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13 -STANDARD MAINTENANCE
The compressor oil that is covered during maintenance contains
refrigerant and must be treated accordling.
Refrigerant under pressure must not be purged to the open air.
13.4 - Tightening torques for the main electrical
connections
13.4.1 - Tightening torques for the main electrical
connections
Component
Screw on bus bar, customer connection
M8
M10
Soldered screw PE, customer connection (M12)
Tunnel terminal screw, compressor contactor
Contactor 3RT103_
Contactor 3RT104_
Contactor 3RT105_
Contactor 3RT106_
Nut on compressor contactor deck
M8 for contactor 3RT105_
M10 for contactor 3RT10_7
Tunnel terminal screw, current transformer
Size 2 (3RB2956_)
Size 3 (3RB2966_)
Nut on current transformer deck
M8
M10
Compressor earth terminal in the power wiring
control box
Terminal M8
Compressor phase connection terminals
M12
M16
Compressor earth connection
Tunnel terminal screw, disconnects 3RV1011_
Tunnel terminal screw, hydronic pump contactor
Contactor 3RT101_
Contactor 3RT102_
ATTENTION: The tightening of the connections at the
compressor terminals requires special precautions. Please
refer to the chapter below.
13.4.2 - Connection precautions for the compressor
power terminals
These precautions must be applied during an intervention that
requires the removal of the power conductors connected to the
compressor supply terminals.
The tightening nut of terminal (6) supporting the isolator (7) must
never be loosened, as ist ensures terminal tightness and
compressor leak tightness.
The tightening of phase lug (4) must apply the torque between counter
nut (5) and tightening nut (3): During this operation a counter-torque
must be applied at counter nut (5). Counter-nut (5) must not be in
contact with the tightening nut of terminal (6).
58
Designation
Value
in the unit
(N.m)
-
18
L1 /L2 /L3
30
PE
70
1.
Torque application to tighten the lug
2.
Avoid contact between the two nuts
3.
Lug tightening nut
5
4.
Flat lug
11
5.
Counter-nut
6.
Terminal tightening nut
KM_
21
7.
Isolator
18
13.5 - Tightening torques for the main bolts and
KM_
30
screws
11
Screw type
TI_
21
(N·m)
18
Metal screw D = 4.8
TI_
30
Metal screw D = 6.3
Screw H M8
Gnd
30
25
Taptite screw M10
EC_
30
Gnd sur
25
EC_
Taptite screw M6
Screw H M8
QF_ /QM_
1
Screw H M6
Nut H M10
KM90_
1
2,2
Nut H M10
Screw H M8
Screw H M12
Screw H M16
Screw H M16
Screw H M20
Nut 5/8 ORFS
Nut 3/8 ORFS
Nut H M12/M16
Self-locking Nut M16
ATTENTION: The tightening of the connections at the
compressor terminals requires special precautions. Please
refer to the chapter below.
13.6 - Condenser coil
We recommend that coils are inspected regularly to check the
degree of cleanliness. This depends on the environment where
the unit is installed, especially urban and industrial sites, and for
units installed near trees that shed their leaves. Recommendations
for maintenance and cleaning of micro-channel coils (MCHE):
- Regularly cleaning the coil surface is essential for correct
- unit operation.
- Eliminating contamination and removal of harmful residue
- The maintenance and cleaning procedures below are part of
Condensing module, housing
Plastic volute & grill
Condensing module,
compressor fixing
Condensing module, chassis
- structure fixing, control box
fixings, compressor fixings, oil
separator fixing
Piping support, cowling
Compressor chassis
Hydraulic pump chassis
Filter drier cover
Economiser port flange
Oil separator flanges, suction
Heat exchanger water boxes
Suction flanges
Victaulic collars on suction
Compressor fixing
will increase the operating life of the coils and the unit.
the regular maintenance to increase the operating life of coils.
Use
Value (N.m)
4,2
supports
4,2
18
30
7
Piping clip
12
Piping clip
10
30
30
35
40
110
flanges
190
190
Oil line
65
Oil line
26
60/130
piping
30
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