Dwyer 172 User Manual
Dwyer Air equipment
Bulletin G-29
Series 170, 171 & 172 Inclined Draft Gages
Operating Instructions and Parts List
1. Gage body
2. Molded nylon rapid shut-off connector, Cat.No. A-315
3. Zero adjust screw
4. Gage stand with screw and washer
5. Scale
6. Leveling screw
7. Magneclip assembly, Cat. No. A-344
9. Spring type holder for terminal tube or thermometer, Cat. No. A-357
10. Rubber tubing, 9 ft. length, Cat. No. A-201
11. Red gage fluid, 1 oz bottle, Cat. No. A-101
TO OPERATE
1. Place gage on a horizontal surface with the gage stand
perpendicular to the body or attach to a vertical steel surface using
Magneclips.
2. Open both Nylon connectors by turning the elbows 1/2 to 3/4 turns
counterclockwise. This will vent the gage.
3. Level the gage by centering the bubble in the level vial. Use the
leveling screw on horizontal surfaces or shift the gage on vertical
surfaces when using Magneclips.
4. Turn the zero adjust screw to set the leading edge of the meniscus
on zero. Align the meniscus with its reflected image to eliminate
parallax error, as shown below.
5. If unable to adjust to zero using the zero adjust screw, add or
remove gage fluid as required. Either of the Nylon rapid shut-off
connectors must be removed to do this.
6. For draft reading, first connect one end of the rubber tubing to the
terminal tube and the other to the right hand gage connector Insert
the terminal tube either over the fire in the combustion chamber or in
the smoke pipe (stack) between the furnace and the draft control.
When reading positive pressures attach tubing to the left connector.
7. Allow a few seconds for fluid to drain and read amount of draft
directly. Adjust controls as needed.
CAUTION:
Use only Dwyer
®
.826 sp. gr. red gage fluid. Clean only with mild soap
and water. Other fluids, solvents or cleaning agents may damage the
gage.
Copyright 2013 by Dwyer Instruments Inc. Printed in U.S.A. 5/13
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Phone: 219/879-8000
Fax: 219/872-9057
www.dwyer-inst.com
e-mail: [email protected]
DWYER INSTRUMENTS, INC.
P.O. BOX 373
MICHIGAN CITY, IN 46360,U.S.A