SERVICING
24
measuring voltage between Pin 4 & 5 (black & white wire
on 5 pin connector.)
4. If voltage is present in Steps 1 through 3 and the induced
draft blower is operating, check for 120 volts to the ignitor
during the preheat cycle.
5. After the ignitor warmup time, begin checking for 24 volts
to the gas valve. Voltage will be present for seven seconds
only if proof of flame has been established.
WARNING
H
I
GH
V
OLTAG
E
D
IS
CONN
E
CT
ALL
PO
WER
B
E
FO
RE
SERVI
C
I
NG O
R
I
N
S
TALL
I
NG TH
IS
U
N
I
T.
M
U
LT
I
PL
E
PO
WER
S
O
UR
C
ES
M
AY
B
E
P
RESE
NT.
F
A
I
L
URE
TO DO
S
O
M
AY CA
USE
P
R
OP
ER
TY
DA
M
AG
E
, P
ERS
ONAL
I
N
JUR
Y O
R
D
E
ATH.
CHECKING FLAME SENSOR
1. Disconnect the yellow flame sensor wire from the sensor
2. Connect a micro-amp meter in series with this wire and
the sensor terminal.
3. Place the unit into a heating cycle.
L
I
N
E
V
OLTAG
E
NO
W
P
RESE
NT
WARNING
4. As soon as flame is established a micro-amp reading
should be evident once proof of flame (micro-amp
reading) is established, the hot surface ignitor will be de-
energized.
5. The Integrated Ignition controls will have 3-10 uAmps.
1-3 uAmps is considered low and will flash 1 amber light.
Anything below 1 uAmps and the unit will shut down. If
the micro-amp reading is less than the minimum specified,
check for high resistance wiring connections, sensor to
burner gap, dirty flame sensor, or poor grounding.
6. If absolutely no reading, check for continuity on all
components and if good - replace ignition control module.
NOTE:
Contaminated fuel or combustion air can create a
nearly invisible coating on the flame sensor. This coating
works as an insulator causing a loss in the flame sense signal.
If this situation occurs the flame sensor must be cleaned with
steel wool.
Содержание AMES960403BU AA
Страница 25: ...TROUBLESHOOTING 25...
Страница 26: ...TROUBLESHOOTING 26...
