Carrier Aquasnap 30RW Installation, Operation And Maintenance Instructions

Contents

Carrier Aquasnap 30RW Installation, Operation And Maintenance Instructions Manual pdf 36 page image

3614.5 - Refrigerant30RW/30RWA units operate exclusively with R-407C.14.6 - High-pressure switch30RW/30RWA units are equipped with a manually resetsafety pressure switch. Refer to the controls manual forthe alarm acknowledgements.14.7 - High and low-pressure side safety valves30RW units are equipped with safety valves in accordancewith the European directive 97/23/CE. These safety valvesare calibrated and sized in accordance with the originalhigh and low-pressure side equipment. The originally suppliedsafety valves for the 30RWA units are sized to protect theoriginal equipment. To protect equipment that has beenadded on the high-pressure side, refer to the applicableregulations and standards to determine which protectionaccessories may be required.14.8 - Moisture indicatorLocated in the liquid line, permits control of the unit charge,as well as the presence of moisture in the circuit. Bubbles inthe sight glass indicate an insufficiant charge or the presenceof non-condensibles. If moisture is present, the colour ofthe indicator paper in the sight glass changes.14.9 - Filter drier in the refrigerant circuitThe filter keeps the circuit clean and moisture-free. Themoisture indicator shows when it is necessary to changethe filter cartridges. A temperature difference between thefilter drier inlet and outlet indicates a contamination of thecartridges.14.10 - Fixed-speed cold water loop pump(evaporator side)This pump is factory-installed as standard to guarantee thenominal flow in the chilled water loop.This is a fixed-speed pump with available system pressure.See the pump flow/pressure curve.The nominal system flow rate must be adjusted with themanual control valve, located on the leaving water piping(see chapter on the control of the nominal system pressure).The maximum permitted concentration of the glycoladditives is 35%.The maximum pump suction pressure is limited to 4 bar dueto the valve installed on the entering water piping.NOTES: Monitoring during operation, re-qualification,re-testing and re-testing dispensation:• Follow the regulations on monitoring pressurisedequipment.• It is normally required that the user or operator setsup and maintains a monitoring and maintenance file.• If there are no regulations or to complement themfollow the control programmes of EN 378.• If they exist follow local professional recommenda-tions.• Regularly inspect the condition of the coating (paint)to detect blistering resulting from corrosion. To dothis, check a non-insulated section of the containeror the rust formation at the insulation joints.• Regularly check for possible presence of impurities(e.g. silicon grains) in the heat exchange fluids. Theseimpurities maybe the cause of the wear or corrosionby puncture.• Filter the heat exchange fluid check and carry outinternal inspections as described in EN 378-2, annex C.• In case of re-testing take the possible maximumpressure difference of 25 bar into consideration.• The reports of periodical checks by the user or operatormust be included in the supervision and maintenancefile.RepairAny repair or modification of the plate heat exchangers isforbidden.Only the replacement of the complete heat exchanger byan original heat exchanger supplied by the manufacturer ispermitted. The replacement must be carried out by aqualified technician.• The heat exchanger replacement must be shown onthe monitoring and maintenance file.RecyclingThe plate heat exchanger is 100% recyclable. After use itcontains refrigerant vapours and oil residue.operating lifeThis unit is designed for:• prolonged storage of 15 years under nitrogen chargewith a temperature difference of 20 K per day.• 900000 cycles (start-ups) with a maximum difference of6 K between two neighbouring points in the container,based on 12 start-ups per hour over 15 years at a usagerate of 57%.14.4 - Thermostatic expansion deviceThe expansion devices used are thermostatic hermeticmonobloc devices for sizes 30RW/30RWA 020 to 070 andmodular devices for sizes 30RW/30RWA 080 to 300. Theyare factory-set to maintain between 5 and 6 K superheat inall operating conditions any do not require any change insetting, including for operation at part load. All modelshave a charge (MOP) for the thermostatic assembly thatpermits the maximum evaporating pressure to protect thecompressor.