www.Welltec.pro 29
Service notes
g. Ventilation - before opening the system or starting work at very high temperatures, ensure adequate ventilation of the work
space and access to fresh air. Ventilation should be in operation. Ventilation should ensure that the refrigerant released is
dispersed and, if possible, discharged into the atmosphere.
h. Checking refrigeration equipment - electrical components must be replaced with components suitable for the specific device
specification and in accordance with its specifications. Observe all manufacturer's maintenance and repair instructions. If in doubt,
consult the manufacturer's technical department.
i. Installations using flammable refrigerants require a number of inspection activities, which are listed below.
• The amount of refrigerant is compatible with the surface of the room where the coolant-containing components are installed.
• Ventilation devices and vents are working and not obstructed. If an intermediate cooling circuit is used, check for the presence
of coolant in the slave circuit.
• The marking placed on the device is visible and legible. Illegible signs and symbols should be brought to a usable condition.
• The refrigerant piping and components are positioned to minimize the risk of exposure to substances that could corrode
components that contain the coolant, unless the components are made of materials that are intrinsically corrosion resistant
or have been properly protected against it.
j. Checking electrical components - Repair and maintenance of electrical components should include a preliminary safety check
and component checking procedures. If a fault is detected that may reduce safety, do not connect power until the fault has been
properly remedied. If the fault cannot be rectified quickly and at the same time it is required to continue working, a suitable
temporary solution should be applied. The owner must be notified of the fault to ensure the safety of all users.
k. The initial security check should include the following.
• Capacitors should be discharged; this must be done safely to avoid sparking.
• Filling, recovering or draining the system must not take place in an environment where there are exposed cables or live
components.
• Ensure uninterrupted connection to the grounding circuit.
7. Repair of sealed components
a. Before removing sealed covers, etc. during repair, turn off all power sources for the equipment that will be serviced. If the
equipment must be powered during service, a permanently functioning refrigerant leak detector should be placed in a critical
place to alert you to potentially hazardous situations.
b. Particular attention should be paid to the following aspects to ensure that when working with electrical components, the guards
are not damaged which could reduce the level of protection.
c. This includes cable damage, excessive connections, non-compliant connectors, gasket damage, incorrectly positioned glands,
etc. Make sure that the device is positioned securely.
d. Check if the seals or sealing materials have not been damaged to the extent that would limit their function, i.e. preventing the
entry of flammable substances into the housing. Spare parts must comply with the manufacturer's specifications.
e. NOTE! The use of silicone sealants may limit the effectiveness of some leak detection devices. Intrinsically safe components do
not have to be insulated before starting work.
8. Repair of 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 shall 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.
9. Wires
Check that cabling will not be subject to wear, corrosion, excessive pressure, vibration, sharp edges or any other adverse
environmental effects. The check shall also take into account the effects of aging or continual vibration from sources such as
compressors or fans.
To Next Page
Loading...