Louisville Tin and Stove HEDV254A - Manual (Page 13)

Page 13

Pressure switch closes proving
inducer
Heater
in
stand-
by
Thermostat
calls for
heat
Power on to draft
inducer
Pressure
switch closes inducer proved
Spark ignition
ener
gized
Gas valve opens
gas
flow to burner
Burner flame proved
Blower
on
Heat cycle
Thermostat
satisfied










Gas valve closes
gas flow to burners
of
f
Draft
inducer
of
f
Blower
of
f
Heater
in
stand-
by
 
Inducer
continues to
run

One Hour Lock Out

15 Sec.
inter purg
e
3
Attempts
for ignition




30 Sec.
180 Sec.
90 Sec.
4 Sec.
NO
NO
YES
YES
NO
NO
YES
YES
STEP # 1)
Thermostat calls for heat.
2)
Draft Inducer turns on.
3)
Pressure switch closes.
4)
Spark ignition begins.
5)
Gas flow to burner
.
6)
Burner ignition proven.
7)
Circulating Blower on.
8)
Heater burns through heating cycle.
9)
Thermostat satisfied.
10)
Gas flow of
f to burner
.
1
1
)
Draft inducer of
f.
12)
Circulating Blowers of
f.
13)
Heater in stand-by
.
NOTE: IF
THERE IS
A
MALFUNCTION IN STEPS 3, 5, 6
THE OPERA
TION SEQUENCE
WILL
ST
O
P
A
T
THA
T
POINT
. FOR STEPS 5 OR 6, IF
AFTER 2
ADDITIONAL
A
TTEMPTS MALFUNCTION STILL
OCCURS,
THE
CONTROL
WILL
LOCK OUT
FOR ONE HOUR. FOR PURPOSE OF
TESTING
,
THE ONE HOUR LOCKOUT
CAN
BE OVERRIDDEN BY
RESETTING
THE
THERMOST
A
T
OR INTERRUPTING
THE ELECTRICAL
POWER.
HEDV
SEQUENCE OF OPERA
TION