23
INSTALLATION AND SERVICE
System cleanliness
System contamination is one of the
main factors that a ects equipment
reliability and compressor service life.
Therefore it is important to take care
of the system cleanliness when as-
sembling a refrigeration system. Dur-
ing the manufacturing process, circuit
contamination can be caused by:
z
Brazing and welding oxides,
z
Filings and particles from removing
burrs from pipe-work,
z
Brazing ux,
z
Moisture and air.
Only use clean and dehydrated,
refrigeration-grade copper tubes and
silver alloy brazing material. Clean all
parts before brazing and always purge
nitrogen or CO
2
through the pipes
during brazing to prevent oxidation.
If ux is used, take every precaution
to prevent the leakage of ux into
the piping. The use of ux core or
ux coated braze wire or rod instead
of brush applied paste ux is strongly
recommended. Do not drill holes
(e.g. for schrader valves) in parts
of the installation that are already
completed, when lings and burrs
cannot be removed. Carefully follow
the instructions below regarding
brazing, mounting, leak detection,
pressure test and moisture removal.
All installation and service work shall
only be done by quali ed personnel
respecting all procedures and using
tools (charging systems, tubes, vacuum
pumps, etc.) dedicated for R404A and
R507A.
Compressor handling,
mounting and connection
Component
Torque (Nm)
Min. Max.
Rotolock suction valve, NTZ048 - NTZ068 80 100
Rotolock suction valve, NTZ096 - NTZ271 100 120
Rotolock discharge valve, NTZ048 – NTZ068 70 90
Rotolock discharge valve, NTZ096 - NTZ271 80 100
Electrical T-block screws HN°10-32 UNF x 9.5 - 3
Earth screw - 3
Oil sight glass (with black chloroprene gasket) 40 45
3/8” are oil equalisation nut 45 50
Schrader nut 11.3 17
Schrader valve (internal) 0.4 0.8
Mounting grommet bolt, NTZ048 – NTZ136 12 18
Mounting grommet bolt, NTZ215 - NTZ271 40 60
Belt crankcase heater - 4
Compressor handling Maneurop® NTZ compressors must be
handled with care and all handling pro-
cedures must be performed smoothly
and gently. Each NTZ has been tted
with one lift ring which shall always be
used to lift the compressor. Once the
compressor is installed, the lift ring
shall never be used to lift the complete
installation.
Always use the proper tools for trans-
porting the compressor. Keep the
compressor in an upright position dur-
ing all handling tasks (manipulating,
transport, storage). The angle o the
vertical must not exceed 15 degrees.
Compressor mounting The compressor must be mounted
onto a horizontal surface with a maxi-
mum slope of 3 degrees. Always use
the rubber mounting grommets that
are shipped with the compressor.
Mounting torques are listed in the be-
low table.
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