Danfoss Maneurop NTZ Series Selection And Application Guidelines

RECIPROCATING COMPRESSORS
N
2
Schrader
20
INSTALLATION AND SERVICE
New compressors have a protective
nitrogen holding charge. Only remove
the suction and discharge plugs just
before connecting the compressor to
the installation, so as to prevent air
and moisture from entering the com-
pressor. Remove the discharge plug
first and the suction plug next; by pro-
ceeding as such, the nitrogen holding
charge can escape via the discharge
connection and the risk of an oil mist
blow-out via the suction connection
will be minimal.
Whenever possible the compressor
must be the last component to be in-
tegrated in the system. It is advisable
to braze the solder sleeves or service
valves to the pipework before the com-
pressor is mounted. when all brazing
is finished and when the total system
is ready, the compressor plugs can be
removed and the compressor can be
mounted to the system with a mini-
mum exposure to ambient air. If this
procedure is not possible, the sleeves
or valves may be brazed to the pipes
when mounted on the compressor. In
this situation nitrogen or CO
2
must be
purged through the compressor via
the schrader valve to prevent air and
moisture ingress. Purging must start
when the plugs are removed and pro-
ceeded during the brazing process.
When rotolock valves are used on the
compressor, they shall be closed im-
mediately after mounting, thus kee-
ping the compressor isolated from
atmosphere or from a not yet dehy-
drated system.
Note:
when the compressor is built into a
«pack» or «rack» configuration which
is not installed immediately on its fi-
nal location, a vacuum pull-down and
moisture removal must be performed
to the "pack" or "rack" as if it were a
complete system (see below). the pack
must be charged with nitrogen or CO
2
and open tubes must be blocked with
caps or plugs.
System pressure test
Always use an inert gas such as nitro-
gen for the pressure test. Never use
other gasses such as oxygen, dry air
or acetylene. These gasses may form
an inflammable mixture with the com-
pressor oil. The maximum allowed test
pressures for NTZ compressors are:
Maximum compressor test pressure at low pressure side
(suction side)
25 bar (g)
Maximum compressor test pressure at high pressure side
(discharge side)
30 bar (g)
Maximum test pressure difference between high and low pressure
side (to avoid that the internal compressor relief valve will open)
30 bar
Compressor connection
to the system

Danfoss Maneurop NTZ Series Specifications

General

Brand	Danfoss
Model	Maneurop NTZ Series
Category	Air Compressor
Language	English