Carrier 58TUA - Manual (Page 15)

Table 11—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
VALUE
(BTU/CU FT)
0.58 0.60 0.62 0.64 0.66 0.68 0.70 , 0.72
Orf
No.
Heat
High/Low
Orf
No.
Heat
High/Low
Orf
No.
Heat
High/Low
Orf
No.
Heat
High/Low
Orf
No.
Heat
High/Low
Orf
No.
Heat
High/Low
Orf
No.
Heat
High/Low
Orf
No.
Heat
High/Low
860 43 3.7/1.6 43 3.8/1.6 42 3.2/1.4 42 3.3/1.4 42 3.4/1.5
41
42 3.2/1.4
3.6/1.5 41
42 3.3/1.4
3.7/1.5 41
42 3.4/1.4
3.8/1.6
875 43 3.6/1.5 43 3.7/1.6 43 3.8/1.6 42 3.2/1.4 42 3.3/1.4 42 3.4/1.4
41
42 3.2/1.3
3.5/1.5 41
42 3.3/1.4
3.6/1.5
890 43 3.5/1.5 43 3.6/1.5 43 3.7/1.6 43 3.8/1.6 42 3.2/1.4 42 3.3/1.4 42 3.4/1.4
41
42 3.2/1.3
3.5/1.5
905
43
44 3.3/1.3
3.7/1.5
43 3.5/1.4 43 3.6/1.5 43 3.7/1.5 43 3.8/1.6 42 3.2/1.4 42 3.3/1.4 42 3.4/1.4
920
43
44 3.2/1.3
3.7/1.5 43
44 3.3/1.4
3.8/1.6
43 3.5/1.4 43 3.6/1.5 43 3.7/1.5 43 3.8/1.5 42 3.2/1.3 42 3.3/1.3
935 44 3.6/1.5
43
44 3.2/1.4
3.7/1.6 43
44 3.3/1.4
3.8/1.6
43 3.5/1.5 43 3.6/1.5 43 3.7/1.5 43 3.8/1.6 42 3.2/1.3
950 44 3.5/1.5 44 3.6/1.5
43
44 3.2/1.4
3.7/1.6 43
44 3.3/1.4
3.8/1.6
43 3.4/1.5 43 3.6/1.5 43 3.7/1.5 43 3.8/1.6
965 44 3.4/1.4 44 3.5/1.5 44 3.6/1.5
43
44 3.2/1.4
3.7/1.6 43
44 3.3/1.4
3.8/1.6
43 3.4/1.5 43 3.5/1.5 43 3.6/1.5
980 44 3.3/1.4 44 3.4/1.4 44 3.5/1.5 44 3.6/1.5
43
44 3.2/1.4
3.7/1.6 43
44 3.3/1.4
3.8/1.6
43 3.4/1.5 43 3.5/1.5
995
44
45 3.2/1.3
3.8/1.6
44 3.3/1.4 44 3.4/1.4 44 3.5/1.5 44 3.6/1.5
43
44 3.2/1.4
3.7/1.6 43
44 3.3/1.4
3.8/1.6
43 3.4/1.4
1010 45 3.7/1.6
44
45 3.2/1.3
3.8/1.6
44 3.3/1.4 44 3.4/1.4 44 3.5/1.5 44 3.6/1.5
43
44 3.2/1.4
3.7/1.6 43
44 3.3/1.4
3.8/1.6
1025
45
46 3.6/1.5
3.8/1.6
45 3.7/1.6 44 3.2/1.3 44 3.3/1.4 44 3.4/1.4 44 3.5/1.5 44 3.6/1.5
43
44 3.2/1.4
3.7/1.6
1040
45
46 3.5/1.5
3.7/1.6 45
46 3.6/1.5
3.8/1.6
45 3.7/1.6 44 3.2/1.3 44 3.3/1.4 44 3.4/1.4 44 3.5/1.5 44 3.6/1.5
1055
45
46 3.4/1.4
3.6/1.5 45
46 3.5/1.5
3.7/1.6 45
46 3.6/1.5
3.8/1.6
45 3.8/1.6 44 3.2/1.3 44 3.3/1.4 44 3.4/1.4 44 3.5/1.5
1070
45
46 3.3/1.4
3.5/1.5 45
46 3.4/1.4
3.6/1.5 45
46 3.5/1.5
3.7/1.6 45
46 3.7/1.5
3.8/1.6
45 3.8/1.6 44 3.2/1.4 44 3.3/1.4 44 3.4/1.4
1085
45
46
47 3.2/1.4
3.4/1.4
3.8/1.6
45
46 3.3/1.4
3.5/1.5 45
46 3.4/1.5
3.6/1.5 45
46 3.6/1.5
3.7/1.6
45 3.7/1.5 45 3.8/1.6 44 3.2/1.4 44 3.3/1.4
1100
46
47 3.3/1.4
3.7/1.6 45
46 3.2/1.4
3.4/1.4 45
46 3.4/1.4
3.5/1.5 45
46 3.5/1.5
3.6/1.5 45
46 3.6/1.5
3.8/1.6
45 3.7/1.6 45 3.8/1.6 44 3.2/1.4
£. The gas valve and humidifier terminal HUM are not
energized for safety reasons.
NOTE: The EAC terminals are energized when the blower is
energized.
2. Purge gas lines—After all connections have been made, purge
the lines and check for leaks.
A WARNING
Never purge a line into a combustion chamber. Never use
matches, candles, flame or other sources of ignition for the
purpose of checking leakage. Use a soap-and-water solution
to check for leakage. A failure to follow this warning can
cause a fire, explosion, personal injury, or death.
3. To operate furnace, follow procedures on operating instruc­
tions label attached to furnace.
4. With furnace operating, set thermostat below room tempera­
ture and observe that furnace goes off. Set thermostat above
room temperature and observe that furnace restarts.
ADJUSTMENTS
1. Set gas input rate.
The gas input rate must be set for both high-fire and low-fire.
Each adjustment is independently made at the gas control
regulators.
Therfe are 2 methods of adjusting the gas input rate. The
preferred method is by using Table 11 and item a. The second
method is by clocking the gas meter as outlined in item b.
The Procedure in item b. MUST be used for altitudes above
2000 ft.
The gas valve regulator has been nominally set at 1.5-in. wc
for low fire and 3.5-in. wc for high fire for natural gas.
a. Check gas input rate using Table 11.
(1.) Obtain average yearly heat value for local gas supply.
(2.) Obtain average yearly specific gravity for local gas
supply;
(3.) Verify furnace model. Table 11 can only be used for
Model 58TUA Furnaces.
(4.) Check and verify orifice size in furnace. NEVER
ASSUME THE ORIFICE SIZE. ALWAYS CHECK
AND VERIFY.
(5.) Find natural gas heat value and specific gravity in
Table 11.
(6.) Follow heat value and specific gravity lines to point of
intersection. Find orifice size and manifold pressure
settings for proper operation at given natural gas
conditions on low and high fire.
15