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A.O. Smith
Water Heater
T-H2-DV
A.O. Smith T-H2-DV User Manual
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T
-H2-DV
/T
-H2
-O
S
S
ervice Ma
n
ual
V
e
r
.
1
.
01
69
C
ON
FIDENT
IAL
12-7. (A
) O
N
/OFF cond
i
t
i
on
s: O
ve
rview
The foll
o
wing t
able shows t
h
e ON/O
F
F
conditions of the
wa
t
e
r
heater
.
ON
/O
FF Co
n
ditions
Cond
i
tions
neede
d
t
o t
urn ON.
The BTU r
equireme
n
t is
mo
r
e than 14,880 B
T
U/
h
AND
The w
a
ter f
lo
w
ra
te is more than 0.5 GPM
C
o
nd
i
tions
neede
d
t
o t
urn OFF
.
The BTU r
equireme
n
t is
less
th
an 11,900 B
TU
/
h
OR
Inlet
temper
a
t
ure
is
h
ig
he
r
than
t
h
e
s
et
temper
a
t
ure
OR
Output temper
a
t
ure i
s
o
ve
r
194°F
OR
The w
ater
f
low
ra
te is le
ss
than
0
.
4
GPM
68
70
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
11
Wiring Diagram
12
Wiring Diagram Checkpoints for Diagnosis
13
A) Resistance Values of the Temperature Thermistors
15
B) Resistance Values of the Temperature Exhaust Thermistors
16
Operational Flow Chart
17
Component Specifications
18
Burners
19
Gas Manifold
20
Fan Motor
21
Fan Motor for Exhaust
22
Gas Valve Assembly
23
Flame Rod
24
AFR Rod
25
Heat Exchanger
26
Secondary Heat Exchanger
27
Flow Sensor
28
Water Control Valve
30
Thermistors
31
Exhaust Thermistor
32
Hi-Limit Switch
33
Hi-Limit Switch for Exhaust
34
Overheat Cutoff Fuse
35
Freeze Protection Heaters
36
Computer Board
37
Transformer
38
Igniter
39
Freeze Protection Thermostat
40
Fuse Box
41
Fault Analysis & Specifications
42
12. Controls and Settings
55
Controls and Settings
55
A) Diagnosis Using the Computer Board
56
B) Diagnosis Using the TM-RE30
57
Verifing Functionality of Computer Board, Displaying Error Code History, and Clearing Error Code History Memory
62
Clearing the "101" and "991" Error Code
64
AFR Rod Function
65
Dipswitch Settings
66
Assigning Unit Numbers in the Easy-Link System
68
A) ON/OFF Conditions: Overview
69
B) ON/OFF Conditions: BTU Requirements
70
A) Pump Control ON/OFF Conditions (Only for Single and Easy-Link System)
71
B) Pump Control ON/OFF Conditions: BTU Requirements
72
Multi-Unit System ON/OFF Conditions
73
Operation Time for Unit Rotation
74
Individual Unit Operation in Easy-Link System While Parent Unit Is under Abnormal Conditions (Individual Operation Mode)
75
High Altitude Region Support Software (FM+, FM++ and FM+++)
76
How to Convert Unit of Set Temperature
77
Control for Exhaust Temperature (T-H2-DV Only)
78
Relay Selection for the Pump Control Connection
79
Alarm Port Terminal
80
Adjusting Manifold Gas Pressure
81
Manually Adjusting the Fan Motor Speed
83
Freeze Protection System
85
Freeze Protection for Recirculation Systems
87
Draining the Unit and Cleaning the Inlet Water Filter
89
Components Diagrams
90
Computer Board Assembly
91
Burner Assembly
91
Parts List
93
Revisions
99
4
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A.O. Smith T-H2-DV Specifications
General
Brand
A.O. Smith
Model
T-H2-DV
Category
Water Heater
Language
English
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