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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 terminal inlet board
Terminal 56.395.0055.0
X100
10
Terminal 56.398.0055.0
14
Screw on switch inlet zones (option 70)
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)
1.7
Contactor LC1D18B7
1.7
Contactor LC1D25B7
2.5
Tunnel terminal screw, compressor circuit breaker
Circuit breaker 25507
QM
(1)
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
(1)
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
(1) 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.
Clean block fitting with tap water at a pressure of 2/3 bar and
at distance of 30cm. Rub with a soft Nylon, PolyPro
®
or Tynex
®
brush
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.
20.8 -
Refrigerant volume
The unit must be operated in cooling mode to find out, if the unit
charge is correct, by checking the actual subcooling.
Following a small refrigerant leak a loss of refrigerant, compared
to the initial charge will be noticeable in the cooling mode and
affect the subcooling value obtained at the air heat exchanger
(condenser) outlet, but it will not be noticeable in the heating mode.
IMPORTANT: It is therefore not possible to optimise the
refrigerant charge in the heating mode after a leak. The unit
must be operated in the cooling mode to check, if an
additional charge is required.
20 - STANDARD MAINTENANCE