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Patented Sept. 24, 1946
2,408,047
UNITED STATES PATENT OFFICE
2,408,047
BURNER CONTROL APPARATUS
Lewis L. Cunningham, Glendale, Calif., assignor
to Perfex Corporation, Milwaukee, Wis., a cor
poration of Wisconsin
l Application June 20, 1941, Serial No. 398,923
23 Claims.
(Cl. 158-28)
l
2
This invention relates in general to control
are diagrammatically shown as attached to a
apparatus, and more particularly to automatic
spring member 20 which is riveted at its mid
controls for burners.
point to the bimetal element I2, the contacts I6
The primary object of this invention is the pro
and Il extending through suitable apertures in
vision of a safety control device for a burner
element I2. Contacts I'I and I9 cooperate to form
which functions to place the burner out of opera
an igniter switch for controlling the igniter 2.
tion in the event of flame failure or extinguish
Contacts I6 and I8 cooperate to form a starting
ment of the lire, and which is simple and inex
switch for the relay 3. The bimetal element I2
pensive in construction and reliable in operation.
is provided with a pair of electric heating ele’
Other objects of the invention will become ap 10 ments 2I and 22. When the bimetal element I2
parent from the following description and the
is relatively cold it assumes the position shown in
appended claims.
which the movable contacts I6 and I'I engage
For a full disclosure of the present invention
the fixed contacts I8 and I9, the armature I4 be
reference is made to the following detailed de
scription and to the accompanying drawing, in
ing attracted by the permanent magnet I5 but
:being spaced therefrom by engagement of the
which
Fig. 1 illustrates schematically one form which
the invention may take;
Fig. 2 shows a portion of the apparatus of
Fig. 1 in the position it assumes while the burner 20
movable contacts with the ñxed contacts. How
ever, when the bimetal element I2 is heated under
the action of heaters 2| or 22, this element tends
acter I indicates an electric motor for operating
being deenergized, this element -bows downwardly
a burner which may :be van oil burner o-r a Stoker.
and the movable contacts engage the ñxed con
tacts with snap action.
The relay 3, in addition to the switch arms 5,
6 and -I, also includes a pivoted movable mem
to bow upwardly, being initially restrained from
such movement by the attraction of armature I4
to magnet I5. When element I2 is heated suffi
Fig. 3 is a View similar to Fig. 2 but showing
ciently to overcome the magnetic attraction it
the parts in the positions they assume when the
snaps upwardly, causing the movable contacts
burner is stopped due to flame failure.
to disengage the fixed contacts. When the ele
Referring primarily to Fig. 1, reference char 25 ment I2 cools down due to the heaters 2| and 22
is operating properly; and
The burner might also be a gas burner, and in
such case the motor I would operate the gas
valve therefor. Reference character 2 indicates
an electrical igniter for the burner which may
|ber 24, having an armature portion 25 which is
be of any satisfactory form. The motor I and
adapted to cooperate with the open end of the
the igniter 2 are controlled by means of a relay
U-shaped permanent magnet I5 when the relay
generally indicated as 3. This relay is illustrated
is deenergized. This provides a magnetic shunt
diagrammatically as comprising a coil 4 which 35 and thus decreases the eiïect o-f the permanent
operates switch arms 5, 6 and ‘I through a suit
magnet I5 on the armature I4. The armature
able armature, not shown. When the relay coil
25, movable with the relay, also serves to increase
4 is energized the switch arms 5, 6 and 1 engage
the voltage across relay 4 necessary to cause the
contacts 8, 9 and I0 respectively. When coil 4 is
relay to pull in. The relay also includes a me
deenergized the switch arms are disengaged from 40 chanical stop member 26, which for illustrative
their respective contacts as shown.
purposes is shown as attached t0 the pivoted
The igníter 2 and the relay 3 are controlled by
member 213. This stop member 26 includes an
means of a timing device or switching mechanism
end portion 21 which is located in the path of
generally indicated as I I. This device is diagram
movementl of the movable member or bimetal ele
matically illustrated as comprising a bimetal ele
ment I2 whenever the relay 3 is deenergized.
ment I2 which is ñxedly secured to a lblock I3
When the relay 3 is energized, the stop means
at one end and which carries an armature I 4l
2l is withdrawn from the path of movement of
at its other end, this armature cooperating with
the free end of bimetal element I2, as shown in
Fig. 2.
a permanent magnet I5. The bimetal element
I2 is preferably compensated for changes in am 50
The control system also includes a combustion
bien*l temperature :by well known means (not
responsive device generally indicated as 30. This
shown) and actuates a pair of movable contacts
device may include an expansible element 3I
I6 and Il which cooperate with fixed contacts
which is ñxed at one end and which extends into
I8 and I9 respectively. The movable contacts I6
the stack or combustion chamber of the furnace,
and I'I maybe of any desired construction and. 55 the free end of this member being attached to
2,408,047
3
gaged by the switch arm 5 of the relay, even if
the relay were energized. At this time a potential
starting circuit for the relay 3 is vprovided as
follows: from line wire 53, limit control 52, line
positions a combustion stop means 38 which is CTI wire 54, wire 55, wire 55, bimetal element I2,
movable contact I5, stationary contact I8, wire
shown in the form of a movable abutment. When
51, relay coil 4, wire 58 and transformer primary
no combustion is present, the thermal element 3l
coil 5.0 to line wire 59. As the room thermostat
is cool, which causes the operating beam 34 to
48 is satisfied it opens the circuit through sec
be urged against the cold stop 36. This causes
ondary coil 5I and the transformer primary coil
the abutment 38 to be clear of the path of move
.50 therefore acts as a choke, which prevents sub
ment of the free end of bimetal element I2 as
a non-expanding rod 32 which operates through
a slip friction mechanism 33 to rock an operat
ing beam 34 about a fixed pivot 35 and between
adjustable stops 36 and 31. This operating beam
shown. When combustion takes place the ther-A
mal element 3| becomes heated, expanding and
acting through the slip friction device 33 to rock
the operating beam 34 counter clockwise, thus
bringing the abutment 38 into the path of move
ment of bimetal element I2 as shown in Fig. 2.
stantial flow .of current through the relay coil 4.
The relay 3 is thus deenergized even though the
potential starting circuitl through contacts I8
and L8 is completed.
_
When the room thermostat calls for heat it
closes a circuit between the transformer second
The combustion responsive means 3|) also serves
ary 5| and electric heater 2| as follows: from
to position the movable relay contact B lwhich
secondary 5I, wire 60, thermostat 48, wire 6|,
cooperates with the relay switch arm 5.
heater 2| and wire 62 to secondary 5I.
This is
This
illustrated diagrammatically as accomplished by
an insulating member 39 secured to the operating
beam 3,4, this insulating member carrying a stiff
causes current to flow through the electric heater
`2| Afor heating bimetal element I2 and simul
taneously reduces the choke action of the trans
former 49 suiìciently to permit the relay 3 to pull
Contact arm 4() and an adjusting screw 4 I. The
movable oontaot t may loe carried by a resilient 25 in to running position. Thus switch arms 6 and
1 are brought into engagement with, contacts
arm 4,2 >attached to arm 4i). The operating
9 and I0. However, the switch arm 5 does not
mechanism for the movable relay contact 8 is
at this time engage the contacts B due to the
proportioned so that this Contact. will >remain olis
combustion responsive device still being in its
engaged from the switch arm 5 whenever the
Operating beam 34 1.5 irl its @01d POSÍÍSÍOIJ, 21S 3,0 cold position. Engagement of switch arm 1 with
contact I0 energizes the burner motor I. En
_SïlQWll- A150 the lange @f lllOVQlllQllÍî 0f 'the IllOV
gagement of switch arm 6 with contact 9 estab
able .Contact 8 preferably .should not substantially
lishes an energizing circuit for the ignitcr 2 as
overlap. with that of the switch arm 5. so that
when the switeh. ann 5 is in the position shown
follows; line wire ,54,V wire 55, wire 56, bimetal
dee to the relay beine deenereized it will not be 3,5 element I2, movable contact I1, stationary con
tact I9, wire 64, contact 9, switch arm 5, wire
encased .by the movable Contact 8, regardless of
whether combustion is presentv or not. The com
bustion responsive devise 3G. also may operate a
65 and igniter 2 to line wire 59. Thus when the
thermostat calls for heat the relay 3 is energized,
second switch for controlling the heater 22 of
the timing device II. This switch is diagram
the burner motor being placed into operation
directly and, the igniter being energized through
matically shown as comprising a switch arm 43
the igniter contacts I1 and I9 of the timing de
which is carried by an insulating member 44 at
vice Il. Also the electric heater 2| of the timing
deviçe is energized simultaneously with starting
tackled to >operating beam 34, this switch arm co
operating with a stationary contact 45. The
of the burner, At this time the relay stop mem
movable Contact 43 should engage the stationary 45 ber 21 is withdrawn from the path of movement
contact 45 only when vcombustion is present.
ofthe bimetal element I2 as shown in Fig. 2.
In addition to the control instrumentalities
Occurrence of proper combustion
above described, the system also includes a con-.
dition responsive device 43 which may be a room
If combustion occurs properly the operating
thermostat or other device for starting the burner 5.0 beam 34 will be moved againsty its “hot” stop 31
upon demand for heat and for stopping the same
wherein the abutment 38 is in the path of move
when the demand for heat is satisfied. The con-_
ment of the free end of bimetal element I2. This
same movement of `the operating beam 34 will
trol system also includes a transformer 49 hav
ing a primary coil 50 and a secondary coil 5I.
Preferably the system also includesV a limit or
safety control 52 which may be a thermostat or
pressure responsive device on the furnace for
placing the burner out of operation in case of
excessive furnace temperatures or pressures.
Operation
With the parts in the positions shown, the
roomU thermostat `48, is satisfied, which causes the
relay coii 4v to be deenergized. The motor and
also shift the movable relay contact 8 into en
55 gagement ywith the switch arm 5. Engagement of
contact 8 with switch arm 5 will establish a new
energizing circuit for the relay coil which is in
dependent of the >starting switch I 6-I8. This
holding Ql.'A running circuit is as follows: from line
60 Wire 54, wire 56, flexible arm 42, movable con
tact 8, switch arm 5, wire 61, wire 51, relay coil
4„ wire. 58. and transformer primary `Sil to line wire
59.4 In lresponse to combustion the combustion
responsive device in addition to moving the abut
‘ AVer for the burner at this time are deener'~ 65 ment 3,8 in_to active position and establishing a
holding or running circuit for the relay, also
n d,4 Also the bimetal element I2 is cold, caus
ing the movable contacts I6I andl I1 to engage
causes switch arm 43- to engage contact 4_5 which
the fixed contacts I8 and I9. As the burner is
energizes the heater 2,2;> of the timing device ll.
not in operation the operating beam 34 of the
This `circuit may be traced as follows: from line
combustion responsive dev-ice is in its cold posi 70 wire 54, wire 55, wire 56, bimetal element I2, mov
tion, in which the abutment 38> is clear of the
able contact I1, stationary contact I9, -wire B4,
path of movement of the bimetal element I2.
wire 68, heater 22, wire 69, movable contact 43,
The movable contact 43 at this time is disen
iixed- contact 4_5, wire 1I), ballast resistor 1I, and
gaged from the ñXed contact 45 and the movable
wireV 1-2V to line wire 59,. The heater 2| when en
contact 8 is positioned so that it cannot be en 7'5 ergized alone would cause the movable contacts
$2,408,047
5
6
to snap away from the ñxed contacts in a prede
21 is withdrawn from the path of movement of
termined period of time, such as 90 seconds after
starting of the burner. The purpose oi the heat
bimetal I2. This may be done manually by any
er 22 and the combustion contacts 43-45 is to
indicated diagrammatically in Fig. 1 as compris
ing a plunger 'I5 which is urged inwardly by a
shorten this period when the burner operates
suitable manual reset means.
Such means is
spring 16, this plunger extending through the
properly. When combustion occurs the opera
tion of the igniter is unnecessary and it is desir
abutment member 26 and having an enlarged
able to place it out of operation a short time
head TI. By pulling on a handle portion 'I8 the
thereafter. Due to the heater 22 supplementing
abutment 21 may be withdrawn from the path of
movement of bimetal I2, thus resetting the in
the action of heater 2I, the bimetal element I2
strument for further operation of the burner.
is heated in a short time sufficiently to overcome
the attraction of armature I4 to magnet I5. The
It will be noted that as the transformer primary
5i) is in series with the relay coil, the secondary
bimetal element then snaps upwardly against the
5I of the transformer becomes deenergized when
abutment 38 as shown in Fig. 2, in which posi
tion the movable contacts I6 and I'í are disen 15 the control assumes its lockout position of Fig.
3.» Consequently the heater 2I is deenergized at
gaged from contacts I8 and I9. Disengagement
this time and the bimetal element I2 becomes
of contact I'I from contact I9 breaks the ener
cold. v4Thus when the resetting member ‘I8 is
gizing circuit for the igniter 2 and also breaks
operated, the bimetal I2 snaps to its cold position
the energizing circuit for the heater 22.
The igniter is therefore placed out of operation 20 forv permitting immediate restarting of the
and the heater 22 is deenergized, the bimetal ele
burner.
.
Failure of flame while running
ment I2 being retained in its hot position solely
by the influence of heater 2I. Disengagement of
When the burner has been operating properly
contact IB from contact I8 breaks the starting
but then loses its flame, the operating beam 34 of
circuit for the relay. The relay, however, is
the combustion responsive device 3l! will berocked
maintained energized through the holding or run
clockwise from its “hot” stop 37 to its “cold” stop
ning circuit extending through combustion con
33, thus moving the abutment 38 out of the path
tact 8 and switch arm 5 of the relay. When the
of bimetal element I2 and also shifting the com
circuit, thus deenergizing heater 2l and once 30 bustion contact 3 out of reach of the switch arm 5.
room thermostat becomes satisfied it opens its
The particular sequence of operation which oc
curs upon flame failure during operation of the
a choke for deenergizing the relay coil 4. The
burner depends upon the setting of the adjusting
relay switch arms 5, ä and ï therefore disengage
screw 4I which positions the Contact 8 with re
their respective contacts and the burner stops.
Due to the switch arm 5 now being disengaged 35 spect to the abutment member 38. ¿lf non-recy
cling operation is desired, _the adjusting screw 4I
from the contact 8 the relay cannot be energized
is adjusted so that the Contact 8 remains in en
oncer more until the bimetal element I2 cools
gagement with the switch arm 5 until the abut
down lfor reengaging contacts I6 and I‘I with
ment member 3S is shifted clear of the bimetal
contacts I8 and I9. As a result the burner can
never be started unless the ignition controlling 40 element I2. The relay coil 4 will thus remain
energized and the relay abutment will thus re
contacts I'I and I9 of the timing device I2 are
more causing the transformer ¿i9 to function as
in engagement.
Failure of flame on starting
If combustion does not take place after start- `
ing of the burner, the operatingr beam 3l! of the
combustion responsive device will remain in the
position shown in which the abutment 38 is out
of the path of bimetal element I2, the combustion
mainl out of the path of bimetal I2 at the time
that the combustion abutment 38 releases this
element. The element I2 will therefore snap
from the position of Fig. 2 to the position of Fig.
3. Upon further movement of the operating
beam 34 the contact 8 will disengage from switch
arm 5 which breaks the running circuit for the
relay. The relay will therefore become deen
contact 8 is out of reach of switch arm 5, and in
ergized, moving to its “out” position for stopping
which the switch 43-45 for the accelerating
the burner and causing its abutment 38 to pre
heater 22 is open. Under these conditions the
vent return of the bimetal I2 to its cold position.
burner will operate with the ignition on until the
The burner will therefore remain out of opera
heater 2l heats the bimetal element I2 sufliciently
tion until the control is manually reset.
to cause this element to overcome the attraction ‘ ,
If it is desired that the control recycle after a
of magnet I5. This period is preferably ap
flame failure during operation of the burner, in
proximately 90 seconds. At the end of this period
stead of locking out immediately as above de
the bimetal element I2 snaps upwardly. As the
scribed, the adjusting screw 4I may be adjusted
abutment 33 is not in its path, this element will
so that the movable contact 8 disengages the
snap upwardly to a position beyond the relay
switch arm 5 before the abutment 38 is shifted
abutment member 2`I. At the same time the con
out of the «path of bimetal element I2. With this
tact I6 is disengaged from contact IS ,which
adjustment of screw 4I, upon a flame failure the
breaks the starting circuit for relay coil 4. Due
operating beam 34 will be rocked toward its “cold”
to the holding or running circuit for the relay
stop 36. The first action of this movement will
coil never having been closed, the relay becomes 65 now be to disengage contact 8 from switch arm 5.
deenergized at this time and moves to its “out”
This will break the running circuit for the relay
position for stopping the burner. The relay
coil 3 and consequently this coil will be deener
abutment 2'I now becomes interposed between the
gized and also the heater 2l will be deenergized.
free end of bimetal element I2 and the cold posi
The relay will thus drop out and stop the burner
tion thereof, as shown in Fig. 3, which prevents 70 and the bimetal element I2 will begin cooling.
reengagement of the starting contacts Iii-I 8 and
Due to the abutment 38 still being in engaging
'also prevents engagement of the ignition con
relationship with the bimetal element I2 when
tacts I1 and I9. Due to the maintaining of the
the relay drops out, the relay abutment 21 when
starting contacts I6 and I8 open in this manner,
it returns to the position sh-own in Fig. 1 will not
the relay cannot `be energized until the abutment 75 prevent return movement of the bimetal I 2 to its
2,408,047
7
8
cold position. When the 'bimetal element `t2 cools
dependently of said starting means and under
the control of said heat demand responsive means,
sufficiently to cause reengagement of the mova
and means responsive to failure of combustion
ble contacts .I6 and I1 With the iixed contacts I8
for preventing return of the starting means to
and I9, »the burner will restart in the manner
above described. If combustion now occurs be fi starting position irrespective of said heat .de
mand responsive means.
fore the bimetal-element moves to its hot position,
2. In a burner control system, the combination
the control will operate in the manner described
or, control means responsive to the demand for
for retaining the burner in operation until the
heat for starting and stopping the burner, start
thermostat 48 becomes satisfied. If llame does
not occur within the timing period of the timing 10 ing means movable from an inoperative position
to a starting position, means normally vprevent
device I I the control will lock out in the manner
ing the burner from starting when the starting
described above and will retain the burner out of
means is in said inoperative position and provid
operation until the control is manually reset.
ing for starting of the burner when the start
Power failure
ing means is in starting position, said starting
means moving to inoperative position after start
In the event that the :power should fail While
ing of the burner, running means including com
the burner is running and after the ignition is
bustion responsive means and a movable member
cut off, the relay 3 will drop out and the heater 2l
operated thereby, said movable member being
will become deenergized. W hen power is restored
the burner Will not start until the bimetal ele 20 moved to running position only upon presence of
combustion and serving to maintain the burner in
ment cools down and returns to its cold position
operation independently of said starting means
in which the starting switch and the timer ig
and under the control oi said heat demand re
nition switch are closed. In the event that a
sponsive means, means including mechanical
power failure occurs just after the burner is
holding means acting upon failure of combustion
started and before the bimetal AI2 shifts to its
to prevent return movement of the starting means
hot position, the relay will drop out as above de
to starting position, and manual reset means for
scribed. Due to the magnetic shunt 25 being
said holding means,
shifted adjacent the permanent magnet I5 upon
3. In a burner control system, the combination
dropping out of the relay, the attraction of arma
ture III to permanent magnet I5 Will ‘be consid 30 of, control means responsive to the demand for
heat for starting and stopping the burner, start
erably reduced, Consequently ii bimetal element
ing means movable from an inoperative position
I2 is heated a substantial amount it will now snap
to a starting position, means normally preventing
to its “hot” position. The burner therefore can
the burner from starting when the starting means
not restart until the bimetal element .I2 cools
is in said inoperative position and providing for
and returns to its cold position. This arrange
starting of the burner when the starting means
ment insures a full trial starting `period When
is in starting position, said starting means mov
power is resumed.
ing to inoperative position irrespective of com
From the foregoing description it Will be ap
bustion after starting of the burner, running
parent that the present invention provides a sim
means including combustion responsive means
`ple burner control system which provides for a
and a movable member operated thereby, said
safety shut down oi the burner in the event of
movable member being moved to running Dosi
flame failure either upon starting of the burner
tion only upon presence of combustion and serv
or while the burner is running. It will also be
ing to maintain the burner in operation independ
apparent that the present invention controls the
ignition for the burner` and provides an entirely 45 ently of said starting means and under the con
trol oi said heat demand responsive means, means
safe sequence of operation. While I have shown
including mechanical holding means acting upon
and described a preferred form of the invention,
failure or” combustion to prevent return move
it is obvious that many changes may be made
ment
of the starting means to starting position,
without departing from the spirit and scope of
the invention. Also various parts may be omitted 50 and manual reset means for said holding means.
fi. In a burner control system, the combination
from the complete system Without departing from
or, control means responsive to the demand for
the invention. For example, the ignition contacts
heat for starting and stopping the burner, start
I1 and i9 may be omitted Where it is desired that
ing means movable from an inoperative position
the igniter operate continuously with the burner.
to a starting position, means normally prevent
Also the relay switch arm 5 could be omitted in 55
ing the burner from starting when the starting
certain applications of the invention. It is de
means is in said inoperative position and provid
sired to be limited only by the scope of the ap
ing for starting of he burner when the starting
pended claims.
means is in starting position, said `starting means
What is claimed is:
moving to inoperative position after starting of
60
1. In a burner control system, the combination
the burner, running means including combustion
oi, control means responsive to the demand for
responsive means and a movable member oper
heat for starting and stopping the burner, start
ated thereby, said movable member being moved
ing means movable from an inoperative position
to
ruiming position only upon presence of com
to a starting position, means normally preventing
the burner from starting when the starting 65 bustion and serving to maintain the burner in
operation independently of said starting means
means is in said inoperative position and provid
and under the control of said heat demand re
ing for starting of the burner when the start
sponsive means, said running means being in
ing means is in starting position, said starting
capable of initiating operation of the burner ir
means moving to inoperative position irrespec
respective oi‘ said vcombustion responsive means,
tive of combustion after starting of the burner,
and means acting upon failure of combustion to
running means including combustion responsive
prevent return of the starting means to starting
means and a movable member' operated thereby,
position irrespective of said heat demand respon
said movable member being moved `to running
sive means.
position only upon presence of combustion and
5. In a burner control system, the combination
serving to maintain the burner in operation ín 75
2,408,047
10
of, control means responsive to the demand for
switch means operative when combustion is pres
heat for starting and stopping the-burner, start
ent and inoperative at all times when combustion
is not present, means actuated after starting of
the burner for moving the starting switch from
said starting position, and means including sec
ond combustion responsive means for controlling
said starting switch selectively to eiïect return
ing means movable from an inoperative position
to a starting position, means normally prevent
ing the burner from starting when the starting
means is in said inoperative position and provid
ing for starting of the burner when the starting
means is in starting position, said starting means
moving to inoperative position after starting of
the burner, running means including combustion
responsive means and a movable member operated
thereby, said movable member being moved to
running position only upon presence of combus
tion and serving to maintain the burner in oper
movement
thereof
to
starting . position » after
proper combustion or to maintain it away from
starting position upon combustion failure.
9. In a burner control system, the combination
of, a relay for starting and stopping the burner,
condition responsive means responsive to the de
mand for heat in` circuit with said relay, means
ation independently of Vsaid starting means and ll5 including a starting switch for said relayA and ar
ranged to prevent starting of the `burner until
under the control of said heat demand responsive
the starting switch is in starting position, hold
means, said running means being incapable of
initiating operation of the burner irrespective of
ing switch means - operated by said relay and
adapted. to maintain the burner in operation in
said combustion responsive means, means includ
ing mechanical holding means and acting upon 420 dependently of said starting switch, said holding
failure of combustion to prevent return move
switch means being incapable of initiating oper
ment of the starting means to starting position,
ation of the burner, means including combustion
responsive means for rendering said holding
and manual reset means for said holding means.
6. In a burner control system, the combination
switch means operative when combustion is pres
of, control means responsive to the demand for .25 ent and inoperative at all times when combustion
heat for starting and stopping the burner, start
is not present, means actuated after starting of
ing means movable from an inoperative position
the burner for moving said starting switch from
to a starting position, means normally prevent
said starting position, and means operative upon
ing the burner from starting when the starting
failure of combustion for preventing return move
means is in said inoperative position and provid :30 lment of said starting switch` to starting position
ing Vfor starting of the burner when the starting
irrespective of said condition responsive means.
means is in starting position, said starting means
' 10. In a burner control system, the combina
moving to inoperative position irrespective of
tion-of, a relay for starting and stopping the
combustion after starting of the burner, running
burner, control means for controlling said relay,
means including combustion responsive means 35 starting switch means for controlling the relay
and a movable member operated thereby, said
and arranged to prevent starting of the burner
movable member being moved to running posi
until the starting switch means’ is in starting‘posi
tion only upon presence of combustion and serv
tion, means including a running Switch for con
ing to maintain the burner in operation in
trolling said relay and arranged to maintain the
dependently of said starting means and under the> 40 burner in operation under the control of said
control of said heat demand responsive means,
control means independently of said starting
said running means being incapable of initiat
switch means, ñrst means including combustion
ing operation of the burner irrespective of said
responsive _means for actuating said running
combustion responsive means, and means acting
switch to maintain the burner in operation in
upon failure of combustion to prevent return of 45 dependently of said starting switch means only
the starting means to starting position irrespec
while proper- combustion takes place, means actu
tive of said heat demand responsive means.
ated after starting of the burner for moving said
7. In a burner control system, the combination
starting switch means from starting position ir
of, control means for starting and stopping the
respective of combustion, and second means in
burner including-a, starting circuit for the burner,
cluding combustion responsive means for selec
starting switch means for said starting circuit,
tively preventing return or effecting return of
a running circuit for maintaining the burner in
the starting switch means to starting position.
operation under the control of said control means
11.A In a burner control system, the combination
independently of said starting circuit and being
of, a relay controlling the burner and having a
incapable of initially placing the burner into
i’irst position in which the burner operates and a
operation, ñrst combustion responsive means for
second position in which the burner is normally
rendering the running circuit inoperative at all
out of operation, heat demand responsive means
times when combustion is not present, and means
for controlling said relay and normally causing
including second combustion _responsive means
said relay to assume its first position upon de
for controlling the starting switch means selec
mand for heat and to assume its second position
tively to open the starting circuit and maintain
when the demand for heat is satisiied, means in
the same open upon failure of combustion, or for
cluding a starting switch for preventing move
opening the starting circuit and effecting reclos
ment of the relay from its second position to its
ing of the same thereafter if combustion is proper.
first position unless the starting switch is in start
8. In a burner control system, the combination 65 ing position, actuating means for the starting
of, control means for starting and stopping the
switch including a timing device for moving said
burner, a starting switch arranged to prevent
starting switch from starting position a period
of time after starting of the burner, means in
starting of the burner by said control means until
cluding combustion responsive means for main
the starting switch is in a starting position, run
ning switch means arranged to maintain the 70 taining the relay in its iirst position independently
.of said starting switch when. combustion is pres
burner in operation under the control of said con
ent while causing movement thereof to its sec
trol means independently of the starting switch
ond ,position >upon vfailure -of combustion, and
means and being incapable of initiating opera
stop -means controlled con-jointly by the 4relay
tion of the burner, means including ñrst combus
and Acombustion responsive means for prevent
-tion responsive means for rendering the running
2,408,047
11
12
ing movement of the starting switch to starting
causing said relay to assume its first position upon
position upon failure of combustion with the relay
demand for heat andto assume its second posi
in its first position, while permitting return of
tion when the demand-for heat is satisfied, means
the starting switch to starting position upon
including a movable member and arranged to
movement of the relay to its second position prior Gi prevent the relay from moving from its second
to- termination of combustion.
to its first position unless said movable member
l2. In a burner control system, the combina
is in starting position, means for causing said
tion of, a relay controlling the burner and having
movable member to move away lfrom starting po
a firstr position in which the burner operates and
sition. a, period of time after starting of the burner,
a second' position in which the burner is normally 10 means including combustion responsive means for
out of operation, heat demand responsive means
maintaining the relay in its first position if com
for controlling said relay and normally causing
bustion is present, and stop means controlled
said relay to assume its ñrst position upon de
conjointly by the relay and combustion respon
mand for heat and to assume its second position
sive means for preventing' movement of said
when the demand for heat is satisfied, means
movable member to starting position upon failure
including a starting switch for preventing move
of combustion With the relay in its first position,
ment of the relay from its second position to its
while permitting return of the movable member
first position unless the starting' switch is in start
to starting posiltion upon movement of the relay
ing position, actuating means for the starting
to its second position prior to termination of
switch' including a timing‘device for moving said 20 combustion.
stanting switch from starting position a period of
l5. In a burner control system, the combina
time after starting of the burner, means includ
tion of, a relay controlling the burner and having
ing .combustion responsive means' for maintaining
a first position in which the burner operates and
the' relay in its first position independently of
av second position in which the burner is nor
said starting switch when combustion is present 25 mally out of operation, heat demand responsive
While causing movement ithereolf to its second
means for controlling said- relay andV normally
position upon failure of combustion, stop means
causing said relay to assume its first position upon
actuated by movement of the relay to its second
demand for heat and to assume> its second posi
position for preventing movement of the starting
tion when the demand for heat is satisfied, means
switch to starting position, and combustion re 30 including a movable member arranged to prevent
sponsive means for preventing said stop means
the burner from starting unless said movable
from being effective when the relay moves to its
member is in starting position, means for causing
second position while combustion is present.
said movable member to move away from starting
13; In a burner control system, the combina
position a period of time a'fter starting of .the
tionA of, a relay controlling the'burner and having 35 burner while permitting said burner to continue
a first position in which the burner operates and
to operate, and means controlled by the relay and
a second position in which the burner is normally
combustion responsive means for causing the
out of operation, heat demand responsive means
movable member to remain away from starting
for controlling> said' relay and normally causing
position upon failure of combustion with the re
said relay to assume its first position upon de 40 lay in its first position, while effecting return of
mand for heat and to assume its second position
the movable member to starting position after
when the demand for heatv is satisfied, means in
movement of the relay to its second position prior
cluding a staiitlng switch for preventing move
to termination of combustion.
ment of the relay from its second position to its
16. In a burner control system, the combina
ñrst position unless the starting switch is in
tion of, a relay controlling the burner and having
starting position, actuating means for the s'tart
a ñrst position in which the burner operates and
ing switch including a, timing device for moving
a second position in which the burner is normally
said starting switch from starting position a pe
out of operation, heat demand responsive means
riod of time after starting of the burner, a mov
for controlling said relay and normally causing
ableV stop member adapted when in operative
said relay to assume its first position upon de
position to'limit movement of theactuating means
mand for heat and to assume its second position
after movement of the starting switch from
when the demand for heat is satisfied, means
starting position, said movable stop member when
including a movable member arranged to pre
inY inoperative position permitting continued
vent the burner from starting unless- said mov
movement of the’ actuatingl means, means for 55 able member is in starting position, means for
moving said stop member' to operative position
causing said movable memberA to move away
when »combustion is present and for moving said
from starting position a period of time after
stop` member to inoperative position when com
starting of the burner while permitting said
bustion is absent, means including combustion
burner to continue to operate, stop means actu
responsive means for maintaining the relay in 60 ated by movement of the relay to its second
its ñrst position independently of said starting
position lfor preventing movement of the movable
switch. when combustion is present while'causing
member to starting position, and combustion re
movement thereof to its second position upon fail
sponsive means for preventing said stop means
ure of combustion, and a second stop member op
from being effective when the relay moves to its
erated by said relay upon movement to its second
second position While Icombustion is present.
position and adapted to prevent return of the
17. In a burner control system, the combina
starting switch to starting position unless the
tion of, a relay controlling the burner and having
movementof said actuating means is'` limited by
a first position in which the burner operates and
said first stop member.
a second position in which the burner is normally
14. In a burner control system, the combina
out of operation, heat demand responsive means
tion‘ of, a relay 'controlling' the burner and hav
for controlling said relay and normally causing
ing a iirst position in which the burner operates
said relay to assume its ñrst position upon de
and a second position in which the burner is nor'
mand for heat and to assume its second position
mally out of operation, heat demand responsive
when lthe demand for heat is satisfied, means
means for controlling said relay and normally 75 including relay actuated' means actuated by
2,408,047
13
movement of the relay to its second position for
preventing movement of the relay to its ñrst
position, and combustion responsive means for
preventing said relay actuated means from being
effective when the relay moves to its second posi
tion while combustion is present.
18. In a burner control system, a source of high
voltage, a high voltage switch for selectively
connecting or disconnecting the source of high
voltage and the burner, means comprising a low
voltage circuit and a room thermostatic switch
connected therein for operating said high voltage
switch, a movable member, means for normally
causing said movable member to move from start
14
operation, automatic means for restarting the
burner following a purging period after such
name failure shutdown, and selective means for
selectively preventing or permitting restarting of
the burner by said automatic means.
22. In a burner control system, the combina
tion of, a relay for controlling the burner, means
including a movable member arranged to pre
vent initial energization of the relay unless the
10 movable member is in starting position, means for
causing said movable member to move from start
ing position toward a second position after ener
gization of the relay, a ñrst movable abutment
operated by the relay and moved into the path
ing position to running position after the burner 15 of movement of the movable member when the
starts and to return to starting position after
the burner stops, means comprising a second high
voltage switch operated by said movable mem
relay is deenergized and out of the path of move
ment of said movable member when the relay is
ber for preventing the iirst high voltage switch
from initially closing unless the movable member
is in starting position, and means responsive to
lack of combustion for opening said ñrst high
voltage switch and for preventing return of the
movable member to starting position.
prevent return of the movable member from its
energized, said iirst abutment being adapted to
second position back ~to starting position, combus
tion responsive means, a second movable abut
ment operated by the combustion responsive
means, said second abutment being moved out of
the path of movement of the movable member
19. In a burner control system, means respon 25 when' combustion is not present and being moved
sive to the demand for heat for stopping and
into the path of movement of the movable mem
starting the burner, means including first com
ber when combustion is present, said second abut
bustion responsive means for stopping the burner
ment in such position preventing the movable
in case of ilame failure during operation, said
member from moving to said second position.
iirst combustion responsive means being incapa 30
23. In a burner control system for a burner
ble of preventing restarting of the burner, means
having a motor and igniter, the combination of,
including second combustion responsive means
a relay for controlling the motor and igniter, a
arranged to maintain the burner out of operation
safety switch for controlling the relay, an igni
until manually reset, and means for relatively
tion switch, timing means, means including a
adjusting the combustion responsive means to
movable member operated by the timing means
selectively provide a recycling or non-recycling ~
and having a starting position in which both
sequence of operation.
of said switches are closed and a second position
20. In a burner control system, the combina
in which said switches are open, combustion
tion of, combustion responsive means for shut
responsive means acting upon presence of com
ting down the burner in case of flame failure, 40 bustion to maintain the relay energized after
automatic means for restarting the burner fol
said movable member moves from starting posi
lowing a purging period after such flame failure
tion, a ñrst movable abutment operated by the
shutdown, and adjustable means for selectively
relay and moved into the path of movement
preventing or permitting restarting of the burner
of the movable member when the relay is deen
by said automatic means.
45 ergized and moved out of said path when the
2l. In a burner control system, the combina
relay is energized, a second movable abutment
tion of, means including timing means and com
operated by the combustion responsive means,
bustion responsive means iîor providing a trial
said second abutment being moved out of the
operating period of the burner when first started,
path of movement of the movable member when
said means being constructed and arranged to 50 combustion is not present and being moved into
permit continued operation if combustion is ob
said path when combustion is present, said sec
tained'but to stop the burner and prevent fur
ond abutment in the latter position preventing
ther operation until manually reset if combustion
the movable member from moving to said second
is not obtained, means for shutting down the
position.
burner on llame failure while the burner is in 55
LEWIS L. CUNNINGHAM.
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