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All installations and services must be performed by qualified service personnel.
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APPENDIX G: MID-EFFICENCY FURNACE SPECIFICATIONS
MID-EFFICIENCY HIGHBOY GAS FURNACE SPECIFICATIONS
5
Model NO. MHA1-50 MHA1-75 MHA1-100 MHA1-125
Heat input rate (BTUH)
50,000 75,000 100,000 125,000
Heating capacity (BTUH)
1
40,000 59,000 79,000 99,000
Nominal temp. rise
70°F
Heating fan speed
LOW LOW LOW LOW
Burner orifice size for nat. gas
0.0935” (#42)
Burner orifice size for L.P. gas
0.0591” (1.5 mm)
AFUE %
80.0 80.0 80.0 80.0
Height of casing
44-1/4”
Width of casing
17” 17” 21” 24”
Depth of casing
27 ½”
Warm air outlet
2
15” x 18” 15” x 18” 19” x 18” 22” x 18”
Return air inlet
2
25” x 16” 25” x 16” 25” x 16” 25” x 16”
Approx. shipping weight
131 LBS 143 LBS 170 LBS 186 LBS
Dia. of flue (vertical vent)
3” 4” 4” 4”
Dia. of flue (sidewall vent)
3
3” 4” 4” 4”
CFM @ .2” & .5” W.C. external
static pressure
.2” .5” .2” .5” .2” .5” .2’ .5”
@HI speed
950 830 1495 1335 1795 1560 2245 1970
@MH speed
860 740 1205 1125 1590 1410 1885 1710
@ML speed
- - 920 865 1410 1290 1605 1510
@LO speed
580 440 750 700 1240 1160 1350 1300
Blower motor type & frame
Permanent split capacitor, air over, 48 Y
Blower motor nominal HP
1/5 1/3 1/2 3/4
Blower motor full load amps
3.25 6.0 8.0 11.0
Motor shaft diameter
½”
Direction of rotation (shaft end)
Clockwise
No. of speeds
3 4 4 4
Run capacitor
10 mfd
370 VAC
10 mfd
370 VAC
10 mfd
370 VAC
15 mfd
440 VAC
Blower size
10-7 R DD 10-9 R DD 10-9 R DD 10-9 R DD
Size of filters
(1) – 1” x 24 ¾” x
15 ¾”
(1) – 1” x 24 ¾” x
15 ¾”
(1) – 1” x 24 ¾” x
15 ¾”
(1) – 1” x 24 ¾”
x 19 ¾”
Largest recommended air
conditioner
4
2 Ton 3.5 Ton 4 Ton 5 Ton
Electrical power requirements
115 volts, 60 Hz., 1 phase
Min. Fuse size
15 AMP 15 AMP 15 AMP 20 AMP
ACCESSORY ITEMS
Filter Rack
Flange dimensions
2
AOPS 7547
24-1/2” X 15”
AOPS 7547
24-1/2” X 15”
AOPS 7547
24-1/2” X 15”
AOPS 7375
24” X 19”
NOTES:
1. BTU output based on annual fuel utilization efficiency rated by manufacturer.
2. On all outlet and inlet dimensions, the first dimension is width.
3. The MHA1/MDA1 furnaces are approved for sidewall venting using only an approved sidewall power venter. Refer to Side
Wall Venting section of the Installation and service manual provided with the furnace for additional information.
4. To permit largest recommended air conditioning (at .5 static pressure), selection of the highest motor speed is required.
5. All specifications are subject to change without notice.