LACO Technologies UN-400VH User manual

UN-400VH
DRY PISTON PUMP
OPERATION AND MAINTENANCE MANUAL

Product Name: UN-400VH Dry Piston Pump
Product Group: UN Series Dry Piston Pumps
Part Numbers: UN-400VH
Manual Rev Number: SMT-09-1013-A1
© 2019 LACO Technologies, Inc. No part of this manual may be reprinted, translated or duplicated without the
expressed written consent of LACO Technologies, Inc.

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TABLE OF CONTENTS
1. Alert Symbols ............................................................................................................................................................... 1
2. Specifications.................................................................................................................................................................. 1
3. Dimensions...................................................................................................................................................................... 1
4. General Information ...................................................................................................................................................... 2
5. Installation....................................................................................................................................................................... 2
6. Operation ........................................................................................................................................................................ 3
7. Maintenance................................................................................................................................................................... 4
8. Inspection........................................................................................................................................................................ 4
9. Troubleshooting .......................................................................................................................................................... 5

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1. Alert Symbols
This is the hazard alert symbol. It is used to alert you that personal injury or
property damage is possible.
DANGER: Severe personal injury or death will occur if hazard is
ignored
WARNING: Severe personal injury or deal can occur if hazard is
ignored
CAUTION: Minor injury or property damage can occur if
hazard is ignored.
2. Specifications
Model
Max. vacuum
Open flow
Watt
Weight
UN-400VH 736 mmHG 13.8 m3/h 230 l/min 120V/1 kw* 31 Kgs
*UN-400VH also available in 220V model
Dimensions

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3. General Information
This unit is designed to be used for the purpose of pumping air. This pump should
not be used for the pumping of fluids, particles, solids, or any combustible
substances likely to cause explosions.
DANGER:
Do not pump flammable or explosive gases or operate the unit in an
atmosphere containing them.
CAUTION:
The unit is designed for pumping air. Do not allow corrosive gases or
particulate material to enter the pump. Water, oil-based contaminants,
or other liquids must be filtered out.
CAUTION:
The normal ambient temperature should not exceed 40 °C (104 °F).
This is particularly important when the unit is installed in a confined
space where heat may build up during operation.
WARNING:
UN-400VH units are oil-less design. Never lubricate these oil-less units.
Most components are made of aluminum and the valves are stainless steel.
4. Installation
WARNING:
To avoid risk of electrocution, do not use this product in an area where it
could come in contact with water or other liquids. If exposed to the
elements, it must be weather protected.

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CAUTION:
Do not block the flow of cooling air over the unit in any way.
CAUTION:
Be sure that the available electric power matches specifications
marked on the unit. Serious damage may occur to the unit if connected
to an improper voltage.
5. Operation
CAUTION:
This pump is designed to start against atmospheric pressure only, not
under load (pressure or vacuum). Care must be taken to eliminate load
when pump is turned off for any reason.
CAUTION:
Installation of a pre-filter on this pump is absolutely required. Failure to
install a pre-filter will damage the unit.
CAUTION:
After use, disconnect plumbing and let the unit run open for about 5
minutes in air before switching it off to purge out droplets of liquid that
may have formed on the inside of the unit. This prevents crystallization
and/or absorption of liquids.

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WARNING:
This unit is thermally protected and will automatically restart
unexpectedly when the overload device resets. Do not pump
flammable or explosive gases or operate this unit in an atmosphere
containing flammable or explosive gases.
6. Maintenance
Intake filter and mufflers require periodic inspection and replacement. Initial
inspection is suggested at 500 hours, then the user should determine the
frequency thereafter. Most problems can be prevented by keeping filters and
mufflers clean. Dirty filters and mufflers decrease unit performance and can
decrease unit life.
7. Inspection
WARNING:
You must disconnect the unit from electrical power before servicing it.
Failure to do so can result in severe personal injury or death.
WARNING:
You must vent all air lines to the unit to remove pressure before
servicing the pump. Failure to do so can result in severe personal injury.
NOTE: LACO Technologies will not guarantee the performance of a field rebuilt
unit. You can return the unit to LACO Technologies or an LACO Technologies
authorized distributor.

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8. Troubleshooting
Problem
Insufficient
Flow
Insufficient
Vacuum
Excessive
Noise
Overload
Won’t
Start
Dirty filter x x x x
Dirty muffler x x x x
Dirty valves x
Back pressure existed x
Worn or damaged cup x x x x
Leaky hose x x
Plugged vacuum or pressure line x x x x
Low voltage x x x
Leaky valve x x