startup, the entering condenser water temperature can even
be lower than the leaving chilled water temperature.
Depending on local climatic conditions, using the lowest
possible entering condenser water temperature may be more
costly in total system power consumed than the expected
savings in chiller power would suggest, due to the excessive
fan power required.
In this scenario, cooling tower fans would continue to operate
at 100% capacity at low wet bulb temperatures. The trade-
off between better chiller efciency and fan power should
be analyzed for best overall system efciency. The Energy
Analyzer
sales representative) can optimize the chiller/tower operation
for specic buildings in specic locales.
™
II program (available from your Daikin Applied
®
Condenser Water Temperature Difference
The industry standard of 3 gpm/ton or about a 9.5°F (5.3°C)
delta-T works well for most applications.
Condenser Water Temperature Control
Condenser water control is an important consideration in
chiller plant design since condenser water temperature will
directly impact chiller operation and efciency. When the
ambient wet bulb temperature is lower than peak design,
the entering condenser water temperature from the cooling
tower can be allowed to fall, improving chiller performance.
However, operational issues may occur when the condenser
water temperatures are either too high or too low. The WMC
chiller provides several options to assist the chiller plant
designer in providing the optimum control of condenser water
temperature.
Cooling Tower Control
Control of the cooling tower is required to maintain stability
and avoid operational issues. This can be achieved through
a BAS or by using the MicroTech
utilizing a common condenser water loop for multiple
purposes, the BAS contractor must provide the control but use
of the MicroTech
®
II output signal is still recommended.
®
II controller. For systems
CAT 602-8 • MAGNITUDE® MODEL WMC CHILLERS 14 www.DaikinApplied.com
Page 15
applICaTIon ConsIderaTIons
The preferred cooling tower control utilizes a variable speed
fan. MicroTech
®
II will provide a control signal to determine
the proper fan speed. It can also control up to four stages
of fan cycling. Note that fan cycling can cause cooling tower
water temperature to uctuate as fans stage on/off, potentially
adding instability to the system.
Special consideration must be given to starting the chiller
when cold condenser water is present, such as with inverted
starts or changeover from free (tower) cooling to mechanical
cooling. It is required that some method be used to control
the condenser water to maintain proper head pressure as
indicated by the MicroTech
®
II controller.
Acceptable methods include the following (Each of these
options can be controlled by the MicroTech
a BAS utilizing the MicroTech
®
II output signals.):
®
II or through
1. Three-Way Bypass Valve Operation
A traditional method for building condenser pressure at
startup with colder condenser water is with the use of
a three-way bypass valve. The device blends warmer
water leaving the condenser with cooler water from the
cooling tower at the condenser inlet. The bypass valve
position will change until full ow from the tower to the
condenser is obtained. The MicroTech
®
II provides only
the valve position control signal. Main power to drive the
valve’s actuator must be provided by the installer. The
three-way valve should be located close to the chiller
within the equipment room to minimize the volume of
water.
2. Two-Way Valve Operation
Another condenser control method is to use a
modulating two-way control valve located on the outlet
connection of the condenser. The valve will be nearly
closed at startup to restrict water ow, which keeps
generated heat in the condenser until an acceptable
minimum condenser pressure is reached. As heat
builds, the valve will open slowly until a full ow
condition from the cooling tower is established. A
separate power source is required to provide power to
the valve actuator.
3. VFD Operating with a Condenser Water Pump
A third method of condenser control for startup is
utilizing a variable frequency drive with the condenser
water pump. The speed will change as directed by the
MicroTech
®
II output signal until design ow is reached.
Speed adjustments may be required during the initial
chiller startup as determined by the service technician.
NOTE: Not using the MicroTech® II logic to control valves
and variable frequency drives may result in system
instability, capacity reduction, and issues starting the
chiller with cold condenser water temperature.
Condenser Pump Sequencing
It is recommended to utilize the logic built into the MicroTech
®
II controller to start the condenser pump and maintain
condenser head pressure control. MicroTech
®
II has the
capability to operate a primary pump and a secondary standby
pump. The condenser water ow should be stopped when
the chiller shuts off. This will conserve energy and prevent
refrigerant from migrating to the condenser.
Lenient Flow Operation
For chiller startup, the condenser control systems can reduce
the ow to low rates, which can make operation of a ow
sensing device unreliable. The MicroTech
®
II controller has
a “lenient ow” feature that acts as an override of the ow
sensor while protecting the chiller by monitoring a condenser
pressure setting that is below the high pressure cutout.
Water Side Economizer Cycle Operation
Water side economizers are commonly used for ASHRAE
90.1 compliance and energy savings. This system utilizes
a heat exchanger external to the chiller when cold cooling
tower water is available to provide cooling. The most common
system has a heat exchanger used in conjunction with the
chiller’s evaporator.
The BAS contractor will need to provide controls for the heat
exchanger including isolation valves and temperature control.
The BAS contractor will also need to control the isolation
valves for the chiller. It is important to use slow-acting type
valves to prevent rapid changes in system ows. Changeover
from economizer cooling to mechanical cooling requires one
of the methods previously mentioned to maintain suitable
condenser head pressure.
Contact your local Daikin Applied representative for more
information on this application.
www.DaikinApplied.com 15 CAT 602-8 • MAGNITUDE® MODEL WMC CHILLERS
Page 16
DISCHARGE
CONTROL BOX
OITS PANEL BOXED
AND SECURLY
FASTENED TO UNIT
CONTRL BOX
ISOMETRIC
FRONT VIEW
POWER BOX
REAR VIEW
SUCTION
MOTOR COOLING
MAIN LIQUID
DETAIL A
DETAIL B
applICaTIon ConsIderaTIons
Retrot Knockdown
It is estimated that fty percent of retrot applications require partial or complete disassembly of the chiller. Magnitude® WMC
chillers are relatively easy to disassemble due to the small compressor size, simplied refrigerant piping, and the absence of a
lubrication system with its attendant components and piping. Two knockdown arrangements, Type A shown in Figure 8 and Type
B shown in Figure 9, are available as options.
Type A Knockdown, “Bolt-Together Construction”
Chillers are built and shipped completely assembled with bolt-together construction on major components for eld disassembly
and reassembly on the job site.
Figure 8: Type A Knockdown
Type A Scope:
• Chiller components are manufactured with bolt-together
construction designed for eld disassembly and
reassembly on-site.
• Unit ships completely assembled to the jobsite.
• Suction and discharge lines have bolt-on anges.
• Motor cooling line is brazed at mechanical connections
(see Detail B in Figure 8).
• Unit is fully tested at the factory prior to shipment.
• Site disassembly and reassembly must be supervised or
completed by Daikin Applied service personnel.
• Blockoff plates are required to cover any refrigerant
connection left open for extended periods of time.
Contact Daikin Applied service to obtain these parts.
• Ideal for retrot applications where site diassembly is
needed due to installation clearances.
• Unit ships with vessel and/or head insulation, if ordered.
• Unit ships with full factory refrigerant charge in the
chiller.
• Unit ships with replacement refrigerant gaskets and
O-rings, stick-on wire ties, and touch-up paint.
CAT 602-8 • MAGNITUDE® MODEL WMC CHILLERS 16 www.DaikinApplied.com
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applICaTIon ConsIderaTIons
Type B Knockdown, “Partial Disassembly”
Compressor(s), power boxes and control box are removed and shipped on separate skids; combined vessel stack is shipped
together as a sub-assembly.
Figure 9: Type B Knockdown
ISOMETRIC
FRONT VIEW
DETAIL A
DETAIL B
CRATE TO CONTAIN:
DISCHARGE PIPING•
SUCTION ELBOW•
MOTOR COOLING•
LIQUID LINE•
GLUE•
•
LOOSE INSULATION
• MISCELLANEOUS ITEMS
GLUE
DETAIL D
POWER BOX
DETAIL C
COMPRESSOR(S)
COMPRESSOR(S)
SUCTION
BLOCKOFF
OITS PANEL BOX
DISCHARGE
BLOCKOFF
CONTROL BOX
Type B Scope:
• Compressor(s), power box, and control box are removed
(at the factory) and shipped on separate skids; vessel
stack is shipped as a complete sub-assembly.
• All associated piping and wiring remain attached, if
possible.
• Suction and discharge lines have bolt-on anges and, if
possible, remain attached.
• All free piping ends are capped.
• Unit ships with vessel and/or head insulation, if ordered.
• Refrigerant will not be shipped with the chiller and must
be procured by others.
charge.
• Unit ships with replacement refrigerant gaskets and
O-rings, stick-on wire ties, and touch-up paint.
• Unit is fully tested at the factory prior to shipment.
• Site reassembly must be supervised or completed
by Daikin Applied service personnel. Cost for unit
resassembly and supervision by Daikin Applied service
is not included in the purchase price of the equipment.
Contact Daikin Applied service for pricing.
• Ideal for retrot applications where it is desired that the
compressor(s), power box, and control box be removed
at the factory, prior to shipment, and where refrigerant
may be secured by others.
• Compressor(s) and vessels receive an inert gas holding
www.DaikinApplied.com 17 CAT 602-8 • MAGNITUDE® MODEL WMC CHILLERS
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engIneerIng guIde speCIfICaTIons
MAGNITUDE® MAGNETIC BEARING CENTRIFUGAL CHILLERS
engIneerIng guIde speCIfICaTIons
PART 1 - GENERAL
1.1 S U M M ARY
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 eld 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 eld
interface and eld connection. Diagram shall fully
depict eld and factory wiring.
4. Manufacturer’s certied 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 9001 and ISO
14001 Certied.
C. The chiller shall be factory tested at the manufacturer’s
plant prior to shipment on an AHRI approved test stand.
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 A Knockdowns] The unit shall be delivered
to the job site completely assembled and charged with
refrigerant and ready for eld knockdown. Contractor
shall leak test, recover refrigerant, evacuate, and charge
with refrigerant after reassembly.
– OR –
A. [For Type B Knockdowns] The compressor, suction and
discharge piping, VFD power panel and touch screen
shall be removed and shipped separately. All wiring
and piping shall remain attached where possible. The
remaining loose parts shall be packaged in a separate
crate. The unit is to be factory tested and shipped with
an inert gas holding charge, evaporator insulated and a
kit for compressor insulation. Contractor shall leak test,
evacuate and charge with refrigerant after reassembly.
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 rst [OPTION] and also include an
additional extended warranty for one -OR- two- ORthree -OR- four years on the entire unit -OR- on entire
unit including refrigerant coverage -OR- compressor
only.
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 Magnitude® model WMC,
including the standard product features and all special
features required per the plans and specications.
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 conguration
is acceptable or meets the specications. Equipment
proposed “as equal”, must meet the specications
including all architectural, mechanical, electrical, and
structural details, all scheduled performance and the job
design, plans and specications.
2.2 UNIT DESCRIPTION
A. Provide and install as shown on the plans a factory
assembled, charged, and tested water-cooled packaged
CAT 602-8 • MAGNITUDE® MODEL WMC CHILLERS 18 www.DaikinApplied.com
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engIneerIng guIde speCIfICaTIons
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 efciency. On two-compressor units, the
evaporator and condenser refrigerant sides and the
expansion valve shall be common and the chiller shall
be capable of running on one compressor with the
other compressor or any of its auxiliaries inoperable or
removed.
2.3 DESIGN REQUIREMENTS
A. General: Provide a complete water-cooled, semi-
hermetic oil-free centrifugal compressor water chiller as
specied 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 charged
with refrigerant HFC-134a. If manufacturer offers a
chiller using any HCFC refrigerant, manufacturer shall
provide, in writing, documentation signed by an ofcer of
the company assuring refrigerant availability and price
schedule for a 20-year period.
B. 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 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. A complete purge system capable of removing noncondensables and moisture during operation and
shut-down.
2. A 20-year purge maintenance agreement
that provides parts, labor, and all preventative
maintenance required by the manufacturer’s
operating and maintenance instructions.
3. 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 identies water, acid,
or other contaminant levels higher than specied by
the manufacturer, the oil and/or refrigerant must be
replaced or returned to the manufacturer’s original
specication at no cost to the owner.
4. 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.
C. Performance: Refer to chiller performance rating.
D. Acoustics: Sound pressure for the unit shall not exceed
the following specied 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
63 125 250 500 1000 2000 4000 8000
2.4 CHILLER COMPONENTS
A. Compressors:
1. The unit shall utilize magnetic bearing, oil-free, semihermetic centrifugal compressors. The compressor
drive train shall be capable of coming to a controlled,
safe stop in the event of a power failure.
2. The motor shall be of the semi-hermetic type,
of sufcient size to efciently fulll compressor
horsepower requirements. It shall be liquid refrigerant
cooled with internal thermal sensing devices in the
stator windings. The motor shall be designed for
variable frequency drive operation.
a. If the compressor design requires a shaft seal
to contain the refrigerant, the manufacturer shall
supply a 20 year parts and labor warranty on the
shaft seal and a lifetime refrigerant replacement
warranty if a seal failure leads to refrigerant
loss, or the chiller manufacturer shall assume
all costs to supply and install a self contained
air conditioning system in the mechanical space
sized to handle the maximum heat output of 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.
b. If the compressor/motor uses any form of
antifriction bearing (roller, ball, etc), the chiller
manufacturer shall provide the following at no
additional charge:
• A 20-year bearing warranty and all
preventative maintenance as specied by
the manufacturer’s published maintenance
instructions.
• At start up, a three-axis vibration analysis and
written report to establish bearing condition
baseline.
• An annual three-axis vibration analysis and
Overall
dBA
www.DaikinApplied.com 19 CAT 602-8 • MAGNITUDE® MODEL WMC CHILLERS
Page 20
engIneerIng guIde speCIfICaTIons
written report indicating bearing condition.
3. The chiller shall be equipped with a refrigerant cooled
and integrated Variable Frequency Drive (VFD) to
automatically regulate compressor speed in response
to cooling load and the compressor pressure lift
requirement. If a condenser water-cooled VFD is
supplied, the manufacturer shall supply factory
installed dual water lters with a bypass valve and
pressure differential switch factory wired to the chiller
control panel to indicate that a lter has clogged and
requires service. The pressure differential switch
shall also provide a separate dry contact which can
be connected to the BAS system as a means of
notifying operating personnel of the need to service
the lters. If the condenser cooling circuit includes an
intermediate heat exchanger, it must be of the brush
cleanable shell and tube style. Brazed plate heat
exchangers which cannot be eld cleaned are not
acceptable. Movable inlet guide vanes and variable
compressor speed, shall provide unloading. The
chiller controls shall coordinate compressor speed
and guide vane position to optimize chiller efciency.
4. Each compressor circuit shall be equipped with a 5%
line reactor to help protect against incoming power
surges and help reduce harmonic distortion.
5. [OPTIONAL] The chiller shall be equipped with a
factory-mounted and wired passive harmonic lter
guaranteed to meet the IEEE Standard 519 at an Isc/
IL ratio greater than 20.
B. Evaporator and Condenser:
1. 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. The
tubes shall be individually replaceable and secured to
the intermediate supports without rolling.
2. The evaporator shall be ooded type with [0.025
in.] –OR– [0.028 in.] –OR– [0.035 in.] wall [copper]
–OR– [90/10 CuNi] tubes rolled into [carbon steel]
–OR– [ceramic-coated steel] tubesheets. The water
side shall be designed for a minimum of [150 psig]
–OR– [300 psig]. The heads shall be [carbon steel]
–OR– [epoxy-coated steel] –OR– [Monel-clad] –OR–
[Stainless Steel]. Water connections shall be grooved
suitable for [grooved couplings] –OR– [anged
connections]. The evaporator shall have [dished
heads with valved drain and vent connections] –
OR– [shall be equipped with marine waterboxes with
removable covers and vent and drain connections].
The evaporator shall have [right-hand] –OR– [lefthand] connections when looking at the unit control
panel.
3. The condenser shall have [0.025 in.] –OR– [0.028
in.] –OR– [0.035 in.] wall [copper] –OR– [90/10
CuNi] –OR– [70/30 CuNi] –OR– [stainless steel]
–OR– [titanium] tubes rolled into [carbon steel] –
OR– [Monel-clad] –OR– [stainless steel clad] –OR–
[titanium-clad] – OR– [ceramic-coated] tube sheets.
Water connections shall be [grooved suitable for
grooved couplings]—OR– [anged]. The water side
shall be designed for a minimum of [150 psig] –OR–
[300 psig]. The condenser shall have [dished heads
with valved drain and vent connections] –OR– [shall
be equipped with marine waterboxes with removable
covers and vent and drain connections]. The
condenser shall have [right-hand]
–OR– [left-hand] connections when looking at the
unit control panel.
4. Provide sufcient isolation valves and condenser
volume to hold the full unit refrigerant charge in the
condenser during servicing or provide a separate
pumpout system and storage tank sufcient to hold
the charge of the largest unit being furnished.
5. An electronic expansion valve shall control refrigerant
ow to the evaporator. Fixed orice devices or oat
controls with hot gas bypass are not acceptable
because of inefcient control at low load conditions.
The liquid line shall have moisture indicating sight
glass.
6. 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.
7. [OPTIONAL] The evaporator vessel, including suction
line and any other component or part of a component
subject to condensing moisture (excluding the
waterbox), 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
ba rrie r.
8. [OPTIONAL] The evaporator waterbox 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.
9. Provide factory-mounted and wired, thermal-
dispersion water ow switches on each vessel to
prevent unit operation with no or low water ow.
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C. Vibration Isolation
1. Provide neoprene wafe-type vibration isolators for
each corner of the unit.
D. Power Connections
1. Power connection shall be single point to a factorymounted disconnect switch OR shall be multipoint to
each compressor power panel on two-compressor
units.
E. Chiller Control
1. The unit shall have a microprocessor-based control
system consisting of a 15-inch VGA touch-screen
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 and condenser water
temperatures
• Evaporator and condenser saturated refrigerant
pressures
• 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
• Evaporator water in and out temperatures,
refrigerant pressure and temperature
• Condenser water in and out temperatures,
refrigerant pressure and temperature
• 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. The alarm history shall be
downloadable from the unit’s USB port. An operating
and maintenance manual specic for the unit shall be
viewable on the screen and downloadable.
5. All setpoints shall be viewable and changeable (multilevel 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.
7. The chiller shall be capable of sequencing up to four
other similar chillers for WMC models. The contractor
shall furnish and wire network isolators for n-1 units.
8. The chiller shall be capable of 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 drive.
9. [OPTIONAL] The factory mounted controller(s)
shall support operation on a BACnet
L
onWorks
®
network via one of the data link / physical
®
, Modbus® or
layers listed below as specied 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
®
certied.
10. 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 notication as specied in the unit
sequence of operation and the unit points list.
11. For chillers communicating over a LonMark® network,
the corresponding LonMark
®
eXternal Interface File
(XIF) shall be provided with the chiller submittal data.
12. All communication from the chiller unit controller
as specied in the points list shall be via standard
BACnet
shall not be allowed. BACnet
shall conform to the BACnet
ASHRAE135-2001). A BACnet
®
objects. Proprietary BACnet® objects
®
communications
®
protocol (ANSI/
®
Protocol
Implementation Conformance Statement (PICS) shall
be provided along with the unit submittal.
13. [OPTIONAL] The chiller shall be equipped with the
capability to restart and reach full load quickly in
the event of a power interruption. The compressor
shall be capable of restarting within 43 seconds after
power is restored and shall reach 80% load within
120 seconds. Chillers not able to restart or load within
this time frame shall include a properly sized thermal
storage tank to maintain temperature stability in the
system.
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2.5. OPTIONAL ITEMS
A. 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. Non-witness performance test (water only) in
accordance with procedures and to the tolerances
contained in AHRI Standard 550/590.
– OR –
Witness performance test (water only) in accordance
with procedures and to the tolerances contained in
AHRI Standard 550/590.
5. OSHPD Certication: 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 wafe vibration pads.
– OR –
IBC Certication: The chiller shall be certied 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 wafe
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.
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.
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Daikin Applied Training and Development
Now that you have made an investment in modern, efcient Daikin Applied equipment, its care should
be a high priority. For training information on all Daikin Applied HVAC products, please visit us at
www.DaikinApplied.com and click on Training, or call 540-248-9646 and ask for the Training Department.
Warranty
All Daikin Applied equipment is sold pursuant to its standard terms and conditions of sale, including
Limited Product Warranty. Consult your local Daikin Applied representative for warranty details. To nd
your local Daikin Applied representative, go to www.DaikinApplied.com.
Aftermarket Services
To nd your local parts ofce, visit www.DaikinApplied.com or call 800-37PARTS (800-377-2787).
To nd your local service ofce, visit www.DaikinApplied.com or call 800-432-1342.
This document contains the most current product information as of this printing. For the most up-to-date
product information, please go to www.DaikinApplied.com.
Products manufactured in an ISO Certied Facility.
CAT 602-8 (1/16) ©2015 Daikin Applied | (800) 432–1342 | www.DaikinApplied.com
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