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Technical Note (National Research Council of Canada. Division of Building Research), 1958-01-01
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Comments on A.S.A. Z21.10.1 - 1956 and Z21.10.1a - 1957, Approval Requirements for Gas Water Heaters; and A.S.A. Z21.10.2 - 1956 and Z21.10.2a - 1957, Approval Requirements for Side-Arm Type Water Heaters
Kent, A. D.; Hutcheon, N. B.
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NRC Publications Record / Notice d'Archives des publications de CNRC: https://nrc-publications.canada.ca/eng/view/object/?id=a9ce46f6-edd3-47b8-acc9-08e730b6bef5 https://publications-cnrc.canada.ca/fra/voir/objet/?id=a9ce46f6-edd3-47b8-acc9-08e730b6bef5
NATIONAL RESEARCH COUNCIL OF CANADA
NOT FOR PUBLICATION
244
No.
FOR INTERNAL USE
APPROVED BY NBH CHECKED BY
DIVISION OF BUILDING RESEARCH
'f
E
C
1HI N ][ CAlL
A.D. Kent and
IJ.B. Hutcheon
PREPARED BY
.-PREPARED FOR O.S.A. Committee on Gas Burning
Appliances and Equipment January 1958
SUBJECT Oomments on A.S.A. Z21010.1 - 1956 and
Z21.10.1a - 1957, Approval Require-ments for Gas Water Heaters; and A.S.Ao
Z21.10.2 - 1956 and Z21.10.2a - 1957, Approval ReqUirements for Side-arm
Type Water Heaters
The above A.S.A. specifications have been reviewed as a basis for the preparation of corresponding CSA specifications. 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 con-flict with existing Canadian codes such as the National Building
Code, 1953. All specified temperatures are listed as a
con-venience in further consideration of these specifications. A.S.A. Z21.10.1 - 1956 and Z21.10.1a - 1957
Standards A.S.A. B36.10 - 1950 (CoS.A. B62 - 1949 (C.S.A. B63 - 1949 Page 2 2 2 2 1 (Addenda) 5 5 Paragraph 1.2.13 1.2.14 1.2.15 1.3 1.6.3g 1.9.1 1.9.2 American Standard A.S.A. Bl.l - 1949 A.S.A. B18.6 - 1947) A.S.A. B18.2 - 1952) AoI.S.I. CI010) A.I.S.I. 416 ) A.S.A. B2.1 - ｾＹＴＵ Canadian Standard CoSoAo Bl.l - 1949 C.S.A. B33.1 - 1950 No C.S.A. Probably use A.I.S.lo
·
. 2 .
-American Standard Listing and Installation Requirements
Page Paragraph 4 1.6.4 } 16 2.11.1} 4 1.7.1} 14 2.6 ) 6 1.11 } 18 2.12.1) 6 1.12.1} 20 2.14 ) 2 (Addenda) 1.13} 20 2.15} 2 (Addenda) 1.15.1} 14 2.7 ) 14 2.8 ) 16 2.10 ) Code Number Z21.20 - 1951 Z21.15 - 1954 Z21.23 - 1940 Z21.18 - 1955 Z21.21 - 1952 Z21.22 - 1935 Title Automatic pilots Gas valves
Gas appliance thermostats Domestic gas appliance
pressure regulators Automatic valves for
gas appliances
Relief and automatic gas shut-off valves for use on water heating system 7 7 1.17.3 1.18 Z21.12 - 1937 Z21.35 - 1945 Draft hood$
Gum protective devices These references will presumably be changed to the
corresponding C.S.A. Standards when they are completed. Miscellaneous
1. Sheet metal gauges
In the above standard sheet metal thicknesses are given
in gauges. There is no Canadian Standard on sheet metal gauges,
although at present C.G.S.B. is working on gauging. The National
Building Code, 1953 refers to U.S. Standard gauge.
2. Wire screen
Paragraph
2 (Addenda) 1.14.3 No. 40 mesh brass, aluminum or equivalent
This is equivalent to 420 microns mesh as specified in C.G.S.B. 8-GP-la.
.
,..3
-3. Test gases
Are Canadian test gases the same?
4. 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.
5. Temperatures Page Paragraph 4 5 5 2 (Addenda) 1.6.3a 1.9.5) 1.9.7) 1.14.2
Minimum melting point of materials
14500F and 10000F
Maximum temperature on aluminum tubing 700°F
Minimum melting point of materials 14500 F 9 1.19.10 14 ＲｾＸＮＲＩ 15 2.8.3) 15 2.8.4 8 (Addenda) 2.9.4 18 ＲｾＱＳＮＱＩ 19 2.13.2) 26 2.2l-.1) 27 2.21.2) 27 2.21.3) 9 (Addenda) 2.21.4) 28 2.22 28 2.23.1
Maximum outlet water temperatures 160°F and 180°F
Maximum storage water temperature 212°F
Closing temperature of relief valve in excess of 110°F at 30 p.s.i. Maximum temperature of water in top
6" of tank 210°F with manual reset temperature of 120°F or above. Stora§e heater temperature limits
160 F, 190°F and 200°F
Maximum temperature on adjacent
combustible material 90°F above room, i.e. 160°F for air at 70°F
Maximum average flue gas temperature at flue collar 550°F
Maximum temperature of manually
operated parts 60°F and 80°F above room temperature
Page 28 33 Paragraph 2.23.2 2.29
4
-Maximum temperature of surfaces 30°F and 60°F above room temperature Minimum melting temperature lOOOoF
6. Location of manual shut-off valve
N.B.C. (item 6.2.3.8.5) requires this to be "near the
entrance to the room where the gas burner is located". A.S.A.
Standard Z21.10.1 - 1956 (paragraph 1.7.5, p.5) requires this to be only "readily accessible".
ａＮｓｾａＮ Z21.10.2 - 1956 and Z21.10.2a - 1957 Standards
Page Paragraph American Standard Canadian Standard
2 1.2.11 A.S.A. Bl.l - 1949 C.S.A. Bl.l - 1949
2 1.2.12 A.S.A. B18.6 - 1947) C.S.A. B33.1 - 1950
2 1.2.13 A.S.A. B18.2 - 1952)
2 1.3 A.I.S.I. CIOIO) No C.S.A. Probably
1 (Addenda) 1.6.3g A.I.S.I. 416 ) use A.I.S.I.
5 1.9.1 A.S.A. B2.1 - 1945 No C.S.A. Use A.S.A.
5 1.9.2 A.S.A. B36.10 - 1950 (C.S.A. B62 - 1949
(C.S.A. B63 - 1949 American Standard Listing and Installation Requirements
Page Paragraph Code Number Title
4 1.6.4a) Z21.20 - 1951 Automatic pilots
11 2.7.1 )
4 1.7.1)
Z21.15 - 1954 Gas valves
11 2.6 )
5 1.10) Z21.23 - 1940 Gi=ls appliance thermostats
13 2.8.1)
6 1.11.1)
Z21.18 - 1955 Domestic gas appliance
5
-Page Paragraph Code Number Title
6 1.12.1) Z21.21 - 1952 Automatic valves for
14 2.10 ) gas appliances
6 1..15.2 Z21.12 - 1937 Draft hoods
6 1.16 Z21.35 - 1945 Gum protective devices
These references will presumably be changed to the corresponding C.S.A. Standards when they are completed.
Miscellaneous
1. Sheet metal gauges
In the above standard sheet metal thicknesses are given
in gauges. There is no Canadian Standard on sheet metal gauges,
although at present C.G.S.B. is working on gauging. The National
Building Code, 1953 refers to U.S. Standard gauge.
2. Wire Screen
Page
1 (Addenda)
Paragraph
No. 40 mesh brass, aluminum or
equiva-lent. This is equivalent to 420
microns mesh as specified in C.G.S.B. 8-GP-la.
3. Test gases
Are Canadian test gases the same?
4 • 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.
5. Temperatures Page Paragraph 3 5 5 5 1.6.3a) 1.9.12) 1.9.5) 1.9.7)
Minimum melting point of metals 14500F
and 1000oF.
Maximum temperature on aluminum tubing 700°F.
6 -Page Paragraph 1 (Addenda) 1.13.2 3 (Addenda) 2.14.1) 18 2.14.2) 18 2,,15 18 2.16
Minimum melting point of metals 14500F
Maximum temperature on adjacent com-bustible material 90°F above room, i.e. 160°F for air at 70°F
Maximum average temperature of flue gas 550°F
Maximum temperature of manually operated parts 60°F and 80°F above room tempera-ture
21 2.19 Minimum melting temperature lOOOoF
A.S.A. Z21.10.1 - 1956 and Z21.10.1a - 1957 A.S.A. Z21.10.2 - 1956 and Z21.10.2a - 1957 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.
The N.B.C. requirements for 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.
