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A.O. Smith
Water Heater
T-D2-OS
A.O. Smith T-D2-OS User Manual
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T
-D2-IN
/
T
-D2-OS
Servic
e
M
a
n
ual
V
e
r
.
1
.00
56
CONFI
D
ENTI
AL
12-7. (A
) O
N
/OFF cond
iti
o
ns
:
Over
view
The foll
o
wi
n
g t
able shows the
ON/OFF c
ond
iti
o
ns
o
f the w
a
ter
heater
.
ON
/O
F
F Conditi
o
ns
Cond
i
tions neede
d
to t
urn ON.
The BTU r
e
quir
eme
n
t i
s more th
an
1
4,
880
B
T
U/h
AND
The w
a
ter flow r
ate is
more than 0.75 GPM
C
o
nditions neede
d
to t
urn OFF
.
The BTU r
e
quir
eme
n
t i
s le
ss than
11,900 B
T
U/
h
OR
Inlet
temper
a
t
u
re
is
h
ig
h
er
than
the
set
temper
a
t
u
re
OR
Output temper
ature i
s over 194°F
OR
The w
a
ter flow r
ate is
le
ss th
an
0
.
4
GPM
55
57
Table of Contents
Table of Contents
2
Specifications
3
Exterior View
4
Interior View
6
List of Main Components in the Interior View
8
Schematic Diagram
10
Wiring Diagram
11
Wiring Diagram Checkpoints for Diagnosis
12
Resistance Values of the Temperature Thermistors
14
Operational Flow Chart
15
Component Specifications
16
Burners
17
Gas Manifold
18
Fan Motor
19
Gas Valve Assembly
20
Flame Rod
21
AFR Rod
22
Heat Exchanger
23
Flow Adjustment Valve
24
Flow Sensor
25
Bypass Valve
26
Thermistors
27
Hi-Limit Switch
28
Overheat Cutoff Fuse
29
Freeze Protection Heaters
30
Computer Board
31
Transformer
32
Igniter
33
Freeze Protection Thermostat
34
Surge Box
35
Fault Analysis & Specifications
36
12. Controls and Settings
46
Controls and Settings
46
Diagnosis Using the TM-RE30
47
The Error-Code Button: Verifying Functionality of Computer Board, Displaying Error Code History, and Clearing Error Code History Memory
50
Clearing the "101" and "991" Error Code
51
AFR Rod Function
52
Dipswitch Settings
53
Assigning Unit Numbers in the Easy-Link System
55
A) ON/OFF Conditions: Overview
56
B) ON/OFF Conditions: BTU Requirements
57
A) Pump Control ON/OFF Conditions (Only for Single and Easy-Link System)
58
B) Pump Control ON/OFF Conditions: BTU Requirements
59
Multi-Unit System ON/OFF Conditions
60
High-Altitude Region Support Functions (FM+, FM++ and FM+++)
61
Relay Selection for the Pump Control Connection
62
Adjusting Manifold Gas Pressure
63
Manually Adjusting the Fan Motor Speed
65
Freeze Protection System
66
Draining the Unit and Cleaning the Inlet Water Filter
69
Components Diagrams
70
Burner Assembly
71
Parts List
73
Revisions
78
4
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A.O. Smith T-D2-OS Specifications
General
Brand
A.O. Smith
Model
T-D2-OS
Category
Water Heater
Language
English
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