Carrier 58TUA Installation, Start-Up, And Operating Instructions Manual page 14

Table 8—Model 58TUA Orifice Size and Manifold Pressure for Correct Input Rate
(Tabulated Data Based on Altitude Up to 2000 ft and 20,000 Btuh High Heat/13,000 Btuh Low Heat Per Burner)*
GAS HEAT
0.58
VALUE
Orf Heat
(BTU/CU FT)
No. High/Low
860 43 3.7/1.6
875 43 3.6/1.5
890 43 3.5/1.5
43 3.3/1.3
905
44 3.7/1.5
43 3.2/1.3
920
44 3.7/1.5
935 44 3.6/1.5
950 44 3.5/1.5
965 44 3.4/1.4
980 44 3.3/1.4
44 3.2/1.3
995
45 3.8/1.6
1010 45 3.7/1.6
45 3.6/1.5
1025
46 3.8/1.6
45 3.5/1.5
1040
46 3.7/1.6
45 3.4/1.4
1055
46 3.6/1.5
45 3.3/1.4
1070
46 3.5/1.5
45 3.2/1.4
1085 46 3.4/1.4
47 3.8/1.6
46 3.3/1.4
1100
47 3.7/1.6
*For size 060135 only, input is 19,000 Btuh for high fire. Deduct 0.1-in. from manifold pressure shown in table. Change orifice size if manifold pressure falls below
3.2-in. wc.
EXAMPLE:
Heat value = 980 Btu/cu ft
Specific gravity = 0.62
Therefore: Orifice No. 44*
Manifold pressure 3.5-in. wc on high fire and
1.5-in. wc on low fire.
* The furnace is shipped with No. 45 orifices. Therefore, in
this example all main burner orifices must be changed and
manifold pressure must be adjusted.
(7.) Proceed to item c. to adjust manifold pressure.
b. Check gas input rate by clocking gas meter for low and
high fire.
(1.) Obtain average yearly heat value for local gas supply.
NOTE: Be sure heating value used for calculations is correct for
your altitude. Consult local gas utility for altitude adjustments (if
any) of gas heating value.
(2.) Check and verify orifice size in furnace. NEVER
ASSUME THE ORIFICE SIZE. ALWAYS CHECK
AND VERIFY.
(3.) Turn off all other gas appliances and pilots.
SPECIFIC GRAVITY OF NATURAL GAS
0.60 0.62
Orf Heat Orf Heat
No. High/Low No. High/Low
43 3.8/1.6 42 3.2/1.4
43 3.7/1.6 43 3.8/1.6
43 3.6/1.5 43 3.7/1.6
43 3.5/1.4 43 3.6/1.5
43 3.3/1.4
43 3.5/1.4
44 3.8/1.6
43 3.2/1.4 43 3.3/1.4
44 3.7/1.6 44 3.8/1.6
43 3.2/1.4
44 3.6/1.5
44 3.7/1.6
44 3.5/1.5 44 3.6/1.5
44 3.4/1.4 44 3.5/1.5
44 3.3/1.4 44 3.4/1.4
44 3.2/1.3
44 3.3/1.4
45 3.8/1.6
45 3.7/1.6 44 3.2/1.3
45 3.6/1.5
45 3.7/1.6
46 3.8/1.6
45 3.5/1.5 45 3.6/1.5
46 3.7/1.6 46 3.8/1.6
45 3.4/1.4 45 3.5/1.5
46 3.6/1.5 46 3.7/1.6
45 3.3/1.4 45 3.4/1.5
46 3.5/1.5 46 3.6/1.5
45 3.2/1.4 45 3.4/1.4
46 3.4/1.4 46 3.5/1.5
0.64 0.66
Orf Heat Orf Heat
No. High/Low No. High/Low
42 3.3/1.4 42 3.4/1.5
42 3.2/1.4 42 3.3/1.4
43 3.8/1.6 42 3.2/1.4
43 3.7/1.5 43 3.8/1.6
43 3.6/1.5 43 3.7/1.5
43 3.5/1.5 43 3.6/1.5
43 3.3/1.4
43 3.4/1.5
44 3.8/1.6
43 3.2/1.4 43 3.3/1.4
44 3.7/1.6 44 3.8/1.6
43 3.2/1.4
44 3.6/1.5
44 3.7/1.6
44 3.5/1.5 44 3.6/1.5
44 3.4/1.4 44 3.5/1.5
44 3.3/1.4 44 3.4/1.4
44 3.2/1.3 44 3.3/1.4
45 3.8/1.6 44 3.2/1.3
45 3.7/1.5
45 3.8/1.6
46 3.8/1.6
45 3.6/1.5
45 3.7/1.5
46 3.7/1.6
45 3.5/1.5 45 3.6/1.5
46 3.6/1.5 46 3.8/1.6
(4.) Turn SW-2 to ON. Close R-W/W1 and jumper R to
W2 to start furnace in high fire and let run for 3
minutes.
(5.) Measure time (in sec) for gas meter to complete 1
revolution.
(6.) Refer to Table 8 for cubic ft of gas per hr.
(7.) Multiply gas rate (cubic ft/hr) by heating value (Btu/
cubic ft).
EXAMPLE:
Btu/hr 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 cu ft/hr (from Table 9)
Btu heating input = 100 X 1070 = 107,000 Btuh
(8.) Remove jumper R to W2 and repeat items (5.) through
(8.) for low fire.
NOTE: High altitude—In the United States, gas input on rating
plate is for altitudes up to 2000 ft. for natural and propane gases.
Ratings for altitudes over 2000 ft MUST be reduced 4 percent for
each 1000 ft above sea level. To obtain the adjusted altitude rating,
14
0.68 0.70
Orf Heat Orf Heat
No. High/Low No. High/Low
41 3.2/1.4 41 3.3/1.4
42 3.6/1.5 42 3.7/1.5
41 3.2/1.3
42 3.4/1.4
42 3.5/1.5
42 3.3/1.4 42 3.4/1.4
42 3.2/1.4 42 3.3/1.4
43 3.8/1.5 42 3.2/1.3
43 3.7/1.5 43 3.8/1.6
43 3.6/1.5 43 3.7/1.5
43 3.4/1.5 43 3.5/1.5
43 3.3/1.4
43 3.4/1.5
44 3.8/1.6
43 3.2/1.4 43 3.3/1.4
44 3.7/1.6 44 3.8/1.6
43 3.2/1.4
44 3.6/1.5
44 3.7/1.6
44 3.5/1.5 44 3.6/1.5
44 3.4/1.4 44 3.5/1.5
44 3.3/1.4 44 3.4/1.4
44 3.2/1.4 44 3.3/1.4
45 3.8/1.6 44 3.2/1.4
45 3.7/1.6 45 3.8/1.6
0.72
Orf Heat
No. High/Low
41 3.4/1.4
42 3.8/1.6
41 3.3/1.4
42 3.6/1.5
41 3.2/1.3
42 3.5/1.5
42 3.4/1.4
42 3.3/1.3
42 3.2/1.3
43 3.8/1.6
43 3.6/1.5
43 3.5/1.5
43 3.4/1.4
43 3.3/1.4
44 3.8/1.6
43 3.2/1.4
44 3.7/1.6
44 3.6/1.5
44 3.5/1.5
44 3.4/1.4
44 3.3/1.4
44 3.2/1.4