Indoor Installation - Takagi T-K3-SP Installation Manual And Owner's Manual

INDOOR INSTALLATION (T-K3-SP ONLY)
1. Follow all local codes, or in the
absence of local codes, follow
the most recent edition of the
National Fuel Gas Code: ANSI
Z223.1/NFPA 54 in the USA or
CAN/CSA B149.1 Natural Gas,
Propane Installation
Canada.
2. When installed indoors, the T-K3-
SP water heater shall be located
in an area to maintain the
following minimum
around the unit:
The water heater location must provide enough air for proper combustion and ventilation of the
surrounding area. See the latest edition of ANSI Standard Z223.1 or any applicable local
codes. In general, these requirements specify that if the unit is installed in a confined space,
there must be a permanent air supply opening.
Minimum recommended air supply opening size for the T-K3-SP:
Water heater size
When drawing make-up air from
outside the building
When combustion air is supplied
from outside the building, an
opening communicating directly
MAX 190,000 BTU
with the outside should have a
minimum
square inch per 15,000 BTUH
input of the total input rating of
water heater in the enclosed
area.
Combustible Air Supplied by Mechanical fan or Make up air device
The T-K3-SP water heater is equipped with a combustible air sensor that will shut off the unit
when inadequate combustible air supply to unit is detected.
•
If a mechanical fan or make up air device is used to supply air to the water heater or
utility room, the installer should make sure it does not create drafts which could cause
nuisance shutdowns.
•
If a blower is necessary to provide adequate combustion air to the water heater, the
blower and water heater must be set up so that the water heater cannot fire unless the
blower is operating.
sensors/transmitters and relays.
Code in
clearances
Combustion Air Supply
12.7 Sq. IN
free area of one
Possible methods include the use of external flow
- 9 -
SP
When drawing make-up air from inside
the building (from other rooms within)
190 Sq. IN
When combustion air is supplied from
inside the building,
communicating with the rest of the
dwelling should have a minimum free
area of one square inch per 1,000
BTUH input of the total input rating of
water heater in the enclosed area.
This opening should never be less
than 190 sq. in.
an opening