ANSI Z21.78-2010/CSA 6.20-2010 (R2015)
1.1 Scope
1.1.1
This standard applies to newly produced combination gas controls (see Definitions, Part IV), hereinafter
referred to as controls, constructed entirely of new, unused parts and materials.
1.1.2
The combination control may include other functions such as pilot gas filters, pressure switches, etc.,
which shall be of an approved type (see Definitions, Part IV), or shall be investigated as an integral part of
the combination control for construction and performance equivalent to an approved type.
A control which incorporates two or more automatic valves and no other function, (as defined by
combination control, see Definitions, Part IV), may be tested to this Standard or Automatic Valves for Gas
Appliances, Z21.21 • CSA 6.5, at the discretion of the manufacturer.
1.1.3
Compliance of a combination control with this standard does not imply that the combination control is
acceptable for use on gas appliances without supplemental tests with the combination control applied to
the particular appliance design.
1.1.4
This standard applies to combination controls having a maximum operating gas pressure of 1/2 psi (3.5
kPa) with one or more of the following fuel gases: natural, manufactured, mixed, liquefied petroleum and
liquefied petroleum gas-air mixtures.
1.1.5
This standard applies to combination controls which are capable of operation in ambient temperatures of
32°F (0°C) to 125°F (51.5°C), unless a higher temperature, lower temperature or both, are specified by the
manufacturer.
1.1.6
Exhibit A, Items Unique to the United States, contains items unique to the United States.
1.1.7
Exhibit B, Items Unique to Canada, contains items unique to Canada.
1.1.8
Exhibit C, List of Reference Standards, specifically referenced in this standard, and sources from which
these reference standards may be obtained.
1.1.9
If a value for measurement as given in this standard is followed by an equivalent value in other units, the
first stated value is to be regarded as the specification.
1.1.10
All references to psi through this standard are to be considered gauge pressure unless otherwise specified.
OEN:
CSA
Langue:
English
Code(s) de l'ICS:
75.180.99
Statut:
Norme
Date de Publication:
2011-02-28
Numéro Standard:
ANSI Z21.78-2010/CSA 6.20-2010 (R2015)