Marstair MB Series User manual

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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
A
B
C
E
E1
E2
F
mm
kg
MBMT125A
1010
727
520
363
455
-
-
345
15
MBMT125B
1279
727
520
363
455
-
-
345
16
MBMT130B
1731
727
520
426
455
-
-
345
18
MBMT130E
2491
727
520
426
455
-
-
345
20
MBMT230B
3541
1147
520
426
875
438
-
345
27
MBMT230C
4242
1147
520
426
875
438
-
345
29
MBMT230E
4814
1147
520
426
875
438
-
345
32
MBMT230BE
5507
1357
520
426
1085
543
-
345
37

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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
A
B
C
E
E1
E2
F
W
mm
kg
MBLT130B
1440
1099
727
520
426
455
-
-
345
18
MBLT130C
1843
1443
727
520
426
455
-
-
345
19
MBLT130E
2286
1776
727
520
426
455
-
-
345
20
MBLT130BE
2659
2099
832
520
426
560
-
-
345
23
MBLT230C
3732
2946
1147
520
426
875
438
-
345
29
MBLT230E
4789
3790
1147
520
426
875
438
-
345
32
MBLT330C
5929
4705
1567
520
426
1295
438
420
345
42
MBLT330E
7383
5834
1567
520
426
1295
438
420
345
44

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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
A
B
C
E
E1
E2
F
mm
kg
MWMT130B
1738
780
685
370
515
-
-
630
18
MWMT130C
2051
780
685
370
515
-
-
630
19
MWMT230B
3552
1260
685
370
995
498
-
630
30
MWMT230C
4378
1260
685
370
995
498
-
630
31
MWMT230E
5175
1260
685
370
995
498
-
630
34
MWMT330C
6563
1740
685
370
1475
498
480
630
43
CAPACITY
R404A
COIL DATA
MODEL
SC2:
Evaporating @ -8 ºC
SC3:
Evaporating @ -25 ºC
DIMENSIONS
WEIGHT
A
B
C
E
E1
E2
F
W
mm
kg
MWLT130B
1332
1012
780
685
370
515
-
-
630
19
MWLT130C
1787
1396
780
685
370
515
-
-
630
19
MWLT130E
2258
1751
780
685
370
515
-
-
630
21
MWLT230B
2823
2228
1260
685
370
995
498
-
630
30
MWLT230C
3465
2704
1260
685
370
995
498
-
630
32
MWLT230E
4611
3645
1260
685
370
995
498
-
630
34
MWLT330C
5474
4305
1740
685
370
1475
498
480
630
44
MWLT330E
7130
5657
1740
685
370
1475
498
480
630
47

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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
H
1 x H
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)
MB
35 bar
6 bar
MW
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
of
Poles
Fan
Diameter
MB
S4E250-AI02-01
-25
55
IP44
4
250
VNT 25-40 Ø254-28º
-40
40
IP41
4
254
S4E300-AS72-37
-40
60
IP44
4
300
VNT 34 45 Ø300-34º
-40
40
IP41
4
300
MW
S4E300-AS72-80
-25
70
IP44
4
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.