Filter
Top Products
All installations and services must be performed by qualified service personnel.
57
MID-EFFICIENCY COUNTERFLOW / HORIZONTAL GAS FURNACE SPECIFICATIONS
5
Model NO. MDA1-50 MDA1-75 MDA1-100 MDA1-125
Heat input rate (BTUH)
50,000 75,000 100,000 125,000
Heating capacity (BTUH)
1
40,000 60,000 81,000 101,000
Nominal temp. rise
70° F.
Heating fan speed
LOW MD LOW LOW MD LOW
Burner orifice size for nat. gas
0.0935” (#42)
Burner orifice size for L.P. gas
0.0591” (1.5 mm)
AFUE %
81.0 80.0 81.0 81.0
Height of casing
44-1/4”
Width of casing
17” 17” 17” 17”
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
15” x 18” 15” x 18” 19” x 18” 22” x 18”
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
900 730 1400 1220 1595 1370 2075 1790
@MH speed
835 680 1200 1075 1460 1260 1830 1605
@ML speed
- - 926 850 1360 1170 1620 1430
@LO speed
580 425 765 700 1220 1075 1345 1265
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
10-9 R DD 10-9 R DD 10-10 R DD 10-10 R DD
Size of filters
(2) –1” x 17 ¾” x
11 ¾”
(2) –1” x 17 ¾” x
11 ¾”
(2) – 1” x 17 ¾” x
13 ¾”
(2) – 1” x 17 ¾”
x 17 ¾”
Largest recommended air
conditioner
4
2 Ton 3 Ton 3.5 Ton 4 Ton
Electrical power requirements
115 volts, 60 Hz., 1 phase
Min. Fuse size
15 AMP 15 AMP 15 AMP 20 AMP
ACCESSORY ITEMS
Combustible Floor Base
50DA-BASE 50DA-BASE 100CA-BASE 125CA-BASE
Horizontal Plenum Angles
AOPS4942
Vent Kit (top vent option)
AOPS4941
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.