![background image](http://html.mh-extra.com/html/carrier/58cva/58cva_installation-start-up-operating-and-service-and-maintenance-instructions_2562745036.webp)
c. Turn on 115-v power to furnace.
d. Set thermostat to
″
call for heat
″
and wait 1 minute. When
pressure switch is functioning properly, hot surface igniter
should NOT glow and control diagnostic light flashes a
status code 32. If hot surface igniter glows when inducer
motor is disconnected, shut down furnace immediately.
e. Determine reason pressure switch did not function properly
and correct condition.
f. Turn off 115-v power to furnace.
g. Reconnect inducer motor wires, replace outer door, and
turn on 115-v power.
TABLE 11–Orifice Size and Manifold Pressure for Gas Input Rate(Tabulated Data Based On 21,000 Btuh
High-Heat/14,500 Btuh for Low-Heat Per Burner,
Derated 4 Percent For Each 1000 Ft Above Sea Level)
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
(BTU/CU FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58
0.60
0.62
0.64
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
U.S.A.
and
Canada
0
to
2000
900
42
3.2/1.5
42
3.3/1.6
42
3.4/1.6
42
3.5/1.7
925
43
3.7/1.8
43
3.8/1.8
42
3.2/1.5
42
3.3/1.6
950
43
3.5/1.7
43
3.6/1.7
43
3.7/1.8
43
3.8/1.8
975
43
3.3/1.6
43
3.4/1.6
43
3.5/1.7
43
3.7/1.7
1000
44
3.6/1.7
43
3.3/1.6
43
3.4/1.6
43
3.5/1.7
1025
44
3.4/1.6
44
3.6/1.7
43
3.2/1.5
43
3.3/1.6
1050
44
3.3/1.6
44
3.4/1.6
44
3.5/1.7
43
3.2/1.5
1075
45
3.8/1.8
44
3.2/1.5
44
3.3/1.6
44
3.4/1.6
1100
46
3.8/1.8
45
3.7/1.8
44
3.2/1.5
44
3.3/1.6
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
(BTU/CU FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58
0.60
0.62
0.64
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
U.S.A.
and
Canada
U.S.A.
Altitudes
2001
to
3000
or
Canada
Altitudes
2001
to
4500
800
43
3.8/1.8
42
3.2/1.5
42
3.3/1.6
42
3.4/1.6
825
43
3.5/1.7
43
3.7/1.7
43
3.8/1.8
42
3.2/1.5
850
43
3.3/1.6
43
3.5/1.6
43
3.6/1.7
43
3.7/1.8
875
43
3.2/1.5
43
3.3/1.6
43
3.4/1.6
43
3.5/1.7
900
44
3.4/1.6
44
3.5/1.7
43
3.2/1.5
43
3.3/1.6
925
44
3.2/1.5
44
3.3/1.6
44
3.5/1.6
44
3.6/1.7
950
45
3.7/1.8
45
3.8/1.8
44
3.3/1.6
44
3.4/1.6
975
46
3.7/1.8
46
3.8/1.8
45
3.8/1.8
44
3.2/1.5
1000
46
3.5/1.7
46
3.6/1.7
46
3.8/1.8
45
3.7/1.8
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
(BTU/CU FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58
0.60
0.62
0.64
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
U.S.A. Only
3001
to
4000
775
43
3.5/1.7
43
3.7/1.7
43
3.8/1.8
42
3.2/1.5
800
43
3.3/1.6
43
3.4/1.6
43
3.5/1.7
43
3.7/1.7
825
44
3.6/1.7
43
3.2/1.5
43
3.3/1.6
43
3.4/1.6
850
44
3.4/1.6
44
3.5/1.7
44
3.6/1.7
43
3.2/1.5
875
45
3.8/1.8
44
3.3/1.6
44
3.4/1.6
44
3.5/1.7
900
46
3.8/1.8
45
3.8/1.8
44
3.2/1.5
44
3.3/1.6
925
46
3.6/1.7
46
3.7/1.8
45
3.7/1.8
45
3.8/1.8
950
46
3.4/1.6
46
3.5/1.7
46
3.7/1.7
46
3.8/1.8
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
(BTU/CU FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58
0.60
0.62
0.64
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
Orifice
no.
Manifold
Pressure
U.S.A.
Only
4001
to
5000
750
43
3.3/1.6
43
3.4/1.6
43
3.5/1.7
43
3.6/1.7
775
44
3.6/1.7
43
3.2/1.5
43
3.3/1.6
43
3.4/1.6
800
44
3.3/1.6
44
3.4/1.6
44
3.6/1.7
43
3.2/1.5
825
45
3.8/1.8
44
3.2/1.5
44
3.4/1.6
44
3.5/1.6
850
46
3.8/1.8
45
3.7/1.8
45
3.8/1.8
44
3.3/1.6
875
46
3.5/1.7
46
3.7/1.7
46
3.8/1.8
45
3.7/1.8
900
47
3.8/1.8
46
3.5/1.7
46
3.6/1.7
46
3.7/1.8
925
47
3.6/1.7
47
3.7/1.8
47
3.8/1.8
46
3.5/1.7
* Orifice numbers 43 are factory installed
35