Marstair MB Series Manual de usuario

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MB & MW SERIES AIR COOLER AND UNIT COOLER

USER MANUAL

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Cold Room Evaporator Manual Index

1. Introduction 3

1.1 Model Explanation 3

2. System (Product Description, Application Area, Working Principle) 3

2.1 MBMT/MBLT Type Cold Room Evaporators 4

2.2 MWMT/MWLT Type Cold Room Evaporators 5

3. Safety Instructions 6

3.1 Positioning 6

3.2 Installation 8

3.3 Piping 8

3.4 Connections 8

3.5 Drainage 10

3.6 Fan 10

3.7 Refrigerant Charge 10

3.8 Sound Level 11

3.9 Capacity Measurement 11

4. Operation 12

5. Spare Parts 12

6. Maintenance 12

6.1 Changing Defrost Heaters 12

6.2 Changing Fans 13

6.3 Cleaning 13

7. Troubleshooting (Failure-Cause-Solution) 14

8. MB/MW Interconnecting Wiring Diagram 15

9. Parameters 16

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This manual includes Marstair production of MB and MW types of Cold Room Evaporators which

are used in the cooling sector. MB are box type and MW are wedge type ceiling mounted coolers.

Please read this manual carefully to ensure correct usage and maintenance of your products.

1.1 Model Code Explanation

M:Marstair (MB/MW)

B :Type (Box/Wedge)

MT :Unit Temp (Medium Temp/ Low Temp)

1 :No. of fans ( 1, 2 or 3)

25 :Fan Diameter (25-30cm)

A :Design Spec (A, B, BE,C, E)

1) Product Casing

2) Connector

3) Fan

4) Fan Motor

(Klemens)

5) Drainage Tray

6) Drainage Connector

7) Coils

8) Inlet & Outlet Connections

9) Hinge

10) Terminal Box

Figure 2.0 General view of product

1. TEV Ltd recommend that personnel working on this equipment be skilled and fully conversant with

the appropriate Air Conditioning, Refrigeration and Electrical practices and have sound knowledge

of current Industrial Safe Working practices.

2. These units contain live electrical components, moving parts and refrigerant under pressure

3. Always site out of reach of children and protect from vandalism

4. The data plate gives information for the evaporator unit only

GENERAL

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Refrigerant circulates around the system, while the ambient air is drawn through the coil by the

fans. During the cooling process air humidity may cause icing problems and defrosting may be

required. Coolers are manufactured with electric defrost.

2.1 Marstair Box type Cold room evaporator

MB type cold room evaporators are manufactured for use in small and medium commercial

areas. They have Ø250mm, Ø250mm, Ø300mm, Ø300mm diameters for fans 4,2mm, 6,0mm,

8,0mm and 10mm fin spacing is standard. Drainage tray has hinged design for easy

maintenance. MB types can be manufactured with up to 3 fans.

Figure 2.1.1 –MB Evaporator

COIL DATA

MODEL

SC2:

Evaporating @ -8 ºC

DIMENSIONS

WEIGHT

MBMT125A

1010

727

520

363

455

345

MBMT125B

1279

727

520

363

455

345

MBMT130B

1731

727

520

426

455

345

MBMT130E

2491

727

520

426

455

345

MBMT230B

3541

1147

520

426

875

438

345

MBMT230C

4242

1147

520

426

875

438

345

MBMT230E

4814

1147

520

426

875

438

345

MBMT230BE

5507

1357

520

426

1085

543

345

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2.2 Marstair Wedge Type Cold Room Evaporator

MW type cold room evaporators are manufactured to be ceiling mounted. They have fans with

Ø300mm fan diameter and they are configurable with up to 3 fans. 4,2mm and 7,00mm are

the standard fin spacing. Drainage tray has a hinged design for easy maintenance.

Figure 2.2.1 - MW Evaporator

CAPACITY R404A

COIL DATA

MODEL

SC2:

Evaporating @ -8 ºC

SC3:

Evaporating @ -25 ºC

DIMENSIONS

WEIGHT

MBLT130B

1440

1099

727

520

426

455

345

MBLT130C

1843

1443

727

520

426

455

345

MBLT130E

2286

1776

727

520

426

455

345

MBLT130BE

2659

2099

832

520

426

560

345

MBLT230C

3732

2946

1147

520

426

875

438

345

MBLT230E

4789

3790

1147

520

426

875

438

345

MBLT330C

5929

4705

1567

520

426

1295

438

420

345

MBLT330E

7383

5834

1567

520

426

1295

438

420

345

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•Installation, electricalconnections and operation should be done byauthorized and trained

persons.

•System must comply with refrigerant type, range of working pressure and range of

working temperatures which are shown on product labels.

•The project firm which performs installation should observe EMC Guideline during

installation of control units. (EMC 89/336/EEC)

COIL DATA

MODEL

SC2:

Evaporating @ -8 ºC

DIMENSIONS

WEIGHT

MWMT130B

1738

780

685

370

515

630

MWMT130C

2051

780

685

370

515

630

MWMT230B

3552

1260

685

370

995

498

630

MWMT230C

4378

1260

685

370

995

498

630

MWMT230E

5175

1260

685

370

995

498

630

MWMT330C

6563

1740

685

370

1475

498

480

630

CAPACITY

R404A

COIL DATA

MODEL

SC2:

Evaporating @ -8 ºC

SC3:

Evaporating @ -25 ºC

DIMENSIONS

WEIGHT

MWLT130B

1332

1012

780

685

370

515

630

MWLT130C

1787

1396

780

685

370

515

630

MWLT130E

2258

1751

780

685

370

515

630

MWLT230B

2823

2228

1260

685

370

995

498

630

MWLT230C

3465

2704

1260

685

370

995

498

630

MWLT230E

4611

3645

1260

685

370

995

498

630

MWLT330C

5474

4305

1740

685

370

1475

498

480

630

MWLT330E

7130

5657

1740

685

370

1475

498

480

630

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3.1 Positioning

•Make sure the air circulation fulfills the entire room.

•Keep enough space for maintenance. Make sure the side panels and drainage tray are easily

removable

•Avoid mounting evaporators above doors.

•Ensure optimum piping and drainage lines

•Sample dimensions for positioning are given below in the table. (H: Evaporator Height).

Please consult your project firm for exact dimensions.

Evaporator

Height

Distance

between

product and

back wall

Distance

between

product and

side wall

Distance

between

product and

product

Distance

between

product and

front wall

Distance

between

product and

floor

1 x H

2 x H

5 x H

3 x H

Figure 3.1.1 Layout plan for positioning (to

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3.2 Installation

•Ensure that product mounting is level and stable.

3.3 Piping

Figure 3.2.1 Connector

•Be careful choosing and assembling suction line and its parts for piping. Optimum piping has

enough refrigerant or velocity for effective circulation and has a pressure drop which does not

reduce system performance.

3.4 Connections

•At the factory products are always tested with air for leakages and contain a nitrogen holding

charge.

Model

Test Pressure (air)

Transport Pressure (Nitrogen)

35 bar

6 bar

35 bar

6 bar

•Do not keep the connections in open position or in contact with atmospheric air

•Insert the correct amount of refrigerant in the heat exchanger. This information should be

determined by the Project engineer.

Figure 3.4.1 Correct and incorrect connections

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Figure 3.4.2 Correct and incorrect connections

•Do not hold welding torch directly to the product

Figure 3.4.3 Correct usage of welding flame

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3.5 Drainage

•Make sure the drainage line is gradually lower than the drainage pan, so drainage line must

be downward sloping for easy drainage.

Figure 6.8 Example of recommended drainage line

3.6 Fan

•

MB types have inflow fans, MW types have outflow fans.

•Before the first start-up make sure fan is completely rotatable and able to run freely.

•All models have axial fans as standard.

Model

Fan

Min.

Working

Tempera

ture

ºC

Max.

Working

Temperature

ºC

Protection

Class

Number

Poles

Fan

Diameter

S4E250-AI02-01

-25

IP44

250

VNT 25-40 Ø254-28º

-40

IP41

254

S4E300-AS72-37

-40

IP44

300

VNT 34 45 Ø300-34º

-40

IP41

300

S4E300-AS72-80

-25

IP44

300

3.7 Refrigerant Charge

•Product is charged with a nitrogen holding charge (6 bar pressure). For this reason, inside of

tubes should be cleaned out with vacuum before charging with refrigerant.

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