High Altitude Instructions; Lp Gas; Orifice Ordering Information; Alternate Method For Canadian High-Altitude Derate - Rheem RGPE series Installation Instructions Manual

80+ HIGH ALTITUDE
INSTRUCTIONS (TABLE 13)
CAUTION
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
NATIONAL FUEL GAS CODE, ANSI
Z223.1/NFPA 54 OR NATIONAL STAN-
DARD OF CANADA, NATURAL GAS
AND PROPANE INSTALLATION
CODE, CAN B149.1.
Furnaces can be ordered from the fac-
tory already converted for high altitude
elevations. The factory option for high
altitude elevations would be ordered as
a 278 option (example: a 75k BTU
upflow furnace which is factory convert-
ed for high altitude elevations would
have the model number (-)GPE-
07EAMKR). These factory converted
furnaces come with pressure switches
for high-altitude elevations already
attached. Also, different burner orifices
are installed at the factory which are
one drill size smaller (#43 DMS) than
standard (-)GPE/(-)GLE gas furnaces
(#42 DMS). The smaller orifice is
installed to accommodate for average
heating values expected in most high
altitude areas and a required 4% per
thousand feet reduction in input as
specified by the National Fuel Gas
Code (NFGC). Specific orifices should
always be recalculated for all high alti-
tude installations as outlined below.
Orifices should be changed, if neces-
sary, based on gas heating value and
elevation.
34" 80 Plus furnaces installed above
2,000 ft. require the furnace to be de-
rated 4% per thousand feet.
IMPORTANT: Factory installed orifices
are calculated and sized based on a
sea level Natural Gas heating value of
1075 BTU per cubic ft.
NOTE: Orifices are available through
your local distributor.
Reference Tables 11, 12 and 13 for
appropriate orifice sizing.
NOTE: Keep any parts removed during
LP conversion procedure stored with the
product literature for future use.
The following are examples of orifice
sizing using the National Fuel Gas Code
Appendix F:
Example: 900 BTU/ft 3 Regional
Natural Gas Heating Value
I/H = Q
25000 / 900 = 27.78 ft 3
I = Sea Level input (per burner): 25000
H = Sea Level Heating Value: 900
Q = 27.78 ft 3 Natural Gas per hour.
From Table F.1 of National Fuel Gas
Code Handbook, 2002 (3.5 w.c. col-
umn).
Orifice required at Seal Level: #40
From Table F.4 of National Fuel Gas
Code Handbook, 2002
Orifice required at 5000 ft. elevation (4%
de-rate per thousand ft): #42
Orifice required at 8000 ft. elevation (4%
de-rate per thousand ft.): #44
Example: 1050 BTU/ft3 Regional
Natural Gas Heating Value
I / H = Q
25000 / 1050 = 23.81ft
3
I = Sea Level input (per burner): 25000
H = Sea Level Heating Value: 1050
Q = 23.81 ft 3 Natural Gas per hour.
From Table F.1 of Natural Fuel Gas
Code Handbook, 2002 (3.5 w.c. col-
umn).
Orifice required at Sea Level: #43
From Table F.4 of National Fuel Gas
Code Handbook, 2002
Orifice required at 5000 ft. elevation (4%
de-rate per thousand ft.): #45
Orifice required at 8000 ft elevation (4%
de-rate per thousand ft): #47
LP GAS (TABLE 11)
LP Gas is a manufactured gas that has
consistent heating value across most
regions.
The NFGC guidelines are used with the
following exception:
The recommended LP Gas high altitude
orifice selections differ slightly in that the
NFGC LP orifice chart, as they are not
accurate for Rheem products. The
National Fuel Gas Code LP orifices are
based on an 11" of water column pres-
sure at the orifice, which differs from
products that use 10" of water column
at the orifice. This difference requires a
deviation from the NFGC orifice size
recommendations. The Sea Level input
should still be reduced by 4% per thou-
TABLE 12

ALTERNATE METHOD FOR CANADIAN HIGH-ALTITUDE DERATE

NATURAL GAS
ORIFICE
ALTITUDE INPUT OUTPUT
SIZE
50,000 40,000
75,000 60,000
0' - 2000' 100,000 80,000 #42
125,000 100,000
150,000 120,000
45,000 36,000
67,500 54,000
2001' - 4500' 90,000 72,000 #42
112,500 90,000
135,000 108,000
FIGURE 23
MANIFOLD PRESSURE-CHANGE LABEL
THE MANIFOLD PRESSURE OF THIS APPLIANCE HAS
BEEN FIELD ADJUSTED TO OBTAIN THE CORRECT
INPUT RATING FOR INSTALLATION AT ALTITUDES
BETWEEN 2,000 FEET AND 4,500 FEET ELEVATION.
LA PRESSION DU DISTRIBUTEUR D'ALIMENTATION
DE CET APPAREIL A ÉTÉ AJUSTÉ SUR LES LIEUX AFIN
D'OBTENIR LA BONNE PUISSANCE D'ENTRÉE POUR
UNE INSTALLATION ENTRE 2000 ET 4500 PIEDS
TABLE 11

LP GAS

Altitude burner) 25000
0 to 2000 ft.
2000 -3000
3000 -4000
4000 -5000
5000 -6000
6000 -7000
7000 -8000
8000 -9000
9000 -10000
sand ft. and the orifice size must be
selected based on the reduced input
in Table 11.
ORIFICE ORDERING
INFORMATION
Orifice sizes are selected by adding
the 2-digit drill size required in the
orifice part number. Drill sizes avail-
able are 39 through 64; metric sizes
available 1.10mm (-90) and 1.15mm
(-91):
Orifice Part Number 62-22175-(drill
size)
Example 1:
# 60 drill size orifice required
Part # 62-22175-60
Example 2:
1.15mm drill size orifice required
Part # 62-22175-91
LP GAS
MANIFOLD
ALTITUDE INPUT OUTPUT
PRESSURE
50,000
75,000
3.5" W.C. 0' - 2000' 100,000
125,000 100,000
150,000 120,000
45,000
67,500
2.9" W.C. 2001' - 4500' 90,000
112,500
135,000 108,000
D'ALTITUDE.
92-24399-01-01
Input (per Orifice
Size
25000 #54
24000 #54
23000 #54
22000 #54
21000 #54
20000 #54
19000 #55
18000 #55
17000 #55
ORIFICE MANIFOLD
SIZE PRESSURE
40,000
60,000
80,000 #54 10" W.C.
36,000
54,000
72,000 #54 8.1" W.C.
90,000
29