3
Table 2. M1 Furnace Specifications
NOTICE TO INSTALLER
Installer is advised to follow carefully all instructions and
warnings in this manual to insure maximum performance,
safety, and operating efficiency of these appliances. Improper
installation may create hazardous conditions, and will void
the appliance warranty.
1. SPECIFICATIONS
GENERAL DESCRIPTION
M1 Series gas and oil furnaces are listed direct vent (sealed
combustion), downflow heating appliances for manufactured
(mobile) homes, recreational vehicles, and for use in residential/
modular/commercial construction. The furnace must be located
so that venting can be properly achieved.
“A” cabinet models may be installed with Optional Coil Cabinet
Model #911969 for air conditioning.
“B” cabinet models are factory equipped with a built-in coil cavity.
Multi-speed blower assemblies as shown in Table 3 have
been certified for field installation in M1 Series furnaces. An air
conditioner can be easily field installed with M1GH Series
furnaces if used in conjunction with certified 2-wire relay box,
p/n 903092A or 4/5 wire relay box 902898A.
Electrical Supply - 120 volts, 60HZ, 1 Ph.
Thermostat Circuit - 24 volts, 60HZ, 30 vac
Fuse or Breaker - 15 amps
Normal Anticipator Setting - 0.4
Temperature Rise - 45° to 75°F
Manifold Pressure - Natural Gas: 3.5” w.c. LP Gas: 10” w.c.
High Altitude - See Table 11. For Canadian High Altitude (2,000’ to 4,500’), reduce the gas manifold pressure
to 3.0” W.C. for natural gas and to 8” W.C. for LP gas.
*Blower capacity only - needs relay box for AC
Table 3. Field Installation Blower Assemblies
A/C Capacity
Blower Wheel
Motor-Hp
Ton
903412
10 x 8
1/3
2, 2½ & 3
903413
11 x 8
1/2
2, 2½, 3 & 4
903414
10 x 8
3/4
2, 2½, 3, 4 & 5
Part No.
Blower / Motor Assembly
Furnace
Input
Output
Orifice No
E.S.P.
Pilot
Ignitor
Comb.
Motor
A/C Ready
Model No
MBtu/h
MBtu/h
Nat.
LP
In WC
Burner
Direct
Blower
Hp
Tons
M1GH 056
56
45
29
45
0.2
x
1/8
2*
M1GB 056
56
45
29
45
0.3
x
1/3
3
M1GC 056
56
45
29
45
0.3
x
1/2
4
M1GD 056
56
45
29
45
0.3
x
3/4
5
M1GH 070
70
57
24
42
0.3
x
1/5
2½*
M1GB 070
70
57
24
42
0.3
x
1/3
3
M1GC 070
70
57
24
42
0.3
x
1/2
4
M1GD 070
70
57
24
42
0.3
x
3/4
5
M1GH 077
77
60
21
40
0.3
x
x
1/4
3*
M1GB 077
77
60
21
40
0.3
x
x
1/4
3
M1GC 077
77
60
21
40
0.3
x
x
1/2
4
M1GD 077
77
60
21
40
0.3
x
x
3/4
5
M1GH 090
90
70
17
36
0.3
x
x
1/4
3*
M1GB 090
90
70
17
36
0.3
x
x
1/4
3
M1GC 090
90
70
17
36
0.3
x
x
1/2
4
M1GD 090
90
70
17
36
0.3
x
x
3/4
5
M1MA 056
56
46
29
45
0.2
x
x
1/8
2
M1MB 056
56
46
29
45
0.3
x
x
1/3
3
M1MC 056
56
46
29
45
0.3
x
x
1/2
4
M1MD 056
56
46
29
45
0.3
x
x
3/4
5
M1MA 070
70
57
24
42
0.3
x
x
1/5
2½
M1MB 070
70
57
24
42
0.3
x
x
1/3
3
M1MC 070
70
57
24
42
0.3
x
x
1/2
4
M1MD 070
70
57
24
42
0.3
x
x
3/4
5
M1MB 077
77
62
21
40
0.3
x
x
1/4
3
M1MC 077
77
62
21
40
0.3
x
x
1/2
4
M1MD 077
77
62
21
40
0.3
x
x
3/4
5
M1MB 090
90
72
17
36
0.3
x
x
1/4
3
M1MC 090
90
72
17
36
0.3
x
x
1/2
4
M1MD 090
90
72
17
36
0.3
x
x
3/4
5
M1BA 066
66
53
26
43
0.24
x
x
1/5
2½
M1BC 066
66
53
26
43
0.3
x
x
1/2
4
M1BB 086
86
68
18
37
0.3
x
x
1/4
3
M1BC 086
86
68
18
37
0.3
x
x
1/2
4
M1SA 066
66
54
.50 Gph
0.24
x
Burner Model
1/5
2½
M1SC 066
66
54
.50 Gph
0.3
x
AF-10 Nozzle
1/2
4
M1SB 086
86
71
.65 Gph
0.3
x
Spray Angle
1/4
3
M1SC 086
86
71
.65 Gph
0.3
x
80° A
1/2
4
