S T E P 1 - AO Smith Water Heaters

LEGEND HEATERS
SERVICE WORKBOOK
BLOWER TEST
LEGEND HEATERS
SERVICE WORKBOOK
RELAY 3R (24 VAC SPDT) CHECK
TERMINAL 2
Dia Scan-Interface
o o o o o o
o
X
o o o o o
(1R)
X
X
1 2
3 4
X
X
0 1
2 4 6 8
X X X X
0
X
1 2
3 4
5 6
5 6
X
X
7 8
7 8
X
X
0
(2R)
10A
(3R)
X
X
X
0
YELLOW
0
2A
1
2
3
4
5
6
X
X
X
7
8
9
10
11
12
X
TERMINAL 3
X
10
RAM HSI Control
LW/LB - 1000
9 8 7 6 5 4 3 2 1
1. Inducer
2. Ignitor - 1
3. 120V - Hot
4. 120V - RTN
5. Ignitor - 2
6. Ground
7. Valve
8. Pressure SW
9. Thermostat
10. 24 Vac Hot
X
Dia Scan-Interface
o o o o o o
X
o
X
o o o o o X
(1R) X
X
X
0 1
X
2 4 6 8
X X X X
0
0
X
X
1 2
3 4
5 6
7
X 8
BLACK
1 2
3 4
5 6
7 X 8
X
X
(2R) 0 (3R) 0
10A
2A
TERMINAL 5
GROUND
Ref: Page 58 Wiring Diagram
1
2
3
4
5
6
X
X
X
7
8
9
10
11
12
X
X
10
RAM HSI Control
LW/LB - 1000
9 8 7 6 5 4 3 2 1
1. Inducer
2. Ignitor - 1
3. 120V - Hot
4. 120V - RTN
5. Ignitor - 2
6. Ground
7. Valve
8. Pressure SW
9. Thermostat
10. 24 Vac Hot
X
S
T
E
P
RESULTS
15
Blower Test
Blower should be running at full RPM
If the:
then
blower is not operating • check blower wiring to 2R
terminal 2 and white wire to
terminal 3 of upper terminal
strip.
• replace blower.
blower is operating correctly go to Step 16.
During 20 Second Proving Period
Ignitor Is Heating
S
T
E
P
25a
LW/LB
1000
RESULTS
Relay 3R (24 VAC SPDT) Check
Test for 120 VAC 3R relay terminal 5 to ground.
If the meter:
then
does not read 120 VAC
check wiring to HSI control
terminal 2.
does read 120 VAC go to Step 25b.
A.O. Smith Water Products Co.
Irving, Texas © 1997
34
Service Workbook
Training Department
A.O. Smith Water Products Co.
Irving, Texas © 1997
47
Service Workbook
Training Department