Identify The Major Parts; Brand And Model-Specific Parts; Attach The Facepiece; Attach The High Or Low Pressure Manifold - Honeywell Posi 3 Setup Manual

1. The breathing apparatus facepiece is put
on the Posi 3 USB's anatomically correct
test head, just as it would be placed on
the head of a person. See section 7.2
below.
2. The appropriate high or low-pressure
manifold is inserted between the cylinder
and the first stage regulator and then
connected to the high-pressure inlet
fitting located at the lower right side on
the front face of the Posi 3 USB. See
section 7.3.
3. If possible, the first stage manifold is
connected from a location downstream of
the first stage regulator and upstream of
the facepiece to the medium pressure
inlet, which is located at the lower left
side on the front panel of the Posi 3 USB.
(See section 7.4)

7.1 Identify the major parts

First identify the three manifolds that are
included with the Posi 3 USB*. Each of the
manifolds comes with a factory label that
identifies it by name and part number.
54-21-A03 Assembly, Manifold, 2250 PSI
The low pressure manifold can be
recognized by its brass T-fitting and black
handwheel. This manifold will be used with
all low pressure SCBA (3000 PSI and below).
54-21-A02 Assembly, Manifold, 4500 PSI
The high pressure manifold can be
recognized by its stainless steel T-fitting and
handwheel. This manifold will be used with
all high pressure SCBA (above 3000 PSI).
35-751 First Stage Manifold
The first stage manifold is a 3-foot long hose
with identical Foster quick disconnect fittings
on each end. A model-specific adapter is
required to connect the first stage manifold to
the breathing apparatus. The adapter must
be obtained from the manufacturer of the
breathing apparatus, and is typically sold in a
kit that also includes the brand-specific
software.

Brand and Model-Specific Parts

In many cases the high or low pressure
manifold (as appropriate for the breathing
apparatus) can be used without any special
parts to connect the air source to the
breathing apparatus and to the Posi 3 USB.
If testing the first stage a model-specific
adapter and the first stage manifold are
necessary to connect the breathing
apparatus to the Posi 3 USB.

7.2 Attach the Facepiece

Position the facepiece squarely on the test
head, and tighten the straps evenly. Make
sure the face piece's inner sealing surface is
flat, sealed to the test head, and that nothing
compromises the integrity of the seal.
Make sure the nose cup is positioned over
and across the test head nose.
Do not connect the second stage regulator to
the facepiece until the software instructs you
to do so. The facepiece must be vented and
open to ambient air pressure when the
facepiece leak test is started.
7.3 Attach the high or low
pressure manifold
1. Turn off the cylinder valve on the SCBA
to be tested and depressurize it by using
the bypass.
2. Disconnect the SCBA from the cylinder.
If the cylinder will not be used as the
pressure source for testing, it can be
removed during testing.
3. Select the manifold that matches the
supply pressure of the SCBA and
connect the handwheel on the single end
of the pressure-reducing manifold to the
Posi 3 USB through the high pressure
inlet fitting located on the lower right front
panel of the Posi 3 USB. Make sure the
handwheel is tight.
must be used to ensure the correct
results during the bypass flow test. Use
of the incorrect manifold can lead to
incorrect bypass flow test results, serious
injury, or death.
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The correct manifold