Carrier 58MXA Installation, Start-Up, And Operating Instructions Manual page 41

TABLE 9—MODEL 58MXA ORIFICE SIZE AND MANIFOLD PRESSURE FOR CORRECT INPUT (Continued)
(TABULATED DATA BASED ON 23,000 BTUH PER BURNER, DERATED 2 PERCENT FOR EACH 1000 FT
ALTITUDE AVG GAS
RANGE HEAT VALUE
(FT) (BTU/CU FT)
725
750
775
800
4001
825
to
850
5000
875
900
925
950
ALTITUDE AVG GAS
RANGE HEAT VALUE
(FT) (BTU/CU FT)
700
725
750
775
800
825
5001
to 850
6000
875
900
925
950
975
1000
ALTITUDE AVG GAS
RANGE HEAT VALUE
(FT) (BTU/CU FT)
650
675
700
725
6001
750
to
775
7000
800
825
850
875
*Orifice numbers shown in shading are factory installed.
return air after furnace has been operating for a period of at least
5 minutes. As soon as limit control has shut off burners, return-air
opening should be unblocked to permit normal air circulation. By
using this method to check limit control, it can be established that
limit is functioning properly and operates if there is a restricted
return-air supply or motor failure. If limit control does not function
during this test, cause must be determined and corrected.
CHECK PRESSURE SWITCH
This control proves operation of draft inducer. Check switch
operation as follows:
FOR USE WITH 140 THROUGH 120 SIZE FURNACES ONLY
ABOVE SEA LEVEL)
0.58
Orifice Manifold Orifice
no. Pressure no.
41 3.6 41
42 3.7 42
42 3.5 42
42 3.3 42
42 3.7 42
43 3.5 43
43 3.3 43
43 3.1 43
43 3.0 43
43 2.8 43
0.58
Orifice Manifold Orifice
no. Pressure no.
41 3.5 41
42 3.7 42
42 3.4 42
42 3.2 42
43 3.7 43
43 3.5 43
43 3.3 43
43 3.1 43
43 2.9 43
43 2.7 43
43 2.6 43
43 2.5 43
43 2.3 43
0.58
Orifice Manifold Orifice
no. Pressure no.
41 3.8 40
41 3.5 41
42 3.6 42
42 3.4 42
43 3.8 42
43 3.6 43
43 3.4 43
43 3.2 43
43 3.0 43
43 2.8 43
SPECIFIC GRAVITY OF NATURAL GAS
0.60 0.62
Manifold Orifice Manifold
Pressure no. Pressure
3.7 41 3.8
3.8 41 3.6
3.6 42 3.7
3.4 42 3.5
3.2 42 3.3
3.6 43 3.8
3.4 43 3.6
3.3 43 3.4
3.1 43 3.2
3.9 43 3.0
SPECIFIC GRAVITY OF NATURAL GAS
0.60 0.62
Manifold Orifice Manifold
Pressure no. Pressure
3.7 41 3.8
3.8 41 3.5
3.5 42 3.7
3.3 42 3.4
3.8 42 3.2
3.6 43 3.7
3.4 43 3.5
3.2 43 3.3
3.0 43 3.1
2.8 43 2.9
2.7 43 2.8
2.6 43 2.6
2.4 43 2.5
SPECIFIC GRAVITY OF NATURAL GAS
0.60 0.62
Manifold Orifice Manifold
Pressure no. Pressure
3.6 40 3.7
3.6 41 3.7
3.7 41 3.5
3.5 42 3.6
3.3 42 3.4
3.7 43 3.8
3.5 43 3.6
3.3 43 3.4
3.1 43 3.2
2.9 43 3.0
1. Turn off 115-v power to furnace.
2. Remove main furnace door and disconnect inducer motor lead
wires from wire harness.
3. Turn on 115-v power to furnace.
4. Set thermostat to call for heat and wait 1 minute. When
pressure switch is functioning properly, hot surface ignitor
should NOT glow, and control center diagnostic light flashes
a Status Code 31. If hot surface ignitor glows when inducer
41
0.64 0.66
Orifice Manifold Orifice
no. Pressure no.
40 3.6 40
41 3.7 41
42 3.8 41
42 3.6 42
42 3.4 42
42 3.2 42
43 3.7 43
43 3.5 43
43 3.3 43
43 3.1 43
0.64 0.66
Orifice Manifold Orifice
no. Pressure no.
40 3.6 40
41 3.6 41
42 3.8 41
42 3.5 42
42 3.3 42
43 3.8 42
43 3.6 43
43 3.4 43
43 3.2 43
43 3.0 43
43 2.9 43
43 2.7 43
43 2.6 43
0.64 0.66
Orifice Manifold Orifice
no. Pressure no.
40 3.8 39
40 3.6 40
41 3.6 41
42 3.7 42
42 3.5 42
42 3.3 42
43 3.7 43
43 3.5 43
43 3.3 43
43 3.1 43
Manifold
Pressure
3.8
3.8
3.6
3.7
3.5
3.3
3.8
3.6
3.4
3.2
Manifold
Pressure
3.7
3.8
3.5
3.7
3.4
3.2
3.7
3.5
3.3
3.1
3.0
2.8
2.7
Manifold
Pressure
3.7
3.7
3.7
3.8
3.6
3.4
3.8
3.6
3.4
3.2