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Installation, operation and maintenance instructions - VMGFE102
16.3 - Level 3 (or higher) maintenance
The maintenance at this level requires specifi c skills/approval/
tools and know-how and only the manufacturer, his repre-
sentative or authorised agent are permitted to carry out these
operations. These maintenance operations refer for example
to:
•
a major component replacement (compressor, water
heat exchanger),
•
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.
•
one to two leak checks per year with a certifi ed leak
detector and carried out by a qualifi ed person.
To reduce waste, the refrigerant and the oil must be trans-
ferred in accordance with applicable regulations, using
methods that limit refrigerant leaks and pressure drops and
with materials that are suitable for the products.
Any detected leaks must be repaired immediately.
The compressor oil that is recovered during maintenance
contains refrigerant and must be treated accordingly.
Refrigerant under pressure must not be purged to the open
air.
If a refrigerant circuit is opened, plug all openings, if the
operation takes up to one day, or for longer periods charge the
circuit with nitrogen.
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, Danfoss
will no longer be held responsible.
16.4 - 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
16.5 - Tightening torques for the main bolts and screws
Screw type
Used for
Torque (N.m)
Compressor strut
Compressor support
30
M8 nut
BPHE* fi xing
15
M10 nut
Compressor mounting
30
M16 nut
Compressor fi xing
30
Oil nut
Oil equalisation line
75
Taptite screw M6
Fan support, receiver fi xing
7
Taptite screw M8
Fan motor fi xing
13
Taptite screw M10
Four-way valve fi xing
30
H M8 screw
Fan scroll fi xing
18
Metal screw
Sheet metal plates
4.2
H M6 screw
Stauff clamps
10
Earth screw
Compressor
2.8
* BPHE = Brazed plate heat exchanger
16.6 - Air heat exchanger
We recommend, that fi nned 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:
Level 1
•
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.).
