28
11.4.2 -
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).
Legend
1. Torque application to tighten the lug
2. Avoid contact between the two nuts
3. Lug tightening nut
4. Flat lug
5. Counter-nut
6. Terminal tightening nut
7. Isolator
11.5 -
Tightening torques for the main bolts and
screws
Screw type
Used for
Torque value,
N·m
M20 nut
Chassis
190
M20 nut
Heat exchanger side-side
connection
240
M16 nut
Compressor fixing
190
H M16 screw
Heat exchanger water boxes,
structure
190
H M16 screw
Compressor suction flanges
190
H M20 screw
Compressor suction flanges TU
& TV
240
M16 nut
Compressor discharge line TU
190
M20 nut
Compressor discharge line TV
240
H M8 screw
Drier cover
35
1/8 NPT connection
Oil line
12
TE nut
Compressor oil line
24,5
7/8 ORFS nut
Oil line
130
5/8 ORFS nut
Oil line
65
3/8 ORFS nut
Oil line
26
H M6 screw
Stauff collar
10
Taptite screw M6
Oil line collar
7
Metric screw M6
Plate fixing, control box, terminal
box
7
Taptite screw M10
Oil filter, control box fixing
30
ATTENTION: The tightening of the connections at the
compressor terminals requires special precautions. Please
refer to the chapter above.
11.6 -
Evaporator and condenser maintenance
Check that:
-the insulating foam is intact and securely in place,
-
the sensors and flow switch are correctly operating and
correctly positioned in their support,
-the water-side connections are clean and show no sign of
leakage.
11.7 -
Compressor maintenance
11.7.1 -
Oil filter change schedule
As system cleanliness is critical to reliable system operation, there
is a filter in the oil line at the oil separator outlet. The oil filter is
specified to provide a high level of filtration (5 µm) required for
long compressor life.
The filter should be checked after the first 500 hours of operation,
and every subsequent 2000 hours. The filter should be replaced
at any time when the pressure differential across the filter exceeds
2 bar.
The pressure drop across the filter can be determined by
measuring the pressure at the discharge port (at the oil separator)
and the oil pressure port (at the compressor). The difference in
these two pressures will be the pressure drop across the filter,
check valve, and solenoid valve. The pressure drop across the
check valve and solenoid valve is approximately 0.4 bar, which
should be subtracted from the two oil pressure measurements to
give the oil filter pressure drop.
11 - STANDARD MAINTENANCE