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.

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3.8 Sound Level
•In the below tables, Sound level of products with standard fans are given in db(A) (decibels)
for 3 m distance. Values are obtained from fan manufacturers, and they are only for making a
comparison, in different installation conditions different values can be obtained.
Sound levels are calculated according to EN 13487 standard.
MB
No. of Fans
Fan Dia.
1
2
3
Ø250
33
-
-
Ø250
37
-
-
Ø300
37
40
42
Ø300
41
44
46
MW
No. of Fans
Fan Dia.
1
2
3
Ø300
40
43
45
•Earpiece must be worn when sound pressure level is over 85 dB(A).
3.9 Capacity Measurement
•Measurement points are taken as shown below.
Figure 3.8.1 Measurement point
• Tr: Cold room temperature
Te: Evaporation temperature
Tsup: Superheating temperature
For optimal cooling performance (Tsup-Te) should be 0,7 times bigger than (Tr-Te)

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•Make sure all electric connections are tightened.
•Make sure all fan screws are tightened.
•Make sure heat exchanger mounting is level and stable.
•Make sure all of the defrost heaters are working properly.
•Because of the high humidity of the ambient air high icing formation may be seen during the
first start-up. For this reason check icing formation if it occurs.
•Observe defrost cycle.
•Make sure that the system is evacuated well from air. There should not be air pockets
inside of the coil.
•Cables should not be affected by heat of resistance.
•Check the defrost process. Defrost time can be extended if it is not enough to melt all of the
ice.
•The coil heater is extremely hot. Do not touch without gloves. Be wary of any material
splashing and wear protective goggles.
•Fans, cables, etc. in case of fire shut off electricity immediately. Use a fire extinguisher
suitable for electrical materials.
Products for spare parts, please contact Marstair. Any spare parts taken from other companies,
Marstair will not be responsible in case of any damage and will be out ofwarranty.
•Please ensure that all maintenance work is done by authorised persons.
•Regular inspection and periodic maintenance is enough to ensure long time usage.
•Make sure drainage water easily flows away. Please see water flows away easily with
opening drain pan and side cover.
•Commercial leakage detector can be used in detecting leakages.
• Make sure each fan is running freely.
•Visually inspect all of the electrical wiring connections.
•Observe ice formation and examine defrost cycle.
•Gas circulation must be stopped during maintenance.
6.1 Changing Defrost Heaters
•Electric defrost heaters come in two configurations. One is for light ice formation between 0º
C and 5º C temperatures and the other one is for heavy ice formation below 0º C temperatures.
•Before anything is done make sure electric power is off
•Open the terminal box.
•Make sure that heating elements are not extremely hot.
•Disassemble coil heating elements by removing retaining rings and change them with
new ones.
Figure 6.1.1 Disassembling coil resistances

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Figure 6.1.2 Disassembling coil resistances
Figure 6.1.3 Changing drainage tray resistances
6.2 Changing Fans
•Ensure that electric power is off.
•Disassemble fan screws.
•Remove electrical wirings.
•Assemble the fan and be sure of the alignment.
• Please repeat instructions.
Changing fan motor;
•Proceed the upper instruction until dissembling fan.
•Remove fan motor wirings.
• Remove fan motor from its place and change the new ones.
•Please repeat instructions.
6.3 Cleaning
•Periodically clean the product with brush and pressurized water.
•Remove the drainage line connection.
•Remove the drainage tray and clean it properly.
•Take care of the drainage line and drainage tray during cleaning.
•Hold the cleaning water vertical to the fins not to harm them.
•Rinse the product until all residues are gone.
Figure 6.3.1 Preparation for cleaning

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Figure 6.3.2 Hold the water vertical.
Problem
Reason
Solution
The product doesnot
operate
-Power is off
-Connection damage
-Check the power. Check the
fuses
-Check connections
Fans are not operate
-Power is off
-Block of rotation
-Check the power
-Be sure fan runs smoothly
and freely
Temperature is too high
-Heat exchanger is covered
with ice
-Not enough refrigerant
-Leakage
-Check the heat exchanger
fin surfaces
-Add refrigerant
-May be a fault before
evaporator inlet.
- Check for gas leaks. If
there is no leakage add the
correct amount of gas, if
there is a leakage, check
the “leakage occurs” section.
Defrost is not working
-Power is off
-Electrical connections
loosen
-Check the power
-Control the electrical wiring
-If there is heater malfunction,
change it with new one.
Leakage occurs
-Deformation in tubes
-Control the system tightness
and get in contact with
manufacturer
Not enough air flow
-Polluted heat exchanger
-Heat exchanger is covered
with ice
-Clean the fin surface
-Deice the heat exchanger
fin surfaces
Noisy operation
-Icing occurs on fan surface
-Fan blade damage
-Refrigerant noise
-Deice the fan surfaces
-Change fans
-Get in contact with the
project firm

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Dl (Maximum time between consecutive defrosts) = 8
D6 (Terminal display during defrost) = 0 (Alternating display of temperature and def
value)
Dc (Time base for defrost) = 0 (dl in hours, dP1 and dP2 in minutes)
D10 (Defrost time in running mode) = 5
F2 (Evaporator fans with compressor OFF) = 0 (see parameter f0)
The AUX output configuration is set to a normally de-energised alarm by default.
Defrost configuration set to electric heater by temperature.