impact / impact e wall mounted units technical manual - Heronhill Air ...

IMPACT / IMPACT E WALL MOUNTED UNITS 

TECHNICAL MANUAL 

53799173-05

INDEX 

CONTENTS 

PAGE 

GENERAL. 2 

PART NUMBERS, DIMENSIONS & WEIGHTS, FEATURES & ACCESSORIES, UNIT 

COMBINATIONS. 

3 

SYSTEMS & PERFORMANCE, ELECTRICAL HEATING, AIR FLOWS. 4 

SOUND POWER AND SOUND PRESSURE LEVELS, ELECTRICAL DATA. 5 – 6 

ELECTIRAL LOADS. 6 - 7 

UNIT INSTALLATION. 7 - 9 

APLLICATION, RESTRICTORS. 10 - 11 

PIPE CONNECTIONS. 12 

ELECTRICAL CONNECTIONS. 13 

E REMOTE CONTROLLER. 14 

WIRING DIAGRAMS. 15 - 18 

EXPLODED VIEW, COMPONENT IDENTIFICATION. 19 

GENERAL 

1. TEV Ltd recommend that personnel working on this equipment be skilled and fully conversant with 

the appropriate Air Conditioning, Refrigeration and Electrical practices and have sound knowledge 

of current Industrial Safe Working practices. 

2. The impact wall mounted range of split systems comprises of 537 series impact wall mounted 

indoor units, 550 series condensing units and 551 series heat pump outdoor units, or 542 series 

ducted condensing units and 543 series electronic ducted heat pump units. By choosing 

appropriate combinations the installer can provide: 

a. Air conditioners with a cooling range of 1.6 – 9.9 kW. 

b. Heatpump systems with a cooling range of 2.0 – 8.6kW, and a heating range of 

1.9 – 9.4kW with an outdoor temperature of minus 1°C. 

3. These units contain live electrical components, moving parts and refrigerant under pressure. 

Always site out of reach of children and protect from vandalism. 

4. The data plate only gives information for the impact unit. For system details add input power and 

current of indoor and outdoor unit, including any heater load. 

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PART NUMBERS 

Electromechanical Models IMPACT 20 IMPACT 40 IMPACT 60 

Part Number 53700001 53700002 53700003 

Electronic Models IMPACT 20E IMPACT 40E IMPACT 60E 

Part Number 53700011 53700012 53700013 

DIMENSIONS AND WEIGHTS (for dimensions, weights and sizes of outdoor units refer to outdoor 

unit technical manual) 

IMPACT INDOOR UNITS (unpacked) 

Model 

IMPACT 

20(E) 40(E) 60(E) 

HEIGHT mm 490 490 490 

WIDTH mm 550 850 1150 

DEPTH mm 204 204 204 

WEIGHT kg 14 18 24 

IMPACT INDOOR UNITS (packed) 

Model 

IMPACT 

20(E) 40(E) 60(E) 

HEIGHT mm 616 616 616 

WIDTH mm 720 1020 1320 

DEPTH mm 290 290 290 

WEIGHT kg 16 20 27 

FEATURES / ACCESSORIES 

IMPACT IMPACT (E) 

Adjustable air deflectors STD STD 

De-ice thermostat * STD 

Electric heating * * 

Electromechanical thermostat STD --- 

3 fan speeds STD STD 

Remote hard wired control --- STD 

Remote infrared control --- STD 

Network / Multisplit control --- STD 

Programmable timer * STD 

Condensate pump * * 

Long life washable filter STD STD 

Flame retardant material STD STD 

High or low level mounting STD STD 

KEY: * = factory/site option STD = standard --- = not available 

UNIT COMBINATIONS 

AIR CONDITIONING SYSTEMS 

HEAT PUMP SYSTEMS 

IMPACT MCU+ / DCU+ IMPACT MHPUE / DHPUE 

20 (E) 15 20 (E) 15 

40 (E) 30 / 40 40 (E) 30 

60 (E) 40 / 60 60 (E) 50 

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AIR CONDITIONER SYSTEMS AND PERFORMANCE (kw) 

UK CONDITIONS 

ROOM 21°C/15°C 

AMBIENT 27°C/19°C 

NEMA (EUROVENT) 


AMB 35°C/24°C 

TROPICAL 


AMB 46°C/24°C 

IMPACT + MCU+ 

or DCU+ 

MIN SPEED EVAP MAX SPEED EVAP MAX SPEED EVAP MAX SPEED EVAP 

TOTAL SHR SENS TOTAL SHR SENS TOTAL SHR SENS TOTAL SHR SENS 

20(E) + 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 

40(E) + 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 

40(E) + 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 

60(E) + 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 

60(E) + 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 

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 

1. 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 / MHPUE or DHPUE TOTAL SHR SENS TOTAL SHR SENS TOTAL SHR SENS 

20E - 15 1.2 0.75 0.9 1.7 0.81 1.4 2.0 0.78 1.6 

40E – 30 2.2 0.78 1.7 3.0 0.83 2.5 3.3 0.85 2.8 

60E - 50 3.5 0.72 2.6 4.8 0.82 3.9 5.3 0.81 4.3 

2. Heating, (room 20°C / 12°C, outdoor unit fan at MAX speed). (kW) 

HEATING OUTPUT AT 7°C AMBIENT HEATING OUTPUT AT -1°C AMBIENT 

MAX SPEED INDOOR FAN 

MAX SPEED INDOOR FAN 

IMPACT / MHPUE or DHPUE kW COP kW COP 

20E – 15 2.3 2.23 1.9 2.00 

40E – 30 4.0 2.78 3.1 2.30 

60E - 50 5.4 2.60 4.3 2.20 

OPTIONAL ELECTRIC HEATING 

IMPACT 

at 230V 50Hz 

(kW) 

at 240V 50Hz 

(kW) 

20(E) 0.7 0.8 

40(E) 1.4 1.5 

60(E) 2.1 2.25 

80(E) 2.75 3.0 

100(E) 3.2 3.5 

AIRFLOWS IMPACT UNITS 

MIN Speed MED Speed MAX Speed 

IMPACT CFM M³/S CFM M³/S CFM M³/S 

20(E) 125 0.06 170 0.08 210 0.10 

40(E) 275 0.13 345 0.16 420 0.20 

60(E) 360 0.17 440 0.21 645 0.30 

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SOUND POWER AND SOUND PRESSURE LEVELS 

IMPACT UNITS 

SOUND POWER LEVELS 

Frequency Hz 

5/20 

SOUND PRESSURE LEVELS 

MODEL SPEED 125 250 500 1K 2K 4K dBA dBA NC 

20 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 

40 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 

60 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 

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/m 2 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. 

ELECTRICAL DATA 

R407C AIR CONDITIONING SYSTEMS (MCU+) 

MODEL 

COMBINATION 

Single Phase Supply 230Volts - 50Hz 

Three Phase Supply 400Volts - 50Hz 

INPUT FULL LOAD AMPS 

SYSTEM 


SYSTEM 

MAX. 

MAX. 

STARTING 

Cooling Heating Cooling Heating CURRENT Cooling Heating Cooling Heating STARTING 

CURRENT 

IMPACT + MCU+ kW kW AMPS AMPS AMPS kW kW A/PH A/PH* A/PH 

20(E) + 15 0.9 0.9 6.4 4.0 23 -- -- -- -- -- 

40(E) + 30 1.4 1.7 8.7 7.6 37 1.4 1.7 4.5 7.6 19 

40(E) + 40 1.6 1.7 10.8 7.6 51 1.6 1.7 5.7 7.6 23 

60(E) + 40 1.6 2.5 10.9 11.1 51 1.6 2.5 5.8 11.1 23 

60(E) + 60 2.5 2.5 10.2 10.8 62 2.5 2.5 4.6 10.8 33 

R407C AIR CONDITIONING SYSTEMS (DCU+) 

MODEL 

COMBINATION 




SYSTEM 


SYSTEM 

MAX. 

MAX. 

STARTING 

Cooling Heating Cooling Heating CURRENT Cooling Heating Cooling Heating STARTING 

CURRENT 

IMPACT + DCU+ kW kW AMPS AMPS AMPS kW kW A/PH A/PH* A/PH 

20(E) + 15 1.3 0.9 6.0 4.0 25 -- -- -- -- -- 

40(E) + 30 1.8 1.7 8.4 7.6 37 1.8 1.7 3.6 7.6 19 

40(E) + 40 2.3 1.7 10.6 7.6 51 2.3 1.7 4.8 7.6 24 

60(E) + 40 2.3 2.5 10.7 11.1 51 2.3 2.5 4.9 11.1 24 

60(E) + 60 3.1 2.5 14.3 11.1 61 3.1 2.5 6.0 11.1 26 

R407C HEAT PUMP SYSTEMS (MHPUE) 

MODEL 

COMBINATION 

STD. 

MODEL 



INPUT FULL LOAD AMPS SYSTEM INPUT FULL LOAD AMPS 

MAX. 

+ ELECT STD. + ELECT STARTING STD. + ELECT STD. + ELECT 

Heating MODEL Heating CURRENT MODEL Heating MODEL Heating 

SYSTEM 

MAX. 

STARTING 

CURRENT 

IMPACT + MHPUE kW kW AMPS AMPS AMPS kW kW A/PH A/PH* A/PH 

20(E) + 15 0.9 1.7 6.4 9.9 31 -- -- -- -- -- 

40(E) + 30 1.4 3.0 8.7 15.7 42 1.4 3.0 4.5 11.5 26 

60(E) + 50 2.1 4.5 9.5 19.9 61 2.1 4.5 4.6 15.0 33 

* Max Phase 

53799173-05

R407C HEAT PUMP SYSTEMS (DHPUE) 

MODEL 

COMBINATION 

STD. 

MODEL 



INPUT FULL LOAD AMPS SYSTEM INPUT FULL LOAD AMPS 

MAX. 

+ ELECT STD. + ELECT STARTING STD. + ELECT STD. + ELECT 

Heating MODEL Heating CURRENT MODEL Heating MODEL Heating 

SYSTEM 

MAX. 

STARTING 

CURRENT 

IMPACT + DHPUE kW kW AMPS AMPS AMPS kW kW A/PH A/PH* A/PH 

20(E) + 15 1.3 2.2 4.6 8.1 23 -- -- -- -- -- 

40(E) + 30 1.8 3.5 9.1 16.1 46 1.7 3.5 3.9 10.9 28 

60(E) + 50 2.5 5.0 11.7 22.1 65 2.5 5.0 5.3 15.7 38 

* Max Phase 

ELECTRICAL LOADS (230V 50Hz 1Ph, A or 400V 50Hz 3PhN, A/Ph) 

IMPACT 

20E 40E 60E 

FAN MOTOR 0.2 0.3 0.4 

ELECTRIC HEATER (AIR COND.) 3.5 7 10.4 

ELECTRIC HEATER (HEAT PUMPS) 3.5 7 10.4 

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 (230V) OUTDOOR UNITS (A) 

IMPACT (E) 

MCU+ or 20 40 60 

DCU+ S H S H S H 

15 16 16 

30 16 16 

40 20 20 20 20 

60 20 20 

MHPUE or 

DHPUE 

S H S H S H 

30 10 16 

50 20 20 

S = Standard H = Heaters 

FUSES FOR SYSTEMS WITH THREE PHASE (400V) OUTDOOR UNITS (A/Ph) 

MCU+ or 

IMPACT (E) 

40 60 

DCU+ S H S H 

30 10 10 

40 10 10 16 16 

60 10 16 

MHPUE or 

DHPUE 

S H S H 

30 10 16 

50 10 16 

S = Standard H = Heaters 

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SEPARATE SUPPLIES TO ELECTRONIC INDOOR AND OUTDOOR UNITS (A) 

HEAT PUMP SYSTEMS ONLY 

It is recommended that systems using electronic indoor AND outdoor units should be independently fused. 

NOTE THAT THESE SUPPLIES MUST BE TAKEN FROM THE SAME PHASE 

IMPACT E 

20 40 60 

1Ph Cool Only 5 5 5 

1Ph Cool and Heat 5 10 10 

OUTDOOR UNIT 

MHPUE 15 

DHPUE 15 

MHPUE 30 

DHPUE 30 

MHPUE 50 

DHPUE 50 

1Ph (A) 10 16 20 

3Ph (A/Ph) --- 10 10 

IMPACT (E) WALL MOUNTED UNIT INSTALLATION 

The installer supplies: 

Unpacking 

• 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. 

Carefully unfasten the banding and lift off the outer cardboard carton sleeve. 

The following are supplied: 

• IMPACT 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. 

• IMPACT E models also have an electronic remote control assembly incorporating the infrared 

controller, wall mounting bracket, two screws and wall plugs and a battery. 

1 Remove and place to one side the cardboard sleeve containing the two pipe 

assemblies, (and remote control assembly on IMPACT E models). 

2 Lift the IMPACT 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 two polystyrene end 

caps and the protective sleeve from the IMPACT 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. 

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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. 

INSTALLATION AND SERVICE ACCESS 

CEILING 

30mm 

minimum 

LEFT 

HAND 

WALL 

RIGHT 

HAND 

WALL 

To allow 

top box 

removal 

Model 

Weight 

kg 

Operating 

Weight 

kg 

20(E) 14 15 

40(E) 18 21 

60(E) 24 25 

*Includes all kits and refrigerant 

200mm 

minimum 

FLOOR 

(*Unless heaters fitted) 

200mm* 

minimum 

150mm 

minimum 

(screwdriver 

access) 

*Removal or replacement of heater elements requires a clearance at the right hand side equal to the 

length of the unit 

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 or 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. 

Model 20E 40E 60E 

A1 445 745 1045 

A2 395 695 995 

A3 345 645 945 

B 370 370 370 

C 340 340 340 

D 31 31 31 

E 29 29 29 

A1 

A2 

A3 

C 

B 

D 

E 

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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 overflow protection) can be fitted within the unit to enable a lift of up to 

5m. 

Air Deflection 

Air deflection is set by manually adjusting the vanes. The unit is supplied with front discharge but can 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. 

TABS 

AIR 

AIR 

DEFLECTOR AS 

SUPPLIED FOR 

FRONT DISCHARGE 

MOVE DEFLECTOR 

TO ALTERNATIVE 

POSITION 

TURN TOP BOX 

THROUGH 180° AND 

SNAP IN TO SUIT 

TOP DISCHARGE 

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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) oil 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 equivalent lengths of all the fittings in a particular pipe run must be added together and the total 

added to the actual length of pipe in the run, in order to calculate 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 = 0.73 0.91 1.10 1.28 1.46 1.83 

180° Bend C/d = 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 

5 Use the shortest possible route, avoiding sharp bends. 

6 Fully insulate both the suction and expansion lines, including the expansion device, since both lines 

may sweat. 

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RESTRICTOR MATCHES 

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. 

Where appropriate, the alternative cooling or heating restrictor is supplied with either the indoor or the 

outdoor unit 

SYSTEM 

MATCH 

PIPE CONNS MAXIMUM PIPE RUNS (m) COOLING RESTRICTOR 

MCU+ 

DCU+ 

SUCTION 

EXPANSION 

SUC EXP 

UK + 

3/8 1/2 5/8 3/4 7/8 11/8 

UK NEMA 

3/8 1/2 5/8 

NEMA 

CHARGE TO 

ADD 

(for 7.5m) (1) 

UK 

(g) 

NEMA 

(g) 

IMPACT 20 3/8 3/8 

MCU+15/ 

DCU+ 15 

3/8 3/8 

IMPACT 40 1/2 3/8 

MCU+30/ 

DCU+ 30 

1/2 3/8 

IMPACT 40 1/2 3/8 

MCU+40/ 

DCU+ 40 

1/2 3/8 

IMPACT 60 5/8 3/8 

MCU+40/ 

DCU+ 40 

1/2 3/8 

IMPACT 60 5/8 3/8 

MCU+60/ 

DCU+ 60 

5/8 3/8 

7.5 30 50 50 033 035 032 200 230 

15 50 80 50 80 040 042 039 0 60 

10 36 80 7.5 80 042 044 041 140 240 

10 36 80 7.5 80 042 044 043 200 300 

14 36 80 7.5 50 80 051 053 050 0 635 

D 

Restrictor / Orifice / Düse 

HEAT PUMP SYSTEMS (ALL CONDITIONS) 

Heat pumps are supplied with a heating restrictor in an expansion assembly. This must be fitted 

close to the indoor unit in the expansion line, (smaller of two connections) arrows pointing in the 

direction of the outdoor unit. 

= NO RESTRICTOR CHANGE 

NEEDED 

Cooling restrictor Heat pump cooling conditions 

Heating restrictor 

MHPUE IMPACT Fitted to the 

outdoor unit 

UK 

CONDITIONS 

NEMA 

CONDITIONS 

fitted to the outdoor 

expansion assembly 

15 20 033 035 035 

30 40 040 042 039 

50 60 052 044 

Cooling restrictor Heat pump cooling conditions 

DHPUE IMPACT Fitted to the 

outdoor unit 

UK 

CONDITIONS 

NEMA 

CONDITIONS 

15 20 032 027 

30 40 039 037 

50 60 049 044 

DHPUE 

MHPUE 

E 

11/20 

53799173-05

PIPE CONNECTIONS 

IMPACT 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 20(E) 40(E) 60(E) 

Expansion Pipe 3/8 3/8 3/8 

Suction Pipe 3/8 1/2 5/8 

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 next section. 

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 pipe 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 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. 

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ELECTRICAL CONNECTIONS 

1 Mains, control and interconnecting cables must be supplied and fitted by the installer. 

2 Installer wiring must be carried out in accordance with IEE regulations and local codes. Refer to the 

interconnecting wiring diagrams on pages 30 to 34. 

3 Mains supply cables must be size compatible with the recommended fuse for a given system (see 

pages 11 and 12). 

4 An all pole isolator switch should be positioned within easy reach of the indoor unit. 

5 The equipment must be earthed. 

6 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. 

ELECTROMECHANICAL SYSTEMS 

Systems including an electromechanical unit require a supply to the condensing unit with connecting cables 

run to the indoor unit 

ELECTRONIC SYSTEMS (DCU+, DHPUE and MHPUE): 

It is recommended that systems with electronic indoor AND electronic outdoor units have a supply taken to 

the outdoor unit AND a separate supply taken to the indoor unit, which in many cases can be from a 

domestic 13 Amp socket, (see fuse ratings on pages 11 and 12), otherwise run a supply to the outdoor unit 

with connecting cables run to the indoor unit. 

Communication between the indoor and outdoor unit is via a two wire (max. 0.75mm 2 ) non-polarised 

connection (installer supplied), using cable type RS 485 or equivalent, (or two cores of 00526077, 4 core 

cable, available from TEV Ltd). 

The cable screen should be secured to ground (earth) at BOTH ends using the clamps provided. Do 

not attempt to run the communication in the spare cores of any power carrying cable. 

Whenever possible, the communication cable should be run separate from any mains cable. 

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. 

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), and open 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). 

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ADDING REFRIGERANT 

1 If additional refrigerant charge is required: 

After evacuating the indoor unit and interconnecting pipework, open the valves using a 4 or 5mm Allen key. The 

high and low side pressures should equalise within a minute. 

2 Additional charge for all systems, including heat pumps, should be introduced with the system in the AIR 

CONDITIONING MODE. 

3 Additional charge should be introduced through the Schrader valve on the indoor unit or the service port on the 

suction service valve on the outdoor unit (see charging section overleaf to calculate the weight). 

4 DCUE, DHPUE and MHPUE 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, DHPUE or 

MHPUE fans will run at high speed and IMPACT E indoor fans will run at maximum speed. When JP6 is linked, the 

infrared handset is inoperative. 

NOTE: MCU+ units are fitted with head pressure control; before charging, isolate the unit and transfer the blue 

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, DHPUE and MHPUE 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, DHPUE 

and MHPUE 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 possible, 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, DHPUE and MHPUE), 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 could result. 

9 On DCUE, DHPUE and MHPUE 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 1 to 4. 

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. 

CHARGING 

IMPACT WALL MOUNTED SYSTEMS - pipe runs below 7.5m. 

Each outdoor unit is charged with R22 or R407C as shown on page 18. 

Where additional refrigerant is needed this is shown on P18. Additional oil is not required. 

IMPACT 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 18 PLUS additional refrigerant and oil 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 

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INSTALLATION of the IMPACT E REMOTE CONTROLLER 

IMPACT E indoor units are supplied with a remote controller, wall mounting bracket, PP3 (9 volt) battery, 

screws and wall plugs. 

The controller either operates remotely by infrared signals, when the bracket may be used to park the 

controller for convenience, or may be hard wired to the unit (via the wall mounting bracket) in applications 

where infrared is inappropriate, e.g., high lighting level, no direct line of sight etc. 

1. Infrared operation 

Open the battery cover at the bottom rear of the controller by sliding out and hinging up, push the 

polarised connector onto the battery, slot into the controller and close the cover. The controller is now 

ready for operation as stated in the user handbook. 

For convenience, the wall-mounting bracket may be secured to a wall and used to park the controller. 

2 

SCREWDRIVER 

LOCKING CAM 

1 

2. Hard wired 

Use four core screened cable available from TEV Ltd in 100m drums, part number 00526117. The 

screen should be clamped to ground in the IMPACT E unit but NOT connected at the wall bracket end. 

NOTE: Great care should be taken to ensure that the wiring is correct, refer to the diagram 

below 

The cable should be connected prior to mounting the bracket, taking great care to ensure that the 4 

contact blades remain free to exert spring pressure on the handset terminals. 

Secure the bracket to the wall by drilling two 6mm diameter holes in the positions shown, inserting the 

wall plugs and securing with the two screws provided. Attach the controller to the bracket ensuring that it 

is pushed down firmly. 

If required, the controller may be locked into position by rotating the cam at the top of the bracket with a 

small screwdriver. The controller is now ready for operating as stated in the user handbook. The 

controller does not require a battery when this method is used. 

JP15 

4 + 

EARTH AT 

UNIT END 

ONLY 

CABLE 

ROUTING 

1 

- 

Ensure that cables 

are connected correctly 

ie 1 - 1 

2 - 2 

3 - 3 

4 - 4 

1 2 3 4 

BRACKET VIEWED 

FROM THE REAR 

Ensure cables are correctly connected 

ALTERNATIVE CABLE 

ROUTING 

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WIRING DIAGRAMS 

ELECTROMECHANICAL IMPACT 

ELECTRONIC IMPACT E 

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INTERCONNECTING WIRING DIAGRAMS 

20(E) - 60(E) + 1 Phase MCU+ 15 – 60 20E - 60E + 1 Phase MHPUE 15 - 50 

40(E) - 60(E) + 3 Phase MCU(+) 30 - 60 40E - 60E + 3 Phase MHPUE 30 - 50 

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IMPACT 20 –60 and 1 PHASE DCU+ 15 – 60 

IMPACT 20E – 60E and 1 PHASE DCU+/DHPUE 15 - 60 

+ 

+ 

+ 

+ 

+ 

+ ++ 

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IMPACT 40 - 60 and 3 Phase DCU+ 30 - 60 

IMPACT 40E - 60E and 3 Phase DCU+/DHPUE 30 – 60 

+ + + + 

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EXPLODED DIAGRAM OF IMPACT WITH COMPONENT IDENTIFICATION (IMPACT 40 

SHOWN) 

1 Top cover plate 15 Terminal assembly 29 Heater cut-out 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 cover 32 Blank cover (electromechanical) 

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 (e/mechanical) 24 Extrusion 38 Condensate pump PCB 

11 Rotary switch (electromechanical) 25 Drip deflector Remote controller (not shown) 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 (Electromechanical) 28 Impeller spring 

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impact / impact e wall mounted units technical manual - Heronhill Air ...

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