b. Where communicating with out-
doors through horizontal ducts,
each opening shall have a minimum
free area of 1 square inch for each
2000 BTUH of total input rating of
all equipment in the enclosure. See
Table 4 and Figure 16.
Method 2
One permanent opening, located
within 12 inches of the top of the
enclosure, shall be permitted where
the equipment has clearances of at
least 1 inch from the sides and back
and 6 inches from the front of the
appliance. The opening shall directly
communicate with the outdoors or
communicate through a vertical or
horizontal duct to the outdoors or
spaces (crawl or attic) that freely
communicate with the outdoors, and
shall have a minimum free area of:
a. One square inch for each 3000
BTUH of the total input rating of
all equipment located in the
enclosure (see Table 5), and
b. Not less than the sum of the
areas of all vent connectors in the
confined space.
If the unit is installed where there is
an exhaust fan, sufficient ventilation
must be provided to prevent the
exhaust fan from creating a negative
pressure.
FIGURE 15
AIR FROM ATTIC/CRAWL SPACE
FIGURE 16
OUTSIDE AIR USING A HORIZONTAL INLET & OUTLET
TABLE 4
HORIZONTAL OUTDOOR AIR
OPENING DIMENSIONS
BTUH
Free Area
Round Pipe
Input
Each Opening
Size
60,000
30.00 square inches
7"
75,000
37.50 square inches
7"
90,000
45.00 square inches
8"
105,000
52.50 square inches
9"
120,000
60.00 square inches
9"
TABLE 5
VERTICAL OR HORIZONTAL
OUTDOOR AIR OPENING DIMENSIONS
Combustion air openings must not be
restricted in any manner.
CONSULT LOCAL CODES FOR SPE-
CIAL REQUIREMENTS.
A077601
A077701
BTUH
Free Area
Round Pipe
Input
Each Opening
Size
60,000
20.00 square inches
6"
75,000
25.00 square inches
6"
90,000
30.00 square inches
7"
105,000
35.00 square inches
7"
120,000
40.00 square inches
8"
22
Содержание RGFE
Страница 92: ...92 TABLE 21 FURNACE FAULT CODES EXPANDED W DESCRIPTIONS AND SOLUTIONS CONTINUED ...
Страница 93: ...93 TABLE 21 FURNACE FAULT CODES EXPANDED W DESCRIPTIONS AND SOLUTIONS CONTINUED ...
Страница 94: ...94 TABLE 21 FURNACE FAULT CODES EXPANDED W DESCRIPTIONS AND SOLUTIONS CONTINUED ...
Страница 95: ...95 TABLE 21 FURNACE FAULT CODES EXPANDED W DESCRIPTIONS AND SOLUTIONS CONTINUED ...
Страница 96: ...96 TABLE 21 FURNACE FAULT CODES EXPANDED W DESCRIPTIONS AND SOLUTIONS CONTINUED ...
Страница 97: ...97 TABLE 21 FURNACE FAULT CODES EXPANDED W DESCRIPTIONS AND SOLUTIONS CONTINUED ...
Страница 98: ...98 TABLE 21 FURNACE FAULT CODES EXPANDED W DESCRIPTIONS AND SOLUTIONS CONTINUED ...
Страница 99: ...99 TABLE 21 FURNACE FAULT CODES EXPANDED W DESCRIPTIONS AND SOLUTIONS CONTINUED ...
Страница 101: ...101 TABLE 21 FURNACE FAULT CODES EXPANDED W DESCRIPTIONS AND SOLUTIONS CONTINUED when the inducer is energized at low ...
Страница 102: ...102 TABLE 21 FURNACE FAULT CODES EXPANDED W DESCRIPTIONS AND SOLUTIONS CONTINUED ...
Страница 103: ...103 TABLE 21 FURNACE FAULT CODES EXPANDED W DESCRIPTIONS AND SOLUTIONS CONTINUED ...
Страница 104: ...104 TABLE 21 FURNACE FAULT CODES EXPANDED W DESCRIPTIONS AND SOLUTIONS CONTINUED ...
Страница 105: ...105 TABLE 21 FURNACE FAULT CODES EXPANDED W DESCRIPTIONS AND SOLUTIONS CONTINUED ...
Страница 106: ...106 FIGURE 83 WIRING DIAGRAM STEPPER MODULATING GAS VALVE FUEL CODE HA OR HB FURNACE MODEL IS RGFE RGGE ...
Страница 107: ...107 FIGURE 84 WIRING DIAGRAM SOLENOID CONTROLLED GAS VALVE FUEL CODE HG OR HH FURNACE MODEL RGGE RGFE RGJF ...