ARJO HUNTLEIGH NIMBUS 4 User manual

Nimbus 4
Nimbus Professional
...with people in mind
Instructions for Use
649933EN Rev 3 • 09/2015

Design Policy and Copyright
® and ™ are trademarks belonging to the ArjoHuntleigh group of companies.
© ArjoHuntleigh AB 2015.
As our policy is one of continuous improvement, we reserve the right to modify designs
without prior notice.The content of this publication may not be copied either whole or in
part without the consent of ArjoHuntleigh AB.
WARNING
To avoid injury, always read this Instructions for Use and accompanied documents
before using the product.
Mandatory to read the Instructions for Use

(i)
Contents
General Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
About this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Intended use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
About Nimbus 4 and Nimbus Professional . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Nimbus Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Nimbus 4 Mattress . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Mattress CPR and Transport Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Nimbus Professional Mattress . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Clinical Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Contraindications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Care of the patient when sitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Preparing the System for Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Installing the Mattress . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Installing the Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Testing the Power Fail Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Connecting the Tubeset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Disconnecting the Tubeset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
System Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Controls, Alarms and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Pump Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Pump Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Installing the System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Inflating the Mattress . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Comfort Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Shut Down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Mattress Vent Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Guidelines for Selecting Mattress Vent Valves to Open . . . . . . . . . . . . . . . . . . . . . 15
Transport Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Deflating the Mattress . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
CPR Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Nimbus Professional Mattress: Patient Positioning Guide . . . . . . . . . . . . . . . . . . 18
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Supine Position (face up) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Prone Position (face down) - Not for Homecare Environment . . . . . . . . . . . . . . . . 20
Decontamination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

(ii)
Routine Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Nimbus 4 and Nimbus Professional Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Nimbus Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Nimbus 4 and Nimbus Professional Mattresses . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Serial Number Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Technical Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

(iii)
GENERAL SAFETY
Before you connect the system pump to a mains socket, read carefully all the installation
instructions contained within this manual.
The system has been designed to comply with regulatory safety standards including:
• EN60601-1:1990/A13:1996 and IEC 60601-1:1988/A2:1995.
• UL60601-1, UL2601-1 and CAN/CSA C22.2 No. 601.1-M90.
• EN60601-1:2006, EN60601-1-11:2010 and IEC 60601-1:2005.
• AAMI/ANSI ES60601-1:2006 and CAN/CSA C22.2 No.60601.1(2008).
Safety Warnings
• It is the responsibility of the care giver to ensure that the user can use this product
safely.
• Whilst the patient is unattended, the decision to use safety sides should be based
on clinical assessment and in line with local policy.
• Alignment of the bed frame, safety sides and the mattress should leave no gap
wide enough to entrap a patient's head or body, or to allow egress to occur in a
hazardous manner where entanglement with the mains power cable and tubeset or
air hoses may result. Care should be exercised to prevent occurrence of gaps by
compression or movement of the mattress. Death or serious injury may occur.
• Make sure that the mains power cable and tubeset or air hoses are positioned to
avoid causing a trip or other hazard, and are clear of moving bed mechanisms or
other possible entrapment areas. The mains power cable of this pump is designed
to allow movement of the bed, and should be fitted into the cable management
flaps along the sides of the mattress, as described in this manual.
• Electrical equipment may be hazardous if misused. There are no user-serviceable
parts inside the pump. The pump's case must only be removed by authorised
technical personnel. No modification of this equipment is allowed.
• The mains power socket/plug must be accessible at all times. To disconnect the
pump completely from the electricity supply, remove the plug from the mains
power socket.
• The CPR control and/or the CPR indicator tag must be visible and accessible at all
times.
• Disconnect the pump from the mains power socket before cleaning and inspecting.
• Keep the pump away from sources of liquids and do not immerse in water.
• Do not use the pump in the presence of uncontained flammable liquids or gasses.
• The cover of this product is vapour permeable but not air permeable and may
present a suffocation risk.
• Do not use the mattress without a cover, it provides a protective barrier.
• Bags supplied with this equipment may present a suffocation risk; to avoid the risk
of suffocation keep the bags away from babies and small children.
• When not fitted to a bed, the bed hooks on the pump may present a hazard to small
children. Store the pump in a safe place.
• Only the pump and mattress or seat combination as indicated by ArjoHuntleigh
should be used. The correct function of the product cannot be guaranteed if
incorrect pump and mattress or seat combinations are used.

(iv)
Precautions
For your own safety and the safety of the equipment, always take the following precautions:
• Placing extra layers between the patient and the mattress potentially reduces the benefits
provided by the mattress and should be avoided or kept to a minimum. As part of sensible
pressure area care, it is advisable to avoid wearing clothing which may cause areas of
localised high pressure due to creases, seams, etc. Creases in the top cover and placing
objects in pockets should be avoided for the same reason.
• Do not expose the system, especially the mattress, to naked flames, such as cigarettes,
etc.
• In the event of a fire, a leak in the seat or mattress could propagate the fire.
• Do not use or store the system in direct sunlight.
• Do not use phenol-based solutions to clean the system.
• Make sure the system is clean and dry prior to use or storage.
• Never use sharp objects or electrically heated under blankets on or under the system.
• Store the pump and mattress in the protective bags supplied.
• Pets and children must be supervised in the vicinity of the system.
• Always make sure the drag handles are fastened to the base cover, when the patient is
NOT being transported.
Electromagnetic Compatibility (EMC)
This product complies with the requirements of applicable EMC Standards. Medical electrical
equipment needs special precautions regarding EMC and needs to be installed in accordance
with the following instructions:
• The use of accessories not specified by the manufacturer may result in increased
emissions by, or decreased immunity of, the equipment, affecting its performance.
• Portable and mobile radio frequency (RF) communications equipment (e.g. mobile/cell
phones) can affect medical electrical equipment.
• If this equipment needs to be used adjacent to other electrical equipment, normal
operation must be checked before use.
• For detailed EMC information contact ArjoHuntleigh service personnel.
Environmental Protection
Incorrect disposal of this equipment and its component parts, particularly batteries or other
electrical components, may produce substances that are hazardous to the environment. To
minimise these hazards, contact ArjoHuntleigh for information on correct disposal.
Expected Service Life
The Nimbus®pump has an expected service life of seven years. To maintain the condition of
the pump, have the pump serviced regularly according to the schedule recommended by
ArjoHuntleigh.
Do NOT use unapproved accessories or attempt to modify, disassemble or otherwise misuse
the Nimbus 4 and Nimbus Professional system. Failure to observe this caution could result in
injury, or in extreme cases, death.
Design Policy and Copyright
® and ™ are trademarks belonging to the ArjoHuntleigh group of companies. As our policy is
one of continuous improvement, we reserve the right to modify designs without prior notice.
The content of this publication may not be copied either whole or in part without the consent
of ArjoHuntleigh.
© ArjoHuntleigh 2015

1
1. Introduction
About this Manual This manual is your introduction to the Nimbus 4 and
Nimbus Professional systems. You must read and fully
understand this manual before using the system.
Use this manual to initially set up the system, and keep
it as a reference for day-to-day routines and as a guide to
maintenance.
If you have any difficulties in setting-up or using the
Nimbus 4 and Nimbus Professional systems, contact
your local ArjoHuntleigh sales office, listed at the end of
this manual.
Intended use The intended use of this product is to prevent and/or
manage pressure ulcers for patients up to 250 kg
(550 lb).
The Nimbus 4 and Nimbus Professional systems should
be used as part of a prescribed plan of care (refer to
“Indications” on page 5).
About Nimbus 4 and
Nimbus Professional
Nimbus 4and Nimbus Professional are highly effective
Dynamic Flotation Systems providing active therapy for
the prevention, treatment and management of pressure
ulcers.
The systems consist of a pump and mattress replacement
which can be used on top of standard hospital and
normal domestic beds. Beds with divided sections for
independent elevation of a patient's head and/or knees
can be adjusted with these mattresses in position.
Both systems use the same Nimbus pump, which has two
operating modes:
• Dynamic mode that cycles the support surface
beneath the patient every 10 minutes providing
periods of pressure relief for the whole body.
• Static mode where the support surface remains
constant (all cells equally inflated).
The Nimbus Professional mattress combines all the
qualities of the Nimbus range of mattresses with the
added benefit of optional head cell deflate; this will
assist the clinician with a range of nursing procedures
including prone nursing, intubation, neck cannulation
and hygiene, while the body of the mattress continues to
provide optimal alternating pressure redistribution.
Both mattresses have been designed with specialised
Vent Valves, so that some of the cells (including the
three head cells on the Nimbus Professional mattress)

2
can be selectively deflated to assist with pressure area
care and patient management.
The mattresses incorporate an advanced AutoMatt®
sensor pad which ensures the patient is automatically
supported at optimum pressures regardless of size,
height, position or weight distribution. Both mattresses
incorporate the five Heelguard®cells at the foot end of
the mattress which ensure that the patient’s heels are
provided with the maximum pressure relief.
If cardiac arrest occurs, the mattresses can be rapidly
deflated using the CPR (Cardio-Pulmonary
Resuscitation) control to allow cardiac resuscitation
procedures to be performed.
A full technical description of the Nimbus 4and Nimbus
Professional system can be found in the Service Manual,
part No. SER0007, available from ArjoHuntleigh.
Nimbus Pump
Front Panel
Run/Standby Button
Alarm Indicators
Tubeset
Mains Power Cable
Carry Handle (recess)
Connector
Comfort Control
Static Control Mute Control

3
Nimbus 4 Mattress
Mattress CPR and Transport Controls
These controls are common to both Nimbus 4 and Nimbus Professional
mattresses, and are located at the foot end of the mattress on the opposite side
to the Vent Valves.
Carry Handle
Securing Strap
5 Heelguard®Cells
3 Head Section Cells
8 Torso Cells 4 Thigh Cells
HEAD END
FOOT END
Drag Handle
Cable Management Flap
5 Vent Valves
CLOSED OPEN
(Constant Pressure)
Detachable Cover
CPR/Transport
Control
Transport Control
Pump Tubeset
CPR
1
3
NORMAL
TRANSPORT
2
FAST DEFLATE
CPR Control
NORMAL
TRANSPORT
Tubeset
Connector

4
Nimbus Professional Mattress
The drag handles enable transportation of a patient in case of emergency. This
is the only situation the drag handles can be unfastened. In any other situation
the drag handles must be fastened to the base cover in order to remove the risk
of tripping.
Carry Handle
Securing Strap
5 Heelguard®Cells
3 Head Section Cells 8 Torso
3 Thigh Cells
HEAD END
FOOT END
Drag Handle
Cable Management Flap
19 Vent Valves
CLOSED OPEN
(Alternating Pressure)
Shoulder Support (4th) Cell
(Alternating, No Vent Valve)
Detachable Cover
CPR/Transport
Control
Cells

5
2. Clinical Applications
Indications The Nimbus 4 and Nimbus Professional systems are
indicated for the prevention and/or management of all
categories1of pressure ulcer, when combined with an
individualised, comprehensive pressure ulcer protocol:
for example, repositioning, nutritional support, skin
care. Selection should be based upon a holistic
assessment of the patient’s individual care needs.
These systems represent one aspect of a pressure ulcer
management protocol; all other aspects of care should be
considered by the prescribing clinician.
If existing wounds do not improve or the patient's
condition changes the overall therapy regimen should be
reviewed by the prescribing clinician.
The above are guidelines only and should not replace
clinical judgement.
The Nimbus 4 and Nimbus Professional mattress is
designed for patients weighing up to 250 kg (550 lb).
Contraindications Do not use Nimbus 4 and Nimbus Professional systems
for patients with unstable spinal fractures.
Cautions If patients have other unstable fractures, or conditions
which may be complicated by a soft or moving surface,
advice should be sought from an appropriate clinician
before use.
While the Nimbus 4 and Nimbus Professional systems
have been designed to manage patients up to the weight
limits indicated above, those approaching this upper
limit are likely to have additional care and mobility
needs and may be better suited to a specialist bariatric
system.
Active therapy (alternating) cushions may be unsuitable
for patients with poor sitting posture or pelvic
deformity; advice from a seating specialist should be
sought.
Care of the patient
when sitting
Seated patients are at increased risk of pressure ulcers
particularly if they are immobile or have wounds over
the seating area. For optimal outcome, provide a
pressure redistributing seat cushion in a chair which
promotes a good sitting posture and has a level base seat
to support the cushion, in addition to an individual
repositioning programme.
Mattress and cushion combinations may have different upper weight limits.
Cushions should be used in combination with pressure-redistributing
mattresses to provide 24-hour therapy.
1. NPUAP/EPUAP International Pressure Ulcer Guideline, 2009.

6
3. Installation
The Nimbus 4 and Nimbus Professional systems are simple to install using the
following guidelines.
Refer to Section 4, Page 10 “Controls, Alarms and Indicators” for a
comprehensive description of the controls and indicators on the pump.
Preparing the
System for Use
Remove the system from the packaging. You should
have the following items:
•Nimbus pump, with integral bed bracket.
• Mains power cable (pump).
•Nimbus 4mattress replacement or
Nimbus Professional mattress replacement with
covers. Do not use the mattress without a cover.
• Tubeset.
Installing the
Mattress
1. Remove the conventional mattress from the bed
frame and check that there are no protruding bed
springs or sharp objects on the bed frame surface.
Heavily ridged bed baseboards may require special
considerations for correct system operation -
consult your ArjoHuntleigh sales office.
2. Unroll the mattress onto the bed base and make
sure that the CPR control is at the foot end, and the
CPR label is hanging freely.
3. Attach the mattress to the bed frame using the new
fastener straps, as shown. These eight fastener
straps can be moved to any of the 10 anchor points
on the base of the mattress, to allow for attaching
the mattress to different types of bed frame.
If the bed has divided sections for independent
elevation of a patient's head and/or knees, attach the
mattress to the movable parts of the bed frame only.
Secure drag handles by fastening them to the base
cover.
4. To make sure that the pressure relieving properties
are not impaired, the mattress cover must not be
pulled tight and covering sheets should fit loosely.
5. Make sure that ALL the Vent Valves are closed:
Closed Open

7
6. Make sure the CPR control is closed and locked in
position and the Transport control is set to
NORMAL.
Installing the Pump 1. If the pump is to be hung from the end of the bed,
make sure that the bed bracket is securely attached
to the pump, and then attach the pump and bed
bracket to the bed frame.
2. Alternatively the pump can be placed underneath
the bed, either upright or lying on its back.
3. Insert one end of the mains power cable into the
receptacle on the pump.
4. Connect the other end of the mains power cable
into a suitable mains power outlet.
Cable Management In order to prevent a trip hazard, the mains power cable
should be put through one of the cable management
flaps which are on each side of the mattress base cover,
as follows:
1. Locate one of the cable management flaps.
2. If necessary, open the press studs along the flap.
CPR
1
3
NORMAL
TRANSPORT
2
FAST DEFLATE
Transport ControlCPR Control
NORMAL
TRANSPORT

8
3. Run the mains power cable along the side of the
mattress securing the flap round the cable using the
press studs.
Testing the Power
Fail Alarm
The Power Fail Alarm is powered by an internal
rechargeable battery. The duration of the alarm will
depend on the level of charge in the battery, which also
depends on the age and condition of the battery.
• The battery has a service life of between five to
seven years. It is not user replaceable and must be
replaced as part of the service procedure.
It is recommended that the alarm is tested when the
pump is installed, as follows:
Refer to Section 4, Page 10 “Controls, Alarms and
Indicators” for a comprehensive description of the
controls and indicators on the pump.
1. Connect the pump to the mains power supply, and
press the Run/Standby button on the pump to put
the pump in the Run mode. Allow it to run for
10-15 seconds.
2. Remove the mains power at the wall socket without
putting the pump into Standby first.
3. The power fail alarm operates within 10 seconds, as
follows:
• The red Alarm triangle flashes.
• The Power indicator flashes.
• An audible warning sounds.
4. The alarm continues until:
• The mains power is resumed.
• You press and hold the Run/Standby button to
put the pump into Standby.
5. If the alarm does not operate, run the pump for
approximately four hours to recharge the battery.
6. Retest the alarm after the battery has been
recharged. Allow the alarm to operate for
Cable
Management
Flap
Press Stud

9
approximately two minutes to ensure that it has
been adequately recharged.
7. If the alarm does not operate for two minutes, call
the service engineer.
If the Power Fail Alarm does not operate after this
test and a service engineer has been called, the
pump can continue to be used with regular checks of
the Power-On status. All other alarms continue to
function as normal.
Connecting the
Tubeset
To connect the tubeset to the mattress and pump:
1. Locate the bottom of the tubeset connector onto the
bottom of the pump/mattress connector.
2. Pull the top of the tubeset connector up and over the
top of the pump/mattress connector, until the
tubeset connector “clicks” into position.
3. Make sure both connections are secure.
Disconnecting the
Tubeset
To disconnect the tubeset from the mattress and pump:
1. Move the tubeset connector down by pulling the
tubeset extrusion downwards, and then pull the
bottom of the tubeset connector away from the
bottom of the pump/mattress connector.
2. Lift the top of the tubeset connector from the top of
the pump/mattress connector.
System Operation The system is now ready for use. Refer to
Section 4, Page 10 “Controls, Alarms and Indicators”
and Section 5, Page 13 “Operation” for day-to-day
operating instructions.
1
2
1
2

10
4. Controls, Alarms and Indicators
Pump Controls The pump front panel has the following controls:
Run/Standby Button Press the Run/Standby button to put the pump into the
Run mode; the Run indicator will change to green.
To put the pump into Standby, press and hold the Run/
Standby button for approximately 3 seconds; this
prevents accidental operation. The Run indicator will be
extinguished.
Static Mode Selects the operating mode, either Static or Dynamic.
When the pump is first powered up, its default setting is
Dynamic mode. To switch to Static mode, press and
hold the Static Mode button for a minimum of 3
seconds. Static mode is confirmed by the illumination of
the button’s yellow indicator.
To return to Dynamic mode, press and hold the button
for a minimum of 3 seconds. Dynamic mode is
confirmed by the extinguishing of the button’s yellow
indicator.
Alarm Mute An Alarm Mute button is provided to silence warning
sounds during an alarm condition. Press and hold the
Alarm Mute button for a minimum of 3 seconds to mute
any alarms.
Alarm Mute is confirmed by the illumination of the
button’s yellow indicator.
The Alarm Mute button does not operate in a Power
Fail condition.
Run/Standby Mute Control
Static Mode Control
ComfortWait
High Pressure
Indicator
Low Pressure
Indicator
Power Fail
Indicator
Service
Indicator ControlIndicator
Button & Indicator
& Indicator
Pump Fault
Indicator
Alarm
Indicator
Run Mode
Indicator

11
Comfort Control The Nimbus 4 and Nimbus Professional systems
automatically compensate for patient weight
distribution and position, to optimise the mattress
pressure relieving performance. However, the mattress
cell pressure can be manually adjusted for patient
comfort using the rotary Comfort Control.
Turn the Comfort Control clockwise for a firmer setting
and counterclockwise for a softer setting.
Pump Indicators The pump front panel has the following indicators:
Run Mode The green Run indicator below the Run/Standby button
is illuminated to confirm the pump is in Run mode.
Static Mode The yellow indicator on the Static button is illuminated
when Static mode has been selected for operation.
Alarm Mute The yellow indicator on the Mute button is illuminated
when an audible alarm has been silenced.
The Alarm Mute button does not operate in a Power
Fail condition.
Wait The Wait indicator is illuminated when the mattress is
being inflated.
The indicator will remain illuminated until the
mattress has been fully inflated.
High Pressure The High Pressure indicator is illuminated whenever the
pump detects high pressure within the mattress.
If this condition occurs, the air supply from the pump is
switched off until normal pressure is detected. After two
seconds of normal pressure being detected the indicator
is switched off and the air supply restarted.
Low Pressure The Low Pressure indicator is illuminated whenever the
pump detects low pressure within the mattress.
This may indicate that there is insufficient pressure to
support a patient or that the Transport control is turned
to the Transport position whilst the pump is on and
connected to the mattress.
The Low Pressure indicator will be switched off once
normal pressure is reached.
Alarm The pump unit incorporates a sophisticated alarm
detection system that differentiates between patient
movement and genuine alarm conditions.
Whenever an alarm condition is detected the red Alarm
triangle starts flashing together with an indicator of the
cause of the alarm. Additionally, an audible warning
will sound, which can be temporarily silenced by

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pressing the Alarm Mute button for a minimum of 3
seconds (Refer to “Alarm Mute” on page 10).
The triangular Alarm symbol is displayed with one or
more of the following indicators:
• Low Pressure (refer to “Low Pressure” on page 11).
• High Pressure (refer to “High Pressure” on page 11).
• Pump Fault (refer to “Pump Fault” on page 12).
• Power (refer to “Power Fail” on page 12).
For all alarm conditions except Power Fail, once
the alarm condition has been detected and
displayed, it can only be cancelled by pressing and
holding the Run/Standby button to put the pump into
Standby.
Refer to Section 9, Page 24 “Troubleshooting” for
possible causes of the above alarm conditions.
Pump Fault The Pump Fault indicator is illuminated when an
internal pump malfunction is detected.
The fault can only be rectified by carrying out a service
on the pump.
Power Fail The Power indicator will flash when a mains power
failure has been detected.
The alarm will continue until:
• The mains power is resumed, or
• You press and hold the Run/Standby button to put
the pump into Standby.
The Power Fail Alarm is powered by a rechargeable
battery. The duration of the alarm will depend on the
level of charge in the battery. The battery may have
become discharged or reached the end of its life; it is
therefore recommended that the alarm is tested before
the pump is used (refer to “Testing the Power Fail
Alarm” on page 8).
If the Power Fail Alarm does not operate after this
test and a service engineer has been called, the
pump can continue to be used with regular checks of
the Power-On status. All other alarms will continue
to function as normal.
Service Indicator The Service Indicator symbol will be illuminated after a
set number of running hours to indicate that the pump is
ready for a service. This service period is set to 12
months run time.
The pump will continue to operate normally even
when the Service Indicator symbol is illuminated.

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5. Operation
These instructions cover day-to-day operation of the system. Other operations, such
as maintenance and repair, should only be carried out by suitably qualified
personnel.
Refer to Section 4, Page 10 “Controls, Alarms and Indicators” for a
comprehensive description of the controls and indicators on the pump.
Installing the System Before using the Nimbus 4 or Nimbus Professional
system make sure that it has been installed correctly in
accordance with Section 3, Page 6 “Installation”.
• The CPR unit on the mattress is closed and locked in
position.
• The Transport control on the mattress is set to
Normal.
• ALL Vent Valves on the mattress are closed.
Inflating the Mattress 1. Connect the pump to the mains power supply using
the supplied cable and press the Run/Standby
button to put the pump into the Run mode; the Run
indicator will change to green.
2. The pump runs a self test for approximately three
seconds then all the indicators on the front panel are
illuminated.
3. When normal operating pressure has been reached,
both the Low Pressure and Wait lights will
extinguish.
It may take up to 15 minutes to inflate the mattress.
However, at the lower end of the operating
temperature range, it may take longer to inflate.
Always wait until both the Low Pressure and Wait
indicators have been extinguished.
4. Place the patient on the mattress in the supine (face
up) position. Refer to Section 6, Page 18 “Nimbus
Professional Mattress: Patient Positioning Guide”.
WARNING
DO NOT PLACE THE PATIENT ON THE MATTRESS UNTIL IT IS
FULLY INFLATED AND NORMAL OPERATING PRESSURE HAS
BEEN REACHED.

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If the operation of the pump changes during use,
refer to Section 9, Page 24 “Troubleshooting”
before calling a service engineer or contacting your
local ArjoHuntleigh sales office.
Comfort Control Adjust the Comfort Control to the patient’s
requirements.
Operating Modes The system has two operating modes:
• Dynamic mode provides the optimum pressure
relieving performance and should be used in most
cases. In Dynamic mode the support surface beneath
the patient is cycled every 10 minutes.
• Static mode provides a stable, non-moving support
surface (all cells are equally inflated).
The pump defaults to the Dynamic operating mode
when first powered up.
Select the required operating mode.
When changing between operating modes, the
patient’s monitoring and repositioning program
should be reviewed.
Shut Down Put the pump into Standby, by pressing and holding the
Run/Standby button for a minimum of 3 seconds; the
Run indicator will be extinguished.
• If the pump needs to be completely isolated from the
mains power supply, remove the plug from the mains
power socket.
Mattress Vent Valves On the Nimbus 4and Nimbus Professional mattresses,
the Vent Valves along the side of the mattress enable
individual cells to be deflated:
1. Nimbus 4 mattress has only five Vent Valves in the
Heelguard section at the foot end of the mattress.
2. Nimbus Professional mattress:
• The three Head Section cells have Vent Valves.
• The eight Torso cells, three Thigh cells and five
Heelguard cells have Vent Valves.
• The single Shoulder Support (4th) cell has no
Vent Valve and cannot be deflated.
3. During system operation, open individual Vent
Valves on the Torso, Thigh and/or Heelguard®
cells to deflate the cell and assist with pressure area
care and patient management, including everyday
interventions such as chest x-rays.