A.O. Smith T-H2-DV User Manual

T-H2-DV/T-H2-OS Service Manual
Ver. 1.01
38
CONFIDENTIAL
10-19. Transformer
Unit Part # #702 Takagi Part # EM296 Checkpoint A1,A2
Function
-To transform input voltage from 120VAC to 100VAC.
-Every electrical component of the water heater is designed to only work
with a 100VAC power supply, therefore, the water heater comes equipped
with this transformer.
Failure events
1. There is no power coming from the transformer.
2. The voltage from the power supply cannot be converted to 100VAC.
Effects on the water
heater if transformer fails
1. The water heater does not operate due to lack of power from
transformer.
2. A failed transformer can cause electrical damage to other electrical
components within the water heater.
Error codes when
transformer fails
N/A
Diagnostic
1. Visual inspection: connection/breakage of wires and/or signs of electrical
damage.
2. Check voltages of the transformer: Proper range of values shown below.
Color/Number of wires
White – White
120 VAC / less than 1Ω
Brown – Blue
100 VAC ±5 / less than 1Ω
TD1-235
2-1/8" (53.5mm)
5-7/8" (150mm)
2-3/4" (69.5mm)
4" (102mm)
3-1/2" (90mm)
5-7/8" (150mm)
Brown-Blue
100 VAC to the Unit and Heaters
White-Black
120 VAC from the GFI

A.O. Smith T-H2-DV Specifications

General

Brand	A.O. Smith
Model	T-H2-DV
Category	Water Heater
Language	English