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12 - STANDARD MAINTENANCE
Air conditioning equipment must be maintained by professional
technicians, whilst routine checks can be carried out locally by
specialised technicians.
All refrigerant charging, removal and draining operations must be
carried out by qualified technician and with the correct equipment
for the unit. Any inappropriate handling can lead to uncontrolled
fluid or pressure leaks.
IMPORTANT: Before performing any work on the machine
ensure it is de-energised. If a refrigerant circuit is openened,
it must be evacuated, recharged and tested for leaks. Before
any operation on the refrigerant circuit, it is necessary to
remove the complete refrigerant charge from the unit with a
refrigerant charge transfer unit.
Simple preventive maintenance will allow you to get the best
performance from your HVAC unit:
• Improved cooling performance
• Reduced power consumption
• Prevention of accidental component failure
•
Prevention of major time consuming and costly interventions
• Protection of the environment.
12.1 -
Level information:
-
The level 1 maintenance must be carried out by the operator,
-
The level 2 maintenance must be carried out by a
maintenance service,
-
The level 3 maintenance must be carried out by a
maintenance service with frigorific specific qualifications.
12.1.1 -
Level 1 maintenance
See note in 12.2.
Simple procedure can be carried out by the user:
• Visual inspection for oil traces (sign of a refrigerant leak)
• Check for removed protection devices, and badly closed
doors/covers
• Check the unit alarm report when the unit does not work
(see report in the SmartVu
TM
control manual).
• Check the anti-corrosion coatings.
• Check that the name plates are still present on the unit.
• Verify the entering and leaving temperatures are correct.
General visual inspection for any signs of deterioration.
12.1.2 -
Level 2 maintenance
See note in 12.2.
This level requires specific know-how in the electrical, hydraulic
and mechanical fields. It is possible that these skills are available
locally: existence of a maintenance service, industrial site,
specialised subcontractor.
In these cases, the following maintenance operations are
recommended.
Carry out all level 1 operations, then:
Electrical :
• At least once a year tighten the power circuit electrical
connections (see tightening torques table).
• Check and re-tighten all control/command connections, if
required (see tightening torques table).
•
Check the differential switches for correct operation every
6 months.
• Remove the dust and clean the interior of the control boxes,
if required. Check the filter condition.
• Check the good operation of the air pressurization detection
function of the electrical cabinet (except units with option
330)
• Check the presence and the condition of the electrical
protection devices.
• Replace the fuses every 3 years or every 15000 hours
(age-hardening).
•
Replace the control box fan every five years
• Check that control box ventilation system is not obstructed:
this shall include the fresh air duct as well as the air filters
located on the control box and at the entry of the duct.
Hydraulics :
• Check the water connections.
• Purge the water circuit (see chapter 7 “Water connections”)
•
Clean the water filter (see chapter 7 “Water connections”).
•
Check the water flow via the heat exchanger pressure
difference,
•
Check the condition of the heat-transfer fluid or te water
quality,
• Check for corrosion of the steel pipe work,
• Check the unit operating parameters and compare them
with previous values.
• Keep and maintain a maintenance sheet, attached to each
HVAC unit.
Mechanical :
• Check that the mounting bolts for the ventilation sub-
assemblies, fans, compressors and electrics box are
securely tightened.
All these operations require strict observation of adequate safety
measures: individual protection garments, compliance with all
industry regulations, compliance with applicable local regulations
and using common sense.
12.1.3 -
Level 3 (or higher) maintenance
See note below.
The maintenance at this level requires specific skills/ approval/
tools and know-how and only the manufacturer, his representative
or authorised agent are permitted to carry out these operations.
These maintenance operations concern for example:
•
A major component replacement (compressor, evaporator)
• Any intervention on the refrigerant circuit (handling
refrigerant)
• Changing of parameters set at the factory (application
change)
• Removal or dismantling of the HVAC unit
• Any intervention due to a missed established maintenance
operation
• Any intervention covered by the warranty
NOTE: Any deviation or non-observation of these maintenance
criteria will render the guarantee conditions for the HVAC unit
nul and void, and the manufacturer, Carrier France, will no
longer be held responsible
