Comments on ASA Z21.11 - 1956 Gas Fired Room Heaters

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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 ASA Z21.11 - 1956 Gas Fired Room Heaters

Wachmann, C.; Hutcheon, N. B.

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NATIONAL RESEARCH COUNCIL OF CANADA DIVISION OF BUILDING RESEARCH

No.

'f

EClHIN ][(!AIL

NOT FOR PUBLICATION

226

NOTE

FOR INTERNAL USE

C. Wachmann and

PREPARED BYN.B .Hutcheon CHECKED BY APPROVED BY NBH PREPARED FOR CSA Committee on Gas Burning Appliances andDATE April, 1957

Equipment

SUBJECT Comments on ASA Z21.11 - 1956

Gas-Fired Room Heaters

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 1

4

Paragraph American Standard 1.1.8 A.S.A. B.18.6 - 1947 1.1.9 A.S.A. Bl.l - 1949 1.9.1 A.S.A. ｂＳＶｾｬｏ - 1950

Canadian Standard CSA B29-l95l )cover part

CSA B33.l-l950)of An.Std. C.S.A.

BI.l -

1949

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

5-8 1.13

Electrical equipment, wiring

Instead of A.S.A. Cl - 1956 use C.S.A. C22.1 - 1953 (should be checked with Electrical Code Committea.)

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f

2

-A.S.A. Z2l.l1 - 1956

American Standard Listing Requirements

Page Paragraph Code Number Title

3 1.5.4 Z2l.20 - 1951 Automatic pilots 3 1.6.1 _{Z2l.l5 - 1954} Gas valves

5

1.10.1 Z2l.18 - 1955 Domestic gas appliance pressure regulators 5 1.11.1 _{Z2l.23 - 1940} Gas appliance thermostats 5 1.12.1 Z21.21 - 1952 Automatic valves for gas

appliances 9 1.16.2 Z2l.l2 - 1937 Draft hoods

9 1.17.1 Z2l.35 - 1945 Gum protective devices

These references will presumably be changed to the corresponding CSA Standards when they are completed.

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3

-A.S.A. Z21.ll - 1956 Miscellaneous 1. Sheet metal gauges

In the above standard sheet metal thicknesses are given in inches and U.S. ｳｴ｡ｮ､ｾｲ､ gauge. There is no special Canadian

standard on sheet metal gauges, although at present C.G.S.B. is working on gauging. The 1953 National Building Code ｲ･ｾ･ｲｳ to U.S. standard gauge.

2. Pipe sizes

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

Pipe threads are presumably in accordance with A.S.A. B2.1 - 1945 (no C.S.A. standard).

3. Test gase s

Are Canadian test gases the same? 4. Definitions

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

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

5. Temperatures Page Paragraph

4

1.8.3

4

1.9.4 5 1.10.4 16 2.9.1 ) 17 2.9.2 ) 19 2.9.3 19 2.10

Minimum melting point of materials 10000p

Maximum temperature on aluminum tubing 700°F

Maximum environment temperature for gas pressure regulator ＱＵＰｾ

Maximum temperature on adjacent combustible material 90 and 1200F above room, i.e. 160 and 1900p Maximum flue gas temperature 4800F

above room, i.e. 5500F

Maximum temperatures on handles 40, 60 and 80°F above room, i.e. 110,130 and 1500p

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,

4

-A.S.A. Z2l.ll - 1956

Agreement with 1953 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 2.9.1 and 2.9.2 in the American Standard permit temperatures which may be higher than N.B.C. requirements.

The N.B.C. requirements ror controls ror gas riring, Section 6.2.3.8.5 may be stricter than in the American Standard.

Note, ror example, the last paragraph of this section requiring shut-off upon drop in pressure, with L.P.G.