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20 - STANDARD MAINTENANCE
20.4 - Tightening torques for the main electrical
connections
Component/screw type
Soldered screw (PE) customer connection
M8
Screw on terminal inlet board
Terminal 56.395.0055.0
Terminal 56.398.0055.0
Screw on switch inlet zones (option 70)
Switch - MG 28908
Switch - MG 28910
Switch - MG 28912
Switch - MG 31102
Tunnel terminal screw, compressor contactor
Contactor LC1D12B7
Contactor LC1D18B7
Contactor LC1D25B7
Tunnel terminal screw, compressor circuit breaker
Circuit breaker 25507
Circuit breaker 25508
Circuit breaker 25509
Tunnel terminal screw, control power transformer
Transformer - 40958E
Transformer - 40959E
Transformer - 40888E
Transformer - 40894E
Compressor earth terminal in the power wiring control box
M6
Compressor earth connection
M8
Tunnel terminal screw, disconnect switch (fan, pump)
Disconnect switch GV2ME08
Disconnect switch GV2ME10
Disconnect switch GV2ME14
Tunnel terminal screw, contactor (fan, pump)
Contactor LC1K0610B7
Contactor LC1K09004B7
Contactor LC1K0910B7
Contactor LC1K0901B7
20.5 - Tightening torques for the main bolts and
screws
Screw type
Compressor strut
Compressor support
M8 nut
BPHE
M10 nut
Compressor mounting
M16 nut
Compressor fixing
Oil nut
Oil equalisation line
Fan support, storage
Taptite screw M6
Taptite screw M8
Fan motor fixing
Taptite screw M10
Four-way valve fixing
H M8 screw
Fan scroll fixing
Metal screw
Sheet metal plates
H M6 screw
Stauff clamps
Earth screw
Compressor
(1) BPHE = Brazed plate heat exchanger
54
Designation
in the unit
PE
X100
QS_
KM
(1)
QM
(1)
TC
Gnd
Gnd
QM_
KM
0.8 to 1.3
Used for
Torque (N·m)
30
fixing
15
(1)
30
30
75
7
tank fixing
13
30
18
4.2
10
2.8
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
Value
unit is installed, and will be worse in urban and industrial
(N·m)
installations and near trees that shed their leaves.
For coil cleaning, two maintenance levels are used, based on the
14.5
AFNOR X60-010 standard:
• If the air heat exchangers are fouled, clean them gently in
10
a vertical direction, using a brush.
14
• Only work on air heat exchangers with the fans switched
off.
• For this type of operation switch off the HVAC unit if service
8
considerations allow this.
8
• Clean air heat exchangers guarantee optimal operation of
8
your HVAC unit. This cleaning is necessary when the air
15
heat exchangers begin to become fouled. The frequency
of cleaning depends on the season and location of the HVAC
1.7
unit (ventilated, wooded, dusty area, etc.).
1.7
WARNING: Never use pressurised water without a large
2.5
diffuser. Do not use high-pressure cleaners for Cu/Cu and
Cu/Al coils.
3.6
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.
0.6
Clean block fitting with tap water at a pressure of 2/3 bar and
at distance of 30cm. Rub with a soft Nylon, PolyPro
brush
Protect the control box during cleaning operations.
5.5
20.7 - Water heat exchanger maintenance
2.83
Check that:
• the insulating foam is intact and securely in place.
• the cooler heaters are operating, secure and correctly
1.7
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.
or Tynex
®
®
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