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Sept. 10, 1946.
‘
E. P. NEWMANl
'
`BURNER CONTROL.
-
2,407,433
^
Filed‘Juney 15, 1944 '
l
2 Sheets-Sheet 1
.95
/A/L/t'A/roe:
Emo R Mew/VAN,
Err-0 R ME /6 .
Sept. 10, 1946.`
.- E. P. NEWMAN
2,407,438 l
BURNER CONTROLv
Filed June 15,- 1944
' 96)
2 sheets-shéet 2
2,407,438
Patented Sept. 10, 1946
UNITED STATES PATENT OFFICE
. 2,407,438
BURNER CONTROL
Eric P. Newman, Clayton, Mo., assig'nor to Auto
matic Control Corporation, St. Louis, Mo., a
corporation of Delaware
Application June 15, 1944, serial No. 540,372
11 claims. (o1. 15s-_1171) v
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II,’ a pilot burner I2, an igniter I3, and afname
The present invention relates to a control, and
switch I4. ~In addition, it comprises a relay actu
particularly a control for burners andthe like. Y
ated'main Vvalve mechanism I5, and a relayv actu
ated pilot valve mechanism I6, and a transformer
»It comprises vbroadly a main fuel'valve in a
main fuel line, a pilot fuel valve in a pilot fuel
line, and an igniter, all under control of some
I1.
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.The main burner is fed from a fuel line 20,
external control such as a space or room thermo
which leads tothe main valve mechanism I5, and
stat, with suitable switches and connections to
operate the burners safely.'
An object of the invention is to provide a c'òn
trol' wherein, in response to external demand for
heat, the pilot name is ignited, andgin response
to a substantial and rapid change in heat at the
pilot, the main fuel line is opened. More particu
thence by a line 2I to the burner I I. A pilot line
22 is >connected into the main line 25 ahead oi-the
main valve mechanism I5, the'line22 leading to
the pilot valve mechanism I6, and'thence by a
line 23 to the pilot burner I2.
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The main valve mechanism I5 includes a valve
to ignite a main burner and’also as the actuating
member 25 operating againsta valve seat 26 >in
terposed between the fuel lines 20 and 2I. The
valve is actuated by a'magnetic coil >2l, which,
means for a flame switch which controls the main
when energized, opens the valve.
larly, an object is to provide a control wherein
the pilot acts in a dual capacity of being a means
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The pilot valve mechanism I6 comprises ra ball
type valve element 30 adapted to seat upon a seat
A further object of the invention is to'provide
a> control wherein a failure of the flame switch 20 3|, toward whichvit is urged by a spring 32. The
seat V3| is disposed between the lines 22 and 23.
to open or a short-circuitingof the flame switch
The valve is actuated by a pin 33 extending up
at the time of av call for heat will result in a lock
valve actuating circuit.
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beneath the valveseat. ‘ A flexible diaphragm 34,
out of both main and pilot fuel valves,
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» A further object is to provide a control system
for a fuel burning system which is entirely auto
supported on thevalve housing and` secured in
25 sealing relation tothe pin 33, seals >the pin to
matic from one winter season to the next, which
wastes no pilot gas when heat is not needed, and
which is small and can be installed 'at avery
reasonable cost.
Another 'object is a control Which'will operate 30
regardless of changes invambient temperature in
the furnacebefore, during, or after fuel com
bustion.
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prevent leakage of gas around’it. The pinj33 is,
in turn, attached to an ¿armature 35, operated by
a magnetic coil 36, the latter elements, together
with a coil 66, forming 'a relay generally desig
nated31.
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" AThe flame îactuated switch I4 is preferablyA of
the rate of change type; An illustrativev form of
it comprises archannel-shaped supporting mem...
A further object is to provide a control system
' ber 4l), having V.flanges 4I ~thereon,’by means of
operable with either alternating or direct current.
which it maybe securedproperly to the burner.
This channel-shaped member 40 embraces and
Further objects of the invention include the
provision of` a control wherein a momentary break
of the pilot valve .relay circuit, such as vby the
walking of or manual vibration of the room ther
mostat or a momentary power failure`,`wi1l cause
a complete recycling to prevent escape of un
burned fuel through the main Valve.
supports the >pilot burner I2.
The member 40
likewise has secured thereto an inner member 43
formed of metal of substantially the same coefli- .
cient of expansion as the outer member 40, the
two members being secured together at’44 by over
lapping ears >spot-.welded together and secured
' Fig. -1l is a vdiagrammatic View of ' one type of
at 45 by` similar ears on the member 40 that> over..
the control employing arbucking coilzprinciple
lie` wings 45 extending towards the sides of the
therein;
pilot burner >in the lateral limits'of the member
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Fig. 2 is a rdiagrammatic `view of a modification
of' Fig. 1;
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43. _ A tongue 4l projects from the lower'part of
the member 43 toward the pilot burner to form a
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-, Fig. 3 is a modification' thereof wherein a re
shield.
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` The ‘member 4I),Y at its upper end, holds an actu
sistance combination is used;
> _Fig.'4 is a view of the‘ñame-switch preferably 50 ating blade 48 that’ extends downwardly tothe
used herein; and
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bottom part of the member 40, where it has 'an l
Fig. 5 is a section on the line 5-5 of Fig. 4.
insulated actuating button 43`that may be moved
Referring to Fig. l, the mechanism includes
over to close the switch blade -5IlV against fthe
broadly an external control, here shown as a room
thermostat I Il.
It includes also `a main burner 55
switch blade 5I.
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This ñame actuated switch is adapted to receive
2,407,438
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the pilot flame against the member 43, confined
extends from the other end of the coil 36 to
between the wings 46,
the other transformer lead 13.
When flame is applied
thereto, the member 43 expands rapidly, increas
ing in length between the spot-welds 44 and 45.
The outer member 46, within the corresponding
length between the welds 44 and 45, receives heat
only indirectly from the pilot name,v primarily by
From the line 1_6, there also leads a line 8B
into the switch 65. From this switch, a line 8i
leads into the coil 21, operating the valve 25 and
the switch 6I. From the coil 21, the line 83
conduction through the small welded ears.
tact 5I of the flame switch. The contact 50
thereof is connected by a line 9E! to the trans
former lead 19. Thus the foregoing main valve
operating circuit is directly across the secondary
of the transformer in parallel with the room
As a
result, the length between the welds of the outer
member 40 expands less rapidly than the corre
sponding part of the inner member and does not
attain the temperature of the inner member so
long as heat is applied to the inner member in
leads to a line 84.
The line 34 leads to the con
thermostat previously mentioned, but subject
the relatively unlimited quantity represented by
the pilot flame. Consequently, both will expand,
to controlby the room thermostat through the
switch 65.
An additional circuit is provided in parallel
but the inner will always be longer when the pilot
with the coil 21 in the last described circuit. It
flame is applied to it. Conversely, when the.> pilot
comprises a line 93 connected to the lead 10,
flame is extinguished, the two members rapidly
leading to a bucking coil 66, from which a line 94
equalize in temperature and assume their relative
20 leads into the line 84.
starting positions.
A lower Voltage line 95 leads from an inner
Thus, upon rapid temperature change applied
point of the secondary of the transformer to the
to the inner member, as when the pilot flame
switch 64. From this switch, a line 36 leads to
comes on, the inner member 43 will expand ra
the igniter i3. From the igniter, a line 91 leads
pidly relative to the outer, and warp the upper
to the switch 6I, from which a line 98 connects
end of the device outwardly. As the blade 48
into the return lead 19 of the transformer.
is rigidly secured to the upper part of the outer
member 46, the lower end of this blade, through
Operation
the button 49, will act to close the contacts 5U
The manual switch 12 is closed during any
and 5I. And when the pilot flame goes off, the
two members willv rapidly equalize in tempera 30 period in which the system is to be used. The
limit switch >16 will normally be closed. At the
ture, and when the temperature differential is
start, the room thermostat switch 14 is open,
below the operating differential, the switchwill
the burner II and pilot I2 are off, the flame
reopen.
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switch I4 is open, the switch 6I is closed, and
It will be seen that changes in ambient tem
perature will not change the position assumed by . the switches 64 and 65 are open.
When the room thermostat Ill closes its switch
this switch in response to the condition of the
14 a circuit from the lead 'I3 of the transformer
pilot flame, because ambient conditions expand
is closed through the line 1 I, the room thermostat
or contract the distance between the welds on
II) and its switch 14, the line 11, the main coil 36
both inner and outer members in a similar
amount. Although the changes in ambient tem 40 of the pilot valve I6, the line 18, the lead 19, back
into the transformer. Thereupon the coil 36,
perature affect the amount of the differential in
being energized, lifts its armature, causing the
temperature to a small degree, they do not affect
rod 33 to lift the ball valve 3€! from its seat and
the existence of a substantial differential of a
admit gas from the supply line» 20 through the
quantity to operate the switch. Hence the de
vice operates in response strictly to pilot ñame 45 pilot line 22', past the valve, and by the line 23
to the pilot burner I2.
conditions, Vregardless of the starting tempera
' Energizing the coil 36 also closes the switches
tures of the two members 4B and 43 resulting
64 and 65. The closing of the switch 64 closes
from any changes in ambient temperature, and
a circuit from the inner tapped line 95 of the
regardless of'changes in ambient temperature
during main burner operation.
50 transformer through the aforesaid switch 64, the
line 96, to the igniter i3, and thence by the line 91
The foregoing switch is in principle the same
through the now closed switch 6I, by the line S8
as that disclosed in the patent of James A. Rod~
to the return lead 1S to the transformer. The
gers, 2,392,065, issued January l, 1946.
igniter I3 will then glow and ignite the pilot ñame
A relay switch 6I is provided for joint opera
55 Vof the pilot burner I2. This flame will then act
tion with the main valve 25 by thecoil 21.
upon the flame switch i4, expanding the inner
The coil 35 operates through the armature 35,
member 43 relative to the outer member 46, and
switches 64 and 65, these switches being for pur
warping
the blade 43 to close the contacts 50
poses to be described. The coil 36 also has as
sociated therewith a `bucking coil 66 wound to
and 5I.
This latter will occur only if the pilot
flame ignites and remains ignited. The closure
oppose the magnetic pull of the main coil 36, but 60 of these two contacts after such ignition of the
of lower power.
pilot burner completes a circuit through the
The connections are as follows: From the
other switch. 65r of the coil 36 as follows: From
transformer I-1, a lead 10 is joined with a line
the transformer lead 1U, aline 86 leads through
1I, that leads through a manual switch 12, to a 65 the switch 65, and by a line 8l into the coil 21
line 13, connected into the room thermostat I0.
of the main valve I5, and thence by a line 83 to
When this thermostat cools to a predetermined
the line 84 through the flame switch I4', and by
temperature, it closes a switch 14l connecting the
the line 96 back to the return lead 'I9 of the
line 15 to the line 13. The line 15 leads to a
transformer.
limit switch 16, which comprises one of the fa 70
Energizing of the coil 21 causes it to lift its
miliar thermal devices for opening the circuit
armature, opening _the valve 25 to admit fuel
when the heat transfer medium does not remove
to the main burner Il, which is ignited by the
heat suñiciently rapidly to keep the furnace at a
pilot burner I2. The coil 21 also opens the
safe temperature. From the limit switch 16, the
switch 6I' to break the circuit to the igniter I3
line 11 leads to the relay coil 36. The line 18 75 and to deenergize the same.
2,407,438
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coil-66 isener'gized‘a's follows: The lead' 10, the
lineV 93, the bucking coil 66, 'the'line 94, tothe line
84, and thence through the flame switch and>
back -to the transformer.
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igniter I3, and, Ain short, to produce a complete
recycling from the starting condition.
i Also when the name switch closes, the bucking
K Were- it not fory the coil 66 or its equivalent, an
instantaneous failure ofthe principal circuits, re
sulting in at least momentary closing ofthe ,
The bucking coil is of
insufficient strength to f overcome the holding
valves, might be accompanied by a failure of flame
force of the main coil 36, 'but is of sumcient force
at Zboth burners followed by an immediate re-`
opening of both valves with lthe igniter I3 in an
open circuit. Thus, when the power fails, the
When thus started, the burner II will operate 10 armature 35 drops outand the switches 64 and
65 open. Resumption of power before the switch
for a running period. The pilot burner will like
I4 cools, and without the coil 66 in operation,
wise Vburn during this period. Thereafter, when
would close the switch 65, open the valve 25 and
the room thermostat I0 is 'heated by the heat
break the igniter circuit at 6 I. Thereafter, when
from the burner, it will break the contacts of the
the contacts'50 and 5IÍ open upon the cooling of
1 switch 14, which will open the circuit through
the switch I 4, the coil 21 is deenergized, the valve
the relay coil 36. The pilot valve will close in-`
25 isA closed and the igniter I3 is madeA operative
stantly under "the influence of the'spring 32, and
by the vclosing of the switch 6I. The igniter cir
the switches 64 and ,'65 will open. Opening of
cuit'is thus completed after a substantial amount
the .switchY 64 gives an additional break to the
to prevent the main coil from moving its arma
ture.
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of unburned gas had been delivered by the main Y
« circuit t'o the igniter, which, during the running
, of the switch 65 breaks the circuit to the main
burner to the furnace, which action could easily
causev an explosion even though the main burner
valve :coil 2l, so that the main valve 25 imme
had been shut off before the ignition carne on.
period, is aiready open at the switch 6 I;
Opening
If the' pilot isf extinguishedfduring operation,
and is notv relit by the main burner llame, this
will normally result in opening of the"contacts
56 and 5l of the flame switch, followed immedi
time, since it is now open at the switch 64. With
ately by closing of the main valve 26 and closing
both the main and the pilot valve closed, the
of the switch 6I, so that the igniter I3 may again
main and pilot burners Il and I2 stop operating,
and the ñame switch I4 cools. With the type of 30 be put in the circuit for re-ignition. If fuel
pressure falls substantially, the pilot flame will
flame> switch shown, and which is preferred, this
not Ygenerate sufficient heat to maintainV the
openingof the contacts 50 and'5l will occur with
diately closes, and the switch 6Iv also recloses.
However, as noted, the closure of the switch 6I
does not close the circuit to the igniter'at this
switch I4 closed, and the main valve 25 will close
in a few seconds after the pilot burner goes out,
due to the opening ofthe circuit to the coil 2'I. '
as this control responds immediately to an abrupt
change of temperature on the inner member 43, 35 If there is a failure of the igniter or of pilot
ignition at the start o-f a cycle, the main burner
valve 25 will not open and theescaped gas will
be only in the limited volume running through
regardless of the ambient temperature applying
equally
to both members.
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As noted, the bucking coil 66 opposes the main
, the pilotline.4
coil 36, but is of insufficient power to'cause a re
If the room thermostat remains, closed, either
lease of the armature.V -Since itis of sufficient
power to prevent the armature from being pulled
in when both coils are energized, any instanta
neous break of the principal circuits, such as by
by failure or otherwise, so that the burner attains
an excessive temperature, the limit switch 'I6 will
be 'opened inV conventional Ffashion. This will
bre'alïthe-circuit to the coil 36, resulting in clo
vibration of the room thermostat ‘contacts or an
instantaneous power failure either of which are `-, sure of the ~main and pilot Valves, which will re
main in circuit until the contacts 50 and 5I are
of insufficient duration to vpermit the" flame
opened. Thereafter the control will be required
switch contacts to open, will, nevertheless, result
to recycle completely upon any reclosure of the »
in aY complete recycling of the control. This oc
limit switch.
curs because any such ,action deenergizes the
¿If the flame switch I4 failsin hot position, the
main coil 3B and its armature falls out.` If this _.3
.control will operate to complete the cycle started,
break of the circuit of the main coil 36 occurs by
jiggling of the thermostat, the coil 66 will remain
in circuit and will act to open the switches 64~ and
65 and close the pilot valve`30. If, however, the
main coil 36 is deenergized because lof a momen
tary power failure,§the, armaturewill fall, and
but afterï the `cycle ends a new one cannot be'
' instituted because the bucking coil 66'is energized
whenever the contacts 50 and 5I are closed.
_ Obviously, too, if the flame switch fails in open
position, the main burner valve can never open.
These two failures are controlled inthe forego
ing manner, regardless of an additional failure
upon restoration of power the coils 36 and 66 willV
become simultaneously energized providingY the
contacts 50 and 5I remain closed. Insuch case,
the coil 66 is energized at the same time the coil
36 becomes reenergized, and, although the alge
braio sum of the forces produced by the opposed
coils will hold the armature 35 up once it is
raised, this force is not ygreat enough 'to pull the
armature up from its lower position.
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Thus, with the armatureofthe coil 36 down,
the pilot valve is closed and the circuit to the
mainv valve coil 2'I is broken through the switch
65. Therefore, the main valve closes upon such
instantaneous circuit failure, and it is prevented
from reopeninguntilthe switch »I4 coolsand'th'e
“bucking” effect of the coil 66 is destroyed by the
opening -of the contacts 50 and 5I, whereupon
the coil 36 is effective again to close the 'switches
64 and 65,’toopen the pilot vvalve 30, to 'start the
of the room thermostat.
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MOdifi'CatiO'n 0f Fig. 2
` VIn Fig. 2 is shown a modification wherein'the
valvesare operated byseparate coils fromtheir
associated switches.
Each switch coil is Icon
nected in parallel with its related valve coil. '
The mainI switch relay (31a) coils are shown
at 36a and 66a, the coil 66a Ibeing wound oppo
sitely from the _coil 36a. These coils operate the
switches 64 and 65, as before, and an additional
switch63. The pilot valve ycoil is at 3617,'. con
nected in parallel with the coil 36a, but dependent
upon the newly added switch 63 controlled by the
@ou sea.
The main valve switch coil is at 21a, and the
iïiain valve operating coil it at 2lb.` These two
2,407,438
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coils are directly in parallel for simultaneous
energization, whereby‘the valve 26 and the switch
Si; will .he openedA simultaneously.
mostat. The line from the resistor RI' into the
coil 3621s designated 11o. From the line 11o, a
line 1165' leads through a resistor R2 to the line 84.
>It will be seen that: the transformer leads 10,
When the room thermostat l0 closes, the same
IS; and 95 remain as before, as do the leads 84
E@ to the name switch. The line 11 from the
thermostat lil branches into a line 11a leading
tothe coil 35a, and into a line 11b leading to the
coil 35o, by way of a switch 63.
circuit from the line 10 through the line 1l, the
room thermostat l0, the line 11, the resistor Rl,
the line 11o, the coil 36, the line 18 and the line
19' is effected. This closes the switches 64' and
55 as heretofore. When the switch 64 closes, the
' When the room thermostat I 0 closes', `current 10 igniter i3 is energized because the switch 6|,
hows from the transformer lead 'lll through the
line 1l, the thermostat l0 and the line 11. In
this modification, the line 11 branches into a line
11o and a line 11b. The current flows through
the line 11a, and thence through the coi-l 36a,
whence it íiows by a line 18av to the other trans
former leadv 13. Thus the coil 36a is put in cir
cuit as soon as the roomV thermostatV closes, in the
same manner as before.
It then closes the three
switches 63, S4, and 55. When the switch 63 is
operated by the main valve coil' 21, is closed.
The pilot valve 30 is open and the pilot flame
ignites, whereupon the flame switch I4 closes the
contacts 5i) and 5f. This closes the circuit from
the line 1G through the line 80, the switch 65, the
line 8i, the coil 21, the line 83, the line 84, the
switch I4, the line 90, and the lead 19, whereupon
the main valve 21 is opened and the switch 6I is
also opened to cut the igniter I3 out. Thus the
out out of the igniter and the opening of the main
valve are, as before, dependent upon the exist
closed, it closes a circuit from the line 11 through
a line 11b to the coil 36h, and thence back to the
ence of a pilot name.
transformer lead 19. This puts the coil 36h for
At the same time this last circuit is closed,
operating the pilot valve’3llv in parallel with the
the parallel circuit from the line 11o, through
coil 35a but under control of the switch 63 of the 25 the line HB5 and the resistor R2, is closed by way
latter coil.
of the line 84, the switch I4 and the line 9i). The
When the switch 64~ closes, it establishes the
resistor R2 introduces a circuit drawing current
ignition circuit through the line 95 as ibefore, and
in parallel with the coil 36. This current in
the line 91 and the closed switch 8|, and the line
creases the voltage drop across the resistor R!
98: back to the transformer lead 19. As the coil 30 (which resistor may comprise in whole or in part
'21aV is then out of circuit, as was the fcoil 21 at a
the inherent resistance in the circuit). The in
corresponding time in the4 other illustration, the
creased voltage drop across the resistor Rl re
igniter will become operative. Thus the pilot
duces the voltage available to the coil 35, so that
burner may lbecome ignited.
its current drop and its magnetic pull is low
When the switch 65 closes, the line 8l is con 35 ered. The reduction in magnetic pull is insuffi
nected'with the transformer lead 10, and this line
cient to cause the coil to drop its switches open,
through its connections Bla and 8lb leads to the
but is sufficient to preventl the coil from pulling
two coils 21a‘and 21h, and thence by the two
the switches from an open position.
leads 83o and 83h. These two parallel leads
In this circuit, it will be seen that the same
merge in the line 83, which is connected with the 4.0 results as in Fig. l' attain, except that the paral
lines 94 and St as before. Thus the two Icoils 21a
lel voltage reducing circuit Vis open whenever
and 2lb are directly in parallel and operate in
the room thermostat opens. It acts to prevent
unison whenever the switch 55 is closed and the
the main Valve from returning to open position
name switch also is closed, the two operating in
upon break in current through the coil 35 until
the same mannerfas the single coil 21 in the " the llame safety switch I4 has cooled.
earlier illustration. l
It will be understood that the control may be
The bucking coil 66a is connected directly
employed with other controlling elements, such
across the transformer leads and through the
as diaphragm valves, in which case the-partic
flame switch as before. Its operation is the same
ular Valves illustrated become relay or pilot valves
as before, but the third switch 63 is employed so
controlling the bleed lines of the familiar di
that when the bucking coil is effective it not only
aphragm type valves.
breaks the circuits through the switches 64 and.
For use with D; C., the system may beY modi
G5, controlling the main valve and igniter, but
fied', as by employing voltage dividers of conven
also is eiîective through the switch B3 to open the
tional types, in which case, the bucking coil has
circuit to the pilot valve coil 36h and insure clos
the advantage of opposing the lifting of the ar
ing of that valve.
mature, as well as diminishing the force of the
It will further ‘be evident that the choice of
main coil.
one or two coils, either for the pilot valve control
In some installations, it may be desirable to
or for the main Valve control, does not affect the
use a separate transformer for the igniter in
overall operation of the mechanism where the
stead of a center» tap on the main transformer.
connections are made as shown in Figs. 1 and 2.
In such case the primary of the second trans
Sometimes, for mechanical reasons such as effi
formerv could be energized in parallel iwith the
ciency of manufacture or the desire for separat
circuit including the coil 21 and flame ‘switch
ing the switch operation or control from the valve
i4, and the primary circuit would include- the
operation or controls, it may be desirable to use
switch 6|. Obviously this would eliminate one
separate coils to actuate one or more of the valves
switch 64 of the relay 31, as the voltage into the
and switches.
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switch '6| and the primary would be the same
Modification of Fig. 3
as that through the switch 65, permitting inter
connection of the circuits.
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What is claimedr is:
In Fig. 3, there is shown a control that accom 70
1. In a control for use with a main burner, a
plishes the same objective but uses a resistor in
stead of the bucking coil 66. In this arrange
pilot burner, and a main control device includ
ment, the parts are the same except for this sub
ing a power element, electrical means operat
stitution. It comprises the introduction of a ñrst
edy through the main control to supply fuel to
resistor Rl in the line 11 leading from the ther 7 the main burner, a flame-responsive> switch op
anos-188
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6. In a control for Vuse with a main burner, a
erated by >combustion at ,the pilot burner, and
pilot burner, and a main control device including
means controlled by vsaid flame-responsive switch
a relay and coil, a flame-responsive switch oper
ated upon existence of combustion at the pilot
` for reducing the power of said element to'render
.the same effective to hold said control device in a
burner, pilot fuel supply means operated by said
closed position once,- this position is attained, but
maincontrol device, flrstineans responsive to op
ineffective to move ksaid device from an opento
eration of said relay to effect ignition of the pilot
burnery said means including mechanism concur
rently ’operated to control actuation of the main
pilot burner, Vand a main control device, a flame
responsive switch operated upon existence oi" 10 burner, said mechanism ,being also dependent
upon operation of the pilot llame switch, and
combustion at the pilotburner, an electrical fuel
safety means operated upon closing ofthe pilot
supply means energizable to operate the main
flame switch Vto render said relay incapable of
burner, means `responsive to operation of the
shifting said first means from an inoperativepto
main control device to cause operation of the
a closed position.
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2. In a control for use with a main burner, a
pilot burner, means »operated in response to op 15 an operative position when the ñame switch is in
a closed position, said ñrst means comprising a
eration of the pilot flame switch to energize the
switch device and said safety means comprising-a
main burner fuel supply means, and means op
bucking coil producting a magnetic force in op
erated in response to operation of the pilot vilaine
position to that of the relay coil.
switch to prevent reoperation of the main burner
7. In a control for use with a main burner, a
fuel supply Vmeans when the llame-responsive 20
pilot burner, and a main control device includ
switch is in operative position.
.
ing a relay, a name-responsive switch operated
3. In a control for use with a `main burner, a
Yupon existence of combustion at the pilot burner,
pilot burner, andîa k‘main control device, a ñamc
pilot fuel supply means operated by said main
responsive switch operated upon existence of
combustion at the pilot burner, ñrst means re 25 control device, first means responsive to opera
tion of said relay to effect ignition of the pilot
sponsive to operation of the main control de
burner, said means including mechanism con
vice to effect operation of the pilot burner, said
currently operated to control actuation of the
means including mechanism concurrently oper
main burner, said mechanism being also depend
ated to control actuation of the main burner,
said mechanism being also dependent upon op 30 ent upon operation of the pilot fiame switch, and
safety means operated upon closing of the pilot
eration of the flame-responsive switch, and safety
flame switch to render said relay incapable of
means operated upon closing of the pilot flame
shifting said flrst means from an inoperative to
switch to render the first means incapable of
shifting from inoperative to operative position
an operative position when the flame switch is in
when the iiame switch is in operative position.
a closed position, said first means comprising a,
relay switching device and said safety meansin
4. In a control for use with a main burner, a
cluding a current reducing device to lower the
current through a coil of said relay.
Vpilot burner, and a main control device having
a power element, a name-responsive switch op
8. In a control -for use with a main burner, a
erated upon existence of combustion at the pilot>
burner, pilot fuel supply means operated by said 40 pilot burner, and a main control device including
main control device, first means responsive to op- f
a relay, a name-responsive switch operated upon
eration of the main control device to effect igni
tion of the pilot burner, said means including
mechanism concurrently operated to control ac
tuation of the main burner, said mechanism being
also dependent upon operation of the pilot name
switch, and safety means operated upon closing
of the pilot flame switch to render the iirst
existence of combustion at the pilot burner, pilot
fuel supply means operated by said main control
device iirst means responsive to operation of said
relay to effect ignition of the pilot burner, said
means including mechanism concurrently oper
ated to control actuation of the main burner,
said mechanism being also dependent upon op
eration of the pilot flame switch, and safety
means operated upon closing of the pilot ilame
switch to render said relay incapable of shifting
means incapable of shifting from inoperative to
operative position when the iiame switch is in ,
closed position, said safety means comprising a
power reducing means adapted to reduce the
power of said element below that required to op
said ñrst means from an inoperative to an op
erate the iirst means from an open to a closed
erative position when the flame switch is in a
closed position, said first means comprising a
position, but not less than that required to hold
switching device and said safety means including
the first means in a closed position once this po
sition is attained.
5. In s, control for use with a main burner, a
relay.
pilot burner, and a main control device including
a relay, a, flame-responsive switch operated upon
existence of combustion at the pilot burner, pilot
fuel supply means operated 4by said main control
device, ñrst means responsive to operation of said
relay to effect ignition of the pilot burner, said
means including mechanism concurrently oper
ated to control actuation ofthe main burner,
said mechanism being also dependent upon op-
eration of the pilot llame switch, and safety means
operated upon closing of the pilot name switch to
render said relay incapable of shifting said ñrst
means from an inoperative to an operative posi
tion when the flame switch is closed, said first
a resistance to reduce the current through the
.
9. In a control for use with a main burner, a
pilot burner, a pilot igniter and a main control
GO device, a ñrst means .to admit fuel to the pilot
burner »upon operation of the main control device,
said means being also adapted to operate the '
pilot igniter, second means including a device
operated to actuating position upon existence of
combustion at the pilot burner and .the ñrst
means to admit fuel to «the main burner, said
~ second means being also adapted to render the
igniterinoper-ative, said combustion device being
operable in response to combustion or combustion
70 failure at the pilot regardless `of ambient tem
perature variations, and said device, upon failure
of pilot combustion, being adapted to render .the
second means inoperative.
means comprising a/switch device, and said safety
10. In a control for use with a main burner, a
means comprising an relectrical device to reduce
the magnetic p_ull of said relay.
75 pilot burner, a pilot igniter and a main control
1i
l2
device, first means to Yadmit fuel to the pilot
burner upon operation of the main control de
vice, said means being also adapted to operate
the pilot igniter, second means including a device
operated -to actuating position> upon existence of
combustion at the pilot burner and the ñrst
»coil capable of actuating said device "to burner
means to admit fuel to the main burner, said
second means being also Aadapted to render the
to said position, the main coil being adapted to
be energized and to operate the actuated device
to provide burner operation when the space ther
mosta-t demands heat, a combustion-responsive
switch movable to a combustion-indicating .posi
tion when combustion exists at the burner, the
bucking coil being connected with the combus
tion-responsive switch to be energized When the
igniter inoperative, said combustion device being
operable in response to combustion or combustion
failure at the pilot regardless of ambient tem
perature variations, and said device, upon failure
of pilot combustion, being adapted to render the
second means inoperative, means to effect shut
operating' position, and a buckingrcoil'operatively
vassociated with the ïmain coil and adapted, when
both coils are energized, to reduce the power of
the relay to a value suii‘icient to holdthe device
in operating position, but incapable of pulling it
off of the lmain burner fuel supply means upon \ ,l same moves into combustion-indicating position
current break in itscircuit, and means to `prevent
reoperation of the Ymain burner fuel supply means
until the pilot -flame device has returned to in
operative position.
v
«11. In a control devicefor "use with a burner or
the like, under control of a room thermostat, the
4combination of a relay having an actuated device
for controlling operation of the burner, a main
in response to existence of combustion at the
burner, whereby when said thermostat demands
heat and the combustion-responsive switch is in
combustion-indicating rposition the relay can hold
the actuated device., but cannot pull the same to
operating position.
ERIC P. NEWMAN.
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