Comments on A.S.A. Z21.13.3 - 1956 Gravity and Fan Type Floor Furnaces

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Publisher’s version / Version de l'éditeur:

Technical Note (National Research Council of Canada. Division of Building Research), 1957-04-01

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Comments on A.S.A. Z21.13.3 - 1956 Gravity and Fan Type Floor Furnaces

Wachmann, C.; Hutcheon, N. B.

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DIVISION OF BUILDING RESEARCH

NATIONAL RESEARCH COUNCIL OF CANADA

PREPARED BY

FOR INTERNAL USE

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1HIN 1I CAlL

NOT FOR PUBLICATION

c.

Wachmann and N.B.Hutcheon CHECKED BY

NOTE

APPROVED BY

No.

227 NBH

PREPARED FOR CSA Committee on Gas Burning Appliances and DATE April, 1957

Equipment

SUBJECT Comments on A.S.A. 221.13.3 -1956 Gravity and Fan Type Floor Furnaces

The above ASA specification has been reviewed as a basis

for the preparation of a corresponding CSA specification. All

references to American Standards are listed below, with information

on existing Canadian standards where these exist. Reference is

made also to items which are potentially in conflict with existing

Canadian Codes such as the National Building Code, 1953. All

specified temperatures are listed as a convenience in further consideration of this specification.

Standards 1 2 2 Par8:graph 1.2.3 1.5.3 1.5.8 American Standard A.S.A. Bl.l - 1949 A.S.A. B36.10 - 1950 A.I.S.I C1010 Canadian Standard C.S.A. Bl.l - 1949

No C.S.A. Use A.S.A.

No C.S.A. Probably

use A.I.S.I. Electrical equipment, wiring, motors

8-13 Instead of A.S.A. Cl - 1956 use

C.S.A. C22.1 - 1953 (should be checked with Electrical Code Committee)

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2

-A.S.A.

Z21.13.3 - 1956

American Standard Listing Requirements

Page Paragraph Code Number Title

4

1.9.2 Z21.20 - 1951

Automatic Pilots

4

1.10.2 _{Z21.15 - 1954}

Gas valves

6

1.13.1 Z21.21 - 1952

Automatic valves for gas appliances

6

1.14.2 Z21.18 - 1955

Domestic gas appliance pressure regulators

6

1.15.1 _{Z21.35 - 1945}

Gum protective devices

the These references will pre

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3

-A.SeA. Z21 0l303 - 1956 Miscellaneous

1. Sheet metal gauges

In the above standard sheet metal thicknesses are given in inches. There is no Canadian standard on sheet metal gauges, although at present C.G.S.B. is working on gauging. The 1953 National Building Code refers to U.S. standard gauge.

2. Pipe sizes

Nominal pipe sizes are presumably in accordance with A.S.A. B36.10 ｾ 1950 (no C.S.A. standard)

Pipe threads are presumably in accordance with ａＮｓＮｾ B201 - 1945 (no C.S.A. standard)

3. Wire screen

Page Paragraph

6

NOa40 mesh brass, aluminum or equivalent

This is equivalent to 420 microns mesh as specified in C.G.S.B. 8-GP-la.

4. Test gases

Are Canadian test gases the same?

5.

Definitions

Draft hood - differs from N.B.C. Flue - differs from N.B.C.

Heating Value (total) - higher calorific value. Others refer to lower calorific value.

6.

Temperatures Page Paragraph

3

5

10703 ) 10704 ) 1011.7

Minimum melting point of materials 14500p and 1100UP

Maximum temperature on almninum tubing 700°F

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..

... 4

-6. Temperatures (continued) Page Paragraph 6 23

24

29 31

34

35

2012.1 ) 2.12.2 ) 2.13.1 2.19 2022.a

Minimum melting point of materials

1450

0_F

Temperature limit at register

3500F

above room, i.e. 4200F for air at

700F

Temperature rise in filters ＹＰｾ above

room, i.e. 1600F for air at 700p

Maximum air discharge temperature at

register

350

0_p _{above room, i.e. 4200p}

for air a t ＷＰｾ

Temperature limit controls set at

350°F

aoove room, i.e. 4200p for air at

700p

Maximum temperature on adjacent combustible

material 900Ft above room, i.e. 1600_p _for

air at

700p

Maximum flue gas temperatures 5300p above

room, i.e. 600Op, at draft hood inlet,

4800p above room, i.e.

5500p

at draft Dod

outlet, for air at 700p

Heating element temperatures, Table III Maximum temperatures on materials,

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ｾ

.

•

,

A.S.A. 221.13. 3 ｾ 1956

Agreement with 19,53 National Building Code

There appears to be general agreement between the above two works.

The N.B.C. does not detail metal composition, sheet thicknesses and temperatures as does the American Standard.

Paragraphs 2.13.1 and 2.13.2 in the ｐｾ･ｲｩ｣｡ｮ Standard permit a

temperature which may be higher than N.B.C. requirements.

The N.B.C. requirements for controls for gas firing, Section 6.2.3.8.5 may be stricter than in the American Standard. Note, for exmnp1e, the last paragraph of this section requiring