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Warning: pressure testing supply piping, Gas connection size, Sizing gas supply line – Reznor LDAP Unit Installation Manual User Manual

Page 11

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Form I-LDAP, P/N 207733R6, Page 11

All piping must be in accordance with requirements outlined in the National

Fuel Gas Code ANSI/Z223.1a (latest edition) or CSA-B149.1 and B149.2 (See

Paragraph 1.4). Gas supply piping installation should conform with good prac-

tice and with local codes. Support gas piping with pipe hangers, metal strap-

ping, or other suitable material; do not rely on the heater to support the gas

pipe.
The heater is orificed for operation with natural gas having a heating value of

1000 (± 50) BTU per cubic ft or propane gas with a heating value of 2500 (±

100) BTU per cubic ft. If the gas at the installation does not meet these speci-

fications, consult the factory for proper orificing.

Gas Connection Size

Pipe joint compounds (pipe dope) shall be resistant to the action of liquefied

petroleum gas or any other chemical constituents of the gas being supplied.

Install a ground joint union and manual shutoff valve upstream of the heater

control system, as shown in

FIGURE 6. Installation of a trap with a minimum 3”

(76mm) drip leg is required.
To connect the gas, the heater is equipped with a nipple that extends outside

the cabinet.
Leak-test all connections by brushing on a leak-detecting solution.

Gas Connection - inches/mm

Size

Natural

Gas

Propane

400

inches

1

1

mm

25.4

25.4

800

inches

1-1/4

1-1/4

mm

31.8

31.8

1200

inches

1-1/4

1-1/4

mm

31.8

31.8

Sizing Gas Supply

Line

Capacity of Piping - Cubic Feet per Hour based on 0.3” w.c. Pressure Drop

Specific Gravity for Natural Gas -- 0.6 (Natural Gas -- 1000 BTU/Cubic Ft)

Specific Gravity for Propane Gas -- 1.6 (Propane Gas -- 2550 BTU/Cubic Ft)

Length

Diameter of Pipe

of

1”

1-1/4”

1-1/2”

2”

2-1/2”

Pipe Natural Propane Natural Propane Natural Propane Natural Propane Natural Propane

20’

350

214

730

445

1100

671

2100

1281

3300

2013

30’

285

174

590

360

890

543

1650

1007

2700

1647

40’

245

149

500

305

760

464

1450

885

2300

1403

50’

215

131

440

268

670

409

1270

775

2000

1220

60’

195

119

400

244

610

372

1105

674

1850

1129

70’

180

110

370

226

560

342

1050

641

1700

1037

80’

170

104

350

214

530

323

990

604

1600

976

90’

160

98

320

195

490

299

930

567

1500

915

100’

150

92

305

186

460

281

870

531

1400

854

125’

130

79

275

168

410

250

780

476

1250

763

150’

120

73

250

153

380

232

710

433

1130

689

175’

110

67

225

137

350

214

650

397

1050

641

200’

100

61

210

128

320

195

610

372

980

598

Note: When sizing supply lines, consider possibilities of future expansion and increased requirements.

Refer to National Fuel Gas Code for additional information on line sizing.

WARNING: PRESSURE TESTING SUPPLY PIPING

Test Pressures Above 1/2 PSI: Disconnect the heater and manual

valve from the gas supply line which is to be tested. Cap or plug the

supply line.
Test Pressures Below 1/2 PSI: Before testing, close the manual valve

on the heater.

WARNING: All components of a gas supply system must be leak tested prior to

placing equipment in service. NEVER TEST FOR LEAKS WITH AN OPEN FLAME.

Failure to comply could result in personal injury, property damage or death.

NOTE: Gas

Conversion Kits are

available for changing

from propane to natural

gas or natural gas to

propane. A factory-

authorized conversion

kit

MUST be used.

WARNING: The operating valve is the prime safety shutoff. All gas supply lines must

be free of dirt or scale before connecting the heater to ensure positive closure. See

Hazard Levels, page 2.