Huntleigh Flowtron DVT User manual

F048 Issue 3
Mar 2003
Huntleig
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HEALTHCARE
Flowtron®DVT
Service Manual

F048 Issue 3
Mar 2003

PRELIMINARIES
Revision Record
All revisions incorporated in this copy of the manual must be recorded below.
Section Page
No. Issue CN Inserted By Section Page No. Issue CN Inserted By
Issue 3 (i) F048
Mar 2003

Preface
Review this manual before attempting to service or repair the equipment.
Warnings, Cautions and Notes
WARNINGS given in this manual identify possible hazards in procedures or
conditions which, if not followed correctly, could result in loss of life or severe
personal injury.
CAUTIONS given in this manual identify procedures or conditions which, if
not followed correctly, could result in equipment damage.
NOTES given in this manual are used to explain or amplify a procedure or
condition.
General Warnings
Issue 3 (ii) F048
Mar 2003
This manual is intended to be used only by Huntleigh Healthcare trained
service technicians. In the event that the manual is provided to a
customer in response to customer requirements, the customer is
advised not to attempt repairs and to direct any required service to
Huntleigh trained service technicians. In no event will Huntleigh be
responsible for any service performed by customers or third parties.
WARNING
Before performing any service or maintenance procedures, ensure
that the equipment has been adequately decontaminated.
Voltages in excess of 30 Vrms or 50 Vdc can be lethal, in certain
circumstances. When working on equipment requiring exposure to
live unprotected conductors, where such voltages are present,
extreme care must be exercised.

Contents
INTRODUCTION .................................1-1
How To Use This Manual ..........................1-1
Technical Description ............................1-2
Servicing Protocol ..............................1-3
OPERATIONAL MAINTENANCE .........................2-1
Routine Checks ...............................2-1
TROUBLESHOOTING ..............................1-1
Preliminary Checks .............................1-1
Further Checks ...............................1-1
PREVENTIVE MAINTENANCE ..........................4-1
Pump Unit ..................................4-1
SERVICING THE PUMP .............................5-1
Dismantling the Pump Unit .........................5-1
Replacing the Alarm Light LED .......................5-1
Replacing the Audible Alarm ........................5-2
Replacing the On/Off Switch.........................5-2
Replacing the Fuse Holder .........................5-3
Replacing the Pressure Control Assembly .................5-4
Replacing the Alarm Module Assembly ...................5-4
Replacing the Timer Motor/Gear Box Assembly ...............5-5
Replacing the Electric Cord .........................5-5
Replacing the Compressor Air Inlet Sponge Filter ..............5-6
Replacing the Compressor Assembly ....................5-6
Replacing the Compressor Assembly Components .............5-6
Test Equipment Requirements ........................5-8
Test Instructions and Specifications .....................5-8
TECHNICAL SPECIFICATIONS .........................6-1
APPENDIX A ...................................A-1
Wiring Diagram ...............................A-1
Pneumatic Diagram .............................A-1
APPENDIX B ...................................B-1
Parts List...................................B-1
Issue 3 (iii) F048
Mar 2003

Issue 3 (iv) F048
Mar 2003

1 INTRODUCTION
1.1 How To Use This Manual
This manual contains information for servicing the Flowtron®DVT system
which consists of a pump, a pair of compression sleeves and a tubeset. The
manual is partitioned with tabbed dividers for ease of use and consists of the
following sections.
Section 1 Introduction: includes a general description of the operation of
the system and a servicing protocol.
Section 2 Operational Maintenance: describes both functional and static
checks to ensure correct operation during the service life of the
system.
Section 3 Troubleshooting: contains details of fault symptoms, their
possible causes and suggested steps to rectify the problem.
Section 4 Preventive Maintenance: contains a list of parts which must be
periodically replaced to ensure the correct operation of the
system.
Section 5 Servicing the Pump: contains illustrated procedures for
replacing pump components, testing and calibration.
Section 6 Technical Specifications: contains a list of technical data.
Appendix A Diagrams: contains electrical wiring and pneumatic diagrams.
Appendix B Parts List: a list of currently available spare parts.
F048 1-1 Issue 3
Mar 2003

1.2 Technical Description
The Flowtron®DVT System has been specifically designed to provide
prophylactic therapy for patients at risk of developing Deep Vein Thrombosis.
For optimum results it is recommended that Flowtron DVT be applied
pre-operatively and used continuously during the pre-, intra-, and post-operative
periods.
The system comprises :
1. Pressure regulator pump Model AC500/2
2. Suitable patient garments from the Flowtron DVT range
3. L550 Tubeset with snaplock connectors
Pressure regulated pump unit AC500/2 to be used with L550 and Flowtron DVT
garments only.
The pump inflates and deflates the garments on a one-minute cycle
(approximately 12 seconds inflating, 48 seconds deflating). During the cycle,
air is pumped to one outlet followed by the commencement of inflation at the
second outlet approximately 30 seconds later.
The pump unit is piece of precision equipment, and provided that it is handled
and serviced correctly (normally every 12 months), should give long and trouble
free service.
Controls and indicators on the pump unit comprise:
a) Power switch (green rocker switch) illuminated when in the ‘ON’
position
b) Pressure control knob. Pressure adjustment between 20 mmHg
and 60 mmHg
c) Red LED alarm indicator and audible signal indicates LOW and
HIGH pressure faults
Note: The Flowtron DVT pump is fitted with both audible and visual alarm
indicators. When a fault occurs the audible alarm sounds and the
LED illuminates.
F048 1-2 Issue 3
Mar 2003

1.3 Servicing Protocol
1.3.1 General Service - Pump
Initial Assessment (Visual Check):
a) Enclosure for integrity and cleanliness of top and base
b) Fittings for damage and security
c) Labels are secure and legible
Open Pump:
d) Wiring and terminations are secure
e) Tubing security and integrity
f) Components fastenings are secure
g) General condition inside is clean
Open Compressor:
h) Silencer bag weld seams
i) Bellows/armature blade assembly condition
General:
j) Check electric cord assembly for security
k) Clean condition of pump.
If any items in a) - j) appear defective, replace with appropriate spare part and
record action on service record sheet.
Re-assemble pump unit completely.
1.3.2 Testing
The following procedures should be carried out following any repair and as part
of the routine service.
Perform electrical safety checks, pressure, flow and calibration checks and
functional checks as given in Section 5.
Note: It is important to ensure that all tools which are used in servicing are
kept in good condition and test rigs for flow and pressure are regularly
calibrated to a reference gauge with calibration directly traceable to
the appropriate National Standards.
F048 1-3 Issue 3
Mar 2003

F048 1-4 Issue 3
Mar 2003