Lochinvar FBN0751, FBN1001, FBN1251, FBN1501, FBN1751 Installation Manual

...
0 (0)

100208043_2000004587_Rev Y

Installation & Operation Manual

Models: 751 - 6001

Series: 100 - 101 & 110 - 111

WARNING This manual must only be used by a qualified heating installer / service

technician. Read all instructions, including this manual and the Crest Service Manual, before installing.

Perform steps in the order given. Failure to comply could result in severe personal injury, death, or substantial property damage.

Save this manual for future reference.

Contents

HAZARD DEFINITIONS ..................................................

2

PLEASE READ BEFORE PROCEEDING.....................

3

THE CREST -- HOW IT WORKS.................................

4-5

RATINGS ..........................................................................

6

1. DETERMINE BOILER LOCATION

 

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

7

Provide Air Openings to Room ..........................................

8

Flooring and Foundation...................................................

8

Vent and Air Piping ............................................................

8

Prevent Combustion Air Contamination.............................

8

Using an Existing Vent System to Install a New Boiler

..... 9

Corrosive Contaminants and Sources ...............................

9

Removing a Boiler from Existing Common Vent..............

10

Remove Boiler from Wood Pallet.....................................

11

Combustion and Ventilation Air Requirements...........

12-13

2. GENERAL VENTING

 

Direct Venting Options - Sidewall Vent............................

14

Direct Venting Options - Vertical Vent ..............................

14

Direct Venting Options - Vert. Vent, Opt. Rm Air.............

14

Direct Venting Options - Vert. Vent, Sidewall Air.............

14

Install Vent and Combustion Air Piping ...........................

15

Air Inlet Pipe Materials................................................

15

Vent and Air Piping ..........................................................

16

Air Intake / Vent Connections ..........................................

16

Min./Max. Combustion Air & Vent Piping Lengths...........

18

Vent and Air Piping ..........................................................

19

Common Venting .............................................................

20

PVC/CPVC..................................................................

20-21

Polypropylene...................................................................

22

3. VERTICAL DIRECT VENTING

 

Vent/Air Termination - Vertical.........................................

23

Determine Location.....................................................

23

Prepare Roof Penetrations.........................................

23

Termination and Fittings........................................

23-24

Multiple Vent/Air Terminations....................................

24

4. SIDEWALL DIRECT VENTING

 

Vent/Air Termination - Sidewall...................................

25-27

Determine Location................................................

25-27

Prepare Wall Penetrations..........................................

27

Termination and Fittings.............................................

 

27

Multiple Vent/Air Terminations...............................

 

27-28

Room Air.....................................................................

 

28

5. HYDRONIC PIPING

 

 

System Water Piping Methods.........................................

 

29

Low Water Cutoff Device .................................................

 

29

Chilled Water System.......................................................

 

29

Freeze Protection.............................................................

 

29

General Piping Information ..............................................

 

29

Circulator Sizing...............................................................

 

30

Near Boiler Piping Components.......................................

 

32

6. GAS CONNECTIONS

 

 

Connecting Gas Supply Piping ........................................

 

37

Natural Gas......................................................................

 

38

Pipe Sizing for Natural Gas........................................

 

38

Natural Gas Supply Pressure Requirements

............. 38

Propane Gas....................................................................

 

38

Pipe Sizing for Propane Gas......................................

 

38

Propane Supply Pressure Requirements...................

38

Check Inlet Gas Supply ..............................................

 

39-40

Gas Valve Replacement ..................................................

 

40

7. FIELD WIRING

 

 

Line Voltage Connections................................................

 

41

Low Voltage Connections ................................................

 

42

Wiring of the Cascade......................................................

 

43

8. CONDENSATE DISPOSAL

 

 

Condensate Drain ............................................................

 

45

9. STARTUP ...............................................................

 

46-54

10. OPERATING INFORMATION

 

 

General........................................................................

 

55-57

Cascade...........................................................................

 

58

Sequence of Operation....................................................

 

59

Home Screen ...................................................................

 

60

11. MAINTENANCE

 

 

Maintenance & Annual Startup..............................

 

61-65

12. DIAGRAMS

 

 

Ladder Diagrams.................................

66,68,70, and 72

Wiring Diagrams..................................

67,69,71, and 73

Revision Notes..................................................

 

Back Cover

Hazard definitions

The following defined terms are used throughout this manual to bring attention to the presence of hazards of various risk levels or to important information concerning the life of the product.

DANGER

WARNING

CAUTION

CAUTION

NOTICE

DANGER indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.

WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

CAUTION indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury.

CAUTION used without the safety alert symbol indicates a potentially hazardous situation which, if not avoided, may result in property damage.

NOTICE indicates special instructions on installation, operation, or maintenance that are important but not related to personal injury or property damage.

2

Installation & Operation Manual

Please read before proceeding

WARNING

Installer – Read all instructions, including

this manual and the Crest Service Manual,

 

 

before installing. Perform steps in the

 

order given.

 

 

User

This manual is for use only

 

by a

qualified

heating installer/

 

service technician. Refer to the User’s

 

Information Manual for your reference.

 

Have

this boiler

serviced/inspected by

a qualified service technician, at least annually.

Failure to comply with the above could result in severe personal injury, death or substantial property damage.

WARNING 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.

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

When servicing boiler –

NOTICE

When calling or writing about the boiler

– Please have the boiler model and serial

 

 

number from the boiler rating plate.

 

Consider piping and installation when

 

determining boiler location.

 

Any claims for damage or shortage in

 

shipment must be filed immediately

 

against the transportation company by

 

the consignee.

 

Factory warranty (shipped with unit) does

 

not apply to units improperly installed or

 

improperly operated.

WARNING

WARNING

WARNING

Failure to adhere to the guidelines on this page can result in severe personal injury, death, or substantial property damage.

If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury or loss of life.

This appliance MUST NOT be installed in any location where gasoline or flammable vapors are likely to be present.

WHAT TO DO IF YOU SMELL GAS

Do not try to light any appliance.

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

Immediately call your gas supplier from a near by 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.

DO NOT install units in rooms or environments that contain corrosive contaminants (see Table 1A on page 9). Failure to comply could result in severe personal injury, death, or substantial property damage.

To avoid electric shock, disconnect electrical supply before performing maintenance.

To avoid severe burns, allow boiler to cool before performing maintenance.

Boiler operation –

Do not block flow of combustion or ventilation air to the boiler.

Should overheating occur or gas supply fail to shut off, do not turn off or disconnect electrical supply to circulator. Instead, shut off the gas supply at a location external to the appliance.

Do not use this boiler if any part has been under water. The possible damage to a flooded appliance can be extensive and present numerous safety hazards. Any appliance that has been under water must be replaced.

Boiler water –

Thoroughly flush the system to remove debris. Use an approved pre-commissioning cleaner (see Start-Up Section), without the boiler connected, to clean the system and remove sediment. The high-efficiency heat exchanger can be damaged by build-up or corrosion due to sediment.

NOTE: Cleaners are designed for either new systems or pre-existing systems. Choose accordingly.

Freeze protection fluids –

NEVER use automotive antifreeze. Use only inhibited propylene glycol solutions, which are specifically formulated for hydronic systems. Ethylene glycol is toxic and can attack gaskets and seals used in hydronic systems.

3

The Crest - How it works...

1.Front access panels

Provides access to the controls compartment.

2.Top access panel

Provides access to the burner compartment.

3.Air pressure switch

The air pressure switch detects blocked flue/vent conditions.

4.Blower

The blower pulls in air and gas through the venturi (item 34). Air and gas mix inside the blower and is pushed into the burner, where they burn inside the combustion chamber.

5.Boiler drain connection

Location from which the heat exchanger can be drained.

6.Boiler inlet temperature sensor

The boiler inlet temperature sensor monitors system return water temperature. If selected as the controlling sensor, the control module will adjust the boiler firing rate so the inlet temperature matches the set point.

7.Boiler outlet temperature sensor

The boiler outlet temperature sensor monitors boiler outlet water temperature. If selected as the controlling sensor, the control module will adjust the boiler firing rate so the outlet temperature matches the set point.

8.Burner (not shown)

Single chamber design with a stress free metal fiber outer mesh and durable stainless steel structure. Provides firing rates up to 15:1 turndown (Model 751), 20:1 turndown (Models 1001 - 1251 and 2501 - 3501), 25:1 turndown (Models 1501 - 2001), 12:1 turndown (Model 4001) and 10:1 turndown (Models 5001 - 6001).

9.Condensate drain connection

The condensate drain connection provides a connection point to install a condensate drain line using flexible hose provided.

10.Control module (on control panel assembly)

The control module responds to internal and external signals and controls the blower, gas valves, and pump(s), depending on the application, to meet the heating demand.

11.Electronic display

Digital controls with SMART TOUCH screen technology, full color display, and an 8" user interface screen.

12.Flame inspection window

Two large high temperature quartz observation windows provide views of the burner surface during firing.

13.Dual flame sensors (not shown)

Two flame sensors are provided to monitor the main burner and transition flame.

14.Flue temperature sensor

The flue sensor monitors flue gas temperature. The control module will modulate or shut the boiler down if the flue gas temperature gets too high.

15.Gas connection pipe

The gas connection pipe is a threaded black iron pipe connection (see Gas Connections Section for specific model pipe size requirements). This pipe should be connected to the incoming gas supply to deliver gas to the boiler.

16.Gas shutoff valve (inside unit)

The manual gas shutoff valve is used to isolate the boiler gas train from the gas supply.

17.Gas valves

The gas valves sense the negative pressure created by the blower, allowing gas to flow only if the gas valves are powered and combustion air is flowing.

18.Condensate trap

The condensate trap is sized for a 1" PVC outlet connection pipe.

19.High limit devices (primary and backup)

The high limit devices are used to monitor the outlet water temperature - if either device senses the water temperature exceeding the predetermined setting, the boiler will shut down.

Installation & Operation Manual

20.Ignition electrode

An electrical spark across the electrodes will ignite the burner.

21.Line voltage junction box

The line voltage junction box contains the connection points for the line voltage power to the boiler (and pumps if used).

22.Line voltage wiring connections (knockouts)

Conduit connection points for the high voltage junction box.

23.Low gas pressure switch

Monitors gas supply pressure to the boiler and shuts the boiler down in the event a low gas pressure condition occurs.

24.High gas pressure switch

Monitors gas supply pressure to the boiler and shuts the boiler down in the event a high gas pressure condition occurs.

25.Low voltage connection board(s)

Connection boards used to connect external low voltage devices.

26.Low voltage wiring connections (knockouts)

Conduit connection points for the low voltage connection boards.

27.Low water cutoff probe (LWCO) (not shown)

Ensures adequate water is supplied to the boiler. In the event of inadequate water levels, the boiler will shut down.

28.Power switch

The On/Off power switch provides the ability to turn line voltage power to the boiler on and off.

29.Relief valve

The safety relief valve protects the heat exchanger from an over pressure condition. The boiler comes with a 50 PSI relief valve as standard equipment. Optional settings are available.

30.Reset switch

Reset switch for the low water cutoff. Hold the switch for 10 seconds to reset.

31.Test switch

The test switch permits manual triggering of the LWCO safety circuit to test the contacts and evaluate the integrity of the circuit. Hold the switch for 10 seconds to test.

32.Firetube heat exchanger

High grade stainless steel WAVETM firetube design that extracts heat from flue gases and transfers it directly into boiler water.

33.Temperature and pressure gauge

Monitors the outlet temperature of the boiler as well as the system water pressure.

34.Venturi

The venturi controls air and gas flow into the burner.

35.Water inlet

An ANSI flange connects the return water from the system to the heat exchanger.

36.Water outlet

An ANSI flange connects the hot water supply from the boiler to the system.

37.Ignition transformer

The transformer provides voltage to the ignition electrode (item 20).

38.Air arm temperature sensor (not shown)

Monitors fuel-air delivery temperature to the burner.

39.Air inlet cover (shipped loose)

Used with room air for combustion and to prevent debris from entering the boiler.

40.Fuses

A low resistance resistor that acts as a sacrificial device to provide over current protection, of either the load or source circuit.

41.Air metering valve

The air metering valve is used to control the amount of air used when firing.

42.Air metering valve air pressure switch

The air metering valve air pressure switch is used to ensure the air metering valve is open when firing gas valve 2.

43.Proof of closure valve (not shown)

An additional safety shutoff valve with proof of closure contacts is used on the Crest 6.0 model only.

4

Lochinvar FBN0751, FBN1001, FBN1251, FBN1501, FBN1751 Installation Manual

Installation & Operation Manual

The Crest - How it works... (continued)

NOTICE

FBN1000 Series 100 model shown for illustration purposes only.

 

 

 

2

 

 

 

39

 

 

 

 

 

 

29

 

 

 

 

7

 

 

 

 

19

 

1

 

 

36

 

 

 

 

 

 

 

 

12

 

 

 

 

20

3

11

 

 

6

 

 

 

 

 

 

5

IMG01128

 

 

IMG01025

18

 

 

 

 

 

 

 

 

35

 

Front View

 

 

Rear View

 

 

21

25

 

37

 

22

26

 

 

 

 

15

 

 

 

 

4

34

 

 

 

41

 

 

 

 

33

 

 

 

 

 

 

24

 

 

 

 

23

 

 

 

 

 

 

16

10

 

 

 

17

40

 

19

 

42

 

 

 

 

 

 

 

 

 

30

 

 

 

 

31

 

 

14

 

28

 

9

 

 

 

 

IMG01130

32

 

IMG01129

 

 

 

 

 

 

Left Side (inside unit)

 

Right Side (inside unit)

5

Installation & Operation Manual

Ratings

Crest

AHRI Rating

 

 

 

 

 

Net

Model Number

Input

 

Gross

AHRI

 

MBH

 

Output

Ratings

Note: Change “N” to

 

 

 

MBH

Water,

(Notes 4 - 6)

 

MBH

“L” for L.P. gas models.

 

 

 

 

 

 

 

 

 

(Note 1)

(Note 2)

 

Min

 

Max

 

 

 

 

FB(N,L)0751

50

 

750

720

626

FB(N,L)1001

50

 

999

960

835

FB(N,L)1251

62

 

1250

1200

1043

FB(N,L)1501

60

 

1500

1440

1252

FB(N,L)1751

70

 

1750

1680

1460

FB(N,L)2001

80

 

1999

1920

1670

FB(N,L)2501

125

 

2500

2403

2089

FB(N,L)3001

150

 

3000

2880

2504

FB(N,L)3501

175

 

3500

3360

2922

FB(N,L)4001

333

 

3999

3840

3339

FB(N,L)5001

500

 

4999

4800

4174

FB(N,L)6001

600

 

6000

5760

5009

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Other Specifications

 

 

 

 

 

 

 

 

 

Appliance

 

 

 

 

Vent

Weight

Pipe

Pipe

Gas Inlet

Air

Size

w/Water

Water

Size

Size

Size

 

(lbs.)

Content

Size

 

 

Gallons

Outlet

Inlet

 

 

 

 

 

 

 

 

 

(Note 3)

 

 

 

 

 

 

 

 

73

3"

3"

1 1/4"

6"

6"

1768

 

 

 

 

 

 

 

77

3"

3"

1 1/4"

6"

6"

1838

87

3"

3"

1 1/2"

6"

8"

1975

94

4"

4"

1 1/2"

8"

8"

2307

106

4"

4"

1 1/2"

8"

8"

2458

111

4"

4"

1 1/2"

8"

8"

2570

157

4"

4"

2"

8"

9"

3600

156

4"

4"

2"

10"

10"

3900

202

4"

4"

2"

10"

10"

4600

201

4"

4"

2 1/2"

12"

12"

5200

254

6"

6"

2 1/2"

14"

14"

5900

304

6"

6"

2 1/2"

14"

14"

6900

NOTICE Maximum allowed working pressure is located on the rating plate.

Notes:

1.The ratings are based on standard test procedures prescribed by the United States Department of Energy.

2.Net AHRI ratings are based on net installed radiation of sufficient quantity for the requirements of the building and nothing need be added for normal piping and pickup. Ratings are based on a piping and pickup allowance of 1.15.

3.Crest boilers require special gas venting. Use only the vent materials and methods specified in the Crest Installation and Operation Manual.

4.Standard Crest boilers are equipped to operate from sea level to 4,500 feet only. The boiler will de-rate by 1.4% for each 1,000 feet above sea level up to 4,500 feet.

5.High altitude Crest Models are equipped to operate from

3,000 to 12,000 feet only. The boiler will not de-rate up to 5,500 feet and will de-rate by 1.6% for each 1,000 feet above 5,500 feet. The operation given in this manual remains the same as the standard boilers. A high altitude label (as shown in FIG A.) is also affixed to the unit.

De-rate values are based on proper combustion

calibration and CO2’s adjusted to the recommended levels.

6.High altitude Crest Models 4.0 and 5.0 will not de-rate up to 5,500 feet.

7.The high altitude Crest 6.0 model will de-rate by 2.0% for each 1000 feet above sea level up to 5,500 feet.

8.For Crest Models 4.0, 5.0 and 6.0, installations above 5,500 feet contact the factory.

9.Ratings have been confirmed by the Hydronics Section of AHRI.

UNIT EQUIPPED FOR

HIGH ALTITUDE

3,000 FT. TO 12,000 FT.

IMG01026

 

6

 

Figure A High Altitude Label Location

 

 

Installation & Operation Manual

1 Determine boiler location

Installation must comply with:

 

 

8.

Check around the boiler for any potential air contaminants

Local, state, provincial, and national

codes, laws,

 

that could risk corrosion to the boiler or the boiler combustion

 

regulations, and ordinances.

 

 

 

 

 

 

air supply

(see Table 1A on

page 9). Prevent combustion air

• National Fuel Gas Code, NFPA 54 / ANSI Z223.1 –

 

contamination. Remove any of these contaminants from the boiler

 

latest edition.

 

 

 

 

 

 

 

 

 

area.

 

 

 

Standard for Controls and Safety

 

Devices

for

 

 

DO NOT install units in rooms or environments that

 

Automatically Fired Boilers, ANSI/ASME CSD-1 -

WARNING

 

latest edition, when required.

 

 

 

 

 

 

contain corrosive contaminants (see Table 1A on page

 

 

 

 

 

 

 

9). Failure to comply could result in severe personal

• National Electrical Code, NFPA 70 - latest edition.

 

 

 

 

injury, death, or substantial property damage.

For Canada only:

CSA B149.1 Installation Code,

 

 

 

 

 

 

 

 

CSA C22.1 Canadian Electrical Code Part 1 and any

WARNING

This appliance is certified as an indoor appliance. Do

 

local codes.

 

 

 

 

 

 

 

 

 

 

not install the appliance outdoors or locate where the

 

NOTICE

The

Crest

gas manifold and

 

 

appliance will be exposed to freezing temperatures or

 

controls met safe lighting and other

 

 

to temperatures that exceed 100°F (37.8°C).

 

 

 

 

 

 

performance criteria when the boiler

 

 

Do not install the appliance where the relative humidity

 

 

underwent tests specified in ANSI

 

 

may exceed 93%.

Do not install the appliance where

 

 

Z21.13/CSA 4.9 – latest edition.

 

 

 

condensation may form on the inside or outside of

Before locating the boiler, check:

 

 

 

the appliance, or where condensation may fall onto

1. Check for nearby connection to:

 

 

 

 

 

 

the appliance.

 

 

 

 

 

 

 

 

Failure to install the appliance indoors could result in

 

• System water piping

 

 

 

 

 

 

 

 

 

• Venting connections

 

 

 

 

 

 

 

 

severe personal injury, death, or substantial property

 

• Gas supply piping

 

 

 

 

 

 

 

 

damage.

 

 

 

• Electrical power

 

 

 

 

 

 

 

WARNING

This appliance requires a special venting system.

2. Locate the appliance so that if water connections

 

 

Use only the vent materials specified in this manual.

 

should leak, water damage will not occur.

When

 

 

Failure to follow all instructions can result in flue gas

 

such locations cannot be avoided, it is

 

 

spillage and carbon monoxide emissions, causing

 

recommended that a suitable drain pan, adequately

 

 

severe personal injury or death.

 

 

drained, be installed under the appliance.

The

Provide clearances:

 

 

 

pan must not restrict combustion air flow. Under no

Clearances from combustible materials

 

 

circumstances is

the

manufacturer

to be

held

-

Hot water pipes

1/4"

 

 

responsible for water damage in connection with

 

 

-

Sides

 

0"

 

 

this appliance, or any of its components.

 

 

 

 

 

 

 

-

Rear...............................................................................

 

0"

 

3.

Check area

around the

boiler.

Remove

any

-

Front .............................................................................

 

0"

 

-

Top

 

0"

 

 

combustible

materials,

gasoline

 

and

other

 

 

 

 

-

Floor

 

Combustible

 

 

flammable liquids.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Vent pipe - Follow special vent system manufacturer’s instructions

WARNING

Failure to keep boiler area clear

Figure 1-1 Clearances

 

 

and free of combustible materials,

 

 

 

 

gasoline,

and other

flammable

1" (25 MM) MINIMUM CLEARANCE

VENT PIPE:

 

 

 

liquids and

vapors

can result in

AROUND HOT WATER PIPES

 

 

 

FOLLOW SPECIAL VENT SYSTEM

 

 

 

 

 

 

 

severe personal injury, death, or

 

 

 

MANUFACTURER'S INSTRUCTIONS

 

 

 

 

 

 

 

 

 

substantial property damage.

 

 

 

 

 

 

4.

The Crest must be installed so that

gas

control

 

 

 

 

0"

 

 

 

 

TOP

 

system components are protected from dripping or

 

 

 

 

 

 

spraying water or rain during operation or service.

 

 

 

 

VENTILATING*

 

 

 

 

 

AIR OPENING

5. If a new boiler will replace an existing boiler, check

 

 

 

 

 

 

for and correct system problems, such as:

 

 

 

 

 

 

 

 

• System leaks causing oxygen corrosion or heat

 

 

 

 

CLOSED DOOR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

exchanger cracks from hard water deposits.

 

 

 

 

 

 

 

• Incorrectly-sized expansion tank.

 

 

 

 

 

 

 

 

VENTILATING*

 

• Lack of freeze protection in boiler water causing

 

 

 

 

 

 

0"

 

 

 

system and boiler to freeze and leak.

 

 

 

 

LEFT

 

 

 

 

 

 

 

 

0"

 

 

 

• Debris left from existing piping, if not flushed and

 

 

REAR

 

 

 

 

 

 

 

 

 

cleaned with an appropriate cleaner.

 

 

 

 

 

 

 

0"

6. The appliance must be installed on a level floor,

 

 

 

 

RIGHT

 

FLOOR: COMBUSTIBLE

 

 

 

both front to back and side to side, for proper

 

 

 

 

 

 

 

 

 

 

condensate drainage.

 

 

 

 

 

 

 

 

 

0"

IMG01027

 

 

 

 

 

 

 

 

 

 

FRONT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7. If the optional neutralizing kit is to be used, elevate

 

7

 

 

 

the boiler at least 3" above the floor.

 

 

 

 

 

Installation & Operation Manual

1 Determine boiler location

NOTICE

If you do not provide the recommended

service clearances shown, it may not be

 

 

possible to service the boiler without

 

removing it from the space.

Recommended clearances for service access

-

Sides ..............................................................................

24"

-

Rear...............................................................................

24"

-

Front .............................................................................

30"

-

Top................................................................................

24"

Maintain minimum specified clearances for adequate operation. All installations must allow sufficient space for servicing the vent connections, water pipe connections, piping and other auxiliary equipment, as well as the appliance. The clearance labels on each appliance note the same service and combustible clearance requirements as shown in this manual.

Multiple boilers may be installed side by side with no clearance between adjacent boilers because this boiler is approved for zero clearance from combustible surfaces; however, service access will be limited from the sides.

Consult the Venting section of this manual for specific installation instructions for the appropriate type of venting system that you will be using.

Provide air openings to room:

The Crest alone in boiler room

1.No air ventilation openings into the boiler room are needed when clearances around the Crest are at least equal to the SERVICE clearances shown in FIG. 1-1. For spaces that do NOT supply this clearance, provide two openings as shown in FIG. 1-1. Each opening must provide one square inch free area per 1,000 Btu/hr of boiler input.

2.Combustion air openings are required when using the Room Air Option on page 28 of this manual.

The Crest in same space with other gas or oil-fired appliances

1.Follow the National Fuel Gas Code (U.S.) or CSA B149.1 (Canada) to size/verify size of the combustion/ventilation air openings into the space.

WARNING The space must be provided with combustion/ventilation air openings

correctly sized for all other appliances located in the same space as the Crest.

Failure to comply with the above warnings could result in severe personal injury, death, or substantial property damage.

2.Size openings only on the basis of the other appliances in the space. No additional air opening free area is needed for the Crest when it takes its combustion air from outside (direct vent installation).

8

Flooring and foundation

Flooring

The Crest is approved for installation on combustible flooring, but must never be installed on carpeting.

WARNING

Do not install the boiler on carpeting even if

foundation is used. Fire can result, causing

 

 

severe personal injury, death, or substantial

 

property damage.

If flooding is possible, elevate the boiler sufficiently to prevent water from reaching the boiler.

WARNING Assure that the floor and structure is sufficient to support the installed weight

of the boiler, including the water content in the heat exchanger. If not, structural building failure will result, causing severe personal injury, death, or substantial property damage.

Vent and air piping

The Crest requires a special gas vent system, designed for pressurized venting.

The boiler is to be used for either direct vent installation or for installation using indoor combustion air. When room air is considered, see page 28 of this manual. Note prevention of combustion air contamination below when considering vent/ air termination.

Vent and air must terminate near one another and may be vented vertically through the roof or out a side wall, unless otherwise specified. You may use any of the vent/air piping methods covered in this manual. Do not attempt to install the Crest using any other means.

Be sure to locate the boiler such that the vent and air piping can be routed through the building and properly terminated. The vent/air piping lengths, routing and termination method must all comply with the methods and limits given in this manual.

Prevent combustion air contamination

Install air inlet piping for the Crest as described in this manual. Do not terminate vent/air in locations that can allow contamination of combustion air. Refer to Table 1A, page 9 for products and areas which may cause contaminated combustion air.

WARNING Ensure that the combustion air will not contain any of the contaminants in Table

1A, page 9. Contaminated combustion air will damage the boiler, resulting in possible severe personal injury, death or substantial property damage. Do not pipe combustion air near a swimming pool, for example. Also, avoid areas subject to exhaust fumes from laundry facilities. These areas will always contain contaminants.

Installation & Operation Manual

1 Determine boiler location (continued)

When using an existing vent system to install a new boiler:

WARNING Failure to follow all instructions can result in flue gas spillage and carbon monoxide

emissions, causing severe personal injury or death.

Check the following venting components before installing:

Material - For materials listed for use with this appliance, see Section 2 - General Venting, Table 2A-1. For stainless steel venting, an adapter of the same manufacturer (Table 2B) may be used at the flue collar connection.

Size - To ensure proper pipe size is in place, see Table 2C. Check to see that this size is used throughout the vent system.

Manufacturer - Only use the listed manufacturers and their type product listed in Table 2A-1 for CAT IV positive pressure venting with flue producing condensate.

Supports - Non-combustible supports must be in place allowing a minimum 1/4" rise per foot. The supports should adequately prevent sagging and vertical slippage, by distributing the vent system weight. For additional information, consult the vent manufacturer’s instructions for installation.

Terminations - Carefully review Sections 2 through 4 to ensure requirements for the location of the vent and air terminations are met and orientation of these fit the appropriate image from the Sidewall or Vertical options listed in the General Venting Section.

Seal - With prior requirements met, the system should be tested to the procedure listed in parts (c) through (f) of the Removal of an Existing Boiler Section on page 10.

With stainless steel vent, seal and connect all pipe and components as specified by the vent manufacturer used.

If any of these conditions are not met,WARNING the existing system must be updated or

replaced for that concern. Failure to follow all instructions can result in flue gas spillage and carbon monoxide emissions, causing severe personal injury or death.

Table 1A Corrosive Contaminants and Sources

Products to avoid:

Spray cans containing chloro/fluorocarbons

Permanent wave solutions

Chlorinated waxes/cleaners

Chlorine-based swimming pool chemicals

Calcium chloride used for thawing

Sodium chloride used for water softening

Refrigerant leaks

Paint or varnish removers

Hydrochloric acid/muriatic acid

Cements and glues

Antistatic fabric softeners used in clothes dryers

Chlorine-type bleaches, detergents, and cleaning solvents found in household laundry rooms

Adhesives used to fasten building products and other similar products

Areas likely to have contaminants

Dry cleaning/laundry areas and establishments

Swimming pools

Metal fabrication plants

Beauty shops

Refrigeration repair shops

Photo processing plants

Auto body shops

Plastic manufacturing plants

Furniture refinishing areas and establishments

New building construction

Remodeling areas

Garages with workshops

9

Installation & Operation Manual

1 Determine boiler location

When removing a boiler from existing common vent system:

DANGER

Do not install the Crest into a common

 

 

vent with any other appliance except

 

 

 

 

as noted in Section 2 on page 20.

 

 

This will cause flue gas spillage or

 

 

appliance malfunction, resulting in

 

 

possible severe personal injury, death,

 

 

or substantial property damage.

 

 

Failure to follow all instructions can

WARNING

 

 

result in flue gas spillage and carbon

 

 

monoxide emissions, causing severe

 

 

personal injury or death.

At the time of removal of an existing boiler, the following steps shall be followed with each appliance remaining connected to the common venting system placed in operation, while the other appliances remaining connected to the common venting system are not in operation.

a.Seal any unused openings in the common venting system.

b.Visually inspect the venting system for proper size and horizontal pitch and determine there is no blockage or restriction, leakage, corrosion, or other deficiencies, which could cause an unsafe condition.

c.Test vent system – Insofar as is practical, close all building doors and windows and all doors between the space in which the appliances remaining connected to the common venting system are located and other spaces of the building. Turn on clothes dryers and any appliance not connected to the common venting system. Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they will operate at maximum speed. Do not operate a summer exhaust fan. Close fireplace dampers.

d.Place in operation the appliance being inspected. Follow the lighting instructions. Adjust thermostat so appliance will operate continuously.

e.Test for spillage at the draft hood relief opening after 5 minutes of main burner operation. Use the flame of a match or candle, or smoke from a cigarette, cigar, or pipe.

f.After it has been determined that each appliance remaining connected to the common venting system properly vents when tested as outlined herein, return doors, windows, exhaust fans, fireplace dampers, and any other gas-burning appliance to their previous conditions of use.

g.Any improper operation of the common venting system should be corrected so the installation conforms with the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or CAN/CSA B149.1, Natural Gas and Propane Installation Code. When re-sizing any portion of the common venting system, the common venting system should be resized to approach the minimum size as determined using the appropriate tables in Part 11 of the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or CAN/CSA B149.1, Natural Gas and Propane Installation Code.

Remove boiler from wood pallet

1.After removing the outer shipping crate and plastic from the boiler, remove the parts package (packaged parts inside the controls compartment of the boiler inside the lower front access panel).

2.To remove the boiler from the pallet:

a.Remove the three (3) shipping bolts located inside the controls compartment securing the boiler to the front of the pallet (see FIG. 1-2).

b.Remove the three (3) shipping bolts that fasten the tie-down brackets securing the legs to the rear of the pallet (FIG. 1-2).

c.The boiler can now be removed from the pallet using a lift truck lifting from the front or rear of the boiler. If lifting from the front, the lift truck forks must extend at least half way under the boiler heat exchanger to assure proper lifting technique with no damage to the boiler.

WARNING Failure to assure the truck forks are long enough to extend at least halfway

under the boiler heat exchanger will result in the boiler tipping off the lift truck, and potentially falling. This will result in severe personal injury, death, or substantial property damage.

d.If lifting by crane is desired, remove the top access panels to gain access to the lifting lugs located on the boiler (see FIG. 1-3). It is also recommended that the upper and lower front panels along with both front side panels be removed (no tools required).

Do not drop the boiler or bump the jacket NOTICE on the floor or pallet. Damage to the

boiler can result.

10

Installation & Operation Manual

1 Determine boiler location

Figure 1-2 Boiler Mounted on Shipping Pallet

(continued)

Combustion and ventilation air requirements for appliances drawing air from the equipment room

BOLT, WASHERS & LOCKNUT (3X)

FRONT

 

LAG BOLTS & TABS

REAR

 

 

 

(3X)

Figure 1-3 Boiler Removed from Shipping Pallet

REMOVE MIDDLE

TOP COVER

LIFTING

LUGS

LIFTING

LUGS

IMG01028

Provisions for combustion and ventilation air must be in accordance with Air for Combustion and Ventilation, of the latest edition of the National Fuel Gas Code, NFPA 54 / ANSI

Z223.1, in Canada, the latest edition of CGA Standard B149

Installation Code for Gas Burning Appliances and Equipment, or applicable provisions of the local building codes.

The equipment room MUST be provided with properly sized openings and/or be of sufficient volume to assure adequate combustion air and proper ventilation for all gas fired appliances in the equipment room to assure adequate combustion air and proper ventilation.

The requirements shown are for the appliance only; additional gas fired appliances in the equipment room will require an increase in the net free area and/or volume to supply adequate combustion air for all appliances.

No combustion air openings are needed when the appliance is installed in a space with a volume NO LESS than 50 cubic feet per 1,000 Btu/hr of all installed gas fired appliances and the building MUST NOT be of “Tight Construction”3.

A combination of indoor and outdoor combustion air may be utilized by applying a ratio of available volume to required volume times the required outdoor air opening(s) size(s). This must be done in accordance with the National Fuel Gas Code, NFPA 54 / ANSI Z223.1.

 

 

 

 

 

IMG01029

Figure 1-4_Combustion Air Direct from Outside

1. If air

is

taken

directly

from outside

the building

with

no

duct,

provide

two permanent

openings to

the equipment room each with a net free area of one square inch per 4000 Btu/hr input (5.5 cm2 per kW) (see FIG. 1-4).

11

Installation & Operation Manual

1 Determine boiler location

IMG01030

Figure 1-5_Combustion Air Through Ducts

2.If combustion and ventilation air is taken from the outdoors using a duct to deliver the air to the equipment room, each of the two openings should be sized based on a minimum free area of one square inch per 2000 Btu/hr (11 cm2 per kW) of input (see FIG. 1-5).

IMG01031

Figure 1-6_Combustion Air from Interior Space

3.If air is taken from another interior space combined with the equipment room:

(a)Two spaces on same story: Each of the two openings specified above should have a net free area of one square inch for each 1000 Btu/hr (22 cm2 per kW) of input, but not less than 100 square inches (645 cm2) (see FIG. 1-6).

(b)Two spaces on different stories: One or more openings should have a net free area of two square inches per 1000 Btu/hr (44 cm2 per kW).

IMG01032

Figure 1-7_Combustion Air from Outside - Single Opening

4.If a single combustion air opening is provided to bring combustion air in directly from the outdoors, the opening must be sized based on a minimum free area of one square inch per 3000 Btu/hr (7 cm2 per kW). This opening must be located within 12” (30 cm) of the top of the enclosure (see FIG. 1-7).

Combustion air requirements are based on the latest edition of the National Fuel Gas Code, NFPA 54 / ANSI Z223.1; in Canada refer to the latest edition of CGA Standard CAN/CSA B149.1. Check all local code requirements for combustion air. All dimensions based on net free area in square inches. Metal louvers or screens reduce the free area of a combustion air opening a minimum of approximately 25%. Check with louver manufacturers for exact net free area of louvers.

Where two openings are provided, one must be within 12"

(30 cm) of the ceiling and one must be within 12" (30 cm) of the floor of the equipment room. Each opening must have a net free area as specified in Table 1B. Single openings shall commence within 12" (30 cm) of the ceiling. The minimum dimension of air openings shall not be less than 3" (80 mm).

Under no circumstances should theCAUTION equipment room ever be under negative

pressure. Particular care should be taken where exhaust fans, attic fans, clothes dryers, compressors, air handling units, etc., may take away air from the unit.

The combustion air supply must be completely free of any flammable vapors that may ignite or chemical fumes which may be corrosive to the appliance. Common corrosive chemical fumes which must be avoided are fluorocarbons and other halogenated compounds, most commonly present as refrigerants or solvents, such as Freon, trichlorethylene, perchlorethylene, chlorine, etc. These chemicals, when burned, form acids which quickly attack the stainless steel heat exchanger, headers, flue collectors, and the vent system.

The result is improper combustion and a non-warrantable, premature appliance failure.

EXHAUST FANS: Any fan or equipment which exhausts air from the equipment room may deplete the combustion air supply and/or cause a downdraft in the venting system. Spillage of flue products from the venting system into an occupied living space can cause a very hazardous condition that must be corrected immediately.

12

Installation & Operation Manual

1 Determine boiler location (continued)

TABLE - 1B

MINIMUM RECOMMENDED COMBUSTION

AIR SUPPLY TO EQUIPMENT ROOM

 

FIG. 1-4

 

FIG. 1-5

 

 

 

 

FIG. 1-6

 

 

FIG. 1-7

 

*Outside Air from

 

*Outside Air from

 

 

Inside Air from

 

 

 

 

 

2 Ducts Delivered from Interior Space2

*Outside Air from

Model

2 Openings Directly from

2 Ducts Delivered from

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1 Opening Directly

Number

Outdoors1

 

Outdoors1

 

 

Same Story

 

 

Different

 

 

 

 

 

 

 

 

 

Stories

from Outdoors, in2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(cm2)1

 

Top

Bottom

Top

Bottom

Top

 

Bottom

 

Total

 

Opening, in2

Opening, in2

Opening, in2

Opening, in2

Opening, in2

 

Opening, in2

 

Openings, in2

 

 

 

(cm2)

(cm2)

(cm2)

(cm2)

(cm2)

 

(cm2)

 

(cm2)

 

 

FB 0751

188 (1213)

188 (1213)

375

(2420)

375

(2420)

750

(4839)

 

750

(4839)

 

1500 (9678)

250

(1613)

FB 1001

250 (1613)

250 (1613)

500

(3226)

500

(3226)

1000 (6452)

 

1000 (6452)

 

2000 (12904)

333

(2149)

FB 1251

313 (2020)

313 (2020)

625

(4033)

625

(4033)

1250 (8065)

 

1250 (8065)

 

2500 (16129)

417

(2691)

FB 1501

375 (2420)

375 (2420)

750

(4839)

750

(4839)

1500 (9678)

 

1500 (9678)

 

3000 (19355)

500

(3226)

FB 1751

438 (2826)

438 (2826)

875

(5646)

875

(5646)

1750

(11291)

 

1750

(11291)

 

3500 (22581)

583

(3762)

FB 2001

500 (3226)

500 (3226)

1000 (6452)

1000 (6452)

2000

(12904)

 

2000

(12904)

 

4000 (25807)

667

(4304)

FB 2501

625 (4033)

625 (4033)

1250 (8065)

1250 (8065)

2500

(16129)

 

2500

(16129)

 

5000 (32258)

833

(5381)

FB 3001

750 (4839)

750 (4839)

1500 (9678)

1500 (9678)

3000

(19355)

 

3000

(19355)

 

6000 (38710)

1000 (6452)

FB 3501

875 (5646)

875 (5646)

1750

(11291)

1750

(11291)

3500

(22581)

 

3500

(22581)

 

7000 (45162)

1167 (7530)

FB 4001

1000 (6450)

1000 (6450)

2000

(12900)

2000

(12900)

4000

(25800)

 

4000

(25800)

 

8000 (51600)

1333 (8600)

FB 5001

1250 (8062)

1250 (8062)

2500

(16129)

2500

(16129)

5000

(32250)

 

5000

(32250)

10000 (64500)

1667

(10750)

FB 6001

1500 (9677)

1500 (9677)

3000

(19355)

3000

(19355)

6000

(38710)

 

6000

(38710)

12000 (77419)

2000

(12903)

The above requirements are for the appliance only; additional gas fired appliances in the equipment room will require an increase in the net free area and/or volume to supply adequate combustion air for all appliances.

No combustion air openings are needed when the appliance is installed in a space with a volume NO LESS than 50 cubic feet per 1,000 Btu/hr of all installed gas fired appliances. Buildings MUST NOT be of *“Tight Construction”3.

1Outside air openings shall directly communicate with the outdoors.

2Combined interior space must be 50 cubic feet per 1,000 Btu/hr input. Buildings MUST NOT be of *“Tight Construction”. 3”Tight Construction” is defined as a building with less than 0.40 ACH (air changes per hour). For buildings of “Tight Construction”, provide air openings into the building from outside.

Combustion air filter

This unit has a standard air filter located at the combustion air inlet. This air filter is provided to help ensure clean air is used for the combustion process. Check this filter every month and replace when it becomes dirty. You can find these commercially available filters at any home center or HVAC supply store. Follow the steps below when replacing the combustion air filter:

1.Locate the combustion air filter box.

2.Lift and remove the air filter box cover to gain access to the air filter.

3.Slide the air filter out the top of the air filter box.

4.Inspect the air filter for dirt and debris, replace if necessary.

5.Replace the air filter and the air filter box cover.

NOTICE

CAUTION

During construction the air filter should be checked more frequently to ensure it does not become clogged with combustion dirt and debris.

Sustained operation of an appliance with a clogged burner may result in nuisance operational problems, bad combustion, and non-warrantable component failures.

13

Installation & Operation Manual

2 General venting

Direct venting

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IMG01033

 

 

 

IMG01057

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IMG01056

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Sidewall

Vertical Vent, Sidewall Air

Vertical

Optional room air

IMG01059

IMG01058

Sidewall

Vertical

14

Installation & Operation Manual

2 General venting (continued)

Install vent and combustion air piping

DANGER The Crest must be vented and supplied with combustion and ventilation air as

described in this section. Ensure the vent and air piping and the combustion air supply comply with these instructions regarding vent system, air system, and combustion air quality. See also Section 1 of this manual.

Inspect finished vent and air piping thoroughly to ensure all are airtight and comply with the instructions provided and with all requirements of applicable codes.

Failure to provide a properly installed vent and air system will cause severe personal injury or death.

Air inlet pipe materials:

The air inlet pipe(s) must be sealed. Choose acceptable combustion air inlet pipe materials from the following list:

ABS, PVC, or CPVC

Dryer Vent or Sealed Flexible Duct (not recommended for rooftop air inlet)

Galvanized steel vent pipe with joints and seams sealed as specified in this section.

Type “B” double-wall vent with joints and seams sealed as specified in this section.

AL29-4C, stainless steel material to be sealed to specification of its manufacturer.

*Plastic pipe may require an adapter (not provided) to transition between the air inlet connection on the appliance and the plastic air inlet pipe.

Sealing of Type “B” double-wall vent material or galvanized vent pipe material used for air inlet piping on a sidewall or vertical rooftop Combustion Air Supply System:

a.Seal all joints and seams of the air inlet pipe using either Aluminum Foil Duct Tape meeting UL Standard 723 or 181A-P or a high quality UL Listed silicone sealant such as those manufactured by Dow Corning or General Electric.

b.Do not install seams of vent pipe on the bottom of horizontal runs.

c.Secure all joints with a minimum of three sheet metal screws or pop rivets. Apply Aluminum Foil Duct Tape or silicone sealant to all screws or rivets installed in the vent pipe.

d.Ensure that the air inlet pipes are properly supported.

The PVC, CPVC, or ABS air inlet pipe should be cleaned and sealed with the pipe manufacturer’s recommended solvents and standard commercial pipe cement for the material used. The ABS, PVC, CPVC, Dryer Vent or Flex Duct air inlet pipe should use a silicone sealant to ensure a proper seal at the appliance connection and the air inlet cap connection. Dryer vent or flex duct should use a screw type clamp to seal the vent to the appliance air inlet and the air inlet cap. Proper sealing of the air inlet pipe ensures that combustion air will be free of contaminants and supplied in proper volume.

WARNING Using vent or air intake materials other than those specified, failure to properly

seal all seams and joints or failure to follow vent pipe manufacturer’s instructions can result in personal injury, death or property damage. Mixing of venting materials will void the warranty and certification of the appliance.

The use of double-wall vent or insulated NOTICE material for the combustion air inlet

pipe is recommended in cold climates to prevent the condensation of airborne moisture in the incoming combustion air.

15

Installation & Operation Manual

2 General venting

When a sidewall or vertical rooftop combustion air supply system is disconnected for any reason, the air inlet pipe must be resealed to ensure that combustion air will be free of contaminants and supplied in proper volume.

DANGER

Failure to properly seal all joints and seams

 

as required in the air inlet piping may

 

result in flue gas recirculation, spillage

 

of flue products and carbon monoxide

 

emissions causing severe personal injury

 

or death.

Vent and air piping

The Crest is certified as a Category II/IV boiler. This product has been approved for use with stainless steel vent systems.

All venting systems used with a Crest boiler must be suitable for Category IV operation except for factory approved common vent systems operating as allowed in the Common Venting Section on page 20.

WARNING

NOTICE

Use only the materials, vent systems, and terminations listed in Table 2A-1. DO NOT mix vent systems of different types or manufacturers, unless listed in this manual. Failure to comply could result in severe personal injury, death, or substantial property damage.

Installations must comply with applicable national, state, and local codes. Stainless steel vent systems must be listed as a UL-1738 approved system for the United States and a ULC-S636 approved system for Canada.

NOTICE

Installation of a stainless steel vent system

should adhere to the stainless steel vent

 

 

manufacturer’s installation instructions

 

supplied with the vent system.

NOTICE

The Crest is supplied with an integral

FasNSeal vent connector (FIG. 2-1). The

 

 

installer must use a specific vent starter

 

adapter supplied by the vent manufacturer

 

to adapt to different vent systems.

Air intake/vent connections

1.Combustion Air Intake Connector (FIG. 2-1) - Used to provide combustion air directly to the unit from outdoors. A fitting is provided with the unit for final connection. Combustion air piping must be supported per guidelines listed in the National Mechanical Code, Section 305, Table 305.4 or as local codes dictate.

2.Vent Connector (FIG. 2-1) - Used to provide a passageway for conveying combustion gases to the outside. A transition fitting is provided on the unit for final connection. Vent piping must be supported per the National Building Code, Section 305, Table 305.4 or as local codes dictate.

Figure 2-1 Combustion Air Adapter

AIR PIPE (FIELD SUPPLIED)

ROOM AIR BOX

SHIPPED WITH

UNIT

VENT PIPE (FIELD SUPPLIED)

IMG01034

CONNECTOR SIZED FOR STAINLESS STEEL

FLUE PIPE

The Crest uses model specific combustion air intake and vent piping sizes as detailed in Tables 2B and 2C on page 18.

NOTICE

Increasing or decreasing combustion air

or vent piping to sizes not specified in this

 

 

manual is not authorized.

Table 2A-1 Approved Stainless Steel Vent Manufacturers

Approved Stainless Steel Vent Manufacturers

Make

Model

ProTech Systems (Dura-Vent Co.)

FasNSeal Vent

Z-Flex (Nova Flex Group)

Z-Vent

Heat Fab (Selkirk Corporation)

Saf-T Vent

Metal Fab

Corr/Guard

Securities Chimneys International

Secure Seal SS

Schebler Chimney Systems

eVent

ICC

VIC

Jeremias

--

16

Installation & Operation Manual

2 General venting (continued)

Table 2A-2 Approved Stainless Steel Terminations and Adapters - Category IV

Model

 

 

ProTech

 

 

Z Flex

 

Heat Fab

 

Adapter

 

Intake

Adapter

 

Intake

Adapter

Flue

 

 

Intake

 

 

 

 

 

 

751-1001

 

Not Required

 

810003269

2SVDSA06

2SVEE0690

9601MAD

CCK06TM

 

 

9690 / 9692

1251

 

*See note

 

810003281

2SVDSA06

2SVEE0690

9801MAD

CCK08TM

 

 

9690 / 9692

1501-2001

 

*See note

 

810003357 / 810003369

2SVDSA08

2SVEE0890

9801MAD

CCK08TM

 

 

9890 / 9892

Model

 

 

Metal-Fab

 

Security Chimney

 

ICC

 

Adapter

 

Flue

Intake

Adapter

Flue

 

Intake

Adapter

Flue

 

 

Intake

 

 

 

 

 

 

751-1001

 

 

 

MC

 

 

SS0MCU

 

SS6ST90AU

 

HE-6MC-F

 

 

HE-6E90-F

 

6FCGPVCA

 

6FCGSW90L

SS6PVCU

 

SSD0STAUK

HE-6DSA-F

 

 

 

 

6-36"

 

4" - 24"

 

HE-6RC-F

 

 

HE-6SCR-F

 

 

 

 

 

 

 

 

4" - 24"

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1251

 

8FCGLCA

 

MC

 

 

SS0MCU

 

SS6ST90AU

 

HE-8SCR-F

 

 

HE-6E90-F

 

 

6FCGSW90L

SS8CRESTU

 

SSD0STAUK

HE-8DSA-F

 

 

 

 

6-36"

 

4" - 24"

 

HE-8MC-F

 

 

HE-6SCR-F

 

 

 

 

 

 

 

 

4" - 24"

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1501-2001

 

 

 

MC

 

 

SS0MCU

 

SSE8E9OU

 

HE-8SCR-F

 

 

HE-8E90-F

 

8FCGLCA

 

8FCGSW90

SS8CRESTU

 

SD0STAUK

HE-8DSA-F

 

 

 

 

6-36"

 

4" - 24"

 

HE-8MC-F

 

 

HE-8SCR-F

 

 

 

 

 

 

 

 

4" - 24"

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Model

 

 

Jeremias

 

*No adapter needed when using 8" FasNSeal vent length.

 

Adapter

 

Flue

Intake

 

 

 

 

*Models 1251 - 1501: For installations using 6" vent, install a FasNSeal

 

 

 

 

 

 

 

751-1001

 

SWKL6-KLC

 

SWKL6-WRC

SWKL6-90ET

reducing adapter, available from the factory with kit #100295900. Reference

 

 

 

 

 

 

 

the manufacturer's part number provided for Models 751 - 1001 when

1251

 

SWKL8-KLC

 

SWKL8-WRC

SWKL6-90ET

 

 

 

 

 

 

 

adapting to different vent systems.

 

 

 

 

 

1501-2001

 

SWKL8-KLC

 

SWKL8-WRC

SWKL8-90ET

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Model

 

 

 

ProTech

 

 

Z Flex

 

Heat Fab

 

 

Adapter

 

Intake

Adapter

 

Intake

Adapter

Flue

 

Intake

 

 

 

 

 

2501

 

*See note

 

810003397 / 810003409

2SVDSA09

2SVEE990

9901MAD

CCK09TM

 

9890 / 9992

3001 - 3501

 

*See note

 

810003435 / 810003447

2SVDSA10

2SVEE1090

91001MAD

CCK10TM

 

91090 / 91092

4001

 

*See note

 

810003476 / 810003488

2SVDSA12

2SVEE1290

91201MAD

CCK12TM

 

91290 / 91292

5001 - 6001

 

*See note

 

810003516 / 810003528

2SVDSA14

2SVEE1490

91401MAD

CCK14TM

 

91490 / 91492

Model

 

 

 

Metal-Fab

 

Security Chimney

 

ICC

 

 

Adapter

 

Flue

 

Intake

Adapter

Flue

 

Intake

Adapter

Flue

 

Intake

 

 

 

 

 

 

2501

 

 

 

MC

 

 

 

SS0MCU

 

SSE9E9OU

 

HE-9SCR-F

 

HE-8E90-F

 

8FCGLCA

 

 

8FCGSW90

SS9CRESTU

 

SDOST90AUK

HE-9DSA-F

 

 

 

6-36"

 

4" - 24"

 

HE-9MC-F

 

HE-9SCR-F

 

 

 

 

 

 

 

 

4" - 10"

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3001 - 3501

 

 

 

MC

 

 

 

SS0MCU

 

SSE10E9OU

 

HE-10SCR-F

HE-10E90-F

 

10FCGLCA

 

 

10FCGSW90

SS10CRESTU

 

SDOST90AUK

HE-10DSA-F

 

 

6-36"

 

4" - 24"

 

HE-10MC-F

 

HE-10SCR-F

 

 

 

 

 

 

 

 

4" - 10"

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4001

 

12FCGLCA

 

MC

 

12FCGSW90

SS12CRESTU

SS0MCU

 

SSE12E9OU

HE-12DSA-F

HE-12SCR-F

HE-12E90-F

 

 

6-36"

 

4" - 24"

 

HE-12MC-F

HE-12SCR-F

 

 

 

 

 

 

 

 

 

 

5001 - 6001

 

14FCGLCA

 

MC

 

14FCGSW90

SS14CRESTU

SS0MCU

 

SSE14E9OU

HE-14DSA-F

HE-14SCR-F

HE-14E90-F

 

 

6-36"

 

4" - 24"

 

HE-14MC-F

 

HE-14SCR-F

 

 

 

 

 

 

 

 

 

 

 

Model

 

 

Jeremias

 

*No adapter needed when using Standard FNS Vent Length.

 

 

 

 

 

 

 

 

 

Adapter

 

Flue

 

Intake

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2501

 

SWKL9-KLC

 

SWKL9-WRC

SWKL9-90ET

 

 

 

 

 

 

 

 

 

3001 - 3501

 

SWKL10-KLC

 

SWKL10-WRC

SWKL10-90ET

 

 

 

 

 

 

 

 

 

4001

 

SWKL12-KLC

 

SWKL12-WRC

SWKL12-90ET

 

 

 

 

 

 

 

 

 

5001 - 6001

 

SWKL14-KLC

 

SWKL14-WRC

SWKL14-90ET

 

 

 

 

 

 

 

 

 

17

Installation & Operation Manual

2 General venting

Table 2B Direct Vent Minimum / Maximum Allowable Air / Vent Lengths

 

 

AIR INLET

 

 

VENT

 

Input

Model

Air Intake

Air Intake

Air Intake

Vent

Vent

Vent

De-Rate per

 

Diameter

Min. Length

Max. Length

Diameter

Min. Length

Max. Length

25 feet of Vent

0751-1001

6"

12'

100'

6"

18'

100'

0%

1251*

6"

12'

75'

6"

18'

75'

1%

1251

6"

12'

100'

8"

18'

100'

0%

1501*

8"

12'

75'

6"

18'

75'

1%

1501

8"

12'

100'

8"

18'

100'

0%

1751-2001

8"

12'

100'

8"

18'

100'

0%

2501

8"

12'

100'

9"

18'

100'

0%

3001

10"

12'

100'

10"

18'

100'

0%

3501

10"

12'

100'

10"

18'

100'

0%

 

 

 

 

 

 

 

 

4001

12"

12'

100'

12"

18'

100'

0%

5001/6001

14"

12'

100'

14"

18'

100'

0%

*FB 1251 - 1501 models using 6" vent require the installation of a field supplied reducing adapter (see Table 2A-2 on page 17). *FB 1251 - 1501 LP models using 6" diameter vent will de-rate 2.5% per 25 feet of vent.

Table 2C Room Air Minimum / Maximum Allowable Air / Vent Lengths

Model

Vent

Vent

Vent

Input De-Rate per

Diameter

Min. Length

Max. Length

25 feet of Vent

 

0751-1001

6"

18'

100'

0%

1251-1501*

6"

18'

100'

0%

1251-1501

8"

18'

100'

0%

1751-2001

8"

18'

100'

0%

2501

9"

18'

150'

0%

3001

10"

18'

150'

0%

3501

10"

18'

150'

0%

4001

12"

18'

150'

0%

5001/6001

14"

18'

150'

0%

*FB 1251 - 1501 models using 6" vent require the installation of a field supplied reducing adapter (see Table 2A-2 on page 17). *FB 1251 - 1501 LP models using 6" diameter vent will de-rate 2.5% per 25 feet of vent.

18

Installation & Operation Manual

2 General venting (continued)

When determining equivalent combustion air and vent length, add 5 feet (1.5m) for each 90° elbow and 3 feet (.9 m) for each 45° elbow.

EXAMPLE: 20 feet (6 m) of pipe + (4) 90° elbows + (3) 45° elbows = 49 equivalent feet (15 m) of piping.

Removing from existing vent

Follow the instructions in Section 1, page 10 of this manual when removing a boiler from an existing vent system.

Vent and air piping

Vent and air system:

Installation must comply with local NOTICE requirements and with the National Fuel

Gas Code, NFPA 54 / ANSI Z223.1 for U.S. installations or CSA B149.1 for Canadian installations.

You must also install air piping from outside to the boiler air intake adapter. The resultant installation is direct vent (sealed combustion).

You may use any of the vent/air piping methods covered in this manual. Do not attempt to install the Crest using any other means.

WARNING DO NOT mix components from different systems. The vent system could fail,

causing leakage of flue products into the living space. Use only approved stainless steel pipe and fittings.

When installing outdoor models OF(N,L), NOTICE reference the Outdoor Crest Supplemental

Manual for further information.

Vent, air piping and termination:

The Crest vent and air piping can be installed through the roof or through a sidewall. Follow the procedures in this manual for the method chosen. Refer to the information in this manual to determine acceptable vent and air piping length.

Air contamination

Pool and laundry products and common household and hobby products often contain fluorine or chlorine compounds. When these chemicals pass through the boiler, they can form strong acids. The acid can eat through the boiler wall, causing serious damage and presenting a possible threat of flue gas spillage or boiler water leakage into the building.

Please read the information given in Table 1A, page 9, listing contaminants and areas likely to contain them. If contaminating chemicals will be present near the location of the boiler combustion air inlet, have your installer pipe the boiler combustion air and vent to another location, per this manual.

If the boiler combustion air inlet is locatedWARNING in a laundry room or pool facility, for

example, these areas will always contain hazardous contaminants.

To prevent the potential of severe personalWARNING injury or death, check for areas and products

listed in Table 1A, page 9 before installing the boiler or air inlet piping.

If contaminants are found, you MUST:

Remove products permanently. —OR—

Relocate air inlet and vent terminations to other areas.

19

Installation & Operation Manual

2 General venting

Common venting

Crest boilers may be common vented; however, the following criteria MUST BE followed:

1.Only Crest boilers may be connected to common flue applications. DO NOT mix other manufacturer’s appliances or other Lochinvar models. Common air intake is not allowed.

2.Crest boilers connected to the common vent must all be of the same size.

3.Each Crest boiler must have a Lochinvar supplied flue damper installed (see Table 2D).

4.A condensate drain must be installed above the flue damper.

5.Only vertical direct vent, positive pressure, Category IV or vertical/chimney vent, negative pressure, Category II may be used when common venting Crest boilers. Sidewall venting is not allowed.

6.Crest boilers in a common vent must be connected and controlled with the integral Crest SMART TOUCH Cascade.

a.The Leader may be controlled through the Crest SMART TOUCH control through BMS (external 0 - 10V signal), ModBus or its own internally calculated set point.

b.The Cascade (Members) must be controlled by the Crest Leader boiler using the Lead/Lag Cascade option.

For approved common vent sizing, contact the factory.

WARNING When Crest boilers are common vented, the criteria above MUST BE followed.

Failure to follow all these requirements will result in severe personal injury, death, or substantial property damage.

NOTICE

When Crest boilers are common vented,

hot water generators MUST BE piped

 

 

to the primary heating loop and tank

 

thermostats must not be connected to the

 

Crest.

NOTICE

A field supplied inline condensate

collection section MUST BE installed

 

 

directly above the backflow preventer.

NOTICE

When using polypropylene common vent

on Models 751 - 3501, a field supplied

 

 

polypropylene to stainless steel adapter

 

MUST BE installed between the backflow

 

preventer and the unit connection.

Table 2D Flue Damper Kits

Flue Damper Kits

Model

Damper Size

Kit Number

FB0751

6"

100056142

FB1001

6"

100056142

FB1251

8"

100141561

FB1501

8"

100141561

FB1751

8"

100141561

FB2001

8"

100141561

FB2501

9"

100141562

FB3001

10"

100141563

FB3501

10"

100141563

FB4001

12"

100141564

FB5001/6001

14"

100141565

PVC/CPVC (Models 751 - 3501 only)

This product has been approved for use with the PVC/CPVC vent materials listed in Table 2E on page 21.

NOTICE

Factory installed vent connections are sized

for stainless steel venting.

 

Installing vent and air piping

WARNING

NOTICE

The vent connection to the appliance must be made with a minimum of 10 equivalent feet of CPVC pipe (field provided). The field provided vent fittings must be cemented to the CPVC pipe section using an “All Purpose Cement” suitable for PVC and CPVC pipe. Use only the vent materials, primer, and cement specified in Table 2E to make the vent connections. Failure to follow this warning could result in fire, personal injury, or death.

Use only cleaners, primers, and solvents that are approved for the materials which are joined together.

NOTICE

All PVC vent pipes must be glued, properly

supported, and the exhaust must be

 

 

pitched a minimum of a 1/4 inch per foot

 

back to the boiler (to allow drainage of

 

condensate).

WARNING

NOTICE

Insulation should not be used on PVC or CPVC venting materials. The use of insulation will cause increased vent wall temperatures, which could result in vent pipe failure.

CPVC vent or stainless steel pipe and vent fittings must be used in closet and alcove installations.

20

2 General venting (continued)

Table 2E PVC/CPVC Vent Pipe and Fittings

Approved PVC/CPVC Vent Pipe and Fittings

Item

Material

Standard

 

PVC Schedule 40, 80

ANSI/ASTM D1785

Vent pipe

PVC - DWV

ANSI/ASTM D2665

 

CPVC Schedule 40, 80

ANSI/ASTM F441

 

PVC Schedule 40

ANSI/ASTM D2466

Vent fittings

PVC Schedule 80

ANSI/ASTM D2467

CPVC Schedule 80

ANSI/ASTM F439

 

PVC - DWV

ANSI/ASTM D2665

Pipe Cement /

PVC

ANSI/ASTM D2564

Primer

CPVC

ANSI/ASTM F493

NOTICE: DO NOT USE CELLULAR (FOAM) CORE PIPE

NOTE: In Canada, CPVC and PVC vent pipe, fittings and cement/ primer must be ULC-S636 certified.

1.Work from the boiler to vent or air termination. Do not exceed the lengths given in this manual for the air or vent piping.

2.

Cut pipe to the required lengths

and

deburr the

inside

 

and outside of the pipe ends.

 

 

 

3.

Chamfer outside of each pipe

end

to ensure

even

 

cement distribution when joining.

 

 

 

4.Clean all pipe ends and fittings using a clean dry rag. (Moisture will retard curing and dirt or grease will prevent adhesion.)

Figure 2-2 Near Boiler PVC/CPVC Venting (Flue connections from the factory are sized for stainless steel venting.)

Installation & Operation Manual

5.Dry fit vent or air piping to ensure proper fit up before assembling any joint. The pipe should go a third to two-thirds into the fitting to ensure proper sealing after cement is applied.

6.Priming and Cementing:

a.Handle fittings and pipes carefully to prevent contamination of surfaces.

b.Apply a liberal even coat of primer to the fitting socket and to the pipe end to approximately 1/2" beyond the socket depth.

c.Apply a second primer coat to the fitting socket.

d.While primer is still wet, apply an even coat of approved cement to the pipe equal to the depth of the fitting socket along with an even coat of approved cement to the fitting socket.

e.Apply a second coat of cement to the pipe.

f.While the cement is still wet, insert the pipe into the fitting, if possible twist the pipe a 1/4 turn as you insert it. NOTE: If voids are present, sufficientcementwasnotappliedandjointcould be defective.

g.Wipe excess cement from the joint removing ring or beads as it will needlessly soften the pipe.

PVC PIPE

(FIELD SUPPLIED)

PVC COUPLING (FIELD SUPPLIED)

MINIMUM OF 10 EQUIVALENT FEET OF CPVC

(FIELD SUPPLIED)

STAINLESS ADAPTER (FIELD SUPPLIED)

DIR #2000557608 00

NOTE: CPVC VENT OR STAINLESS STEEL

PIPE AND VENT FITTINGS MUST BE USED

IN CLOSET AND ALCOVE INSTALLATIONS.

21

Installation & Operation Manual

2 General venting

Polypropylene (Models 751 - 3501 only)

This product has been approved for use with polypropylene vent with the manufacturers listed in Table 2F.

NOTICE

Factory installed vent connections are sized

for stainless steel venting.

 

All terminations must comply with listed options in this manual and be a single-wall vent offering.

For support and special connections required, see the manufacturer's instructions. All vent is to conform to standard diameter and equivalent length requirements established.

When determining equivalent combustion air and vent length for polypropylene single-wall piping contact the manufacturer.

Table 2F Polypropylene Vent Pipe and Fittings

Approved Polypropylene Vent Manufacturers

Make

Model

Centrotherm Eco Systems

InnoFlue SW/Flex

Duravent (M & G Group)

PolyPro Single-Wall / PolyPro Flex

WARNING

Use only the adapters and vent system listed

 

in Tables 2F and 2G. DO NOT mix vent

 

 

systems of different types or manufacturers.

 

Failure to comply could result in severe

 

personal injury, death, or substantial

 

property damage.

NOTICE

Installations must comply with applicable

national, state, and local codes. For

 

 

Canadian installation, polypropylene vent

 

must be listed as a ULC-S636 approved

 

system.

NOTICE

Installation of a polypropylene vent system

should adhere to the vent manufacturer’s

 

 

installation instructions supplied with the

 

vent system.

Figure 2-3 Near Boiler Polypropylene Venting

NOTICE

The installer must use a specific vent starter

adapter at the flue collar connection. The

 

 

adapter is supplied by the vent manufacturer

 

to adapt to its vent system. See Table 2F for

 

approved vent adapters.

POLYPROPYLENE PIPE (FIELD SUPPLIED)

POLYPROPYLENE ADAPTER (FIELD SUPPLIED)

NOTICE

All vent connections MUST be secured by

the vent manufacturer's joint connector

 

 

(FIG. 2-3).

WARNING Insulation should not be used on polypropylene venting materials. The use

of insulation will cause increased vent wall temperatures, which could result in vent pipe failure.

Table 2G Approved Polypropylene Terminations

IMG01148

MODELS 751 - 1001

POLYPROPYLENE

PIPE (FIELD SUPPLIED)

POLYPROPYLENE

ADAPTER (FIELD

SUPPLIED)

IMG01149

MODELS 1251 - 3501

Model

Manufacturer

Vent Model

Vent Type

Adapter Number

Joint Connector

Sidewall Kit*

Retaining Bracket /

Adapter*

 

 

 

 

 

 

 

 

Centrotherm

Innoflue

Single-Wall

ISSA0606

--

--

IATP0606 /

751-1001

Eco Systems

 

Flex

 

 

 

ISTAGL0606

 

DuraVent

PolyPro

Single-Wall

FSA-06M-6PPF

--

6PPS-HLKL

--

 

(M & G)

 

Flex

 

 

 

 

 

Centrotherm

Innoflue

Single-Wall

ISSA0808

--

--

--

1251-2001

Eco Systems

 

 

 

 

 

 

DuraVent

PolyPro

Single-Wall

FSA-08M-8PPF

--

8PPS-HSTL

--

 

(M & G)

 

 

 

 

 

 

 

2501

--

--

--

--

--

--

--

 

 

 

 

 

 

 

 

3001-3501

Centrotherm

Innoflue

Single-Wall

ISSA1010

--

--

--

Eco Systems

4001

N/A

N/A

N/A

N/A

N/A

N/A

N/A

 

 

 

 

 

 

 

 

5001-6001

N/A

N/A

N/A

N/A

N/A

N/A

N/A

 

 

 

 

 

 

 

 

* These parts

are only needed

if the sidewall

termination assembly is used (see FIG. 4-1C on page 26).

 

 

22

3 Vertical direct venting

Vent/air termination – vertical

WARNING Follow instructions below when determining vent location to avoid possibility of severe

personal injury, death or substantial property damage.

WARNING Do not connect any other appliance to the vent pipe or multiple boilers to a common

vent pipe except as noted in Section 2 on page 20. Failure to comply could result in severe personal injury, death, or substantial property damage.

NOTICE Installation must comply with local requirements and with the National Fuel

Gas Code, NFPA 54 / ANSI Z223.1 - latest edition for U.S. installations or CSA B149.1

Installation Code for Canadian installations.

Determine location

Locate the vent/air terminations using the following guidelines:

1.The total length of piping for vent or air must not exceed the limits given in the General Venting Section on page 18 of this manual.

2.The vent must terminate at least 3 feet above the highest place in which the vent penetrates the roof and at least 2 feet above any part of a building within 10 horizontal feet.

3.The air piping must terminate in a down-turned 180° return pipe no further than 2 feet (.6 m) from the center of the vent pipe. This placement avoids recirculation of flue products into the combustion air stream.

4.The vent piping must terminate in an up-turned coupling as shown in FIG. 3-1. The top of the coupling or the rain cap must be at least 36" (914 mm) above the air intake. The air inlet pipe and vent pipe can be located in any desired position on the roof, but must always be no further than 2 feet (.6 m) apart and with the vent termination at least 36" (914 mm) above the air intake.

WARNING Rooftop vent and air inlet terminations must terminate in the same pressure zone,

unless vertical vent sidewall air is set up as shown in the General Venting - Vertical Vent, Sidewall Air Section.

Figure 3-1 Vertical Termination of Air and Vent

 

BIRD SCREEN

 

[TYPICAL]

VENT OUTLET

VENT

 

36" MINIMUM

12" [305 MM] MINIMUM

ABOVE AIR INLET

ABOVE ROOF /

 

 

SNOW LINE

 

COMBUSTION AIR

Installation & Operation Manual

Figure 3-2 Vertical Termination of Air and Vent w/Rain Cap

5.Locate terminations so they are not likely to be damaged by foreign objects, such as stones or balls, or subject to buildup of leaves or sediment.

Prepare roof penetrations

1.Air pipe penetration:

a.Cut a hole for the air pipe. Size the air pipe hole as close as desired to the air pipe outside diameter.

2.Vent pipe penetration:

a.Cut a hole for the vent pipe. For either combustible or noncombustible construction, size the vent pipe hole per the vent manufacturer’s instructions.

b.Insert a galvanized metal thimble in the vent pipe hole (when required by local codes).

3.Space the air and vent holes to provide the minimum spacing shown in FIG. 3-1.

4.Follow all local codes for isolation of vent pipe when passing through floors, ceilings, and roofs.

5.Provide flashing and sealing boots sized for the vent pipe and air pipe.

Termination and fittings

1.Prepare the vent termination coupling and the air termination elbow (FIG. 3-1) by inserting bird screens. Bird screens should be obtained locally.

2.The air piping must terminate in a down-turned 180° return bend as shown in FIG. 3-1. Locate the air inlet pipe no further than 2 feet (.6 m) from the center of the vent pipe. This placement avoids recirculation of flue products into the combustion air stream.

23

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