Marstair WM User manual

-1-
`
TECHNICAL MANUAL
WM: REMOTE WIRED HIGH WALL SPLIT SYSTEMS
WM L, WM E: INFRARED HIGH WALL SPLIT SYSTEMS
INDOOR UNIT: 556 series WM, WM L, or WM E
MATCHED WITH: 550 series MCU or MCU+ condensing units (MCUP=MCU+ in Germany)
551 series MHPUE or MHPUL heat pump units
542 series DCUE ducted condensing units
543 series DHPUE ducted heat pump unit
GENERAL Part numbers 2
Dimensions and weights 3
Unit combinations, features/accessories 4
Essential Range systems 4
PRODUCT Optional electric heating 5
SELECTION Airflows, air throws5
Sound power and pressure levels 6
Performance data 7
Electrical data 8
Fuses9
INSTALLATION WM (L) (E) unpacking 14
Removing the case 14
Hanging the unit 15
Pipework and restrictors 16
Gravity drain; cable routing 17
Fitting the case 17
Fitting filters
MCU, MCU+, MHPUL, MHPUE installation 18
DCUE, DHPUE installation 19
Pipe sizing 20
Interconnecting wiring 22
WML pcb jumper configuration 23
Remote controller WM(RCC 30: including operation) 24
WM L 25
WM E 25
Evacuating and charging 26
Adding refrigerant and oil 27
Check list: filter maintenance 28
WIRING WM, WM L, WM E 29
DIAGRAMS MCU, MCU+, MHPUL, MHPUE 32
DCUE, DHPUE 35
Interconnecting diagrams 38
WM (L) (E) KITS Remote return air sensor (for WM RCC30 controller) 41
Programmable timer (for WM) 41
Electric heaters 42
5m high condensate pump 44
EMC termination kit 46
BMS alarm interface kit 47
OPERATING Infrared WM L 48
INSTRUCTIONS Infrared WM E 50
COMPONENT Exploded view of chassis with component identification 54
IDENTIFICATION Exploded view of case 55
Outdoor units 56
Ducted units 57
FAULT FINDING All models 58
Marstair Ltd,
Armytage Road, Brighouse,
West Yorkshire, HD6 1QF, UK. 55699105-03
Tel: [phone]
Fax: [phone]
Email: [email protected]

-2-
MARSTAIR LIMITED - WM HIGH WALL SPLIT SYSTEMS
The WM range of split systems consists of WM high wall units using remote wired controllers and WM L and WM E high
wall units using infrared controllers matched with 550 series condensing units, 551 series heat pump outdoor units, 542
series electronic ducted condensing units or 543 series ducted heat pumps.
By choosing appropriate combinations, the installer can provide:
AIR CONDITIONERS with a cooling range of 3.7-8.2 kW,
or HEAT PUMPS with a cooling range of 3.7-8.2 kW, and a heating range of 4.2 -9.1 kW (7°C outdoors)
PART NUMBERS
WM (L)(E) INDOOR UNITS
Cool only Cool and heat
WM WM 60 WM 80 WM 100 WM 60 WM 80 WM 100
55600001 55600002 55600003 Electric heaters available as an option
WM L WM L 60 WM L 80 WM L100 WM L 60 WM L 80 WM L100
55600004 55600005 55600006 55600010 55600011 55600012
WM E WM E 60 WM E 80 WME 100 WM E 60 WM E 80 WME 100
55600007 55600008 55600009 55600013 55600014 55600015
550 Series CONDENSING UNITS (MCU/MCU+)
MCU 1Ph MCU 50 MCU 60 MCU 80 MCU90
R22 55022070 55022071 55022072 55022073
MCU 3Ph MCU 50 MCU 60 MCU 80 MCU90 MCU 100
R22 55022076 55022077 55022078 55022079 55022080
MCU+ 1Ph MCU+50 MCU+60 MCU+80 MCU+90
R407C 55022006 55022007 55022008 55022009
R22 55022028 55022029 55022030 55022031
MCU+ 3Ph MCU+50 MCU+60 MCU+80 MCU+90 MCU+100
R407C 55022013 55022014 55022015 55022016 55022017
R22 55022034 55022035 55022036 55022037 55022038
551 Series HEAT PUMP UNITS (MHPUL) 551 Series HEAT PUMP UNITS (MHPUE)
MHPUL 1Ph MHPUL 50 MHPUL 80 MHPUL 90 MHPUE 1Ph MHPUE 50 MHPUE 80 MHPUE 90
R407C 55122044 55122046 55122047 R407C 55122005 55122007 55122008
R22 55122062 55122064 55122065 R22 55122023 55122025 55122026
MHPUL 3Ph MHPUL 50 MHPUL 80 MHPUL 90 MHPUE 3Ph MHPUE 50 MHPUE 80 MHPUE 90
R407C 55122050 55122052 55122053 R407C 55122011 55122013 55122014
R22 55122068 55122070 55122071 R22 55122029 55122031 55122032
542 Series DUCTED CONDENSING UNITS (DCUE) 543 Series DUCTED HEAT PUMP UNIT(DHPUE)
DCUE 1Ph DCUE 50 DCUE 60 DCUE 80 DHPUE 1Ph DHPUE 50
R407C 54200031 54200032 54200033 R407C 54300018
R22 54200006 54200007 54200008 R22 54300004
DCUE 3Ph DCUE 50 DCUE 60 DCUE 80 DHPUE 3Ph DHPUE 50
R407C 54200037 54200038 54200039 R407C 54300021
R22 54200017 54200018 54200019 R22 54300007

-3-
UNPACKED DIMENSIONS AND WEIGHTS
Model
WM (L) (E)
60 80 100
HEIGHT mm 350 350 350
WIDTH mm 1200 1500 1800
DEPTH mm 223 223 223
WEIGHT kg 19 23 27
CONDENSING UNITS
Model MCU(+)50 MCU (+) 60 MCU (+) 80 MCU (+) 90 MCU (+) 100
HEIGHT mm 720 720 720 820 820
WIDTH mm 1000 1000 1000 1000 1000
DEPTH* mm 300 300 300 350 350
WEIGHT
kg 1 Ph 64 65 66 76 -
3 Ph 62 63 64 73 81
* excluding 10mm grille
HEAT PUMP OUTDOOR UNITS
Model MHPUL(E) 50 MHPUL(E) 80 MHPUL(E) 90
HEIGHT mm 720 820 820
WIDTH mm 1000 1000 1000
DEPTH* mm 300 350 350
WEIGHT
kg 1 Ph 64 75 77
3 Ph 62 72 75
* excluding 10mm grille
DUCTED CONDENSING UNITS DUCTED HEAT PUMP
Model DCUE 50 DCUE 60 DCUE 80 Model DHPUE 50
HEIGHT mm 625 625 625 HEIGHT mm 625
WIDTH mm 1245 1245 1245 WIDTH mm 1245
DEPTH mm 565 565 565 DEPTH mm 565
WEIGHT 1 Ph 81 81 84 WEIGHT kg 95
PACKED DIMENSIONS AND WEIGHTS
Model
WM (L) (E)
60 80 100
HEIGHT mm 345 345 345
WIDTH mm 1350 1650 1950
DEPTH mm 480 480 480
WEIGHT kg 23 28 33
CONDENSING UNITS
Model MCU(+)50 MCU (+) 60 MCU (+) 80 MCU (+) 90 MCU (+) 100
HEIGHT mm 720 720 725 825 825
WIDTH mm 1080 1080 1080 1090 1090
DEPTH mm 340 340 340 390 390
WEIGHT
kg 1 Ph 66 67 67 78 -
3 Ph 64 65 65 75 83
HEAT PUMP OUTDOOR UNITS
Model MHPUL(E) 50 MHPUL(E) 80 MHPUL(E) 90
HEIGHT mm 720 825 1085
WIDTH mm 1080 1090 1090
DEPTH mm 340 390 465
WEIGHT
kg 1 Ph 66 77 -
3 Ph 64 74 105

-4-
DUCTED CONDENSING UNITS DUCTED HEAT PUMP
Model DCUE 50 DCUE 60 DCUE 80 Model DHPUE 50
HEIGHT mm 660 660 660 HEIGHT mm 700
WIDTH mm 1270 1270 1270 WIDTH mm 1270
DEPTH mm 610 610 610 DEPTH mm 610
WEIGHT 1 Ph 86 86 90 WEIGHT kg 101
UNIT COMBINATIONS
Combinations of indoor unit and (ducted) condensing/heat pump unit can be chosen to give either air conditioning or heat
pump systems.
Air Conditioners Heat Pumps
WM MCU(+) DCUE WM L MHPUL
60 50 50 60 50
60 60 60 80 80
80 80 80 100 90
80 90 -
100 90 - WM E MHPUE DHPUE
100 100 - 60 50 50
80 80 -
100 90 -
FEATURES/ACCESSORIES
INDOOR UNITS WM WM L WM E
Top air discharge STD STD STD
Adjustable air deflection STD STD STD
Long life washable filter STD STD STD
3 fan speeds STD STD STD
De-ice thermostat STD STD STD
Electric heating ***
Remote hard wired control STD --- *
Remote temperature sensor *--- ---
Programmable timer *--- ---
Remote infrared control --- **
Gravity drain STD STD STD
5m high condensate pump ***
OUTDOOR UNITS MCU MCU+ MHPUL MHPUE DCUE DHPUE
Fan speed head pressure control *STD STD STD STD STD
HP cutout auto (with manual backup) --- --- --- STD STD STD
HP cutout auto --- STD --- --- --- ---
HP cutout manual ***--- --- ---
LP cutout auto *STD STD STD STD STD
3 minute start time delay *STD STD STD STD STD
Low ambient start *STD STD STD STD STD
Random start *STD STD STD STD STD
Volt free relay (for remote alarm) ****--- ---
Contactor STD STD STD STD STD STD
Overload 1Ph (standard on 3Ph) ******
Isolator (for remote mounting) ******
Isolator mounted on unit --- --- --- --- **
Wall mounting brackets ******
Heat pump condensate drain tray --- --- **--- *
Ducting kits --- --- --- --- **
Compressor jacket ****--- ---
STD = Standard *= site accessory ---- = not available

-5-
OPTIONAL ELECTRIC HEATING (kW)
WM (L) (E) 230V 50Hz 240V 50Hz
60 1.2 1.3
80 1.7 1.8
100 2.1 2.3
AIRFLOWS
WM (L) (E) LOW SPEED MEDIUM SPEED HIGH SPEED
m3/s m3/s m3/s
60 0.17 0.19 0.28
80 0.24 0.31 0.37
100 0.25 0.34 0.49
AIR THROWS
--o--o--O--O--O--o--o--

-6-
SOUND POWER and SOUND PRESSURE LEVELS
556 SERIES WM (L) (E)
SOUND POWER LEVELS
SOUND PRESSURE LEVELSFrequency Hz
MODEL SPEED 125 250 500 1K 2K 4K dBA dBA NC
60
MIN 36.8 37 39.1 38.8 34.4 31.7 43 25 19
MED 41.0 43.4 45.8 45.1 39.6 35.4 49 31 25
MAX 46.7 48.6 50.6 50.4 46.6 39.0 54 37 31
80
MIN 39.1 44.3 47.2 46.8 41.6 40.8 51 33 27
MED 43.8 49.1 51.3 51.3 46.7 39.5 55 37 32
MAX 45.5 50.5 53.7 52.9 48.7 40.8 57 39 34
100
MIN 34.1 38.0 44.0 42.3 41.0 38.0 48 30 24
MED 42.7 45.8 48.9 49.1 44.2 38.1 53 35 30
MAX 46.4 51.6 54.2 54.2 49.9 42.9 57 40 35
Sound Power Levels obtained in conformance with BS 4196: Part 5: 1981. Values 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 results measured in anechoic conditions.
Values relate to a position 3m away from the centre line of the unit, 1m down.
550/551 SERIES MCU, MCU+ MHPUL MHPUE
MAXIMUM SPEED SOUND POWER LEVELS SOUND PRESSURE LEVELS
Frequency Hz
MCU(+) MHPUL(E) 125 250 500 1K 2K 4K dBA dBA NC
50 50 73.6 68.2 67.1 65.5 61.1 53.4 70 49 44
60 - 72.9 67.7 67.8 66.4 61.9 54.1 70 50 45
80 - 70.9 68.6 68.1 65.3 59.5 53.8 70 49 43
- 80 75.4 72.9 69.1 68.8 62.6 56.6 72 52 47
90 90 81.8 71.8 69.2 68.6 63.1 57.4 73 52 47
100 - 79.4 73.7 71.5 68.5 63.8 58.1 73 53 47
MINIMUM SPEED SOUND POWER LEVELS SOUND PRESSURE LEVELS
Frequency Hz
MCU(+) MHPUL(E) 125 250 500 1K 2K 4K dBA dBA NC
50 50 67.4 64.1 66.0 63.6 58.7 51.8 68 47 42
60 - 67.4 64.3 67.1 66.8 60.7 51.7 70 49 45
80 - 69.4 66.5 66.9 62.1 56.1 51.6 68 47 41
- 80 67.5 63.4 64.4 64.2 57.4 51.0 67 47 43
90 90 79.0 65.4 64.9 61.5 58.5 53.7 68 47 40
100 - 75.3 69.4 70.9 63.7 59.7 53.6 70 50 46
Sound Power Levels obtained in conformance with ISO 3741: 1988. Values are dB with a standard reference of 1 pW.
Sound Pressure Levels are dB relative to 2 x 10-5N/m2and are calculated from results measured in anechoic conditions.
Values relate to a position 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).
SOUND PRESSURE LEVELS - DUCTED CONDENSING UNITS
Measurement Point Unit Fan Speed dBA NC
3m from unit in void DCUE 50, 60, 80
DHPUE 50
Max 54 48
Min 44 31
Adjacent office area DCUE 50, 60, 80
DHPUE 50
Max 42 28
Min 32 17
3m from discharge grille DCUE 50, 60, 80
DHPUE 50
Max 52 44
Min 40 28
All readings taken from a typical application of a unit suspended in a ceiling void complete with 5m of insulated
ducting, conditioning an office directly below. Sound Pressure Levels are dB relative to 2x10-5N/m2.

-7-
AIR CONDITIONER PERFORMANCE DATA (kW)
UK Conditions: Room 21/C / 15/C Ambient 27/C /19/C
Low Medium High
WM
WM L
WM E
MCU
MCU+
MCUP
DCUE
TOT SHR SENS TOT SHR SENS TOT SHR SENS
60 50 4.60.673.1 4.70.683.2 5.10.733.7
60 60 4.90.653.2 5.00.683.4 5.50.713.9
80 80 6.20.684.2 6.50.714.6 6.70.734.9
80 90 6.70.674.5 7.20.684.9 7.50.715.3
10090 7.10.664.7 7.70.695.3 8.30.756.2
100 100 7.4 0.66 4.9 8.2 0.68 5.6 8.9 0.73 6.5
NEMA Conditions: Room 27/C / 19/C Ambient 35/C / 24/C (EUROVENT rating)
Low Medium High
WM
WM L
WM E
MCU
MCU+
MCUP
DCUE
TOT SHR SENS TOT SHR SENS TOT SHR SENS
60 50 4.90.653.2 5.10.673.4 5.40.744.0
60 60 5.30.643.4 5.40.673.6 5.90.714.2
80 80 6.60.674.4 6.90.714.9 7.00.765.3
80 90 7.30.644.7 7.80.685.3 8.00.715.7
10090 7.70.655.0 8.30.695.7 8.70.776.7
100 100 8.3 0.64 5.3 9.0 0.67 6.0 9.7 0.73 7.1
HEAT PUMP PERFORMANCE DATA (kW)
a. Cooling (Max. speed outdoor unit fan)
UK Conditions: Room 21/C / 15/C Ambient 27/C /19/C
Low Medium High
WM
WM L
WM E
MHPUL
MHPUE
DHPUE TOT SHR SENS TOT SHR SENS TOT SHR SENS
60 50 3.70.732.7 3.80.762.9 4.40.773.4
80 80 5.20.713.7 5.70.754.3 6.10.794.8
10090 7.20.725.2 7.40.745.5 7.80.765.9
NEMA Conditions: Room 27/C / 19/C Ambient 35/C /24 /C (EUROVENT rating)
Low Medium High
WM
WM L
WM E
MHPUL
MHPUE
DHPUE TOT SHR SENS TOT SHR SENS TOT SHR SENS
60 50 4.00.753.0 4.10.783.2 4.80.773.7
80 80 5.50.734.0 6.40.785.0 6.80.845.7
10090 7.80.725.6 8.00.766.1 8.20.796.5
b. Heating (Max. speed outdoor unit fan)
Room 20/C/12/C Ambient 7/C
(Eurovent rating) Room 20/C/12/C Ambient -1/C
Low Medium High Low Medium High
WM
WM L
WM E
MHPUL
MHPUE
DHPUE kW COP kW COP kW COP kW COP kW COP kW COP
60 50 4.2 1.64 4.4 1.84 5.1 2.32 3.2 1.58 3.4 1.71 3.7 1.95
80 80 5.6 1.77 6.1 2.1 6.6 2.28 4.4 1.5 5.1 1.96 5.5 2.11
100 90 7.0 2.17 8.4 2.7 9.1 3.25 5.8 2.2 6.5 2.38 7.0 2.70

-8-
ELECTRICAL LOADS: Amps (230V 50Hz 1Ph) or A/Ph (400V 50Hz 3PhN)
WM (L) (E) 60 80 100
Fan Motor 0.4 0.4 0.5
Electric heater 5.2 7.2 9.2
MCU / MCU+ / MCUP MHPUL / MHPUE DCUE DHPUE
50 60 80 90 100 50 80 90 50 60 80 50
Fan motor 0.6 0.6 0.6 1.0 1.0 0.6 1.0 1.0 2.6 2.6 2.6 2.6
Compressor
nominal FLA
R407C 1Ph 8.3 10.2 10.9 15.0 - 8.3 10.9 15.0 10.5 11.8 14.8 10.5
R407C 3Ph 3.5 3.6 4.3 5.8 6.9 3.5 4.3 5.8 4.1 4.3 4.8 4.1
R22 1Ph 7.9 9.7 10.4 14.3 - 7.9 10.4 14.3 10.0 11.0 14.1 10.0
R22 3Ph 3.4 3.5 3.9 5.5 6.6 3.4 3.9 5.5 4.0 4.1 4.6 4.0
Crankcase heater ----- ---0.250.250.250.25

-9-
FUSES / DISJONCTEURS / SICHERUNGEN (EN60269) - MCBs (EN60898)
1Ø - 230 V R407C / R22
FUSE RATING (A) / TAILLE DES DISJONCTEURS (A) / EMPFOHLENE SICHERUNG (A) (HRC Type)
MCU
MCU+
MCUP
WM (L) (E)
DCUE
WM (L) (E)
60 80 100 60 80 100
SHSHSH SHSHSH
501616---- 502525----
602020---- 602525----
80 - - 25 25 - - 80 - - 32 32 - -
90 - - 32 32 32 32
MHPUL
MHPUE
WM L (E)
DHPUE
WM E
60 80 100 60 80 100
SHSHSH SHSHSH
501625---- 502532----
80 - - 25 32 - -
90----3250(40)**R407C (R22)
S = No Electric Heating / Sans Batterie Electrique / Ohne Elektroheizung
H = + Electric Heaters / + Batterie Electrique / Mit Elektroheizung
H= 1.2 kW {WM 60 (L) (E)}, H = 1.7 kW {WM 80 (L) (E)}, H = 2.1 kW {WM100 (L) (E)}, @ 230V
3Ø - 400 V R407C / R22
FUSE RATING (A/Ø) / TAILLE DES DISJONCTEURS (A/Ph) / EMPFOHLENE SICHERUNG (A/Ph)
(HRC Type)
MCU
MCU+
MCUP
WM (L) (E)
DCUE
WM (L) (E)
60 80 100 60 80 100
SHSHSH SHSHSH
501616---- 501010----
601616---- 601616----
80 - - 16 16 - - 80 - - 20 20 - -
90 - - 16 16 16 16
100----1616
MHPUL
MHPUE
WM L (E)
DHPUE
WM E
60 80 100 60 80 100
SHSHSH SHSHSH
501616---- 501616----
80 --1620- -
90----1625
S = No Electric Heating / Sans Batterie Electrique / Ohne Elektroheizung
H = + Electric Heaters / + Batterie Electrique / Mit Elektroheizung
H= 1.2 kW {WM 60 (L) (E)}, H = 1.7 kW {WM 80 (L) (E)}, H = 2.1 kW {WM100 (L) (E)}, @ 230V
DCUE / MHPUE / DHPUE - WITH SEPARATE SUPPLIES
- AVEC ALIMENTATION SÉPARÉE
- MIT GETRENNTEN STROMVERSORGUNGEN
FUSE RATING / TAILLE DES DISJONCTEURS / EMPFOHLENE SICHERUNG (A, A/Ph)
INDOOR UNITS / INTÉRIEUR / INNERGERÄTE OUTDOOR UNITS / EXTÉRIEUR / AUSENGERÄTE
WM E S H Unit size 50 60 80 90
60 E 5 10 DCUE 1Ph A 25 25 32 -
80 E 5 10 MHPUE 1Ph A 16 - 25 32
100 E 5 16 DHPUE 1Ph A 25 - - -
DCUE 3Ph A/Ph 10 16 16 -
MHPUE 3Ph A/Ph 10 - 16 16
DHPUE 3Ph A/Ph 10 - - -
S = No Electric Heating / Sans Batterie Electrique / Ohne Elektroheizung
H = + Electric Heaters / + Batterie Electrique / Mit Elektroheizung
H= 1.2 kW (WM 60E), H = 1.7 kW (WM 80E), H = 2.1 kW (WM100 E), @ 230V

-10-
ELECTRICAL DATA ~ R407C ( maximum indoor unit fan speed)
a) R407C: WM + MCU / MCU+ /MCUP
COOLING
27/C/19/C, 35//24/C1Ph 230V 50Hz 3Ph 400V 50Hz
INPUT FULL LOAD
CURRENT
SYSTEM MAX.
STARTING
CURRENT INPUT FULL LOAD
AMPS
SYSTEM MAX.
STARTING
CURRENT
WM MCU(+) kW AMPS AMPS kW A/PH A/PH
60 50 2.0 9.3 59 2.0 4.5 27
60 60 2.4 11.2 62 2.4 4.6 33
80 80 3.0 11.9 77 3.0 5.3 41
80 90 3.6 16.4 97 3.5 7.2 46
100 90 3.6 16.5 97 3.5 7.3 46
100 100 - - - 3.7 8.4 52
HEATING (230V 50Hz)
20/C/12/C, 7/C/6/C
WM MCU MCU+ MCUP kW AMPS
60 ALL 1.2 5.2
80 ALL 1.7 7.2
100 ALL 2.1 9.2
b) R407C: WM (L) (E) + DCUE
COOLING
27/C/19/C, 35//24/C1Ph 230V 50Hz 3Ph 400V 50Hz
INPUT FULL LOAD
CURRENT
SYSTEM MAX.
STARTING
CURRENT INPUT FULL LOAD
AMPS
SYSTEM MAX.
STARTING
CURRENT
WM (L) (E) DCUE kW AMPS AMPS kW A/PH A/PH
60 50 2.5 13.8 60 2.5 7.4 24
60 60 2.9 15.1 70 2.9 7.6 24
80 80 3.3 18.1 79 3.3 8.1 27
HEATING (230V 50Hz)
20/C/12/C, 7/C/6/C
WM (L) (E) DCUE kW AMPS
60 ALL 1.2 5.2
80 ALL 1.7 7.2
100 ALL 2.1 9.2
c) R407C: WM (L) (E) + MHPUL / MHPUE
COOLING
27/C/19/C, 35//24/C1Ph 230V 50Hz 3Ph 400V 50Hz
INPUT FULL LOAD
AMPS
SYSTEM
MAX.
STARTING
CURRENT
INPUT FULL LOAD
AMPS
SYSTEM
MAX.
STARTING
CURRENT
WM (L) (E) MHPUL (E) kW AMPS AMPS kW A/PH A/PH
60 50 2.0 9.3 59 2.0 4.5 27
80 80 3.0 12.3 77 2.9 5.7 41
100 90 3.6 16.5 97 3.5 7.3 46
HEATING
(230V 50Hz)
20/C/12/C, 7/C/6/C
1Ph 230V 50Hz 3Ph 400V 50Hz
INPUT FULL LOAD
AMPS
SYSTEM
MAX.
STARTING
CURRENT
INPUT FULL LOAD
AMPS
SYSTEM
MAX.
STARTING
CURRENT
kW AMPS AMPS kW A/PH A/PH
WM (L) (E) MHPUL (E) S H S H S H S H
60 50 2.2 3.4 9.3 14.5 64 2.2 3.4 4.5 9.7 32
80 80 2.9 4.6 12.3 19.5 84 2.9 4.6 5.7 12.9 48
100 90 2.8 4.9 16.5 25.7 106 2.8 4.9 7.3 16.5 54
S = standard unit (no heaters) H = + Electric heaters

-11-
d) R407C: WM (L) (E) + DHPUE
COOLING
27/C/19/C, 35//24/C1Ph 230V 50Hz 3Ph 400V 50Hz
INPUT FULL LOAD
CURRENT
SYSTEM MAX.
STARTING
CURRENT INPUT FULL LOAD
AMPS
SYSTEM
MAX.
STARTING
CURRENT
WM (L) (E) DHPUE kW AMPS AMPS kW A/PH A/PH
60 50 2.5 13.8 60 2.5 8.1 24
HEATING
(230V 50Hz)
20/C/12/C, 7/C/6/C
1Ph 230V 50Hz 3Ph 400V 50Hz
INPUT FULL LOAD
AMPS
SYSTEM
MAX.
STARTING
CURRENT
INPUT FULL LOAD
AMPS
SYSTEM
MAX.
STARTING
CURRENT
kW AMPS AMPS kW A/PH A/PH
WM(L)(E)DHPUESHSH SHSH
60 50 2.5 3.7 13.8 19.0 66 2.5 3.7 8.1 13.3 30
S = standard unit (no heaters) H = + Electric heaters

-12-
ELECTRICAL DATA ~ R22 ( maximum indoor unit fan speed)
e) R22: WM + MCU / MCU+ /MCUP
COOLING
27/C/19/C, 35//24/C
1Ph 230V 50Hz 3Ph 400V 50Hz
INPUT FULL LOAD
CURRENT
SYSTEM MAX.
STARTING
CURRENT INPUT FULL LOAD
AMPS
SYSTEM MAX.
STARTING
CURRENT
WM MCU(+) kW AMPS AMPS kW A/PH A/PH
60 50 2.0 8.9 59 2.0 4.4 27
60 60 2.4 10.7 62 2.4 4.5 33
80 80 3.0 11.4 77 3.0 4.9 41
80 90 3.6 15.7 97 3.6 6.9 46
100 90 3.6 15.8 97 3.6 7.0 46
100 100 - - - 3.7 8.1 52
HEATING (230V 50Hz)
20/C/12/C, 7/C/6/C
WM MCU MCU+ MCUP kW AMPS
60 ALL 1.2 5.2
80 ALL 1.7 7.2
100 ALL 2.1 9.2
f) R22: WM (L) (E) + DCUE
COOLING
27/C/19/C, 35//24/C
1Ph 230V 50Hz 3Ph 400V 50Hz
INPUT FULL LOAD
CURRENT
SYSTEM MAX.
STARTING
CURRENT INPUT FULL LOAD
AMPS
SYSTEM MAX.
STARTING
CURRENT
WM (L) (E) DCUE kW AMPS AMPS kW A/PH A/PH
60 50 2.5 13.3 60 2.5 7.3 24
60 60 2.9 14.3 70 2.9 7.4 24
80 80 3.3 17.4 79 3.3 7.9 27
HEATING (230V 50Hz)
20/C/12/C, 7/C/6/C
WM DCUE kW AMPS
60 ALL 1.2 5.2
80 ALL 1.7 7.2
100 ALL 2.1 9.2
g) R22: WM (L) (E) + MHPUL / MHPUE
COOLING
27/C/19/C, 35//24/C
1Ph 230V 50Hz 3Ph 400V 50Hz
INPUT FULL LOAD
AMPS
SYSTEM
MAX.
STARTING
CURRENT
INPUT FULL LOAD
AMPS
SYSTEM
MAX.
STARTING
CURRENT
WM (L) (E) MHPUL (E) kW AMPS AMPS kW A/PH A/PH
60 50 2.0 8.9 59 2.0 4.4 27
80 80 3.0 11.8 77 3.0 5.3 41
100 90 3.6 15.8 97 3.6 7.0 46
HEATING
(230V 50Hz)
20/C/12/C, 7/C/6/C
1Ph 230V 50Hz 3Ph 400V 50Hz
INPUT FULL LOAD
AMPS
SYSTEM
MAX.
STARTING
CURRENT
INPUT FULL LOAD
AMPS
SYSTEM
MAX.
STARTING
CURRENT
kW AMPS AMPS kW A/PH A/PH
WM (L) (E) MHPUL (E) S H S H S H S H
60 50 2.2 3.4 8.9 14.1 64 2.2 3.4 4.4 9.6 32
80 80 2.9 4.6 11.8 19.0 84 2.9 4.6 5.3 12.5 48
100 90 2.8 4.9 15.8 25.0 106 2.8 4.9 7.0 16.2 54
S = standard unit (no heaters) H = + Electric heaters

-13-
h) R22: WM (L) (E) + DHPUE
COOLING
27/C/19/C, 35//24/C1Ph 230V 50Hz 3Ph 400V 50Hz
INPUT FULL LOAD
CURRENT
SYSTEM MAX.
STARTING
CURRENT INPUT FULL LOAD
AMPS
SYSTEM
MAX.
STARTING
CURRENT
WM (L) (E) DHPUE kW AMPS AMPS kW A/PH A/PH
60 50 2.5 13.3 60 2.5 7.3 24
HEATING
(230V 50Hz)
20/C/12/C, 7/C/6/C
1Ph 230V 50Hz 3Ph 400V 50Hz
INPUT FULL LOAD
AMPS
SYSTEM
MAX.
STARTING
CURRENT
INPUT FULL LOAD
AMPS
SYSTEM
MAX.
STARTING
CURRENT
kW AMPS AMPS kW A/PH A/PH
WM(L)(E)DHPUESHSH SHSH
60 50 2.5 3.7 13.3 18.5 66 2.5 3.7 7.3 12.5 30
S = standard unit (no heaters) H = + Electric heaters

-14-

-15-
INSTALLATION
HANGING RAIL
FIXING THE HANGING RAIL
HANGING THE CHASSIS

-16-
REFRIGERATION PIPEWORK / TUYAUTERIES / ROHRLEITUNGEN
MAXIMUM EQUIVALENT PIPE LENGTHS (M)
LONGUEURS EQUIVALENTES TUYAUTERIES MAXI (M)
MAXIMAL ÄQUIVALENTE ROHRLEITUNGSLÄNGEN (M)
RESTRICTOR ASSEMBLY / ASSEMBLAGE DE L’ACCURATEUR / DÜSENVORRICHTUNGEN
RESTRICTOR SIZES / NUMÉRO DES BUSES DE DÉTENTE / DÜSENGRÖßE
PIPEWORK CONNECTION / RACCORDEMENT DES TUYAUTERIES / ROHRLEITUNGEN

-17-
GRAVITY DRAIN
CABLE ROUTING
FITTING THE CASE
FITTING THE FILTERS

-18-
INSTALLATION OF 550 SERIES CONDENSING UNITS AND 551 SERIES HEAT PUMP OUTDOOR
UNITS
MCU = standard condensing unit MCU+ = standard condensing unit + FSC + LP MHPUL(E) = electronic heat pump outdoor unit
MCUP = German description for MCU+ = standard condensing unit + FSC + LP
Units are supplied with loose restrictors which may be required, depending on the indoor unit it is matched with; refer to page
16.
The installer will require:
2 flare spanners for securing the flare fittings Refrigeration quality pipework Evacuating pump
A 5 mm Allen key to open the valves. Insulation Refrigerant and polyolester oil
Kits are more easily fitted prior to mounting the unit.
Units are designed to stand on a flat surface. If the unit is to be wall mounted the following kits are available:-
(Marstair Ltd cannot accept liability for installers own mounting arrangements).
Model MCU(+) 50 - 80 / MHPUL(E) 50 MCU(+) 90 - 100 / MHPUL (E) 80 - 90
Mounting Bracket Kit 55021100 55021101
MOUNTING: MCU(+) 50 - 100 and MHPUL(E) 50 - 90
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.
All dimensions mm
MODEL ABCDE FGH
Weight (kg)
1 Ph 3
MCU(+) 50 1000 300 660 570 213 60 333 308 64 62
MCU(+) 60 1000 300 660 570 213 60 333 308 65 63
MCU(+) 80 1000 300 660 570 213 60 333 308 66 64
MCU(+) 90 1000 350 760 495 250 70 383 358 76 73
MCU(+) 100 1000 350 760 495 250 70 383 358 -- 81
MHPUE 50 1000 300 660 570 213 60 333 308 64 62
MHPUE 80 1000 350 760 495 250 70 383 358 75 72
MHPUE 90 1000 350 760 495 250 70 383 358 77 75

-19-
}foruseon1Ph systems,particularlyon longpiperuns.
542 SERIES DUCTED CONDENSING UNITS
These units have electronic fan speed control, start delay timer, HP and LP switches and a contactor fitted as
standard; stabilizing brackets are supplied loose .
It is generally preferable to fit the following kits (if applicable), prior to mounting the unit:-
i) PTC kit (Positive Temperature Coefficient resistor)
ii) CSR kit(Capacitor Start Relay).
iii) Isolator.
iv) Overload kit (single phase units only; standard on three phase units).
v) Wall mounting kit.
Consideration should be given to the following, prior to mounting, but should not be fitted until the unit is in
position:-
i) Flexible ductwork.
ii) Plenums (return/discharge).
iii) Grilles (return/discharge).
A bag containing 4 suspension brackets, 8 screws and 2 cable glands is supplied taped to the base of the unit next
to the compressor.
MOUNTING
Units are supplied with a polystyrene packing piece supporting the blower assembly, this MUST be removed prior to
commissioning.
Ducted units are designed to be hung on a wall (brackets available as a kit), suspended from a ceiling (installer
supplied fittings), or to stand on a flat surface. Whichever method is used it is essential that the mounting surface is
capable of supporting the unit's weight.
DIMENSIONS
All dimensions mm
Model A B C D E F G H J K Spigot Ø Weight (kg)
DCUE 50 1100 510 560 1174 490 65 65 240 392 865 404 81
DCUE 60 1100 510 560 1174 490 65 65 240 392 865 404 81
DCUE 80 1100 510 560 1174 490 65 65 240 392 865 404 84
DHPUE 50 1100 510 560 1174 490 65 120 240 392 865 404 95
FLOOR MOUNTING
Using the appropriate side of the packing carton as a template, (centres marked A), mark out and drill 4 holes to suit
maximum M8 bolts. Secure the unit to the floor. Discard the 4 stabilizing brackets.
A(mm) B(mm)
1100 510
Fig. 1

-20-
SUSPENSION MOUNTING
The installer must supply 4 x M8 threaded rods with 16 nuts and washers to suit.
IMPORTANT: The stabilizing brackets provided MUST be used when suspending a unit.
Fit the stabilizing brackets to the top corners of the backpanel and front face using the No. 10 screws provided, (2
per bracket).
If these brackets are omitted the unit will be subject to unacceptable movement on compressor start.
Where long drops of M8 rod are used, it is
advisable to incorporate flexible pipes in the
suction and expansion lines.
Using the template printed on the side of the
packing carton, (centres marked A), mark out
the ceiling and drill 4 holes to suit M8 screwed
rod, (see Fig. 1).
Raise the unit to the required height and pass
the screwed rods through the mounting holes in
the units feet and stabilizing brackets.
Secure the unit with a nut and washer on either
side of each stabilizing bracket and two nuts
and washers underneath each foot mounting hole,
(Fig. 2).
WALL MOUNTING
Wall mounting brackets are available as an optional kit (53200407).
DUCTWORK
Each unit is supplied with 404mm Ø (16" Ø) air inlet and discharge spigots.
These may be used for connecting installers ducting or with the optional duct, plenum and grille kits (refer to the kit
instruction for installation). The front face of the units are fitted with M6 rivnuts to accept square ducting (shown
below). Maximum flange width is 25mm and fixing holes should be central within them.
NOTE: It is essential that ducting is adequately insulated to prevent sweating.
An insulation thickness of at least 45mm is recommended.
Dimensions (mm)
A 450
B 350
C 100
PIPE SIZING
1. To maximise performance, pipe runs should be kept as short as possible, avoiding sharp bends. However,
individual pipe runs to a maximum of 80m, 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 expansion orifice (restrictor) 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. Add polyolester oil as tabled on page 27; preferably by slowly pumping into the suction side with the unit running,
after charging the system.
Fig. 2