RECIPROCATING COMPRESSORS
19
INSTALLATION AND SERVICE
System cleanliness
System contamination is one of the
main factors that affects equipment
reliability and compressor service life.
Therefore it is important to take care
of the system cleanliness when assem-
bling a refrigeration system. During
the manufacturing process, circuit
contamination can be caused by:
●
Brazing and welding oxides,
●
Filings and particles from removing
burrs from pipe-work,
●
Brazing flux,
●
Moisture and air.
Only use clean and dehydrated, re-
frigeration-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 flux is used, take every precaution
to prevent leakage into the piping. Be
carefull not to drill holes in pipe-work
(e.g. for schrader valves) in parts of the
installation that are already comple-
ted when filings and burrs cannot be
removed. Carefully follow the instruc-
tions below regarding brazing, moun-
ting, leak detection, pressure test
and moisture removal. All installation
and service work shall only be done
by qualified personnel respecting all
procedures and using tools (charging
systems, tubes, vacuum pumps, etc.)
dedicated for R404A and R507A.
Compressor handling,
mounting
and connection
Maneurop® NTZ compressors must be
handled with care and all handling pro-
cedures must be performed smoothly
and gently. Each NTZ has been fitted
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 du-
ring all handling tasks (manipulating,
transport, storage). The angle off the
vertical must not exceed 15 degrees.
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” flare 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
Compressor mounting
The compressor must be moun-
ted onto a horizontal surface with
a maximum slope of 3 degrees.
Always use the rubber mounting
grommets that are shipped with the
compressor. Mounting torques are lis-
ted in the below table.
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