Takagi 100 Series, Service Handbook

Page: 5 / 80

BASICS
BASICS
On-Demand Water Heater Service Handbook for 240, 340 & 540 Condensing Models • 5
BASICS
BASICS
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 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).
●
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.
●
Failure to comply with these warnings
could result in death, explosion, fire,
or carbon monoxide poisoning.
CAUTION
Wear eye protection during water
heater assembly or disassembly.
Failure to do so could lead to
personal injury.
This handbook provides the necessary
information for troubleshooting the
240/T-H3J, 340/T-H3S, and 540/T-H3
tankless water heaters. It will be ef-
fective 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 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.
●
Before troubleshooting a new
installation, use the installation
manual.
●
Before troubleshooting, first go
through the “Preliminary Checklist”
on page 7. It will identify the most
common and frequent problems and
provide you with general knowledge
to help narrow down the information
you need.
●
If the water heater is in fault and
is displaying an error code, refer
to “Error Codes” on page 11.
If you have not received an error
code, refer to “General Issues” on
page page 8.
●
The following sections can be
removed from this manual for
easy reference as you work:
•
“Component Diagrams/Item
Numbers” (starting on page 71).
•
The following graphics, which
show the location of basic
components.
◦
Indoor model:
page 49.
◦
Outdoor model:
page 50.
If you have any problems or questions
regarding this equipment, consult the
technical service department or the local
service agent.
General Installation
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 the left-hand and right-hand
sides of the water heater.)
NOTE:
If this unit does not match your
requirements, do not install.