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CU/CFCU

Condensing Units

Installation & Maintenance Manual : 6259626 IM V1.6.0 04/16

Troubleshooting

FAULT

POSSIBLE CAUSE

REMEDY/ACTION

Unit Will Not Start

No power.

Check power supply to the controller.

Wired incorrectly.

Check wire connections in accordance with
wiring diagram on control box lid.

Loose wires.

Check all wires, connections, terminals etc.

CU./CUH. 1- 4 Only

Microprocessor failure.

If fans can be operated by bypassing the
microprocessor, then the microprocessor is
faulty and requires replacing/investigation.

Compressor not operating

No power to compressor

Check isolator, fuses, MCBs, contactor and
control circuit wiring

Low pressure switch operated (if fitted)
(large or complete loss of
refrigerant charge).

Repair leak and recharge system - if
completely out evacuate before charging.

Condenser fan thermal trip open circuit.

Investigate and correct.

Seized compressor, possibly due to lack of
oil (piston/crank seizure) broken valve reed
jamming piston etc).

Replace compressor - investigate oil
trapping and general installation.

Defective compressor motor.

Check winding resistances - replace
compressor. If burnt out follow burn out
procedure using suction line burn-out drier.

Noisy Compressor

Expansion valve malfunction (abnormally
cold suction Iine).

Ensure feeler bulb is tight on suction and
superheat is correct (normally 5 to 6°C).
Replace power assembly or valve
as necessary.

Lack of oil.

Repair leaks if any, add oil if required but not
too much. Investigate pipe system and
trapping. If no oil still, drain compressor and
measure in correct quantity.

Broken or damaged compressor valve reed
(compressor knocking).

Replace compressor (possible other
symptom is that it will have high suction
pressure).

Worn or scored compressor bearing.
(excessive knocking).

Replace compressor.

Head Pressure too high/HP
cut-out operated

Condenser coil clogged or dirty.

Clean condenser.

Overcharge of refrigerant. Normally
troublesome in warm weather.

Remove excess refrigerant from system.

Air or other non-condensable gas in system. Evacuate system and re-charge with new

refrigerant.

Head pressure controller faulty.

Check fan speed controller - if
faulty - replace.

Fan not operating or operating inefficiently. Check motor - if faulty - replace.

CFCUS Units - Head pressure
damper seized.

Free off and lubricate.

Head pressure too low

Fan operating too fast in low
ambient conditions.

Check fan speed controller adjustment - if
faulty - replace.

Содержание CFCUS 5-10

Страница 1: ...I N S T A L L A T I O N M A I N T E N A N C E M A N U A L Condensing Units CU 1 1 5 CUH 1 1 5 CUS 2 12 CUHS 2 12 CFCUS 5 10 ...

Страница 2: ...ase contact our Training Co ordinator CUSTOMER SERVICES For further assistance please e mail enquiries airedale com or telephone CUSTOM ER SER VIC ES UK Sales Enquiries 44 0 113 238 7789 uk sales airedale com International Enquiries 44 0 113 239 1000 enquiries airedale com Spares Hot Line 44 0 113 238 7878 spares airedale com Airedale Service 44 0 113 239 1000 service airedale com Technical Suppor...

Страница 3: ...mensions Positioning Weights 10 REFRIGERATION INFORMATION 13 Refrigerant Pipework Schematics 13 Unit Charge 13 Pipe Sizing Guide 13 Pipework Installation 13 Pressure Testing 14 Evacuation 14 Alternative Refrigerants 14 ELECTRICAL INFORMATION 15 Electrical Data CU CUH 1 4 15 Electrical Data CUS CUHS 5 12 15 Electrical Data CFCUS 5 10 16 Interconnecting Wiring 16 COMMISSIONING 19 Pre Start Checks 19...

Страница 4: ...w noise paddle type blades and inlet ring The external rotor motor allows the use of a low power output single phase speed controllable motor to power the fan The motor has inbuilt thermal overload protection and the assembly is supplied complete with a finger guard for protection CFCUS 5 10 Comprises a forward curved centrifugal fan belt driven by a totally enclosed 3 phase motor mounted on a sli...

Страница 5: ...factory fitted pressure actuated head pressure controller which varies the speed of the fan s to provide optimum control under varying ambient conditions CFCUS 5 10 Head pressure is maintained by a factory fitted set of pressure actuated opposed blade dampers which modulate to provide optimum control under varying ambient conditions OPTIONAL EXTRAS Epoxy Coated Coils In atmospheres where high corr...

Страница 6: ...y competent and trained personnel in accordance with local relevant standards and codes of practice 5 Refrigerant used in this range of products is classified under the COSHH regulations as an irritant with set Occupational Exposure Levels OEL for consideration if this plant is installed in confined or poorly ventilated areas 6 A full hazard data sheet in accordance with COSHH regulations is avail...

Страница 7: ...ding Airedale s part number if known The original equipment serial U or BP number An appropriate purchase order number A spares order will be raised under our G number system and the replacement part will be despatched usually within 24 hours should they be in stock When replaced the faulty part must be returned to Airedale with a suitably completed and securely attached Faulty Component Return FC...

Страница 8: ... Pipework sizes and routes should be set in accordance with good refrigeration practice Pipework and electrical connections are readily accessible Where multiple units are installed due care should be taken to avoid the discharge air from each unit adversely affecting other units in the vicinity WALL MOUNTING CU CUH 1 4 When condensing units are wall mounted due care should be taken to choose a po...

Страница 9: ...UHS 5 6 7 5 10 12 Nominal Capacity Cooling 1 kW 13 70 17 90 21 00 27 40 35 70 Nominal Airflow m s 2 00 2 00 2 25 4 45 4 45 Max Fan Speed rpm 930 930 930 930 930 Refrigerant Design Type R407C Unit Refrigerant Charge kg 2 40 2 40 3 63 4 76 4 76 Oil Charge Compressor l 1 55 1 65 3 25 3 80 4 00 Liquid Line Conn in F 1 2 F 5 8 F 5 8 F 7 8 F 7 8 F Flare Suction Line Conn in F 7 8 S 1 1 8 S 1 1 8 S 1 1 8...

Страница 10: ...95 59 0 kg CUS2 mm 937 843 395 60 2 kg CUS2 5S T mm 937 843 395 75 7 kg CUS3 mm 937 1130 395 88 1 kg CUS3 5 mm 937 1130 395 101 6 kg CUS4 mm 937 1130 395 104 1 kg CUH1 mm 937 843 395 53 0 kg CUH1 5 mm 937 843 395 61 0 kg CUHS2 mm 937 843 395 61 8 kg CUHS2 5S T mm 937 843 395 78 4 kg CUHS3 mm 937 1130 395 83 6 kg CUHS3 5 mm 937 1130 395 106 0 kg CUHS4 mm 937 1130 395 109 4 kg 1 Incoming Electrical ...

Страница 11: ...699 1441 193 610 193 1409 168 0 kg CUHS6 mm 996 699 1441 193 610 193 1409 171 0 kg CUHS7 5 mm 996 699 1441 193 610 193 1409 222 5 kg 1 Coil to this face on the CUS CUHS 7 5 model only 2 Incoming Electrical Service holes 3 x 20mm Ø to rear of unit CUS CUHS 10 12 A E D F G C B 12 7mm Fixing Slots 500mm 500mm 600mm AIRFLOW MINIMUM CLEARANCE Models Dimensions A B C D E F G Operating Weights CUS10 mm 8...

Страница 12: ... mm 557 557 824 824 G mm 16 16 19 19 H mm 1238 1238 1524 1524 J mm 1206 1206 1486 1486 K mm 203 203 224 224 L mm 610 610 701 701 M mm 161 161 194 194 N mm 560 560 700 700 P mm 160 160 160 160 1 Incoming Services Connections to left hand side of unit compressor compartment 2 Airflow and Maintenance Clearance Please allow 500mm around the unit for airflow and maintenance purpose 3 Dimensions D E M N...

Страница 13: ...S 5 12 The units are shipped with a holding charge of inert gas to guard against contamination or moisture during shipping and storage The charge should be check to indicate if leaks are present prior to evacuation If the charge appears to be either partially or totally lost then the unit should be carefully checked for signs of physical damage PIPE SIZING GUIDE It is important that the correct si...

Страница 14: ...e LP switch if fitted must be disconnected for pressures above 17bar 250 psig Record the pressure over a minimum of 60 minutes to detect major leaks a 24 hour period should preferably be allowed If a reduction in pressure is detected trace the leak and repair before conducting a further pressure test and charging EVACUATION Evacuation for systems operating with R407C refrigerant to be carried out ...

Страница 15: ...aximum Start Amps A 35 0 59 0 49 6 78 6 39 1 46 6 56 7 67 0 Control Circuit VAC 230 230 230 230 230 230 230 230 Mains Supply V 230 1 50 400 3 50 Rec Mains Fuse A 16 16 16 20 16 16 16 20 Max Incoming Mains mm 6 6 6 6 6 6 6 6 Compressor Motor Rating kW 1 1 1 7 1 7 2 5 2 5 2 9 3 7 4 0 Nominal Run Amps 1 A 5 5 9 4 9 6 13 6 5 7 6 4 7 8 8 2 Locked Rotor Amps A 37 5 61 0 47 0 76 0 36 5 44 0 51 0 61 8 Cra...

Страница 16: ...d on 5 C evaporating temperature and a 30 C ambient INTERCONNECTING WIRING Microprocessor Controlled AD05 L1 N Mains Incoming 230 1 50 E S1A Communication Connection S1B To Indoor Unit Microprocessor Only COOL COM HEAT External Control of Cool Heat mode Volt Free 1 A3 Optional Auxiliary Alarm A3 Volt Free Input Normally Closed Healthy DS1 Defrost Status Indication DS2 Volt Free Contact Normally Cl...

Страница 17: ...oming 230 1 50 or 400 3 50 N E 34 Compressor Signal From Indoor Unit 35 Cooling Signal From Indoor Unit 36 Defrost Signal From Indoor Unit 589 502 589 502 Volt Free Contact for Unit Trip Indication CUH 1 4 N1 Control Neutral if required CUS5 12 CFCUS 5 10 L1 L2 Mains Incoming 400 3 50 L3 N E 576 577 Cooling Signal From AHU 24 Vac 502 CUS 5 12 CFCUS 5 10 589 Volt Free Contacts for unit Trip Indicat...

Страница 18: ...nsing Units Installation Maintenance Manual 6259626 IM V1 6 0 04 16 pLAN Termination The plugged termination ensures that the connections are made simultaneously Failure to attach the cables this way may cause damage to the controller ...

Страница 19: ...ration REFRIGERATION 1 The unit condition is satisfactory 2 All pipework is complete and insulated where necessary 3 All fans are able to rotate freely 4 The system has been evacuated correctly 5 Check the operation of the high and low pressure switch settings if fitted These should be as follows HIGH PRESSURE SWITCH 27 Bar 400 psi CUT OUT LOW PRESSURE SWITCH 0 5 Bar 7 psi CUT OUT 2 5 Bar 37 psi C...

Страница 20: ...elect Cooling mode on the indoor unit and check for no continuity between the COOL and COM terminals on the microprocessor 7 The compressor should switch off 8 Switch off mains power and reconnect compressor power wiring Heat Pump Units Follow steps 1 7 above and then check heating operation as described below 1 Select heating mode on the indoor unit and check for continuity between the HEAT and C...

Страница 21: ...E ONLY ADDING REFRIGERANT CU CUH 1 4 Supplied pre charged for up to 7m pipe runs equivalent length please refer to the table below for additional charging guidance CUS CUHS 5 12 CFCUS 5 10 Supplied with a holding charge the charge in the Technical Data tables is based on approximately 30m pipe runs equivalent length The following approximate amounts should be added to the system for every addition...

Страница 22: ...inlet grilles of the indoor unit and observing the outdoor unit fan slowing down IMPORTANT FINALLY AND MOST IMPORTANT Fill in the commissioning sheet and return a copy to the factory to ensure that the warranty on the unit will be valid ALARM DIAGNOSTIC OPERATION CU CUH 1 4 Unit control is via a microprocessor board found inside the control panel of the unit The board features 4 Red LED alarm indi...

Страница 23: ...m Evacuate system and re charge with new refrigerant Head pressure controller faulty Check fan speed controller if faulty replace Fan not operating or operating inefficiently Check motor if faulty replace Compressor short cycles or LP cut out operated LED 1 On LP switch faulty if fitted Check cut out pressure and replace if necessary Dirty indoor unit filters Replace Dirty or icing evaporator redu...

Страница 24: ... compressor If burnt out follow burn out procedure using suction line burn out drier Noisy Compressor Expansion valve malfunction abnormally cold suction Iine Ensure feeler bulb is tight on suction and superheat is correct normally 5 to 6 C Replace power assembly or valve as necessary Lack of oil Repair leaks if any add oil if required but not too much Investigate pipe system and trapping If no oi...

Страница 25: ...alve Investigate for refrigerant leaks repair and re charge system Clogged filter drier pressure temperature drop across it Replace Obstruction in liquid line solenoid valve Inspect clean or replace Obstruction in expansion valve Inspect clean or replace Defrost cycle not initiating Unit set for cooling only Check links Condenser fan not operating power on Power supply failure Check power supply a...

Страница 26: ...rect Adjust as necessary Incorrect pressure sensor setting Adjust sensor screw as necessary Faulty Fan Speed Controller Replace controller and sensor as they are matched sets Faulty pressure sensor Replace controller and sensor as they are matched sets Condenser fans runs only slowly Incorrect pressure setting Adjust sensor screw as necessary Faulty Controller Replace controller and sensor as they...

Страница 27: ...g a service gauge manifold and compare them with the commissioning sheet If there is any significant variation then the fault should be found and corrected Refer to Troubleshooting 3 Check that the high and low pressure switches if fitted are cutting out the compressor s at the commissioned settings 4 Ensure the fan head pressure controller is controlling the head pressure at the required setting ...

Страница 28: ...CU CFCU Condensing Units 28 Condensing Units Installation Maintenance Manual 6259626 IM V1 6 0 04 16 Notes ...

Страница 29: ...Condensing Units CU CFCU Condensing Units 29 Installation Maintenance Manual 6259626 IM V1 6 0 04 16 ...

Страница 30: ...d Leeds Road Rawdon Leeds LS19 6JY United Kingdom Tel 44 0 113 239 1000 Fax 44 0 113 250 7219 e mail enquiries airedale com website www airedale com PART NO ISSUE DATE 904 038 IM E A 01 11 00 B 01 01 03 C 01 03 03 V1 3 0 18 02 13 V1 4 0 10 2014 V1 5 0 12 2015 V1 6 0 04 2016 ...

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