Tripp-Lite SRXCOOL12KEU Manual Del Propietário página 13

Service and Service Precautions
• Marking to the equipment continues to be visible and legible. Markings and signs that are illegible should be corrected.
• Refrigeration pipe or components are installed in a position where they are unlikely to be exposed to any substance which may corrode
refrigerant containing components, unless the components are constructed of materials which are inherently resistant to being corroded or
are suitably protected against being so corroded.
2. Check Electrical Devices
Repair and maintenance to electrical components should include initial safety checks and component inspection procedures. If a fault exists
that could compromise safety, no electrical supply should be connected to the circuit until it is satisfactorily dealt with. If the fault cannot be
corrected immediately but it is necessary to continue operation, an adequate temporary solution should be used. This should be reported to
the owner of the equipment, so all parties are advised.
Initial safety checks should include:
• That capacitors are discharged. This should be done in a safe manner to avoid possibility of sparking.
• That there are no live electrical components and no wiring is exposed while charging, recovering or purging the system.
• That there is continuity of earth bonding.
3. Repairs to Sealed Components
• During repairs to sealed components, all electrical supplies should be disconnected from the equipment being serviced prior to any removal
of sealed covers, etc. If it is absolutely necessary to have an electrical supply to equipment during servicing, then a permanently operating
form of leak detection should be located at the most critical point to warn of a potentially hazardous situation.
• Particular attention should be paid to the following to ensure that by working on electrical components, the casing is not altered in such a
way that the level of protection is affected. This should include damage to cables, excessive number of connections, terminals not made to
original specification, damage to seals, incorrect fitting of glands, etc.
• Ensure the apparatus is mounted securely.
• Ensure seals or sealing materials have not degraded such that they no longer serve the purpose of preventing the ingress of flammable
atmospheres. Replacement parts should be in accordance with the manufacturer's specifications.
Note: The use of silicon sealant may inhibit the effectiveness of some types of leak detection equipment. Intrinsically safe components do not
have to be isolated prior to working on them.
4. Repair to Intrinsically Safe Components
• Do not apply any permanent inductive or capacitance loads to the circuit without ensuring that this will not exceed the 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 flammable atmosphere. The test
apparatus should be at the correct rating. Replace components only with parts specified by the manufacturer. Other parts may result in the
ignition of refrigerant in the atmosphere from a leak.
5. Cabling
• Check that cabling will not be subject to wear, corrosion, excessive pressure, vibration, sharp edges or any other adverse environmental effects.
The check should also take into account the effects of aging or continual vibration from sources such as compressors or fans.
6. Detection of Flammable Refrigerants
• Under no circumstances should potentially sources of ignition be used in the searching for or detection of refrigerant leaks. A halide torch (or
any other detector using a naked flame) should not be used.
7. Leak Detection Methods
The following leak detection methods are deemed acceptable for systems containing flammable refrigerants.
• Electronic leak detectors should be used to detect flammable refrigerants, but the sensitivity may not be adequate or may need re-calibration
(detection equipment should be calibrated in a refrigerant-free area). Ensure the detector is not a potential source of ignition and is suitable
for the refrigerant used. Leak detection equipment should be set at a percentage of the LFL of the refrigerant and calibrated to the refrigerant
employed and the appropriate percentage of gas (25 % maximum) is confirmed.
• Leak detection fluids are suitable for use with most refrigerants, but the use of detergents containing chlorine should be avoided as the chlorine
may react with the refrigerant and corrode the copper pipe-work.
• If a leak is suspected, all naked flames should be removed/extinguished.
• If leakage of refrigerant is found which requires brazing, all refrigerant should be recovered from the system or isolated (by means of shutoff
valves) in a part of the system remote from the leak. Oxygen-free nitrogen (OFN) should then be purged through the system both before and
during the brazing process.
8. Removal and Evacuation
When accessing the refrigerant circuit to make repairs (or for any other purpose), conventional procedures should be used. However, it is
important to follow best practice, since flammability is a consideration. The following procedure should be adhered to:
• Remove refrigerant.
• Purge the circuit with inert gas.
• Evacuate.
• Purge again with inert gas.
• Open the circuit by cutting or brazing.
13