-1-
TECHNICAL MANUAL
for IMPACT-L WALL MOUNTED
SPLIT SYSTEMS.
This manual provides technical and installation information for IMPACT-L WALL MOUNTED split systems comprising:
INDOOR UNIT 537 series IMPACT-L
MATCHED WITH 550 series MCU or MCU+ condensing units
551 series MHPUL heat pump units
542 series DCUE ducted condensing units.
INDEX PAGE
GENERAL Part numbers 2
Dimensions and weights 3 - 4
Unit features/accessories 4
SELECTION Unit combinations, performance data 5
Optional electric heating, airflows 6
Sound power and sound pressure levels 6 - 7
ELECTRICAL Electrical data, recommended fuse sizes 8 - 10
UNIT IMPACT-L, condensate removal, air deflection 11 - 12
INSTALLATION MCU(+)/MHPUL units and DCUE units 13 - 15
Pipework, restrictors 16 - 18
PCB configuration 19
Electrical connections 19
IMPACT-L remote controller mounting 20
Evacuating and charging 20 - 21
WIRING IMPACT-L units 22
DIAGRAMS MCU(+)/MHPUL 23 - 25
DCUE 25 - 26
Interconnection 27 - 31
OPERATION User maintenance 31
IMPACT-L remote controller operation 32
IMPACT-L Electric heaters 34
Condensate pump 36
FAULT All units 38
FINDING Displays, diagnostics 38
COMPONENT Exploded views of units with 40 - 42
IDENTIFICATION component identification
TEV Ltd.,
Armytage Road, Brighouse,
West Yorkshire. HD6 1QF, UK.
Tel: +44 (0) 1484 405600
Fax: +44 (0) 1484 405620
Email: sales@marstair.com 53799174-07
-2-
IMPACT-L WALL MOUNTED SPLIT SYSTEMS
The IMPACT-L WALL MOUNTED range of split systems comprises 537 series IMPACT-L wall mounted indoor units,
550 series condensing units and 551 series heat pump outdoor units, or 542 series electronic ducted condensing
units.
By choosing appropriate combinations, the installer can provide:
AIR CONDITIONERS with a cooling range of 1.65 - 9.9 kW,
or HEAT PUMP systems with a cooling ran ge of 2.0 - 8.6 kW, and a heating range of 1.9 - 9.4 kW wi th an
outdoor temperature of minus 1°C
PART NUMBERS
537 Series IMPACT-L INDOOR UNITS
Electronic IMPACT 20L IMPACT 40L IMPACT 60L IMPACT 80L IMPACT 100L
Part Number 53700064 53700065 53700066 53700067 53700068
550 Series CONDENSING UNITS (MCU/MCU+)
MCU 1Ph
Recip
MCU 15 MCU 30 MCU 40
MCU 3Ph
Recip
MCU 30 MCU 40
R407C 55022045 55022047 55022048 R407C 55022053 55022054
R22 55022151 55022153 55022154 R22 55022074 55022075
MCU 1Ph
Scroll
MCU 60 MCU 80 MCU 90
MCU 3Ph
Scroll
MCU 60 MCU 80 MCU 90 MCU 100
R407C 55022050 55022051 55022052 R407C 55022056 55022057 55022058 55022059
R22 55022071 55022072 55022073 R22 55022077 55022078 55022079
55022080
MCU+ 1Ph
Recip
MCU+ 15 MCU+ 30 MCU+ 40
MCU+ 3Ph
Recip
MCU+ 30 MCU+ 40
R407C 55022002 55022004 55022005 R407C 55022011 55022012
R22 55022155 55022157 55022158 R22 55022032 55022033
MCU+ 1Ph
Scroll
MCU+ 60 MCU+ 80 MCU+ 90
MCU+ 3Ph
Scroll
MCU+ 60 MCU+ 80 MCU+ 90 MCU+ 100
R407C 55022007 55022008 55099009 R407C 55022014 55022015 55022016 55022017
R22 55022029 55022030 55022031 R22 55022035 55022036 55022037 55022038
551 Series HEAT PUMP UNITS (MHPUL)
MHPUL 1Ph
Recip
MHPUL 15 MHPUL 30
MHPUL 3Ph
Recip
MHPUL 30
R407C 55122040 55122042 R407C 55122048
R22 55122080 55122082 R22 55122066
MHPUL 1Ph
Scroll
MHPUL 50 MHPUL 80 MHPUL 90
MHPUL 3Ph
Scroll
MHPUL 50 MHPUL 80 MHPUL 90
R407C 55122044 55122046 55122047 R407C 55122050 55122052 55122053
R22 55122062 55122064 55122065 R22 55122068 55122070 55122071
542 Series DUCTED CONDENSING UNITS (DCUE)
Electronic DCUE 1Ph DCUE 15 DCUE 30 DCUE 40 DCUE 60 DCUE 80
R22 54200002 54200004 54200005 54200007 54200008
R407C 54200027 54200029 54200030 54200032 54200033
Electronic DCUE 3Ph -- DCUE 30 DCUE 40 DCUE 60 DCUE 80
R22 -- 54200015 54200016 54200018 54200019
R407C -- 54200035 54200036 54200038 54200039
-3-
UNPACKED DIMENSIONS AND WEIGHTS
IMPACT INDOOR UNITS
Model IMPACT
20L 40L 60L 80L 100L
HEIGHT mm 490 490 490 490 490
WIDTH mm 550 850 1150 1450 1750
DEPTH mm 204 204 204 204 204
WEIGHT kg 14 20 24 30 34
CONDENSING UNITS
Model
MCU(+) 15 MCU(+) 30 MCU(+) 40 MCU(+) 60 MCU(+) 80 MCU(+) 90 MCU(+) 100
HEIGHT* mm
620 620 620 720 720 820 820
WIDTH mm
900 900 900 1000 1000 1000 1000
DEPTH mm
300 300 300 300 300 350 350
WEIGHT
kg
1 Ph 45 48 53 65 66 76 -3 Ph -- 48 53 63 64 73 81
*Includes 60mm for mounting feet.
HEAT PUMP OUTDOOR UNITS
Model MHPUL 15 MHPUL 30 MHPUL 50 MHPUL 80 MHPUL 90
HEIGHT* mm 620 620 720 820 820
WIDTH mm 900 900 1000 1000 1000
DEPTH* mm 300 300 300 350 350
WEIGHTkg1 Ph 47 50 64 75 77
3 Ph -- 50 62 72 75
*Includes 60mm for mounting feet.
DUCTED CONDENSING UNITS
Model DCUE 15 DCUE 30 DCUE 40 DCUE 60 DCUE 80
HEIGHT* mm 560 560 560 625 625
WIDTH mm 1075 1075 1075 1245 1245
DEPTH mm 565 565 565 565 565
WEIGHT kg 69 70 72 81 84
*Includes 60mm for DCUE and 115mm for DHPUE mounting feet.
PACKED DIMENSIONS AND WEIGHTS
IMPACT-L INDOOR UNITS
Model IMPACT
20L 40L 60L 80 L) 100 L
HEIGHT mm 616 616 616 616 616
WIDTH mm 720 1020 1320 1620 1920
DEPTH mm 290 290 290 290 290
WEIGHT kg 16 22 27 33 37
CONDENSING UNITS
Model
MCU(+) 15 MCU(+) 30 MCU(+) 40 MCU(+) 60 MCU(+) 80 MCU(+) 90 MCU(+) 100
HEIGHT mm
620 620 620 720 720 820 820
WIDTH mm
980 980 980 1080 1080 1090 1090
DEPTH mm
340 340 340 340 340 390 390
WEIGH
T kg
1 Ph 47 50 55 67 68 78 -3 Ph -- 50 55 65 66 75 83
-4-
HEAT PUMP OUTDOOR UNITS
Model MHPUL 15 MHPUL 30 MHPUL 50 MHPUL 80 MHPUL 90
HEIGHT mm 620 620 720 820 820
WIDTH mm 980 980 1080 1090 1090
DEPTH mm 340 340 340 390 390
WEIGHTkg1 Ph 49 52 66 77 79
3 Ph -- 52 64 74 77
DUCTED CONDENSING UNITS
Model DCUE 15 DCUE 30 DCUE 40 DCUE 60 DCUE 80
HEIGHT mm 580 580 580 650 650
WIDTH mm 1090 1090 1090 1270 1270
DEPTH mm 610 610 610 610 610
WEIGHT kg 74 76 76 86 90
FEATURES / ACCESSORIES
INDOOR UNITS
IMPACT-L
Adjustable air deflectors STD
De-ice thermostat STD
Electric heating *
3 fan speeds STD
Remote infrared control STD
Programmable timer STD
Condensate pump *
Flame retardant material STD
Long life washable filter STD
High or low level mounting STD
Key: * = factory / site option. STD = standard. --- = not available
OUTDOOR/DUCTED UNITS
MCU MCU+ MHPUL DCUE
CSR hard start (1 phase) * * * *
PTC hard start (1 phase) * * * *
Fan speed head pressure control * STD STD STD
LP cutout Auto * STD STD STD
HP cutout auto (with manual backup) * * * STD
HP cutout auto --- STD STD --HP cutout manual * * *
Isolator * * --- --3 minute start time delay * STD STD STD
Wall mounting brackets * * * *
Contactor STD STD STD STD
Overload (standard on 3Ph) * * * *
MHPUL condensate drain --- --- * --Low ambient start --- --- --- STD
Ducting kits --- --- --- *
Volt free relay * * * ---
Key: * = site option. STD = standard. --- = not available
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PRODUCT SELECTION
Combinations of indoor unit and (ducted) condensing / heat pump unit can be chosen to give either air
conditioning or heat pump systems.
UNIT COMBINATIONS
Air Conditioning Systems Heat Pump Systems
IMPACT-L MCU(+) or DCUE IMPACT-L MCU(+) or DCUE IMPACT-L MHPUL unit
20 15 20 15
40 30 40 40 40 30
60 40 60 60 60 50
80 80 80 90* 80 80
100 90* 100 100* 100 90
* Ducted unit not available at this size
AIR CONDITIONER PERFORMANCE DATA (kW)
UK CONDITIONS
ROOM 21°C/15°C
AMBIENT 27°C/19°C
NEMA (EUROVENT)
ROOM 27°C/19°C
AMB 35°C/24°C
TROPICAL
ROOM 29°C/19°C
AMB 46°C/24°C
IMPACT-L +
MCU(+) or DCUE
MIN SPEED EVAP MAX SPEED EVAP MAX SPEED EVAP MAX SPEED EVAP
TOTAL SHR SENS TOTAL SHR SENS TOTAL SHR SENS TOTAL SHR SENS
20L + 15 1.4 0.71 1.1 1.9 0.77 1.5 2.1 0.78 1.6 1.6 0.98 1.6
40L + 30 2.3 0.77 1.8 3.1 0.83 2.5 3.4 0.84 2.9 2.9 0.96 2.8
40L + 40 2.7 0.74 2.0 3.6 0.78 2.8 4.0 0.78 3.1 3.2 0.98 3.1
60L + 40 3.0 0.78 2.3 3.9 0.88 3.5 4.4 0.86 3.8 3.7 0.99 3.7
60L + 60 3.7 0.74 2.7 5.1 0.80 4.1 5.4 0.81 4.4 4.4 0.98 4.3
80L + 80 4.2 0.74 3.2 5.7 0.87 4.9 6.4 0.85 5.4 6.0 0.92 5.5
80L + 90* 5.2 0.71 3.7 6.5 0.83 5.4 8.1 0.76 6.2 7.3 0.87 6.4
100L + 90* 5.6 0.73 4.1 7.5 0.84 6.3 8.8 0.84 7.4 8.1 0.88 7.1
100L + 100* 6.5 0.73 4.8 9.3 0.77 7.2 9.9 0.76 7.5 8.7 0.87 7.6
* Ducted unit not available in this size
For MED speed duties, interpolate between MIN speed and MAX speed duties.
Rating conditions are to BS2852: Part 1: 1982: UK condition C; NEMA condition A; Tropical condition B.
HEAT PUMP PERFORMANCE DATA
a. Cooling, (MAX speed outdoor unit fan). (kW)
UK CONDITIONS NEMA (EUROVENT)
ROOM 21°C/15°C AMBIENT 27°C/19°C R27°C/19°C A35°C/24°C
MIN SPEED INDOOR FAN MAX SPEED INDOOR FAN MAX SPEED INDOOR FAN
IMPACT-L TOTAL SHR SENS TOTAL SHR SENS TOTAL SHR SENS
20L 1.2 0.75 0.9 1.7 0.81 1.4 2.0 0.78 1.6
40L 2.2 0.78 1.7 3.0 0.83 2.5 3.3 0.85 2.8
60L 3.5 0.72 2.6 4.8 0.82 3.9 5.3 0.81 4.3
80L 4.9 0.77 3.8 6.3 0.82 5.1 7.1 0.85 6.0
100L 6.1 0.73 4.4 7.9 0.79 6.3 8.6 0.83 7.2
b. Heating, (Room 20°C/12°C, outdoor unit fan at MAX speed) (kW)
HEATING OUTPUT AT 7°C AMBIENT
HEATING OUTPUT AT -1°C AMB
IENT
MAX SPEED INDOOR FAN MAX SPEED INDOOR FAN
IMPACT-L kW COP kW COP
20L 2.3 2.23 1.9 2.00
40L 4.0 2.78 3.1 2.30
60L 5.4 2.60 4.3 2.20
80L 8.7 2.90 7.2 2.70
100L 11.2 3.02 9.4 2.93
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OPTIONAL ELECTRIC HEATING
at 230V 50Hz at 240V 50Hz
IMPACT-L (kW) (kW)
20L 0.7 0.8
40L 1.4 1.5
60L 2.1 2.25
80L 2.75 3.0
100L 3.2 3.5
AIRFLOWS IMPACT UNITS
MIN Speed MED Speed MAX Speed
IMPACT-L CFM m
3
/s CFM m3/s CFM m3/s
20L 125 0.06 170 0.08 210 0.10
40L 275 0.13 345 0.16 420 0.20
60L 360 0.17 440 0.21 645 0.30
80L 465 0.22 695 0.33 905 0.43
100L 550 0.26 750 0.35 1110 0.52
AIRFLOWS OUTDOOR/DUCTED UNITS
MIN Speed MAX S p eed Min. Speed Max. Speed
Model CFM m
3
/s CFM m3/s Model CFM m3/s CFM m3/s
MCU(+) 15 MHPUL 15 1200 0.57 1720 0.81 DCUE 15 680 0.31 930 0.44
MCU(+) 30 - 1200 0.57 1720 0.81 DCUE 30 685 0.32 885 0.42
MCU(+) 40 MHPUL 30 1080 0.51 1530 0.72 DCUE 40 680 0.31 800 0.38
- - ---- - 8850.421115 0.53
MCU(+) 60 MHPUL 50 1250 0.59 1660 0.78 DCUE 60 885 0.42 1115 0.53
MCU(+) 80 - 1250 0.59 1660 0.78 DCUE 80 740 0.34 1040 0.48
MCU(+) 90 MHPUL 80 1440 0.68 2420 1.14 - ----
MCU(+) 100 MHPUL 90 1440 0.68 2420 1.14 - ----
SOUND POWER and SOUND PRESSURE LEVELS
537 SERIES IMPACT-L
SOUND POWER LEVELS
SOUND PRESSURE LEVELS
Frequency Hz
MODEL SPEED 125 250 500 1K 2K 4K dBA dBA NC
20L
Min 42.1 48.6 52.2 47.4 40.7 34.8 52.1 31.6 26
Med 45.5 51.3 54.6 51.8 45.3 39.1 55.6 35.1 30
Max 48.3 53.9 57.2 55.2 48.8 42.9 58.7 38.2 33
40L
Min 45.9 51.4 53.3 51.3 46.9 44.6 55.6 35.1 30
Med 47.5 53.1 55.4 53.5 48.9 45.8 57.6 37.1 32
Max 50.7 55.6 58.0 56.6 51.9 48.0 60.4 39.9 35
60L
Min 56.4 51.1 52.8 50.2 47.2 42.4 55.2 34.7 27
Med 56.6 53.0 55.4 52.9 48.6 43.6 57.3 36.8 31
Max 58.0 57.8 60.3 58.9 53.7 48.9 62.6 42.1 37
80L
Min 46.5 49.5 51.2 47.6 41.4 34.3 51.9 31.4 25
Med 48.2 50.6 52.6 49.1 43.2 35.7 53.3 32.8 26
Max 53.4 57.5 60.0 58.3 53.0 47.6 62.0 41.5 36
100L
Min 43.3 47.5 46.8 44.7 40.5 38.3 49.7 29.2 22
Med 48.6 51.1 52.3 49.7 43.6 39.4 53.8 33.3 27
Max 54.9 59.9 62.6 61.5 56.2 52.0 65.1 44.6 40
Sound Power Levels were obtained in full conformity with BS 4196: Part 5: 1981. Quantities are shown in dB with a standard
reference of 1 pW.
Sound Pressure Levels are dB relative to 2 x 10
-5
N/m2 and are calculated from the results under anechoic conditions and
are quoted as an average of all points on a hemisphere of a radius of 3m away from the centre of the unit.
-7-
SOUND POWER and SOUND PRESSURE LEVELS
550/551 SERIES MCU, MCU+ and MHPUL
MAXIMUM SPEED
SOUND POWER LEVELS
SOUND PRESSURE
LEVELS
Frequency Hz
MCU(+) MHPUL Compressor 125 250 500 1K 2K 4K dBA dBA NC
15 15 Recip 77.2 67.3 68.7 64.7 60.0 53.9 69.7 49.2 44
30 30 Recip 77.4 67.5 68.5 64.8 60.2 53.8 69.8 50.0 44
40 -- Recip 77.3 67.4 68.6 64.7 60.1 53.9 69.8 49.3 44
-- 50 Scroll 73.6 68.2 67.1 65.5 61.1 54.3 69.7 49.2 44
60 -- Scroll 72.9 67.7 67.8 66.4 61.9 54.1 70.3 49.8 45
80 -- Scroll 70.9 68.6 68.1 65.3 59.5 53.8 69.7 49.2 43
-- 80 Scroll 75.4 72.9 69.1 68.8 62.6 56.6 72.4 51.9 47
90 90 Scroll 81.8 71.8 69.2 68.6 63.1 57.4 72.8 52.3 47
100 -- Scroll 79.4 73.7 71.5 68.5 63.8 58.1 73.4 52.9 47
MINIMUM SPEED
SOUND POWER LEVELS
SOUND PRESSURE
LEVELS
Frequency Hz
MCU(+) MHPUL Compressor 125 250 500 1K 2K 4K dBA dBA NC
15 15 Recip 65.4 61.7 65.2 58.4 53.1 47.7 64.4 43.9 40
30 30 Recip 65.6 61.3 65.0 58.5 53.3 47.6 64.5 43.7 40
40 -- Recip 65.5 61.2 65.1 58.4 53.2 47.7 64.5 43.7 40
-- 50 Scroll 67.4 64.1 66.0 63.6 58.7 51.8 67.7 47.2 42
60 -- Scroll 67.4 64.3 67.1 66.8 60.7 51.7 69.7 49.2 45
80 -- Scroll 69.4 66.5 66.9 62.1 56.1 51.6 67.5 47.0 41
-- 80 Scroll 67.5 63.4 64.4 64.2 57.4 51.0 67.0 46.5 43
90 90 Scroll 79.0 65.4 64.9 61.5 58.5 53.7 67.6 47.1 40
100 -- Scroll 75.3 69.4 70.9 63.7 59.7 53.6 70.4 49.9 46
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
-5
N/m2 and 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).
SOUND PRESSURE LEVELS -- DUCTED CONDENSING UNITS AND DUCTED HEAT PUMP UNITS
Measurement
Point
Unit
Size
Fan
Speed
dBA NC
3m from
unit in void
DCUE 15, 30, 40
DHPUE 15, 30
Max 52 46
Min 35 28
DCUE 60, 80
DHPUE 50
Max 54 48
Min 44 31
Office
area
DCUE 15, 30, 40
DHPUE 15, 30
Max 37 26
Min 30 15
DCUE 60, 80
DHPUE 50
Max 42 28
Min 32 17
3m from
discharge grille
DCUE 15, 30, 40
DHPUE 15, 30
Max 52 46
Min 34 27
DCUE 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
-5
N/m2.
-8-
ELECTRICAL DATA (Cooling Data rated at NEMA conditions)
(Heating Data rated at 20°C/12°C indoor; 7°C/6°C ambient)
a) R22 Air Conditioning Systems (with MCU/MCU+)
Single Phase Supply 230Volts - 50Hz Three Phase Supply 400Volts - 50Hz
MODEL INPUT FULL LOAD AMPS
SYSTEM
MAX.
STARTING
CURRENT
INPUT FULL LOAD AMPS
SYSTEM
MAX.
STARTING
CURRENT
COMBINATION
Cooling Heating Cooling Heating Cooling Heating Cooling Heating
IMPACT + MCU(+) kW kW AMPS AMPS AMPS kW kW A/PH A/PH* A/PH
20L + 15 0.9 0.9 4.3 3.7 22 -- -- -- -- -40L + 30 1.2 1.7 6.2 7.3 33 1.7 1.7 4.2 7.3 19
40L + 40 1.4 1.7 7.3 7.3 33 2.1 1.7 5.4 7.3 23
60L + 40 1.4 2.5 7.4 10.8 33 2.1 2.5 5.5 10.8 23
60L + 60 2.3 2.5 10.3 10.8 62 2.3 2.5 4.5 10.8 33
80L + 80 2.9 3.3 11.4 14.4 77 2.9 3.3 4.9 14.4 41
80L + 90 4.0 3.3 16.6 14.4 116 4.0 3.3 7.4 14.4 50
100L + 90 4.0 3.4 16.8 14.4 116 4.0 3.4 7.6 14.4 50
100L + 100 -- -- -- -- -- 4.1 3.4 7.7 14.4 53
b) R22 Air Conditioning Systems (with DCUE)
Single Phase Supply 230Volts - 50Hz Three Phase Supply 400Volts - 50Hz
MODEL INPUT FULL LOAD AMPS
SYSTEM
MAX.
STARTING
CURRENT
INPUT FULL LOAD AMPS
SYSTEM
MAX.
STARTING
CURRENT
COMBINATION
Cooling Heating Cooling Heating Cooling Heating Cooling Heating
IMPACT + DCUE kW kW AMPS AMPS AMPS kW kW A/PH A/PH* A/PH
20L + 15 1.3 0.9 6.0 4.0 25 -- -- -- -- -40L + 30 1.8 1.7 8.4 7.6 37 1.8 1.7 3.6 7.6 19
40L + 40 2.3 1.7 10.6 7.6 51 2.3 1.7 4.8 7.6 24
60L + 40 2.3 2.5 10.7 11.1 51 2.3 2.5 4.9 11.1 24
60L + 60 3.1 2.5 14.3 11.1 61 3.1 2.5 6.0 11.1 26
80L + 80 3.2 3.3 17.0 14.7 72 3.2 3.3 7.0 14.7 26
c) R22 Heat Pump Systems (with MHPUL)
Single Phase Supply 230Volts - 50Hz Three Phase Supply 400Volts - 50Hz
MODEL INPUT FULL LOAD AMPS
SYSTEM
MAX.
STARTING
CURRENT
INPUT FULL LOAD AMPS
SYSTEM
MAX.
STARTING
CURRENT
COMBINATION
STD.
MODEL
+ ELECT
Heating
STD.
MODEL
+ ELECT
Heating
STD.
MODEL
+ ELECT
Heating
STD.
MODEL
+ ELECT
Heating
IMPACT + MHPUL kW kW AMPS AMPS AMPS kW kW A/PH A/PH* A/PH
20(E) + 15 0.9 1.7 4.3 7.8 29 -- -- -- -- -40(E) + 30 1.2 2.8 6.2 13.2 39 1.5 2.8 4.2 11.2 26
60(E) + 50 2.0 4.4 9.1 19.5 43 2.0 4.4 4.4 14.8 33
80(E) + 80 2.9 6.1 11.4 25.4 91 2.9 6.1 4.9 18.9 55
100(E) + 90 4.0 7.0 16.8 30.8 130 4.0 7.0 7.6 21.6 64
* Max. Phase.
d) R407C Air Conditioning Systems (with MCU/MCU+)
Single Phase Supply 230Volts - 50Hz Three Phase Supply 400Volts - 50Hz
MODEL INPUT FULL LOAD AMPS
SYSTEM
MAX.
STARTING
CURRENT
INPUT FULL LOAD AMPS
SYSTEM
MAX.
STARTING
CURRENT
COMBINATION
Cooling Heating Cooling Heating Cooling Heating Cooling Heating
IMPACT + MCU(+) kW kW AMPS AMPS AMPS kW kW A/PH A/PH* A/PH
20L + 15 0.9 0.9 6.4 4.0 23 -- -- -- -- -40L + 30 1.4 1.7 8.7 7.6 37 1.4 1.7 4.5 7.6 19
40L + 40 1.6 1.7 10.8 7.6 51 1.6 1.7 5.7 7.6 23
60L + 40 1.6 2.5 10.9 11.1 51 1.6 2.5 5.8 11.1 23
60L + 60 2.5 2.5 10.2 10.8 62 2.5 2.5 4.6 10.8 33
80L + 80 3.1 3.3 11.9 14.4 77 3.1 3.3 5.3 14.4 41
80L + 90 4.2 3.3 17.3 14.4 116 4.2 3.3 7.5 14.4 50
100L + 90 4.2 3.4 17.5 14.4 116 4.2 3.4 7.7 14.4 50
100L + 100 -- -- -- -- -- 4.4 3.4 7.8 14.4 53
-9-
e) R407C Air Conditioning Systems (with DCUE)
Single Phase Supply 230Volts - 50Hz Three Phase Supply 400Volts - 50Hz
MODEL INPUT FULL LOAD AMPS
SYSTEM
MAX.
STARTING
CURRENT
INPUT FULL LOAD AMPS
SYSTEM
MAX.
STARTING
CURRENT
COMBINATION
Cooling Heating Cooling Heating Cooling Heating Cooling Heating
IMPACT + DCUE kW kW AMPS AMPS AMPS kW kW A/PH A/PH* A/PH
20L + 15 1.3 0.9 6.0 4.0 25 -- -- -- -- -40L + 30 1.8 1.7 8.4 7.6 37 1.8 1.7 3.6 7.6 19
40L + 40 2.3 1.7 10.6 7.6 51 2.3 1.7 4.8 7.6 24
60L + 40 2.3 2.5 10.7 11.1 51 2.3 2.5 4.9 11.1 24
60L + 60 3.1 2.5 14.3 11.1 61 3.1 2.5 6.0 11.1 26
80L + 80 3.2 3.3 17.0 14.7 72 3.2 3.3 7.0 14.7 26
f) R407C Heat Pump Systems (with MHPUL)
Single Phase Supply 230Volts - 50Hz Three Phase Supply 400Volts - 50Hz
MODEL INPUT FULL LOAD AMPS
SYSTEM
MAX.
STARTING
CURRENT
INPUT FULL LOAD AMPS
SYSTEM
MAX.
STARTING
CURRENT
COMBINATION
STD.
MODEL
+ ELECT
Heating
STD.
MODEL
+ ELECT
Heating
STD.
MODEL
+ ELECT
Heating
STD.
MODEL
+ ELECT
Heating
IMPACT + MHPUE kW kW AMPS AMPS AMPS kW kW A/PH A/PH* A/PH
20L + 15 0.9 1.7 6.4 9.9 31 -- -- -- -- -40L + 30 1.4 3.0 8.7 15.7 42 1.4 3.0 4.5 11.5 26
60L + 50 2.1 4.5 9.5 19.9 61 2.1 4.5 4.6 15.0 33
80L + 80 3.1 6.3 11.9 25.9 91 3.1 6.3 5.3 19.3 55
100L + 90 4.2 7.2 17.5 31.5 130 4.2 7.2 7.7 21.7 64
* Max. Phase.
ELECTRICAL LOADS (230V / 50 Hz / 1Ph) (A) or (400V / 50 Hz / 3PhN) (A/Ph)
IMPACT 20L 40L 60L 80L 100L
FAN MOTOR 0.2 0.3 0.4 0.4 0.6
ELECTRIC HEATER (AIR COND.) 3.5 7 10.4 14 14
ELECTRIC HEATER (HEAT PUMPS) 3.5 7 10.4 14 14
MCU(+) 15 30 40 60 80 90 100
FAN MOTOR 0.6 0.6 0.6 0.6 0.6 1 1
R407C COMPRESSOR (1 PH) NOMINAL FLA 5 7.2 9.3 9.2 10.9 15.9 -R407C COMPRESSOR (3 PH) NOMINAL FLA -- 2.7 3.9 3.6 4.3 6.1 6.2
R22 COMPRESSOR (1 PH) NOMINAL FLA 3.5 5.3 6.4 9.3 10.4 15.2 -R22 COMPRESSOR (3 PH) NOMINAL FLA -- 2.7 3.9 3.5 3.9 6 6.1
MHPUL 1530508090
FAN MOTOR 0.6 0.6 0.6 1 1
R407C COMPRESSOR (1 PH) NOMINAL FLA 5 7.2 8.3 10.9 15.9
R407C COMPRESSOR (3 PH) NOMINAL FLA -- 2.7 3.9 4.3 6.1
R22 COMPRESSOR (1 PH) NOMINAL FLA 3.5 5.3 7.9 10.4 15.2
R22 COMPRESSOR (3 PH) NOMINAL FLA -- 2.7 3.4 3.9 6.1
DCUE 15 30 40 60 80
FAN MOTOR 2.6 2.6 2.6 2.6 2.6
CRANKCASE HEATER 0.25 0.25 0.25 0.25 0.25
R407C COMPRESSOR (1 PH) NOMINAL FLA 5 7.2 8.3 12 14.1
R407C COMPRESSOR (3 PH) NOMINAL FLA -- 2.7 3.9 4.2 4.8
R22 COMPRESSOR (1 PH) NOMINAL FLA 3.5 5.3 6.4 12 14.1
R22 COMPRESSOR (3 PH) NOMINAL FLA -- 2.7 3.9 4.2 4.8
-10-
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.
FUSES FOR SYSTEMS WITH SINGLE PHASE (230 volt) OUTDOOR UNITS (A)
IMPACT-L
MCU(+) or
DCUE
20 40 60 80 100
SHSHSHSHSH
15 16 (10) 16
30 16 16
40 20 (16) 16 (20) 16 (20) 20 (16)
60 20 20 (16)
80 25 (20) 25 (20)
90* 32 32 32 32
MHPUE or
DHPUE
SHSHSHSHSH
30 10 16
50 16 20
80* 25 (20) 32
90* 32 32
* Ducted unit not available in this size S= Standard H= Heaters
Figures in brackets are for R22 systems, if different to R407C fuses.
FUSES FOR SYSTEMS WITH THREE PHASE (400 volt) OUTDOOR UNITS (A/Ph)
IMPACT-L
MCU(+) or
DCUE
40 60 80 100
SHSHSHSH
30 10 10
40 10 10 16 (10) 16
60 10 16
80 10 16
90* 16 16 16 16
100* 16 16
MHPULSHSHSHSH
30 10 16
50 10 16
80* 10 20
90* 16 32
* Ducted unit not available in this size S= Standard H= Heaters
Figures in brackets are for R22 systems, where different to R407C fuses.
-11-
IMPACT-L WALL MOUNTED UNIT INSTALLATION
The IMPACT-L wall mounted unit may be matched with an outdoor condensing unit (550 series), a ducted condensing unit
(542 series), or a heat pump outdoor unit (551 series).
The installer supplies:
* 4 off M6 (or equivalent strength) Rawlbolt shields, bolts and washers.
* Fully insulated refrigeration pipework.
* All mains wiring with suitable isolation; Interconnecting wires for indoor and outdoor units.
* Condensate drain (minimum 10mm bore for gravity drain, 8mm bore for condensate pump drain).
* Two spanners for securing the flare connectors.
* A cross-headed screwdriver for releasing the end cover fasteners.
* A 4 or 5mm Allen key for opening the outdoor/ducted unit valves (depending on valve type).
* Method for securing solid sheathed cables if these are used.
Unpacking
Carefully unfasten the banding and lift off the outer cardboard carton sleeve.
The following are supplied:
* IMPACT-L unit (in protective sleeve, held between two polystyrene end caps).
* A cardboard sleeve containing two pipe assemblies complete with insulation and two cable glands suitable
for flexible, p.v.c. sheathed cable.
* A wall mounting bracket also held between the two polystyrene end caps.
* Envelope containing operating instructions to be left with the end user.
Infrared controller, wall mounting bracket, screws and two 1.5V AAA batteries.
1. Remove and place to one side the cardboard sleeve containing the two pipe assemblies, (and remote control
assembly on IMPACT-L models).
2. Lift the IMPACT-L unit from the inner cardboard sleeve complete with the two polystyrene end caps; (this will require
2 people for sizes 60 to 100).
3. Remove the wall mounting bracket and carefully remove the tw o polystyrene end caps
and the protective sleeve from the IMPACT-L unit.
4. Remove both end covers by removing the self tapping screws, one on each end trim.
By pulling the end covers sharply they can be removed from the backpanel and fascia.
Chassis Mounting
NOTE: It is generally easier to fit kits prior to mounting the unit and connecting the pipework.
It is essential to fit a heater kit at this stage if right hand side access will be limited
to less than the unit width.
1. Ensure that the wall is flat and will support the operating weight of the unit, (see below)
2. Ensure that sufficient access is left around the unit for future kit fitting, servicing and maintenance (Fig. 1).
Model
Weight
kg
Operating
Weight
kg
20L 14 15
40L 20 21
60L 24 25
80L 30 31
100L 34 35
*Includes all kits and refrigerant
*Removal or replacement of heater elements
requires a clearance at the right hand side equal
to the length of the unit
Fig. 1.
3. Mark out the two required top hole centres as shown in Fig. 2, (note that the top of the IMPACT unit will be
approximately 100mm above the level of the hole centres). Drill to suit M6 Rawlbolt shields o r equivalent
strength fasteners. Secure the wall mounting bracket to the upper two holes ensuring that it is level.
4. Hang the unit on the two protrusions from the wall mounting bracket and, ensuring that the unit is level, mark
out and drill the lower two holes and secure the unit to the wall.
-12-
Model 20L 40L 60L 80L 100L
A1 445 745 1045 1345 1645
A2 395 695 995 1295 1595
A3 345 645 945 1245 1545
B 370 370 370 370 370
C 340 340 340 340 340
D 3131313131
E 2929292929
Fig. 2.
Condensate Removal
Condensate collects in a drip tray along the full length of the coil.
An outlet pipe is provided at the rear left hand end of the tray for connection to a pipe for gravity drain.
Slide the outlet pipe from the clip and exit the unit vertically through the hole in the backpanel or base tray.
The drain stub has a 14mm o.d. barb and is supplied with connector and a short length of 6.35mm i.d. hose
For connection to a 10-12mm i.d. flexible hose, remove the hose and connector supplied and connect directly to
the stub.
Ensure that the drain pipe is kept below the rim of the drip tray along its entire length.
Once a gravity drain has been installed, check to ensure that the pipe is not kinked and that correct drainage occurs
by slowly filling the drip tray with water.
A condensate pump kit (incorporating over flow protection) can be fitted within the unit to enable a lift of up to 5m.
Air Deflection
Air deflection is set by manua lly adjusting the v anes. The unit is supplied with front discharge but c an be changed
to top discharge as follows.
1. Remove the filters.
2. Remove the end covers.
3. Using a screwdriver or thin bladed tool, release the three tabs at the bottom of the top box; these are
directly below the centre and two end vertical vanes.
4. Lift the top box assembly from the unit.
5. By gently flexing the top box
sides from the rear, transfer the
deflector plate from the upper to
the lower two fixing holes.
6. Rotate the top box assembly and
refit to give top discharge.
-13-
MOUNTING HOLES
INSTALLATION of 550 Series CONDENSING UNITS and 551 Series HEAT PUMP OUTDOOR
UNITS
MCU = standard condensing unit MCU+ = standard condensing unit + FSC + LP MHPUL = electronic heat pump outdoor unit
Some units are supplied with a number of loose restrictors which may be required, depending on the indoor unit
it is matched with and whether the unit is to be run in NEMA conditions; refer to pages 18 and 19.
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 fl at surface. If th e un it is to b e
wall mounted the following kits are available.
(Marstair Ltd cannot accept liability for installers own mounting
arrangements).
Model MCU(+) 15 - 80 / MHPUL 15 - 60 MCU(+) 90 - 100 / MHPUL 80 - 90
Mounting Bracket Kit 55021100 55021101
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(+) 15 - 100 and MHPUL 15 - 90
All dimensions are in millimetres.
MODELABCDEFGH
Weight (kg)
1 Ph 3 Ph
MCU(+) 15 900 300 560 525 185 60 295 275 45 -MCU(+) 30 900 300 560 525 185 60 295 275 48 48
MCU(+) 40 900 300 560 525 185 60 295 275 53 53
MCU(+) 60 1000 300 660 570 213 60 295 275 65 63
MCU(+) 80 1000 300 660 570 213 60 295 275 66 64
MCU(+) 90 1000 350 760 495 250 70 345 325 76 73
MCU(+) 100 1000 350 760 495 250 70 345 325 -- 81
MHPUL 15 900 300 560 525 185 60 295 275 47 -MHPUL 30 900 300 560 525 185 60 295 275 50 50
MHPUL 60 1000 300 660 570 213 60 295 275 68 66
MHPUL 80 1000 350 760 495 250 70 345 325 75 72
MHPUL 90 1000 350 760 495 250 70 345 325 77 75
-14-
DUCTED CONDENSING UNITS and DUCTED HEAT PUMP UNITS
Electronic fan speed control, start delay timer, HP and LP switches, stabilizing brackets and a contactor are fitted
as standard.
It is generally preferable to fit the following kits (if applicable), prior to mounting the unit. Kits available are:-
i) PTC (Positive Temperature Coefficient resistor). } for use on
single phase systems,
ii) CSR (Capacitor Start Relay). } particularly on long pipe runs.
iii) Isolator.
iv) Overload (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 duct.
ii) Plenum (intake/discharge).
iii) Grille (intake/discharge).
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 (kit available), suspe nded 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
Model A B C D E F G H J K Spigot Ø Weight (kg)
DCUE 15 930 510 495 1004 490 65 65 210 317 717 354 69
DCUE 30 930 510 495 1004 490 65 65 210 317 717 354 70
DCUE 40 930 510 495 1004 490 65 65 210 317 717 354 72
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
-15-
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 (also see overleaf). Secure the unit to the floor. Discard the stabilizing brackets.
Dimensions in mm.
Model A B
15 to 40 930 510
50 to 80 1100 510
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
(Fig. 2).
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 theceilingand 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).
Fig. 2.
WALL MOUNTING
Wall mounting brackets are available as an optional kit (53200407).
DUCTWORK
Each unit is supplied with air inlet and discharge spigots:Models 15- 40: 354mm (14") Ø Models 50-80: 404mm (16") Ø.
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.
It is essential that inlet ducting is adequately insulated to prevent sweating,. An insulatio n thickness of at least
45mm is recommended.
Dimensions
(mm)
Model
15 to 40 50 to 80
A 400 450
B 300 350
C 100 100
-16-
APPLICATION
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 25 grams of polyolester (POE) oi l for every 350 grams of charge added to systems with pipe runs
exceeding 25m, up to a maximum of 300 grams; preferably by slowly pumping into the suction side with the
unit running, after charging the system.
3. The maximum pipe lengths to be used for each pipe size and outdoor unit are shown in the table below. Use
of these sizes and lengths is recommended in order to achieve optimum system performance.
4. In calculating equivalent lengths of pipe runs, the effect of bends and fittings must be taken into account. The
table below covers the fittings most likely to be encountered in this type of installation. The e quivalent 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 the total equivalent length.
FITTING LOSSES, in equivalent straight lengths of pipe (metres).
Pipe Size (outside diameter in inches)
Fitting 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 = 1.5 0.24 0.27 0.30 0.37 0.43 0.52
180° Bend C/d = 1.5 0.73 0.91 1.10 1.28 1.46 1.83
180° Bend C/d = 2.5 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
5. Use the shortest possible route, avoiding sharp bends.
6. Fully insulate both the suction and expansion lines, including the expansi o n d e vice, since both lines may
sweat.
-17-
RESTRICTORS
Outdoor units are supplied with cooling restrictors fitted in the expansion assembly; refer to the following tables
for any restrictor changes. Those ticked do not require a change of restrictor.
Heat pumps are supplied with a heating resrtrictor in an expansion assembly. Th is mu st be fitted close to the
indoor unit in the expansion line, arrows pointing in the direction of the outdoor unit.
Where appropriate, the alternative cooling or heat ing restrictor is supplied with either the indoor or the outdoor
unit.
SYSTEM
MATCH
PIPE CONNS MAXIMUM PIPE RUNS (m) COOLING RESTRICTOR
R407C (R22)
CHARGE TO ADD
(for 7.5m)
SUC
N
EXP
N
SUCTION EXPANSION
MCU(+) DCUE
UK NEMA
UK +
NEMA
UK
(g)
NEMA
(g)
3/8 1/2 5/8 3/4 7/8 1
1
/83/8 1/2 5/8
IMPACT 20L 3/8 3/8
7.5 30 50 50 033 035 032 210 (200) 240 (230)
MCU(+)15
DCU(+) 15
3/8 3/8
IMPACT 40L 1/2 3/8
15 50 80 50 80 040 042 039 0 (0) 60 (65)
MCU(+)30
DCU(+) 30
1/2 3/8
IMPACT 40L 1/2 3/8
10 36 80 7.5 80 042 044 041 140 (140) 245 (240)
MCU(+)40
DCU(+) 40
1/2 3/8
IMPACT 60L 5/8 3/8
10 36 80 7.5 80 042 044 043 200 (200) 305 (300)
MCU(+)40
DCU(+) 40
1/2 3/8
IMPACT 60L 5/8 3/8
14 36 80 7.5 50 80 051 053 050 0 (0) 670 (635)
MCU(+)60
DCU(+) 60
5/8 3/8
SYSTEM
MATCH
PIPE
CONNS
MAXIMUM PIPE RUNS (m)
COOLING
RESTRICTOR
HEATING
RESTRICTOR
(WITH ODU)
R407C (R22)
CHARGE TO ADD
(for 7.5m)
SUC
N
EXP
N
SUCTION
EXPAN-
SION
MHPUL
MHPUL
UK NEMA
UK
(g)
NEMA
(g)
3/8 1/2 5/8 3/4 7/8 3/8 1/2 5/8
IMPACT 20L 3/8 3/8
7.5 30 80 50 033 035 035 0 (0) 170 (180)
MHPUL 15 3/8 3/8
IMPACT 40L 1/2 3/8
15 50 80 50 80 040 042 039 0 (0) 160 (170)
MHPUL 30 1/2 3/8
IMPACT 60L 5/8 3/8
7.5 18 50 80 7.5 50 80 052 052 044 0 (0) 90 (100)
MHPUL 50 1/2 3/8
PIPE CONNECTIONS
IMPACT-L UNITS
Pipework is terminated at the left hand side of the unit. Two pipe assemblies are supplied loose
with flare nut connectors to enable pipe exit from either the top or bottom of the unit via
knockouts. Rear pipe exit is possible with installer supplied pipework.
Always use two spanners to secure the flare connections to avoid distorting and damaging the
pipework.
Pipe flare connections (in inches) are;
IMPACT Model 20L 40L 60L 80L 100L
Expansion Pipe 3/8 3/8 3/8 1/2 1/2
Suction Pipe 3/8 1/2 5/8 5/8 3/4
PIPEWORK CONNECTION and RESTRICTORS
1. If top or bottom pipe exit is required, remove the appropriate knockout in the backpanel flanges.
2. Remove and retain the flare nuts from the coil, (the bonnets should be discarded).
3. Screw the angled ends of the pipe extensions to the male connectors on the coil, ensuring that the straight
ends extend through the knockout.
For pipe exit through the rear of the unit, the installer must supply appropriately flared pipework.
On heat pump systems the IMPACT unit needs to have an expansion assembly fitted: refer to the n ext
section.
-18-
4. Interconnecting pipework should be installed in
accordance with good refrigeration practice.
5. Final connection is made to the male flare
connectors, either on the pipe extensions (for top
or bottom entry) or directly onto the coil (for rear
entry).
6. Care should be taken to ensure that pip e flares
are correctly formed and have undamaged
seating surfaces. The use of a little oil on the
flaring tool will help. DO NOT FORGET to fit the
flare nut onto the pipe BEFORE flaring it.
7. Make the flare connections to IMPACT-L using a
little refrigeration oil on the mating surfaces.
Always use two spanners in opposing directions
to avoid twisting the pipework and damaging the
coil connections.
OUTDOOR/DUCTED UNITS
1. Outdoor/ducted units are supplied with the
following male flare connections (sizes in inches);
Model
Size
MCU(+) / DCUE MHPUL
15 30 40 60 80 90 100 15 30 50 80 90
Expansio 3/8 3/8 3/8 3/8 1/2 1/2 1/2 3/8 3/8 3/8 1/2 1/2
Suction 3/8 1/2 1/2 5/8 5/8 5/8 3/4 3/8 1/2 1/2 5/8 3/4
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, w hich may be released into the atmospher e
without damage to the environment. This should be done prior to making pipework connections.
2. Outdoor units are delivered with restrictors: see page 18 for details of any changes necessary.
3. MHPUL 15 - 90 are supplied with 2 expansion assemblies. One is fitted to the outdoor unit and one is supplied
loose to be fitted to the indoor unit. For any change of restrictor, reference must be made to the tables on
pages 18 and 19.
a. When installing a heat pump system, the second expansion assembly (140mm long) must be fitted to the
expansion line as close to the indoor unit as possible. This provides throttling of the refrigerant and
eliminates the need for separate check valves.
b. Remove the flare nuts from the suction service valve and the expansion device as appropriate.
c. Ensure that both the suction and expansion lines are fully insulated.
d. Place the flare nuts over the incoming pipework and flare the pipe ends. The use of a little refrigeration
oil on the flaring tool will help.
e. Connect the pipework between the units. Do not leave pipe ends, valves etc. open to the atmosphere.
Always use two spanners when tightening the flare nuts to avoid twisting the pipes. Use a small amount
of refrigerant oil on the mating surfaces.
f. Sight glasses and filter driers are not necessary, but if required should be fitted between the outdoor unit
liquid shut off valve and the expansion device.
4. For units supplied with an alternative restrictor, replace the restrictor in the
outdoor unit by:
a. Completely removing the expansion assembly from the outdoor unit.
b. Split the expansion assembly in the middle.
c. Remove the existing restrictor.
d. Drop the new restrictor vertically downwards into the field connector.
e. Reassemble in the vertical plane (field connector lowest) and refit the
expansion assembly to the outdoor unit.
-19-
ELECTRICAL CONNECTIONS
CONFIGURATION
HEAT PUMPS
need to have a resistor removed from the external electrics box.
AIR CONDITIONERS
need to have the pcba jumpers reconfigured.
HEAT PUMPS
The printed circuit board is supplied configured for heat
pump systems.
NO JUMPER RE-CONFIGURATION IS NECESSARY JUMPER IS FITTED TO JMODE or CNMODE.
INDOOR BOARD
(AS SUPPLIED SUITABLE FOR HEAT PUMP SYSTEMS)
THERE SHOULD NOT BE A RESISTOR CONNECTED TO
THE TERMINALS MARKED 'S'
AIR CONDITIONERS
PRIOR TO CONNECTING A POWER SUPPLY
For use in an air conditioning system with or without an
electric heater fitted, reconfigure the printed circuit
board as follows:
1. Locate programming plug JMODE or CNMODE in the
middle of the printed circuit board.
2. Remove and discard programming p lug JMODE or
CNMODE.
INDOOR BOARD
(RECONFIGURED FOR AIR CONDITIONING SYSTEMS)
THE RESISTOR SHOULD REMAIN CONNECTED TO THE
TERMINALS MARKED 'S'
INCORRECT PROGRAMMING
If the unit has been powered whilst incorrectly programmed, turn the power OFF then ON again.
ALL SYSTEMS
Systems require a supply to the outdoor unit with connecting cables run to the indoor unit.
Refer to pages 27 to 31 for the interconnecting wi rin g diagrams.
Mains, control and interconnecting cables are supplied and fitted by the installer.
Installer wiring must be carried out in accordance with local and national codes.
Cables must be size compatible with the recommended fuse for a given system.
An isolator switch should be positioned within easy reach of the indoor unit.
The equipment MUST be earthed.
-20-
Cable clamps for use with stranded cables are supplied in units 15 - 90 and should be used to secure all
incoming/outgoing cables. Installers must supply a method of securing any solid sheathed cables.
OUTDOOR UNIT WIRING
Cable entry for the outdoor unit electrics is through the cabinet to a terminal block.
MCU+, MHPUL and DCUE are supplied wired via the head pressure controller to give maximum control. Ensure
that all connections are secure and that both units are earthed.
Electromechanical condensing units (MCU) are supplied wired for low fan speed, which is suitable for
temperate climates. If continuous running is expected at ambient temperatures of 35°C or higher, change to
high speed by interchanging the black and red wires, i.e. black to fused terminal, red to terminal 4 (single fan
units) or terminals 4 and 8 (double fan units).
COMPRESSOR ROTATION
On 3 Phase units sizes 50 to 100 it is possible for the scroll compressor to run backw ards. 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.
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.
FIRE LINK
In order to automatically switch off the fan in the event of a fire, it is necessary to fit an external switch (240V,
3A, closed to run, volt free contact) in series with the small black wire connected to the bottom terminal of the
fuse.
This switch should be operated by the building's fire alarm or BMS system.
IMPACT-L REMOTE CONTROLLER
IMPACT-L indoor units are supplied with a remote controller, wall mounting
bracket, two batteries, and screw s: suitable w all plugs must be provided by the
installer.
The controller operates remotely by infrared signals and the bracket may be used
to park the controller for convenience.
Infrared operation
Slide down the cover at the front of the controller. Insert two AAA batteries,
(checking polarity), then close the cover.
The controller is now ready for operation, as shown on page 32 .
Avoid installing the unit at high level with the infra red receiver (display)
close to, and in direct line of sight of, fluorescent lamps as this may cause
false operations. If this should occur, reset by turning the power off for a
few seconds.
EVACUATING
1. 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.
2. If NO additional refrigerant charge is required:
Replace the caps on the service ports, (tighten to a torque of 25NM), a n d o pen the valves using a 4 or 5mm
Allen key. On electronic units, REMOVE link JP6 identified by a white label, (otherwise the unit will always run
at full speed).
ADDING REFRIGERANT
1. If additional refrigerant charge is required:
After evacuating the indoor unit a nd inte rconne c t ing pipe work, open the v a lves using a 4 or 5mm Allen key.
-21-
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. Additional char ge should be introduc ed through the Sc hrader v a lv e on the indoor unit or the ser v ice port on
the suction service valve on the outdoor unit (see charging section ov erleaf to calculate the weight).
4. DCUE are supplied with link JP6 fitted on the outdoor unit pcba; this allows additional charging and overrides
alarms during the charging process. With both units powered, the DCUE fan will run at high speed and IMPACT
L indoor fan will run at maximum speed. When JP6 is linked, the infrared handset is inoperative.
MCU+ units are fitted with head pressure control; before charging, isolate the unit and transfer the blue wire
on the head pressure control from terminal 4 to terminal 1. Do NOT forget to transfer it back o nce chargi ng
is complete.
5. Ensure that the refrigerant being added is the same refrigerant that the system was originally charged with.
6. If a manual HP cutout is fitted, ensure that the reset button is depressed.
7. On DCUE and MHPUL models 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 incorporating DCUE and
MHPUL units, or MCU(+) units fitted with a 3 minute timer kit.
8. Run the system for a few minutes to allow it to stabilize. Where p ossible, charge to a sweat line on the
evaporator. Typical suction pressures on short lines at UK conditions, with high speed evaporator fan, low
speed condenser fan (commissioning speed for DCUE), should be; electromechanical comfort systems
approx. 4.4 bar (65 psig); electronic comfort systems approx. 3.8 bar (55 psig); heat pump systems approx.
4.0 bar (58 psig).
Care should be taken when the compressor is first started in the field to ensure that the system is not
overcharged, in which case liquid return to the compressor cou ld result.
9. On DCUE units, once refrigerant has been added, REMOVE link JP6, identified by a white label (otherwise the
unit will always run at full speed).
10. On MCU+ units,return the blue wire from 4 to 1.
CHARGING
IMPACT-L WALL MOUNTED SYSTEMS - pipe runs below 7.5m.
Each outdoor unit is charged with R22 or R407C as shown on page 16. Additional refrigerant may be needed at
any operating condition.
Where additional refrigerant is needed this is shown on P16. Additional oil is not required.
IMPACT-L WALL MOUNTED SYSTEMS - pipe runs over 7.5m.
For pipe runs over 7.5m, extra refrigerant and oil must be added to the system by the installation engineer as
shown on page 16 PLUS additional refrigerant and o il for each metre over 7.5m, based on the following:
Expansion line size. 3/8 1/2 5/8
Additional refrigerant (g/m) 16 30 48
Additional oil
25g per 350g of additional
refrigerant to a maximum of 300g
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.
-22-
IMPACT-L WIRING DIAGRAM
B BROWN H HEAT/HEATER
R RED TH THERMISTOR SENSORS
O ORANGE RY RELAY
Y YELLOW F FUSE
G GREEN C CAPACITOR
BL BLUE M1 MOTOR FAN
V VIOLET TX TRANSFORMER
GRY GREY P PINK
W WHITE BK BLACK
-23-
MCU WIRING DIAGRAMS
1 Phase MCU 15 to 90 3 Phase MCU 30 to 100
MCU(+) WIRING DIAGRAMS
1 Phase MCU+ 15 to 90 3 Phase MCU+ 30 to 100
-24-
MHPUL WIRING DIAGRAMS
1 Phase MHPUL 15 to 60
1 Phase MHPUL 80 - 90
-25-
3 Phase MHPUL 30 to 90
ELECTRONIC DCUE WIRING DIAGRAMS
1 Phase DCUE 15 - 60
-26-
1 Phase DCUE 80
3 Phase DCUE 30 to 80
-27-
80L - 100L and 1 Phase MCU(+) 80 - 90
20L - 60L and 1 Phase MCU(+) 15 - 60
IMPACT L INTERCONNECTING WIRING DIAGRAMS
-28-
20L - 60L and 1 Phase MHPUL 15 - 50 80L - 100L and 1 Phase MHPUL 80 - 90
-29-
40L - 100L and 3 Phase MHPUL 30 - 9040L - 100L and 3 Phase MCU(+) 30 - 100
-30-
80L and 1 Phase DCUE 8020L - 60L and 1 Phase DCUE 15 - 60
-31-
40L - 80L and 3 Phase DCUE 30 - 80
USER MAINTENANCE
Isolate at the mains supply before commencing any maintenance work.
THE UNIT SHOULD ALWAYS BE USED WITH A FILTER
In order to maintain efficiency it is important that the filters behind the air intake grilles
are cleaned regularly. This will normally be every two or three weeks.
The filters should be removed from the bottom of the grille on high lev el units, or from
the top of the grille on low level units.
Carefully slide each filter from behind the air intake grille. Wash the filter in tepid water
and dry before use. Alternatively tap the filter gently to remove dust.
-32-
INFRARED REMOTE CONTROLLER - OPERATING INSTRUCTIONS
• The handset should be pointed towards the unit.
• Two seconds after the last button press, the whole displayed programme is automatically transmitted.
• The unit responds with 1 beep.
• The transmit symbol A flashes whilst transmission is taking place.
• Displayed values may be re-sent at any time by pressing the pink button twice.
1. Remote Controller Power Up
Rem ove the battery cover and insert two "AAA" size 1.5V batteries.
The initial display will show:
COOL
HIGH FAN SPEED
TEMPERATURE
'ON' TIMER SWITCHED OFF
TIME 'OFF' TIMER SWITCHED OFF
2. Setting Cool/Heat/Dry Modes
COOL - Unit cools when required but cannot heat
DRY - Unit removes moisture by cycling cooling at low speed,
humidity is reduced, but room temperature is not changed.
FAN ONLY - No cooling or heating - fan only
HEAT - If heating is available, unit heats when required but cannot cool.
AUTO COOL/HEAT - Unit cools or heats when required (if heating is available)
3. Setting the Fan Speeds
Repeated pressing of the 'fan speed selection' button selects low, medium, high and auto speeds. In 'auto' selection, the fan
runs at high speed when there is a difference of more than 2°C between the room temperature and the set (required)
temperature, and low speed when less than 2°C.
4. Setting the Temperature
-33-
Press the ‘up’ or ‘down’ 'set temperature' button to alter the display between 16°C and 30°C.
By holding both buttons down, the display is changed between °C and °F.
5. Setting the Clock (Current time)
The ‘up’ and ‘down’ buttons must be held down for 3 seconds before they operate. Continue to hold the button down for rapid
change.
6. Programming the Timer
The 24 hour timer can have one ON command or one OFF command or one ON/OFF cycle in a 24 hour period. Blank ON and
OFF timer windows indicate that the timer is not programmed.
7. Setting the ON Time
Press the TIMER ON set ‘S’ button and step to the required ON time. Hold the button down for repeated stepping. Press the
TIMER ON ‘C’ button to cancel the ON time.
8. Setting the OFF Time
Press the TIMER OFF ‘S’ button and step to the required OFF time. Hold the button down for repeated stepping. Press the
TIMER OFF ‘C’ button to cancel the OFF time.
9. Only ON Time Selected
Unit will turn ON at the selected time and stay ON.
10. Only OFF Time Selected
Unit will turn OFF at the selected time and stay OFF.
11. Use of the Pink H ON/STANDBY button when time programmes are selected
At any time, pressing the Pink button will either start the unit or return it to standby mode. The unit will remain at this condition
unless an appropriate ON or OFF time has been programmed.
12. Cold Start
In Cool or Heat mode, not Auto, after more than 3 days without power, or after 2 hours of non-operation, the set temperature
is automatically raised (in heating mode) or lowered (in cooling mode) by 2°C until this temperature is reached, or the unit has
run for 20 minutes, after which the unit operates with the displayed temperature. This decreases the time taken to reach set
point.
14. Off cycle delay
To prevent operational problems, cooling restart is delayed for 3 minutes following power up, or from the time the unit was
last cooling or heating, (if heat pump). Cooling or heating, (if heat pump) will operate for a minimum of 2 - 3 minutes.
15. Displays
Cool Dry Fan Heat
DIAGNOSTICS
DI4F
Green Red Red Amber
OFF OFF OFF OFF
No power, manual OFF, timed OFF,
condensate high level, fault in condensate
control
ON OFF ON OFF Cooling mode selected
ON OFF ON BLINKS AUTO - predominantly cooling
OFF OFF ON ON Heating mode selected
BLINKS OFF ON ON AUTO - predominantly heating
OFF OFF ON OFF Fan mode selected
OFF ON ON OFF Dry mode selected
OFF OFF OFF BLINKS Outdoor unit defrosting
Diagnostics
OFF OFF BLINKS x 4 OFF Room sensor missing
OFF OFF BLINKS x 4 OFF Indoor coil sensor missing
OFF BLINKS BLINKS x 4 OFF Heat pump only, outdoor coil sensor missing
BLINKS OFF BLINKS x 1 OFF Compressor overload
16. Heat Pump Only
If the outdoor coil temperature reaches 68°C, the compressor and outdoor fan will stop until the coil cools to 50°C.
17. Commands Refused
a. Attempts to set temperatures outside the display range are not transmitted.
b. If heating commands are refused, the installer's programming is incorrect - call the engineer.
18. Battery Replacement
It is advisable to replace the batteries as soon as the display begins to fade. Correct transmission cannot be guaranteed if the
battery is failing.
19. Power Cuts
The unit permanently memorises its settings.
20. User Maintenance
Isolate the unit at the mains supply before commencing any maintenance work.
The unit should always be used with a filter. In order to maintain efficiency it is important that the filter behind the air intake
grille is cleaned regularly:
! Remove the filter(s) from behind the air intake grille.
! Wash the filter (in tepid water only) and shake dry before use.
! Alternatively tap the filter gently to remove dust or vacuum clean.
! To clean the unit use soap or a non-scratch liquid cleaner.
-o-o-o-O-O-o-o-o-
-34-
ELECTRIC HEATER KITS FOR IMPACT UNITS
UNIT SIZE 20 40 60 80 100
ELECTRONIC KIT 53700415 53700416 53700417 53700418 53700419
TOTAL DUTY (kW at 240V 50Hz) 0.8 1.5 2.25 3.0 3.5
ITEM QTY DESCRIPTION
1 2 Heater Element
2 1 Heater Cutout Assembly
3 1 Cable Tie
41Screw No. 8
5 1 Connector Block
6 1 Retaining Bracket
72Screw No. 6
8 2 Insulation Boot
ISOLATE THE UNIT ELECTRICALLY PRIOR TO INSTALLATION OF THIS KIT
1. Remove both end covers of the unit by releasing the self tapping screws and pulling the end covers forward
to release them from the front cover.
2. Loosen the two retaining screw s on the electrics plate and swing the
electrics plate outwards taking care not to damage th e thermostat
capillary on electromechanical models.
3. Remove the filter from the right hand end of the grille and measure the
distance between the spring clip fitted to the co il and the coil end
plate, (Fig. 1). If the spring clip is at the correct distance, i.e., 135mm for
IMPACT 20 and 40, 205mm for IMPACT 60, 80 and 100, continue from
instruction 4. If the distance is incorrect, move the spring clip as follows:
a Remove the front/air return grille from the unit.
b Note the two tubes of the coil wh ich the spring clip is fitted to.
c Remove the clip by squeezing both legs inwards.
d Replace the spring clip between the same two tubes at a distance
of 205mm from the coil end plate.
4. The heater elements are fitted from the right hand side of the unit. Feed
the flying lead into one of the tw o holes in the middl e of the coil block
first, (Fig. 2), then push the heater element through the coil block until the
rubber elbows seat firmly against the end plate notches, (Fig. 3). Secure
the elements in position with the retaining bracket, (Fig. 4).
Fig. 1.
Fig. 2. Fig. 3. Fig. 4
-35-
Fig. 5.
Fig. 6.
5. Slide the heater cutout bracket under the spring clip
fastened to the coil, (Fig. 5); ensure that the cutout is
held firmly against the coil block, reposition the spring
clip if necessary.
6. Pass the heater cutout wires through the slot in the
heater cutout bracket and screw the bracket to the
coil end plate using the No. 8 screw, (Fig. 6).
7. Push the rubber grommet fitted to the heater cutout
wires into the slot in the coil end plate, (Fig. 6).
IMPACT 20 and 40 models have their heating elements
connected in series.
IMPACT 60 to 100 models have their heating elements
connected in parallel.
Failure to wire in this way could result in severe
overheating.
8. On IMPACT 20 and 40 models: a pair of two way in-line
connectors are supplied connected to a blue w ire and
one of
the heater cutout wires. Insert the heater element flying
leads
into the two vacant terminals on the two way connectors
Connect the blue wire into the neutral terminal block in the
electrics box.
9. On IMPACT 60 to 100 models: a bridge connector is supplied
connected to one of the heater cutout w ires. Inser t the heater element
flying leads into any tw o of the three vacant terminals on the bridge
connector.
10. A bridge connector is supplie d at the left hand side of the unit atta che d
to the back panel with an edge clip, (Fig. 7). Fit the insulation boots to the
female in-line terminals on the heater element flying leads and insert into
any two of the vacant bridge connector terminals. Discard the in-line
terminal.
Fig. 7
WIRING
1. Connect the free wire from the heater cutout to the free terminal on the heater relay on the circuit board.
ELECTRONIC IMPACT HEATER KIT WIRING DIAGRAMS
-o-o-o-O-O-o-o-o-
-36-
CONDENSATE PUMP KIT 53700410
This kit is for use on all IMPACT units for the removal of condensate where gravity drain is not practicable or
desirable.
The pump is capable of overcoming a resistance equivalent to 5 metres lift.
The sensor is arranged so that residual condensate in the sump is kept to a minimum.
The kit includes an overflow protection circuit which will prevent further cooling and condensate production if a
high condensate level occurs.
ITEM QTY DESCRIPTION ITEM QTY DESCRIPTION
1 PUMP ASSEMBLY CONSISTING OF: 2
CONTROL BOARD ASSEMBLY
CONSISTING OF:
1Pump
2 Grommet 1 Control Board
2 Hose 4 Mounting Foot
1 Green/Yellow Cable 1 Plastic Cover
1 Bracket 3 4 Cable Tie
1 Connector 4 2 No. 6 Screw
2 Cable Tie 5 1 S ensor Block (with filter)
It is preferable to fit this kit prior to installing the unit; the following instructions refer to bench fitting.
ISOLATE THE SYSTEM ELECTRICALLY PRIOR TO INSTALLATION OF THIS KIT
1. Remove both end covers by removing the self
tapping screws, one on each end trim. By pulling
the end covers sharply they can be removed
from the backpanel and fascia. It is not necessary
to remove the front covers, or to open out the
electrics plate..
2. Remove the drip plate from the left hand coil
hanger bracket. If the plate has keyhole slots, there
is no need to fully remove the retaining screws
3. The sensor block is supplie d fitted to a tran sition
bracket for use on units with a drip plate with
screws fitted. Hook the bracket onto the two
screws and tighten them.
Where the unit is fitted with a drip plate with
notches, unclip the sensor block from the
transition bracket (by depr essing th e left hand lever ,
swing away from the bracket and carefully unhook
the right hand hook). Discard the transition bracket.
Fit the sensor block to the drip plate by locating the
fixed hook into the right hand notch, depress the lever
and locate the moving hook into the left hand notch.
Refit the drip plate.
4. Secure the pump assembly to the lef t hand coil
hanger bracket using the two No. 6 screw s; use
one of the screws to secure the earth
(green/yellow) cable ring terminal between the
pump bracket and the hanger bracket, (Fig. 1).
5. Remove the parking terminal from the top of the
hanger bracket, remove the cables and discard the
parking terminal.
Fig. 1.
6. Push the control board into the four holes, (Fig. 1), ensuring that the plastic sheet is free to fold over the front
of the board.
7. Push the pump inlet hose fully onto one of the sensor block top spouts; avoid kinking
8. The pump top hose is supplied fitted with a connector suitable for connection to 8mm bore plastic hose. If 1/4"
diameter copper is to be used, the connector should be discarded and the hose pushed directly onto the
copper, for a minimum of 20mm, and be secured with a cable tie. If the condensate is to exit the unit at the back
or the bottom, ensure that the pump hose does not kink.
NOTE: If the drain outlet is below the level of the unit, syphoning may occur, creating noise on pumping. To ensure
quiet running, fit an air break no further than 200mm below the level of the base of the unit, e.g., by
pumping into a larger diameter pipe than that from the pump.
9. Make the following elect rical connections to/from the control board.
a. Black cable (from parking terminal) to terminal L.
b. Blue cable (from parking terminal) to terminal N.
-37-
c. Two pump cables to terminal P/N and P/L, (these are non-polarised).
d. The sensor block flying lead plug to the six pin connector.
e. Cut the looped red cable above the coil in half. Bare back each end by 5mm and connect to the
plug-in screw terminal block to the left of the six pin connector.
10. Fold the plastic sheet over the front of the control board and secure to the two pump leads, using a cable tie
through both holes in the sheet.
11. TESTING THE PUMP AND CONTROL
a. Connect a suitably fused supply to the unit (refer to the unit installation instructions).
Allow approximately one minute for the controls and sensor to stabilize.
b. Slowly add water to the condensate tray sump until the pump runs. Initially the pump will be noisy until
the air in the hose has been expelled. It is possible that, on this first cycle, the pump will run dry
for a short period (indicated by noise).
c. Add more water to the sump and the pump will cycle in the normal manner.
d. With the syst e m i n coolin g mo de, con tinue ad din g water to the sump until it reaches the higher of the
sensor probes. The cooling cycle will shut down, and the pump continue to run, until the water
has dropped below the level of this probe.
12. Refit the end panels by locating the end tabs into the fron t grille end slots and pivoting the box backwards.
Secure by replacing the self tap p ing screws.
NOTE: Whenever the electrical supply to a unit fitted with a condensate pump an d controls is interrupted, a delay
of up to 1 minute will occur before the compressor or the pump will start when the supply is reinstated.
TROUBLE SHOOTING
Unit will not cool No mains supply to the control board.
Pump does not run Fuse on control board blown (315 mA x 20mm)
Sensor disconnected from control board
Cooling is interrupted Restriction in pump flow allowing level to rise and trip overflow circuit
Check for blockage or kink in hoses.
Condensate at high level -- tripping overflow circuit
Filter blocked - Remove and clean
Excessive pump noise Air leak in hoses and/or joints
Pumping without water in sump -- control board fault
Loose connection between sensor and control board
Loose fuse, intermittent mains supply to control board
Water syphoning due to lack of air break
APPLICATION NOTES
1. The pump will work against a 5m head. Flow rate is highest with minimum head.
2. Long lengths of drain pipe should not be exposed to the outdoor ambient, otherwise freezing of condensate
may occur during winter operation.
3. It is not advisable to have the outlet of the drain well below the position of the pump, otherwise the syphon
effect may open the pump valves.
4. For normal applications, i.e., where the drain is level or above the pump or within 3 feet below it, no extra check
valves are needed; the pump has its own internal check valves.
5. Ensure that no hose is kinked, as this could seriously affect the pump performance.
6. Clean the filter at regular intervals.
-o-o-o-O-O-o-o-o-
-38-
FAULT FINDING
CONDITION POSSIBLE CAUSE ACTION
A Indoor fan motor will not run
No electric supply at socket or switched
fuse
box
Check fuse rating and replace if
necessary. Check for loose electrical
connections
Unit wiring fault Check wiring and connections
Fan motor capacitor defective Replace if faulty
Fan motor defective Replace if faulty
Internal fuse(s) blown Clear fault and replace fuse
B Inadequate cooling or heating Dirty evaporator fins/filter Clean if blocked
Evaporator motor not running As in section A
Refrigerant shortage or excess
Check for leaks. Repair, evacuate and
recharge or check for high head pressure
and recover refrigerant if necessary
Faulty electronic controls Replace if faulty
Dirty condenser Clean if necessary
Faulty compressor Replace
LP cutout circuit open (if fitted) Check as refrigerant shortage or excess
C
Compressor and outdoor fan motor
will not run
LP cutout circuit open (if fitted) Check as above
No electric supply at socket or switch fuse
box
Check fuse rating and replace if
necessary. Check for loose electrical
connection.
Unit wiring fault Check wiring and connections
Capacitor, controls, contactor or overload
defective
Replace if faulty
Compressor failure Replace if faulty
Controls not set properly Check and rectify
Off cycle delay operating If applicable, wait 3 minutes
High condensate level detected See G
D
System runs for long periods and
will not cycle
Unit underrated for conditioned area Check heat load against capacity
Controls not operating correctly Check wiring and operation
Refrigerant shortage
Check for leaks. Recover, repair, evacuate
and recharge
Indoor coil dry or partly sweating Dirty condenser Clean fins if necessary
E Indoor coil frosting Refrigerant shortage
Check for leaks. Recover, repair, evacuate
and recharge
Dirty evaporator fins/filter Clean if blocked
Running in cool ambient without a head
pressure controller
Fit head pressure controller
If room temperature is also low
Controls set too low or cooling
permanently
Reset or replace
F Noisy unit Fan fouling cowl (outdoor unit) Realign fan
Worn motor bearing Replace motor
Casing or piping vibration Check cause and rectify
Loose parts or mounting Find and tighten
Bent fan blade Replace fan
G Water leaking from unit Blocked drain Clear obstruction
Units with condensate pump No supply to pump or loose connection Secure the supply
Fouled sensor Clean sensor
Pumping slowly Check drain pipes; if clear, replace pump
Pump windings shorted Replace pump
H Pump always runs Faulty sensor or pcb Replace sensor or pcb
I No heating Controls not set for heating Reset
Unit wiring fault Check wiring and connections
Dirty evaporator fins/filter Clean
Faulty controls Check for signal; replace if faulty
Faulty heater element/element not fitted Replace
Faulty heater cutout Replace, (check for short circuiting)
Reversing valve jammed A light tap may free it; preferably replace
J
Overload tripped on three phase
units
High voltage supply Max rated voltage 254v -- check supply
Compressor failure Replace
Fuses blown
Replace fuses and investigate reason for
fuses blowing
K Outdoor unit does not operate No mains supply
Check fuse rating and replace. Check for
loose electrical connections
Supply below 187v Check supply
Isolator off Turn isolator on
Internal fuse blown Check fuse and replace
No command signal Check indoor unit
Off cycle delay operating Wait in cooling for 3 minutes
Check no alarms exist
If NO external connections are made to alarm terminal 5, the presence of an alarm condition can be tested for by checking
for mains voltage at terminal 5; full mains voltage = Alarm; less than mains voltage = Clear.
The outdoor unit can be caused to operate for test purposes by temporarily linking live directly to terminal 3
(up to 20 seconds delay)
-39-
L
Outdoor unit runs continually at high
speed
Charge link still fitted Remove charge link
HPUL in heating Normal
Minimum speed adjustment set too high Reset minimum speed
If all external devices test O.K. the outdoor unit pcb must be replaced
M No LED's lit or flashing
Unit commanded to be OFF Transmit 'ON'
No mains supply or internal fuse blown.
(Fuse F2 on internal control board blown
during configuring)
Check electrical supply and fuses
Fan motor plug disconnected Reconnect fan motor plug
Motor internal thermal protector operated Check motor and rectify
Cables to fascia not connected Reconnect
Circuit board fault Check circuit board and replace
High water level Check pump circuit (if fitted)
N All LED's lit, one flashing
Temperature sensor problem See table below
Resistor problem (non HPUL) Check resistor connected
Outdoor sensor problem (HPUL)
Replace outdoor unit sensor/check
interconnecting wiring
P
Indoor unit continues after stop/off
command
NORMAL: Overrun of 30 seconds in
heating
Q
Unit will not respond to infrared
commands.
No audible answer signal
Battery discharged Replace battery
Handset corrupted Reset
R
Unit does not switch on/off at
intended times
Power cut has occurred
Send any command from the handset to
synchronise the timer
S
Unit not running in intended
mode/temperature
Power has been shut off for three or more
days, unit is exercising default programme
Use handset retransmit button
T
Fan does not run at the intended
speed
Heat Pumps Only
Fan runs at low speed until indoor coil is
warm, then changes to intended speed
U Short cycles between cool and heat System oversized for room Use cool or heat programmes NOT 'Auto'
V
First operation, room is overcooled
or overheated by 2°C
Set point temperature reverts to normal
after deadband is reached or 20 minutes of
operation
Normal
W Handset will not transmit
Heating commands Incorrectly configured
Any commands Battery flat
X Compressor runs on
Automatic minimum run time of 1.5
minutes
Normal
If problems are encountered check the battery and connections. If the handset fails to respond to button operations, disconnect
and then reconnect the battery. The previous programme state is retained in the memory for a few seconds provided none of the
user buttons are pressed.
DISPLAYS/DIAGNOSTICS
Cool Dry Fan Heat
DIAGNOSTICS
D I4F
Green Red Red Amber
OFF OFF OFF OFF
No power, manual OFF, timed OFF,
condensate high level, fault in condensate
ON OFF OFF OFF Cooling mode selected
ON OFF OFF BLINKS AUTO - predominantly cooling
OFF OFF OFF ON Heating mode selected
BLINKS OFF OFF ON AUTO - predominantly heating
OFF OFF ON OFF Fan mode selected
OFF ON OFF OFF Dry mode selected
OFF OFF OFF BLINKS Outdoor unit defrosting
Diagnostics
BLINKS x 4 OFF OFF OFF Room sensor missing
BLINKS x 4 OFF OFF OFF Indoor coil sensor missing
BLINKS x 4 BLINKS OFF OFF Outdoor coil sensor missing
BLINKS x 1 OFF BLINKS OFF Compressor overload
BLINKS x 2 OFF BLINKS OFF Pump fault
-40-
EXPLODED DIAGRAM OF IMPACT-L WITH COMPONENT IDENTIFICATION
(IMPACT-L 40 SHOWN)
1 Top cover plate 15 Terminal assembly 29 Heater cutout assembly
2 Wall mounting bracket 16 Heater element 30 Electrics plate
3 Back panel 17 Right hand end cover 31 Capacitor
4 De-ice thermostat 18 Right hand door 32 Blank cover (not applicable)
5 Polystyrene scroll 19 Front cover 33 LED cover (electronic)
6 Impeller 20 Filter 34 De-ice sensor (Electronic)
7 Motor 21 Left hand end cover 35 Return air sensor (Electronic)
8 Drip tray assembly 22 Top box assembly 36 Condensate pump
9 Power board (electronic) 23 Coil and header 37 Condensate pump sensor
10 Thermostat (not applicable) 24 Extrusion 38 Condensate pump PCB
11 Rotary switch(not 25 Drip deflector Remote controller (not shown)
12 Right hand coil bracket 26 Left hand coil bracket 2 Amp fuse (not shown)
13 Receiver board (electronic) 27 Rubber housing Heater relay (not shown)
14 Rotary knob 28 Impeller spring
-41-
MCU(+) 15 - 100/MHPUL 15 - 90 COMPONENT IDENTIFICATION
1 Lid 13 Service valve (liquid) 25 Support bracket
2 Contactor 14 Service valve 26 Fan / motor assy
3 Overload 15 Valve panel 27 End clamp
4 Heat exchanger 16 Base 28 Terminal (screw - screw )
5 Rear access panel 17 Mounting foot 29 Fuse
6 Mains terminal cover 18 LP switch 30 Fuse terminal
7 Fan capacitor 19 Compressor 31 Terminal (4 way)
8 Bulkhead panel 20 Handle 32 Earth terminal
9 HP switch (manual, option) 21 Front access panel 33 Head pressure control pcb (MCU+
10 Suction accumulator (MHPUL,) 22 Fan guard 34 3 minute timer pcb (MCU+ MHPUL)
11 Reversing valve (MHPUL) 23 Fascia panel 35 Compressor capacitor
12 Expansion assy (inc. restrictor) 24 Corner panel 36 Electrics box
-42-
DCUE COMPONENT IDENTIFICATION
1 Lid 17 Water level sensor
2 Fan assembly 18 Expansion assembly
3 Panel right hand access 19 Service valve
4 Accumulator 20 Panel electrics access
5 Spire c lip 21 Handle
6 Switch LP auto 22 Service valve
7 Switch HP auto 23 Isolator
8 Terminal 4 way 24 End clamp
9 Terminal fused 25 Terminal
10 Compressor 26 Reversing valve (DHPUE)
11 Crankcase heater 27 Solenoid
12 Cover sump housing 28 Power board
13 Condensate pump pcb 29 Overload (3ph)
14 Condensate pump 30 Contactor
15 Filter 31 Fan capacitor
16 Condensate sump 32 Compressor capacitor (1ph)
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