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ATI-140H-N
A.O. Smith ATI-140H-N Service Handbook
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Condensing Models
On-Demand W
at
er Heat
er
Service Handbook
100267626
January 2016
MODELS:
A
TI-140H-N
GTS-140-NIH
GT
-140-NIH
T
-H3M-DV
-NG
A
TI-140H-P
GTS-140-PIH
GT
-140-PIH
T
-H3M-DV
-LP
A
T
O-140H-N
GTS-140-NEH
GT
-140-NEH
T
-H3M-OS-NG
A
T
O-140H-P
GTS-140-PEH
GT
-140-PEH
T
-H3M-OS-LP
THIS SERVICE HANDBOOK IS F
OR USE BY QU
ALIFIED SER
VICE PROFESSIONALS ONL
Y
.
IF Y
OU NEED ASSIST
ANCE, CALL TECHNICAL SUPPOR
T A
T 877-737-2840.
2
Table of Contents
Table of Contents
2
Specifications
4
Introduction
5
General Installation Guidelines
5
Normal Operation
6
Activation
6
Operation
6
Shutdown
6
Troubleshooting
7
Preliminary Checklist
7
Gas/Water/Electric
7
Remote Controller
7
High Altitude
7
Long Vent Run
7
Hard Water
7
New Installations
7
External Problem
7
Next Step
7
Water Is too Hot
8
Temperature Fluctuates When a Fixture Is Opened
8
Unit Does Not Ignite When Water Goes through It
9
Abnormal Sounds Come from the Unit
9
Error Codes
10
Abnormal Combustion
10
Incorrect DIP Switch Settings
12
Ignition Failure / Flame Loss
12
Outlet Thermistor Failure
13
Inlet Thermistor Failure
13
Exhaust Thermistor Failure
14
Air-Fuel Ratio Rod Failure
14
Abnormal Solenoid Gas Valve
14
Abnormal Fan Motor
15
False Flame Detection
16
Remote Control Problem
16
Abnormal Exhaust Temperature
17
Abnormal Combustion
17
Dip Switch Settings
19
Wiring Diagram
22
Service Procedures
24
Verifying DIP Switch Settings
24
Unit Draining and Filter Cleaning
24
Checking for a Crossed Connection
25
Checking for a Reversed Connection
25
Checking Inlet Gas Pressure/Purging Air from Gas Line
25
Checking and Adjusting the Manifold Gas Pressure
25
Adjusting Minimum Manifold Pressure
26
Checking the Overheat Cutoff Fuse (OHCF)
27
Checking the Flow Sensor
27
Cleaning the Rod Assembly (Flame Sensor and Air/ Fuel Ratio Rod)
28
Descaling the Unit
29
Draining and Hose Connection
29
Pump and Descale
29
Cleanse the System
29
Cleaning the Combustion Components
29
Maintenance
35
Replacing the Heat Exchanger (Indoor Models)
37
Removing Heat Exchanger Components (Indoor Models)
37
Preparing the New PRIMARY Heat Exchanger for Installation (Indoor Models)
40
Preparing the New SECONDARY Heat Exchanger for Installation (Indoor Models)
41
Installing the Heat Exchanger (Indoor Models)
41
Replacing the Heat Exchanger (Outdoor Models)
46
Removing Heat Exchanger Components (Outdoor Models)
46
Preparing the New PRIMARY Heat Exchanger for Installation (Outdoor Models)
49
Preparing the New SECONDARY Heat Exchanger for Installation (Outdoor Models)
50
Installing the Heat Exchanger (Outdoor Models)
50
Flow Sensor/Control Valve Removal and Installation
55
Removal
55
Installation
55
Burner Removal and Installation
56
Removal
56
Installation
59
Gas Valve/Manifold Plate: Removal and Installation
61
Removal
61
Installation
62
Component Diagrams/Item Numbers
67
Component Item Numbers
71
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A.O. Smith ATI-140H-N Specifications
General
Brand
A.O. Smith
Model
ATI-140H-N
Category
Water Heater
Language
English
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