Cairwave Model 7303 Service Manual Issue 7 June 2007

Foreword Foreword Thank you for purchasing Pegasus Ltd. equipment. Your CAIRWAVE Mattress Replacement System is part of a series of quality products designed especially for healthcare environments. We are dedicated to serving your needs and providing the best products available, along with training that will bring your staff maximum benefit from every Pegasus product. Please contact Pegasus if you have any questions about the operation or maintenance of your Pegasus equipment. The expected operational life of your CAIRWAVE Mattress Replacement system is 7 (seven) years from the date of manufacture, providing the following conditions are adhered to: Conditions

• The CAIRWAVE Mattress Replacement system is covered by a 2-year manufacturer’s warranty provided the system is cared for and maintained in accordance with recommended, published “Operating and Product Care Instructions” (LFT4623).

• It is recommended that in addition to the user maintenance, a full annual preventive maintenance is undertaken by a Pegasus trained engineer.

• Pegasus provide a range of maintenance and service contracts specifically designed to meet the essential requirements of the product, whilst providing a degree of flexibility taking account of your particular operational requirements. Contact Pegasus Customer Services Department, details are shown on the back cover.

Information in the manual is crucial to the proper operation and maintenance of the equipment, and will help protect your product and ensure that the equipment performs to your satisfaction. Some of the information in this booklet is important for your safety and must be read and understood to help prevent possible injury. If there is anything in the manual that is confusing or difficult to understand, please call Pegasus Ltd or their appointed distributor (the telephone number appears on the last page of this manual). Symbols used adjacent to the text in these instructions: Danger: Means: - electrical hazard warning, failure to understand and obey this warning may result in electrical shock. Warning: Means: - failure to understand and obey this warning may result in injury to you or to others. Caution: Means: - failure to follow these instructions may cause damage to all or parts of the system or equipment. Note: Means: - this is important information for the correct use of this system or equipment. This product has been designed and manufactured to provide you with trouble free use, however, this product does contain components that with regular use are subject to wear.

• The unit is used in accordance with recommended, published “Operating Instructions” (LFT4623).

and

Product

Care

• The guidelines for product care, must be followed from the first use of the system by the customer.

• The equipment is used for its intended purpose only.

• Only Pegasus designated spare parts should be used, as published in the “Spare Parts” Manual (LFT17185). LFT4622 Issue 7

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Important Safety Information PLEASE READ THIS SECTION PRIOR TO USING YOUR CAIRWAVE SYSTEM The CAIRWAVE system must be used in accordance with these ‘Operating and Product Care Instructions’ (LFT4623)

WARNINGS: Ensure a clinical Risk Assessment is conducted, which should take account of the suitability of use of this product, patient’s condition, any ancillary equipment in use and the surrounding environment. This should include assessing the use of bedframe, siderails, siderail extenders, mattress types, head and footboards etc. Only personnel trained or formally approved by Pegasus in operation and maintenance of Pegasus systems may perform maintenance; modification or repair work on any Pegasus supplied product. Unqualified personnel attempting to work on Pegasus supplied products risk serious injury to themselves and others, and possibly death by electrocution. Do not mount the Patient Management Unit on bedframe linen racks as these are not designed for the purpose and are not sufficiently stable for safe operation. Never cover the Patient Management Unit with bed linen or any other coverings, as this will cause the unit to overheat.

Do not use the equipment in the presence of flammable anaesthetic gases.

Ensure the mains (power supply) cable is not trapped or twisted and is routed suitably to avoid crushing or entrapment when connected to the product. When moving equipment ensure the mains (power supply) cable is disconnected from the mains outlet socket and suitably stowed to avoid any damage whilst transporting equipment. Do not secure mattress straps to removable head or footboards or any fixed (non moving) parts of a profiling bedframe.

The recommended maximum patient weight for this system is 286kg (45st)

Disconnect the Patient Management Unit from the mains supply prior to cleaning. When cleaning do not immerse the Patient Management Unit in water.

CAUTIONS: Materials and procedures used for cleaning may be subject to local health and safety regulations (e.g. OSHA / COSHH Regulations) - these ‘Operating and Product Care Instructions’ (LFT4623) must be followed at all times. Any unauthorised modifications on any Pegasus supplied equipment may affect its safety and are in breach of any warranty on it. Pegasus will not be held responsible for any accidents, incidents or lack of performance that occur as a result of any unauthorised modification to it’s product. When connecting equipment after transportation or storage, inspect the mains (power supply) cable visually for any signs of damage. If evident, do not use equipment and contact Pegasus or your local service provider for repair. When storing the mattress replacement system, ensure the product is stored away from direct sunlight and extreme cold conditions. Ensure the Patient Management Unit is mounted vertically without any obstructions; air ventilation through the PMU is vital for correct and safe operation. Pegasus systems are designed to comply with all relevant electrical safety, manufacturing and performance standards published by ISO and BS.

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Risk Assessment 1. 1.1.

Risk Assessment: Risk Assessment Checklist When open the PMU contains many parts which when connected to the mains supply carry the full mains voltage.

1.1.1 1.1.2 1.1.3 1.1.4 1.1.5 1.1.6 1.1.7

1.1.8 1.1.9

Make sure the work area is adequately sized, suitably lit and at a reasonable temperature. The floor should be free from clutter, unevenness and non-slip. Use good engineering and manual handling practices to reduce risk of injury. Tools and test equipment are to be kept in good condition. You must be adequately trained to perform the task. All systems should be presented for maintenance in a clean, infection free condition. Precautions should be taken when inspecting internal mattress or cushion components as punctured covers could present some level of contamination. Suitable protective garments should be worn. e.g. gloves, disposable aprons etc On completion of maintenance wash hands thoroughly, dispose of all protective disposable garments and clean any tools and / or test equipment which may have become contaminated with appropriate cleaner / disinfectant.

1.1.10 You must comply with all local site safety rules, report all incidents or accidents to the site safety supervisor.

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Product Description 2.

Product Description

The Power Management Unit comprises a housing that has a moulded lid and base secured together by thirteen screws. A hook assembly is attached to the moulded base for securing the PMU to a bedframe.

The system comprises the following major assemblies: •

Alternating Pressure Mattress

•

Power Management Unit (PMU)

The moulded lid incorporates the following:

2.1.

•

Alternating Pressure Mattress

The mattress consists of two decks each having 18 transverse cells interconnected, such that there are three sets of cells - each set being alternately inflated then deflated. A-B-C. The three cells at the head end of the bed on the top deck remain permanently inflated (S). If a Head Zoner is fitted the performance of the three cells at the head end of the top deck can be adjusted.

Mounted inside the PMU is the main chassis assembly. On this chassis are the following:

Figure 1

•

Compressors and Vacuum Pumps: To provide the air pressure and flow required to inflate and deflate the mattress cells.

•

Rotorvalve Assembly: To distribute the air to the correct set of alternating cells.

•

Pressure Switches: To regulate the pressure within the mattress cells. Pre Serial No. 106000 has four pressure switches; post Serial No. 106000 has two pressure switches

•

ECU: To control the system and provide fault data.

There are two side formers that are permanently inflated running the length of the mattress replacement on each side between the two decks. The cells are connected via pneumatic tubing, which is formed into a harness terminating at the umbilical connector. The Mattress has a top and bottom cover that protects it from soiling by body fluids, and has a smooth surface finish to facilitate cleaning.

The air inlet is incorporated in the hook assembly at the rear of the Power Management Unit. The inlet is covered on the inside by a foam filter to prevent ingress of foreign bodies.

The Mattress is connected to the Power Unit via an Umbilical Hose and Connector. The Umbilical has a cover to prevent fluid ingress. The connector is self sealing to allow the Mattress to be transported without deflating. The position of the connector is read by opto-sensors that tell the Power Management Unit which of the modes is required.

2.2.

A status indication panel in the recessed front face of the lid. This panel incorporates a number of LED’s to indicate system status and together with membrane switches to control the various functions of the system.

Power Management Unit (PMU) There are two build standards for the Cairwave Power Management Unit (PMU) pre and post Serial Number 106000

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Product Description 2.3.

Schematic Wiring Diagram (pre Serial Number 106000) The Schematic Wiring Diagram in Figure1 details the main system components for pre Serial Number 106000 PMU’s.

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Product Description 2.4.

Schematic Wiring Diagram (post Serial Number 106000) The Schematic Wiring Diagram in Figure1 details the main system components for post Serial Number 106000 PMU’s.

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Product Description 2.5.

Tubing Charts

Power Management Unit Pre Serial Number 106000

Figure 4

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Product Description Power Management Unit Post Serial Number 106000

Figure 5

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Product Description Alternating Pressure Mattress

Figure 6

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Tools and Test Equipment 3.

Tools and Test Equipment:

3.1.

Required Tools

3.3.

Recommended Spares Holding (per Unit)

Part Number

A general engineering tool kit is required for maintaining the Pegasus Cairwave Mattress Replacement System.

MEC3024

In addition certain test equipment are required as detailed below:

MSM3073

MSM14375

MSM14376 3.2.

Test Equipment

MSM13539 MSM13538 MEC4716 MSM13568 SA852 PIP1961 PIP756

3.2.1. PAC500plus - Electrical Safety Tester. 3.2.2. TE5158 – Service Remote. 3.2.3. TE4466 (Inc TE4540) – Standard Test Kit 3.2.4. SCM4752 – Test Adapter 3.2.5. TE4879 – Pressure Switch Test 3.2.6. TE4739 – Vacuum Switch Test

Description Compressor Filter COMVAC Compressor Filter AIMS Compressor ‘O’ Ring COMVAC Compressor ‘O’ Ring AIMS Accumulator Silencer Case Filter Umbilical ‘O’ Ring Service Kit Silicon Tube 3.5mm I/D Silicon Tube 5mm I/D

Qty 4 4 4 4 1 1 1 10 1 A/R A/R

Further spare parts are detailed in the Spare Parts List LFT17185.

3.2.7. MSM5006 – Extension Lead

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Service Procedure 4.

Service Procedure

The test equipment used for these tasks is to be calibrated and traceable to National Standards.

Preventive Maintenance Schedule It is recommended that the Pegasus CAIRWAVE Mattress Replacement System is part of a planned Preventative Maintenance Schedule. 4.1.

Records and results of these tasks must be retained by the maintainer and / or the user for future reference. 4.3.

Preventative Maintenance (Monthly Schedule)

Power Management System (PMU) (All Serial Numbers)

Pegasus recommend a monthly Preventative Schedule is undertaken by ‘users / operators’ of the equipment to ensure correct operation. Details are contained within the Pegasus CAIRWAVE Mattress Replacement System Operating and Product Care Instructions LFT4623. 4.2.

Preventative Maintenance (Yearly Schedule)

General Prior to carrying out any maintenance or repair, please read ‘Important Safety Statement’ on page 4.

Figure 7 If the System has been running for more than 10,000 hours since the last service the Service Required indicator light will be illuminated, indicating that a full service is required.

Only suitably trained engineering staff should perform the Annual Maintenance Scheduled tasks.

Details of recommended spare parts holding for maintenance / repair are detailed in section 3.3 and a complete list of Spare Parts is detailed in LFT17185

4.3.1. Switch off the Pegasus CAIRWAVE Mattress Replacement System at the mains supply and ensure that the Power Down Alarm sounds. Cancel the Alarm by pressing the Alarm Cancel button on the front panel. If the Alarm does not sound, the ECU Battery requires replacement. (refer to Section 6.2)

4.2.1. Electrical safety checks (earth continuity and insulation) must be carried out prior to working on the equipment and on completion of any routine maintenance or workshop repairs.

4.3.2. Visually check the mains cable for any signs of damage. Replace if necessary. 4.3.3. Check the fuse rating in the mains plug is 3A. Replace if necessary. 4.3.4. Using a suitable portable appliance tester, perform an Electrical Safety Test to ensure the equipment is safe to work on prior to undertaking any maintenance tasks.

4.2.2. Using an Electrical Safety Tester that meets the Technical Specification requirements the following tests must be performed:Earth Continuity

4.3.5. Remove and retain the two allen screws securing the hook assembly to the rear

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Service Procedure cover. Remove and retain the six allen screws securing the rear cover. Carefully remove the cover and hook assembly. 4.3.6. Remove and retain the two allen screws adjacent to the mains input connector. 4.3.7. Remove and retain the 3 allen screws securing the PAC adapter plate to the case. 4.3.8. Disconnect the internal loom from the Status Indicator Panel on the inside of the moulded lid.

Figure 9

4.3.9. Carefully remove the chassis assembly from the case. 4.3.10. Visually check the internal pipework for signs of contamination, deterioration or splits etc. Replace as necessary. 4.3.11. Carefully remove the 10 off ‘O’ rings from the PAC Adapter and replace with new (MSM13568). 4.3.12. Check that the blue rectangular capacitor adjacent to the transformer is an ‘X1’ type, as shown in Figure 8. If it is not contact Pegasus After Sales Technical Support Department on +44(0)2392 784284 who will provide a replacement ECU.

Figure 10 4.3.14. Refer to Figure 11 and remove the pipes from the Silencer and replace the Silencer ensuring that the Velcro strap is secure. 4.3.15. Refer to Figure 11 and remove the pipes from the Accumulator and replace the Accumulator ensuring that the Velcro strap is secure.

Figure 8

Figure 11

4.3.13. If the PMU Serial Number is before 107500 ensure the Varistor Loom (MSM16936) (see figure 9) is in place see (Figure 10). If not present a loom must be fitted in accordance with LFT17032 (MOD17031).

4.3.16. Undo the screws that hold the filter covers on the compressors. Remove and replace both the ‘O’ ring and the filter on each compressor. Ensure the correct filter and ‘O’ ring are used. There are different part numbers for the COMVAC (MEC3024, MSM3073) and the AIMS (MSM14375, MSM14376) compressors.

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Service Procedure

Figure12 4.3.17. Refer to Figure 12 and replace the inlet filter (MEC4716), inside the hook assembly removed earlier.

Figure 14 4.4.3. Visually check the PAC Connector for signs of damage or cracking. 4.4.4. Ensure the reflector disc in the side of the PAC Connector is bright and clean. (Figure 15)

Figure 13 4.3.18. On completion of this service proceed to Section 5.5 and check that the system is functioning correctly. 4.4.

Figure 15 4.4.5. Check the rubber flap valve in the centre of the PAC Connector for signs of damage or deterioration.

Mattress and Umbilical

4.4.1. Visually inspect the Mattress Cover and Umbilical Cover for signs of damage or deterioration. 4.4.2. Visually check the security of all mattress straps to the mattress cover. (Figure 14) It is important to the correct operation of the mattress system when used on a profiling bedframe for these straps to be in the correct position.

Figure 16

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Service Procedure 4.4.6. If a Head Zoner is fitted to the mattress check that the selector is free to move and locks in place. (Figure 17)

Figure 17

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Set Up / Test Procedure 5.

Set Up / Test Procedure

5.1.

Compressor Tests

vibration of the PMU and will shorten the life of other components within the PMU. 5.1.8. Press the Alarm reset button once more and the fill compressors will stop and the vacuum pumps (C3 and C4 Figure 19) will start.

5.1.1. The compressor flow rate test must be undertaken in Service Mode. 5.1.2. Reconnect the status indication panel to the chassis. Extension Lead MSM5006 may be used.

5.1.9. Repeat 5.1.5 to 5.1.7 for the vacuum pumps. Ensure you are connected to the pressure side, not the vacuum side of the pump.

5.1.3. To enter Service Mode, simultaneously press and hold the Normal and Static Buttons on the front panel while switching on. The PMU will ‘beep’ 6 times and the status indication panel LED’s will illuminate in turn. Within 10 seconds the LED’s will extinguish and the numbers ‘123456’ will appear in the centre display. (see Figure 18)

5.1.10. On completion turn off the PMU at the mains switch, silence the Alarm and disconnect the TE4540. 5.2.

Pressure Switch Settings (Pre Serial Number 106000)

Figure 19 Figure 18

The operating pressures of the Pressure Switches are individually set using the knurled plastic knob above the spring on each Pressure Switch.

5.1.4. Press the Alarm Reset button once and the fill compressors will start. 5.1.5. Remove the pipe from the top of each fill compressor (C1 and C2 Figure 19) in turn and connect the TE4540 to the outlet of the compressor. 5.1.6. Adjust the pressure using the TE4540 until the gauge on the TE4540 reads 100mmHg. The flow meter must read at least 6.5 litres / min. If the flow rate is less than 6.5 litres / min the compressor needs to be replaced. Refer to Section 6.4 for details on how to replace the compressor. Repeat for the other fill compressor. 5.1.7. The two fill compressors must have similar flow rates within 2 litres / min. If there is a greater variance it will be necessary to replace either the lowest output compressor or both compressors. Failure to match the flow rates will result in excessive noise and LFT4622 Issue 7

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Set Up / Test Procedure 5.2.1. Carefully pull the large bore silicon tubing from the Vacuum Switch (Figure 18).

5.3.

Pressure Switch Settings (Post Serial Number 106000)

5.2.2. Attach the TE4739 to the Vacuum Switch with the plunger of the syringe half out. 5.2.3. Slowly pull out the plunger of the syringe. The Vacuum Switch must operate no greater than 120mmHg. Release the plunger and allow the vacuum to pull it back in. Check that the Vacuum Switch operates between 15mmHg and 25mmHg. 5.2.4. Remove the TE4739 and reconnect the silicon tube. 5.2.5. Carefully pull the large bore silicon tubing from the Intermediate Pressure Switch Figure 18).

Figure 21 5.3.1. Carefully pull the large bore silicon tubing from the Vacuum Switch.

5.2.6. Attach the TE4879 to the Intermediate Pressure Switch and one of the gauges of the TE4466. Using the bulb on the TE4879 to increase the pressure check that the switch operates between 32mmHg and 37mmHg on the rise.

5.3.2. Attach the TE4739 to the Vacuum Switch with the plunger of the syringe half out. 5.3.3. Slowly pull out the plunger of the syringe. The Vacuum Switch must operate no greater than 120mmHg. Release the plunger and allow the vacuum to pull it back in. The Vacuum Switch shall operate between 15mmHg and 25mmHg.

5.2.7. Remove the TE4879 and reconnect the silicon tube. 5.2.8. Carefully pull the large bore silicon tubing from the Normal Pressure Switch.

5.3.4. Remove the TE4739 and reconnect the silicon tube.

5.2.9. Attach the TE4879 to the Normal Pressure Switch. Check that the switch operates between 40mmHg and 53mmHg on the rise.

5.3.5. Carefully pull the large bore silicon tubing from the Normal Pressure Switch. 5.3.6. Attach the TE4879 to the Normal Pressure Switch and one of the gauges on the TE4466. Using the bulb of the TE4879 to increase the pressure check that the switch operates between 40mmHg and 53mmHg on the rise.

5.2.10. Remove the TE4879 and reconnect the silicon tube. 5.2.11. Carefully pull the large bore silicon tubing from the Over Pressure Switch. 5.2.12. Attach the TE4879 to the Over Pressure Switch. Check that the switch operates between 60mmHg and 65mmHg on the fall.

5.3.7. Remove the TE4879 and reconnect the silicon tube.

5.2.13. Remove the TE4879 and reconnect the silicon tube.

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Set Up / Test Procedure 5.4.

can be adjusted using the nut on the top of the Pressure Relief Valve.

System Test

5.4.1. Connect the Pressure Test Equipment to the PMU and Mattress as shown below

5.4.8. Release both Pressure switches and allow the pressures to return to normal. 5.4.9. Switch the PMU Off at the end of the test and silence the alarm. 5.5.

Service Mode Service Mode is a facility that allows the Service Engineer to check the functions of the components of the Cairwave PMU. It also provides details of elapsed time, time since last service and a history of previous faults.

5.5.1. To enter Service Mode, simultaneously press and hold the Normal and Static Buttons on the front panel while switching on. (see Figure 18) The PMU will ‘beep’ 6 times and the status indication panel will illuminate in turn. Within 10 seconds the LED’s will extinguish and the numbers ‘123456’ will appear in the centre display.

Figure 22 5.4.2. Turn the Unit On and allow the system to fully inflate and be running normally before proceeding with any further tests. When the system is running normally the Normal Green LED on the front panel will be illuminated.

5.5.2. Press the Alarm Reset button once and the fill compressors will start.

5.4.3. When the system is running normally the ‘A’ ‘B’ and ‘C’ cells will alternate between zero and 45mmHg over a 7 ½ minute cycle. The ‘H’ cell will vary between 40mmHg and 55mmHg. Monitor the maximum cell pressures and set to 45mmHg by adjusting the Normal Pressure Switch as required.

5.5.3. Press the Alarm Reset button again and the fill compressors will stop and the vacuum pumps will start. 5.5.4. Press the Alarm Reset button again and the vacuum pumps will stop and the rotorvalve will start.

5.4.4. If the system does not perform in accordance with these criteria, a fault exists. Refer to Section Error! Reference source not found. for fault finding information.

5.5.5. Press the Alarm Reset button again and the rotorvalve will stop. The display will show a random combination of four zeros or ones.

5.4.5. If at any time during these tests the alarm sounds; refer to Section Error! Reference source not found. for fault finding information.

0 0 1 1 5.5.6. These indicate the state of each of the pressure switches. Manually operating each of the pressure / vacuum switches will

For PMU Serial Numbers Pre 106000 5.4.6. To test the Over Pressure Switch – Hold down the paddle of the Normal Pressure Switch; the pressure will increase and the Over Pressure Switch shall operate before 75mmHg turning the fill compressors Off.

change the display between a 0 and 1. The first digit is the Vacuum Switch. The second digit is the Over Pressure Switch. The third digit is the Normal Pressure Switch The fourth digit is the Intermediate Pressure Switch. For PMU Serial Numbers Post 106000

5.4.7. Continue to hold down the Normal Pressure Switch and also hold down the Over Pressure Switch – The pressure will increase and the Pressure Relief valve will operate between 100 – 130mmHg. This

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Set Up / Test Procedure Only the first and third digits will be displayed

The details of the Fault Codes are shown in Section Error! Reference source not found..

5.5.7. At this time the Question Mark symbol will also be illuminated.

5.5.16. To exit Service Mode at any time turn off the PMU and reset the audible alarm.

5.5.8. Insert the Umbilical Connector into the PAC Adapter socket.

5.6.

Head Zoner

5.6.1. Check that the mattress performs in accordance with the positional diagrams on the Head Zoner Selector. (Figures 23 and 24)

5.5.9. Rotate the Umbilical to align the White strip with the Green dot (one click): the Normal Green LED will illuminate and the Question Mark will extinguish. 5.5.10. Rotate the Umbilical to align the White strip with the Red dot (one further click): the Normal Green LED will extinguish and the CPR Red LED will illuminate. 5.5.11. Remove the Umbilical Connector. 5.5.12. Press the Alarm Reset button again and the display will show the Time Since Last Service. The first five digits display the hours since the last service in hours and the last digit shows minutes in multiples of six minutes (decimal) i.e. if the last digit is a five this equates to 0.5 of an hour = 30 minutes. 5.5.13. If a Service has been undertaken the Time Since Last Service can be reset at this time by pressing the reset switch (S1) at the rear right corner of the ECU. If not continue in Service Mode.

Figure 23

5.5.14. Press the Alarm Reset button again and the display will show the Total Elapsed Time of the system. The first five digits display the time in hours and the last digit shows minutes in multiples of six minutes (decimal) i.e. if the last digit is a five this equates to 0.5 of an hour = 30 minutes. This Total Elapsed Time cannot be reset. 5.5.15. Press the Alarm Reset button again and the display will indicate the Fault Codes and the time associated with the fault. Details of the Fault Codes are shown in Section 7. The time shown is Total Elapsed Time and the first digit may be missing due to the length of the display. Take note of the Total Elapsed Time to ensure that you are reading the correct time base. The processor is capable of holding the last 64 faults and the associated time base.

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Component Replacement 6.

Component Replacement

6.3.

All component replacements must be undertaken with the PMU switched OFF and disconnected from the Mains supply.

When the ECU is replaced any service history and fault information will be lost. If necessary read the fault log and record relevant details elsewhere.

To prevent damage, ESD procedures must be observed when working on the PMU. 6.1.

6.3.1. Remove the Battery lead from connector J4 on the ECU. 6.3.2. Disconnect all other connectors from the ECU.

To Open the PMU

6.3.3. Cut the cable tie securing the cable loom to the top of the pillar.

6.1.1. Remove and retain the two allen screws securing the hanging bracket assembly to the rear of the PMU.

6.3.4. Remove and retain the pillar and the screw securing the ECU.

6.1.2. Remove and retain the 6 allen screws securing the rear cover.

6.3.5. Fitting is the reverse of above. Ensure the Battery is connected to J4.

6.1.3. The rear cover can now be removed. This gives access to the ECU and Pressure Switches.

6.4.

6.1.4. To gain access to the other components within the PMU; remove and retain the 3 allen screws securing the Umbilical Bezel in place.

Compressors or Vacuum Pumps

6.4.1. Remove the pipes from the appropriate paired Compressor outlets. 6.4.2. Disconnect the Compressor looms from the ECU.

6.1.5. Remove and retain the two allen screws adjacent to the mains switch.

6.4.3. Remove and retain the 8 screws securing the pair of Compressors to the chassis. Do not disturb the grommets or spacers.

6.1.6. Disconnect the loom connecting the Front Panel ECU to the chassis. The Chassis can now be removed from the front case. 6.2.

Electronic Control Unit (ECU)

ECU Battery

6.2.1. Remove the Battery lead from connector J4 on the ECU. 6.2.2. Cut the cable tie securing the Battery in place. 6.2.3. Dispose of the Battery in accordance with local regulations. 6.2.4. Connect the new battery to the ECU. (It may be necessary to remove the ECU to fix the cable tie in position). Figure 25

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