51
TABLE 10
Natural Gas Orifice Drill Size (4% per 1000 ft. De-Rate)
IMPORTANT: For 90+ Furnaces only. Do not use this chart for any 80+ Furnace.
Burner Input (per burner) 15,000 BTU @ Sea Level
Sea level 2000 to 3000 to 4000 to 5000 to 6000 to 7000 to 8000 to
to 1999 ft 2999 ft 3999 ft 4999 ft 5999 ft 6999 ft 7999 ft 8999 ft
47 48 48 49 49 49 50 50
48 49 49 49 50 50 50 51
49 50 50 50 51 51 51 52
50 51 51 51 51 52 52 52
51 51 52 52 52 53 53 53
RGFE/RGGE/RGJF -HIGH
ALTITUDE CONVERSION
FOR RGGE-06 AND RGJF-06 MOD-
ELS, A PRESSURE SWITCH CHANGE
IS NOT NECESSARY AT ANY ELEVA-
TION. FOR RGGE-07 & RGJF-07 MOD-
ELS, A PRESSURE SWITCH CHANGE
IS REQUIRED AT E
LEVATIONS
ABOVE 8,000 FT. FOR ALL OTHER
RGFE/RGGE/RGJF FURNACES, A
PRESSURE SWITCH CHANGE IS
REQUIRED AT ELEVATIONS ABOVE
5,000 FT. THE APPROPRIATE HIGH-
ELEVATION KIT WILL CONVERT THE
FURNACE FOR USE ABOVE THE
APPROPRIATE ELEVATION STATED
HERE. DO NOT INSTALL THE -278
OPTION FURNACE OR THE HIGH
ALTITUDE KIT BELOW THE STATED
ELEVATION. DOING SO CAN CAUSE
SERIOUS PERSONAL INJURY OR
DEATH OR EQUIPMENT FAILURE.
HIGH ALTITUDE CONVERSION
KITS
FOR RGGE-06 & RGJF-06 MODELS, A
PRESSURE SWITCH CHANGE IS NOT
NECESSARY AT ANY ELEVATION.
FOR RGGE-07 & RGJF-07 MODELS, A
PRESSURE SWITCH CHANGE IS
REQUIRED AT ELEVATIONS ABOVE
8,000 FT. FOR ALL OTHER
RGFE/RGGE/RGJF FURNACES, A
PRESSURE SWITCH CHANGE IS
REQUIRED AT ELEVATIONS ABOVE
5,000 FT. THE APPROPRIATE HIGH-
ELEVATION KIT WILL CONVERT THE
FURNACE FOR USE ABOVE THE
ELEVATION STATE
D HERE. DO NOT
INSTALL THE HIGH ALTITUDE KIT
BELOW THE STATED ELEVATION.
DOING SO CAN CAUSE SERIOUS
PERSONAL INJURY OR DEATH OR
EQUIPMENT FAILURE.
HIGH ALTITUDE FIELD
CONVERSION KITS (RGFE MODELS)
MODEL INPUT(BTU) KIT NO.
RGFE-06XXXXX 60,000 RXGY-F34
RGFE-07XXXXX 75,000 RXGY-F35
RGFE-09XXXXX 90,000 RXGY-F36
RGFE-10XXXXX 105,000 RXGY-F37
RGFE-12XXXXX 120,000 RXGY-F38
HIGH ALTITUDE FIELD
CONVERSION KITS (RGGE & RGJF
MODELS)
MODEL INPUT(BTU) KIT NO.
RGGE OR RGJF-06XXXXX 60,000 No Kit
Required
RGGE OR RGJF-07XXXXX 75,000 RXGY-F23
(8000 ft and
above only)
RGGE OR RGJF-09XXXXX 90,000 RXGY-F24
RGGE OR RGJF-10XXXXX 105,000 RXGY-F25
RGGE OR RGJF-12XXXXX 120,000 RXGY-F26
Orifice Selection for High Altitude
Applications
Natural Gas
INSTALLATION OF THIS FURNACE
AT ALTITUDES ABOVE 2000 FT (610
m) SHALL BE IN ACCORDANCE
WITH LOCAL CODES OR, IN THE
ABSENCE OF LOCAL CODES, THE
NAT
IONAL FUEL GAS CODE, ANSI
Z223.1/NFPA 54 OR NATIONAL
STANDARD OF CANADA, NATURAL
GAS AND PROPANE INSTALLATION
CODE, CAN B149.1.
INSTALLATION OF THIS APPLIANCE
AT OR ABOVE 5000 FT (1525 m)
SHALL BE MADE IN ACCORDANCE
WITH THE LISTED HIGH ALTITUDE
CONVERSION KIT AVAILABLE FOR
THIS FURNACE.
34” 90 Plus furnaces installed at high
elevations require the installation of a
high altitude kit for proper operation.
The hi
gh altitude kit consists of a high
altitude pressure switch that replaces
the high pressure switch of the furnace.
The pressure switch must be installed
at elevations above those listed.
Elevations above 2000 ft. require the
furnace to be de-rated 4% per thou-
sand feet. NOTE: Factory installed ori-
fices are calculated and sized based on
a sea level Natural Gas heating value
of 1075 BTU per cubic ft. Region
al
reduced heating values may nullify the
need to change orifices except at
extreme altitudes. Table 10 shows
some quick conversions based on ele-
vation and gas heating value. This table
is combined and simplified from Tables
F1 and F4 of the National Fuel Gas
Code.
Annual Avg. Heat
Value (btu per ft
3
)
850
900
1000
1075
1170
EXAMPLES
The following are examples of orifice
sizing using the National Fuel Gas
Code Appendix F. For a simplified
estimation of orifice size based on
heating value and elevation use
Tables 10 and 11. However, calcula-
tions are the best method.
Example: 900 BTU/ft
3
Regional
Natural Gas Heating Value
I / H = Q
15000 / 900 = 16.68 ft
3
/hr
I = Sea Level input (per burner):
15000
H = Sea Level Heatin
g Value: 900
Q = 16.68 ft
3
Natural Gas per hour.
From Table F.1 of National Fuel Gas
Code Handbook, 2002 (3.5ⴖ w.c. col-
umn)
Orifice required at Sea Level: # 48
From Table F.4 of National fuel Gas
Code Handbook, 2002
Orifice required at 5000 ft. elevation
(4% de-rate per thousand ft): # 50
Orifice required at 8000 ft. elevation
(4% de-rate per thousand ft): # 51
Example: 1050 BTU/ft
3
Regional
Natural Gas Heating Value
I / H = Q
15000 / 1050 = 14.63 ft
3
/hr
I = Sea Level input (per burner):
15000
H = Sea Level Heating Value: 1050
Q= 14.28 ft
3
Natural Gas.
From Table F.1 of National Fuel Gas
code Handbook, 2002 (3.5ⴖ w.c. col-
umn)
Orifice required at Sea Level: # 50
From Table F.4 of National Fuel Gas
code Handbook, 2002
Orifice required at 5000 ft. elevation
(4% de-rate per thousand ft): # 51
Orifice required at 8000 ft
. elevation
(4% de-rate per thousand ft): # 52
CAUTION
!
!
WARNING
!
WARNING
HIGH ALTITUDE INSTALLATIONS
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