45
20.4 - Tightening torques for the main electrical
connections
Component/screw type
Designation in
the unit
value (N·m)
Soldered screw (pE) customer connection
M8
PE
14.5
Screw on switch inlet zones
Switch - MG 28908
QS_
8
Switch - MG 28910
8
Switch - MG 28912
8
Switch - MG 31102
15
Tunnel terminal screw, compressor contactor
Contactor LC1D12B7
KM*
1.7
Contactor LC1D18B7
1.7
Contactor LC1D25B7
2.5
Tunnel terminal screw, compressor circuit breaker
Circuit breaker 25507
QM*
3.6
Circuit breaker 25508
Circuit breaker 25509
Tunnel terminal screw, control power transformer
Transformer - 40958E
TC
0.6
Transformer - 40959E
Transformer - 40888E
Transformer - 40894E
Compressor earth terminal in the power wiring control box
M6
Gnd
5.5
Compressor earth connection
M8
Gnd
2.83
Tunnel terminal screw, disconnect switch (fan, pump)
Disconnect switch GV2ME08
QM_
1.7
Disconnect switch GV2ME10
Disconnect switch GV2ME14
Tunnel terminal screw, contactor (fan, pump)
Contactor LC1K0610B7
KM
0.8 to 1.3
Contactor LC1K09004B7
Contactor LC1K0910B7
Contactor LC1K0901B7
20.5 - Tightening torques for the main bolts and screws
Screw type
Used for
Torque (N·m)
Compressor strut
Compressor support
30
M8 nut
BPHE* fixing
15
M10 nut
Compressor mounting
30
M16 nut
Compressor fixing
30
Oil nut
Oil equalisation line
75
Taptite screw M6
Fan support, storage tank fixing
7
Taptite screw M8
Fan motor fixing
13
Taptite screw M10
Four-way valve fixing
30
H M8 screw
Fan scroll fixing
18
Metal screw
Sheet metal plates
4.2
H M6 screw
Stauff clamps
10
Earth screw
Compressor
2.8
* BPHE = Brazed plate heat exchanger
20.6 - air heat exchanger
We recommend, that finned coils are inspected regularly to
check the degree of fouling. This depends on the environment
where the unit is installed, and will be worse in urban and
industrial installations and near trees that shed their leaves.
For coil cleaning, two maintenance levels are used, based
on the AFNOR X60-010 standard:
•
If the air heat exchangers are fouled, clean them gently
in a vertical direction, using a brush.
•
Only work on air heat exchangers with the fans switched
off.
•
For this type of operation switch off the HVAC unit if
service considerations allow this.
•
Clean air heat exchangers guarantee optimal operation
of your HVAC unit. This cleaning is necessary when the
air heat exchangers begin to become fouled. The
frequency of cleaning depends on the season and
location of the HVAC unit (ventilated, wooded, dusty
area, etc.).
WArNINg: Never use pressurised water without a large
diffuser. Do not use high-pressure cleaners for Cu/Cu and
Cu/Al coils.
Concentrated and/or rotating water jets are strictly
forbidden. Never use a fluid with a temperature above
45°C to clean the air heat exchangers.
Correct and frequent cleaning (approximately every three
months) will prevent 2/3 of the corrosion problems.
Protect the control box during cleaning operations.
20.7 - Water heat exchanger maintenance
Check that:
•
the insulating foam is intact and securely in place.
•
the cooler heaters are operating, secure and correctly
positioned.
•
the water-side connections are clean and show no sign
of leakage.
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