Outdoor Water Heaters; Combustion Air (Indoor Units Only) Air For Combustion And Ventilation - Raypak 133 Installation & Operating Instructions Manual

Outdoor Water Heaters

These heaters are design certified for outdoor installa-
tion. Heaters must not be installed under an overhang
of less than three (3) feet from the top on the heater.
Three (3) sides must be open in the area under the
overhang. Roof water drainage must be diverted away
from the heaters installed under overhangs with the
use of gutters.
The point from where the flue products exit the heater
must be a minimum of four (4) feet below, four (4) feet
horizontally from or one (1) foot above any door, win-
dow or gravity inlet to a building. The top surface of the
heater shall be at least three (3) feet above any forced
air inlet, or intake ducts located within ten (10) feet hor-
izontally.
Fig. 3: Outdoor Clearances from Openings
High Wind Conditions (Outdoor
Units Only)
In areas where high winds are frequent, it may be nec-
essary to locate the heater a minimum of 3' from high
vertical walls, or install a wind break so the heater is
not in direct wind current.
Combustion Air (Indoor Units
Only) Air for Combustion and
Ventilation
The heater must have both combustion and ventilation
air. Minimum requirements for net free air supply
openings are 12 inches from ceiling for ventilation and
12 inches from the floor for combustion air as outlined
in ANSI Z223.1, and any local codes that may have
jurisdiction.
CAUTION:
Combustion
contaminated by corrosive chemical fumes which
can damage the heater. Measures must be taken to
prevent the entry of corrosive chemical fumes to the
combustion and ventilation air supply. Such
chemicals include, but are not limited to, chlorinated
and/or fluorinated hydrocarbons such as found in
refrigerants, aerosol propellants, dry-cleaning fluids,
degreasers, and paint removers. Other harmful
elements may come from bleaches, air fresheners,
or mastics. Vapors from these types of products can
form corrosive acid compounds when burned in a
gas flame. The resulting acidic condensate can
damage or substantially reduce the life of the heater.
It may become necessary to provide outside air
directly to the heater in order to avoid this problem.
a. All Air From Inside The Building:
Each opening shall have a minimum net free square
inches as noted:
Square
Inches
Model
0133 136
0182/0181 181
0260/0261 264
0330/0331 334
0400/0401 399
0514 512
0624 627
0724 726
0824 825
0962 962
1125 1125
BOLD TYPE indicates Low NOx models.
Table E: All Air From Inside The Building
b. All Air From Outdoors:
When air is supplied directly from outside of building,
each opening shall have a minimum net free square
inches as noted:
Square
Inches
Model
0133 34
0182/0181 46
0260/0261 66
0330/0331 84
0400/0401 100
0514 128
0624 157
0724 182
0824 207
0962 241
1125 282
BOLD TYPE indicates Low NOx models.
Table F: All Air From Outdoors
12
air must not be
Square
Inches
Model
1223 1223
1336 1337
1468 1467
1631 1630
1826 1826
2100 2100
2500 2499
3001 3000
3500 3500
4001 4000
Square
Inches
Model
1223 306
1336 335
1468 367
1631 408
1826 457
2100 525
2500 625
3001 750
3500 875
4001 1000