31
Table 12. A/C Blower Speed Selection Chart
M1/M5*B Models & for use with Blower Kit No. 903773 1/4 Hp 3 Speed
Furance Input
Heating Speed
Setting
Cooling Speed/ Evap Coil
2 Ton
2-1/2 Ton
3 Ton
086, 090
H
L
M
H
066, 070, 077
M
L
M
H
56
L
L
M
H
M1/M5*C Models & for use with Blower Kit No. 903413 1/2 Hp 4 Speed
Furance Input
Heating
Speed
Setting
Cooling Speed/ Evap Coil
2 Ton
2-1/2 Ton & 3 Ton
3-1/2 Ton
4 Ton
077, 086, 090
ML
L
ML
MH
H
056, 066, 070
L
L
ML
MH
H
M1/M5*D Models & for use with Blower Kit No. 903890 3/4 Hp 4 Speed
Furance Input
Heating
Speed
Setting
Cooling Speed/ Evap Coil
2 Ton
2-1/2 Ton & 3 Ton
3-1/2 Ton & 4 Ton
5 Ton
077, 086, 090
ML
L
ML
MH
H
056, 066, 070
L
L
ML
MH
H
Table 11. Equivalent Orifi ce Sizes for High Altitude Installations
FURNACE
MODELS
ORIFICE SIZE &
OUTPUT CAPACITY
ALTITUDE - FEET
SEA
LEVEL
2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
10,000
M1M - 056
Orifi ce Size - Nat. Gas
29
29
30
30
30
30
31
31
31
32
Orifi ce Size - LP
45
46
47
47
47
48
48
49
49
50
Output - MBTUH
45.4
41.8
40.1
38.5
37.0
35.5
34.1
32.7
31.4
30.2
M1M - 070
Orifi ce Size - Nat. Gas
24
25
26
27
27
28
28
29
29
30
Orifi ce Size - LP
42
42
43
43
43
44
44
45
46
47
Output - MBTUH
56.7
52.3
50.2
48.2
46.2
44.4
42.6
40.9
39.3
37.7
M1M - 077
Orifi ce Size - Nat. Gas
21
23
23
24
25
26
27
28
28
29
Orifi ce Size - LP
40
41
42
42
42
43
43
44
44
45
Output - MBTUH
61.7
56.9
54.6
52.4
50.3
48.3
46.4
44.5
42.7
41.0
M1M - 090
Orifi ce Size - Nat. Gas
17
18
19
19
20
21
22
23
24
26
Orifi ce Size - LP
36
37
38
38
39
40
41
41
42
43
Output - MBTUH
71.7
66.1
63.5
60.9
58.5
56.1
53.9
51.7
49.7
47.7
M1B - 066
Orifi ce Size - Nat. Gas
26
27
28
28
28
29
29
30
30
30
Orifi ce Size - LP
43
44
44
44
45
45
46
47
47
48
Output - MBTUH
52.6
48.5
46.6
44.7
42.9
41.2
39.6
38.0
36.5
35.0
M1B - 086
Orifi ce Size - Nat. Gas
18
19
19
20
21
22
23
24
26
27
Orifi ce Size - LP
37
38
39
39
40
41
42
42
43
43
Output - MBTUH
68.2
62.9
60.3
57.9
55.6
53.4
51.2
49.2
47.2
45.3
NOTES:
For Canadian high altitude (2,000 - 4,500’), reduce gas manifold pressure to 3.0” W.C. for natural gas and 9” W.C. for LP gas.
(Includes 4% Input Reduction for Each 1,000 Feet). These specs do not apply to oil furnace installations. Reference Sources: ANSI Z233.1 &
NFPA 54, National Fuel Gas Code.
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