AIRCHIME AIRHORNS

INTRODUCTION

Industrial air horns should be located in the approximate centre of the area to be covered. You should mount the horn high, well clear of other buildings or high objects that would deaden or deflect the sound. If on a building, install near the corner or end on a suitable frame, clearing roof top by at least six feet. Point the horn to the area that is most important for the sound to be heard. Large area plants that have a number of buildings with a high inside noise level, may require additional horns. These should be located inside the buildings and tied into the main horn circuit so that all horns blow simultaneously.

INSTALLATION

All Model K and KM horns have fixed diaphragm caps that require no adjustment. The Model C has an adjustable diaphragm cap for initial tensioning. All models will emit a clear sharp note without distortion, operating at any pressure from 50 to 150 p.s.i. However, the loudness will vary in relation to the pressure. Therefore the operating pressure should be from 100 to 150 p.s.i. for maximum loudness and efficiency.

When operating at pressures below 50 p.s.i., horns can be supplied with larger inlet orifices to maintain loudness at lower pressure. Therefore make sure that the stated working pressure of the horn is in accordance with the pressure of the air system.

• Air supply line should be one size larger than the inlet connection of the horn.
• Air supply line should rise continuously through well graded piping, free from pockets and long horizontal runs.

• 3. Air supply at the horn should be clean and dry. Install separators, traps and strainers to maintain this.
• Air supply should be taken from top of air tank or main supply line.
• 5. Use thread seal sparingly and on male threads only.
• 6. Avoid the use of elbows if possible. Long radius bends are less restrictive.
• On extreme long runs, a buffer tank, located close to the horn, will compensate excessive pressure drop.
• 8. Install shut off valves where necessary to facilitate servicing.
• 9. Install operating valve close to horn for sharp concise blasts - Sound should not "trail off" at the completion of a signal.
• 10. Before connecting horn and valve, blow out all lines thoroughly, tapping pipe with hammer to free loose scale and pipe chips.
• 11. Pressure drop at the horn should not exceed 15 p.s.i., when blowing. Install test gauge at the horn inlet to check this when installing.
• 12. Outside runs that are exposed to cold weather conditions should be well protected or consideration given to electric heating of the pipe.

If the above procedure has been followed, the horn will sound loud and clear when the manual valve is pulled or the solenoid energized.

These instructions are general and cannot possibly meet every contingency with regard to installation, operation or maintenance. If further information is required or to deal with specific problems, please consult Edwards.

MAINTENANCE - MODEL K AND KM

Diaphragm head components and their order of assembly is shown in figure 1 and 2. This is typical for all model K and KM Horns.

• To dismantle, remove cap screws (1) and insert pin or wire in hole (E) to remove diaphragms and cushion ring (3 and 4).
• Clean thoroughly and inspect discs (3) for unusual wear, cracks, or scuff marks.
• 3. Inspect cushion ring (4); it should measure .145 in thickness and not show signs of flattening or hardening.

4. Wipe off and inspect seats (C and D). Remove any particles that are lodged or embedded. This should be done carefully without destroying the flatness or smooth surface of the seat faces. (If air system is not clean, seats can become badly scuffed or nicked and should be returned to factory for adjustments.)

• 5. Make certain that relief holes (E) are clear and unrestricted.
• 6. Replace any damaged or worn parts with factory replacements (both the diaphragm disc (3) and cushion ring (4) are made of special mill ordered materials. General materials will not give the same results or service).
• 7. Wipe seat faces (C and D) clean.

FIGURE 2

• 8. Wipe and install new parts in order shown. They should turn freely in head (5).
• 9. Do not squeeze the discs together when placing in head or cap.
• 10. Faces (A and B) must be clean before replacing cap (2).
• 11. Make certain that the "O" ring (7) is in position before replacing cap (2).
• 12. Alternately tighten opposite cap screws (1) a little at a time to bring cap evenly and snug to head.

MAINTENANCE - MODEL C

Diaphragm head components and their assembly is shown in figure 3. This is typical for all model C horns.

• To dismantle, loosen lock nuts (3) and machine screws (4). Remove adjusting ring (2).
• Clean thoroughly and inspect diaphragm (1) for unusual wear, cracks, or scuff marks.
• 3. Wipe off and inspect body (5). Remove any particles that are lodged or embedded. This should be done carefully without destroying the inside surface of the body (5). (If air system is not clean, the body should be returned to the factory for adjustments.)

• 4. Replace any damaged or worn parts with factory replacements. The diaphragm (1) is made of special mill ordered materials. (General materials will not give the same results or service.)
• 5. Wipe and install new parts.
• Make certain that the diaphragm (1) is in position before replacing adjusting ring (2).

7. Tension the adjusting ring (2) for maximum loudness and efficiency. Tighten machine screws (4) and lock nuts (3).

MULTI-TONE HORNS

All diaphragm heads are common on multi-tone models and are serviced as indicated in the maintenance section.

Protect ears with cotton or other means when testing.

With horn sounding, place hand in front of each horn mouth to determine if all horns blowing.

For test purposes, all horns should be sounding at 15 to 20 p.s.i. and increase in loudness as the air is increased to maximum operating pressure.

TROUBLESHOOTING

HORN STOPS BLOWING. Air not getting at horn - Wiring open/no voltage at solenoid - Solenoid coil defective or voltage not correct.

HORN RASPY AND DISTORTED. Cracked diaphragm - Chips lodged on diaphragm seat - Loose cap.

HORN HISSES WHEN BLOWN. Diaphragm warped and not seating properly - Excessive pressure - Diaphragm seat badly scuffed.

CHANGE IN CHARACTER OF SOUND. Cracked diaphragm - Warped diaphragm - all horns not blowing (Multi-tone models).

HORN FAILS TO SHUT OFF. Manual valve stuck - Chip lodged in solenoid plunger tube - Solenoid valve frozen - Short circuit in electrical supply.

Make repairs to horn as outlined under maintenance.

EDWARDS

EDWARDS SALES OFFICES AND MANUFACTURER'S REPRESENTATIVES

1 HI	Luce Associates of Hawaii 91-315 Apu'u Way Ewa Beach. HI 96706 (808) 681-3334 FAX #(808) 681-5525
	FAX #(808) 081-5525

2 Shaffer & Nelson, Inc 14522 N. E. 190th St Sulte 205A Woodinville, WA 98072 (206) 487-9715 FAX #(206) 487-9715

2A Shaffer & Nelson, Inc 1018 Morain St Kennewick, WA 99337 (509) 783-0692 FAX #(509) 783-0735

2B Shatfer & Nelson, Inc. 9514 East 1st Ave. Spokane, WA 99206 (509) 924-5212 FAX #(509) 928-6656

2C Shafter 8 Nelson, Inc. 6956 S W. Hampton St Tigard, OR 97223 (503) 624-8293 FAX #(503) 624-8283

2D Shaffer & Nelson, Inc. 18214 Driftwood Bay Eagle River, AK 99577 (907) 694-6592 FAX #(907) 694-6593

3 Edwards, San Francisco CA 5653 Stoneridge Dr Sulte 116 Pleasanton, CA 94588 (510) 463-1788 FAX #(510) 463-1006

4 Edwards, Burbank 611 South Main St. Burbank, CA 91506 (818) 845-7852 FAX #(818) 846-1402

UT MESA Intermountain. Inc 3576 South 500 West Salt Lake City, UT 84115 (801) 266-4040 FAX #(801) 266-4122

6 Intelligent Control Devices CO 2005 W 120th Avenue Denver, CO 80234 (303) 460-9699 FAX #(303) 460-9799

7 Watkins & Ware Co., Inc. 4225 E. McDowell Rd Phoenix. AZ 85008 (602) 244-9815 FAX N(602) 220-0430

Resource Lighting North 5647 Jefferson NE Albuquerque, NM 87109 (505) 344-2944 FAX #(505) 344-4425

UESCO, Inc. 2901 Louisiana Ave N. Minneapolis, MN 55427 (512) 542-8242 FAX #(612) 542-9309

10 Electrical Products Co. P. O. 80x 371089 12799 O St Omaha, NE 68137 (402) 895-2001 FAX #(402) 895-5808

11 Mid-States Electrical Sales & Sarvice Co. Sales & Sarvice Co. 300 W. 23rd Ave MO P. O. Box 34643 W.MS (816) 283-3399 FAX #(816) 283-3991

12 Edwards, Dallas 9550 Skillman Rd Suite 108 Dallas, TX 75243 (214) 348-4148 FAX #(214) 348-1407

13 Edwards, Houston 5401 Mitchelidale Suite 3A Houston, TX 77092 (713) 688-3175 FAX # (713) 688-2633

14 United Sales Associates. Inc 159 Plantation Road Harahan, LA 70123 (504) 733-8711 FAX #(504) 733-8208

15 Associated Products Co. 147 Neil St. Memphis, TN 38112 P. O. Box 12429 Memphis, TN 38182 (901) 324-3725 FAX #(901) 323-3919

15A Associated Products Co 5111 JFK Blvd Suite 2 N. Little Rock, AR 72116 (501) 758-3089 FAX #(501) 758-4724

16 Cooper Electrical Sales, Inc. 9925 Green Park Rd St. Louis, MO 63123 S.IL (314) 843-8605 FAX #(314) 843-8655

17 Edwards, Chicago 18W100 22nd St., Suite 102A Oakbrook Terrace, IL 60181 N.IN (708) 620-1200 FAX #(708) 520-1203

S. ILLINOIS (See 16)

18 West 135 N WI B011 Eagle Court Menomonee Falls, WI 53051 (414) 251-9005 FAX #(414) 251-9072 1 (800) 962-9666

19 Edwards, Detroit 11920 Farmington Rd. Suite A Livonia, MI 48150 (313) 458-7777 FAX #(313) 458-4911

20 Phillips Sales, Inc. 10901 Reed Hartman Hwy Suite 111 Cincinnali. OH 45242 (513) 791-3926 FAX #(513) 791-8701

20A Phillips Sales, Inc. 185 N. Maxwell Court Zionsville. IN 46077 (317) 722-6022 FAX #(317) 873-2630

20B KY 2400 Mellwood Ave. #1014 Louisville. KY 40206 (502) 895-7174 FAX #(502) 897-3132

21 R. B. Paul Co. 540 Wharton Circle S. W Atlanta, GA 30336 GA (404) 696-7100 FAX #(404) 691-4926

FL FLORIDA (Panhandie) Pensacola-Panama City See Allanta, GA

TN TENNESSEE. Nashville Chattanooga, Knoxville See Allanta. GA

22 S.A.1., Inc. (St. Petersburg) 2595 24th Ave.. North St. Petersburg, Ft. 33713 (813) 323-4360 St. Petersburg (813) 223-4566 Tamps

23 Electrical Markoting Services P. O. Box 532036 1517 E Hillcrest St Orlando, FL 32803 (407) 897-7000 Orlando FAX #(407) 897-7011 Orlando WATS (800) 824-0079 FL FAX (WATS) #(800) 445-6918

23A FLORIDA, Miami See Orlando, FL above

23B FLORIDA, Jacksonville See Orlando, FL above

24 Electri-Products Group, Inc. P. O. Box 18009 VA 119 S. Walnut Circle NC Greensboro, NC 27419 SC (910) 294-6230 FAX #(910) B52-1883

25 Edwards, Wash. D.C. Avenues of Commerce 2428 Route 38 Suite 101 MD Cherry Hill, NJ 08002 (609) 462-5300 FAX #(609) 482-1452

Paolicelli & Associates (Pittsburgh) P. O. Box 665 Gregg & Hammond Streets Carnegle industrial Park Carnegle, PA 15106-0565 (412) 276-8816 FAX #(412) 276-6670

28 WEST VIRGINIA WV See Piltsburgh, PA above

29 Edwards, Phila. NJ Suite 101 PA 2428 Route 38 Cherry Hill, NJ 08002 (609) 482-5300 FAX #(609) 482-1452

30 VP Sales Co. 25700 First St Westlake. OH 44145 (216) 871-7530 1 (800) 637-9038 FAX #(216) 871-8494

31 W.E. Daw, Bulfalo 1271 Harlem Rd. Bulfalo, NY 14206 (716) 895-9275 FAX #(716) 895-3210

31A W.E Daw, Albany P.O. Box 138 E. Greenbush, NY 12061 (518) 462-4957 FAX #(518) 462-6729

31B W.E. Daw, Syracuse P. O. Box 6170 Teall SIn Syracuse, NY 13217 (315) 463-8541 FAX #(315) 463-0368

31C NY E. Daw, Rochester 1190 Brooks Ave. Rochester, NY 14624 (716) 328-7350 FAX #(716) 328-3492

32 Edwards, Boston 70 E Shawmul Rd Canlon, MA 02021 NH, ME, RI (617) 821-2550 FAX #(617) 821-2577

33 Edwards, Norwalk Malheis Court NORMALK, CT 06851 WCY, CT (203) 847-1115 FAX #(203) 846-8602

EDWARDS COMPANY SIGNALING PRODUCTS DIVISION Box 1188—195 Farmington Ave Farmington, CT 06032 (203) 678-0410 FAX#(203) 678-0472

New Address Effective January 1, 1996: 90 Fieldstone Court Cheshire CT 06410-1212