Desa LSFG20NT Original instructions

For more information, visit www.desatech.com

WARNING: If the information in this manual is not fol-

lowed exactly, a re or explosion may result causing

property damage, personal injury or loss of life.

— Do not store or use gasoline or other ammable

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 re

department.

— Installation and service must be performed by a quali-

ed installer, service agency or the gas supplier.

INSTALLER: Leave this manual with the appliance

CONSUMER: Retain this manual for future reference.

UNVENTED (VENT-FREE) SOLAR FUSION GAS HEATER

SAFETY INFORMATION AND INSTALLATION MANUAL

RESIDENTIAL

MODELS

SF20NT, SF20PT,

LSF20NT, LSF20PT,

VSF20NT, VSF20PT,

SF30NT, SF30PT,

LSF30NT, LSF30PT,

VSF30NT, VSF30PT

GARAGE MODELS

LSFG20NT, LSFG20PT,

REM20NT, REM20PT,

SFG20NT, SFG20PT,

SPC20NT, SPC20PT,

VSFG20NT, VSFG20PT

www.desatech.com 116307-01C2

WARNING: Improper installation, adjustment, altera-

tion, service or maintenance can cause injury or prop-

erty damage. Refer to this manual for correct installation

and operational procedures. For assistance or addi-

tional information consult a qualied installer, service

agency or the gas supplier.

WARNING: This is an unvented gas-red heater. It uses

air (oxygen) from the room in which it is installed. Provi-

sions for adequate combustion and ventilation air must

be provided. Refer to Air for Combustion and Ventilation

section on page 5 of this manual.

This appliance may be installed in an aftermarket,* per-

manently located, manufactured (mobile) home, where

not prohibited by local codes.

This appliance is only for use with the type of gas indi-

cated on the rating plate. This appliance is not convert-

ible for use with other gases.

* Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer

State of Massachusetts: The installation must be made by a licensed plumber or gas tter in the

Commonwealth of Massachusetts.

Sellers of unvented propane or natural gas-red supplemental room heaters shall provide to each

purchaser a copy of 527 CMR 30 upon sale of the unit.

Vent-free gas products are prohibited for bedroom and bathroom installation in the Common-

wealth of Massachusetts.

TABLE OF CONTENTS

Safety Information ............................................... 3

Local Codes......................................................... 4

Product Identication........................................... 4

Unpacking............................................................ 4

Product Features................................................. 4

Air For Combustion and Ventilation ..................... 5

Installation ........................................................... 7

Operating Heater............................................... 12

Inspecting Heater .............................................. 14

Cleaning and Maintenance................................ 15

Troubleshooting................................................. 16

Technical Service............................................... 19

Service Publications .......................................... 19

Service Hints ..................................................... 19

Specications .................................................... 20

Accessories ....................................................... 21

Replacement Parts............................................ 21

Parts Central...................................................... 21

Illustrated Parts Breakdown and Parts List........ 22

Warranty Information ......................................... 24

SAFETY INFORMATION

www.desatech.com 3116307-01C

SAFETY INFORMATION

WARNING: This product con-

tains and/or generates chemicals

known to the State of California

to cause cancer or birth defects

or other reproductive harm.

IMPORTANT: Read this owner’s

manual carefully and completely

before trying to assemble,

operate or service this heater.

Improper use of this heater can

cause serious injury or death

from burns, fire, explosion,

electrical shock and carbon

monoxide poisoning.

DANGER: Carbon monoxide

poisoning may lead to death!

Carbon Monoxide Poisoning: Early signs of carbon

monoxide poisoning resemble the u, with head-

aches, dizziness or nausea. If you have these signs,

the heater may not be working properly. Get fresh

air at once! Have heater serviced. Some people

are more affected by carbon monoxide than others.

These include pregnant women, people with heart

or lung disease or anemia, those under the inu-

ence of alcohol and those at high altitudes.

Natural and Propane/LP Gas: Natural and Propane/

LP gases are odorless. An odor-making agent is

added to these gases. The odor helps you detect a gas

leak. However, the odor added to the gas can fade.

Gas may be present even though no odor exists.

Make certain you read and understand all warn-

ings. Keep this manual for reference. It is your

guide to safe and proper operation of this heater.

WARNING: Any change to

this heater or its controls can

be dangerous.

WARNING: Do not use a

blower insert, heat exchanger

insert or other accessory not ap-

proved for use with this heater.

Due to high temperatures, the

appliance should be located out

of trafc and away from furniture

and draperies.

Do not place clothing or other

ammable material on or near

the appliance. Never place any

objects on the heater.

Surface of heater becomes very

hot when running heater. Keep

children and adults away from

hot surface to avoid burns or

clothing ignition. Heater will

remain hot for a time after shut-

down. Allow surface to cool

before touching.

Carefully supervise young chil-

dren when they are in the same

room with heater.

Make sure grill guard is in place

before running heater.

Keep the appliance area clear

and free from combustible ma-

terials, gasoline and other am-

mable vapors and liquids.

1. This appliance is only for use with the type

of gas indicated on the rating plate. This ap-

pliance is not convertible for use with other

gases.

2. Do not place propane/LP supply tank(s) in-

side any structure. Locate propane/LP supply

tank(s) outdoors.

3. This heater shall not be installed in a bedroom

or bathroom.

4. If you smell gas

• Shut off gas supply

• 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 re department

www.desatech.com 116307-01C4

5. This heater needs fresh, outside air ventilation

to run properly. This heater has an Oxygen

Depletion Sensing (ODS) safety shutoff

system. The ODS shuts down the heater if

not enough fresh air is available. See Air for

Combustion and Ventilation, page 5.

6. Keep all air openings in front and bottom of

heater clear and free of debris. This will insure

enough air for proper combustion.

7. If heater shuts off, do not relight until you

provide fresh, outside air. If heater keeps

shutting off, have it serviced.

8. Do not run heater

• where ammable liquids or vapors are used

or stored

• under dusty conditions

9. Do not use heater if any part has been under

water. Immediately call a qualied service

technician to inspect the room heater and to

replace any part of the control system and any

gas control which has been under water.

10. Turn off and unplug (if using electricity)

heater and let cool before servicing. Only a

qualied service person should service and

repair heater.

11. Operating heater above elevations of 4,500

feet (1,371 m) could cause pilot outage.

12.

To prevent performance problems, do not use

propane/LP fuel tank of less than 100 lbs. (45 kg)

capacity.

13. Before using furniture polish, wax, carpet

cleaner or similar products, turn heater off. If

heated, the vapors from these products may

create a white powder residue within burner

box or on adjacent walls or furniture.

14. Provide adequate clearances around air

openings.

LOCAL CODES

Install and use heater with care. Follow all local

codes. In the absence of local codes, use the lat-

est edition of The National Fuel Gas Code, ANSI

Z223.1/NFPA 54*.

*Available from:

American National Standards Institute, Inc.

1430 Broadway

New York, NY 10018

National Fire Protection Association, Inc.

Batterymarch Park

Quincy, MA 02269

SAFETY INFORMATION

Continued

Figure 1 - Vent-Free Gas Heater

Control Knob &

Ignitor Button

(inside door)

Front Panel

Grill

Guard

UNPACKING

1. Remove heater, front panel and grill from

carton. Set aside in a safe location.

2. Carefully remove refractory from heater and

remove packing material. Check refractory

for any damage. If the refractory is damaged

do not use. See Replacement Parts, page 21.

Set aside in a safe location.

3. Check heater for any damage. If heater is dam-

aged, promptly return to where you bought

heater.

PRODUCT FEATURES

SAFETY DEVICE

This heater has a pilot with an Oxygen Deple-

tion Sensing (ODS) safety shutoff system. The

ODS/pilot is a required feature for vent-free room

heaters. The ODS/pilot shuts off the heater if there

is not enough fresh air.

IGNITION SYSTEM

This heater has either a piezo ignitor or electronic

ignitor to light heater fuel supply.

THERMOSTATIC HEAT CONTROL

Thermostat models have a thermostat sensing

bulb and a control valve. This results in the great-

est heater comfort. This can also result in lower

gas bills.

PRODUCT

IDENTIFICATION

www.desatech.com 5116307-01C

AIR FOR COMBUSTION

AND VENTILATION

WARNING: This heater shall

not be installed in a conned

space or unusually tight con-

struction unless provisions are

provided for adequate combus-

tion and ventilation air. Read the

following instructions to insure

proper fresh air for this and

other fuel-burning appliances

in your home.

Today’s homes are built more energy efcient

than ever. New materials, increased insulation and

new construction methods help reduce heat loss

in homes. Home owners weather strip and caulk

around windows and doors to keep the cold air out

and the warm air in. During heating months, home

owners want their homes as airtight as possible.

While it is good to make your home energy ef-

cient, your home needs to breathe. Fresh air must

enter your home.All fuel-burning appliances need

fresh air for proper combustion and ventilation.

Exhaust fans, replaces, clothes dryers and fuel

burning appliances draw air from the house to

operate. You must provide adequate fresh air for

these appliances. This will insure proper venting

of vented fuel-burning appliances.

PROVIDING ADEQUATE

VENTILATION

The following are excerpts from National Fuel

Gas Code, ANSI Z223.1/NFPA 54, Section 5.3,

Air for Combustion and Ventilation.

All spaces in homes fall into one of the three fol-

lowing ventilation classications:

1. Unusually Tight Construction

2. Unconned Space

3. Conned Space

The information on pages 5 through 7 will help

you classify your space and provide adequate

ventilation.

Unusually Tight Construction

The air that leaks around doors and windows

may provide enough fresh air for combustion and

ventilation. However, in buildings of unusually

tight construction, you must provide additional

fresh air.

Unusually tight construction is dened as

construction where:

a. walls and ceilings exposed to the out-

side atmosphere have a continuous

water vapor retarder with a rating of

one perm (6 x 10-11 kg per pa-sec-m2) or

less with openings gasketed or sealed

and

b. weather stripping has been added on

openable windows and doors and

c. caulking or sealants are applied to

areas such as joints around window

and door frames, between sole plates

and oors, between wall-ceiling joints,

between wall panels, at penetrations

for plumbing, electrical and gas lines

and at other openings.

If your home meets all of these three cri-

teria, you must provide additional fresh

air. See Ventilation Air From Outdoors,

page 7.

If your home does not meet all of the three

criteria above, proceed to Determining

Fresh-Air Flow For Heater Location.

Conned and Unconned Space

The National Fuel Gas Code, ANSI Z223.1/NFPA

54 denes a conned space as a space whose

volume is less than 50 cubic feet per 1,000 Btu

per hour (4.8 m3per kw) of the aggregate input

rating of all appliances installed in that space and

an unconned space as a space whose volume is

not less than 50 cubic feet per 1,000 Btu per hour

(4.8 m3per kw) of the aggregate input rating of

all appliances installed in that space. Rooms com-

municating directly with the space in which the

appliances are installed*, through openings not

furnished with doors, are considered a part of the

unconned space.

* Adjoining rooms are communicating only if

there are doorless passageways or ventilation grills

between them.

DETERMINING FRESH-AIR FLOW

FOR HEATER LOCATION

Determining if You Have a Conned or

Unconned Space

Use this work sheet to determine if you have a

conned or unconned space.

Space: Includes the room in which you will install

heater plus any adjoining rooms with doorless pas-

sageways or ventilation grills between the rooms.

www.desatech.com 116307-01C6

1. Determine the volume of the space (length x

width x height).

Length x Width x Height =__________cu. ft.

(volume of space)

Example: Space size 20 ft. (6.1 m) (length) x

16 ft. (4.88 m) (width) x 8 ft. (2.44 m) (ceiling

height) = 2560 cu. ft. (volume of space)

If additional ventilation to adjoining room is

supplied with grills or openings, add the volume

of these rooms to the total volume of the space.

2. Multiply the space volume by 20 to determine

the maximum Btu/Hr the space can support.

__________ (volume of space) x 20 = (Maxi-

mum Btu/Hr the space can support)

Example:2560cu.ft. (72.4m3)(volumeofspace) x 20

= 51,200 (maximum Btu/Hr the space can support)

3. Add the Btu/Hr of all fuel burning appliances in

the space.

Vent-free heater _____________ Btu/Hr

Gas water heater* _____________ Btu/Hr

Gas furnace _____________ Btu/Hr

Vented gas heater _____________ Btu/Hr

Gas replace logs _____________ Btu/Hr

Other gas appliances* +____________ Btu/Hr

Total =____________ Btu/Hr

* Do not include direct-vent gas appliances. Di-

rect-vent draws combustion air from the outdoors

and vents to the outdoors.

Example:

Gas water heater _____________ Btu/Hr

Vent-free heater +____________ Btu/Hr

Total =____________ Btu/Hr

4. Compare the maximum Btu/Hr the space can

support with the actual amount of Btu/Hr used.

_________

Btu/Hr (maximum the space can support)

_________

Btu/Hr (actual amount of Btu/Hr used)

Example: 51,200 Btu/Hr (maximum the space

can support)

60,000 Btu/Hr (actual amount of

Btu/Hr used)

The space in the above example is a conned space

because the actual Btu/Hr used is more than the maxi-

mum Btu/Hr the space can support. You must provide

additional fresh air. Your options are as follows:

A. Rework worksheet, adding the space of an adjoin-

ing room. If the extra space provides an unconned

space, remove door to adjoining room or add

ventilation grills between rooms. See Ventilation

Air From Inside Building.

B. Vent room directly to the outdoors. See Ventila-

tion Air From Outdoors, page 7.

AIR FOR COMBUSTION

AND VENTILATION

Continued

C. Install a lower Btu/Hr heater, if lower Btu/Hr size

makes room unconned.

If the actual Btu/Hr used is less than the maximum

Btu/Hr the space can support, the space is an un-

conned space. You will need no additional fresh

air ventilation.

WARNING: If the area in

which the heater may be oper-

ated is smaller than that dened

as an unconned space or if the

building is of unusually tight

construction, provide adequate

combustion and ventilation air

by one of the methods described

in the National Fuel Gas Code,

ANSI Z223.1/NFPA54 Section 5.3

or applicable local codes.

VENTILATION AIR

Ventilation Air From Inside Building

This fresh air would come from an adjoining un-

conned space. When ventilating to an adjoining

unconned space, you must provide two perma-

nent openings: one within 12" (30.4 cm) of the

ceiling and one within 12" (30.4 cm) of the oor

on the wall connecting the two spaces (see options

1 and 2, Figure 2). You can also remove door into

adjoining room (see option 3, Figure 2). Follow the

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

Section 5.3, Air for Combustion and Ventilation for

required size of ventilation grills or ducts.

40,000

20,000

60,000

Figure 2 - Ventilation Air from Inside

Building

Remove

Door into

Adjoining

Room,

Option 3

Ventilation Grills

Into Adjoining Room,

Option 2

12"

Ventilation

Grills

into Adjoining

Room,

Option 1

www.desatech.com 7116307-01C

AIR FOR COMBUSTION

AND VENTILATION

Continued

Ventilation Air From Outdoors

Provide extra fresh air by using ventilation grills

or ducts. You must provide two permanent open-

ings: one within 12" (30.4 cm) of the ceiling and

one within 12" (30.4 cm) of the oor. Connect

these items directly to the outdoors or spaces

open to the outdoors. These spaces include attics

and crawl spaces. Follow the National Fuel Gas

Code, ANSI Z223.1/NFPA 54, Section 5.3, Air for

Combustion and Ventilation for required size of

ventilation grills or ducts.

IMPORTANT: Do not provide openings for inlet

or outlet air into attic if attic has a thermostat-

controlled power vent. Heated air entering the attic

will activate the power vent.

Figure 3 - Ventilation Air from Outdoors

Outlet

Air

Ventilated

Attic

Outlet

Inlet

Air

Inlet Air Ventilated

Crawl Space

Crawl

Space

To Attic

INSTALLATION

NOTICE: This heater is intended

for use as supplemental heat.

Use this heater along with your

primary heating system. Do not

install this heater as your pri-

mary heat source. If you have a

central heating system, you may

run system’s circulating blower

while using heater. This will help

circulate the heat throughout the

house. In the event of a power

outage, you can use this heater

as your primary heat source.

WARNING: A qualied ser-

vice person must install heater.

Follow all local codes.

CHECK GAS TYPE

Use only the correct type of gas (natural or pro-

pane/LP). If your gas supply is not the correct gas

type, do not install heater. Call dealer where you

bought heater for proper type heater.

WARNING: This appliance

is equipped for (natural or pro-

pane/LP) gas. Field conversion

is not permitted.

INSTALLATION ITEMS

Before installing heater, make sure you have the

items listed below.

• for propane/LP gas, external regulator (supplied

by installer)

• piping from gas supply (check local codes)

• ex gas tubing

• sealant (resistant to propane/LP gas)

• equipment shutoff valve*

• ex gas line with 3/8" NPT tap

• ground joint union

• sediment trap

• tee joint

• pipe wrench

• for natural gas, test gauge connection*

* A CSA design-certied equipment shutoff valve

with 1/8" NPT tap is an acceptable alternative to

test gauge connection. The optional CSA design-

certied equipment shutoff valve can be purchased

from your dealer. See Accessories, page 21.

www.desatech.com 116307-01C8

LOCATING HEATER

WARNING: Maintain the

minimum clearances shown

in Figure 4. If you can, provide

greater clearances from oor,

ceiling and joining wall.

WARNING: Never install the

heater

• in a bedroom or bathroom

• in a recreational vehicle

• where curtains, furniture, cloth-

ing or other ammable objects

are less than 36" from the front,

top or sides of the heater

• as a replace insert

• in high trafc areas

• in windy or drafty areas

CAUTION: If you install the

heater in a home garage

• heater pilot and burner must be

at least 18" above oor

• locate heater where moving

vehicle will not hit it

CAUTION:Thisheatercreates

warm air currents. These currents

move heat to wall surfaces next

to heater. Installing heater next

to vinyl or cloth wall coverings

or operating heater where impu-

rities (such as, but not limited to,

tobacco smoke, aromatic candles,

cleaning uids, oil or kerosene

lamps, etc.) in the air exist, may

discolor walls or cause odors.

IMPORTANT: Vent-free heaters add moisture to

the air. Although this is benecial, installing heater

in rooms without enough ventilation air may cause

mildew to form from too much moisture. See Air for

Combustion and Ventilation, page 5. If high humid-

ity is experienced, a dehumidier may be used to

help lower the water vapor content in the air.

INSTALLATION

Continued

For convenience and efciency, install heater

• where there is easy access for operation, inspec-

tion and service

• in coldest part of room

Minimum

From

Sides Of

Heater

36" (91.4 cm)

14"

(35.6 cm)

minimum

FLOOR

CEILING

Minimum

Residential Heaters:

2" Minimum To Top

Surface Of Carpeting,

Tile Or Other

Combustible Material

Garage Heaters:

18" Minimum To

Garage Floor

Left

Side

Right

Side

6" (15.2 cm)

Figure 4 - Mounting Clearances As

Viewed From Front of Heater

INSTALLING HEATER TO WALL

Methods For Attaching Heater To Wall

Attach heater to wall in one of two ways:

1. Attaching to wall stud

2. Attaching to wall anchor

Attaching to Wall Stud: This method provides

the strongest hold. Insert mounting screws into

wall studs.

Attaching to Wall Anchor: This method allows you

to attach mounting screws to hollow walls (wall

areas between studs) or to solid walls (concrete

or masonry).

Figure 5 - Attaching Thermostat Sensing

Bulb

Clamp Thermostat

Sensing Bulb

THERMOSTAT SENSING BULB

The thermostat sensing bulb is located on the lower

rear panel of heater.

1. Place clamp on thermostat sensing bulb as

shown in Figure 5. Clamp is provided in

hardware package.

2. Snap clamp into mounting hole as shown in

Figure 5. Mounting hole is located in the center

of lower back panel of heater. Make sure the

thermostat sensing bulb is horizontal.

www.desatech.com 9116307-01C

INSTALLATION

Continued

Decide which method better suits your needs. Either

method will provide a secure hold for the heater.

Marking Screw Locations

WARNING: Maintain mini-

mum clearances shown in

Figure 4. If you can, provide

greater clearances from oor

and joining wall.

Mark three screw locations on wall as shown

in Figure 6).

Figure 6 - Wall Mounting Clearances

18 3/4"

Min.

20,000 Btu Heaters

16 7/8"

30,000 Btu Heaters

24 5/16"

Adjoining Wall

Insert

Mounting

Screws

Floor

Locate hardware packet behind left side door

of heater.

Attaching To Wall Stud Method

For attaching heater to wall studs

1. Drill holes at marked locations using 9/64"

drill bit. Holes must be level to prevent com-

plications with front panel.

2. Tighten screws until screw head is 1/8" away

from wall.

Attaching To Wall Anchor Method

For attaching heater to hollow walls (wall areas be-

tween studs) or solid walls (concrete or masonry).

1. Drill holes at marked locations using 5/16"

drill bit. Holes must be level to prevent com-

plications with front panel. For solid walls

(concrete or masonry), drill at least 1" deep.

2. Fold wall anchor as shown in Figure 7.

3. Insert wall anchor (wings rst) into hole. Tap

anchor ush to wall.

4. For thin walls (1/2" or less), insert red key

into wall anchor. Push red key to “pop” open

anchor wings. IMPORTANT: Do not hammer

key! For thick walls (over 1/2" thick) or solid

walls, do not pop open wings.

Placing Heater On Mounting Screws

1. Locate two top vertical key slots on back end

panels of heater.

2. Place heater onto mounting screws.

Figure 7 - Folding

Anchor

Figure 8 - Popping

Open Anchor Wings

For Thin Walls

Figure 9 - Vertical Key Slots for Mounting

Heater to Wall

Vertical

Key Slots

5. Insert mounting screws into wall anchors.

6. Tighten screws until screw head is 1/8" away

from wall.

CONNECTING TO GAS SUPPLY

WARNING: This appliance

requires a 3/8" NPT (National

Pipe Thread) inlet connection to

the pressure regulator.

WARNING: A qualied service

person must connect heater to gas

supply. Follow all local codes.

WARNING: For natural

gas, never connect heater to

private (non-utility) gas wells.

This gas is commonly known

as wellhead gas.

IMPORTANT: For natural gas, check gas line

pressure before connecting heater to gas line. Gas

line pressure must be no greater than 10.5" of wa-

ter. If gas line pressure is higher, heater regulator

damage could occur.

www.desatech.com 116307-01C10

Tee Joint

Reducer

Bushing

to 1/8"

NPT

1/8" NPT

Plug Tap

INSTALLATION

Continued

IMPORTANT: Install an equipment shutoff valve

in an accessible location. The equipment shutoff

valve is for turning on or shutting off the gas to

the appliance.

Apply pipe joint sealant lightly to male NPT

threads. This will prevent excess sealant from

going into pipe. Sealant in pipe could result in

clogged heater valves. Most ex gas tubing does

not require sealant. Read instructions supplied

with ex gas tubing.

WARNING: Use pipe joint

sealant that is resistant to liquid

petroleum (LP) gas.

* A CSA design-certied equipment shutoff valve

with 1/8" NPT tap is an acceptable alternative to

test gauge connection. Purchase the optional CSA

design-certied equipment shutoff valve from your

dealer. See Accessories, page 21.

Figure 11 - Gas Connection

Figure 10 - External Regulator With Vent

Pointing Down

External

Regulator

Propane/LP

Supply Tank

Vent

Pointing

Down

Pressure

Regulator

Test Gauge

Connection*

Cap Tee Pipe

Joint Nipple

3/8" NPT

Pipe Nipple

3/8" Male

Flare to NPT

Connector

Sediment Trap

Equipment

Shutoff

Valve*

3" Min

Natural Gas

From Gas Meter

(4" W.C. to 10.5"

W.C. Pressure)

Propane/LP

From External

Regulator

(11" W.C. to 14"

W.C. Pressure)

Flex Gas

Line

Pipe Joint

Sealant

Required

(NPT End)

Pipe Joint

Sealant

Required

(NPT End)

3/8" Male

Flare

to NPT

Connector

CAUTION: For propane/LP

gas, never connect heater di-

rectly to the propane/LP supply.

This heater requires an external

regulator (not supplied). Install

the external regulator between the

heater and propane/LP supply.

For propane/LP gas, the installer must supply an

external regulator. The external regulator will

reduce incoming gas pressure. You must reduce

incoming gas pressure to between 11" and 14" of

water. If you do not reduce incoming gas pressure,

heater regulator damage could occur. Install the

external regulator with the vent pointing down

as shown in Figure 10. Pointing the vent down

protects it from freezing rain or sleet.

CAUTION: Use only new,

black iron or steel pipe. Inter-

nally-tinned copper tubing may

be used in certain areas. Check

your local codes. Use pipe of

large enough diameter to allow

proper gas volume to heater. If

pipe is too small, undue loss of

volume will occur.

Typical Inlet Pipe Diameters

20,000 Btu/Hr Models - 3/8" or greater

30,000 Btu/Hr Models - 1/2" or greater

Installation must include equipment shutoff valve,

union and plugged 1/8" NPT tap. Locate NPT tap

within reach for test gauge hook up. NPT tap must

be upstream from heater (see Figure 11).

Rear View Hole

Provided

in Rear

Surround

This manual suits for next models

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