Marstair MCU+ 180-200 User manual

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GENERAL
TECHNICAL MANUAL
MCU+ 180-200
This manual provides technical and installation information for
MCU+180m - 200 Condensing Unit:
550 series MCU+ condensing units
INDEX PAGE
GENERAL Part numbers, dimensions and weights 2
Unit features/accessories
SELECTION Performance data, Air volume & airflows 3
Acoustic Data & Sound Power/Pressure Levels
ELECTRICAL Electrical data, electrical loads 3-4
Recommended fuse sizes
UNIT MCU+ Installation, Pipework/restrictors, 4-7
INSTALLATION Electrical connections, Evacuating and charging
Head Pressure Control
COMPONENT 8
IDENTIFICATION
}R134A Refrigerant
1.
Marstair 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 are supplied pre-charged with R134A refrigerant and polyolester oil.
Do not open the valves until the system is fully installed.
Do not mix oils or refrigerants.
3.
These units contain live electrical components, moving parts and refrigerant under pressure.
Always site out of reach of children and protect from vandalism.
4.
The data plate only gives information for the outdoor unit. For system details add input power and
current of indoor and outdoor unit, including any heater load.
5.
FUSES- for recommended fuse size see indoor unit instructions.

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550 Series CONDENSING UNITS (MCU/MCU+)
MCU+ 3Ph
Scroll
180
200
R134A
TBA
55033054
UNPACKED DIMENSIONS AND WEIGHTS
CONDENSING UNITS
Model
MCU+ 180
MCU+ 200
HEIGHT* mm
1275
1275
WIDTH mm
1100
1100
DEPTH mm
425
425
WEIGHT
kg
3 Ph
118
173
*Includes 60mm for mounting feet.
PACKED DIMENSIONS AND WEIGHTS
CONDENSING UNITS
Model
MCU+ 180
MCU+ 200
HEIGHT mm
1280
1280
WIDTH mm
1215
1215
DEPTH mm
465
465
WEIGHT
kg
3 Ph
123
178
FEATURES/ACCESSORIES
OUTDOOR
MCU+
Fan speed head pressure control
STD
LP cutout auto
STD
HP cutout auto
STD
HP cutout manual
*
Isolator
*
Low ambient start / 3 minute delay
STD
Wall mounting brackets
*
Contactor
STD
Overload (standard on 3Ph)
STD
Compressor jacket
*
Volt free alarm relay
*
Key: * = site option STD = standard

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AIRFLOWS OUTDOOR/DUCTED UNITS
Model
MAX Speed
MCU+
m3/s
180 - 200
1.85
TECHNICAL INFORMATION
MCU+ 180 - 200 Capacities R134A
SOUND POWER and SOUND PRESSURE LEVEL
MAXIMUM SPEED
SOUND POWER LEVELS
SOUND PRESSURE LEVELS
Frequency Hz
MCU+
Compressor
125
250
500
1K
2K
4K
dBA
dBA
NC
180
Scroll
72.5
71.9
71.7
68.9
66.0
58.2
75.5
59.2
53.0
200
Scroll
73.0
71.8
71.5
70.1
66.1
58.3
75.7
62.0
56.0
MINIMUM SPEED
SOUND POWER LEVELS
SOUND PRESSURE LEVELS
Frequency Hz
MCU+
Compressor
125
250
500
1K
2K
4K
dBA
dBA
NC
180
Scroll
65.7
65.9
67.1
61.3
65.3
55.1
73.2
53.7
49.0
200
Scroll
66.5
66.1
67.9
66.7
66.0
57.2
75.6
55.6
51.0
Sound Power Levels were obtained in full accordance with the direct method of ISO 3741: 1988. Quantities are shown in dB with a standard
reference of 1 pW.
Sound Pressure Levels are dB relative to 2 x 10-5N/m2and are calculated from the results under anechoic conditions and are quoted as an
average of all points on a sphere of a radius of 3m away from the centre of the unit (in cooling mode); (add 3dBA or 3NC for units at an
intersection of a wall, add 1dBA or 1NC for high level wall mounted units).
ELECTRICAL DATA (Cooling Data rated at 55C external conditions)
MCU+
180
200
FAN MOTOR
1.2
1.2
R134A COMPRESSOR (3 PHASE) NOMINAL FLA
11.9
16.9
MODEL
AIR ON TO
CONDENSER
C
EVAPORATING TEMPERATURE
-15
-12.5
-10
-7.5
-5
-2.5
0
2.5
5
7.5
10
TOTAL
TOTAL
TOTAL
TOTAL
TOTAL
TOTAL
TOTAL
TOTAL
TOTAL
TOTAL
TOTAL
MCU+
180
25
5.51
6.21
6.98
7.82
8.73
9.71
10.80
11.95
13.15
14.50
15.95
30
5.22
5.90
6.64
7.44
8.31
9.26
10.30
11.40
12.60
13.85
15.25
35
4.92
5.57
6.28
7.05
7.89
8.80
9.78
10.85
12.00
13.20
14.55
40
-
5.33
6.01
6.76
7.57
8.45
9.40
10.40
11.55
12.75
14.00
45
-
-
5.64
6.36
7.13
7.97
8.87
9.85
10.90
12.05
13.30
50
-
-
-
5.84
6.57
7.35
8.21
9.13
10.10
11.20
12.35
55
-
-
-
-
5.99
6.72
7.52
8.38
9.31
10.30
11.40
MCU+
200
25
6.07
6.89
7.80
8.80
9.90
11.06
12.24
13.92
15.75
17.18
18.48
30
5.69
6.48
7.35
8.30
9.35
10.48
11.67
13.13
14.85
16.22
17.76
35
5.46
6.21
7.04
7.94
8.93
10.03
11.10
12.48
14.01
15.33
16.88
40
-
5.93
6.71
7.58
8.53
9.56
10.67
11.85
13.27
14.65
16.28
45
-
-
6.34
7.16
8.04
9.01
10.01
11.17
12.36
13.71
15.48
50
-
-
-
6.57
7.40
8.30
9.29
10.28
11.29
12.61
14.39
55
-
-
-
-
6.74
7.58
8.50
9.37
10.26
11.48
13.30

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FUSES
The system and its supply/interconnecting wiring must be protected by fuses, preferably High Rupture Current (HRC) motor rated types
(EN60269) or miniature circuit breakers (EN60898) or local codes having similar time lag characteristics, that allow starting of the
compressor yet still afford close overcurrent protection under running conditions. The ratings below are for HRC motor rated fuses.
SYSTEMS WITH 3 Ph 400V 50Hz OUTDOOR UNITS (A/Ph)
MCU+
180
200
25
32
INSTALLATION of 550 Series CONDENSING UNITS
MCU+ = standard condensing unit + FSC + LP
The installer will require:
2 open ended spanners for securing the flare fittings
A 4 or 5mm Allen Key for the valves (dependant on valve type).
Note: It is easier to fit kits prior to mounting the unit.
These units are designed to stand on a flat surface. If the unit is to be wall mounted the following kits are available.
(TEV cannot accept liability for installers own mounting arrangements).
Whether floor or wall mounted, it is essential that the mounting surface is capable of supporting the unit weight.
Leave space around the unit for air circulation and access for installation and maintenance.
MOUNTING: MCU+ 180 - 200
Model
MCU+ 180 - 200
Mounting Bracket Kit
55021101
B
60
A10
CDE
MOUNTING HOLES
417
397
425
1500 min air off
100 min 100 min
600 min

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All dimensions are in millimetres.
Model
A
B
C
D
E
Weight
(kg)
MCU+ 180
1100
1215
675
211
95
118
MCU+ 200
1100
1215
675
211
95
173
APPLICATION - ALL CONDENSING UNITS
1. To maximise performance, pipe runs should be kept as short as possible, avoiding sharp bends. However, individual
pipe runs to a maximum of 45m, including 20m lift, are permissible provided good refrigeration practice is followed.
Published performance duties are based on 7.5m pipe runs. Correctly sized pipes for each installation, and fitting the
correct thermal expansion valve will result in no significant loss of capacity on extended pipe runs.
a) Pipe sizes are based on:-
Minimum of 3.8 m/s (750 fpm) suction gas velocity for horizontal or downflow.
Minimum of 7.6 m/s (1500 fpm) suction gas velocity for upflow.
Maximum of 15.2 m/s (3000 fpm) suction gas.
b) Where vertical risers exceed 3m, oil traps must be formed in the pipe. This will help ensure that oil returns to
the compressor. Typically fit an oil trap every 3m with a trap at the bottom of the riser.
2. The maximum pipe lengths to be used for each pipe size and outdoor unit are shown in the table opposite. Use of
these sizes and lengths is recommended in order to achieve optimum system performance
SUCTION LINE SIZE
LIQUID LINE SIZE
MCU+
0 - 6M
6 - 15M
15 - 21M
21 - 45M
0 - 21M
21 - 45M
180 - 200
7/8
1 - 1/8
1 - 1/8
1 - 3/8
1/2
5/8
3. In calculating equivalent lengths of pipe runs, the effect of bends and fittings must be taken into account. Information
relating to the equivalent lengths of line fittings and bends etc is generally available to the design engineer. The table
below covers the fittings most likely to be encountered in this type of installation. The equivalent lengths of all the
fittings in a particular pipe run must be added together and the total added to the actual length of pipe in the run, in
order to calculate its total equivalent length.
FITTING
PIPE SIZE (OUTSIDE DIAMETER IN INCHES)
3/8
1/2
5/8
3/4
7/8
1 - 1/8
45° BEND
0.12
0.15
0.18
0.21
0.24
0.3
90° BEND R/D = 1
0.37
0.43
0.49
0.55
0.61
0.79
90° BEND R/D = 2
0.24
0.27
0.30
0.37
0.43
0.52
180° BEND C/D = 1
0.73
0.91
1.10
1.28
1.46
1.83
180° BEND C/D = 2
0.46
0.55
0.64
0.76
0.85
1.07
90° ELBOW
0.67
0.85
1.04
1.25
1.46
1.89
R = RADIUS OF BEND D = DIAMETER OF TUBE C = CENTRES OF BEND
4. Use the shortest possible route, avoiding sharp bends.
5. Fully insulate the suction line, (or suction and liquid line if run together).

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PIPE CONNECTIONS/RESTRICTORS
1. Outdoor units are supplied with the following brazed connections (sizes in inches);
Model
Size
MCU+
180 - 200
Expansion
1/2
Suction
7/8
NOTE: Ensure that both service valves on the outdoor unit are closed (IN, fully clockwise) before commencing installation.
Indoor units have a low pressure holding charge of nitrogen, which may be released into the atmosphere without damage to the
environment. This should be done prior to making pipework connections.
2. Intdoor units are delivered with thermal expansion valve fitted.
ELECTRICAL CONNECTIONS
Mains, control and interconnecting cables must be supplied and fitted by the installer.
Installer wiring must be carried out in accordance with local and national codes.
Mains supply cables must be size compatible with the recommended fuse for a given system).
An all pole isolator switch should be positioned within easy reach of the indoor unit.
The equipment must be earthed.
Cable clamps for use with stranded cables should be used to secure all incoming/outgoing cables.
Installers must supply a method of securing any solid sheathed cables.
Systems require a supply to the outdoor/ducted unit with connecting cables run to the indoor unit.
SCROLL COMPRESSOR ROTATION
On 3 Phase units it is possible for the scroll compressor to run backwards. This becomes obvious on start up; the compressor will not
develop a normal running pressure differential and the top will not become warm. It may be excessively noisy. If this happens, switch off
the mains power and exchange any two of the phases supplying the unit. This will correct the rotation of the compressor.
OUTDOOR UNIT WIRING
Cable entry for the outdoor unit electrics is through the cabinet access panel to a terminal block.
MCU+ units are supplied wired via a head pressure controller to give maximum control. Ensure that all connections are secure and that
both units are earthed.
DATA PLATES
Because of the ability to mix-match indoor and outdoor units, the data plate only gives information on outdoor units. To obtain the
system details, input power and currents from indoor and outdoor units should be added together. Data plates show basic units with
electric heater kit loads shown separately.
EVACUATING
Connect a vacuum pump to the service ports on the outdoor unit valves and evacuate the interconnecting pipework and indoor unit to
1000 microns (1 Torr) or better and allow to be held for a minimum of 15 minutes.

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ADDING REFRIGERANT
1. After evacuating the indoor unit and interconnecting pipework, open the valves using a 4 or 5mm Allen key. The high and low side
pressures should equalise within a minute.
2. Additional charge for all systems, including heat pumps, should be introduced with the system in the AIR CONDITIONING MODE.
3. If a manual HP cutout is fitted, ensure that the reset button is depressed.
4. A random start delay of up to 1 minute occurs when mains is first applied. A 3 minute delay occurs between successive compressor
operations on all systems.
5. Additional charge should be introduced through the Schrader valve on the indoor unit or the service port on the suction service valve
on the outdoor unit (see charging section below to calculate the weight).
6. MCU outdoor units should have a speed appropriate to their expected operating ambient.
7. Ensure that the refrigerant being added is the same refrigerant that the system was factory charged with.
8. Run the system for a few minutes to allow it to stabilize.
9. System to be charged to fitted sight glass.
10. HEAD PRESSURE CONTROL SAGINOMIYA (RGE –ZIN4 –SH)
The head pressure controller is factory set to suit the refrigerant. It may be necessary to adjust this to suit site
conditions, to raise or lower the nominal head pressure.
a. With the system switched off, connect a high pressure gauge to the liquid line service valve.
b. Switch on the system, indoor fan set to high speed, and run for a few minutes to stabilise.
c. The head pressure should be approximately:
Electricsbox
Headpressure
adjustmentscrew
Fancapacitor
R134A: 140 –145 psig (9.7 –10 barg) at 32°C ambient temperature, 250 –260 psig (17.2 –17.9 barg) at 55°C
ambient temperature to achieve this adjust the screw clockwise to increase pressure or anticlockwise to decrease.
Each ½ turn will alter the pressure by approx 5 psig (0.5 barg)
Min fan speed (0 rpm) and fan cut in pressure 200 psig (13.8 barg) are factory set and not adjustable.
NOTE: The condenser fan may stop if the operating pressure drops below 200 psig (13.8 barg)
11. HEAD PRESSURE CONTROL ALCO (FSY-42S) & SAGINOMIYA (XGE-4C)
The head pressure controller is factory set to suit the refrigerant. It may be necessary to adjust this to suit site conditions, to
raise or lower the nominal head pressure.
ALCO (FSY-42S)
a. With the system switched off, connect a high pressure gauge to the liquid line service valve.
b. Switch on the system, and run for a few minutes to stabilise.
c. The head pressure should be approximately:
Min fan speed (0 rpm) and fan cut in pressure 200 psig (13.8 barg) are factory set and not adjustable.

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NOTE: The condenser fan may stop if the operating pressure drops below 200 psig (13.8 barg)
R134A: 140 –145 psig (9.7 –10 barg) at 32°C ambient temperature, 250 –260 psig (17.2 –17.9 barg) at 55°C
ambient temperature to achieve this adjust the screw clockwise to increase pressure or anticlockwise to decrease.
Each ½ turn will alter the pressure by approx 5 psig (0.5 barg)
Pressure changes per turn of adjusting screw:
Pressure change: 9.2 … 21.2 bar:
Clockwise ~ +2,5 bar, counter clockwise ~ -2,5 bar
After adjustment, re-insert sealing plug and make sure that it is properly fitted. IP65 protection
requires firmly sealed plug
NOTES:
Tolerances for condensing temperatures setpoint: ±2K
SAGINOMIYA (XGE-4C)
R134A: 140 –145 psig (9.7 –10 barg) at 32°C ambient temperature, 250 –260 psig (17.2 –17.9 barg) at 55°C
ambient temperature to achieve this adjust the screw clockwise to increase pressure or anticlockwise to decrease.
Each ½ turn will alter the pressure by approx 5 psig (0.5 barg)
Pressure changes per 1 turn of adjusting screw:Pressure change: 10 … 25bar:
Clockwise ~ +1.5 bar, counter clockwise ~ -1.5 bar
WHEN INSTALLATION HAS BEEN COMPLETED - CHECK:-
1.All pipe work and joints for leakage.
2.All pipe work and fittings for insulation.
3.All bolts are secure and that the fan rotates freely

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MCU+ 180 COMPONENT IDENTIFICATION
TEV LTD,ARMYTAGE ROAD, BRIGHOUSE, WESTYORKSHIRE, HD6 1QF. TEL: + 44 (0) 1484 405600 FAX: [phone]
EMAIL: [e-mail] WEB: www.marstair.com
1
Lid
13
Rear access panel
25
Handle
2
Fuse terminal
14
Bulkhead panel
26
Front access panel
3
Fuse
15
HP switch (manual: Accessory)
27
Fan guard
4
Terminal (screw - screw)
16
Reversing valve (MHPUE)
28
Fascia panel
5
Terminal (4 way)
17
29
Corner panel
6
Contactor
18
Service valve (expansion)
30
Support bracket
7
Earth terminal
19
Service valve (suction)
31
Fan motor assembly
8
End clamp
20
Valve panel
32
Head pressure control pcb
9
Overload
21
Base
33
Power board (MHPUE)
10
Heat exchanger
22
Mounting foot
34
3 minute timer pcb
11
Fan capacitor
23
LP switch
35
Compressor capacitor (1Ph)
12
Mains terminal cover
24
Compressor
36
Electrics box