Introduction; General Installation Guidelines - A.O. Smith ATI-140H-N Service Handbook

INTRODUCTION

Read and follow all safety messages
and instructions in this handbook and
on the product labeling.
This is the safety alert
symbol. It is used to alert
you to potential physical
injury hazards. Obey all safety
messages that follow this symbol to
avoid possible property damage,
serious injury or death. Do not remove
any permanent instructions, labels, or
the rating plate from either the outside
of the water heater or on the inside of
the access panels.
DANGER indicates a hazardous
situation that, if not avoided, will
result in death or serious injury.
WARNING indicates a hazardous
situation that, if not avoided, could
result in death or serious injury.
CAUTION indicates a hazardous
situation that, if not avoided, could
result in minor or moderate injury.
NOTICE indicates practices not
related to physical injury.
WARNING!
●
Installation and service must be
performed by a qualified installer
(such as a licensed plumber or gas
fitter). Otherwise, the warranty
will be void.
●
The installer/service agent
(licensed professional) is
responsible for correctly installing
or servicing your water heater and
for compliance with all national,
state/provincial, and local codes.
This handbook provides the necessary
information for troubleshooting the
140/T-H3M tankless water heaters.
It will be effective in helping your
troubleshooting needs as long as
the instructions are followed in the
intended order. Here is how to use
this manual:
●
First, refer to the 140/T-H3M
Installation Manual as the primary
source of information. Refer to it
along side this manual throughout
the troubleshooting process.
●
Before troubleshooting, if you are
unfamiliar with how a tankless unit
operates, read "Normal Operation"
on page 6.
●
To double-check or troubleshoot
a new installation, use the
140/T-H3M installation manual.
●
When beginning troubleshooting,
first go through the "Preliminary
Checklist" on page 7. It is
designed to fix the most common
and frequent problems and
provide you with background
information to help narrow down
the information you need.
●
If you have received an error code,
refer to "Error Codes" on page
10. If you have not received
an error code, refer to "General
Issues" on page 7.
●
Consider removing the following
sections from this manual for easy
reference:
•
"Component Diagrams/Item
Numbers" (starting on page
67).
•
The following graphics, which
show the location of basic
components.
◦
Indoor models:
Page 35, Figure 24.
◦
Outdoor models:
Page 36, Figure 25.
This will allow you to lay the
loose pages beside this manual
for easier reference.
If you have any problems or
questions regarding this equipment,
or at any point become confused
or uncomfortable with any of the
Condensing Models: On-Demand Water Heater Service Handbook • 5
procedures, consult the technical service
department or the local service agent.
General
Installa on
Guidelines
1. Follow all local codes, or in the
absence of local codes, follow the
current edition of the National Fuel
Gas Code: ANSI Z223.1/NFPA 54 in
the USA or B149.1 (Natural Gas and
Propane Installation Code) in Canada.
2. Properly ground the unit in
accordance with all local codes
or, in the absence of local codes,
with the National Electrical Codes:
ANSI/NFPA 70 in the USA or CSA
standard C22.1, Canada Electrical
Code, Part 1 in Canada.
3. Carefully plan where you intend to
install your water heater.
4. Check the rating plate for the
correct GAS TYPE, GAS PRESSURE,
WATER PRESSURE and ELECTRIC
RATING. See Figure 1. NOTE:
If this unit does not match your
requirements, do not install.
If any problem occurs, turn off all hot
water taps and turn off the gas. Then
call a trained technician or the gas
company.
Figure 1.
Plate