Indoor installation and venting:
The following installation and service clearances
must be maintained from combustible materials.
Air supply:
Indoor installations and outdoor shelters must be
provided with adequate combustion and ventilation air
vents to assure proper heater operation. These vents
must be sized according to the requirements stated in
A and B below and must never be obstructed when
heater is in operation.
When air blowers are used in spa/hot tub installa-
tions, caution must be observed to insure sufficient
combustion air is available to the gas heater for prop-
er combustion. A separate blower air duct is recom-
mended.
Equipment located in confined spaces:
A.
All Air Supply From Inside The Building:
The
confined space shall be provided with two perma-
nent openings communicating directly with an
additional room(s) of sufficient volume so that the
combined volume of all spaces meets the criteria
for an unconfined space (a space whose volume is
not less than 50 cubic feet per 1000 BTUH). The
total input of all gas utilization equipment installed
in the combined space shall be considered in
making the determination. Each opening shall have
a minimum free area of 1 square inch per 1,000
BTU per hour of the total input rating of all gas
utilization equipment in the confined space, but not
less than 100 square inches. See Figure 9. One
opening shall be within 12 inches of the top and
one within 12 inches of the bottom of the enclosure.
B.
All Air Supply From Outdoors:
The confined
space shall be provided with two permanent
openings, one commencing within 12 inches of
the bottom of the enclosure. The opening shall
communicate directly, or by ducts, with the
outdoors or spaces (crawl or attic) that freely
communicate with the outdoors.
1. When directly communicating with the
outdoors, each opening shall have a
minimum free area of 1 square inch per 4,000
BTU per hour of total input rating of all
equipment in the enclosure. See Figure 10.
2. When communicating with the outdoors
through vertical ducts, each opening shall
have a minimum free area of 1 square inch
per 4,000 BTU per hour of total input rating of
all equipment in the enclosure. See Figure 10.
3. When communicating with the outdoors
through horizontal ducts, each opening shall
have a minimum free area of 1 square inch
per 2,000 BTU per hour of total input rating of
all equipment in the enclosure. See Figure 11.
4. When ducts are used, they shall be of the
same cross-sectional area as the free area of
the openings to which they connect. The
minimum dimension of rectangular air ducts
shall be not less than 3 inches.
NOTE:
For more detailed methods of providing air for
combustion and ventilation, refer to latest edition of
the National Fuel Gas Code, ANSI Z223.1.
7
12. Lift out heat exchanger and rotate it 180
degrees horizontally –
DO NOT FLIP IT OVER.
(This End Up ) sticker should be pointing up.
13. Reinstall front header on heat exchanger
(“TOP” marking on header should now be on
the bottom).
14. Torque header nuts from 5 to 7 ft lbs. in the
sequence shown by Figure 4. Do not
overtighten.
15. Move the pressure switch tube over to the left
side of the heater and route through hole in
intermediate panel. Insert tube in header
fitting and tighten the ferrule down with the
nut.
16. Reattach the high limit wires to the switches.
Route thermistor leads through intermediate
panel, into control compartment, and plug into
control board.
17. Repeat steps 1-4 and 8-11 for reinstallaton.
Outdoor installation and venting:
The following installation and service clearances
must be maintained from surfaces to provide ade-
quate air flow to the heater.
1.
Outdoor models are self-venting and do not
require additional vent piping.
2.
Do not install in a location where growing
shrubs may in time obstruct a heater’s
combustion air and venting areas.
3.
Do not install this appliance under an overhang
less than 3 feet from the top of the appliance.
The area under the overhang must be open
on three sides.
4.
Do not install heater where water spray from
ground sprinklers can contact heater.
Sprinkler water could cause operating problems.
5.
Do not install under a deck.
6.
Any enclosure around the heater must provide
a combustion air vent commencing within 12
inches of the bottom of the enclosure. The
vent opening shall have a minimum free area
of 1 square inch per 4,000 BTU per hour of
total input rating of all heaters in the
enclosure. See Figure 7.
6
ROTATE
HEAT EXCHANGER
180°
DO NOT FLIP
Outdoor Installations
Top - Open and unobstructed
Front - 24”
Back - 6”
Right side (Water side) - 12”
Left side - 6”
1 Square Inch Per 4000 BTU Per Hour
Input
Combustion Air
Ventilation Air
250,000
350,000
400,000
62.5 square in.
87.5 square in.
100 square in.
62.5 square in.
87.5 square in.
100 square in.
Indoor Installations
Top - 36”
Front - Unobstructed
Back - 6”
Right side (Water side) - 12”
Left side - 6”
For use on combustible floors.
Do not install in a closet.
1 Square Inch Per 4000 BTU Per Hour
Input
Combustion Air
Ventilation Air
250,000
350,000
400,000
62.5 square in.
87.5 square in.
100 square in.
62.5 square in.
87.5 square in.
100 square in.
Figure
10
1 Square Inch Per 2000 BTU Per Hour
Input
Combustion Air
Ventilation Air
250,000
350,000
400,000
125 square in.
175 square in.
200 square in.
125 square in.
175 square in.
200 square in.
Figure
11
1 Square Inch Per 1000 BTU Per Hour
Input
Combustion Air
Ventilation Air
250,000
350,000
400,000
250 square in.
350 square in.
400 square in.
250 square in.
350 square in.
400 square in.
Figure
9
Reversible Water Connections
Figure 5
Figure 6
Figure 7
Figure 8
Left Access
Panels
Right Access
Panels
Heater Top
