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11 - STANDARD MAINTENANCE
Air conditioning equipment must be maintained by professional
technicians, whilst routine checks can be carried out locally by
specialised technicians. See the standard EN 378-4.
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
There are five maintenance levels for HVAC units, as defined by
the AFNOR X60-010 standard.
11.1 -
Level 1 maintenance
See note below.
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).
General visual inspection for any signs of deterioration.
11.2 -
Level 2 maintenance
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:
-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 presence and the condition of the electrical
protection devices.
-Replace the fuses every 3 years or every 15000 hours (age-
hardening).
-Check the water connections.
-Purge the water circuit (see chapter 7 “Water connections”)
-
Clean the water filter (see chapter 7 “Water connections”).
-Check the unit operating parameters and compare them with
previous values.
-Keep and maintain a maintenance sheet, attached to each
HVAC unit.
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.
11.3 -
Level 3 (or higher) maintenance
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
11.4 -
Tightening of the electrical connections
11.4.1 -
Tightening torques for the main electrical
connections
Screw type
Designation
in the unit
Torque
value, N·m
Customer connection
Screw-nut M12 at phase decks
L1/L2/L3
50
Nut on earth terminal
PE
81
Downstream power connections in the control box
Screw M10 at downstream main
disconnect deck (QS10)*
L1/L2/L3
50
Earth terminal M10
50
Power connections in the variator
GS-
M10 nut on the phase pin
19-40
M10 nut on the earth pin
19-40
Compressor phase connection terminals
M12
1/2/3/4/5/6
on EC-
23
M16
1/2/3/4/5/6
on EC-
30
Compressor earth connection
Gnd on EC-
25
Control disconnect connections
Upstream and downstream screws at
terminals
QF
2
ATTENTION: The tightening of the connections at the
compressor terminals requires special precautions. Please
refer to the chapter below.