Iceco 80PJ SERIES User Manual

24
80+ HIGH ALTITUDE
INSTRUCTIONS
THE NATIONAL FUEL GAS CODE
(NFGC) GUIDELINES SHOULD BE
FOLLOWED WHEN CONVERTING
THESE FURNACES FOR HIGH
ALTITUDE OPERATION.
ELEVATIONS ABOVE 2000 FT
REQUIRE THAT THE FURNACE
INPUT RATING BE ADJUSTED AND
THAT THE SIZE OF THE BURNER
ORIFICES BE RE-CALCULATED
BASED ON ELEVATION AND GAS
HEATING VALUE. THE BURNER
ORIFICES MAY (OR MAY NOT) NEED
TO BE CHANGED. THE FOLLOWING
EXAMPLES SHOW HOW TO
DETERMINE IF AN ORIFICE CHANGE
WILL BE NECESSARY AND HOW TO
DETERMINE THE NEW ORIFICE
SIZE.
IN CANADA, AS AN ALTERNATIVE
TO ADJUSTING THE BURNER
ORIFICE SIZE, THE MANIFOLD GAS
PRESSURE MAY BE ADJUSTED.
THIS METHOD IS COVERED LATER
IN THIS SECTION. THIS METHOD OF
ADJUSTING MANIFOLD PRESSURE
MAY ONLY BE USED IN CANADIAN
INSTALLATIONS.
34" 80 Plus furnaces installed above
2,000 ft. require the furnace to be de-
rated 4% per thousand feet.
NOTE: The factory installed pressure
switch is good at all elevations. It will not
need to be changed.
NOTE: Factory installed orifices are
calculated and sized based on a sea
level Natural Gas heating value of 1075
BTU per cubic ft.
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 5 and 6.
However, calculations are the best
method.
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.
column).
Orifice required at Sea Level: #40
Natural Gas Orifice Drill Size (4% per 1000 ft. De-Rate)
IMPORTANT: 80+ Models only. Do not
use this chart for any 90+ Models.
Burner Input (per burner) 25,000 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 5999 ft 7999 ft 8999 ft
38 39 40 41 41 42 42 43
40 41 42 42 42 43 43 44
41 42 42 42 43 43 44 44
42 42 43 43 43 44 44 45
43 44 44 44 45 45 46 47
Annual Avg. Heat
Value (btu per ft
3
)
850
900
975
1075
1170
TABLE 5
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/ft
3
Regional
Natural Gas Heating Value
I / H = Q
25000 / 1050 = 23.81 ft.
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 National Fuel Gas
Code Handbook, 2002 (3.5 w.c.
column).
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
!
CAUTION
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CAUTION

Iceco 80PJ SERIES Specifications

General

Brand	Iceco
Model	80PJ SERIES
Category	Furnace
Language	English