Comments on ASA Z21.13.4 - 1955 Gravity and Fan Type Vented Recessed Heaters

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

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Comments on ASA Z21.13.4 - 1955 Gravity and Fan Type Vented Recessed Heaters

Wachmann, C.; Hutcheon, N. B.

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DIVISION OF BUILDING RESEARCH

NATIONAL RESEARCH COUNCIL OF CANADA

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No.

225

NOT FOR PUBLICATION FOR INTERNAL USE PREPARED BY C. Wachmann and

N.B.Hutcheon CHECKED BY APPROVED BY NBH

SUBJECT _{Comments on ASA Z2l.l3.4 - 1955}

Gravity and Fan Type Vented Recessed Heaters

April, 1957

CSA ｃｯｾｴｴ･･ on Gas Burning Appliances and

Equipment

PREPARED FOR

The above ASA specirication has been reviewed as a basis

ｾｯｲ the preparation ｯｾ a corresponding CSA ｳｰ･｣ｩｾｩ｣｡ｴｩｯｮＮ 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

ｳｰ･｣ｩｾｩ･､ temperatures are listed as a convenience in fUrther consideration or this specirication.

Standards Page 1 2 2 Paragraph 1.2.3 1.5.3 1.5.8 American Standard A.S.A. Bl.l - 1949 A.S.A. B36.l0 - 1950 A.I.S.I. ClOlO 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

11-15 1.24

&

2

-A.S.A. Z21.13.4 - 1955

American Standard Listing Requirements

Page Paragraph Code Number Title

4

4 1.10.1 Z21.15 - 1954 Gas Valves

5 1.11.6 Z21.24 - 1941 Semi-Rigid gas appliance

tUbing and fittings

6 1.13. 1 Z21.21 - 1952 Automatic valves for

gas appliances

6 1.14.2 Z21.18 - 1934 Domestic gas appliance

pressure regulators

6 1.15.1 Z21.35 - 1945 Gum protective devices

7

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

3

-A.S.A. Z21.l3.4 - 1955 Miscellaneous

1. Sheet metal gauges.

In the above standard sheet metal thicknesses are given in U.S. standard gauge; in the addenda they 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 si zes

Nominal pipe sizes are presumably in accordance with A.S.A. B36.l0 - 1950 (no C.S.A. standard)

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

3. Wire screen

Page Paragraph

6 No.40 mesh brass

This is equivalent to 420 micron mesh as specified in C.G.S.B. 8-GP-la (on the basis of free area).

4.

Ai'e 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 specified whereas others refer to lower calorific value 6. Temperatures

Page Paragraph

3 1.703 )

3 1.7.4 )

5 1.11.7

Minimum melting point of materials 1450 and 11000p

Maximwn temperature on aluminum tubing 700'"'F

,. _•

Temperatures (continued)

4

-Page Paragraph

6 1.12.2 Minimum me.l ting point of materials l4500_F

6 _1.13.4 Minimum melting point of materials

ＸＰＰｾ v

20 201.7 Throughput air temperature rise on test 80 and l300F', l .. e .. 150 and ＲＰＰｾ for air in at 700F 25 25 27 27 32 32 32 33 36 36 2.10.1 ) 2.10.2 ) 2.11.1 2.16 2.17.2 2018 2 .. 22.a 2 .. 22.b

Temperature rise in filters ＹＰｾ above room, 1.e. 1600_{F for air at 70}0_F

Maximum temperature at air discharge 2900F above room, i.e. ＳＶＰｾ for air at ＷＰｾ

Settiag of temperature limit. controls 250 F

Maximum temperature on adjacent

combustible material 900_{F above room,}

i.e. ｬＶＰｾ

Maximum flue gas temperature 3800_F

. above room, i.e. ＴＵＰｾ

Maximum flue g·s temperature with restricted flue 480°F above room, i .. e .. ＵＵＰｾ

Maximum temperature of handled parts 60 and 800F above room, i.e. 130 and 1500F Heating element temperatures, Table III Maximum temperature on materials,

; '

5

-A.S.A.

221.13.4 -

1955

Agreement with

1923

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 Americ&n Standard.

Paragraph 2.11.1 in the American Standard permits a temperature which may be higher than the N.B.C. requirements.

The N.B.C. requirements for controls for gas riring, Section

6.2.3.8.5

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