Haier 1U71S2SG1FA Service Manual

Also see for 1U71S2SG1FA: Installation manual Service manual Installation manual

Contents

31Repair to Intrinsically Safe Components- Do not apply any permanent inductive or capacitance loads to the circuit without ensuring that this will not exceedthe permissible voltage and current permitted for the equipment in use.- Intrinsically safe components are the only types that can be worked on while live in the presence of a flammableatmosphere.- Replace components only with parts specified by the manufacturer. Other parts may result in the ignition ofrefrigerant in the atmosphere from a leak.Cabling- Check that cabling will not be subject to wear, corrosion, excessive pressure, vibration, sharp edges or any otheradverse environmental effects. The check shall also take into account the effects of aging or continual vibrationfrom sources such as compressors or fans.Detection of Flammable Refrigerants Removal and Evacuation- The refrigerant charge shall be recovered into the correct recovery cylinders and the system shall be “flushed”with OFN to render the unit safe. This process may need to be repeated several times.- Compressed air or oxygen shall not be used for purging refrigerant systems.- Flushing shall be achieved by breaking the vacuum in the system with OFN and continuing to fill until the workingpressure is achieved, then venting to atmosphere, and finally pulling down to a vacuum. This process shall berepeated until no refrigerant is within the system. When the final OFN charge is used, the system shall be venteddown to atmospheric pressure to enable work to take place.- The vacuum pump is not close to any ignition sources and that ventilation is available.Charging Procedures- Ensure that contamination of different refrigerants does not occur when using charging equipment. Hoses or linesshall be as short as possible to minimise the amount of refrigerant contained in them.- Cylinders shall be kept upright.- Ensure that the refrigeration system is earthed prior to charging the system with refrigerant.- Label the system when charging is complete (if not already).- Extreme care shall be taken not to overfill the refrigeration system.- Prior to recharging the system, it shall be pressure-tested with the appropriate purging gas. The system shall beleak- tested on completion of charging but prior to commissioning. A follow up leak test shall be carried out priorto leaving the site.Decommissioning- Before carrying out this procedure, it is essential that the technician is completely familiar with the equipment andall its detail.- Prior to the task being carried out, an oil and refrigerant sample shall be taken in case analysis is required prior tore-use of reclaimed refrigerant.- Electrical power must be available before the task is commenced.