S T E P 1 - AO Smith Water Heaters

LEGEND HEATERS
SERVICE WORKBOOK
2R RELAY TEST – SUPPLY POWER
LEGEND HEATERS
SERVICE WORKBOOK
2R RELAY (120V SPDT) TERMINAL 4 CHECK
Ref. Wiring Diagrams Pages 57 and 58.
S
T
E
P
Test of 2R (120V SPDT) Relay (Located in junction box
with Rheostat on 500 and 750 model heaters. Located
in the large electrical box on the 1000 models.)
13 Test for 120 VAC from Terminal 6 to Ground.
TERMINAL 4
GROUND
During 20 Second Proving Period
Ignitor is Heating-Blower is at Slow Speed
S
T
E
P
25c
LW/LB
1000
only
o o o o o o
o
X
o o o o o
(1R)
X
X
1 2
3 4
5 6
7
X 8
X
(2R)
Dia Scan-Interface
X
X
0 1
2 4 6 8
X X X X
0
0
10A
X
1 2
3 4
5 6
7 X 8
X
(3R)
X
X
X
0
YELLOW
0
2A
2R Relay (120V SPDT) Terminal 4 Check
1
2
3
4
5
6
X
X
X
X
7
8
9
10
11
12
Test for 120 VAC between 2R (120V SPDT) relay terminal 4 and
ground.
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
RESULTS
If the meter:
then
does not read 120 VAC
check wire connections
between terminal 6 on 1R
relay and terminal 6 on 2R
relay.
does read 120 VAC go to Step 14.
RESULTS
If the: and then
blower does not read 120 VAC the wiring replace the 2R relay.
does read 120 VAC
connection from
the blower red
wire to 2R relay
term 4 is correct go to Step 25d.
A.O. Smith Water Products Co.
Irving, Texas © 1997
32
Service Workbook
Training Department
A.O. Smith Water Products Co.
Irving, Texas © 1997
49
Service Workbook
Training Department