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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. Z21.16 - 1957: Approval Requirements for Gas Unit Heaters; A.S.A. Z21.9 - 1948 and Z21.9a - 1949: Approval
Requirements for Hot Plates and Laundry Stoves
Kent, A. D.; Hutcheon, N. B.
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'f
EClHIN ][CAlL
NOT FOR PUBLICATION FOR INTERNAL USE
DATE January 1958 PREPARED FOR
APPROVED BY PREPARED BY A.D. Kent and CHECKED BY
N.B. Hutcheon
C.S.A. Committee on Gas Burning Appliances and Equipment
SUBJECT Comments on A.S.A. Z21.16 - 1957:
Approval Requirements for Gas Unit Heaters;
ａＮｓＮａｾ Z21.9 - 1948.and Z21.9a - 1949: Approval Requirements for Hot Plates
and Laundry stoves
NEH
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 conflict with existing Canadian codes such as the National Building Code, 1953. All specified temperatures are listed as a convenience in further consideration of these specifications.
A.S.A. Z21.16 - 1957 Standards
Page Paragraph American Standard Canadian Standard 2 1.3.8 A.S.A. Bl.l - 1949 C.S.A. Bl.l - 1949 2 1.4.2 A.I.S.I. CIOIO )
No C.S.A. Probably
3 1.8.4b A.I.S.I. 416 ) use A.I.S.I.
4 1.10.1 A.S.A. B36.10 - 1950 (C.S.A. B62 - 1949 (C.S.A. B63 - 1949 Electrical egUipment, wiring, motors
Page Paragraph
7 - 11 1.18 Instead of A.S.A. 01 - 1956 use C.S.A. C22.1 - 1953 (this should be checked with Electrical Code Committee)
-
2-American Standard Listing and Installation Requirements Page Paragraph Code Number Title
I
4 1.805a )
Z21.20 - 1951 Automatic pilots 20 2.13.1 )
4 1.9.1 Z21.15 - 1954 Gas valves
5 1.11.1) Z21.21 - 1952 Automatic valves for
22 2.15 ) gas appliances
6 1.13.2)
20 2.12 ) Z21.18 - 1956 Domestic gas appliance
34 4.12 ) pressure regulators
7 1.17.1 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 inches. There is no Canadian Standard on sheet metal gauges, although at present C.G.S.B. is working on ganging. The National Building Code, 1953 refers to U.S. Standard gauge.
2. Pipe sizes
Nominal pipe sizes are presumably in accordance with A.S.A. B36.10 - 1950 (C.S.A. B62 - 1949 and B63 - 1949)
Pipe threads are presumably in accordance with A.S.A. B2.1 - 1945 (no C.S.A. Standard)
3. Wire screen Page Faragraph
6 1012.3 No. 40 mesh brass, aluminum or eqUivalent This is equivalent to 420 microns mesh as specified in C.G.SoB. ＸＭｮｐｾｬ｡Ｎ
4. Test gases
50 Definitions
Draft hood - differs from NoBoCo Flue - ､ｩｦｾ･ｲＵ from NoBoCo
Heating value (total) - higher oa1orific value. Others refer to lower oa1orific value. 60 Temperatures Page Paragraph 2 10501 ) 3 10702 ) 6 101202} 5 1,,1004 5 101005 5 1010.7 6 1014 17 20S 18 209 18 201001 18 2010 02 19 201003 19 2011 22 2016) 27 2020) 23 2017
Minimum melting point of materials 14500F and 11000F
Maximum temperature on aluminum ｾｵ｢ｩｮｧ 700°F Maximum temperature on copper tubing 350°F Minimum melting point of materials 10000F Temperature limit oontrol setting 250°F Maximum temperature rise above inlet
temperature (various metals)
Maximum temperature rise above room tempera-ture (various metals)
Maximum heating element temperature 85SoF above inlet air temperature
Parts of heating element in oontaot with flue gasest 17SoF.
Maximum heating element temperatures, (Table) Maximum air discharge temperature 250°F.
Maximum temperature on adjacent oombustible material 90°F above room, (i.e. 1600F for air at ＷＰｯｆｾ
Maximum flue gas temperature 480°F above inlet air temperature (i.e. 550°F at draft hood outlet for air at 70°F)
4
-7. Location of manual shut-off valve.
NoBoC. (item 602.30805) requires this to be "near the entrance to the room where the gas bu:rner is located". A.S.A. Standard Z21.16 - 1957 (paragraph 1.9.4, p.4) reqUires this to be ｾ｡ｳｩｬｹ accessible"o
80 Shut-off valve for low pressure safety
N.B.Co (item 6.2030805) requires furnaces using liquefied petroleum gases to be equipped with positive shut-off at gas
pressures below
t
Ib/sq.ino AoSoA. has no such reqUirement.A.S.A. Z21.9 - 1948 andZ21.9a - 1949 Standards Page 2 2 3
Section American Standard A.S.A. Bl.l - 1935 AoS.A. B18.2 - 1941 A.S.A. B36.10 - 1939 Canadian Standard C.S.A. Bl.l - 1949 C.S.A. B33.1 - 1950 (C.S.A. B62 - 1949 (C.S.A. B63 - 1949 4 15 7 7 15
American Standard Listing and Installation Requirements
Section Code Number Title
50a) Z21 015 - 1944 Gas valves 80a)
lloa Z21.35 - 1945 Gum protective devices 12)
Z21.18 - 1934 Domestic gas appliance
9) pressure regulators
These references will presumably be brOUght up to date in the revised Z21.9 and should be changed to the corresponding C.S.A. Standards when they are completed.
Miscellaneous 10 Sheet metal gauges
Metal thicknesses are given in gauges. There is no Canadian Standard on ｳｨ･･ｾ metal gauges, although at present C.G.SoBo is working on gauging. The National Building Code, 1953 refers to U.S. Standard gauge.
2. Pipe sizes
Nominal pipe sizes are presumably in accordance with
A.S.A. B36.10 - 1950 (C.S.A. B62 - 1949 and B63 - 1949)
Pipe threads are presumably in accordance with A.S.A. B2.1 - 1945 (no CoS.A. Standard)
3. Test gases
Are Canadian test gases the same?
4. Definitions
Draft hood - differs from N.BoCo Flue - differs from NoBoCo
Heating value (total) - higher calorific value. Others
refer to lower calorific value.
5. Temperatures
Pa&e Section
4 6.d)
3(Addenda) 7 )
15
Minimum melting point of metals 8000F
and 9500
F.
ｾ｡ｸｩｭｵｭ temperature of metal parts, 2300
F
above room temperature of 700
F (i.e.
3000
F)
16 11 Maximum temperature of walls 1200
F and floor 900
F above room temperature of 700
F
(i.e. 1900 and 1600F respectively)
(N.B.Co requires maximpm temperature of 16noF on all adjacent ｣ｯｭ｢ｵｳｴｾ｢ｬ･
surfaces) A.S.A. Z21.16 - 1957
A.S.A. Z2109 - 1948 and Z21.9a - 1949 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 American ｓｴ｡ｮ､｡ｲｾｰ･ｲｭｩｴ a higher maximum wall surface
temperature in some cases than is allowable under N.E.C. require-ments.
-"
6
-The NoBoeo requirements for controls for gas firing, item 602030805 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.
