3M Powerflow 7900PF, Instructions Manual, Page: 93 / 97

Minimum air flow
check fails 1. Filters covered
2. Filter blocked
3. Battery requires
charging
1. Uncover filters
2. Replace filters
3. Charge battery
1. Check Connections
2. Fit fully charged
battery pack
3. Fit replacement
Powered Air Turbo
4. Replace Fuse
1. Tighten clamp
screws
2. Inspect/replace
visor or facepiece
1. Battery connections
2. Battery completely
discharged
3. Powered Air Turbo
failure
4. Battery pack fuse blown
Exhale valve not sealing Replace valve flaps
1. Clamp loose
2. Visor seal damaged
No Air Flow
Face piece leaking
Visor clamp
leaking
STORAGE AND TRANSPORTATION
These products should be stored in the packaging provided in dry, clean
conditions away from direct sunlight, sources of high temperature, petrol and
solvent vapours.
Do not store outside the temperature range -20°C to +50°C or with humidity
above 90%.
When stored as stated, the expected shelf life of the product is 5 years from date
of manufacture.
The original packaging is suitable for transporting the product.
TECHNICAL SPECIFICATION
Respiratory Protection
Nominal Protection Factor = 100
Nominal Protection Factor = 100 in power off state
Outlet Flow Characteristics
Manufacturers Minimum Design Flow (MMDF) 160 l/min
Operating Conditions
-5 to +40ºC and <90 % humidity
Battery Pack
5 hour Battery: 8.4V 4.4Ah, Li-ion rechargable
Ingress Protection
Powered Air Turbo, EN60529 IP54
5x = Dust protection
x4 = Splashing water
Weight
Face piece 570g
Powered Air Turbo, filter and Power cable 270g
Battery Pack 390g
FAULT FINDING
Symptom Remedy Possible Cause
Nose Cup Inhalation Valve Replacement
To Remove the nose cup inhalation valve, grasp the valve and pull the
valve stem out from the valve seat. To replace push the valve stem into
the hole in the valve seat until locked in place. The valve stem should
point away from the face when worn.
Main Inhalation Valve Replacement
The inhalation valve is designed to seal the interface between the
inhalation port on the facepiece and the filters. Remove valve from the
inhalation port. To change the valve diaphragm, push the diaphagm over
the centre post of the inhalation valve. Insert the inhalation valve into the
inhalation port ensuring seal is secured in place.
Exhalation Valve Replacement
Remove the exhalation valve cover by pressing the 2 prongs on either
side of the centre opening and sliding the cover downwards. Remove the
exhalation valve by pulling on the edge of the valve. To replace, push the
new valve down onto the centre post of the valve seat. Replace the
exhalation cover. See Figure 9.
Battery Pack Fuse replacement
See Figure 10.
92