Installation Sheet

13 Page
Installaon
Installaon Manual
-Clearances-
Maintain all clearances around the water
heater. Failure to do so could create a
fire hazard, potentially leading to death,
serious injury, and/or property damage.
WARNING
Top
12 in.(305 mm)
Front 4 in.(102 mm)
24 in. (610 mm)
Recommended
for maintenance
Boom
12 in.(305 mm)
Side
3 in.
(76 mm)
Side
3 in.
(76 mm)
Back
0.5 in.
(13 mm)
-Combustion air supply-
The water heater location must provide enough air for proper combustion and ventilation of the surrounding
area. See the current edition of ANSI Standard Z223.1 or any applicable local codes. In general, these require-
ments 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 water heater:
Water heater size When drawing make-up air from out-
side the building
When drawing make-up air from inside the
building (from other rooms within)
Max.
380,000 BTU/h
25.3 in
2
(163.2 cm
2
) 380 in
2
(2451.6 cm
2
)
When combustion air is supplied
from outside the building, an open-
ing communicating directly with the
outside should have a minimum free
area of one square inch per 15,000
BTUH input of the total input rating
of water heater in the enclosed area.
When combustion air is supplied from inside
the building, an opening 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 199 in
2
(1283.9 cm
2
).
ON
MST
P-ALARM
OUT DIRE MODE TMP3 TMP2 TMP1
87654321
The dark squares indicate the cor-
rect positions of DIP switches.
Lower bank of DIP switches
INDOOR INSTALLATION
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, Propane Installation Code in
Canada.
2. Do not change the DIP switch settings for indoor installations. The DIP switch settings were already
set at the factory. Make sure the No. 5 ("DIRE") and No. 6 ("OUT") DIP switches are in the OFF posi-
tion. (These switches are located on the lower bank of DIP switches as shown below.)
3. For venting instructions for indoor installations, refer to pp. 15 to 20.