Carrier WEATHERMAKER 8000 58WAV - Manual (Page 11)

Table 6—Model 58WAV Orifice Size and Manifold Pressure for Correct Input Rate
(Tabulated Data Based on Altitude Up to 2000 Ft and 22,000 Btuh Per Burner)
GAS
HEAT
VALUE
(BTU/CU FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.56
Orf
No.
Mnfid
Press.
0.58
Orf
No.
Mnfid
Press.
0.60
Orf
No.
Mnfid
Press.
0.62
Orf
No.
Mnfid
Press.
0.64
Orf
No.
Mnfid
Press.
0.66
Orf
No.
Mnfid
Press.
0.68
Orf
No.
Mnfid
Press.
0.70
Orf
No.
Mnfid
Press.
0.72
Orf
No.
Mnfid
Press.
860
41
42
3.2
3.6 41
42
3.3
3.7
41
42
40
3.4
3.8
3.2
41
40 3.5
3.3
41
39
40
3.7
3.2
3.4
41
39
40
3.8
3.3
3.5
39
40
3.4
3.6
38
39
40
3.2
3.5
3.7
38
39
40
3.3
3.6
3.8
875
42 3.4 41
42
3.2
3.6
41
42
3.3
3.7
41
42
40 3.4
3.8
3.2
41
40 3.5
3.3
41
39
40
3.6
3.2
3.4
41
39
40
3.8
3.3
3.5
39
40
3.3
3.6
38
39
40
3.2
3.4
3.7
890
42 3.3 42 3.4 41
42 3.2
3.6 41
42 3.3
3.7
41
42 3.4
3.8 41
40 3.5
3.2
41
40 3.6
3.3 41
39
40 3.7
3.2
3.4
41
39
40
3.8
3.3
3.5
905
42 3.2 42 3.3 42 3.4 41
42 3.2
3.6 41
42 3.3
3.7
41
42 3.4
3.8 41
40 3.5
3.2
41
40 3.6
3.3 41
39
40 3.7
3.2
3.4
920
43 3.8 42 3.2 42 3.3 42 3.4 41
42 3.2
3.5 41
42 3.3
3.7
41
42 3.4
3.8 41
40 3.5
3.2 41
40 3.6
3.3
935
43 3.7 43 3.8 42 3.2 42 3.3 42 3.4 41
42 3.2
3.5 41
42 3.3
3.7
41
42 3.4
3.8 41
40 3.5
3.2
950
43 3.6 43 3.7 43 3.8 42 3.2 42 3.3 42 3.4 41
42 3.2
3.5
41
42
3.3
3.6
41
42 3.4
3.7
965
43 3.4 43 3.6 43 3.7 43 3.8 42 3.2 42 3.3 42 3.4 41
42
3.2
3.5
41
42 3.3
3.6
980
44
43
3.8
3.3
42 3.5 43 3.6 43 3.7 43 3.8 42 3.2 42 3.3 42 3.4 41
42 3.2
3.5
995
44
43 3.7
3.2
44
43 3.8
3.4
43 3.5 43 3.6 43 3.7 43 3.8 42 3.2 42 3.3 42 3.4
1010
3.6 44
43
3.7
3.3 44
43
3.8
3.4
43 3.5 43 3.6 43 3.7 43 3.8 42 3.2 42 3.3
1025
44 3.5 44
43
3.6
3.2
44
43 3.7
3.3'
43 3.4 43 3.5 43 3.6 43 3.7 43 3.8 43 3.2
1040
44 3.4 3.5 44
43 3.6
3.2
44
43 3.7
3.3 43 3.4 43 3.5 43 3.6 43 3.7 43 3.8
1055
44 3.3 44 3.4 44 3.5 44
43 3.6
3.2
44
43 3.8
3.3 43 3.4 43 3.5 43 3.6 43 3.7
1070
44 3.2 44 3.3 44 3.4 44 3.5 44
43 3.7
3.2
44
43 3.8
3.3
43 3.4 43 3.5 43 3.6
1085
45 3.8 44 3.2 44 3.3 44 3.4 44 3.6 44
43 3.7
2.3 44
43 3.8
3.3
43 3.4 43 3.5
1100 45 3.7 45 3.8
3.4
44 3.2 44 3.4 44 3.5 44 3.6 44
43 3.7
3.2
44
43 3.8
3.3
43 3.4
A CAUTION
DO NOT redrill burner orifices. Improper drilling (burrs, out
of round, etc.) can cause excessive burner operating noise and
misdirection of burner flames. This could result in flame
impingement on burners and heat exchanger surfaces, leading
to potential failures.
(2.) Turn off all other gas appliances and pilots.
(3.) Start furnace and let run for 3 minutes.
(4.) Measure time (in sec) for gas meter to complete 1
revolution.
(5.) Refer to Table 7 for cu ft of gas per hr.
(6.) Multiply gas rate (cu ft/hr) by heating value (Btu/cu
ft).
EXAMPLE:
Btu heating input = Btu/cu ft X cu ft/hr
Heating value of gas 1070 Btu/cu ft
Time for 1 revolution of 2-cu ft dial = 72 sec
Gas rate = 100 X 1070=107,000 Btuh ,
(7.) Measured gas input should not exceed gas input on
unit rating plate.
(8.) Proceed to item c. to adjust manifold pressure.
c. Adjust gas input.
(1.) Remove regulator adjustment seal cap. (See Fig. 11.)
(2.) Turn adjusting screw counterclockwise to decrease
input. Turn screw clockwise to increase input. DO
NOT set manifold pressure less than 3.2- in. wc or
more than 3.8-in. wc for natural gas. Make any major
adjustments by changing main burner orifices.
(3.) When correct input is obtained, replace regulator seal
cap. Main burner flame should be clear blue, almost
transparent. (See Fig. 12.)
d. High altitude —In the United States, gas input on rating
plate is for altitudes up to 2000 ft. Ratings for altitudes over
2000 ft must be 4 percent less for each 1000 ft above sea
level. To obtain the altitude adjusted rating, adjust the
manifold pressure (see item c.) and replace the main burner
orifices as needed. Refer to NFGC Appendix F, Table F-4
for proper orifice sizing at high altitudes.
e. Canadian installations only —The Canadian ratings are
approved for altitudes up to 2000 ft for natural and propane
gases. High-altitude ratings are from 2000 "ft to 4500 ft
above sea level. See Table 8 for nominal burner orifice
size. High-altitude rating includes a 10 percent derate as
required by Canadian standards.
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