XS Scuba MultiMax User manual

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Owner’s Manual
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Multiple Functions, Maximum Performance

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Owner’s Manual

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Introduction 04
Intended Use and Function 05
Warnings, Cautions and Notes 06
Important Safety Information 07
Enriched Air Nitrox Use 09
Your MultiMax at a Glance 10
Installation 11
Operating the MultiMax 14
- Ination
- Deation
- Use as An Alternate Air Source
+ Clearing
Pre-Dive Inspection 16
Care and Maintenance 18
Dealer Inspection and Service 19
Warranty 20
MultiMax Specications 23
Service Record 24
Table of Contents
To register your MultiMax, please visit www.xsscuba.com/warranty-registration
Copyright Notice
Copyright © 2020 by XS Scuba. All rights
reserved.

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Introduction
Congratulations on your selection of an XS Scuba MultiMax
breathable inator. You join the ranks of those who understand
that use of a breathable inator means one less hose coming o
your rst stage, less risk of entanglement, a more streamlined
prole, and less drag moving through the water.
Your MultiMax is a quality product built to the highest standards.
The MultiMax is a product of quality design and engineering,
material selection, and precise assembly methods. Each unit
is 100% tested, prior to nal packaging, so you know that it is
operating correctly the rst time you use it.
With proper care and maintenance, your MultiMax will continue
to deliver its factory-new performance for many years to come.
XS Scuba hopes that you have many exciting underwater
experiences ahead of you. We are excited to be part of those
adventures.

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Intended Use and Function
The MultiMax is designed to perform the function of a buoyancy
compensator (BC) power inator as well as an alternate air
source, aka an octopus regulator. It attaches to the end of a
BC’s corrugated ination hose. It is powered by a breathing-
quality regulator hose, which runs from the rst stage of the
regulator to the MultiMax, where it connects using a large-ow
connector. This hose is dierent from a traditional inator hose
due to its larger inner diameter which promotes adequate ow
for breathing.
In an unfortunate situation where your buddy runs out of air,
you can provide your buddy with the primary regulator from
your mouth and simply swing the MultiMax into your mouth for
continued breathing. This is a skill that needs to be discussed
prior to the dive, rehearsed and then practiced in the water.

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Warnings, Cautions and Notes
It is important to pay special attention to the information
provided in warnings, cautions and notes, which are
accompanied by the following symbols:
A WARNING indicates any situation that, if not
avoided, could result in serious injury or death.
A CAUTION indicates any situation or technique
that could cause damage to the product, and could
subsequently result in injury to the user.
A NOTE is used to emphasize important points,
tips, and reminders.

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WARNING: Before using the
MultiMax breathable inator, you
must have successfully received
training and certication in the
technique of SCUBA diving from
a recognized training agency
(or any Military or government
operated diving school). Use of
SCUBA equipment by uncertied or
untrained persons is dangerous and
can result in serious injury or death.
WARNING: Before using
the MultiMax, it is important to
completely read and understand
all of the instructions provided
in this owner’s manual. Should
you have any questions or do
not completely understand
these instructions, consult your
Authorized XS Scuba Dealer or
contact XS Scuba directly.
WARNING: Keep your
MultiMax in good working
condition by having it serviced
at least every two years at
an authorized XS Scuba
Dealer. Service, disassembly
or adjustment must not be
attempted by persons who are not
properly trained to work on this
breathable inator.
WARNING: Before diving
with this MultiMax breathable
inator in open water, it is
important to familiarize yourself
Important Safety Information

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with its operation rst in conned shallow water. Do not enter open
water until you have become comfortable with using all its features.
WARNING: Before every dive, perform a complete pre-dive
inspection following the instructions provided in this manual. Check
to ensure that the buttons are functioning properly, and no signs of
damage or leaks are present. If any signs of damage or malfunction
are found, do not dive with the MultiMax until it has received service
from an authorized XS scuba dealer..
WARNING: The MultiMax is designed for use in water that is
50°F / 10°C and above. Use of this breathable regulator in water
temperatures below 50°F / 10°C could result in the regulator freezing
and leading to serious injury or death.
WARNING: The maximum intermediate pressure that can be
supplied to the MultiMax is 160 psi (11 bar). Supply pressure greater
than 160 psi (11 bar) could result in a mouthpiece leak or a freeow
situation.

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Since the MultiMax is essentially a low-pressure device,
operating below 145 psi (10 bar), there is no concern about
using it with enriched air nitrox. It is not held to the same rigid
standards as a regulator’s rst stage would be.
Enriched Air Nitrox Use

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Your MultiMax at a Glance
High-ow hose
Oral ination /
deation button
Corrugated hose
connector with cable
retaining pin
Quick-connect tting
Dust cap
Power ination button
Purge
Fig. 1

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Installation
CAUTION: These instructions
are provided as a reference to
those familiar with the assembly
of scuba equipment. It is strongly
recommended that a professional
dive store, or scuba technician,
perform the installation and nal
check of the MultiMax.
WARNING: The MultiMax’s
supply hose must be threaded into
an intermediate pressure (IP) port,
sometimes referred to as a low
pressure or medium pressure port,
on the regulator rst stage. While
its size and threads should not be
compatible with a high-pressure
port on a modern rst stage, there
are older models and adapters that
would allow this mistake to be made.
1. If attached, remove the supply
hose from the MultiMax by
grasping the collar of the
connection and sliding it away
from the unit.
2. Using the appropriate size hex
key, remove the desired IP port
plug from the regulator rst
stage, keeping in mind that this
hose should come over your
left shoulder. (Fig. 2a)
3. Make certain that the o-ring is
present at the base of the hose
threads. (Fig. 2b) Thread the
hose into the IP port by hand
until tight. Torque to 40 in/lbs
(4.5Nm) with a 9/16” wrench.
(Fig. 2c)

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4. If you have an existing inator
on your BC, remove it.
a. If it is clamped with one
or two disposable tie wraps,
carefully snip them with side
cutter pliers, avoiding contact
with the corrugated hose.
b. Pull or twist the inator
from the corrugated hose.
NOTE: In some cases,
the inator may be glued in
place with rubber cement.
If this is the case, work a
screwdriver or similar at tool
under the hose to break the
glue bond.
c. Your BC airway may have
an internal cable attached to
Fig. 2b
Fig. 2c
Fig. 2a

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the corrugated hose connector
of the inator. This is to
operate the dump valve on the
left shoulder. Using an awl, or
similar tool, push out the cable
retaining pin to free the cable
from the inator. (Fig. 3)
5. The connector on the
MultiMax is designed to
attach to a 3/4” (19 mm) inner
diameter corrugated hose.
Again, using an awl or similar
tool, push out the cable
retaining pin halfway. Loop
the eye of the cable over the
retaining pin and insert the
pin back into the hole on the
connector. The pin should
now be ush with the outside
wall of the connector. (Fig. 4)
6. While keeping the cable
retaining pin stationary, slide
the corrugated hose over the
connector of the MultiMax.
Fig. 3
Fig. 4
Pin should be ush with the outside
wall of the connector

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7. Secure the corrugated hose
using the “no-bump” tie wrap
that came with your MultiMax,
or a common nylon tie wrap.
Operating the MultiMax
1. Ination
a. Just as with a standard BC
power inator, there are two
options for adding air to your
BC. You can use the smaller,
blue power inator button or
the larger, gray oral ination
button.
i. Power ination, is the most
common. Simply depress the
blue button in short bursts,
as needed, to route air from
you cylinder into your BC.
ii. Oral ination, which is
less common, is done by
placing your mouth over the
mouthpiece, fully depressing
the large, gray oral button,
and exhaling air into the
mouthpiece. Release the
button to capture the
exhaled air. Fully depressing
the large, gray button seals
o the regulator exhaust
valve so that exhaled air will
be routed into the BC.
2. Deation
a. There are multiple ways to
dump air from a BC, two of
which can be done with the
MultiMax.
i. Cable-activated rapid
exhaust valve – Grasp the

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MultiMax, being careful not to
depress either of the buttons,
and pull downward. This will
pull on the internal cable
inside of the corrugated hose,
causing the rapid exhaust
valve at the top of the airway
to release air.
ii. Manual deation out the
mouthpiece – This less
common method requires
that the diver be in a vertical
orientation. With your left
hand, hold the MultiMax
above the BC. Depress the
large, gray ination/deation
button, allowing air to escape
out of the mouthpiece.
Release the button to close
the valve.
NOTE: While using
method ii, do not continue
depressing the oral button
after all the air has escaped
the BC. Doing so will allow
water to enter the BC.
3. Use as An Alternate Air
Source
a. The MultiMax is a fully-
functional second stage
regulator and may be used
as an alternate air source in
an emergency situation. To
breathe, put the mouthpiece
in your mouth. Purge the
water by either pressing the
purge button, or exhaling prior
to inhaling.
b. You should test the
breathing performance of the

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MultiMax before each dive.
c. In the event of an
emergency air sharing
situation, the assisting diver
should oer their primary
second stage to the diver
requesting to share air. The
MultiMax then becomes the
primary regulator for the
assisting diver.
d. Using the MultiMax in
an emergency causes no
variation to the buoyancy
capability of the vest.
e. While using the MultiMax as
your second stage regulator,
all ination and deation
procedures as outlined in this
manual are still applicable.
WARNING: Never push
the deation button during
use of the MultiMax as a
breathing device. This
leads to breathing the gas that
is inside your BC, which could
be low in oxygen content,
contaminated or harmful.
Pre-Dive Inspection
1. Inspect the MultiMax and
the associated hoses for any
sign of damage. If damage is
found, do not dive.
2. After conrming that the
inator hose is rmly
attached, slowly open your
cylinder and pressurize the
Multimax.

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3. Operate the power inate
(blue) button and blow some
pus of air into the BC using
the oral inate (gray) button as
outlined above.
4. Operate the purge valve to
verify a strong, high-ow
purge. The regulator should
not continue to ow once the
purge button is released. It
should be silent.
5. Breathe o the MultiMax. It
should deliver an adequate
volume of air with little eort.
Afterward, it should not leak
air. It should be silent.
6. Close the cylinder valve and
purge the remaining air in the
hoses. Place the MultiMax in
your mouth and try to inhale.
This should create a vacuum
in the MultiMax. There should
be no sensation of air
owing into the device. An
airow may indicate a leak in
the mouthpiece, large
inhalation diaphragm or the
exhaust valve. If a leak is
detected, do not dive until
repaired.
7. If the MultiMax passes the
steps above, reopen the
cylinder valve in preparation
for your dive.

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Care and Maintenance
1. Soak, or rinse, in fresh water
a. Unit pressurized:
i. Ideally, you should leave
your MultiMax pressur-
ized with air and soak
it in warm, fresh water.
While still pressurized,
cycle each of the buttons
repeatedly.
ii. If a warm water soak is
not available, rinse with
tap water from a garden
hose with a low-pressure
nozzle. Let the water ow
into the mouthpiece and
out the exhaust port
b. Unit unpressurized:
i. Soak or rinse with tap
water from a garden
hose with a low-pressure
nozzle. Let the water ow
into the mouthpiece and
out the exhaust port.
ii. Do not depress the
purge button! Depressing
the purge button allows
water to back ow into
the breathing valve. This
can leave mineral depos-
its and/or contaminants.
This can accelerate the
time until the next service.
2. After rinsing, shake any
excess water out of the unit.

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If still pressurized, operate
the purge button and power
inate button to blow out any
excess water. Towel dry.
3. Do not store the MultiMax with
air pressure supplied to it.
4. Whenever you remove the QD
inator hose, be sure to install
the protective inlet cap. This
keeps water and contami-
nants from entering the inlet
and reaching the breathing
valve (see 1.b.ii above).
5. Store the MultiMax in a
ventilated, cool, dry place, out
of direct sunlight.
CAUTION: DO NOT
store your regulator in a hot
environment or near an
electric motor, which
produces ozone. Prolonged
exposure to heat, ozone,
chlorine fumes or ultraviolet
rays can cause premature
degradation of your regula-
tor’s soft parts and hoses.
Dealer Inspection and
Service
Do not assume that your MultiMax
is in good working order because
it has received little use since its
last servicing. Storage can be
hard on a breathable inator as
seals and other soft parts can
take a set and dry out.

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You must obtain factory
authorized service from an
XS Scuba Dealer at least once
every two years. Your MultiMax
may require more frequent
service depending on the amount
of use it receives and the type of
environmental conditions that it is
subjected to.
WARNING: Be sure to
have your regulator serviced
at least once every two years
by an XS Scuba Dealer.
Your personal safety and the
mechanical integrity of your
MultiMax may depend on it.
WARNING: Do not
attempt to disassemble, or
repair, the MultiMax.
Disassembly and service of
the MultiMax must only be
performed by an authorized,
XS Scuba repair technician, or
by the factory.
Warranty
XS Scuba oers a 2-Year
Limited Warranty against defects
in material and workmanship on
the MultiMax.
This warranty is limited and
subject to the following
restrictions:
1. The warranty is oered to the
original owner only
2. The MultiMax must have been
purchased from an authorized
XS Scuba dealer.