TM_MHW_2010_50-60Hz (UMITA)

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MHW Air Handling Unit (50/60)

Technical Manual

Engineered for flexib il ity and performance.TM

MHW - 2010 (50/60)

MHW015A MHW020A

MHW025A MHW030A

MHW035A MHW040A

MHW050A

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Contents

Nomenclature ...........................................................................................................................2

Features ...................................................................................................................................2

Electric Heater Power ...............................................................................................................3

Specications ...........................................................................................................................4

Components data .....................................................................................................................5

Sound data ...............................................................................................................................6

Performance correction coefcient ...........................................................................................7

Outline and dimensions ............................................................................................................8

Electrical data .........................................................................................................................10

Wiring diagrams......................................................................................................................11

Installation ..............................................................................................................................13

Service and maintenance .......................................................................................................15

Trouble shooting .....................................................................................................................16

Exploded view and part list .....................................................................................................17

McQuay is a registered trademark of McQuay International. All rights reserved throughout the world.

2010 McQuay International

Bulletin illustrations cover the general appearance of McQuay International products at the time of publication

and we reserve the right to make changes in design and construction at any time without notice.

Note:Installation and maintenance are to be performed only by qualied personnel who are

familiar with local codes and regulations, and experienced with this type of equipment.

Caution: Sharp edges and coil surfaces are a potential injury hazard. Avoid contact with them.

Warning:Moving machinery and electrical power hazard. May cause severe personal injury or

death. Disconnect and lock off power before servicing equipment.

Literature No.: TM-MHW-1001A

Supersedes: TM-MHW-0901

Part No.: M08039110015

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E:exportU:"Made in China" label

Design seriesA:220-240V/1Ph/50HzK:208-230V/1Ph/60Hz

L-Left hand (Facing discharge)R-Right hand (Facing discharge)

4-4 coil rows; 6-6 coil rows

A-Design Serial No.

030-Nominal airow is 3000 m3/h

MHW-McQuay super thinhorizontal air handling unit

MHW 030 A- 4 L -A AA E

Nomenclature

Features

General Information

McQuay for years has been committed to provide high quality air handling systems of various models and types,

and has made remarkable achievements in the industry. As a new generation of products, the MHW series slim

ceiling air handling units are launched by McQuay to adapt to the increasingly cramped building layout.

In addition to the outstanding performance of previous McQuay air handing units, the MHW series slim ceiling air

handling units feature a slim size, only 420mm in height. The airow is adjustable within the range of three levels to

meet different air ow needs. Powered by a 50 or 60Hz single-phase power supply, this series eliminates the need

for users to expand the power capacity. The MHW series can be mounted in a wide variety of places, especially those

with limited space and high noise. Featuring easy installation and exible use, the MHW series helps minimize theindoor space and maximize customers benets.

Structure

The high-strength galvanized steel sheets, coated with electrostatic spraying, are highly corrosion-proof.

Made of a new type of PE material, the heat insulator features ideal thermal insulation, sound absorption, and no

moisture permeability. The insulator is also proof against cold bridge.

Fans

With efcient tilted multi-blade centrifugal fans, this unit provides low noise but high reliability. The fan and the motor

are coupled directly. The high-precision and quality ball bearing eliminate the need for lubricating.

Multi-level Speed ControlDriven by a single-phase capacitor-running asynchronous motor, the unit can be adjusted at three levels to provide

different amounts of air ow.

Filters

The air inlet is equipped with primary nylon lters.

Heat Exchanger

Made on the OAK manufacturing facility the heat exchanger uses thin-walled copper tubes mechanically expanded

into new-type ns, to ensure close contact between the cooper tubes and ns. This enables the coils to provide best

heat exchange and the units to run reliably and efciently.

Performance

MHW series products feature high external total pressure (ETP) and large cooling capacity. Slim in size and simple

in structure, this series makes it easy for installation and maintenance.

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Electric Box Model Power Supply Capacity(kW)

MHW-EH-020BOX 220-240V/1Ph/50Hz 2

MHW-EH-025BOX 220-240V/1Ph/50Hz 2.5

MHW-EH-030BOX 220-240V/1Ph/50Hz 3

MHW-EH-035BOX 220-240V/1Ph/50Hz 3.5

MHW-EH-040BOX 220-240V/1Ph/50Hz 4

MHW-EH-045BOX 220-240V/1Ph/50Hz 4.5

MHW-EH-050BOX 220-240V/1Ph/50Hz 5

MHW-EH-055BOX 220-240V/1Ph/50Hz 5.5

MHW-EH-060BOX 220-240V/1Ph/50Hz 6

MHW-EH-065BOX 220-240V/1Ph/50Hz 6.5

MHW-EH-070BOX 220-240V/1Ph/50Hz 7

MHW-EH-075BOX 220-240V/1Ph/50Hz 7.5

Electric Heater Power

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Specications

MODEL MHW015A MHW020A MHW025A MHW030A MHW035A MHW040A MHW050A

NOMINAL AIR FLOW m3/h 1500 2000 2500 3000 3500 4000 5000

EXTERNAL TOTAL PRESSURE Pa 70 100 100 120 120 150 150

POWER SOURCE V/Ph/Hz 220-240V/1Ph/50Hz 208-230/1/60

N O M I N A L

CAPACITY

COOLING

4 ROWS(RETURN AIR)

kW

6 10 12 16 18 23 29

4 ROWS(FRESH AIR) 19 27 31 40 47 57 70

6 ROWS(RETURN AIR) 10 15 17 22 26 31 37

6 ROWS(FRESH AIR) 25 34 39 49 61 70 84

HEATING

4 ROWS(RETURN AIR) 11 16 19 24 28 34 42

4 ROWS(FRESH AIR) 21 30 34 43 52 61 73

6 ROWS(RETURN AIR) 15 21 23 29 36 42 50

6 ROWS(FRESH AIR) 26 36 41 51 64 74 87

WATER

FLOW

COOLING

4 ROWS(RETURN AIR)

m3/h

1.01 1.77 2.40 3.13 3.09 3.91 5.32

4 ROWS(FRESH AIR) 3.26 4.69 6.07 7.65 8.21 9.78 12.89

6 ROWS(RETURN AIR) 1.78 2.57 3.36 4.18 4.58 5.36 7.06

6 ROWS(FRESH AIR) 4.3 5.95 7.61 9.29 10.5 12.15 15.59

HEATING

4 ROWS(RETURN AIR) 0.96 1.38 1.80 2.27 2.42 2.91 3.83

4 ROWS(FRESH AIR) 1.85 2.57 3.26 4.07 4.47 5.28 6.83

6 ROWS(RETURN AIR) 1.27 1.78 2.28 2.79 3.14 3.64 4.69

6 ROWS(FRESH AIR) 2.30 3.14 3.98 4.84 5.52 6.36 8.10

WATER

PRESSUREDROP

COOLING

4 ROWS(RETURN AIR)

kPa

5 14 24 14 13 25 40

4 ROWS(FRESH AIR) 39 40 46 32 36 46 74

6 ROWS(RETURN AIR) 14 27 54 21 44 45 75

6 ROWS(FRESH AIR) 77 89 96 76 79 103 113

HEATING

4 ROWS(RETURN AIR) 4 12 10 9 11 19 24

4 ROWS(FRESH AIR) 20 26 24 26 20 31 67

6 ROWS(RETURN AIR) 12 24 24 12 32 30 32

6 ROWS(FRESH AIR) 42 49 62 56 53 68 70

UNIT DIMENSION

LENGTH

mm

750 910 1070 1220 1370 1520 1850

WIDTH 750 750 750 750 750 750 750

HEIGHT 420 420 420 420 420 420 420

PACKING DIMENSION

LENGTH 950 1110 1270 1420 1570 1720 2050

WIDTH 1030 1030 1030 1030 1030 1030 1030

HEIGHT 580 580 580 580 580 580 580

WEIGHT4 ROWS

kg76 80 86 92 96 102 108

6 ROWS 79 84 90 96 101 107 113

General data

NOTES:

1) ALL SPECIFICATIONS ARE SUBJECTED TO CHANGE BY THE MANUFACTURER WITHOUT PRIOR NOTICE.

2) THE ABOVE PARAMETERS ARE FOR STANDARD PRODUCTS ONLY .

3) STANDARD AIR RETURN COOLING CONDITIONS: 27DB/19.5WB; STANDARD FRESH AIR COOLING CONDITIONS: 34DB/28WB;

STANDARD COOLING WATER ENTERING/LEAVING CONDITIONS: 7/12

STANDARD AIR RETURN HEATING CONDITION: 21DB; STANDARD FRESH AIR HEATING CONDITION: 0DB;

STANDARD HEATING WATER ENTERING/LEAVING CONDITIONS: 60/50

4) THE PARAMETERS IN THE ABOVE TABLE ARE MEASURED AT THE ALTITUDE OF 0M ABOVE SEA LEVEL, AND MAY VARY WITH

THE ALTITUDE.

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Components data


STRUCTURE TYPE Galvanized steel coated with elextrostatic spraying, internal glued with insulator PE

COIL

TYPE Corrugated aluminum n mechanically bonded with copper tube

TUBE DIAMETER(mm) 9.53

FPI 12

WORK PRESSURE(MPa) 1.6

INLET/OUTLET PIPE R1

CONDENSING WATER PIPE R1

FAN

TYPE/MATERIAL Centrifugal forward curved blower and galvanized steel

FAN NO. 1 2

DRIVE TYPE Direct drive

AIR DISCHARGE Lower horizontal air discharge

MOTOR

TYPE Single phase capacitor running

QUANTITY 1 2

INDEX OF PROTECTION(IP) IP20

INSULATION CLASS B

FILTER

TYPE/MATERIAL Primary nylon

SIZE

THICKNESS

mm

21

HEIGHT 345

LENGTH 536 696 856 1006 1156 1306 1636

NOTES:

ALL SPECIFICATIONS ARE SUBJECTED TO CHANGE BY THE MANUFACTURER WITHOUT PRIOR NOTICE.

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Sound data

Unit ESP Speed1/1 Octave Sound pressure level (dB(A), ref 20Pa)

OveralldB(A)

63 125 250 500 1k 2k 4k 8k

MHW015A 70Pa

High 24 36 34 40 38 34 27 19 44.1

Medium 21 33 30 37 34 30 21 15 40.7

Low 19 31 27 34 30 27 17 14 37.7

MHW020A 100Pa

High 28 43 43 43 46 41 33 27 50.6

Medium 27 41 41 41 42 38 30 23 48.0

Low 25 38 37 39 40 35 26 20 45.1

MHW025A 100Pa

High 37 49 49 50 48 46 37 27 55.7

Medium 34 46 46 46 44 42 33 23 52.2

Low 28 45 40 42 39 36 28 18 48.4

MHW030A 120Pa

High 29 45 46 46 46 40 33 25 52.5

Medium 27 43 46 44 43 37 29 21 50.5

Low 26 42 44 42 40 34 26 17 48.5

MHW035A 120Pa

High 37 46 45 47 46 45 43 36 53.5

Medium 35 45 43 46 45 44 41 35 52.1

Low 33 43 41 44 43 42 40 33 50.2

MHW040A 150Pa

High 30 45 44 48 49 44 35 27 53.6

Medium 29 43 42 46 47 41 32 24 51.5

Low 27 43 40 45 43 38 29 21 49.5

MHW050A 150Pa

High 35 49 49 50 52 48 40 33 57.0

Medium 34 49 48 49 51 47 39 32 56.0

Low 31 49 47 48 49 45 37 30 54.9

NOTE:

SOUND PRESSURE LEVELS ARE TESTED IN BAFFLE CHAMBER, WITH BACKGROUND NOISE LEVEL: 11.5 dB(A), MICROPHONE

POSITION IS 1 METER IN FRONT AND 1 METER BELOW THE UNIT.

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Performance correction coefcientCooling capacity performance curve

The above curve shows the cooling capacity variations at different

entering water temperatures.

Standard return air: 27C DB/19.5C WB;

Temperature difference between entering and leaving water: 5C

The cooling capacity correction factors are based on the cooling

capacity (using 1 as the coefcient) in standard cooling water entering/

leaving conditions (7C for entering water/12C for leaving water).

The above curve shows the cooling capacity variations at different


Standard return air: 34C DB/28C WB;


The cooling capacity correction factors are based on the cooling



Heating capacity performance curve

The above curve shows the heating capacity variations at different


Standard return air: 21C DB;

Temperature difference between entering and leaving water: 10C.

The heating capacity correction factors are based on the heating



The above curve shows the heating capacity variations at different


Standard return air: 0C DB;


The heating capacity correction factors are based on the heating



NOTES:

1) THE BLACK CURVE SHOWS THE CAPACITY OF A 4-ROW-COIL UNIT AND THE GRAY CURVE THE CAPACITY OF A 6-ROW-COIL UNIT.

2) COMPARED WITH THE COEFFICIENT (SET TO 1) OF THE UNIT IN STANDARD OPERATING CONDITIONS (ENTERING WATER

AT 60C, AND LEAVING WATER AT 50C), THE VARIATION COEFFICIENT VARIES AS FOLLOWS WHEN THE ENTERING WATERTEMPERATURE RETAINS AT 45C AND THE LEAVING WATER TEMPERATURE AT 40C:

STANDARD AIR RETURN CONDITION: 0.65 FOR A 4-ROW-COIL UNIT AND 0.64 FOR A 6-ROW-COIL UNIT; STANDARD FRESH AIR

CONDITION: 0.8 FOR A 4-ROW-COIL UNIT AND 0.78 FOR A 6-ROW-COIL UNIT.

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Outlines and dimensions

DimensionsModel

A B C D

MHW015A 750 540 238 667

MHW020A 910 700 318 827

MHW025A 1070 860 398 987

MHW030A, MHW035A, MHW040A, MHW050A

DimensionModel

A B C D E

MHW030A 1220 1010 268 176 1137

MHW035A 1370 1160 323 216 1287

MHW040A 1520 1310 333 346 1437

MHW050A 1850 1640 398 546 1767

Unit: mm

Unit: mm

MHW015A, MHW020A, MHW025A

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Flexile Pipe Connection

Electrical Heater

MHW Unit

Electric Box

Scheme of Electric Box Installation

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Electrical data


POWER SOURCE 220V/1/50Hz

MOTOR

TYPE Asynchronous single phase

INSULATION CLASS B

PROTECTION CLASS IP20

RATED INPUTPOWER

4 ROWSw

373 614 787 797 905 1248 1533

6 ROWS 397 653 823 845 1016 1362 1699

RATED INPUTCURRENT

4 ROWSA

1.72 2.96 3.61 3.62 4.22 5.68 6.98

6 ROWS 1.81 3.01 3.78 3.96 5.10 6.29 7.86

NOTES:


2) ALL DATA ARE BASED ON HIGH SPEED,STANDARD ESP.


POWER SOURCE 220V/1/60Hz

MOTOR

TYPE Asynchronous single phase

INSULATION CLASS B

PROTECTION CLASS IP20

RATED INPUTPOWER

4 ROWSw

279 387 945 619 733 1584 2063

6 ROWS 273 445 1137 681 1222 1607 2134

RATED INPUT

CURRENT

4 ROWSA

1.28 1.79 4.35 2.83 3.41 7.59 9.55

6 ROWS 1.25 2.03 5.29 3.19 5.97 7.73 9.89

NOTES:


2) ALL DATA ARE BASED ON HIGH SPEED,STANDARD ESP.

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Wiring diagrams



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FACTORY WIRINGFIELD WIRING

TB1-2TERMINAL BLOCK

FFUSE FOR TEMP.

NOTE:

THTHERMAL OVERLOAD SWITCH

DPSDIFFER. PRESS SWITCH

TB2 NL

TH

TB1 B

F

A

DPS

ELE-HEATER

RED

BLUE

220Vac(Main Power)

L N PECONTROL CIRCUIT

RED

RED

G/Y

PROTECTOR

WIRING OF ELE-HEATER

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Installation

Important Notice

Installation and maintenance are to be performed only by technicians who are familiar with local rules and regulations,

and experienced with this type of equipment.

Make sure that the rated voltage of the power supply conforms to the voltage stated on the unit nameplate.

Cut off all power supplies before mounting or maintaining the unit.Electric connections must conform to local laws and regulations.

The voltage should uctuate within the range of 10% of the rated voltage.

The unit must be well earthed to prevent insulation failures.

All the wires must be securely connected.

The design of water pipes and ducts must conform to the specications of heating, ventilation and air conditioning

norms and regulations.

Mounting Location

Make sure its convenient to connect wires and pipes in the selected mounting location. The minimum space reserved

around MHW units is shown in Figure 1.

Figure 1

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Suspending Installation

During suspending installation, please handle the unit or packing case with care, to avoid damage to any part.

Before leaving the factory, the unit or its packing case already has forklift handling holes or hoisting holes. During the

hoisting, the lifting poles should be strong enough to bear the unit weight. Please handle the MHW unit as shown in

Figure 2.

Storage

When a unit is placed outdoors before it is installed in an equipment room, please protect it from dirt, rain, snow and

even animals. Be sure not to damage the protective lm on its surface.

Base Setup

Adjust the base level.

The base, if not on a level surface, may result in water leakage or break the dynamic balance of the fan due to poor

drainage of condensing water, or cause the bearing malfunction or vibrate.

The base height should match the U-shaped pipe bend. The drain pipe should be connected with the U-shaped water

seal, as shown in Figure 3.

Drain bend

Drain pipe

Figure 2

Figure 3

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Service and maintenance

Notices

Responsibilities and Obligations

This product comes to you with the McQuay service warranty. Only McQuay technicians or experienced technicians

authorized by McQuay are allowed to install, test or maintain these products.

Use the Unit

After installing the piping system, please rst ush the pipes. To do so, be sure to shut off the valve connected to the

unit, to prevent contamination in the pipes from entering the coils or blocking the loop.

After the installation, please check there is anything sundries inside the fan. Turn the blades by hand. If no unusual

noise is heard, turn on the fan, to see if it is running properly.

Before turning on the water ow, please open the exhaust valve to let the air out of the pipe till water ows from the

pipe.

When the unit stops running, ll the coil with water or by other means to prevent pipe corrosion.

When the environment temperature falls below 0C in the winter, drain the pipe to prevent it from freezing.

Clean the coils at regular intervals, to remove the dust from the coils. Clean the scale inside the coils every 2 or 3

years. If possible, please use soft water in the coils.Check the unit lter for dust regularly; if possible, please use a pressure difference gauge. Once the resistance

reaches the limit, wash or replace the lter media in time.

After the unit runs for a week, please readjust the V-belt. Afterwards, check the belt every three months.

Service and Maintenance

A good maintenance schedule helps reduce operational failures.

A dirty lter may worsen the performance and air ow of the unit. Thus, replace or wash the lter in time. Be sure to

check the lter every month to see if it is clean enough.

Wash the coils with compressed air or water. Brush the coil surface gently with a soft brush or use a vacuum cleaner

to clean the dust.

Do the following on a regular basis:Clean up the fans every 6 months, to keep them in good balance.

Check and clean the drain pan. Check the drain pipe in case dust or sundries block the pipes.

Clean the dirt in the water coils at regular intervals.

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Trouble shooting

Commonfailures Location Possible causes Solutions

Abnormalsound

1. Blower

Blower offset Contact the dealer

Loose bearing due to big gap Contact the dealer

Blower is loose Contact the dealer

Blower is damaged Contact the dealer

The fastening fan screw is loose Fasten the screw

There are sundries inside fans Remove sundries

2. Drive The screw xing the motor to the motor base is loose Fasten the screw

3. Fan housing

There are sundries inside housing Remove sundries

Housing is loose Contact the dealer

Air intake housing is damaged Contact the dealer

4. Electric appliancesIncoming wire is loose Fasten the incoming wire

Motor gives AC hum Contact the dealer

5. Shaft

Bent or distorted Replace shaft

Balance weight is loose Fasten the balance weight

Shaft is loose Fasten shaft

6. Air speed is toohigh

Duct is too small Re-design the ductStatic pressure doesn't reach the designed ESP value Use the lower fan speed.

7. Periodical vibration

Duct is too small Re-design the duct

System is unstable Adjust the system

Duct vibrates as the fan pulsates Adjust the fan speed

8. Noise caused byhi-speed windpassing the gap &holes

Duct leaks Seal it with glue

9. When blocked, thehigh-speed airrattles or howls

Duct bends abruptly Re-design duct

Duct expands sharply Re-design duct

Duct shrinks sharply Re-design duct

Air speed is too high inside duct Re-design duct

Anti-vibration joint is too high Re-adjust the damping connector

Fanoperatesnormallybut the

air ow isinsufcient

1. Fan Blower is mounted incorrectly Contact the dealer.

2. Duct system

Actual resistance exceeds the designed value. Re-design the system

Duct is poorly sealed Seal it with glue

Fireproof damper is shut off Turn on the reproof damper

3. Filter Too dirty or blocked Clean or replace the lter

4. Coil Too dirty or blocked Clean coils

5. Air ow isshort-circuited.

The air inlet and air outlet are not properly isolated. Thus, the airruns directly to the air inlet Add air separator

6. Fan inlet is blockedElbow at the air return area fan outlet are too close to the unitwallboard Move the fan

The fan outlet is blocked Remove the obstructions

7. No straight tube atthe fan air outlet

A length of straight tube is mounted at the fan outlet during fan

testing. Without straight tube, the fan performance might beworsened. Thus, the fan may run faster to overcome the resistance(check the fan speed)

Install straight tube

8. There are sundriesinside fan system

The fan outlet is blocked Remove the obstructions

There is an elbow tube at the fan outlet Re-design duct

The fan isfunctioningbut the airsupply istoo large

1. System

Improper duct size Re-design

The access door is open Close the access door

The system is not well balanced and the actual resistance is lowerthan the set resistance Re-design the system

No air damper or air damper blade Install air damper or air damperblade.

Filter falls off or no lter installed Re-mount the lter

2. Duct Return duct leaks Seal with glue

The air in

the air-conditionedroom is

not freshenough

1. Filter Filter is too dirty or blocked Clean or replace lter

2. Fresh air No enough fresh air Supply more fresh air

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Exploded view and part list


1.Top panel 2.Assy.,coil 3.Drainpan

4.Check panel 5.Inlet/outlet panel 6.Long wind guard

7.Filter 8.Short wind guard. 9.Base panel

10.Side panel 11.Blower 12.Motor

13.Front panel 14.Flange 15.Hanging angel

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1.Top panel 2.Assy.,coil 3.Drainpan

4.Check panel 5.Inlet/outlet panel 6.Long wind guard

7.Filter 8.Short wind guard. 9.Base panel

10.Side panel 11.Blower 12.Motor

13.Front panel 14.Flange 15.Hanging angel

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Main part number

Model Discription MHW030A MHW035A MHW040A MHW050A

Blower Left M03029001982 M03029001982 M03029001982 M03029001982

Blower Right M03029001983 M03029001983 M03029001983 M03029001983

Motor (4 Rows)

50HzClockwise M03039012176 M03039012178 M03039012180 M03039012184

Anti-clockwise M03039012177 M03039012179 M03039012181 M03039012185



Motor (6 Rows)





Filter M03084352004 M03084352005 M03084352006 M03084352007

Drain Pan M50014351504 M50014351505 M50014351506 M50014351507

Terminal Block M04119003747 M04119003747 M04119003747 M04119003747

Model MHW015A MHW020A MHW025A

Blower M03029001982 M03029001982 M03029001982

Motor(4 Rows)

50HzClockwise M03039012174 M03039012186 M03039012184

Anti-clockwise M03039012175 M03039012187 M03039012185

60HzClockwise M03039001107 M03039001116 M03034350006


Motor(6 Rows)

50HzClockwise M03039012177 M03039012181 M03039012189


60HzClockwise M03039001109 M03039001111 M03034350006


Filter M03084352001 M03084352002 M03084352003

Drain Pan M50014351501 M50014351502 M50014351503

Terminal Block M04119003747 M04119003747 M04119003747

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2010 McQuay International +1 (800) 432-1342 www.mcquay.com

While utmost care is taken in ensuring that all details in the publication are correct at the time of going

to press, we are constantly striving for improvement and therefore reserve the right to alter model

specications and equipment without notice.

Details of specications and equipment are also subject to change to suit local conditions and requirements

and not all models are available in every market.

TM_MHW_2010_50-60Hz (UMITA)

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Transcript of TM_MHW_2010_50-60Hz (UMITA)