Payne C Series Installation, Start-Up, Operating, Service And Maintenance Instructions page 40

Table 12—Orifice Size* And Manifold Pressure For Gas Input Rate (Continued)
(Tabulated Data Based On 22,000 Btuh Per Burner, Derated 4 Percent For Each 1000 Ft Above Sea Level)
AVG GAS
ALTITUDE
HEAT VALUE
RANGE
AT ALTITUDE
(FT)
(BTU/CU FT)
725
750
775
5001
800
to
6000 825
850
875
900
AVG GAS
ALTITUDE
HEAT VALUE
RANGE
AT ALTITUDE
(FT)
(BTU/CU FT)
675
700
725
6001
750
to
775
7000
800
825
850
AVG GAS
ALTITUDE
HEAT VALUE
RANGE
AT ALTITUDE
(FT)
(BTU/CU FT)
650
675
700
7001
725
to
750
8000
775
800
825
AVG GAS
ALTITUDE
HEAT VALUE
RANGE
AT ALTITUDE
(FT)
(BTU/CU FT)
625
650
675
8001
to 700
9000
725
750
775
* Orifice numbers 43 are factory installed
4. Remove 2 screws from blower access door and remove blower
access door.
5. Disconnect blower leads from furnace control. Record wire
color and location for reassembly. All other factory wires can
be left connected, but field thermostat connections may need
to be disconnected depending on their length and routing.
6. Remove 2 screws holding control box to blower shelf.
7. Hang control box from front of furnace casing and away from
blower compartment.
SPECIFIC GRAVITY OF NATURAL GAS
0.58
Orifice Manifold Orifice
No. Pressure No.
43 3.4 43
43 3.2 43
43 3.0 43
43 2.8 43
43 2.6 43
43 2.5 43
43 2.3 43
43 2.2 43
SPECIFIC GRAVITY OF NATURAL GAS
0.58
Orifice Manifold Orifice
No. Pressure No.
43 3.4 43
43 3.1 43
43 2.9 43
43 2.7 43
43 2.6 43
43 2.4 43
43 2.3 43
43 2.1 43
SPECIFIC GRAVITY OF NATURAL GAS
0.58
Orifice Manifold Orifice
No. Pressure No.
43 3.1 43
43 2.9 43
43 2.7 43
43 2.5 43
43 2.4 43
43 2.2 43
43 2.1 43
48 3.7 43
SPECIFIC GRAVITY OF NATURAL GAS
0.58
Orifice Manifold Orifice
No. Pressure No.
43 2.9 43
43 2.7 43
43 2.5 43
43 2.3 43
43 2.2 43
43 2.0 43
48 3.6 48
39
0.60 0.62
Manifold Orifice Manifold
Pressure No. Pressure
3.5 43
3.3 43
3.1 43
2.9 43
2.7 43
2.5 43
2.4 43
2.3 43
0.60 0.62
Manifold Orifice Manifold
Pressure No. Pressure
3.5 43
3.3 43
3.0 43
2.8 43
2.7 43
2.5 43
2.3 43
2.2 43
0.60 0.62
Manifold Orifice Manifold
Pressure No. Pressure
3.2 43
3.0 43
2.8 43
2.6 43
2.4 43
2.3 43
2.1 43
2.0 43
0.60 0.62
Manifold Orifice Manifold
Pressure No. Pressure
3.0 43
2.8 43
2.6 43
2.4 43
2.2 43
2.1 43
3.7 43
8. Remove 2 screws holding blower assembly to blower deck
and slide blower assembly out of furnace.
9. Clean blower wheel and motor using a vacuum with soft brush
attachment. Blower wheel blades may be cleaned with a small
paint or flux brush. Do not remove or disturb balance weights
(clips) on blower wheel blades.
10. Vacuum any loose dust from blower housing, wheel and
motor.
0.64
Orifice Manifold
No. Pressure
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
2.6 43 2.7
2.5 43 2.6
2.3 43 2.4
0.64
Orifice Manifold
No. Pressure
3.6 43 3.7
3.4 43 3.5
3.1 43 3.2
2.9 43 3.0
2.7 43 2.8
2.6 43 2.7
2.4 43 2.5
2.3 43 2.4
0.64
Orifice Manifold
No. Pressure
3.4 43 3.5
3.1 43 3.2
2.9 43 3.0
2.7 43 2.8
2.5 43 2.6
2.4 43 2.4
2.2 43 2.3
2.1 43 2.2
0.64
Orifice Manifold
No. Pressure
3.1 43 3.2
2.9 43 3.0
2.7 43 2.8
2.5 43 2.6
2.3 43 2.4
2.2 43 2.2
2.0 43 2.1