Eco check (continued), 24 v, 24 vac from eco – A.O. Smith 960 through 967 User Manual
Page 23: Steps
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B T H S E R V I C E H A N D B O O K
T R O U B L E S H O O T I N G
ECO CHECK (CONTINUED)
STEPS
24 VAC FROM ECO
Ì
24 V
.Temperature/
Eco Probe (Upper)
Temperature
1
2
», Probe #2 (Lower)
2 I-
IcN4 .^ ^ ^
' Í ^
. [ *
TCN2 1 2 3
Igniter
Transformer
— Blower
■ 1 O *5
CN1 HtnwISKflp^
—To Junction Box
I
I
1, 3 Gas Valve
2 Flame Sensor
6 5 4
• 4, 6 Pressure Switches
5 Ground
STEP 5: CHECK FOR 24 VAC BETWEEN PIN 1 ON CN3 PLUG AND GROUND.
Condition:
• Reconnect CN3 plug to control board.
• On/Off switch is on.
Insert one meter probe into the back of CN3 plug pin 1, check for 24 VAC between here and ground
with CN3 plugged in and power on. (See illustration above for pin number locations.)
IF...
THEN
24 VAC is not present
make sure water temperature in tank is below 160° F, press Set/Reset button on
display panel, replace upper temperature/ECO probe if tank water temperature is
below 160 and Step 4 has been performed and results were successful.
24 VAC is present
continue to Step 6.
Technical Training Department
TC-044 Revision 6
22
A. O. Smith Water Products Co.
Ashland City, Tennessee © 2004