A.O. Smith BTL-120, BTL-154, BTL-180, BTL-198, BTL-199 Installation Manual

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Instruction Manual

COMMERCIAL GAS WATER HEATERS

500 Tennessee Waltz Parkway

Ashland City, TN 37015

WARNING: If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury or death.

Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.

WHAT TO DO IF YOU SMELL GAS:

Do not try to light any appliance.

Do not touch any electrical switch; do not use any phone in your building.

Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions.

If you cannot reach your gas supplier, call the fire department.

Installation and service must be performed by a qualified installer, service agency or the gas supplier.

Thank you for buying this energy efficient water heater. We appreciate your confidence in our products.

MODELS

BTL 120, 154, 180, 198, 199, 250(A), 275(A), 310(A), 366(A), 400(A)

Ultra Low NOx SERIES 200

INSTALLATION - OPERATION - SERVICE - MAINTENANCE - LIMITED WARRANTY Complies with SCAQMD Low NOx Rule 1146.2

Read and understand this instruction manual and the safety messages herein before installing, operating or servicing this water heater.

Failure to follow these instructions and safety messages could result in death or serious injury.

This manual must remain with the water heater.

PLACE THESE INSTRUCTIONS ADJACENT TO HEATER AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.

PRINTED 0914

327502-005

TABLE OF CONTENTS

SAFE INSTALLATION, USE AND SERVICE.............................

3

APPROVALS..............................................................................

3

GENERAL SAFETY INFORMATION.........................................

4

Precautions...........................................................................

5

Grounding Instructions..........................................................

5

Hydrogen Gas Flammable....................................................

5

INTRODUCTION........................................................................

6

Abbreviations Used...............................................................

6

Qualifications........................................................................

6

Preparing for the Installation.................................................

6

FEATURES AND COMPONENTS.............................................

6

Controls................................................................................

6

The Eliminator (self-cleaning system)...................................

6

High Limit Switch..................................................................

7

Electronic Ignition Control.....................................................

7

Blower/Burner Assembly.......................................................

7

INSTALLATION CONSIDERATIONS.........................................

8

Rough In Dimensions...........................................................

8

Locating the Water Heater....................................................

9

Clearances............................................................................

9

NSF Leg Kit........................................................................

10

Insulation Blanket...............................................................

10

Hard Water.........................................................................

10

Circulation Pumps...............................................................

10

High Altitude Installations....................................................

11

INSTALLATION REQUIREMENTS..........................................

12

Gas Supply Systems..........................................................

12

Gas Pressure Requirements..............................................

12

Supply Gas Regulator.........................................................

12

Power Supply......................................................................

12

Water Temperature Control and Mixing Valves...................

12

Dishwashing Machines.......................................................

13

Closed Water Systems.......................................................

13

Thermal Expansion.............................................................

13

Temperature-Pressure Relief Valve....................................

13

Combustible Material Storage............................................

14

Contaminated Air................................................................

14

Air Requirements................................................................

15

Unconfined Space..............................................................

15

Confined Space..................................................................

15

Fresh Air Openings for Confined Spaces...........................

16

Outdoor Air Through Two Openings...................................

16

Outdoor Air Through One Opening.....................................

16

Outdoor Air Through Two Horizontal Ducts........................

16

Outdoor Air Through Two Vertical Ducts.............................

17

Air From Other Indoor Spaces............................................

17

VENTING INSTALLATION.......................................................

18

Venting................................................................................

18

Multiple Heater Manifold.....................................................

18

WATER HEATER INSTALLATION...........................................

21

Water Line Connections.....................................................

21

T&P Valve Discharge Pipe..................................................

21

Installation Diagrams - Top Inlet/Outlet Usage...................

22

Heater Wiring......................................................................

23

Gas Piping..........................................................................

24

Gas Line Leak Testing........................................................

24

Purging...............................................................................

24

START UP................................................................................

25

Prior to Start Up..................................................................

25

Initial Start Up.....................................................................

25

Checking Venting................................................................

26

Checking the Input..............................................................

26

Water Temperature Adjustment..........................................

26

SEQUENCE OF OPERATION.................................................

27

Lighting & Operating Label.................................................

27

Sequence of Operation Flow Chart....................................

28

MAINTENANCE ......................................................................

29

Venting System...................................................................

29

Intake Air Screen................................................................

29

Temperature-Pressure Relief Valve Test............................

29

Anode Rod Inspection........................................................

29

Draining and Flushing.........................................................

30

Periodic Removal of Lime Deposits fromTankType Commercial

Water Heaters.....................................................................

30

Deliming Solvents...............................................................

30

Tank Cleanout Procedure...................................................

31

Deliming Using Flo-Jug Method..........................................

31

SERVICE.................................................................................

32

Ignition Control System.......................................................

32

System Diagnostics............................................................

32

Electrical Servicing.............................................................

32

FOR YOUR INFORMATION....................................................

33

Start Up Conditions.............................................................

33

Operational Conditions.......................................................

33

TROUBLESHOOTING.............................................................

34

WATER PIPING DIAGRAMS...................................................

35

NOTES.....................................................................................

50

LIMITED WARRANTY..............................................................

51

2

SAFE INSTALLATION, USE AND SERVICE

The proper installation, use and servicing of this water heater is extremely important to your safety and the safety of others.

Many safety-related messages and instructions have been provided in this manual and on your own water heater to warn you and others of a potential injury hazard. Read and obey all safety messages and instructions throughout this manual. It is very important that the meaning of each safety message is understood by you and others who install, use, or service this water heater.

This is the safety alert symbol. It is used to alert you to potential personal injury hazards. Obey all safety messages that follow this symbol to avoid possible injury or death.

DANGER indicates an imminently

DANGER hazardous situation which, if not avoided, will result in injury or death.

WARNING indicates a potentially hazardous

WARNING situation which, if not avoided, could result in injury or death.

CAUTION indicates a potentially hazardous

CAUTION situation which, if not avoided, could result in minor or moderate injury.

CAUTION used without the safety alert CAUTION symbol indicates a potentially hazardous

situation which, if not avoided, could result in property damage.

All safety messages will generally tell you about the type of hazard, what can happen if you do not follow the safety message, and how to avoid the risk of injury.

The California Safe Drinking Water and Toxic Enforcement Act requires the Governor of California to publish a list of substances known to the State of California to cause cancer, birth defects, or other reproductive harm, and requires businesses to warn of potential exposure to such substances.

WARNING: This product contains a chemical known to the State of California to cause cancer, birth defects, or other reproductive harm. This appliance can cause low level exposure to some of the substances listed in the Act.

APPROVALS

3

A.O. Smith BTL-120, BTL-154, BTL-180, BTL-198, BTL-199 Installation Manual

GENERAL SAFETY INFORMATION

Fire or Explosion Hazard

Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.

Avoid all ignition sources if you smell gas.

Do not expose water heater controls to excessive gas pressure.

Use only the gas shown on the water heater rating label.

Maintain required clearances to combustibles.

Keep ignition sources away from faucets after extended periods of non-use.

Read instruction manual before installing, using or servicing water heater.

Fire Hazard

For continued protection against risk of fire:

Do not install water heater on carpeted floor.

Do not operate water heater if exposed to flooding or water damage.

Fire and Explosion Hazard

Use joint compound or Teflon tape compatible with propane gas.

Leak test before placing the water heater in operation.

Disconnect gas piping and main gas shutoff valve before leak testing.

Install sediment trap in accordance with NFPA 54.

CAUTION

Property Damage Hazard

All water heaters eventually leak.

Do not install without adequate drainage.

Electrical Shock Hazard

Turn off power to the water heater before performing any service.

Label all wires prior to disconnecting when performing service. Wiring errors can cause improper and dangerous operation.

Verify proper operation after servicing.

Failure to follow these instructions can result in personal injury or death.

Fire and Explosion Hazard

Do not use water heater with any gas other than the gas shown on the rating label.

Excessive gas pressure to gas valve can cause serious injury or death.

Turn off gas lines during installation.

Contact a qualified installer or service technician for installation and service.

Jumping out control circuits or components can result in property damage, personal injury or death.

Service should only be performed by a qualified service technician using proper test equipment.

Altering the water heater controls and/or wiring in any way could result in permanent damage to the controls or water heater and is not covered under the limited warranty.

Any bypass or alteration of the water heater controls and/or wiring will result in voiding the water heater warranty.

4

GENERAL SAFETY INFORMATION

Read and understand this instruction manual and the safety messages herein before installing, operating or servicing this water heater.

Failure to follow these instructions and safety messages could result in death or serious injury.

This manual must remain with the water heater.

Water temperature over 125°F (52°C) can cause severe burns instantly resulting in severe injury or death.

Children, the elderly and the physically or mentally disabled are at highest risk for scald injury.

Feel water before bathing or showering.

Temperature limiting devices such as mixing valves must be installed when required by codes and to ensure safe temperatures at fixtures.

Explosion Hazard

Overheated water can cause water tank explosion.

Properly sized temperature and pressure relief valve must be installed in the opening provided.

CAUTION

Improper installation, use and service may result in property damage.

Do not operate water heater if exposed to flooding or water damage.

Inspect anode rods regularly, replace if damaged.

Install in location with drainage.

Fill tank with water before operation.

Properly sized thermal expansion tanks are required on all closed water systems.

Refer to this manual for installation and service.

Verify the power to the water heater is turned off before performing any service procedures.

GENERAL SAFETY INFORMATION

PRECAUTIONS

DO NOT USE THIS WATER HEATER IF ANY PART HAS BEEN EXPOSED TO FLOODING OR WATER DAMAGE. Immediately call a qualified service technician to inspect the water heater and to make a determination on what steps should be taken next.

If the unit is exposed to the following, do not operate heater until all corrective steps have been made by a qualified service technician.

1.External fire.

2.Damage.

3.Firing without water.

GROUNDING INSTRUCTIONS

This water heater must be grounded in accordance with the National Electrical Code and/or local codes. These must be followed in all cases.

Thiswaterheatermustbeconnectedtoagroundedpermanent wiring system; or an equipment grounding conductor must be run with the circuit conductors and connected to the equipment grounding terminal or lead on the water heater, see Figure 20.

HYDROGEN GAS FLAMMABLE

Explosion Hazard

Flammable hydrogen gases may be present.

Keep all ignition sources away from faucet when turning on hot water.

Hydrogen gas can be produced in a hot water system served by this water heater that has not been used for a long period of time (generally two weeks or more). Hydrogen gas is extremely flammable. To reduce the risk of injury under these conditions, it is recommended that a hot water faucet served by this water heater be opened for several minutes before using any electrical appliance connected to the hot water system. If hydrogen is present there will probably be an unusual sound such as air escaping through the pipe as the water begins to flow. THERE SHOULD BE NO SMOKING OR OPEN FLAME NEAR THE FAUCET AT THE TIME IT IS OPEN.

5

INTRODUCTION

Thank You for purchasing this water heater. Properly installed and maintained, it should give you years of trouble free service.

ABBREVIATIONS USED

Abbreviations found in this Instruction Manual include :

ANSI - American National Standards Institute

ASME - American Society of Mechanical Engineers

AHRI - Air-Conditioning, Heating, and Refrigeration Institute

NEC - National Electrical Code

NFPA - National Fire Protection Association

UL - Underwriters Laboratory

CSA - Canadian Standards Association

QUALIFICATIONS

Qualified Installer or Service Agency

Installation and service of this water heater requires ability equivalent to that of a Qualified Agency (as defined by ANSI below) in the field involved. Installation skills such as plumbing, air supply, venting, gas supply and electrical supply are required in addition to electrical testing skills when performing service.

ANSI Z223.1 2012 Sec. 3.3.85: “Qualified Agency” - “Any individual, firm, corporation or company that either in person or through a representative is engaged in and is responsible for (1) the installation, testing or replacement of gas piping or (2) the connection, installation, testing, repair or servicing of appliances and equipment; that is experienced in such work; that is familiar with all precautions required; and that has complied with all the requirements of the authority having jurisdiction.”

If you are not qualified (as defined by ANSI above) and licensed or certified as required by the authority having jurisdiction to perform a given task do not attempt to perform any of the procedures described in this manual. If you do not understand the instructions given in this manual do not attempt to perform any procedures outlined in this manual.

PREPARING FOR THE INSTALLATION

1.Read the "General Safety Information" section, pages 4-5 of this manual first and then the entire manual carefully. If you don’t follow the safety rules, the water heater will not operate properly. It could cause DEATH, SERIOUS BODILY INJURY AND/OR PROPERTY DAMAGE.

This manual contains instructions for the installation, operation, and maintenance of the gas-fired water heater. It also contains warnings throughout the manual that you must read and be aware of. All warnings and all instructions are essential to the proper operation of the water heater and your safety. Since we cannot put everything on the first few pages, RE AD THE ENTIRE MANUAL BE FORE ATTEMPTING TO INSTALL OR OPERATE THE WATER HEATER.

2.The installation must conform with these instructions and the local code authority having jurisdiction. In the absence of local codes, the installation must comply with the current editions of the National Fuel Gas Code, ANSI Z223.1/NFPA 54 or CAN/ CSA-B149.1 the Natural Gas and Propane Installation Code. All documents are available from the Canadian Standards Association, 8501 East Pleasant Valley Road, Cleveland, OH 44131. NFPAdocuments are also available from the National Fire ProtectionAssociation, 1 Batterymarch Park, Quincy, MA02269.

3.If after reading this manual you have any questions or do not understand any portion of the instructions, call the local gas utility or the manufacturer whose name appears on the rating plate.

4.Carefully plan the place where you are going to put the water heater. Correct combustion, vent action, and vent pipe installation are very important in preventing death from possible carbon monoxide poisoning and fires.

Examine the location to ensure the water heater complies with the “Locating the Water Heater” section in this manual.

5.For California installation this water heater must be braced, anchored, or strapped to avoid falling or moving during an earthquake. See instructions for correct installation procedures. Instructions may be obtained from California Office of the State Architect, 400 P Street, Sacramento, CA 95814.

FEATURES AND COMPONENTS

CONTROLS

 

THE ELIMINATOR (SELF-CLEANING SYSTEM)

 

 

These units include The Eliminator (Self-Cleaning System)

 

 

installed in the front water inlet, see Figure 2. The Eliminator inlet

 

 

tube can only be used in the front water inlet connection. Do not

 

 

install the Eliminator inlet tube in either the top or back inlet water

 

 

connection. The Eliminator must be oriented correctly for proper

 

 

function. There is a marked range on the pipe nipple portion of

 

 

the Eliminator, that must be aligned with the top of the inlet spud.

 

 

A label above the jacket hole has an arrow that will point to the

 

 

marked portion of the pipe nipple if the orientation is correct. If

 

 

the arrow does not point within the marked range on the pipe

 

 

nipple, adjust the pipe nipple to correct. A pipe union is supplied

 

 

with the Eliminator to reduce the probability of misaligning the

 

 

Eliminator accidentally while tightening the connection to the

 

 

inlet water supply line. Improper orientation of the Eliminator

FIGURE 1.

 

can cause poor performance of the heater and can significantly

 

reduce outlet water temperatures during heavy draws.

6

Note: The Eliminator may have 1, 3 or 7 cross tubes. FIGURE 2.

HIGH LIMIT SWITCH

The digital thermostat (Figure 3) contains the high limit (energy cutout) switch. The high limit switch interrupts burner gas flow should the water temperature reach 203°F (95°C).

In the event of high limit switch operation, the water heater cannot be restarted unless the water temperature is reduced to approximately 120°F (49°C). The high limit reset button on the front of the control then needs to be depressed.

Continued manual resetting of high limit control, preceded by higher thanusualwatertemperatureisevidenceofhighlimitswitchoperation.

Contact your dealer or service agent if continued high limit switch operation occurs.

 

130

RESET

 

 

140

 

BUTTON

BLOWER/BURNER ASSEMBLY

The fan-assisted combustion system includes a spark-to-pilot igniter, 100% premix stainless steel burners, and prejets for input rate and precision air/gas ratio control.

2-BURNER / BLOWER ASSEMBLY (for Input of 199KBtu/H or Less)

LED

FUSE

LIGHTS

 

DIGITAL THERMOSTAT

FIGURE 3.

ELECTRONIC IGNITION CONTROL

Each heater is equipped with an ignition control. The solid state ignition control (Figure 4), ignites the burner by utilizing an intermittent spark-to-pilot igniter. Spark and pilot gas ON until lightoff or trial for ignition ends. If pilot fails to light, pilot gas and spark OFF (100% shutoff). After 5 minutes delay, a new trial for ignition is initiated. This sequence continues until lightoff or "Call

for Heat" is removed.

3-BURNER / BLOWER ASSEMBLY (for Input of 250KBtu/H or Higher)

FIGURE 5.

The intake air screen is attached to the inlet of the combustion blower. Inspect the intake air screen every six months. The intake air screen should be cleaned of any buildup of debris or foreign material.

IGNITION CONTROL

FIGURE 4.

7

INSTALLATION CONSIDERATIONS

ROUGH IN DIMENSIONS

FIGURE 6.

TABLE 1. ROUGH-IN-DIMENSIONS

MODEL DIM.

BTL-120, 154, 180, 198

BTL-199, 250(A), 275(A)

BTL-310(A), 366(A), 400(A)

inches

cm

inches

cm

inches

cm

 

A

633/4

161.93

713/4

182.25

713/4

182.25

B

37

93.98

37

93.98

37

93.98

C

65

165.1

73

18542

73

18542

D

523/4

133.99

603/4

154.31

603/4

154.31

E

203/4

52.71

201/2

52.07

201/2

52.07

F

21

53.34

21

53.34

21

53.34

G

3/4 NPT

 

3/4 NPT

 

3/4 NPT

 

H

53

134.62

61

154.94

61

154.94

I

6

15.24

6

15.24

6

15.24

J

273/4

70.49

273/4

70.49

273/4

70.49

K

1 1/2 NPT

 

1 1/2 NPT

 

1 1/2 NPT

 

L

1 1/2 NPT

 

1 1/2 NPT

 

1 1/2 NPT

 

M

-

-

8

20.3

8

20.3

Approx. Shipping Weight STD

650

295

750

341

810

367

Approx. Shipping Weight ASME

N/A

N/A

800

363

860

390

TABLE 2. RECOVERY CAPACITIES, BASED ON 80% THERMAL EFFICIENCY

Model

Input

 

Input

U.S.

 

Liters

 

Eff. %

 

 

 

 

 

U.S. Gallons/hr and Liters/hr at Temperature Rise Indicated

 

 

 

 

Kbtuh

 

Kw

Gal.

 

 

 

°C

20

22

 

28

30

33

 

39

40

44

50

 

56

60

61

 

67

70

 

72

78

 

 

 

 

 

 

 

 

 

 

 

°F

36

40

 

50

54

60

 

70

72

80

90

 

100

108

110

 

120

126

 

130

140

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BTL-120

120

 

 

 

81

 

 

 

80

GPH

320

288

 

230

213

192

 

165

160

144

128

 

115

107

105

 

96

91

 

89

82

 

 

35

 

 

 

307

 

 

LPH

1212

1091

 

872

808

727

 

623

606

545

485

 

436

404

397

 

364

346

 

336

312

BTL-154

154

 

 

 

81

 

 

 

80

GPH

411

370

 

296

274

246

 

211

205

185

164

 

148

137

134

 

123

117

 

114

106

 

 

45

 

 

 

307

 

 

LPH

1555

1399

 

1120

1037

933

 

800

777

700

622

 

560

518

509

 

466

444

 

431

400

BTL-180

180

 

 

 

81

 

 

 

80

GPH

480

432

 

346

320

288

 

247

240

216

192

 

173

160

157

 

144

137

 

133

123

 

 

53

 

 

 

307

 

 

LPH

1818

1636

 

1309

1212

1091

 

935

909

818

727

 

654

606

595

 

545

519

 

503

467

BTL-198

199

 

 

 

81

 

 

 

80

GPH

531

478

 

382

354

319

 

273

265

239

212

 

191

177

174

 

159

152

 

147

137

 

 

58

 

 

 

307

 

 

LPH

2009

1808

 

1447

1340

1206

 

1033

1005

904

804

 

723

670

658

 

603

574

 

556

517

BTL-199

199

 

 

 

100

 

 

 

80

GPH

531

478

 

382

354

319

 

273

265

239

212

 

191

177

174

 

159

152

 

147

137

 

 

58

 

 

 

378

 

 

LPH

2009

1808

 

1447

1340

1206

 

1033

1005

904

804

 

723

670

658

 

603

574

 

556

517

BTL-250(A)

250

 

 

 

100

 

 

 

80

GPH

667

600

 

480

445

400

 

343

333

300

267

 

240

222

218

 

200

191

 

185

171

 

 

73

 

 

 

378

 

 

LPH

2524

2272

 

1818

1683

1515

 

1298

1262

1136

1010

 

909

841

826

 

757

721

 

699

649

BTL-275(A)

275

 

 

 

100

 

 

 

80

GPH

734

660

 

528

489

440

 

377

367

330

293

 

264

245

240

 

220

210

 

203

189

 

 

81

 

 

 

378

 

 

LPH

2777

2499

 

1999

1851

1666

 

1428

1388

1250

1111

 

1000

926

909

 

833

793

 

769

714

BTL-310(A)

310

 

 

 

86

 

 

 

80

GPH

827

744

 

595

551

496

 

425

413

372

331

 

298

276

271

 

248

236

 

229

213

 

 

91

 

 

 

325

 

 

LPH

3130

2817

 

2254

2087

1878

 

1610

1565

1409

1252

 

1127

1043

1024

939

894

 

867

805

BTL-366(A)

366

 

 

 

86

 

 

 

80

GPH

976

879

 

703

651

586

 

502

488

439

391

 

352

325

320

 

293

279

 

270

251

 

 

107

 

 

325

 

 

LPH

3696

3326

 

2661

2464

2217

 

1901

1848

1663

1478

 

1330

1232

1209

1109

1056

 

1023

950

BTL-400(A)

390

 

 

 

86

 

 

 

80

GPH

1040

936

 

749

694

624

 

535

520

468

416

 

375

347

340

 

312

297

 

288

268

 

 

114

 

 

325

 

 

LPH

3938

3544

 

2835

2625

2363

 

2025

1969

1772

1575

 

1418

1313

1289

1181

1125

 

1091

1013

 

 

 

 

 

 

 

 

 

 

 

TABLE 3. GAS AND ELECTRICAL CHARACTERISTICS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Model

 

 

 

Gas Type

 

 

 

 

Gas Supply Pressure

 

 

 

 

 

Volts / Hz

 

 

 

Amperes

 

 

 

 

 

 

 

Minimum

 

 

 

Maximum

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

120 THRU 275(A)

 

 

 

 

Natural

 

 

3.5" W.C. (0.87 kPa)

 

 

14" W.C. (3.48 kPa)

 

 

 

120/60

 

 

 

<5

 

 

310(A) THRU 400(A)

 

 

 

Natural

 

 

4.5" WC (1.12 KPA)

 

 

14" W.C. (3.48 kPa)

 

 

 

120/60

 

 

 

<5

 

 

8

LOCATING THE WATER HEATER

CAUTION

Property Damage Hazard

All water heaters eventually leak.

Do not install without adequate drainage.

When installing the heater, consideration must be given to proper location. Location selected should be as close to the stack or chimney as practicable, with adequate air supply and as centralized with the piping system as possible.

Fire or Explosion Hazard

Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.

Avoid all ignition sources if you smell gas.

Do not expose water heater controls to excessive gas pressure.

Use only the gas shown on the water heater rating label.

Maintain required clearances to combustibles.

Keep ignition sources away from faucets after extended periods of non-use.

Read instruction manual before installing, using or servicing water heater.

There is a risk in using fuel burning appliances such as gas water heaters in rooms, garages or other areas where gasoline, other flammable liquids or engine driven equipment or vehicles are stored, operated or repaired. Flammable vapors are heavy and travel along the floor and may be ignited by the heater's igniter or main burner flames causing fire or explosion. Some local codes permit operation of gas appliances in such areas if they are installed 18" or more above the floor. This may reduce the risk if location in such an area cannot be avoided.

Do not install this water heater directly on a carpeted floor. A fire hazard may result. Instead the water heater must be placed on a metal or wood panel extending beyond the full width and depth by at least 3 inches in any direction. If the

heater is installed in a carpeted alcove, the entire floor shall be covered by the panel.

The heater shall be located or protected so it is not subject to physical damage by a moving vehicle.

Flammable items, pressurized containers or any other potential fire hazardous articles must never be placed on or adjacent to the heater. Open containers or flammable material should not be stored or used in the same room with the heater.

The heater must not be located in an area where it will be subject to freezing.

Locate it near a floor drain. The heater should be located in an area where leakage from heater or connections will not result in damage to adjacent area or to the lower floors of the structure.

When such locations cannot be avoided, a suitable drain pan should be installed under heater. Such pans should be fabricated with sides at least 2” deep, with length and width at least 2” greater than diameter of heater and must be piped to an adequate drain. Pan must not restrict combustion air flow.

CLEARANCES

This water heater is approved for installation on combustible flooring in an alcove with minimum clearance from combustion construction as indicated in Figure 7 and Table 4.

In all installations the minimum combustible clearances from vent piping shall be 6” (15.2 cm). Vent piping passing through a combustible wall or ceiling must be a continuous run (no joints) and retain 6” (15.2 cm) clearance unless an approved reducing thimble is used.

When the water heater is installed directly on carpeting, the water heater shall be installed on a metal or wood panel extending beyond the full width and depth of the water heater by at least 3 in (76.2 mm) in any direction or, if the water heater is installed in an alcove or closet, the entire floor shall be covered by the panel. The panel must be strong enough to carry the weight of the heater when full of water.

A service clearance of at least 24” (61 cm) should be maintained from serviceable parts.

TABLE 4. MINIMUM CLEARANCES TO COMBUSTIBLE OR NON-COMBUSTIBLE CONSTRUCTION

Model

"A" Right Side

"B" Left Side

"C" Back

"D" Ceiling

 

0"

0"

0"

12"

All

 

 

 

 

0 cm

0 cm

0 cm

30.5 cm

 

 

 

 

 

 

9

FIGURE 7.

NSF LEG KIT

FIGURE 8.

The NSF Leg Kit (part number 9008883005) is needed only for applications that must conform to NSF/ANSI Standard 5. The installed height of the water heater will increase by 4" (10.2 cm) when the leg kit is installed. Follow these steps to install the Leg Kit. Use caution to prevent damage to the unit when installing the Leg Kit

1.Lift, tilt or lay the unit on its side to access the bottom of the legs.

2.Position the extension under leg aligning the holes in the leg extension with the holes in the leg. Assemble the bolt, bevel washers, flat washers, and nut through the aligned holes in the leg and leg extension as shown in Figure 8.

INSULATION BLANKET

Breathing Hazard - Carbon Monoxide Gas

Do not obstruct water heater air intake

with insulating blanket.

Gas and carbon monoxide detectors

are available.

Install water heater in accordance with

the instruction manual.

Breathing carbon monoxide can cause brain damage or death. Always read and understand instruction manual.

Insulation blankets are available to the general public for external use on gas water heaters but are not necessary with these products. The purpose of an insulation blanket is to reduce the standby heat loss encountered with storage tank heaters. The water heaters covered by this manual meet or exceed the Energy Policy Act standards with respect to insulation and standby heat loss requirements, making an insulation blanket unnecessary.

Should you choose to apply an insulation blanket to this heater, you should follow these instructions. See the Features and Components section of this manual for identification of components mentioned below. Failure to follow these instructions can restrict the air flow required for proper combustion, potentially resulting in fire, asphyxiation, serious personal injury or death.

DO NOT apply insulation to the front of the combustion chamber flange plate to insure that the spark igniter, flame sensor, and sightglass remain uncovered.

DO NOT cover the gas control valve or the TemperaturePressure Relief Valve.

DO NOT apply insulation within 5” (13 cm) of the blower, to insure the safe operation of the blower assembly.

DO NOT apply insulation on the control box that encloses the thermostat, ignition control, and variable frequency drive.

DO NOT cover the instruction manual. Keep it on the side of the water heater or nearby for future reference.

DO obtain new warning and instruction labels from the manufacturer for placement on the blanket directly over the existing labels.

DO inspect the insulation blanket frequently to make certain it does not sag, thereby obstructing combustion air flow.

HARD WATER

Where hard water conditions exist, water softening or the threshold type of water treatment is recommended. This will protect the dishwashers, coffee urns, water heaters, water piping and other equipment.

See the Maintenance Section in this manual for sediment and lime scale removal procedures.

CIRCULATION PUMPS

A circulating pump is used when a system requires a circulating loop or there is a storage tank used in conjunction with the water heater. See Water Piping Diagrams in this manual for installation location of circulating pumps.

See the Circulation Pump Wiring Diagrams (Figure 9.) in this manual for electrical hookup information. Install in accordance

3.Once in place, tighten the nut and bolt assembly. Torque to 70 with the current edition of the National Electrical Code, NFPA 70

ft.lbs (9.67 kgf-m).

4.Insure that all four nut and bolt assemblies are torqued to the specified value before placing the unit on the floor.

or the Canadian Electrical Code, CSA C22.1.

Stainless steel circulating pumps are recommended for use with commercial water heaters.

10

Some circulating pumps are manufactured with sealed bearings and do not require further lubrication. Some circulating pumps must be periodically oiled. Refer to the pump manufacturer’s instructions for lubrication requirements.

CIRCULATING PUMP WIRING DIAGRAM

STORAGE TANK OR BUILDING RECIRCULATION

FIELD SUPPLIED TEMPERATURE CONTROL INSTALLED IN THE STORAGE TANK

OR CIRCULATING LOOP RETURN LINE

NOTE: USE SEPARATE 120 VAC POWER

SUPPLY FOR PUMP CIRCUIT. DO NOT SHARE POWER WITH WATER HEATER AS THIS MAY CAUSE ELECTRICAL LINE NOISE AND LEAD TO ERRATIC CONTROL SYSTEM OPERATION.

L1 HOT

120 VAC

CIRC

POWER

PUMP

 

MOTOR

L2 NEUTRAL

CIRCULATING PUMP WIRING DIAGRAM

DISHWASHER LOOP WITH TOGGLE SWITCH

DISHWASHER

TOGGLE

SWITCH

NOTE: USE SEPARATE 120 VAC POWER SUPPLY FOR PUMP CIRCUIT. DO NOT SHARE POWER WITH WATER HEATER AS THIS MAY CAUSE ELECTRICAL LINE NOISE AND LEAD TO ERRATIC CONTROL SYSTEM OPERATION.

L1 HOT

120 VAC POWER

L2 NEUTRAL

FIELD SUPPLIED TEMPERATURE CONTROL INSTALLED IN THE CIRCULATING LOOP RETURN LINE

CIRC

PUMP

MOTOR

FIGURE 9.

HIGH ALTITUDE INSTALLATIONS

Fire and Explosion Hazard

Under no circumstances should the input exceed the rate shown on the water heater’s rating label.

Overfiring could result in fire or explosion.

Gas and carbon monoxide detectors are available.

Breathing Hazard - Carbon Monoxide Gas

Under no circumstances should the input exceed the rate shown on the water heater’s rating label.

Special consideration must be taken with installations above 10,100’ (3078m) for standard models.

Overfiring could result in damage to the water heater and sooting.

Gas and carbon monoxide detectors are available.

Breathing carbon monoxide can cause brain damage or death. Always read and understand instruction manual.

The water heaters covered by this manual are certified for use without modification for an altitude of 10,100 feet (3,078 m). Consult the factory for installation at altitudes over 10,100 feet (3,078 m).

Some gas utility companies derate their gas for altitude, making it unnecessary to install high altitude orifices. Call the local gas or utility company to verify BTU content.

Due to the input rate reduction at high altitudes, the output rating of the water heater is also reduced and should be compensated for in the sizing of the equipment for applications.

11

INSTALLATION REQUIREMENTS

GAS SUPPLY SYSTEMS

Low pressure building gas supply systems are defined as those systems that cannot under any circumstances exceed 14” W.C. (3.49 kPa) (1/2 PSI Gauge). These systems do not require pressure regulation. Measurements should be taken to insure that gas pressures are stable and fall within the requirements stated on the water heater rating plate. Readings should be taken with all gas burning equipment off (static pressure) and with all gas burning equipment running at maximum rate (dynamic pressure). The gas supply pressure must be stable within 1.5” W.C. (0.37 kPa) from static to dynamic pressure to provide good performance. Pressure drops that exceed 1.5” W.C. (0.37 kPa) may cause rough starting, noisy combustion or nuisance outages. Increases or spikes in static pressure during off cycles may cause failure to ignite or in severe cases damage to appliance gas valves. If your low pressure system does NOT meet these requirements, the installer is responsible for the corrections.

High Pressure building supply systems use pressures that exceed 14” W.C. (3.49 kPa) (1/2 PSI Gauge). These systems must use field supplied regulators to lower the gas pressure to less than 14” W.C. (3.49 kPa) (1/2 PSI Gauge). Appliances require gas regulators that are properly sized for the water heater input and deliver the rating plate specified pressures. Gas supply systems where pressure exceeds 5 PSI (34.5 kPa) often require multiple regulators to achieve desired pressures. Systems in excess of 5 PSI building pressure should be designed by gas delivery professionals for best performance. Water heaters connected to gas supply systems that exceed 14” W.C. (3.49 kPa) (1/2 PSI Gauge) at any time must be equipped with a gas supply regulator.

GAS PRESSURE REQUIREMENTS

All models require a minimum gas supply pressure as shown in Table 3 on page 8. The minimum supply pressure is measured while gas is flowing (dynamic pressure). The supply pressure (dynamic) should never fall below that indicated in Table 3 page 8. The supply pressure should be measured with all gas fired appliances connected to the common main firing at full capacity. If the supply pressure drops more than 1.5” W.C. (0.37 kPa) as gas begins to flow to the water heater then the supply gas system including the gas line and/or the gas regulator may be restricted or undersized. See Supply Gas Regulator section and Gas Piping section of this manual.

The gas control valve on all models has a maximum gas supply pressure limit of 14" W.C. (3.48 kPa). The maximum supply pressure is measured while gas is not flowing (static pressure).

SUPPLY GAS REGULATOR

The maximum allowable gas supply pressure for this water heater is 14 inches W.C. (3.48 kPa). Install a positive lock-up gas pressure regulator in the gas supply line if inlet gas pressure can exceed 14 inches W.C. (3.48 kPa) at any time. Regulators must be sized/used according to manufacturer's specifications.

If a positive lock-up regulator is required follow these instructions:

1.Positive lock-up gas pressure regulators must be rated at or above the input Btu/hr rating of the water heater they supply.

2.Supply gas regulators shall have inlet and outlet connections not less than the minimum supply gas line size for the water heater they supply. See Table 7 on page 24.

3.Positive lock-up gas pressure regulator(s) should be installed no closer than 3 feet (1 meter) and no farther than 8 feet (2.4 meters) of equivalent length from the water heater’s inlet gas connection.

4.After installing the positive lock-up gas pressure regulator(s) an initial nominal supply pressure setting of 7.0” W.C. (1.74 kPa) while the water heater is operating is recommended and will generally provide good water heater operation.

Some addition adjustment maybe required later to maintain a steady gas supply pressure.

5.When installing multiple water heaters in the same gas supply system it is recommended that individual positive lock-up gas pressure regulators be installed at each unit.

POWER SUPPLY

The water heaters covered in this manual require a 120 VAC, 1Ø (single phase), 60Hz, 15 amp power supply and must also be electrically grounded in accordance with local codes or, in the absence of local codes, with the National Electrical Code, ANSI/ NFPA 70 or the Canadian Electrical Code, CSA C22.1.

WATER TEMPERATURE CONTROL AND MIXING VALVES

Water temperature over 125°F (52°C) can cause severe burns instantly resulting in severe injury or death.

Children, the elderly and the physically or mentally disabled are at highest risk for scald injury.

Feel water before bathing or showering.

Temperature limiting devices such as mixing valves must be installed when required by codes and to ensure safe temperatures at fixtures.

Water heated to a temperature which will satisfy clothes washing, dish washing, and other sanitizing needs can scald and cause permanent injury upon contact. Short repeated heating cycles caused by small hot water uses can cause temperatures at the point of use to exceed the water heater’s temperature setting by up to 20°F (11°C).

Some people are more likely to be permanently injured by hot water than others. These include the elderly, children, the infirm and the physically/mentally disabled. Table 5 shows the approximate time-to-burn relationship for normal adult skin. If anyone using hot water provided by the water heater being installed fits into one of these groups or if there is a local code or state law requiring a certain water temperature at the point of use, then special precautions must be taken.

In addition to using the lowest possible temperature setting that satisfies the demand of the application a Mixing Valve should be installed at the water heater (see Figure 10) or at the hot water taps to further reduce system water temperature.

Mixing valves are available at plumbing supply stores. Consult a Qualified Installer or Service Agency. Follow mixing valve manufacturer’s instructions for installation of the valves.

TABLE 5.

Water Temperature

Time for 1st Degree Burn

Time for Permanent Burns

°F (°C)

(Less Severe Burns)

2nd & 3rd Degree

(Most Severe Burns)

 

 

110 (43)

(normal shower temp.)

 

 

 

 

116 (47)

(pain threshold)

 

 

 

 

116 (47)

35 minutes

45 minutes

 

 

 

122 (50)

1 minute

5 minutes

 

 

 

131 (55)

5 seconds

25 seconds

 

 

 

140 (60)

2 seconds

5 seconds

 

 

 

149 (65)

1 second

2 seconds

 

 

 

154 (68)

instantaneous

1 second

 

 

 

(U.S. Government Memorandum, C.P.S.C., Peter L. Armstrong, Sept. 15, 1978)

12

HOT WATER

OUTLET

12” TO 15” (30-38 cm)

TEMPERED WATER

OUTLET

COLD

 

CHECK

WATER

 

VALVE

INLET

 

MIXING

 

CHECK

 

VALVE

 

VALVE

 

 

 

TO TANK

 

INLET

FIGURE 10.

DISHWASHING MACHINES

All dishwashing machines meeting the National Sanitation Foundation requirements are designed to operate with water flow pressures between 15 and 25 pounds per square inch (103 kPa and 173 kPa). Flow pressures above 25 pounds per square inch (173 kPa), or below 15 pounds per square inch (103 kPa), will result in improperly sanitized dishes. Where pressures are high, a water pressure reducing or flow regulating control valve should be used in the 180°F (82°C) line to the dishwashing machine and should be adjusted to deliver water pressure between these limits.

The National Sanitation Foundation also recommends circulation of 180°F (82°C) water. The circulation should be just enough to provide 180°F (82°C) water at the point of take-off to the dishwashing machine.

Adjust flow by throttling a full port ball valve installed in the circulating line on the outlet side of the pump. Never throttle flow on the suction side of a pump. See Water Piping Diagrams in this manual.

CLOSED WATER SYSTEMS

Water supply systems may, because of code requirements or such conditions as high line pressure, among others, have installed devices such as pressure reducing valves, check valves, and back flow preventers. Devices such as these cause the water system to be a closed system.

THERMAL EXPANSION

As water is heated, it expands (thermal expansion). In a closed system the volume of water will grow when it is heated. As the volume of water grows there will be a corresponding increase in water pressure due to thermal expansion. Thermal expansion can cause premature tank failure (leakage). This type of failure is not covered under the limited warranty. Thermal expansion can also cause intermittent Temperature-Pressure Relief Valve operation: water discharged from the valve due to excessive pressure build up. This condition is not covered under the limited warranty. The Temperature-Pressure Relief Valve is not intended for the constant relief of thermal expansion.

A properly sized thermal expansion tank must be installed on all closed systems to control the harmful effects of thermal

expansion. Contact a local plumbing service agency to have a thermal expansion tank installed.

See Water Line Connections on page 21 and Water Piping Diagrams starting on page 35.

TEMPERATURE-PRESSURE RELIEF VALVE

Explosion Hazard

Temperature-Pressure Relief Valve must comply with ANSI Z21.22CSA 4.4 and ASME code.

Properly sized temperaturepressure relief valve must be installed in opening provided.

Can result in overheating and excessive tank pressure.

Can cause serious injury or death.

This water heater is provided with a properly rated/sized and certified combination Temperature-Pressure Relief Valve (T&P valve) by the manufacturer. The valve is certified by a nationally recognized testing laboratory that maintains periodic inspection of production of listed equipment of materials as meeting the requirements for Relief Valves for Hot Water Supply Systems, ANSI Z21.22 • CSA 4.4, and the code requirements of ASME.

If replaced, the new T&P valve must meet the requirements of local codes, but not less than a combination TemperaturePressure Relief Valve rated/sized and certified as indicated in the above paragraph. The new valve must be marked with a maximum set pressure not to exceed the marked hydrostatic working pressure of the water heater (150 psi = 1,035 kPa) and a discharge capacity not less than the water heater Btu/hr or kW input rate as shown on the water heater’s model rating label.

NOTE: In addition to the factory installed Temperature-Pressure Relief Valve on the water heater, each remote storage tank that may be installed and piped to a water heating appliance must also have its own properly sized, rated and approved TemperaturePressure Relief Valve installed. Call the toll free technical support phone number listed on the back cover of this manual for technical assistance in sizing a Temperature-Pressure Relief Valve for remote storage tanks.

For safe operation of the water heater, the Temperature-Pressure Relief Valve must not be removed from its designated opening nor plugged. The Temperature-Pressure Relief Valve must be installed directly into the fitting of the water heater designed for the relief valve. Install discharge piping so that any discharge will exit the pipe within 6 inches (15.2 cm) above an adequate floor drain, or external to the building. In cold climates it is recommended that it be terminated at an adequate drain inside the building. Be certain that no contact is made with any live electrical part. The discharge opening must not be blocked or reduced in size under any circumstances. Excessive length, over 30 feet (9.14 m), or use of more than four elbows can cause restriction and reduce the discharge capacity of the valve.

13

No valve or other obstruction is to be placed between the Temperature-Pressure Relief Valve and the tank. Do not connect discharge piping directly to the drain unless a 6” (15.2 cm) air gap is provided. To prevent bodily injury, hazard to life, or property damage, the relief valve must be allowed to discharge water in adequate quantities should circumstances demand. If the discharge pipe is not connected to a drain or other suitable means, the water flow may cause property damage.

see Closed Water Systems and Thermal Expansion on page 13.

If you do not understand these instructions or have any questions regarding the Temperature-Pressure Relief Valve call the toll free number listed on the back cover of this manual for technical assistance.

COMBUSTIBLE MATERIAL STORAGE

CAUTION

Water Damage Hazard

Temperature-Pressure Relief Valve discharge pipe must terminate at adequate drain.

T&P Valve Discharge Pipe Requirements:

Shall not be smaller in size than the outlet pipe size of the valve, or have any reducing couplings or other restrictions.

Shall not be plugged or blocked.

Shall not be exposed to freezing temperatures.

Shall be of material listed for hot water distribution.

Shall be installed so as to allow complete drainage of both the Temperature-Pressure Relief Valve and the discharge pipe.

Must terminate a maximum of six inches above a floor drain or external to the building. In cold climates, it is recommended that the discharge pipe be terminated at an adequate drain inside the building.

Shall not have any valve or other obstruction between the relief valve and the drain.

Burn hazard.

Hot water discharge.

Keep clear of TemperaturePressure Relief Valve discharge outlet.

Fire or Explosion Hazard

Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.

Avoid all ignition sources if you smell gas.

Do not expose water heater controls to excessive gas pressure.

Use only the gas shown on the water heater rating label.

Maintain required clearances to combustibles.

Keep ignition sources away from faucets after extended periods of non-use.

Read instruction manual before installing, using or servicing water heater.

Keep water heater area clear and free of combustible materials, gasoline and other flammable vapors and liquids.

CONTAMINATED AIR

Breathing Hazard - Carbon Monoxide Gas

Install water heater in accordance with the Instruction Manual and NFPA 54 or CAN/CSA-B149.1.

To avoid injury, combustion and ventilation air must be taken from outdoors.

Do not place chemical vapor emitting products near water heater.

Breathing carbon monoxide can cause brain damage or death. Always read and understand instruction manual.

The Temperature-Pressure Relief Valve must be manually operated at least twice a year. Caution should be taken to ensure that (1) no one is in front of or around the outlet of the Temperature-Pressure Relief Valve discharge line, and (2) the water manually discharged will not cause any bodily injury or property damage because the water may be extremely hot. If after manually operating the valve, it fails to completely reset and continues to release water, immediately close the cold water inlet to the water heater, follow the draining instructions in this manual, and replace the Temperature-Pressure Relief Valve with a properly rated/sized new one.

NOTE: The purpose of a Temperature-Pressure Relief Valve is to prevent excessive temperatures and pressures in the storage tank. The T&P valve is not intended for the constant relief of thermal expansion.Aproperly sized thermal expansion tank must be installed on all closed systems to control thermal expansion,

Corrosion of the flue ways and vent system may occur if air for combustion contains certain chemical vapors. Such corrosion may result in failure and risk of asphyxiation.

Combustion air that is contaminated can greatly diminish the life span of the water heater and water heater components such as igniters and burners. Propellants of aerosol sprays, beauty shop supplies, water softener chemicals and chemicals used in dry cleaning processes that are present in the combustion, ventilation or ambient air can cause such damage.

Do not store products of this sort near the water heater. Air which is brought in contact with the water heater should not contain any of these chemicals. If necessary, uncontaminated air should be obtained from remote or outdoor sources. The limited warranty is voided when failure of water heater is due to a corrosive atmosphere. (See limited warranty for complete terms and conditions).

14

AIR REQUIREMENTS

Breathing Hazard - Carbon Monoxide Gas

Install water heater in accordance with the Instruction Manual and NFPA 54 or CAN/CSA-B149.1.

To avoid injury, combustion and ventilation air must be taken from outdoors.

Do not place chemical vapor emitting products near water heater.

Breathing carbon monoxide can cause brain damage or death. Always read and understand instruction manual.

For safe operation an adequate supply of fresh uncontaminated air for combustion and ventilation must be provided.

An insufficient supply of air can cause recirculation of combustion products resulting in contamination that may be hazardous to life. Such a condition often will result in a yellow, luminous burner flame, causing sooting of the combustion chamber, burners and flue tubes and creates a risk of asphyxiation.

Do not install the water heater in a confined space unless an adequate supply of air for combustion and ventilation is brought in to that space using the methods described in the Confined Space section that follows.

Never obstruct the flow of ventilation air. If you have any doubts or questions at all, call your gas supplier. Failure to provide the proper amount of combustion air can result in a fire or explosion and cause property damage, serious bodily injury or death.

UNCONFINED SPACE

An Unconfined Space is one whose volume IS NOT LESS THAN 50 cubic feet per 1,000 Btu/hr (4.8 cubic meters per kW) of the total input rating of all appliances installed in the space. Rooms communicating directly with the space, in which the appliances are installed, through openings not furnished with doors, are considered a part of the unconfined space.

Makeup air requirements for the operation of exhaust fans, kitchen ventilation systems, clothes dryers and fireplaces shall also be considered in determining the adequacy of a space to

provide combustion, ventilation and dilution air.

Unusually Tight Construction

In unconfined spaces in buildings, infiltration may be adequate to provide air for combustion, ventilation and dilution of flue gases. However, in buildings of unusually tight construction (for example, weather stripping, heavily insulated, caulked, vapor barrier, etc.) additional air must be provided using the methods described in the Confined Space section that follows.

CONFINED SPACE

A Confined Space is one whose volume IS LESS THAN 50 cubic feet per 1,000 Btu/hr (4.8 cubic meters per kW) of the total input rating of all appliances installed in the space.

Openings must be installed to provide fresh air for combustion, ventilation and dilution in confined spaces. The required size for the openings is dependent on the method used to provide fresh air to the confined space AND the total Btu/hr input rating of all appliances installed in the space.

Exhaust Fans

Where exhaust fans are installed, additional air shall be provided to replace the exhausted air. When an exhaust fan is installed in the same space with a water heater, sufficient openings to provide fresh air must be provided that accommodate the requirements for all appliances in the room and the exhaust fan. Undersized openings will cause air to be drawn into the room through the water heater’s vent system causing poor combustion. Sooting, serious damage to the water heater and the risk of fire or explosion may result. It can also create a risk of asphyxiation.

Louvers and Grilles

The free areas of the fresh air openings in the instructions that follow do not take in to account the presence of louvers, grilles or screens in the openings.

The required size of openings for combustion, ventilation and dilution air shall be based on the “net free area” of each opening. Where the free area through a design of louver or grille or screen is known, it shall be used in calculating the size of opening required to provide the free area specified. Where the louver and grille design and free area are not known, it shall be assumed that wood louvers will have 25% free area and metal louvers and grilles will have 75% free area. Non motorized louvers and grilles shall be fixed in the open position.

15

FRESH AIR OPENINGS FOR CONFINED SPACES

The following instructions shall be used to calculate the size, number and placement of openings providing fresh air for combustion, ventilation and dilution in confined spaces. The illustrations shown in this section of the manual are a reference for the openings that provide fresh air into confined spaces only. DO NOT refer to these illustrations for the purpose of vent installation. See Venting Installation on page 18 for complete venting installation instructions.

OUTDOOR AIR THROUGH TWO OPENINGS

FIGURE 14.

The confined space shall be provided with two permanent openings, one commencing within 12 inches (300 mm) of the top and one commencing within 12 inches (300 mm) of the bottom of the enclosure. The openings shall communicate directly with the outdoors. See Figure 14.

Each opening shall have a minimum free area of 1 square inch per 4,000 Btu/hr (550 mm2 per kW) of the aggregate input rating of all appliances installed in the enclosure. Each opening shall not be less than 100 square inches (645 cm2).

OUTDOOR AIR THROUGH ONE OPENING

FIGURE 15.

Alternatively a single permanent opening, commencing within 12 inches (300 mm) of the top of the enclosure, shall be provided. See Figure 14. The water heater shall have clearances of at least 1 inch (25 mm) from the sides and back and 6 inches (l50 mm) from the front of the appliance. The opening shall directly communicate with the outdoors or shall communicate through a vertical or horizontal duct to the outdoors or spaces that freely communicate with the outdoors and shall have a minimum free area of the following:

1.1 square inch per 3000 Btu/hr (733 mm2 per kW) of the total input rating of all appliances located in the enclosure, and

2.Not less than the sum of the areas of all vent connectors in the space.

OUTDOOR AIR THROUGH TWO HORIZONTAL DUCTS

FIGURE 16.

The confined space shall be provided with two permanent horizontal ducts, one commencing within 12 inches (300 mm) of the top and one commencing within 12 inches (300 mm) of the bottom of the enclosure. The horizontal ducts shall communicate directly with the outdoors. See Figure 16.

Each duct opening shall have a minimum free area of 1 square inch per 2,000 Btu/hr (1100 mm2 per kW) of the aggregate input rating of all appliances installed in the enclosure.

When ducts are used, they shall be of the same cross sectional area as the free area of the openings to which they connect. The minimum dimension of rectangular air ducts shall be not less than 3 inches (7.6 cm).

16

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