Goodman Mfg GAS-FIRED WARM AIR FURNACE Manual De Usuario

31

A gas detecting warning system is the only reliable way to detect a
propane gas leak. Rust can reduce the level of odorant in propane
gas.  Do not rely on your sense of smell.  Contact a local propane
gas supplier about installing a gas detecting warning system.  If
the presence of gas is suspected, follow the instructions on Page
4 of this manual.
All propane gas equipment must conform to the safety standards
of the National Board of Fire Underwriters, NBFU Manual 58.
For satisfactory operation, propane gas pressure must be 11 inch
w.c. at the furnace manifold with all gas appliances in operation.
Maintaining proper gas pressure depends on three main factors:

1. Vaporization rate, depending on temperature of the liquid,

and “wetted surface” area of the container or containers.

2. Proper pressure regulation. (Two-stage regulation is

recommended for both cost and efficiency).

3. Pressure drop in lines between regulators, and between

second stage regulator and the appliance. Pipe size will
depend on length of pipe run and total load of all appliances.

Complete information regarding tank sizing for vaporization, recom-
mended regulator settings, and pipe sizing is available from most regu-
lator manufacturers and propane gas suppliers.
Since propane gas will quickly dissolve white lead and most stan-
dard commercial compounds, special pipe dope must be used.
Shellac-based compounds resistant to the actions of liquefied
petroleum gases such as Gasolac

®

, Stalactic

®

, Clyde’s

®

 or John

Crane

®

 are satisfactory.

Refer to the following illustration for typical propane gas installa-
tions.

Maximum Propane Capacities listed are based on 2 psig pressure drop at 10 psig setting.  
Capacities in 1,000 BTU/hour.

10

730

1,700

3,200

5,300

8,300

3,200

7,500

20

500

1,100

2,200

3,700

5,800

2,200

4,200

30

400

920

2,000

2,900

4,700

1,800

4,000

40

370

850

1,700

2,700

4,100

1,600

3,700

50

330

770

1,500

2,400

3,700

1,500

3,400

60

300

700

1,300

2,200

3,300

1,300

3,100

80

260

610

1,200

1,900

2,900

1,200

2,600

100

220

540

1,000

1,700

2,600

1,000

2,300

125

200

490

900

1,400

2,300

900

2,100

150

190

430

830

1,300

2,100

830

1,900

175

170

400

780

1,200

1,900

770

1,700

200

160

380

730

1,100

1,800

720

1,500

To convert to capacities at 15 psig settings - multiply by 1.130
To convert to capacities at 5 psig settings - multiply by 0.879

Maximum Propane Capacities Listed are Based on 1/2" W.C. pressure drop at 11" W.C. setting. 
Capacities in 1,000 BTU/hour.

10

39

92

199

329

501

935

275

567

1,071

2,205

3,307

20

26

62

131

216

346

630

189

393

732

1,496

2,299

30

21

50

107

181

277

500

152

315

590

1,212

1,858

40

19

41

90

145

233

427

129

267

504

1,039

1,559

50

18

37

79

131

198

376

114

237

448

913

1,417

60

16

35

72

121

187

340

103

217

409

834

1,275

80

13

29

62

104

155

289

89

185

346

724

1,066

100

11

26

55

90

138

255

78

162

307

630

976

125

10

24

48

81

122

224

69

146

275

567

866

150

9

21

43

72

109

202

63

132

252

511

787

200

8

19

39

66

100

187

54

112

209

439

665

250

8

17

36

60

93

172

48

100

185

390

590

 

 

*Data in accordance with NFPA pamphlet NO. 54

Duct systems and register sizes must be properly designed for the
CFM and external static pressure rating of the furnace. Design the
ductwork in accordance with the recommended methods of  “Air Con-
ditioning Contractors of America” Manual D.

Install the duct system in accordance with Standards of the National
Board of Fire Underwriters for the Installation of Air Conditioning, Warm
Air Heating and Ventilating Systems. Pamphlets No. 90A and 90B.

A closed return duct system must be used, with the return duct con-
nected to the furnace. NOTE:  Ductwork must never be attached to
the back of the furnace.  Flexible joints may be used for supply and
return connections to reduce noise transmission. To prevent the blower
from interfering with combustion air or draft when a central return is
used, a connecting duct must be installed between the unit and the
utility room wall.  Never us a room, closet, or alcove as a return air
chamber.

When the furnace is used in connection with a cooling unit, the fur-
nace should be installed in parallel with or on the upstream side of the
cooling unit to avoid condensation in the heating element.  With a par-
allel flow arrangement, the dampers or other means used to control
the flow of air must be adequate to prevent chilled air from entering the
furnace and, if manually operated, must be equipped with means to
prevent operation of either unit unless the damper is in the full heat or
cool position.

When the furnace is installed without a cooling coil, it is recommended
that a removable access panel be provided in the outlet air duct.  This
opening shall be accessible when the furnace is installed and shall be
of such a size that the heat exchanger can be viewed for visual light
inspection or such that a sampling probe can be inserted into the air-
stream.  The access panel must be made to prevent air leaks when
the furnace is in operation.

When the furnace is heating, the temperature of the return air entering
the furnace must be between 55°F and 100°F.