IEC 60730-2-5:2013/AMD2:2021

IEC 60730-2-5 ®
Edition 4.0 2021-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 2
AM ENDEMENT 2
Automatic electrical controls –
Part 2-5: Particular requirements for automatic electrical burner control systems

Commandes électriques automatiques –
Partie 2-5: Exigences particulières pour les systèmes de commande électrique
automatique des brûleurs
IEC 60730-2-5:2013-11/AMD2:2021-01(en-fr)

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IEC 60730-2-5 ®
Edition 4.0 2021-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 2
AM ENDEMENT 2
Automatic electrical controls –

Part 2-5: Particular requirements for automatic electrical burner control systems

Commandes électriques automatiques –

Partie 2-5: Exigences particulières pour les systèmes de commande électrique

automatique des brûleurs
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 97.120 ISBN 978-2-8322-9282-2

– 2 – IEC 60730-2-5:2013/AMD2:2021
© IEC 2021
FOREWORD
This amendment has been prepared by IEC technical committee 72: Automatic electrical
controls.
The text of this amendment is based on the following documents:
FDIS Report on voting
72/1259/FDIS 72/1262/RVD
Full information on the voting for the approval of this amendment can be found in the report on
voting indicated in the above table.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the stability date indicated on the IEC website under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The "colour inside" logo on the cover page of this document indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.

_____________
FOREWORD
nd rd
Replace the 2 sentence in the 3 paragraph with the following:
It was established on the basis of the fifth edition:2013, including Amendment 1:2015 and
Amendment 2:2020 of that publication.
Delete the paragraph beginning with "The title of IEC 60730-2-5 Ed. 4 has been …".
th
Replace the 5 dashed entry in paragraph beginning with "The "in some countries" notes
regarding…" with:
– H.26.11.101
th
Replace the 6 dashed entry in paragraph beginning with "The "in some countries" notes
regarding…" with:
– Table H.24, Note i
© IEC 2021
1 Scope and normative references
1.1 Scope
Add "Replacement" below the title of 1.1.
Add the following as a new bullet point before Note 1:
• to a burner control system intended to be used in warm air heating appliances (furnaces)
where the appliance is equipped with an electromechanical differential pressure control to
monitor the difference of the combustion air pressure (Type 2.AL). This pressure control
provides a switch as an alternative to one of the two switching elements to directly de-
energize the safety relevant terminals.
Add the following new paragraph as the last paragraph of 1.1:
This document applies to controls powered by primary or secondary batteries, requirements for
which are contained within the standard, including Annex V.
Add the following new subclauses:
1.1.7 This document applies to the electrical and functional safety of controls capable of
receiving and responding to communications signals. The signals may be transmitted to or
received from external units, connected wired or wireless, that may or may not be part of the
burner control system.
1.1.8 This document does not address the integrity of the output signal to the network devices,
such as interoperability with other devices, unless it has been evaluated as part of the control
system.
2 Terms and definitions
2.2 Definitions of types of control according to purpose
Replace the Note with the following:
2.2.23 Not applicable.
2.3.127
Add to the Note 1 to entry the words "and Canada" after "USA".
Delete definition 2.3.131.
6 Classification
6.4 According to features of automatic action
Addition:
6.4.3.110 − electromechanical differential air pressure switch as an alternative to one of the
two switching elements to directly de-energize the safety relevant terminals (see 11.3.5.2) for
use in warm air heating appliances (furnaces) (Type 2.AL).
NOTE The warm air is the heat transfer media to heat up a space.

– 4 – IEC 60730-2-5:2013/AMD2:2021
© IEC 2021
7 Information
7.2.6 Replace the existing text with the following:
Replacement:
Except as indicated in 7.4, for integrated systems all information is provided by means of
declaration (X). For incorporated systems not declared under item 50, the marking required is
as indicated in Table 1 (7.2 of the previous edition). For incorporated systems declared under
item 50, the only marking required is the manufacturer's name or trademark and the unique
type reference if other required marking is provided by documentation (D, E).
NOTE See the explanation of documentation (D, E) contained in 7.2.1.
Table 1 − Required information and methods of providing information
Add the following new items to the table:
141 Electromechanical differential pressure control for use with Type 2.AL 6.4.3.110, 11.103.3 X
burner control systems
142 (Type 2.AL) burner control systems for use in warm air heating 11.3.5.2, 11.103 X
appliances (furnaces)
11 Constructional requirements
11.3.5 Contacts – General
Replace the existing Subclause 11.3.5.2 by the following:
11.3.5.2 Replacement:
Systems of class C control functions shall include at least two switching elements to directly
de-energize the safety relevant terminals.
NOTE 1 A single relay operating two independent contacts is considered to be only one switching element.
Designs where relays are used as switching elements, a non-replaceable fuse (see Table H.24
Note I) in series with two independent relay contacts with I fuse < 0,6 * I relay are considered
N e
to comply with the following requirements for prevention of common cause error.
NOTE 2 I : values for the fuse (see IEC 60127-1:2015, 3.16);
N
I : rated operational current of the contact (see IEC 60947-1:2007; 4.3.2.3).
e
As an alternative to the two switching elements that directly de-energize the safety relevant
terminals, burner control systems (Type 2.AL) are permitted and shall meet all of the following:
• have at least one switching element that directly de-energizes the safety relevant terminals
and be connected to an external pressure control in such a manner that both the direct and
indirect switching contacts are in series to each other,
• be integrated within the warm air heating appliances (furnaces),
• meet the requirements of 11.103.
NOTE 3 The burner control system is a class C control function.
In Part 1, the term
© IEC 2021
• “safety related output terminals” is equivalent to “valve terminals”.
• “safety shut-down” shall be used as defined in this document,
• “control” shall be used as “burner control systems”.
11.4.105
Add in the first paragraph after "Type 2.AF" the text "or Type 2.AL".
nd
Replace in the 2 paragraph "positive" with "sufficient".
Add at the end of the clause the following Note:
NOTE Sufficient external air pressure/flow control signal is indicated by closed switching contacts and an
insufficient external air pressure/flow control signal is indicated by open switching contacts.
11.102.2 Performance requirements
Replace the existing text with the following:
The reset from lock-out function shall be a class B control function according to H.27.1.2.2.
The use of an automatic action to perform the reset from lock-out function (e.g. resets
generated by automatic devices, like timers, etc.) shall be permitted provided it is accepted by
the specific application standards.
Unintended or spontaneous resets from lockout which may impact the safe behavior of the
appliance shall not occur.
Whenever the reset from lock-out function is performed by the use of a mobile device, at
least two manual actions are required to activate the reset.
Any fault within the reset function shall not cause the appliance to operate outside the
applicable requirements. It shall be detected before the next start-up or shall not prevent the
appliance from going to shut-down or lock-out.
For reset functions where the manual action is initiated without being within the visible sight
of the appliance, the following additional requirements apply:
– actual status and relevant information of the process under control shall be visible to the
user before, during and after the reset action;
– maximum number of resets shall be limited. Where it is not specified in the specific
application standard, the number of resets shall be limited to five actions or less within a
time span of 15 min. Following this, any further remote resets shall be denied unless a non-
remote reset from lock-out.
If the reset action is activated by manual switching of a thermostat or device with a similar
function, this shall be declared by the manufacturer.
For systems where unintended resets do not impact the safe behavior of the controlled
appliance, any kind of remote reset device (including class A control function) is used, if a at
least class B control function of the burner control system is limiting the maximum number of
resets to five actions or less within a time span of 15 min. Following this, any further remote
resets shall be denied unless a non-remote reset from lock-out.
Add after 11.102, the following new Subclause 11.103:

– 6 – IEC 60730-2-5:2013/AMD2:2021
© IEC 2021
11.103 Application requirements for the use of Type 2.AL burner control systems in
warm air heating appliances (furnaces)
11.103.1 General
The design of Type 2.AL burner control systems for warm air heating appliances (furnaces) is
intended for appliances that shall have the following construction:
• An operating range of the turn down ratio between 30 % and 100 % combustion air flow.
• The draft inducer motor, the draft inducer motor drive circuit, the differential pressure control
in the appliance and the burner control shall all be part of the entire burner control systems
and shall comply with the relevant clauses for class C control functions including the
conditions that exist due to integration in the appliance.
NOTE The intent of this is to recognize that with this type of burner control systems, all of the external circuits
and/or components are considered together in the design of the circuit to meet the requirements of class C
control function.
• Heat input does not exceed 120 kW.
• For non-permanent operation.
• For room independent applications, the combustion air inlet and the combustion products
outlet on the building shall be in close proximity, see Figure 102.
• The operating voltage to the safety relevant terminals is SELV delivered by a SELV
transformer within the appliance.
• When a short-circuit of the direct switching element is detected, the system shall
immediately perform safety shut down, any ventilation and automatic restart shall be
prevented.
Figure 102 – Typical installation of the independent
combustion air supply for room independent operation
11.103.2 The contacts of the electromechanical differential pressure sensing control shall be
connected in series with the direct switching element in the burner control that directly de-
energizes the safety-relevant terminals of the control.
11.103.3 The terminals of the burner control intended for the connection of the external
pressure sensing control shall be considered safety relevant and comply with the appropriate
requirements of Clause 20 for functional insulation, considering that it drives the gas valve.
11.103.4 To maintain the safety integrity of the burner control system, the manufacturer shall
specify the classification of the pressure sensing control used in the appliance by the following
parameters:
• operating control with Type 2.B.N action,
• ratings – electrical, thermal and mechanical with the amount of cycles as given in 6.11,

© IEC 2021
• complying with the appropriate requirements of Clause 20 for functional insulation,
considering that it drives the gas valve.
NOTE Type 2.B is described in IEC 60730-1 as micro-disconnection and Type 2.N is described in IEC 60730-2-6.
11.103.5 For Type 2.AL burner controls intended to be used in warm air heating appliances
(furnaces), the contacts/terminals of the electromechanical differential pressure control shall be
monitored continuously during start-up and operating sequence.
15 Manufacturing deviation and drift
15.5 Operating times
st nd
Add at the end of the 1 and 2 paragraph the following:
"as soon as thermal equilibrium has been reached."
17 Endurance
17.1 General requirements
17.1.3 Test sequence and conditions
Replace the second paragraph starting with "The number of operations performed…" with the
following:
The same sample shall be used for the following test sequence. The number of automatic cycles
performed during each of the tests in 17.16.101, 17.16.102 and 17.16.104 shall be recorded.
When the actual number of automatic cycles completed is equal to the number declared in 6.11,
this test sequence is concluded and the following sequence is performed:
25 Normal operation
Replace the existing text with the following:
Replacement:
This clause of Part 1 is applicable except as follows:
25.2 Overvoltage and undervoltage test
Not applicable.
27 Abnormal operation
Replace the existing text with the following:
This clause of Part 1 is applicable.

– 8 – IEC 60730-2-5:2013/AMD2:2021
© IEC 2021
Annex H
(normative)
Requirements for electronic controls
Add the following new clause:
H.2 Terms and definitions
This clause of Part 1 is applicable except as follows:
H.2.23.3
Replacement:
defined state
means lock-out or safety shut-down
H.26.2
Replace "H.26.12" with "H.26.14".
H.26.9 Electrical fast transient/burst test
Replace the existing title with the following:
Electrical fast transient/burst immunity test
H.26.9.3 Test procedure
nd nd
Replace in the 2 sentence in indent a) of the 2 paragraph the word "not" with "nor":
H.26.10 Ring wave test
H.26.10.4 Test levels
Delete Table H.103.
H.26.10.5.105
st
Replace at the end of 1 sentence the reference to "H.26.10.5.101.6" with "H.26.10.5.106".
H.26.12 Radio-frequency electromagnetic field immunity
Delete "H.26.12.2.1 Test levels for conducted disturbances"
and
"The tests on interface cables are not carried out if the manufacturer explicitly specifies that the
length of that cable shall not exceed 1 m."
H.27.1.1.5 Electronic circuit fault conditions
Modification:
Replace the title of Table H.24 with the following:

© IEC 2021
Table H.24 (H.27.1 of edition 3) – Electrical/electronic component fault modes table
Replace the text "Replace note 12" with "Replace note m".
Add, after footnote m, the following new text:
p
Add in Table H.24 under the column "short" and in the line "Contacts", the footnote " ".
Add, after last dot, the following new text:
Add the following footnote to Table H.24:
p
Spontaneous closing of relay contacts is not considered without energizing the coil of the relay.
H.27.1.2.3.2 First fault
st
Replace in the brackets of the 1 sentence "H.21" with "H.24".
...