A.O. Smith T-D2-OS User Manual

T-D2-IN / T-D2-OS Service Manual
Ver. 1.00
33
CONFIDENTIAL
10-17. Igniter
Unit Part # #711 Takagi Part # EKN74 Checkpoint B
Function
-To ignite the gas/air mixtures when the water heater is ready to burn gas on
its burner surface.
-The output voltage of the igniter is more than 14 kVDC.
Failure events
1. Unable to ignite during the ignition process.
2. Makes attempts to ignite at all times.
Effects on the water
heater if the igniter fails
1. The water heater cannot ignite during the ignition process and the "111”
or “121” error codes will display.
2. No effects on the water heater, however, the durability of the igniter
wears down.
Error codes when Igniter
fails
111 121
Diagnostic
1. Visual inspection: connection/breakage of wires and/or an observed weak
spark.
2. Check voltages: proper range of values shown below.
Color/Number of wires Purple(7)-Purple(7) 90 to 110 VAC
Power supply
AC 90 to 110V
To High valtage
ignite cable
High-voltage igniter cable
90 to 110 VAC
Igniter
14 kVDC
1-3/4" (44mm)
3/4" (20mm)
1-1/2" (38mm)
Purple wire
The high-voltage
igniter cable and
the purple wires
do not come
with EKN74.

A.O. Smith T-D2-OS Specifications

General

Brand	A.O. Smith
Model	T-D2-OS
Category	Water Heater
Language	English