Comments on A.S.A. Z21.13.2 - 1956: Gravity and Forced Air Central Furnaces; and A.S.A. Z21.17 - 1948: Listing Requirements for Domestic Gas Conversion Burners

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Publisher’s version / Version de l'éditeur:

Technical Note (National Research Council of Canada. Division of Building Research), 1957-11-01

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Comments on A.S.A. Z21.13.2 - 1956: Gravity and Forced Air Central Furnaces; and A.S.A. Z21.17 - 1948: Listing Requirements for Domestic Gas Conversion Burners

Kent, A. D.; Hutcheon, N. B.

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DIVISION OF BUILDING RESEARCH

NATIONAL RESEARCH COUNCIL OF CANADA

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No.

236

NOT FOR PUBLICATION

PREPARED BY AoD 0 Kent and CHECKED BY

N.Bo Hutcheon

PREPARED FOR

C.SoAo Committee on Gas Burning Appliance, and Equipment

FOR INTERNAL USE

APPROVED BY NBH

DATE November 1957

SUBJECT

Comments on AoSoAo Z21ol302 -195'6:

Gravity and Forced Air Central Furnaces; and AoSoAo Z2l 017 -

1948:

Listing ｒ･ｱｵｩｾ･ｭ･ｮｴｳ

for Domestic Gas Conversion Burners.

The above AoSoAo specifications have been reviewed as a basis for the preparation of corresponding CSA specifications.

All references to American Standards are listed below6 With

information on existing Canadian Standards where these exist. Reference is made also to items which are potentia'lly in conflict

with existing Canadian codes such as the National ｂｕｩｬ､ｾｮｧ Code_

19530 All specified temperatures are listed as a convenience in

further consideration of these specificationso

A.SoAo Z2lo13.2 - 195'6 standards Page Paragraph 1 1.303 2 10603 ) 6 1012 01 ) 2 10608 ) 8 1018 02 ) American Standard AoSoA. BIoI - 1949 AoSoAo B36010 - 1950 ( ( A.loSolo C1010 Canadian Standard CoSoA. BI.I - 1949 CoSoAo B62 - 1949 CoSoA. B63 -

1949

No CoSoAo Probably use AoI.SoL.

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2

-A.S.A. 221.13.2 - 1956 (contd.)

ｅｬ･｣ｴｲｩｾｾ･ｳｵｾｾｭ･ｮｴＲｷｩｲｩｾｓＲ motors

Page Paragraph

9-13 1.21 and 1.22 Instead of A.S.A. Cl - 1956 use

C.S.A. C22.1 - 1953 (this should be .

checked with Electrical Code Committee)

American Standard Listina and Installation Requirements

Page ParagraPB Code Number Title

3 1.9.2 Z2l.20 - 1951 Automatic pilots

4

1.11.1 _{Z21.15 - 1954} Gas valves

7 1.14.1 Z210 21 - 1952 Automatic valves for

gas appliances

7 1.15.2 Z21.18 - 1955 Domestic gae appliance

pressure regulators

7 1.1601 Z2l.35 - 1945 Gum protective devices

15 1.27.3 _{Z21.)0 - 1954} Gas piping and gas

appliances in buildings

These references will pre5Umably be changed to the corresponding C.S.A. Standards when they are completed.

Miscellaneous

1. Sheet metal gauges

In the above standard sheet metal thickneeses 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 National

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3

-A.S.A. Z21.13.2 - 1956 (contd.)

2. Pipe sizes

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

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

3. Wire screen

Paragraph

No. 40 mesh brass, aluminum or equivalent This is equivalent to 420 microns mesh as specif'ied in 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. Floor :furnace dif'fers 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 2 3 3 6 6 8 . Paragraph 1.6.1 ) 1.8.3 ) 1.ＸＮｾＮ ) 1.12.6

Minimum melting point of materials 14500F

and 11000F

Maximum temperature on aluminum tubing 700°F

Minimum melting point of' materials l4500F

Table 1 Temperature limit control settings

. (N.B.C. ｾ･ｱｵｩｲ･ｳ 250°F regardless of

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..

4

-A.S.A. Z2l.13.2 - 1956 (contd.) 6. Temperatures (contd.) Page 19 28 29 29 35 36 Paragraph

2.1.11 Temperature rise for forced warm air

furnaces 85°F or 115°F

Maximum temperature rise above inlet temperature (various metals)

Temperature rise in filters 175°F and 90°F above room

Maximum air discharge temperature 130°F above inlet air temperature.

Maximum temperature on adjacent combustible material 90°F above room, i.e. 160°F for air at 70°F

Maximum flue gas temperature 480°F above room, i.e. 550°F at draft hood outlet

for air at 70°F .

40 2.20.a Heating ･ｬ･ｭ･ｾｴ temperatures, Table IV

41 2.20.b Maximum temperatures on materials, Table V

41 2.21 Maximum surface temperature 90°F above

room

7. Insulation of test plenum and ducts Paragraph

2.81 "Glass wool is suitable

mineral wools?

It

••• Are not all

8. Floor Mounting

The N.B.C. (item 6.2.3.2.2 Installation (a) Mounting) requires mounting on the ground, or masonry, or non-combustible material

of not less than 2-hour fire resistance. The A.S.A. Standard

Z2l.l3.2 - 1956 (paragraph 2.16, p. 35) requires temperatures at 6 inches and under the unit not to exceed 90°F above room air temperature after one hour's operation.

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..

... 5

-98 Installation in Enclosed Spaces

NoBoCCl (item 6020308(4) requires a minimum of' one square inch

for each, 1000 Btu per hour inputg for all types of furnaceo

ａ｟ｾｓｯａｯ StandardZ21 0130"2 .". 1956 (parawaph 2022ci1, po

42)

is the same except for horizontal furnaces wqere a minimum of 2 square inches per 1000 Btu per hour input is'required o

100 Location of manual shut-off valve

NoBoC o (item 6 020308(5) requires this to be "near the entrance

to the room where tne gas burner is located"0 AoSoAo Standard

ｚＲＱＰＱｾＰＲ - 1956 (paragraph 1Clllo139 po

4)

requires this to be

only readily accessib1e"o

110 Shut-of'f valve for low pressure safety

ｎｯｂｯｃｾ (item 0020308(5) requires furnaces using liquefied

petroleum gases to be equipped with positive shut-off at gas

pressures below 1/2 1b/sqoino AoSoAo has no such requlremento

AoSoAo ｚＲＱｾＱＷ .".

1Q48

standards 3 9 13 Section 5o,b ) 110a ) 17 Amertoan Standard AoSoAo B36010 - 1939 Canadian Standard ( CoSoAo B62 - 1949 ( CoS 010 B63 - 1949 CoSoAci BIo1 - 1949 ｾ 10-12 Section

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" • J

6

-A.S.Ao Z21.17 - 1948 (contd.)

American Standard Listing and Installation Requirements

Page Section Code Number Title

1 1.6 Z2l.8 • 1948 Domestic gas conversion

burners

6 2.a Z21.20 - 1940 Automatic pilots

8 10.b Z2l.l5 - 1944 Gas valves

9 ll.b _{Z2l.24 - 1941} Semi-rigid gas appliance

tubing and fittings

9 l2.b Z2l.l8 - 1934 Domestic gas applianoe

pressure regulators

10 l3.a Z2l.2l - 1935 Automatic main gas control

valves

12 _15.a _{Z'2l.35 - 1945} Gum protective devices

These references will ｰｲ･ｳｾ｡｢ｬｹ be brought up to date

in the revised Z2lol7 and should be changed to the corresponding

e.S.A. Standards when they .are completed.

Miscellaneous

1. Metal Thicknesses

3

Section

Metal thicknesses to be revised to inches to conform with new editions of other

A.S.A. Standards. There is no Canadian

Standard on sheet metal gauges, although at present e.G.S.B. is working on gauging. The National Building Code, 1953 refers to U.S. Standard gauge.

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7

-A.S.A. Z21.17 - 1948 (contd.)

2. Metal temperatures Section

6.8. Maximum metal temperatures to be revised

similar to revision of Z21.13.2 - 1955 to Z21.13.2 - 1956

3. Pipe sizes

Nominal pipe sizes are preBUmab1y in accordance with A.S.A. B36.10 - 1950 (no C.S.A. Standard)

Pipe ｴｾ･｡､ｳ are pregumably in accordance with A.S.A. B2.1 -1945 (no C.S.A. Standard)

4. Test gases

Are Canadian test gases the same?

5. Definitions

Draft hood - differs ｾｲｯｭ N.B.C.

Flue - differs from N.B.C.

Heating value (total) - higher calorific value. Others ｲ･ｾ･ｲ

to lower calorifie value.

6. Temperatures

Page Section

3 5.a ) Minimum melting point ｯｾ metals 1450OF

5 8.b

)

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..

•

8

-Agreement with National Building Code,

1953

There appears to be general agreement between the above two works and the 'National Building Code.

The N.B.C. does not detail metal composition, sheet thicknesses and temperatures as do the American Standards. Allowable air temperatures in the American Standards permit a

high limit control setting

or

250

0

F in some cases which is higher than N.B.C. requirements o

The NoB.C. requirements ror controls for gas firing, item

6.2.3.8.5

may be stricter than in the' American Standard. Note, for example, the last paragraph of this section requiring shut-off upon drop in pressure with liquefied petroleum gases.