All installations and services must be performed by qualified service personnel.

MID-EFFICIENCY COUNTERFLOW / HORIZONTAL GAS FURNACE SPECIFICATIONS5

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 outlet2

15” x 18”

 

15” x 18”

 

19” x 18”

22” x 18”

Return air inlet2

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

.2”

 

.5”

 

.2”

 

.5”

 

.2”

.5”

.2’

.5”

static pressure

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

@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

 

10 mfd

 

10 mfd

15 mfd

 

370 VAC

 

370 VAC

 

370 VAC

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

 

(2) –1” x 17 ¾” x

 

(2) – 1” x 17 ¾” x

(2) – 1” x 17 ¾”

 

 

11 ¾”

 

11 ¾”

 

13 ¾”

x 17 ¾”

Largest recommended air

 

2 Ton

 

3 Ton

 

3.5 Ton

4 Ton

conditioner4

 

 

 

 

 

 

 

 

 

 

 

 

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.

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Thermo Products MHA1-125N, MDA1-50N, MHA1-75N, MHA1-100N, MHA1-50N, MDA1-75N, MDA1-125N Nominal temp. rise Heating fan speed