Nash Elmo G 400 Series User manual

© nash_elmo Industries GmbH
Postfach 1510
97605 Bad Neustadt / Saale
Germany
All rights reserved. Order No.: 610.44436.40.000
Edition 09/2003
English
Phone: [phone]
Fax: [phone]
E-mail: [email protected]
Internet: www.nash-elmo.com
Gas-Ring Vacuum
Pumps/Compressors
Operating
Instructions
Series G_400
Models 2BH7 2 2BH7 3 2BH7 4 2BH7 5 2BH7 6
Single-impeller model
(single-stage)
Two-impeller model
(two-stage)
Three-impeller model
(three-stage)

© nash_elmo Industries GmbH 09/2003
All rights reserved.
Transmittal, reproduction, dissemination and/or editing of this document as well as utilization of its contents and
communication thereof to others without express authorization are prohibited. Offenders will be held liable for payment of
damages. All rights created by patent grant or registration of a utility model or design patent are reserved.
Contents
Contents
1Safety ..................................................................................................................................................3
1.1 Definitions .................................................................................................................................3
1.1.1 Safety alert symbol.......................................................................................................3
1.1.2 Signal words.................................................................................................................3
1.2 General safety precautions .......................................................................................................3
1.3 Residual risks............................................................................................................................5
2Intended Use .......................................................................................................................................6
3Technical Data ....................................................................................................................................7
3.1 Mechanical data ........................................................................................................................7
3.2 Electrical data............................................................................................................................9
3.3 Operating conditions .................................................................................................................9
4Transport and Handling.....................................................................................................................10
5Installation .........................................................................................................................................11
5.1 Installation ...............................................................................................................................12
5.2 Electrical connection (motor) ..................................................................................................14
5.3 Connecting pipes/hoses (vacuum pump/compressor)............................................................16
5.3.1 Inlet connection ..........................................................................................................17
5.3.2 Discharge connection.................................................................................................17
5.3.3 Procedure when connecting pipes/hoses ..................................................................17
6Commissioning..................................................................................................................................17
6.1 Preparation..............................................................................................................................18
6.2 Start-up and shut-down...........................................................................................................19
7Operation...........................................................................................................................................19
8Shut-Down and Longer Standstills....................................................................................................20
8.1 Preparing for shut-down or longer standstill ...........................................................................20
8.2 Storage conditions ..................................................................................................................20
9Servicing............................................................................................................................................21
9.1 Repairs/troubleshooting ..........................................................................................................21
9.2 Service/After-sales service......................................................................................................22
9.3 Decontamination and Declaration of Clearance .....................................................................22
10 Disposal.............................................................................................................................................22
11 Explosion-Protected Design ..............................................................................................................22
12 Declaration of Conformity..................................................................................................................23
Fig. 1: Design of gas-ring
vacuum pump/compressor
1 Vacuum pump/compressor
housing
2 Vacuum pump/compressor cover
3 Inlet connection with muffler
4 Discharge connection with
muffler
5 Base
6 Flow direction arrow
7 Rotating direction arrow
8 Drive motor
9 Fan guard (over external fan)
10 Terminal box

nash_elmo Industries GmbH 3 / 23 Order No.: 610.44436.40.000
Subject to change Edition 09/2003
Safety
1 Safety
1.1 Definitions
To point out dangers and important
information, the following signal words and
symbols are used in these operating
instructions:
1.1.1 Safety alert symbol
The safety alert symbol
is located in the
safety precautions in the highlighted heading
field on the left next to the signal word
(DANGER, WARNING, CAUTION).
Safety precautions with a safety alert symbol
indicate a danger of injuries.
Be sure to follow these safety precautions to
protect against injuries or death!
Safety precautions without a safety alert
symbol indicate a danger of damage.
1.1.2 Signal words
DANGER
WARNING
CAUTION
NOTICE
NOTE
The signal words are located in
the safety precautions in the
highlighted heading field.
They follow a certain hierarchy
and indicate (in conjunction with
the safety alert symbol, see
Chapter 1.1.1) the seriousness
of the danger and the type of
warning.
See the following explanations:
DANGER
Danger of injuries.
Indicates an imminently hazardous situation,
that will result in death or serious injury if the
corresponding measures are not taken.
WARNING
Danger of injuries.
Indicates a potentially hazardous situation, that
could result in death or serious injury if the
corresponding measures are not taken.
CAUTION
Danger of injuries.
Indicates a potentially hazardous situation, that
may result in minor or moderate injury if the
corresponding measures are not taken.
CAUTION
Danger of damage.
Indicates a potentially hazardous situation that
may result in property damage if the
corresponding measures are not taken.
NOTICE
Indicates a possible disadvantage, i.e.
undesirable conditions or consequences can
occur if the corresponding measures are not
taken.
NOTE
Indicates a possible advantage if the
corresponding measures are taken; tip.
1.2 General safety precautions
WARNING
Improper use of the unit can result in
serious or even fatal injuries!
These operating instructions
• must have been read completely and
understood before beginning any work with
or at the pump-motor unit,
• must be strictly observed,
• must be available at the operating location
of the pump-motor unit.
WARNING
Improper use of the unit can result in
serious or even fatal injuries!
Only operate the pump-motor unit
• for the purposes indicated under "Intended
Use"!
• with the fluids indicated under 'Intended
Use'!
• with the values indicated under 'Technical
Data'!
WARNING
Improper use of the unit can result in
serious or even fatal injuries!
All work on and with the pump-motor unit
(transport, installation, operation, shut-down,
maintenance, disposal) may only be carried
out by trained, reliable expert personnel!

nash_elmo Industries GmbH 4 / 23 Order No.: 610.44436.40.000
Subject to change Edition 09/2003
Safety
WARNING
When working on the pump-motor unit,
there is a danger of injury, e.g. in the form
of cuts/cutting off, crushing and burns!
During all work on and with the pump-motor
unit (transport, installation, operation, shut-
down, maintenance, disposal) wear personal
safety equipment (safety helmet, protective
gloves, safety shoes)!
WARNING
Hair and clothing can be pulled into the unit
or caught and wound up moving parts!
Do not wear long, loose hair or wide, loose
clothes! Wear a hair net!
DANGER
Electrical danger!
Work on electrical installations may be carried
out by trained and authorized electricians only!
DANGER
Electrical danger!
Before beginning work on the unit or system,
the following measures must be carried out:
• Deenergize.
• Secure against being switched on again.
• Determine whether deenergized.
• Ground and short-circuit.
• Cover or block off adjacent energized parts.
DANGER
Electrical danger!
Do not open the motor terminal box until
absence of electricity has been ensured!
WARNING
Danger due to vacuum and gauge pressure:
sudden escape of fluids (skin and eye
injuries),
sudden drawing in of hair and clothing!
Danger due to escaping fluid:
Burns!
Use mounting elements, connections, lines,
fittings and containers with sufficient freedom
from leaks and strength for the pressures
which occur.
Check the mounting elements, connections,
lines, fittings and containers for strength, leaks
and firm seating at regular intervals!
WARNING
Danger from rotating parts (external fan,
impeller, shaft):
Cutting/cutting off of extremities,
Grasping/winding up of hair and clothing!
Danger due to vacuum and gauge pressure:
sudden escape of fluids (skin and eye
injuries),
sudden drawing in of hair and clothing!
Danger due to escaping fluid:
Burns!
Start-up and operation only under the following
conditions:
• The pump-motor unit must be completely
assembled. When doing so, pay particular
attention to the following components:
– the vacuum pump/compressor cover,
– the muffler on inlet and discharge
connections,
– the fan guard.
• The pipes/hoses must be connected to inlet
and discharge connections.
• Inlet and discharge connections and the
connected pipes/hoses may not be closed,
clogged or soiled.
• Check the mounting elements, connections of
the pipe/hose connections, lines, fittings and
containers for strength, leaks and firm seating
at regular intervals.
WARNING
Danger from rotating parts (external fan,
impeller, shaft):
Cutting/cutting off of extremities,
Grasping/winding up of hair and clothing!
Danger due to vacuum and gauge pressure:
sudden escape of fluids (skin and eye
injuries),
sudden drawing in of hair and clothing!
Danger due to escaping fluid:
Burns!
Before beginning work on the pump-motor unit,
take the following measures:
• Shut down pump-motor unit and secure
against being switched on again.
• Attach a sign on the system controller and on
the control elements for the pump-motor unit:
"DANGER! Maintenance work on vacuum
pump/compressor! Do not switch on!"
• Wait for pump-motor unit to come to a
complete stop. Observe run-on time!
• Allow pump-motor unit to cool!
• Shut-off lines. Release pressure.
• Make sure that no vacuum or gauge pressure
is present in the lines/tanks to be opened.
• Make sure that no fluids can escape.

nash_elmo Industries GmbH 5 / 23 Order No.: 610.44436.40.000
Subject to change Edition 09/2003
Safety
WARNING
Danger from rotating impeller:
Cutting/cutting off of extremities!
The rotating impeller is accessible with the inlet
and discharge connections open!
Do not reach into the unit through open
connections!
Do not insert objects into the unit through the
openings!
WARNING
Danger from rotating impeller:
Cutting/cutting off of extremities!
The rotating impeller is accessible with the inlet
and discharge connections open!
With free entry and exit of gases, i.e. with
direct intake out of or direct feeding into the
atmosphere without piping, the following
therefore applies:
Provide the inlet and discharge connections of
the pump-motor unit either with additional
mufflers or with additional piping of a sufficient
length to prevent access to the impeller!
WARNING
Danger of burns from hot surfaces of the
pump-motor unit and from hot fluids!
High temperatures of up to approx. 160 °C
[320 °F] can occur on the surface of the pump-
motor unit.
Cover the pump-motor unit with a suitable
touch protection (e.g. perforated plate cover or
wire cover).
Do not touch during operation!
Allow to cool after shut-down!
1.3 Residual risks
WARNING
Danger zone:
Hot surface up to approx. 160 °C [320 °F].
Hazard:
Possible burns.
Protective measures:
Cover the pump-motor unit with a suitable
touch protection (e.g. perforated plate cover or
wire cover).
WARNING
Danger zone:
Fan guard
Hazard:
Long, loose hair can be drawn into external fan
through fan guard grate, even with fan guard
mounted!
Protective measures:
Wear hair net!
WARNING
Danger zone:
Missing or defective muffler inlet or discharge
connection.
Hazard:
Possible serious hearing damage due to
emitted noise.
Protective measures:
Have missing or defective mufflers replaced.
Conduct a noise measurement in the system
after installing the pump-motor unit.
The following measures must be taken by the
operator:
• from 85 dB(A):
– Hearing protection must be provided.
• from 90 dB(A):
– Mark noise area with a warning sign.
– Wear hearing protection.
WARNING
Danger zone:
Environment of pump-motor unit.
Hazard:
Possible serious hearing damage due to
emitted noise.
Protective measures:
Conduct a noise measurement in the system
during operation after installing the pump-
motor unit.
The following measures must be taken by the
operator:
• from 85 dB(A):
– Hearing protection must be provided.
• from 90 dB(A):
– Mark noise area with a warning sign.
– Wear hearing protection.
– With free entry and exit of gases, i.e.
with direct intake out of or direct feeding
into the atmosphere without piping,
attach an additional muffler.

nash_elmo Industries GmbH 6 / 23 Order No.: 610.44436.40.000
Subject to change Edition 09/2003
Intended Use
2 Intended Use
These operating instructions
• apply to gas-ring vacuum
pumps/compressors of the G_400 series,
models 2BH7 2, 2BH7 3, 2BH7 4, 2BH7 5
and 2BH7 6,
• contains instructions concerning transport
and handling, installation, commissioning,
operation, shut-down, storage, servicing
and disposal of the G_400,
• must be completely read and understood by
all operating and servicing personnel before
beginning to work with or on the G_400,
• must be strictly observed,
• must be available at the site of operation of
the G_400.
About the operating and servicing personnel of
the G_400:
• These persons must be trained and
authorized for the work to be carried out.
• Work on electrical installations may be
carried out by trained and authorized
electricians only.
The G_400s
• are pump-motor units for generating
vacuum or gauge pressure;
• are used to extract, pump and compress
the following gases:
– Air,
– Non-flammable, non-aggressive, non-
toxic and non-explosive gases or gas-air
mixtures.
– For differing gases/gas-air mixtures,
inquire with the Service Department.
• are equipped with one of the following kind
of drive motors:
– 3-phase AC drive motor with a standard
or explosion-protected design
– Single-phase AC drive motor
These operating instructions apply only to
pump-motor units with a standard design.
For the explosion-protected design , see
the separate operating instructions.
• exist in the following designs:
– single-impeller (single-stage)
– two-impeller (two-stage)
– three-impeller (three-stage)
Increased pressure differences can be
achieved with the two-impeller and three-
impeller pump-motor units.
• are intended for industrial applications,
• are primarily intended for higher pressure
conditions;
• are designed for continuous operation.
With increased switch-on frequency (at
equal intervals of approx. 5x per hour) or
increased gas entry and ambient
temperature, the overtemperature of the
winding and the bearings can be exceeded.
Consultation with the Service Department is
required for operating conditions of this
kind.
When operating the G_400, the limits listed in
Chapter 3, "Technical Data", Pg. 7 ff. must
always be complied with.
Foreseeable Misuse
It is prohibited
• to use the G_400 in applications other than
industrial applications unless the necessary
protection is provided on the system, e.g.
guards suitable for children's fingers;
• to use the device in rooms in which
explosive gases can occur if the G_400 is
not expressly intended for this purpose;
• to extract, to deliver and to compress
explosive, flammable, corrosive or toxic
fluids, unless the G_400 is specifically
designed for this purpose;
• to operate the G_400 with values other than
those specified in Chapter 3, "Technical
Data", Pg. 7 ff.
Any unauthorized modifications of the G_400
are prohibited for safety reasons.
The operator is only permitted to perform the
maintenance and service work described in
these operating instructions.
Any maintenance and service work which goes
beyond this many only be performed by
companies authorized by the manufacturer
(inquire with the Service Department).

nash_elmo Industries GmbH 7 / 23 Order No.: 610.44436.40.000
Subject to change Edition 09/2003
Technical Data
3 Technical Data
3.1 Mechanical data
Weight
Single-impeller design
Model Weight
[kg] [lbs]
2BH7210-0..1.-. approx. 16 approx. 35.3
2BH7310-0..1.-. approx. 16 approx. 35.3
2BH7310-0..2.-. approx. 17 approx. 37.5
2BH7410-0..1.-. approx. 23 approx. 50.7
2BH7510-0..1.-. approx. 26 approx. 57.3
2BH7510-0..2.-. approx. 29 approx. 63.9
2BH7610-0..1.-. approx. 32 approx. 70.5
2BH7610-0..3.-. approx. 35 approx. 77.2
Two-impeller design
Model Weight
[kg] [lbs]
2BH7220-0..2.-. approx. 24 approx. 52.9
2BH7220-0..5.-. approx. 28 approx. 61.7
2BH7320-0..5.-. approx. 30 approx. 66.1
2BH7420-0..2.-. approx. 33 approx. 72.7
2BH7420-0..5.-. approx. 39 approx. 86
2BH7520-0..2.-. approx. 40 approx. 88.2
2BH7520-0..7.-. approx. 51 approx. 112
2BH7620-0..3.-. approx. 48 approx. 106
2BH7620-0..5.-. approx. 65 approx. 143
Three-impeller design
Model Weight
[kg] [lbs]
2BH7630-0..6.-. approx. 94 approx. 207
Minimum distances
Minimum distance to fan guard (for sucking in
cooling air):
Minimum distance to fan guard
Model [mm] [inches]
2BH72 approx. 34 approx. 1.34
2BH73 approx. 34 approx. 1.34
2BH74 approx. 52 approx. 2.05
2BH75 approx. 52 approx. 2.05
2BH76 approx. 53 approx. 2.09
Minimum distance to vacuum
pump/compressor cover:
Minimum distance to face of vacuum
pump/compressor cover
[mm] [inches]
30 1.18
Vibrations
The following table provides information on the
maximum permissible loading due to vibrations.
Vibration value Vibration frequency
ranges
[Hz]
< 6.3 6.3-63 > 63
Vibration path
S [mm] ≤0.16
S [inches] ≤0.006
Vibration velocity
Veff [mm/s] ≤4.5
Veff [ft/s] ≤0.015
Vibration acceleration
a [m/s2] ≤2.55
a [ft/s2] ≤8.37
Noise level
Measuring-surface sound-pressure level as per
DIN 45635, T13, measured at a distance of
1 m [3.28 ft] at an operating point of
approximately 2/3 of the permissible total
pressure difference with the lines connected
without a vacuum or pressure relief valve.
Single-impeller design
Model 1-m measuring-surface
sound pressure level L
[dB (A)]
at 50 Hz: at 60 Hz:
2BH7210-0..1.-. approx. 57 approx. 62
2BH7310-0..1.-. approx. 57 approx. 62
2BH7310-0..2.-. approx. 57 approx. 62
2BH7410-0..1.-. approx. 58 approx. 62
2BH7510-0..1.-. approx. 64 approx. 68
2BH7510-0..2.-. approx. 64 approx. 68
2BH7610-0..1.-. approx. 65 approx. 71
2BH7610-0..3.-. approx. 65 approx. 71
Two-impeller design
Model 1-m measuring-surface
sound pressure level L
[dB (A)]
at 50 Hz: at 60 Hz:
2BH7220-0..2.-. approx. 58 approx. 62
2BH7220-0..5.-. approx. 58 approx. 62
2BH7320-0..5.-. approx. 59 approx. 63

nash_elmo Industries GmbH 8 / 23 Order No.: 610.44436.40.000
Subject to change Edition 09/2003
Technical Data
Two-impeller design
Model 1-m measuring-surface
sound pressure level L
[dB (A)]
at 50 Hz: at 60 Hz:
2BH7420-0..2.-. approx. 61 approx. 66
2BH7420-0..5.-. approx. 61 approx. 66
2BH7520-0..2.-. approx. 64 approx. 70
2BH7520-0..7.-. approx. 65 approx. 71
2BH7620-0..3.-. approx. 67 approx. 71
2BH7620-0..5.-. approx. 68 approx. 72
Three-impeller design
Model 1-m measuring-surface
sound pressure level L
[dB (A)]
at 50 Hz: at 60 Hz:
2BH7630-0..6.-. approx. 77 approx. 80
Temperature increase
The information listed in the following tables
corresponds to the heating of vacuum
pump/compressor housings and the air exiting
compared to the ambient temperature during
operation with a permissible total pressure
difference and an air pressure of 1,013 mbar
[14.7 psi]. At lower air pressures these values
increase.
Single-impeller design
(at a frequency of 50 Hz)
Model Temperature increase
∆T [K] ∆ϑ[F]
2BH7210-0..1.-. approx. 52 approx. 126
2BH7310-0..1.-. approx. 61 approx. 142
2BH7310-0..2.-. approx. 81 approx. 178
2BH7410-0..1.-. approx. 90 approx. 194
2BH7510-0..1.-. approx. 93 approx. 199
2BH7510-0..2.-. approx. 120 approx. 248
2BH7610-0..1.-. approx. 118 approx. 244
2BH7610-0..3.-. approx. 118 approx. 244
Single-impeller design
(at a frequency of 60 Hz)
Model Temperature increase
∆T [K] ∆ϑ[F]
2BH7210-0..1.-. approx. 61 approx. 142
2BH7310-0..1.-. approx. 61 approx. 142
2BH7310-0..2.-. approx. 86 approx. 187
2BH7410-0..1.-. approx. 101 approx. 214
2BH7510-0..1.-. approx. 111 approx. 232
2BH7510-0..2.-. approx. 112 approx. 234
2BH7610-0..1.-. approx. 124 approx. 255
2BH7610-0..3.-. approx. 124 approx. 255
Two-impeller design
(at a frequency of 50 Hz)
Model Temperature increase
∆T [K] ∆ϑ[F]
2BH7220-0..2.-. approx. 55 approx. 131
2BH7220-0..5.-. approx. 74 approx. 165
2BH7320-0..5.-. approx. 81 approx. 178
2BH7420-0..2.-. approx. 89 approx. 192
2BH7420-0..5.-. approx. 121 approx. 250
2BH7520-0..2.-. approx. 89 approx. 192
2BH7520-0..7.-. approx. 125 approx. 257
2BH7620-0..3.-. approx. 124 approx. 255
2BH7620-0..5.-. approx. 124 approx. 255
Two-impeller design
(at a frequency of 60 Hz)
Model Temperature increase
∆T [K] ∆ϑ[F]
2BH7220-0..2.-. approx. 77 approx. 171
2BH7220-0..5.-. approx. 110 approx. 230
2BH7320-0..5.-. approx. 124 approx. 255
2BH7420-0..2.-. approx. 80 approx. 176
2BH7420-0..5.-. approx. 117 approx. 243
2BH7520-0..2.-. approx. 102 approx. 216
2BH7520-0..7.-. approx. 110 approx. 230
2BH7620-0..3.-. approx. 126 approx. 259
2BH7620-0..5.-. approx. 128 approx. 262
Three-impeller design
(at a frequency of 50 Hz)
Model Temperature increase
∆T [K] ∆ϑ[F]
2BH7630-0..6.-. approx. 120 approx. 248
Three-impeller design
(at a frequency of 60 Hz)
Model Temperature increase
∆T [K] ∆ϑ[F]
2BH7630-0..6.-. approx. 120 approx. 248
Tightening torques for screw connections
The following values apply if no other
information is available.
With non-electrical connections, property
classes of 8.8 and 8 or higher as per
DIN ISO 898 (DIN EN 20898 / DIN ISO 898)
are assumed.
Tightening torques for
non-electrical
connections
Thread [Nm] [ft lbs]
M4 3 ± 0.3 2.21 ± 0.22
M5 4 ± 0.4 2.95 ± 0.3

nash_elmo Industries GmbH 9 / 23 Order No.: 610.44436.40.000
Subject to change Edition 09/2003
Technical Data
Tightening torques for
non-electrical
connections
Thread [Nm] [ft lbs]
M6 8 ± 0.8 5.9 ± 0.59
M8 24 ± 2.4 17.7 ± 1.77
M10 42 ± 4.2 31 ± 3.1
M12 70 ± 7.0 51.6 ± 5.16
The following information for electrical
connection applies to all terminal board
connections with the exception of terminal
strips.
Tightening torques for
electrical
connections
Thread [Nm] [ft lbs]
M4 0.8 - 1.2 0.59 - 0.89
M5 1.8 - 2.5 1.33 - 1.84
Especially for metal and plastic threaded cable
glands and pipe unions, the following values
apply:
Tightening torques for
metal threaded
glands/unions
Thread [Nm] [ft lbs]
min max min max
M12x1.5 4 6 2.95 4.43
M16x1.5 5 7.5 3.69 5.53
M20x1.5 6 9 4.43 6.64
M32x1.5
M40x1.5 8 12 5.9 8.85
Tightening torques for
plastic threaded
glands/unions
Thread [Nm] [ft lbs]
min max min max
M12x1.5 2 3,5 1.48 2.58
M16x1.5 3 4 2.21 2.95
M20x1.5 4 5 2.95 3.69
M32x1.5
M40x1.5 5 7 3.69 5.16
3.2 Electrical data
See rating plate.
3.3 Operating conditions
Temperatures
max. permissible temperature:
+40 °C [+104 °F]
Nominal value:
+15 °C [+59 °F]
Tem
p
erature of
Pump-motor units for higher
fluid temperatures on request.
max. permissible temperature:
+40 °C [+104 °F]
min. permissible temperature:
-30 °C [-22 °F]
Nominal value:
+25 °C [+77 °F]
Ambient
temperature
(standard
design)1:
Ambient temperatures between
25 °C [+77 °F] and 40 °C
[+104 °F] affect the permissible
total pressure difference (see
Section "Permissible total
pressure difference").
At higher temperatures the
winding may be damaged and
the grease change interval may
be shortened.
Pressures
Min. inlet
pressure: See rating plate.
Max. discharge
pressure during
compressor
operation: See rating plate.
Max.
permissible
pressure in
pump-motor
unit:
2.5 bar abs. [36.2 psia]
At this pressure the operation of
the pump-motor unit may be
considerably impaired.
Provide a corresponding
protective device (e.g. pressure
relief valve) if necessary.
1For design with frequency converter, see
separate operating instructions.

nash_elmo Industries GmbH 10 / 23 Order No.: 610.44436.40.000
Subject to change Edition 09/2003
Transport and Handling
Permissible
total pressure
difference:
The total pressure difference
specified on the rating plate
only applies under the following
conditions:
• Ambient temperature:
25 °C [77 °F].
• Inlet temperature
(temperature of pumped
gases at inlet connection):
15 °C [59 °F].
• Pressure:
during vacuum-pump
operation:
1,013 mbar [14.7 psia] at
discharge connection;
during compressor
operation:
1,013 mbar [14.7 psia] at
inlet connection;
At an ambient temperature of
40 °C [104 °F] the total
pressure difference specified on
the rating plate must be
reduced by 10%.
If the ambient temperature is
between 25 °C [77 °F] and
40 °C [104 °F], then the total
pressure difference specified on
the rating plate must be
reduced linearly to the
temperature by between 0 and
10 %.
Installation altitude
Max. of 1,000 m [3,280 ft] above sea level.
When installing the pump-motor unit at an
altitude of more than 1,000 m [3,280 ft] above
sea level, first inquire with the Service
department.
4 Transport and Handling
WARNING
Tipping or falling can lead to crushing,
broken bones etc.!
Sharp edges can cause cuts!
Wear personal safety equipment (gloves,
safety shoes and protective helmet) during
transport!
WARNING
Danger from tipping or falling loads!
Prior to transport and handling make sure that
all components are securely assembled and
secure or remove all components the fasteners
of which have been loosened!
Manual handling:
WARNING
Danger from lifting heavy loads!
Manual handling of the unit is only permitted
within the following limits:
• max. 30 kg [max. 66 lbs] for men
• max. 10 kg [max. 22 lbs] for women
• max. 5 kg [max. 11 lbs] for pregnant women
For the weight of the pump-motor unit, see
Chapter 3.1, "Mechanical data",
Section "Weight", Pg. 7.
For weights above the given values use
suitable lifting appliances and handling
equipment!
Handling by means of lifting equipment:
WARNING
Danger from tipping or falling loads!
When transporting with lifting equipment,
observe the following basic rules:
• The lifting capacity of lifting equipment and
lifting gear must be at least equal to the
unit's weight.
For the weight of the pump-motor unit, see
Chapter 3.1, "Mechanical data",
Section "Weight", Pg. 7.
• The pump-motor unit must be secured so
that it cannot tip or fall.
• Do not stand or walk under suspended
loads!
The transport must be carried out in different
ways depending on the model:
• Models 2BH72., 2BH73., 2BH74. [single-
impeller] and 2BH75. [single-impeller]:
Manual handling
• Models 2BH74. [two-impeller], 2BH75. [two-
impeller] and 2BH76.:
Transport with crane, hooked onto eye bolt
(1 attachment point)

nash_elmo Industries GmbH 11 / 23 Order No.: 610.44436.40.000
Subject to change Edition 09/2003
Installation
For transport with a crane, the pump-motor
unit can be hooked onto the crane hook as
follows:
• directly on the eye bolt
or possibly
• with lifting belts.
Eye bolt:
All models are equipped with an eye bolt. The
eye bolt is mounted on the vacuum
pump/compressor housing.
In case of possible removal and remounting of
the eye bolt, it must be ensured that the eye
level is positioned exactly in the axis direction
of the pump-motor unit. Lay shims under the
eye bolt if necessary.
The eye bolt must be firmly tightened.
Loads laterally to the ring level are not
permissible. Heavy impact loads during
transport must be avoided.
5 Installation
WARNING
Improper use of the unit can result in
serious or even fatal injuries!
Have you read the safety precautions in
Chapter 1, "Safety", Pg. 3 f.?
Otherwise you many not carry out any work
with or on the pump-motor unit!
DANGER
Danger from missing view into area of
pump-motor unit!
When operating the control elements without a
view into the area of the pump-motor unit,
there is a danger that the pump-motor unit will
be switched on while other persons are still
performing work on it. Extreme injuries are
possible!
Provide control elements at a location with a
view of the pump-motor unit.
DANGER
Electrical danger!
The pump-motor unit must be installed so that
the electrical device cannot be damaged by
external influences!
In particular, the feed pipes must be securely
routed, e.g. in cable ducts, in the floor etc.
WARNING
Danger from balance damage caused by
vibration!
Vibrating environments can cause balance
damage!
Install the pump-motor unit on a solid
foundation or on a solid mounting surface.
Check screw glands/unions for mounting the
pump-motor unit on the mounting surface
regularly for strength and firm seating.
WARNING
Danger from crushing due to pump-motor
unit tipping over!
Wear personal safety equipment (protective
gloves and safety shoes).
Handle the unit with the appropriate care.
Install the pump-motor unit on a solid
foundation or on a solid mounting surface!
Check screw glands/unions for mounting the
pump-motor unit on the mounting surface
regularly for strength.
WARNING
Danger of fire from flammable substances!
The pump-motor unit must never come into
contact with flammable substances.
For exact information on the temperature
increase, see Chapter 3.1, "Mechanical data",
Section "Temperature increase", Pg. 8.
WARNING
Danger of burns from hot surfaces of the
pump-motor unit and from hot fluids!
High temperatures of up to approx. 160 °C
[320 °F] can occur on the surface of the pump-
motor unit.
The pump-motor unit must be installed so that
accidental touch of its surface is not possible.
Cover the pump-motor unit with a suitable
touch protection (e.g. perforated plate cover or
wire cover).
WARNING
Danger of injuries from flying parts!
Select installation so that parts that are thrown
out through the grate if the external fan breaks
cannot hit persons!

nash_elmo Industries GmbH 12 / 23 Order No.: 610.44436.40.000
Subject to change Edition 09/2003
Installation
CAUTION
Danger of tripping and falling!
Make sure the unit does not present a danger
of tripping.
Lay cables and pipes so that they cannot be
reached during operation(recessed in floor, in
ducts on the wall etc.).
CAUTION
Danger of overheating due to hot surface of
pump-motor unit!
High temperatures can occur on the surface of
the pump-motor unit.
Temperature sensitive parts, such as lines or
electronic components, may not come into
contact with the surface of the pump-motor
unit.
The pump-motor unit is ready to connect on
delivery.
However, if the time from delivery to
commissioning of the pump-motor unit
exceeds a certain period, the lubrication of the
rolling bearings must be renewed.
See Chapter 8.2, "Storage conditions",
Section "Lubrication of rolling bearings after
longer storage", Pg. 20 for information on this
topic.
Carry out the following work to install the
pump-motor unit:
• Installation and securing,
• Attachment of the included loose muffler if
necessary,
• Attachment of threaded flange or hose
flange (available as accessories)
for the connection of inlet or discharge pipe
to the muffler,
• Electrical connection,
• Connection of inlet and discharge
connection to the system.
5.1 Installation
WARNING
For an installation that differs from the
following specifications, it is necessary to
inquire with the Service Department!
Ambient conditions:
The pump-motor unit is suitable for installation
in the following environments:
• In a dusty or damp environment,
• in buildings,
• in the open.
When properly installed in the open, the
pump-motor unit must be protected from
exposure to intensive sunlight, e.g. by
attaching a protective roof. Otherwise, no
special protective devices against the
effects of weathering are required.
NOTICE
The maximum permissible loading due to
vibrations may not be exceeded!
See Chapter 3.1, "Mechanical data",
Section "Vibrations", Pg. 7 for information on
this topic.
The drive motors of the pump-motor units have
the following design:
• with degree of protection IP55 (see rating
plate),
• with tropicalized insulation.
Installation conditions:
The pump-motor unit must be installed as
follows:
• on level surfaces,
• at a maximum height of 1000 m [3,280 ft]
above sea level.
When installing at an altitude of more than
1,000 m [3,280 ft] above sea level, first
inquire with the Service Department.
Minimum distance:
To ensure sufficient cooling of the pump-motor
unit, it is absolutely necessary that the required
minimum distances to the fan guard and to the
face of the vacuum pump/compressor
cover be maintained.
see Chapter 3.1, "Mechanical data",
Section "Minimum distances", Pg. 7.
The compliance of the specified minimum
distance to the face of the vacuum
pump/compressor cover is especially important
when installing on the vacuum
pump/compressor cover or near a wall.

nash_elmo Industries GmbH 13 / 23 Order No.: 610.44436.40.000
Subject to change Edition 09/2003
Installation
CAUTION
To ensure sufficient cooling of the pump-motor
unit, also observe the following:
• Ventilation screens and openings must
remain clear.
• Discharge air of other units may not be
directly sucked in again!
Noise radiation:
To reduce the noise radiation, the following
must be observed:
• Do not mount pump-motor unit on noise-
conducting or noise-radiating parts
(e.g. thin walls or sheet-metal plates).
• Provide pump-motor unit with sound-insulating
intermediate layers (e.g. rubber buffers under
the base of the pump-motor unit) if necessary.
• Install the pump-motor unit on a stable
foundation or on a rigid mounting surface.
This provides for smooth, low-vibration
running of the pump-motor unit.
Components for reducing noise on the pump-
motor unit:
• Mufflers (included as standard equipment):
On delivery the pump-motor units are
equipped with attached mufflers as
standard. The noise radiation is
considerably reduced by the mufflers. See
Fig. 2 to Fig. 4, Pg. 16 ff.
• Additional mufflers (available as an
option):
The additional mufflers enable a further
noise reduction. They may only be used
with free entry and exit of gases, i.e. with
direct intake out of or direct feeding into the
atmosphere without piping.
• Noise protection hoods (available as an
option):
Noise protection hoods are suitable for
installation in rooms and in the open. They
reduce both the total sound pressure level
and tonal components that are perceived as
particularly annoying.
Installation variants/axis position:
Basically, when installing the pump-motor unit,
the following variants are possible with a
different axis position (horizontal or vertical):
• Horizontal installation
• Vertical installation on the vacuum
pump/compressor cover ("cover installation")
• Vertical mounting on the wall.
Basically, all variants are possible with all
models.
However, a distinction must be made between
a design with and a design without a
condensed water opening for the axis
position:
• The pump-motor units without a condensed
water opening can be installed and secured
in any axis position.
• The pump-motor unit with a condensed
water opening may only be installed and
secured horizontally with the base at the
bottom.
Horizontal installation
Screw the base of the pump-motor unit to the
surface with suitable mounting elements.
Proceed as follows:
• Provide the base of the pump-motor unit
with mounting holes.
• Select the suitable screw type.
• Screw the base of the pump-motor unit to
the surface with the screws.
When doing so, be sure to provide all
mounting holes with screws!
Vertical installation on the vacuum
pump/compressor cover ("cover
installation")
With vertical installation of the pump-motor unit
with the vacuum pump/compressor cover
facing downward, rubber feet must be used.
Proceed as follows:
• The rubber feet are available as
accessories.
They are delivered in a set of 3.
On the upper section they are provided with
stud bolts and on the lower section with a
threaded hole.
• Mount the rubber feet on the pump-motor
unit:
Screw the stud bolts of the rubber feed into
the holes on the face of the vacuum
pump/compressor cover and tighten them.
• Mount the pump-motor unit together with
the rubber feet on the installation surface:
Select suitable mounting elements for the
threaded hole.
Screw the rubber feet to the surface or
foundation via the threaded hole.

nash_elmo Industries GmbH 14 / 23 Order No.: 610.44436.40.000
Subject to change Edition 09/2003
Installation
Vertical mounting on the wall
With vertical mounting of the pump-motor unit
on the wall, the pump-motor unit is mounted
via the holes in the base.
Proceed as follows:
• Position the pump-motor unit as close to
the wall as possible on a stable supporting
plate with sufficient load-bearing capacity.
The pump-motor unit must be positioned
with the base toward the wall.
• Provide the base of the pump-motor unit
with mounting holes.
• Select the suitable screw type.
• Screw the base of the pump-motor unit to
the wall with the screws.
When doing so, be sure to provide all
mounting holes with screws!
• Remove the supporting plate.
Eye bolt:
Following installation, the eye bolt must be
either firmly tightened or removed.
5.2 Electrical connection (motor)
DANGER
Electrical danger!
Improper behavior can result in severe injuries
and material damage!
DANGER
Electrical danger!
The electrical connection may be carried out
by trained and authorized electricians only!
DANGER
Electrical danger!
Before beginning work on the unit or system,
the following measures must be carried out:
• Deenergize.
• Secure against being switched on again.
• Determine whether deenergized.
• Ground and short-circuit.
• Cover or block off adjacent energized parts.
CAUTION
Incorrect connection of the motor can lead to
serious damage to the unit!
Regulations:
The electrical connection must be carried out
as follows:
• according to the applicable national and
local laws and regulations,
• according to the applicable system-
dependent prescriptions and requirements,
• according to the applicable regulations of
the utility company.
Electrical power supply:
Observe the rating plate.
It is imperative that the operating conditions
correspond to the data given on the rating plate!
Deviations permissible without reduction in
performance:
• ±5 % voltage deviation
• ±2 % frequency deviation
Connection to drive-motor terminal box:
Open the required cable entry openings on the
terminal box. Here the following two cases are
differentiated:
• The cable entry opening is prefabricated
and provided with a sealing plug.
• Screw out sealing plug.
OR
• The cable entry opening is closed off with a
casting skin (only on pump-motor units with
drive-motor axis heights of 100 to 160 in
standard design).
• Break out casting skin using a suitable tool.
For example, use a metal pin with a
corresponding diameter or a chisel and
hammer.
CAUTION
When pounding out the casting skin on the
cable entry openings in the terminal box, the
terminal box or its parts can be damaged (e.g.
terminal board, cable connections).
Proceed with suitable caution and precision
when doing so!
Prevent flash formation!

nash_elmo Industries GmbH 15 / 23 Order No.: 610.44436.40.000
Subject to change Edition 09/2003
Installation
Mount cable glands on the terminal box.
Proceed as follows:
• Select one cable gland in each case which
is suitable for the cable diameter.
• Insert this cable gland in the opening of the
terminal box.
Use a reducer if necessary.
• Screw on the cable gland so that no
moisture, dirt etc. can penetrate into the
terminal box.
Carry out the connection and the arrangement
of the jumpers in accordance with the circuit
diagram in the terminal box.
Connect the protective conductor to the
terminal with the following symbol:
.
The electrical connection must be carried out
as follows:
• The electrical connection must be
permanently safe.
• There may be no protruding wire ends.
• Clearance between bare live parts and
between bare live parts and ground:
≥5.5 mm [0.217"] (at a nominal voltage of
UN≤690V).
• For the tightening torques for terminal
board connections (except terminal strips),
see Chapter 3.1, "Mechanical data",
Section "Tightening torques for screw
connections", Pg. 8.
• For terminals with clamping straps (e.g. as
per DIN 46282), the conductors must be
inserted so that approximately the same
clamping height results on both sides of the
bar.
Individual conductors must therefore be
bent into a U-shape or connected with a
cable lug (DIN 46234).
This also applies to:
• the protective conductor,
• the outer ground conductor.
Both conductors can be recognized from their
color (green/yellow).
DANGER
Electrical danger!
The terminal box must be free from
• foreign bodies,
• dirt,
• humidity.
Terminal box cover and cable entries must be
tightly closed so as to make them dustproof
and waterproof. Check for tightness at regular
intervals.
DANGER
Electrical danger!
Clearance between bare live parts and
between bare live parts and ground:
at least 5.5 mm [0.217"] (at a nominal voltage
of UN≤690V).
There may be no protruding wire ends!
For motor overload protection:
• Use motor circuit breakers.
• This must be adjusted to the specified
nominal current (see rating plate).
DANGER
Electrical danger!
There is danger of an electrical shock when a
defective pump-motor unit is touched!
Mount motor circuit breaker.
Have electrical equipment checked regularly
by an electrician.
Interference immunity of drive motor:
For drive motors with integrated sensors, the
operator must provide for a sufficient
interference immunity itself. Select a suitable
sensor signal cable (e.g. with screening,
connection as for a motor power-supply cable)
and analyzing unit.
Operation with frequency converter:
With a power supply by external frequency
converters, the following must be observed:
• High-frequency current and voltage
harmonics in the motor supply cables can
lead to emitted electromagnetic
interference. This is dependent on the
converter design (model, manufacturer,
interference suppression measures).
• Be sure to observe the EMC notes of the
converter manufacturer!

nash_elmo Industries GmbH 16 / 23 Order No.: 610.44436.40.000
Subject to change Edition 09/2003
Installation
• Use screened power supply cables if
necessary. For optimal screening, the
screen must be conductively connected over
a large area to the metal terminal box of the
drive motor with a screwed metal gland.
• In the case of drive motors with integrated
sensors (e.g. PTC thermistors) interference
voltage can occur on the sensor cable
depending on the converter model.
• Limit speed:
see specifications on the rating plate.
WARNING
Pump-motor units with a UL approbation may
not be operated on frequency converters in the
US without testing by a suitable test agency!
5.3 Connecting pipes/hoses (vacuum
pump/compressor)
Mufflers:
The pump-motor units are delivered with
mufflers (indicated with arrows in the following
illustrations) for the inlet and discharge
connections as standard equipment.
With single-impeller pump-motor units, the
mufflers are already mounted on delivery.
Fig. 2: 2BH721 ... 2BH761 (single-impeller
pump-motor units)
With two-impeller and three-impeller pump-
motor units, the inlet-side muffler is included
loose for packaging-related reasons and must
be mounted by the operator.
Fig. 3: 2BH722 ... 2BH762 (two-impeller pump-
motor units with two-stage design)
Fig. 4: 2BH723 ... 2BH763 (three-impeller pump-
motor units with three-stage design)
WARNING
Danger from rotating impeller:
Cutting/cutting off of extremities!
The rotating impeller is accessible with the inlet
and discharge connections open!
With free entry and exit of gases, i.e. with
direct intake out of or direct feeding into the
atmosphere without piping, the following
therefore applies:
Provide the inlet and discharge connections of
the pump-motor unit either with additional
mufflers or with additional piping of a sufficient
length to prevent access to the impeller!
Connections:
To prevent foreign bodies from entering the
unit, all connections are sealed off when
delivered. Do not remove the sealing plugs
until immediately before connecting the
pipes/hoses.
The following applies for the arrangement of
the pipe/hose connections:
The pumped gases are sucked in via the inlet
connection (see Chapter 5.3.1, Pg. 17) and
discharged via the discharge connection (see
Chapter 5.3.2, Pg. 17).
The rotating direction of the shaft is marked
with an arrow on the face of the vacuum
pump/compressor cover and on the fan guard
(Fig. 1, Pg. 2, Item 7).
The flow direction of the gases is marked
with arrows on both connections (Fig. 1, Pg. 2,
Item 6).

nash_elmo Industries GmbH 17 / 23 Order No.: 610.44436.40.000
Subject to change Edition 09/2003
Commissioning
WARNING
Danger from interchanging inlet and
pressure line!
Interchanged inlet and pressure lines can lead
to damage to the pump-motor unit and the
system, and as a result of this to serious
injuries!
Make sure that the inlet and pressure line
cannot be confused when connecting.
Look for the clear marking with the flow
direction arrow on the inlet and discharge
connections.
WARNING
Danger due to vacuum and gauge pressure!
Danger due to escaping fluid!
During operation, connected pipes and vessels
are vacuumized or pressurized!
Use only mounting elements, connections,
lines, fittings and containers with sufficient
freedom from leaks and strength for the
pressures which occur.
Make sure that the mounting elements and
connections are mounted sufficiently firmly and
leak-free!
CAUTION
If the pumped gases are passed on on the
discharge side in a closed pipe system, then it
must be ensured that the pipe system is
adapted to the maximum discharge pressure.
See Chapter 3.3: "Operating conditions",
Section "Pressures", Pg. 9). Connect a
pressure relief valve upstream if necessary.
NOTICE
Attach pipes/hoses free of mechanical
tensions.
Support the weight of the pipes/hoses.
5.3.1 Inlet connection
The inlet connection with the related muffler
(Fig. 1, Pg. 2, Item 3) is marked with an arrow
pointing into the vacuum pump/compressor.
Connect the inlet pipe here. The pumped
gases are sucked in via this.
Procedure: see Chapter 5.3.3.
WARNING
Danger from solid bodies and impurities in
the pump-motor unit!
If solid bodies penetrate into the pump-motor
unit, blades of the impellers can break and
broken pieces can be thrown out.
Install a filter in the inlet pipe.
Replace filter regularly!
5.3.2 Discharge connection
The discharge connection with the related
muffler (Fig. 1, Pg. 2, Item 4) is marked with an
arrow pointing out of the vacuum
pump/compressor. Connect the discharge pipe
here. The pumped gases are discharged via
this.
Procedure: see Chapter 5.3.3.
5.3.3 Procedure when connecting
pipes/hoses
Attach the pipes/hoses to the unit as described
in the following.
The pipes/hoses are connected differently to
inlet and discharge connections depending on
the type of line (pipe or hose):
• Muffler (with inside threads):
The pipe is screwed directly into the
muffler.
• Hose connection:
– Screw hose flange (available as an
accessory) onto the muffler.
– Push the hose onto the hose flange and
secure it with a hose clamp. See
Chapter 3.1, "Mechanical data",
Section "Tightening torques for screw
connections", Pg. 8 for information on
this topic.
6 Commissioning
WARNING
Improper use of the unit can result in
serious or even fatal injuries!
Have you read the safety precautions in
Chapter 1, "Safety", Pg. 3 f.?
Otherwise you many not carry out any work
with or on the pump-motor unit!

nash_elmo Industries GmbH 18 / 23 Order No.: 610.44436.40.000
Subject to change Edition 09/2003
Commissioning
WARNING
Danger from rotating parts (external fan,
impeller, shaft):
Cutting/cutting off of extremities,
Grasping/winding up of hair and clothing!
Danger due to vacuum and gauge pressure:
sudden escape of fluids (skin and eye
injuries),
sudden drawing in of hair and clothing!
Danger due to escaping fluid:
Burns!
Start-up and operation only under the following
conditions:
• The pump-motor unit must be completely
assembled. When doing so, pay particular
attention to the following components:
– the vacuum pump/compressor cover,
– the muffler on inlet and discharge
connections,
– the fan guard.
• The pipes/hoses must be connected to inlet
and discharge connections.
• Inlet and discharge connections and the
connected pipes/hoses may not be closed,
clogged or soiled.
• Check the mounting elements, connections
of the pipe/hose connections, lines, fittings
and containers for strength, leaks and firm
seating at regular intervals.
6.1 Preparation
WARNING
Danger from closed connections!
With closed/soiled intake or discharge
connections vacuum or gauge pressure results
in the pump-motor unit.
This can overheat and damage the drive motor
winding.
Before start-up, make sure that the inlet and
discharge connections are not closed, clogged
or soiled!
CAUTION
Before starting up again after a longer
standstill:
Measure the insulation resistance of the motor.
With values ≤1 kΩper volt of nominal voltage,
the winding must be dried.
Measures before start-up:
• If a shut-off device is installed in the
discharge pipe:
Make sure that the unit is NOT operated
with the shut-off device closed.
• Before starting up the pump-motor unit,
observe the values specified on the rating
plate. Specifications on the drive-motor
nominal current apply at a gas entry and
ambient temperature of +40° C [104 °F].
• Adjust the motor circuit breaker to the drive-
motor nominal current.
Check direction of rotation:
• The intended rotating direction of the shaft
is marked with an arrow on the face of the
vacuum pump/compressor cover and on
the fan guard (Fig. 1, Pg. 2, Item 7).
• The flow direction is marked with arrows on
the inlet and discharge connections (Fig. 1,
Pg. 2, Item 6).
• Make sure the pipes/hoses on the inlet and
discharge connections are properly
connected.
• Switch the pump-motor unit on briefly and
then off again.
• Compare the actual rotating direction of the
external fan with the intended shaft rotating
direction indicated with the arrows shortly
before the pump-motor unit comes to a
standstill.
• If necessary, reverse the direction of
rotation of the motor.
WARNING
Danger due to rotating parts!
Danger due to vacuum and gauge pressure!
Danger due to escaping fluid!
Test runs may also only be conducted with the
pump-motor unit completely mounted.
DANGER
Electrical danger!
The electrical connection may be carried out
by trained and authorized electricians only!

nash_elmo Industries GmbH 19 / 23 Order No.: 610.44436.40.000
Subject to change Edition 09/2003
Operation
DANGER
Electrical danger!
Before beginning work on the unit or system,
the following measures must be carried out:
• Deenergize.
• Secure against being switched on again.
• Determine whether deenergized.
• Ground and short-circuit.
• Cover or block off adjacent energized parts.
Check operating speeds:
Observe the operating speed specified on the
rating plate. This may not be exceeded, as
otherwise the noise radiation, vibration
behavior, grease consumption duration and
bearing change interval worsen. To prevent
damage as a result of higher speeds, it may be
necessary to inquire with the Service
Department as to the maximum speed.
WARNING
Danger of hearing damage due to noise
radiation!
For the noise emission of the pump-motor unit
measured by the manufacturer, see Chapter 3.1,
"Mechanical data", Section "Noise level", Pg. 7.
However, the actual noise emission during
operation is highly dependent on the
installation and system conditions.
Conduct a noise measurement in the system
during operation after installing the pump-
motor unit.
The following measures must be taken by the
operator:
• from 85 dB(A):
– Hearing protection must be provided.
• from 90 dB(A):
– Mark noise area with a warning sign.
– Wear hearing protection.
– With free entry and exit of gases, i.e.
with direct intake out of or direct feeding
into the atmosphere without piping,
attach an additional muffler.
6.2 Start-up and shut-down
Start-up
• Open shut-off device in intake/discharge pipe.
• Switch on power supply for drive motor.
Shut-down:
• Switch off power supply for drive motor.
• Close shut-off device in intake/discharge pipe.
7 Operation
WARNING
Improper use of the unit can result in
serious or even fatal injuries!
Have you read the safety precautions in
Chapter 1, "Safety", Pg. 3 f.?
Otherwise you many not carry out any work
with or on the pump-motor unit!
Also be sure to read the safety precautions in
Chapter 6, "Commissioning", Pg. 17!
Starting up and shutting down
See Chapter 6, "Commissioning", Sub-
Chapter 6.2, "Start-up and shut-down", Pg. 19.
Also be sure to observe the following important
notes especially for operation:
WARNING
Danger of burns from hot surfaces of the
pump-motor unit and from hot fluids!
High temperatures of up to approx. 160 °C
[320 °F] can occur on the surface of the pump-
motor unit.
Do not touch during operation!
Allow to cool after shut-down!
CAUTION
Danger of overheating due to hot surface of
pump-motor unit!
High temperatures of up to approx. 160 °C
[320 °F] can occur on the surface of the pump-
motor unit.
Temperature sensitive parts, such as lines or
electronic components, may not come into
contact with the surface of the pump-motor
unit.
CAUTION
Danger of overheating!
During operation the standstill heating may, if
installed, not be switched on!
CAUTION
Danger of rusting due to collection of
condensed water in drive motor area!
On drive motors with closed condensed water
openings:
Remove closures occasionally to allow any
water which has collected to drain off.

nash_elmo Industries GmbH 20 / 23 Order No.: 610.44436.40.000
Subject to change Edition 09/2003
Shut-Down and Longer Standstills
CAUTION
Danger of bearing damage!
Heavy mechanical impacts must be avoided
during operating and while at a standstill.
8 Shut-Down and Longer
Standstills
8.1 Preparing for shut-down or longer
standstill
WARNING
Improper use of the unit can result in
serious or even fatal injuries!
Have you read the safety precautions in
Chapter 1, "Safety", Pg. 3 f.?
Otherwise you many not carry out any work
with or on the pump-motor unit!
CAUTION
Danger of rusting due to collection of
condensed water in drive motor area!
On drive motors with closed condensed water
openings:
Remove closures occasionally to allow any
water which has collected to drain off.
CAUTION
Danger of bearing damage!
Heavy mechanical impacts must be avoided
during operating and while at a standstill.
Prior to shut-down or longer standstill, proceed
as follows:
• Switch off the pump-motor unit.
• Close shut-off device in inlet and pressure
line if installed.
• Disconnect pump-motor unit from power
supply.
• Release pressure.
When doing so, open pipes/hoses slowly
and carefully so that the vacuum or gauge
pressure in the pump-motor unit can be
released.
• Remove pipes/hoses.
• Provide mufflers on inlet and discharge side
with sealing plugs.
8.2 Storage conditions
To prevent standstill damage during storage, the
environment must provide the following conditions:
• dry,
• dust-free,
• low-vibration (effective value of vibration
speed veff ≤2.8 mm/s [0.11"/sec]).
• Ambient temperature: max. 40 °C [+104 °F].
CAUTION
Danger of overheating due to high
temperature!
When storing in an environment with a
temperature of over 40 °C [104 °F], the
winding may be damaged and the grease
change interval may be shortened.
Lubrication of rolling bearings after longer
storage:
The new pump-motor unit may at first be
stored following delivery.
If the time from deliver to commissioning
exceeds the following periods, the lubrication
of the rolling bearings must be renewed:
• Under advantageous storage conditions
(as specified above): 4 years.
• Under disadvantageous storage conditions
(e.g. high humidity, salty air, sandy or dusty
air): 2 years.
In these cases open rolling bearings must be
relubricated and closed rolling bearings must
be completely replaced. In this case be sure to
inquire with the Service Department. In
particular, exact information with regard to the
procedure and grease type are required.
WARNING
Improper use of the unit can result in
serious or even fatal injuries!
All maintenance work on the pump-motor unit
must always be performed by the Service
Department!
Maintenance work on the pump-motor unit may
only be conducted by the operator itself when
the related maintenance manual on hand!
Inquire with the Service Department!
Commissioning after longer standstill:
Before recommissioning after a longer
standstill, measure the insulation resistance of
the drive motor. With values ≤1 kΩper volt of
nominal voltage, the winding must be dried.