Miller 20180812410001 Owner's manual

Brand: Miller

Model: 20180812410001

Category: Welding System

Type: Owner's manual

This manual is also suitable for

Description

Supplied Air Respirator

OM-269676C 2019-07

File: Accessory

C50 Supplied Air Respirator

(SAR)

To help us serve you better, go to www.MillerWelds.Com/Register

For product information,

Owner’s Manual translations,

and more, visit

www.MillerWelds.com

Miller Electric manufactures a full line

of welders and welding-related equipment.

For information on other quality Miller

products, contact your local Miller distributor to receive the latest full

line catalog or individual specification sheets. To locate your nearest

distributor or service agency call 1-800-4-A-Miller, or visit us at

www.MillerWelds.com on the web.

Thank you and congratulations on choosing Miller. Now you can

get the job done and get it done right. We know you don’t have

time to do it any other way.

That’s why when Niels Miller first started building arc welders in

1929, he made sure his products offered long-lasting value and

superior quality. Like you, his customers couldn’t afford anything

less. Miller products had to be more than the best they could be.

They had to be the best you could buy.

Today, the people that build and sell Miller products continue the

tradition. They’re just as committed to providing equipment and

service that meets the high standards of quality and value

established in 1929.

This Owner’s Manual is designed to help you get the most out of

your Miller products. Please take time to read the Safety

Precautions. They will help you protect yourself against potential

hazards on the worksite. We’ve made installation and operation

quick and easy. With Miller, you can count on years of reliable

service with proper maintenance. And if for some reason the unit

needs repair, there’s a Troubleshooting section that will help you

figure out what the problem is, and our extensive service network is

there to help fix the problem. Warranty and maintenance

information for your particular model are also provided.

Working as hard as you do

− every power source from

Miller is backed by the most

hassle-free warranty in the

business.

From Miller to You

Mil_Thank2

2019−01

TABLE OF CONTENTS

SECTION 1 − SAFETY PRECAUTIONS − READ BEFORE USING 1.................................

1-1. Symbol Usage 1.......................................................................

1-2. Breathing Air Hazards 1.................................................................

1-3. Arc Welding Hazards 2.................................................................

1-4. Lens Shade Selection Table 3............................................................

1-5. Proposition 65 Warnings 3...............................................................

1-6. Principal Safety Standards 3.............................................................

SECTION 2 − NIOSH INFORMATION 4..........................................................

2-1. NIOSH Approval Information 4...........................................................

2-2. NIOSH Approval Label 4................................................................

2-3. NIOSH Cautions And Limitations 5........................................................

SECTION 3 − C50 AIR REGULATOR ASSEMBLY 6...............................................

3-1. C50 Air Regulator Specifications 6........................................................

3-2. Air Supply Specifications 6..............................................................

3-3. Air Pressure Specifications For Miller Supplied Air Hose 6....................................

3-4. Supplied Air System Components 7.......................................................

3-5. Attaching Breathing Tube To Welding Helmet Head Assembly And Regulator Adapter 8...........

3-6. Attaching Adapter To Regulator 9.........................................................

3-7. Connecting Airline Hose To Regulator 10....................................................

3-8. Adjusting Regulator Airflow 11............................................................

3-9. Checking The Respirator Before Use 11....................................................

3-10. Putting On The Respirator 12.............................................................

3-11. Replacing Belt Pad 13...................................................................

3-12. Respirator Maintenance 13...............................................................

3-13. Respirator T

roubleshooting

14............................................................

SECTION 4 − WELDING HELMET HEAD ASSEMBLY 15...........................................

4-1. Specifications 15........................................................................

4-2. Helmet Configuration 15..................................................................

4-3. Helmet Controls 16......................................................................

4-4. Mode Button And Grind / Low Battery Light 16...............................................

4-5. Mode Control Settings 17.................................................................

4-6. Variable Shade Control 18................................................................

4-7. Lens Delay Control 18...................................................................

4-8. Sensitivity Control 19....................................................................

4-9. Typical Lens Adjustment Procedure 20.....................................................

4-10. Info Control Button 21....................................................................

4-11. Clock Control 21........................................................................

4-12. Arc Time And Arc Count Control 22........................................................

4-13. Adjusting Headgear 22...................................................................

4-14. Replacing Lens Covers 23................................................................

4-15. Replacing Grinding Shield On T94i Helmet 24...............................................

4-16. Replacing The Battery 24................................................................

4-17. Installing Optional Magnifying Lens 25......................................................

4-18.

Maintenance

25.........................................................................

4-19. T

roubleshooting

26......................................................................

SECTION 5 − PARTS LIST 27...................................................................

SECTION 6 − WARRANTY 29...................................................................

OM-269676 Page 1

SECTION 1 − SAFETY PRECAUTIONS − READ BEFORE USING

SAR 2018-06

Protect yourself and others from injury — read, follow, and save these important safety precautions and operating instructions.

1-1. Symbol Usage

DANGER! − Indicates a hazardous situation which, if

not avoided, will result in death or serious injury. The

possible hazards are shown in the adjoining symbols

or explained in the text.

Indicates a hazardous situation which, if not avoided,

could result in death or serious injury. The possible

hazards are shown in the adjoining symbols or ex-

plained in the text.

NOTICE − Indicates statements not related to personal injury.

. Indicates special instructions.

This group of symbols means Warning! Watch Out! ELECTRIC

SHOCK, MOVING PARTS, and HOT PARTS hazards. Consult sym-

bols and related instructions below for necessary actions to avoid

these hazards.

1-2. Breathing Air Hazards

The symbols shown below are used throughout this manual

to call attention to and identify possible hazards. When you

see the symbol, watch out, and follow the related instructions

to avoid the hazard. The safety information given below is

only a summary of the more complete safety information

found in the Principal Safety Standards listed in Section 1-6.

Read and follow all Safety Standards.

Only qualified persons should install, operate, maintain, and

repair this equipment. A qualified person is defined as one

who, by possession of a recognized degree, certificate, or

professional standing, or who by extensive knowledge, train-

ing and experience, has successfully demonstrated the

ability to solve or resolve problems relating to the subject

matter, the work, or the project and has received safety train-

ing to recognize and avoid the hazards involved.

During operation, keep everybody, especially children, away.

BREATHING UNFILTERED AIR can be

hazardous.

Welding produces fumes and gases. Misuse of the

supplied air respirator (SAR) may expose you to

fumes and gases hazardous to your health.

D Read and follow these instructions and the safety labels carefully.

The supplied air respirator is intended only for welding applica-

tions. The supplied air respirator helps protect the user from

specific airborne contaminants but must be used correctly to be

fully effective. Have an industrial hygienist test the air in your facili-

ty to ensure the supplied air respirator provides adequate

protection from contaminants in your environment. If you have

questions about the supplied air respirator, see equipment NIOSH

label and consult your Safety Director and a certified Industrial Hy-

gienist. For occupational use applications, employers must

implement a written respiratory protection program meeting the re-

quirements of OSHA 29 CFR 1910.134 (USA) or CSA Z94.4

(Canada), and other substance specific requirements as applicable.

D Do not use the supplied air respirator until you have been trained in

its proper operation by a qualified person.

D Follow all applicable ANSI, OSHA, CSA, CGA, and other regulato-

ry guidelines pertaining to the use of supplied air respirators.

D Do not use the supplied air respirator where there is danger of fire

or explosion.

D Do not use the supplied air respirator in applications immediately

dangerous to life or health (IDLH).

D Do not use the supplied air respirator in windy conditions, or nega-

tive pressure inside the hood can draw in contaminants from the

outside air.

D Use the supplied air respirator only in NIOSH-approved atmos-

pheres. Do not use the supplied air respirator in confined spaces,

where oxygen levels are 19.5% or lower, where contaminant levels

are unknown or are immediately dangerous to life or health, where

contaminant

levels exceed supplied air respirator specifications,

in areas that are poorly ventilated, or where escape is not possible

without using the supplied air respirator.

D Do not enter a hazardous area until you are sure the supplied air

respirator is assembled correctly, working properly, and worn

properly.

D Before each use, inspect the supplied air respirator for damage

and verify it operates properly. Before using the supplied air respi-

rator, test the air flow to verify the supplied air respirator is receiving

an adequate volume of air. Clean and maintain the supplied air res-

pirator according to the manufacturer’s instructions.

D Do not use the supplied air respirator without all components or

with the air supply turned off because hazardous levels of oxygen

and carbon dioxide can accumulate in the helmet.

D Always wear the supplied air respirator when entering a contami-

nated area. Do not remove the supplied air respirator until outside

the contaminated area.

D Dangerous contaminants may not smell or be visible. Leave the

area immediately if you notice any of the following:

Breathing becomes difficult....

You experience dizziness, impaired vision, or eye, nose, or ...

mouth irritation.

The air supply smells or tastes unusual....

The air supply equipment alarm sounds....

The equipment is damaged....

Air flow decreases or stops....

If you think the equipment is not supplying adequate...

protection.

Do not remove the equipment until you are in a safe area.

D Do not repair, modify, or disassemble the supplied air respirator or

use with parts or accessories not supplied by the manufacturer.

Use only those components that are part of the NIOSH-approved

assembly.

D The supplied air respirator must be used with the helmet, hood,

hoses, connectors, filters, and other components recommended

by the manufacturer to provide a NIOSH-approved respirator sys-

tem. See the NIOSH label for information on the required

equipment.

D Do not use the supplied air respirator belt and shoulder straps as a

safety harness.

D The supplied air respirator does not clean or filter contaminants

from the air. Breathable air must be supplied to the supplied air res-

pirator and meet the requirements of Grade D breathing air as

described in Compressed Gas Association Commodity Specifica-

tion G.7.1 (United States) or CSA Standard Z180.1 (Canada). Use

appropriate

filters and carbon monoxide alarms to ensure breath-

able air is supplied.

D Have a qualified person test the breathing air to ensure it meets

Grade D requirements. Breathing air testing shall be done in accor-

dance with a written respirator protection program (prepared by a

qualified person) specific to the workplace.

D Locate the compressed air source in a clean environment that is free

from toxic fumes and gases and away from other sources of contami-

nation, such as building exhaust vents and engine-powered vehicles

and equipment (including generators). Be sure inlet on compressed

air source is properly filtered to remove contaminants.

D Use only air line couplings designed for the supplied air respirator; air

couplings must be incompatible with outlets for other gas systems.

OM-269676 Page 2

D Do not connect the supplied air respirator to unbreathable

(non-Grade D) air sources.

D To ensure adequate cooling of supply air, follow air compressor

manufacturer’s recommendations when selecting air hose length.

Do not use an air compressor that supplies air warmer than 160°F

(71°C); supply air exceeding this temperature will degrade the air

hose, which could adversely affect the supplied air respirator’s

performance.

D Operate supplied air respirator within specified air pressures and

air hose lengths. The air supply system (air supply lines, fittings,

filters, couplings, air pump/tanks) must be able to deliver sufficient

air volume within safe limits, 125 psig (862 kPa) maximum. If cor-

rect air pressure is not maintained, negative air pressure can

develop in the helmet and create a risk of contaminants being in-

haled. Also, unless removed by filters, oil, water, and other

contaminants could flow downstream from the compressed air

source and adversely affect the supplied air respirator’s perfor-

mance. While air is flowing, use a reliable pressure gauge to

continually monitor air pressure at the air source connection point.

1-3. Arc Welding Hazards

Arc rays from the welding process produce intense

visible and invisible (ultraviolet and infrared) rays that

can burn eyes and skin. Sparks fly off from the weld.

D Wear a welding helmet fitted with a proper shade of filter to

protect your face and eyes when welding or watching (see

ANSI Z49.1 and Z87.1 listed in Safety Standards). Refer to

Lens Shade Selection table in Section 1-4.

D Wear approved safety glasses with side shields under your

helmet.

D Use protective screens or barriers to protect others from flash,

glare, and sparks; warn others not to watch the arc.

D Wear body protection made from durable, flame−resistant

material (leather, heavy cotton, wool). Body protection

includes oil-free clothing such as leather gloves, heavy shirt,

cuffless trousers, high shoes, and a cap.

D Before welding, adjust the auto-darkening lens sensitivity

setting to meet the application.

D Stop welding immediately if the auto-darkening lens does not

darken when the arc is struck. See the Owner’s Manual for

more information.

ARC RAYS can burn eyes and skin.

WELDING HELMETS do not provide

unlimited eye, ear and face protection.

Arc rays from the welding process produce intense vis-

ible and invisible (ultraviolet and infrared) rays that can

burn eyes and skin. Sparks fly off from the weld.

D Use helmet for welding/cutting applications only. Do not use

helmet for laser welding/cutting.

D Use impact resistant safety spectacles or goggles and ear

protection at all times when using this welding helmet.

D Do not use this helmet while working with or around explosives

or corrosive liquids.

D Do not weld in the overhead position while using this helmet.

D Inspect the auto-lens frequently. Immediately replace any

scratched, cracked, or pitted cover lenses or auto-lenses.

NOISE can damage hearing.

Noise from some processes or equipment can

damage hearing.

D Wear approved ear protection if noise level is high.

FUMES AND GASES can be hazardous.

Welding produces fumes and gases. Breathing

these fumes and gases can be hazardous to your

health.

D Keep your head out of the fumes. Do not breathe the fumes.

D Ventilate the work area and/or use local forced ventilation at the arc

to remove welding fumes and gases. The recommended way to

determine adequate ventilation is to sample for the composition

and quantity of fumes and gases to which personnel are exposed.

D Read and understand the Safety Data Sheets (SDSs) and the

manufacturer’s instructions for adhesives, coatings, cleaners,

consumables, coolants, degreasers, fluxes, and metals.

D If ventilation is poor, wear an approved supplied air respirator.

D Work in a confined space only if it is well ventilated, or while

wearing a supplied air respirator. Always have a trained watchper-

son nearby. Welding fumes and gases can displace air and lower

the oxygen level causing injury or death. Be sure the breathing air

is safe.

D Do not weld in locations near degreasing, cleaning, or spraying op-

erations. The heat and rays of the arc can react with vapors to form

highly toxic and irritating gases.

D Do not weld on coated metals, such as galvanized, lead, or

cadmium plated steel, unless the coating is removed from the weld

area, the area is well ventilated, and while wearing a supplied air

respirator. The coatings and any metals containing these elements

can give off toxic fumes if welded.

READ INSTRUCTIONS.

D Read and follow all labels and the Owner’s

Manual carefully before installing, operating, or

servicing unit. Read the safety information at

the beginning of the manual and in each

section.

D Use only genuine replacement parts from the manufacturer.

D Perform installation, maintenance, and service according to the

Owner’s Manuals, industry standards, and national, state, and

local codes.

HOT PARTS can burn.

D Do not touch hot parts bare handed.

D Allow cooling period before working on

equipment.

D To handle hot parts, use proper tools and/or wear heavy, insu-

lated welding gloves and clothing to prevent burns.

OM-269676 Page 3

1-4. Lens Shade Selection Table

Process

Electrode Size

in. (mm)

Arc Current in

Amperes

Minimum Protective

Shade No.

Suggested Shade

No. (Comfort)*

Shielded Metal Arc

Welding (SMAW)

Less than 3/32 (2.4)

3/32−5/32 (2.4−4.0)

5/32−1/4 (4.0−6.4)

More than 1/4 (6.4)

Less than 60

60−160

160−250

250−550

−−

Gas Metal

Arc Welding (GMAW)

Flux Cored

Arc Welding (FCAW)

Less than 60

60−160

160−250

250−500

−−

Gas Tungsten Arc Weld-

ing (TIG)

Less than 50

50−150

150−500

Air Carbon

Arc Cutting (CAC-A)

Light

Heavy

Less than 500

500−1000

Plasma Arc

Cutting (PAC)

Less than 20

20−40

40−60

60−80

80−300

300−400

400−800

Plasma Arc Welding

(PAW)

Less than 20

20−100

100−400

400−800

6−8

Reference: ANSI Z49.1:2012

* Start with a shade that is too dark to see the weld zone. Then, go to a lighter shade which gives a sufficient view of the weld zone without going below

the minimum.

1-5. Proposition 65 Warnings

WARNING: Cancer and Reproductive Harm − www.P65W

arnings.ca.gov

1-6. Principal Safety Standards

Safety in Welding, Cutting, and Allied Processes, ANSI Standard Z49.1,

is available as a free download from the American Welding Society at

http://www.aws.org or purchased from Global Engineering Documents

(phone: 1-877-413-5184, website: www

.global.ihs.com).

Safe Practice For Occupational And Educational Eye And Face Protec-

tion, ANSI Standard Z87.1, from American National Standards Institute,

25 West 43rd Street, New York, NY 10036 (phone: 212-642-4900, web-

site: www.ansi.org).

NIOSH Approval of Respiratory Devices, CFR Title 42 − Public Health,

Part 84, is available from the Centers for Disease Control, 1600 Clifton

Rd. Atlanta, GA 30329−4027 (phone: 800−232−4636) or as a free

download at www.cdc.gov/niosh.

OSHA, Occupational Safety and Health Standards for General Indus-

try, Title 29, Code of Federal Regulations (CFR), Part 1910.177 Subpart

N, Part 1910 Subpart Q, and Part 1926, Subpart J, from U.S. Govern-

ment Printing Office, Superintendent of Documents, P.O. Box 371954,

Pittsburgh, PA 15250-7954 (phone: 1-866-512-1800) (there are 10 OS-

HA Regional Offices—phone for Region 5, Chicago, is 312-353-2220,

website: www.osha.gov).

American National Standard for Respiratory Protection, ANSI /ASSE

Standard Z88.2−2015, from American National Standards Institute, 25

West 43rd Street, New York, NY 10036 (phone: 212-642-4900,

website: www.ansi.org).

Selection, Use, and Care of Respirators, CAN/CSA Standard Z94.4,

from Canadian Standards Association, Standards Sales, 5060 Spec-

trum Way, Suite 100, Mississauga, Ontario, Canada L4W 5NS (phone:

800-463-6727, website: www.csagroup.org).

Commodity Specification for Air, CGA Pamphlet G-7.1, from

Compressed Gas Association, 14501 George Carter Way, Suite 103,

Chantilly, VA 20151 (phone: 703-788-2700, website:www.cganet.com).

Compressed Breathing Air and Systems, CSA Standard Z180.1, from

Canadian Standards Association, Standards Sales, 5060 Spectrum

Way, Suite 100, Mississauga, Ontario, Canada L4W 5NS (phone:

800-463-6727, website: www.csagroup.org).

OM-269676 Page 4

SECTION 2 − NIOSH INFORMATION

2-1. NIOSH Approval Information

See the NIOSH approval label in Section 2-2 or contact Miller Electric Mfg. LLC for additional information, including a listing of the components of

the NIOSH approved SAR respiratory system.

2-2. NIOSH Approval Label

OM-269676 Page 5

2-3. NIOSH Cautions And Limitations

A Not for use in atmospheres containing less than 19.5 percent oxygen.

B Not for use in atmospheres immediately dangerous to life or health.

C Do not exceed maximum use concentrations established by regulatory standards.

D Air line respirators can be used only when the respirators are supplied with respirable air meeting the requirements of CGA G7.1 Grade D

or higher quality.

E Use only the pressure ranges and hose lengths specified in the User’s Instructions.

J Failure to properly use and maintain this product could result in injury or death.

M All approved respirators shall be selected, fitted, used, and maintained in accordance with MSHA, OSHA, and other applicable regula-

tions.

N Never substitute, modify, add, or omit parts. Use only exact replacement parts in the configuration as specified by the manufacturer.

O Refer to User’s Instructions, and/or maintenance manuals for information on use and maintenance of these respirators.

S Special or critical User’s Instructions and/or specific use limitations apply. Refer to User’s Instructions before donning.

S − Special or Critical Use Instructions

Each C50 Air Regulator Assembly includes an air regulator with adapter, quick disconnect, heat pad, and belt assembly. See Section 2-2 for a list

of equipment approved for use with the supplied air respirator.

See Section 3 for special operating instructions.

C50 AIR REGULATOR ASSEMBLY

OM-269676 Page 6

SECTION 3 − C50 AIR REGULATOR ASSEMBLY

This equipment helps protect the user from certain contaminants. All users must read and understand these instructions and be

trained in the proper use of this equipment before using. Use this equipment according to all applicable health and safety standards.

If you have questions about the type of respiratory equipment required, consult your safety director and an Industrial Hygienist.

Do not enter a hazardous area until you are sure the supplied air respirator and air filtration system are assembled correctly, working

properly, and the respirator is worn properly.

. See Section 4 for information on the auto-darkening helmet assembly.

The Type C supplied air respirator (SAR) is designed for use as respiratory protection during entry into and escape from atmospheres not immediately

dangerous to life or health. When used with the equipment intended for use with this product, the respirator system generates a positive air pressure

to help prevent contaminants from entering the hood. The respirator does not clean or filter contaminants from the air. The system must be connected

to a source of respirable breathing air and be used with the equipment listed below:

D Helmet assembly

D C50 Air regulator and adapter

D Breathing tube assembly

D Belt assembly

D Airline hose

D Detachable couplings

The C50 air regulator can reduce air temperatures up to 50°F (28°C). See Section 2-2 for a list of equipment approved for use with the supplied air

respirator.

3-1. C50 Air Regulator Specifications

Size (Regulator And Adapter) 12 x 1-1/8 x 1-3/4 in. (305 x 29 x 44 mm)

Weight (Regulator And Adapter) 12.8 oz (363 g)

Maximum Hose Length (Total Length Of Connected Hoses) 300 ft (91 m)

Minimum Hose Length 25 ft (7.6 m)

Operating T

emperature

23° to 104°F (−5° to 40°C)

Storage T

emperature

14° to 122°F (−10° to 50°C)

Belt size 28–55 in. (711–1397 mm)

18 in. (457 mm) Additional Length With Belt Extension (Part No. 244151)

3-2. Air Supply Specifications

Breathable

air must be supplied to the supplied air respirator and meet the requirements of Grade D breathing air as described in Compressed Gas

Association Commodity Specification G.7.1 (United States) or CSA Standard Z180.1 (Canada). The air supply must be able to deliver 6−15 SCFM

(170−425 lpm) to operate the air regulator at the recommended pressures.

S− Special or Critical Use Instructions

3-3. Air Pressure Specifications For Miller Supplied Air Hose

The air hoses listed below are approved for use with the supplied air respirator. Up to three hoses may be connected in any combination but total hose

length shall not exceed 300 ft (91 m).

Straight Airline Hose

Allowable Connections Total Hose Length Pressure

1 Hose 25–100 ft (7.6 − 30.5 m) 58–61 psi (400–421 kPa)

2 Hoses 125–200 ft (38.1 − 61 m) 64–68 psi (441–469 kPa)

3 Hoses 225–300 ft (68.6 − 91 m) 70–76 psi (483–524 kPa)

Coiled Airline Hose

Allowable Connections Total Hose Length Pressure

1 Hose 25−100 ft (7.6–30.5 m) 60–62 psi (414–427 kPa)

C50 AIR REGULATOR ASSEMBLY

OM-269676 Page 7

3-4. Supplied Air System Components

1 Welding Helmet Assembly

2 Breathing Tube Assembly

(Cover Not Shown)

3 Belt Assembly

4 C50 Regulator Assembly

5 Airline Hose With Quick Dis-

connect

Ref. 805068

Notes

Work like a Pro!

Pros weld and cut

safely. Read the

safety rules at

the beginning

of this manual.

C50 AIR REGULATOR ASSEMBLY

OM-269676 Page 8

3-5. Attaching Breathing Tube To Welding Helmet Head Assembly And Regulator Adapter

! Be sure breathing tube is

properly installed or con-

taminated air may enter the

helmet.

Connecting Breathing Tube To

Helmet

1 Locking Tab

Push breathing tube connector

(rectangular end) into helmet air

inlet until breathing tube locks in

position. (Locking tab should be

on outside of helmet air inlet.)

. Do not insert breathing tube

locking tab into helmet inlet.

Locking tab should be on out-

side of helmet air inlet.

Connecting Breathing Tube To

Regulator Adapter

2 Breathing Tube Connector

3 Regulator Adapter

4 Breathing Tube Cover (Not

Shown)

. See Parts List in Section 6 for

breathing tube cover.

Align pins on breathing tube con-

nector with channels in regulator

adapter. Insert tube connector in-

to regulator receptacle until snug

and then turn connector 1/8 turn

clockwise.

Install cover on breathing tube.

T94 Helmet and T94i Helmet

Tab Connector

C50 AIR REGULATOR ASSEMBLY

OM-269676 Page 9

3-6. Attaching Adapter To Regulator

! Be sure breathing tube is prop-

erly installed or contaminated

air may enter the helmet.

1 Adapter

2 Regulator

3 Blue Collar

Rotate collar to the left. Insert adapter

into regulator until adapter locks into

position. Rotate collar to the right to

lock.

To remove adapter, rotate collar to the

left. Press down on collar and pull

adapter away from regulator.

Attaching Adapter To Regulator

Removing Adapter From Regulator

Rotate blue collar to the left.

Insert adapter into regulator. Rotate blue

collar to the right to lock in adapter.

Rotate blue collar to the left. Push down on collar.

Pull adapter from regulator.

Unlock

C50 AIR REGULATOR ASSEMBLY

OM-269676 Page 10

3-7. Connecting Airline Hose To Regulator

! Be sure airline hose is proper-

ly installed before using the

supplied air respirator.

. See Section 3-2 for air supply

specifications, and Section 3-3

for air pressure specifications

for Miller supplied air hose.

1 Airline Hose Coupling

2 Outer Sleeve

3 Regulator Air Inlet

Slide spring-loaded outer sleeve

back from end of coupling. Insert

regulator air inlet fully into coupling.

Release outer sleeve. Verify airline

connection is secure.

To disconnect airline hose, slide

spring-loaded outer sleeve back

from end of coupling. Pull coupling

away from regulator air inlet. Re-

lease sleeve.

Attaching Airline Hose To Regulator

Removing Airline Hose From Regulator

C50 AIR REGULATOR ASSEMBLY

OM-269676 Page 11

3-8. Adjusting Regulator Airflow

! Wear gloves when using air-

flow adjustment knob. Ad-

justment knob is hot when

regulator is in use.

! Exhaust air from bottom of

regulator is hot. Wear Respi-

rator as instructed in Sec-

tion 3-10 to avoid contact

with hot exhaust air.

1 Airflow Adjustment Knob

Regulator airflow cools the inside of

the welding helmet. Adjust airflow

to achieve desired comfort level.

Rotate knob counterclockwise to

decrease airflow and supply more

cold air to the helmet. Rotate knob

clockwise to increase airflow and

supply warmer air to the helmet.

Tools Needed:

Colder

Warmer

3-9. Checking The Respirator Before Use

! Do not enter a hazardous area until you are

sure the supplied air respirator and air filtra-

tion system are assembled correctly, working

properly, and the respirator is worn properly.

Before using the respirator, check the following items:

1 Breathing Tube

Be sure the tube is undamaged and properly con-

nected to the regulator assembly and hood. Reinstall

cover after inspecting breathing tube.

2 Headseal

Inspect the headseal and replace if damaged. See

roubleshooting

section if air is not being supplied to

hood (Section 3-13).

3 Air Regulator

Be sure the regulator is undamaged and adapter is

properly installed (Section 3-6). Verify airline hose is

securely connected to regulator air inlet (Section 3-7).

4 Airline Hose(s)

. See Section 3-2 for air supply specifications and

Section 3-3 for air pressure specifications for

Miller supplied air hose.

Inspect the hose(s) and replace if damaged. Ensure

quick disconnect fittings are incompatible with fittings

on hoses carrying non-breathable air.

Adjust the incoming air pressure to correct range as

specified in Section 3-3.

C50 AIR REGULATOR ASSEMBLY

OM-269676 Page 12

3-10. Putting On The Respirator

! Leave the contaminated area

immediately if the equipment

is not working properly. Do not

remove the equipment until

you are in a safe area.

. See Parts List in Section 6 for op-

tional belt extension.

Place regulator assembly against

waistline with breathing tube extend-

ing upward. Fasten belt around waist.

Adjust belt so unit rests comfortably

against lower back.

. See Parts List in Section 6 for op-

tional belt extension.

Put on helmet assembly and adjust

headgear to provide a comfortable fit.

Tighten headseal drawstring to es-

tablish a tight seal around head.

Adjust regulator airflow to achieve

desired comfort level inside helmet

(Section 3-8).

Verify incoming air pressure is still

within correct range (see Section

3-3).

C50 AIR REGULATOR ASSEMBLY

OM-269676 Page 13

3-11. Replacing Belt Pad

1 Belt Pad

2 Regulator Clip

3 Belt

4 Adjuster

5 Buckle

Remove belt from adjusters, buckle,

pad and regulator clip.

Thread belt through regulator clip, new

pad, adjusters, and buckle as shown.

Adjust belt to desired length.

. See Parts List in Section 6 for op-

tional belt extension.

1 2

Routing Belt Through Adjusters And Buckle

3-12. Respirator Maintenance

Never use solvents or abrasive cleaning solutions to clean the respirator assembly. Keep water and other fluids out of regulator

assembly.

. Maintain accurate records of respirator maintenance.

For best performance clean the equipment after each use. Use a soft cloth dampened with a mild soap and water solution to wipe all external surfaces

clean. Do not insert anything into the regulator assembly. Allow to air dry.

Inspect breathing tube and replace if damaged or if inside of tube is dirty. Clean breathing tube by flushing with soap and water, followed by a clean

water rinse. Do not use a brush to clean inside of breathing tube.

If the respirator will not be used for an extended period, store in a clean, dry, cool place free of solvent-based vapors.

C50 AIR REGULATOR ASSEMBLY

OM-269676 Page 14

3-13. Respirator Troubleshooting

Trouble Remedy

Air regulator freezes. Install air dryer to remove excessive moisture from air supply.

Air flow is inadequate. Increase air pressure to recommended range (see Section 3-3) .

Airflow does not supply adequate

cooling to helmet.

Clean regulator and remove debris from filter.

Airline is too small. Increase size (diameter) of airline hoses.

Ensure air supply can deliver recommended airflow to operate the air regulator at the recommended

pressures (see Section 3-2).

Ensure air compressor is not overheating.

Insulate airlines or move them away from sources of heat.

Airflow is providing too much cooling to

helmet.

Adjust regulator airflow (see Section 3-8).

Reduce air pressure to recommended range (see Section 3-3).

Excessive airflow to helmet. Reduce air pressure to recommended range (see Section 3-3) .

Air supplied to helmet smells and tastes

unusual, or irritates eyes and throat; op-

erator experience dizziness, impaired

vision, or other unusual symptoms.

Continue wearing the respirator and leave the contaminated area immediately.

Check breathing tube connections at regulator and helmet air inlet (see Section 3-5).

Verify air source is located away from sources of contamination, such as vehicles and building ex-

haust vents. Be sure air source is properly filtered.

Have Safety Director and an Industrial Hygienist determine if you are using the proper equipment

for the work environment.

Notes

Work like a Pro!

Pros weld and cut

safely. Read the

safety rules at

the beginning

of this manual.

WELDING HELMET HEAD ASSEMBLY

OM-269676 Page 15

SECTION 4 − WELDING HELMET HEAD ASSEMBLY

. See Section 3 for information on the C50 air regulator assembly.

4-1. Specifications

Specification T94i Welding Helmet

Viewing Field 3.81 x 2.62 in. (97 x 60mm)

Reaction Time 0.00005 sec (1/20,000)

Available Shades

All Shades Provide

Continuous

UV And IR

Protection.

Weld Mode

Darkened State: No. 8 − No. 13

Light State: No. 3

Cut Mode

Darkened State: No. 5 − No. 8

Light State: No. 3

Grind Mode

Light State: No. 3

X-Mode

Darkened State: No. 8 − No. 13

Light State: No. 3

Sensitivity Control Adjustable For Varying Ambient Light And Welding Arc

Delay Control Slows Lens Dark-To-Light State Between 0.1 And 1.0 Seconds

Automatic Power Off Shuts Lens Off 45 Minutes After Last Arc Is Struck

Low Battery Light Red Led Illuminates To Indicate 2−3 Days Remaining Battery Life

Power Supply Panasonic CR2450 Lithium Battery (Miller Part No. 217043)

Sensors Independent/Redundant (Four)

Operating

emperature

14_F to 131_F / −10_C to +55_C

. When Stored In Extremely Cold Temperatures, Warm Helmet To Ambient Temperature Before Welding.

Storage

emperature

−4_F to 158_F / −20_C to +70_C

. When Stored In Extremely Cold Temperatures, Warm Helmet To Ambient Temperature Before Welding.

Total Weight

(Helmet, Lens, Headgear, Head

Seal)

T94i:

33.1 oz (938 g)

Standards ANSI Z87.1+ and CSA Z94.3

4-2. Helmet Configuration

1 T94i Helmet

The T94i helmet features a flip-up

auto-darkening lens and a separate,

clear grinding shield. Flip the lens up

when grinding and performing other

non-welding work. Flip the lens down

when welding or cutting.

260483-7

WELDING HELMET HEAD ASSEMBLY

OM-269676 Page 16

4-3. Helmet Controls

The lens on T94 Series Helmets

turns on (darkens) automatically

when welding begins and turns off

when welding stops.

1 Mode Button (On/Off)

(See Sections 4-4 and 4-5)

2 Grind Mode / Low Battery

Light (Section 4-4)

3 Adjust Button

4 Increase (+) Button

5 Decrease (-) Button

6 Info Control Button (See

Section 4-10)

. The lens assembly saves the

shade, sensitivity, and delay

settings.

260482-2 / 260482-4

4-4. Mode Button And Grind / Low Battery Light

. The auto-darkening lens on T94

Series Helmets turns on (dark-

ens) automatically when welding

begins and turns off when weld-

ing stops.

1 Mode Button

Press Mode button to check if the

lens is working properly and to begin

Mode and Info adjustments.

When the Mode button is pressed,

the helmet control display will appear.

Do not use the helmet if the lens does

not function as described. (See Sec-

tion 5-1, T

roubleshooting.)

2 Grind / Low Battery Light

The Grind / Low Battery light blinks

when the lens is in the Grind mode.

Light stays on when 2−3 days of bat-

tery life remain.

If battery power is low, replace with

Panasonic CR2450 lithium battery (1

required − Miller Part No. 217043).

See Section 4-16.

260482-4

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Miller 20180812410001 Owner's manual

Brand: Miller

Model: 20180812410001

Category: Welding System

Type: Owner's manual

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