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13 - 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.
13.1 - Level 1 maintenance
See note below.
Simple procedure can be carried out by the user:
- Air heat exchanger (condenser) cleaning - see chapter
"Condenser coil - level 1"
- 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 19PV Touch'Pilot Control instruction manual ).
General visual inspection for any signs of deterioration.
13.2 - Level 2 maintenance
See note below.
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).
- Replace the control box cooling fans (if used) every five years.
- 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.
- Replace compressor capacitors every 10 years (if energized)
or 5 years (if de-energized).
- Replace compressor soft start fan every 5 years.
- 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.
13.3 - 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, will no longer be held
responsible.
13.4 - Tightening of the electrical connections
13.4.1 - Tightening torques for the main electrical
connections
Component
Screw on bus bar and PE, customer connection
M6
M8
M10
M12
Screw on Main supply disconnect switch
Screw on Control supply disconnect switch
Screw on Line reactor
Line reactor for TT300 - M8
Line reactor for TT350 - M10
Screw on EMC Filter
PE
Phases
Screw on Fast acting fuse connection
Screw on TT300 bar connection
Screw on PE panels
M8
Screw on Compressor connection
TT300 - Cap
TT300 - M8
TT350 - M10
TT350 - M8
Control disconnect switch connection
Upstream and downstream screws at terminals
Power supply 24VDC unit
Upstream and downstream screws at terminals
Designation
value
in the unit
(N·m)
L1/L2/L3
9,6
L1/L2/L3
24
L1/L2/L3
49
L1/L2/L3
79,4
QS10*
28
QS10*A
1,7
Z*
24
Z*
49
ZC*
16 (+/- 1)
ZC*
15
FU*
38
L1/L2/L3
25
PE
24
L1/L2/L3
31
PE
21,7
L1/L2/L3
21,7
PE
21,7
QF10* &
2
QM10**
VC*
0,5
29
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