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Table 19 - - Orifice Size and Manifold Pressure (In. W.C.) for Gas Input Rate (Continued)
(TABULATED DATA BASED ON 20,000 BTUH HIGH-HEAT / 13,000 BTUH LOW-HEAT PER BURNER,
ALTITUDE
RANGE
ft (m)
7001
(2134)
to
8000
(2438)
8001
(2439)
to
9000
(2743)
9001
(2744)
to
10000
(3048)
* Orifice numbers shown in BOLD are factory-installed.
SERVICE AND MAINTENANCE
PROCEDURES
Untrained personnel can perform basic maintenance functions such
as cleaning and replacing air filters. All other operations must be
performed by trained service personnel. A qualified service person
should inspect the furnace once a year.
WARNING
!
FIRE, INJURY OR DEATH HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
The ability to properly perform maintenance on this
equipment requires certain knowledge, mechanical skills,
tools, and equipment. If you do not possess these, do not
attempt to perform any service and maintenance on this
equipment other than those procedures recommended in the
Owner's Manual.
CAUTION
!
ENVIRONMENTAL HAZARD
Failure to follow this caution may result in environmental
pollution.
Remove and recycle all components or materials (i.e. oil,
refrigerant, control board, etc.) before unit final disposal.
TWO-STAGE FURNACE
DERATED 2%/1000 FT (305M) ABOVE SEA LEVEL)
A
V
G
.
G
A
S
HEAT VALUE
0.58
AT ALTITUDE
Orifice Mnfld Press Orifice Mnfld Press Orifice Mnfld Press Orifice Mnfld Press
(Btu/cu ft)
No.
High/Low
650
42
3.4 / 1.4
675
43
3.8 / 1.6
700
43
3.5 / 1.5
725
44
3.8 / 1.6
750
44
3.5 / 1.5
775
44
3.3 / 1.4
800
45
3.8 / 1.6
825
46
3.7 / 1.6
625
42
3.4 / 1.4
650
43
3.8 / 1.6
675
43
3.5 / 1.5
700
44
3.7 / 1.6
725
44
3.5 / 1.5
750
44
3.3 / 1.4
775
45
3.7 / 1.6
600
42
3.3 / 1.4
625
43
3.7 / 1.6
650
43
3.5 / 1.5
675
44
3.7 / 1.6
700
44
3.4 / 1.4
725
44
3.2 / 1.3
S
P
E
C
F I
C I
G
R
A
V
T I
Y
O
F
N
A
0.60
No.
High/Low
No.
42
3.5 / 1.5
42
42
3.2 / 1.4
42
43
3.7 / 1.5
43
43
3.4 / 1.4
43
44
3.7 / 1.5
44
44
3.4 / 1.4
44
44
3.2 / 1.4
44
46
3.8 / 1.6
45
42
3.5 / 1.5
42
42
3.2 / 1.4
42
43
3.6 / 1.5
43
43
3.4 / 1.4
43
44
3.6 / 1.5
44
44
3.4 / 1.4
44
44
3.2 / 1.3
44
42
3.4 / 1.5
42
42
3.2 / 1.3
42
43
3.6 / 1.5
43
44
3.8 / 1.6
43
44
3.5 / 1.5
44
44
3.3 / 1.4
44
WARNING
!
ELECTRICAL SHOCK, FIRE OR EXPLOSION
HAZARD
Failure to follow this warning could result in personal
injury or death, or property damage.
Before installing, modifying, or servicing system, main
electrical disconnect switch must be in the OFF position and
install a lockout tag.
disconnect switch. Lock out and tag switch with a suitable
warning label.
Verify proper operation after servicing.
Always reinstall access doors after completing service and
maintenance.
CAUTION
!
ELECTRICAL OPERATION HAZARD
Failure to follow this caution may result in improper
furnace operation or failure of furnace.
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and dangerous
operation.
General
These instructions are written as if the furnace is installed in an
upflow application. An upflow furnace application is where the
blower is located below the combustion and controls section of the
furnace, and conditioned air is discharged upward. Since this
furnace can be installed in any of the 4 positions shown in Fig. 2,
77
T
U
R
A
L
G
A
S
0.62
0.64
High/Low
No.
High/Low
3.6 / 1.5
42
3.7 / 1.6
3.3 / 1.4
42
3.4 / 1.5
3.8 / 1.6
42
3.2 / 1.4
3.5 / 1.5
43
3.6 / 1.5
3.8 / 1.6
43
3.4 / 1.4
3.5 / 1.5
44
3.7 / 1.5
3.3 / 1.4
44
3.4 / 1.4
3.8 / 1.6
44
3.2 / 1.4
3.6 / 1.5
42
3.7 / 1.6
3.3 / 1.4
42
3.4 / 1.4
3.7 / 1.6
42
3.2 / 1.3
3.5 / 1.5
43
3.6 / 1.5
3.7 / 1.6
44
3.8 / 1.6
3.5 / 1.5
44
3.6 / 1.5
3.3 / 1.4
44
3.4 / 1.4
3.6 / 1.5
42
3.7 / 1.6
3.3 / 1.4
42
3.4 / 1.4
3.7 / 1.6
43
3.8 / 1.6
3.4 / 1.4
43
3.5 / 1.5
3.7 / 1.5
44
3.8 / 1.6
3.4 / 1.4
44
3.5 / 1.5
There may be more than one
A11252B
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