7
Table 4 -- Orifice Size and Manifold Pressure (In. W.C.) for Gas Input Rate (Continued)
To Be Used with Modulating Furnaces 59MN7A060V21--20 and 987MA60060V21 ONLY
S
A
G
L
A
R
U
T
A
N
F
O
Y
T
I
V
A
R
G
C
I
F
I
C
E
P
S
S
A
G
.
G
V
A
HEAT VALUE
0.58
0.60
0.62
0.64
AT ALTITUDE
Orifice Mnfld Press Orifice Mnfld Press Orifice Mnfld Press Orifice Mnfld Press
(Btu/cu ft)
No.
Max/Min
No.
Max/Min
No.
Max/Min
No.
Max/Min
ft (m)
(TABULATED DATA BASED ON 20,200 BTUH MAX-HEAT / 8,000 BTUH MIN-HEAT PER BURNER,
DERATED 2%/1000 FT (305M) ABOVE SEA LEVEL)
ALTITUDE
RANGE
650
42
3.4 /0.55
42
3.6 /0.55
42
3.7 /0.60
42
3.8 /0.60
7001
675
42
3.2 /0.50
42
3.3 /0.50
42
3.4 /0.55
42
3.5 /0.55
(2134)
700
43
3.6 /0.55
43
3.7 /0.60
42
3.2 /0.50
42
3.3 /0.50
725
43
3.4 /0.55
43
3.5 /0.55
43
3.6 /0.55
43
3.7 /0.60
750
44
3.6 /0.55
44
3.7 /0.60
43
3.4 /0.55
43
3.5 /0.55
8000
775
44
3.4 /0.55
44
3.5 /0.55
44
3.6 /0.55
44
3.7 /0.60
(2438)
800
44
3.2 /0.50
44
3.3 /0.50
44
3.4 /0.55
44
3.5 /0.55
825
46
3.8 /0.60
45
3.7 /0.60
44
3.2 /0.50
44
3.3 /0.50
625
42
3.4 /0.55
42
3.5 /0.55
42
3.7 /0.55
42
3.8 /0.60
8001
650
42
3.2 /0.50
42
3.3 /0.50
42
3.4 /0.55
42
3.5 /0.55
(2439)
675
43
3.6 /0.55
43
3.7 /0.60
43
3.8 /0.60
42
3.2 /0.50
700
44
3.8 /0.60
43
3.4 /0.55
43
3.6 /0.55
43
3.7 /0.55
725
44
3.6 /0.55
44
3.7 /0.60
44
3.8 /0.60
43
3.4 /0.55
9000
750
44
3.3 /0.50
44
3.4 /0.55
44
3.5 /0.55
44
3.7 /0.55
(2743)
775
45
3.8 /0.60
44
3.2 /0.50
44
3.3 /0.50
44
3.4 /0.55
9001
600
42
3.4 /0.55
42
3.5 /0.55
42
3.6 /0.55
42
3.8 /0.60
(2744)
625
43
3.8 /0.60
42
3.2 /0.50
42
3.3 /0.55
42
3.5 /0.55
650
43
3.5 /0.55
43
3.6 /0.55
43
3.8 /0.60
42
3.2 /0.50
675
44
3.8 /0.60
43
3.4 /0.55
43
3.5 /0.55
43
3.6 /0.55
10000
700
44
3.5 /0.55
44
3.6 /0.55
44
3.7 /0.60
44
3.8 /0.60
(3048)
725
44
3.3 /0.50
44
3.4 /0.55
44
3.5 /0.55
44
3.6 /0.55
* Orifice numbers shown in
BOLD
are factory-installed.
U.
S
.A.
On
ly
to
U.
S
.A.
On
ly
to
U.
S
.A.
On
ly
to
A11621B
Furnace gas input rate on furnace rating plate is for installations at
altitudes up to 2000 ft. (610 M).
In the U.S.A.; the input rating for altitudes above 2000 ft.(610 M)
must be reduced by 2 percent for each 1000 ft. (305 M) above sea
level.
In Canada, the input rating must be derated by 5 percent for
altitudes of 2000 ft. to 4500 ft. (610 to 1372 M) above sea level.
The Conversion Kit Rating Plate accounts for high altitude
derate.
INSTALL ORIFICES
Install main burner orifices. DO NOT use Teflon tape.
Finger--tighten orifices at least one full turn to prevent
cross--threading, then tighten with wrench. There are enough
orifices in each kit for largest furnace. Discard extra orifices.
NOTE
: DO NOT reinstall the manifold at this time.
REMOVE MIXER SCREWS FROM BURNERS
NOTE
:
Each burner contains a mixer screw that must be
removed. Refer to Fig. 5 for the mixer screw location.
1. Remove the mixer screws from the burners.
NOTE
: It is not necessary to plug the hole in the burner when
the mixer screws are removed.
1.9”
(48.76 mm)
1.8”
(46.96 mm)
Location of mixer screw
that must be removed
A11501
Fig. 5 -- Mixer Screw Location
REINSTALL BURNER ASSEMBLY
To reinstall burner assembly:
1. Attach flame sensor to burner assembly.
2. Insert one--piece burner in slot on sides of burner box and
slide burner back in place.
3. Reattach HSI wires to HSI.
4. Verify igniter to burner alignment. See Fig. 6 and 7.
