SEQUENCE OF
OPERATION
-
HSG
SERIES
POWER GAS CONVERSION
BURNER
UTILIZING
HONEYWELL S89E GAS
PRIMARY P/N 62758.002
W/ EXTERNAL
30 SECOND
PREPURGE TIMER
P/N
62388-001
AND RESISTOR P/N 62530-001
On
a call
for heat, voltage
(24V)
is applied to the motor
start
relay and air
switch.
The
motor
relay
pulls
in
the
motor. After the motor reaches speed, the combustion
air blower closes
the air
proving
switch
contacts,
energizing the external30 second
prepurge
timer.
After
the 30 second
prepurge
timing, the S89E is energized.
The
S89E
gas primary
control has an internal 8 second
safe start check.
After the initial 30 second
prepurge
provided
by
the
external
timer, the
S89E
gas
primary
control
is
energized,
the
I second safe
start check
will
commence. Once
this is accomplished, the S89E
activates the
gas
valve
allowing
gas
to
flow
to
the burner
head.
Simultaneously,
the S89E control energizes
the
ignition
transformer,
producing
an approximate
7300
volt
spark
end
point grounded
at
the
burner
head,
establishing
main
burner
flame.
At the start of each
heat
cycle,
there is a trial for ignition
period
of four
(4)
seconds duration.
Normally,
burner
flame will be established before the end of
this
period.
Once the
flame is
established, sparking
will cease and
the flame rod will
provide
flame monitoring to the S89E
gas primary
control
for
the
remainder
of the
heat cycle.
When utilizing the S89E
gas
primary
control
with the
eternal
30 second
prepurge
timer, a 10K ohm
resistor is
wired in
parallel
between the outout terminal of the 30
second
prepurge
timer
and
the input terminal to the
S89E
gas primary
control. The
function
of this
resistor
is
to
keep a load on the output terminal of the external
30
second
prepurge
timer, after
the initial
call
for heat
and
30 second
start
prepurge
and 8 second safe
start
check.
This
promotes
simultaneous
re-ignition
of the
main
burner
flame after the S89E's 8 second safe start check,
overriding the 30 second
prepurge.
This
is
desirable
in
oven or similar
applications where temperatures cannot
vary
drastically.
Should
the flame be extinguished during the
heat
cycle,
the
S89E
primary
ignition
control
will
go
into the I
second safe staft
check after which time
it will re-
energize
the
gas
valve and
ignition
transformer
in
an
attemot to
re-establish
the
main burner flame. lf this
does
not
occur
within the 4
second
trial for
ignition
period,
the S89E
gas primary
control
will
go
into lockout
de-energizing the
gas
valve
and
ignition transformer. To
restart the system, the
main
power
or thermostat must
be de-energized
momentarily, then
re-energized. lf
at
any time during
the heat cycle, there is insufficient
supply of combustion
air to the burner, the air switch
contacts
will open,
putting
the system
into lockout
closing the
gas
valve.
AIR PREPURGE
SWITCH
TIMER
N
WIRE NUT
BURNER
CNO
HSG POWER GAS BURNER
WITH HONEYWELL
S89E GAS
PRIMARY
24VAC
YL---_-F-l
t{l
YL------lJl
REDUNOANT
GAS
VALVE
s-E9-E
IF ANY
OF THE ORIGINAL WIRE,
AS
SUPPL]ED W]TH THE APPLIANCE.
MUST
AE REPUCED,
IT
VUST
BE
REPLACEO WITH TYPE
AWM 1AGA
1O5'C
WIRE
OR EOUIVAL€NT.
z
e
LIMIT/
@
I i
THERMOSTAT
:24VAC
TRANS.
lScHEMATIcl
PAGE 10
SEQUENCE OF OPERATION - HSG SERIES
POWER GAS CONVERSION BURNER UTILIZING
HONEYWELL S89E GAS PRIMARY
PIN
62758-002 WI EXTERNAL
30 SECOND PREPURGE TIMER
PIN
62388-001 AND RESISTOR PIN 62530-001
On a call for heat, voltage (24V)
is
applied
to
the motor
start relay and air switch. The motor relay pulls
in
the
motor. After the motor reaches speed, the combustion
air blower closes the air proving switch contacts,
energizing the external 30 second prepurge timer. After
the 30 second prepurge timing, the S89E is energized.
The S89E gas primary control has
an
internal 8 second
safe start check. After the initial 30 second prepurge
provided by the external timer, the S89E gas primary
control is energized, the 8 second safe start check will
commence. Once this
is
accomplished, the S89E
activates the gas valve allowing gas to flow to the burner
head. Simultaneously, the S89E control energizes the
ignition transformer, producing an approximate 7300
volt spark end point grounded at the burner head,
establishing main burner flame.
At
the start of each heat cycle, there is a trial for ignition
period of four
(4)
seconds duration. Normally, burner
flame will be established before the end of this period.
Once the flame
is
established, sparking will cease and
the flame
rod
will provide flame monitoring
to
the S89E
gas primary control for the remainder of the heat cycle.
When utilizing the S89E gas primary control with the
eternal 30 second prepurge timer, a 10K ohm resistor is
wired
in
parallel between the output terminal of the 30
second prepurge timer and the input terminal to the
S89E gas primary control. The function of this resistor
is
to keep a load
on
the output terminal of the external
30 second prepurge timer, after the initial call for heat
and 30 second start prepurge and 8 second safe start
check.
This promotes simultaneous re-ignition of the main
burner flame after the S89E's 8 second safe start check,
overriding the 30 second prepurge. This is desirable
in
oven or similar applications where temperatures cannot
vary drastically.
Should the flame
be
extinguished during the heat cycle,
the S89E primary ignition control will go into the 8
second safe start check after which time it will re-
energize the gas valve and ignition transformer in
an
attempt
to
re-establish the main burner flame.
If
this
does not occur within the 4 second trial for ignition
period, the S89E gas primary control will go into lockout
de-energizing the gas valve and ignition transformer.
To
restart the system, the main power or thermostat must
be
de-energized momentarily, then re-energized. If at
any time during the heat cycle, there
is
insufficient
supply of combustion air
to
the burner, the air switch
contacts will open, putting the system into lockout
closing the gas valve.
HSG POWER GAS BURNER
WITH HONEYWELL S89E GAS PRIMARY
24VAC
REDUNDANT
GAS VALVE
24VAC TRANS.
L2
IGN.
TRANS.
S-89-E
S
E
MOTOR
N
FLAME
SENSOR
I
LADDER
I
RESISTOR
THERMOSTAT
L1
MOTOR
,..----.
: H
'
----,---=--=--=-----{
:
RELAY:
I I
I I
I I
I I
I I
I.,
.J
LIMIT
AIR
PRf,~~~GE
,..-
__
,/1/'1/1,
-----,
-1
SWITch
liMIY/
CONTROLLER
I
COIL,
f--f-{'
)-;'------------------i
PART
NO.
62488-003
S-89-E
24VAC
YL
------r=n
YL---UJ
REDUNDANT
GAS
VALVE
BLU
BRN
GRN
MOTO
VALVE
'---~VALVE
r-:7---+--~
24VAC SENS
24VAC
GND(24VAC)
8LK
~LAME
S~R
WHT
==i~====~
BlK
BLU
ICNlT10N
BURNER
GND
IGNITiON
ROO
L-~~~==.!8!l..!!\
K,-=~-"'------':~
IF
ANY
OF
THE
ORIGINAl
WIRE.
AS
SuPPLIED
WITH
THE
APPUANCE.
MUST
BE
REPLACED,
IT
t.4UST
BE
REPLACED
WITH
TYPE
AWM
18GA
lOS"
C
WIRE
OR
EQUIVAlENT.
/\
WIRE
NUT
AIR
PREPURGE
SWITCH
TIMER
~
RESISTOR
YL.-.""
I
\I
\ I \
~r-'
YL
24VAC
TRANS.
ISCHEMATlcl
'----'==--
....J
PAGE 10
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