Desa CERAMIC PLAQUE Manuel utilisateur

SERVICE MANUAL

GRH/PV 005

VANGUARD FRONT

Do not store or use gasoline or other

flammable vapors and liquids in the

vicinity of this or any other appliance.

FOR YOUR SAFETY

WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

• Do not touch any electrical switch; do

not use any phone in your building.

• Immediately call your gas supplier

from a neighbor’s phone. Follow the

gas supplier’s instructions.

• If you cannot reach your gas supplier,

call the fire department.

WARNING: Improper installation, ad-

justment, alteration, service or mainte-

nancecancauseinjuryorpropertydam-

age. Refer to this manual for correct

installationandoperationalprocedures.

Forassistance oradditional information

consult a qualified installer, service

agency or the gas supplier.

G 009

Save this manual for future reference.

CERAMIC PLAQUE MODELS

VENT-FREE GAS HEATERS

VENT-FREE GAS HEATER SERVICE MANUAL

TABLE

CONTENTS

Section 1 - Safety Information

Safety Requirements .............................................................................................. 3

Warnings................................................................................................................. 3

Section 2 - Introduction

Technical Service Department ............................................................................... 4

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

Accessories ............................................................................................................ 4

Section 3 - General Operation and Component Descriptions

General Operation .................................................................................................. 5

Burner Assembly .................................................................................................... 5

Ignition System ....................................................................................................... 5

Control Valve .......................................................................................................... 6

Gas Regulator ........................................................................................................ 6

Oxygen Depletion System ...................................................................................... 6

Section 4 - Tools and Equipment ................................................................................. 7

Section 5 - Installation

Gas Type ................................................................................................................ 8

Location: Safety Precautions .................................................................................. 8

Gas Supply Installation ........................................................................................... 9

Propane Installation ................................................................................................ 10

External Regulators ................................................................................................ 10

Section 6 - Test Procedures

Testing Gas Supply Line Connections ................................................................... 11

Testing Heater Gas Connections ........................................................................... 11

Correcting Leaks .................................................................................................... 11

Testing Control Valve and Thermocouple .............................................................. 12

Section 7 - Specifications............................................................................................. 13

Section 8 - Troubleshooting

Ignition Problems

No Spark................................................................................................................. 14

Ignitor Sparks, But Pilot Will Not Light .................................................................... 15

Pilot Lights, But Will Not Stay Lit ............................................................................ 16,17

Main Burner Does Not Light (pilot stays lit) ........................................................... 18

Delayed Ignition Of Main Burner ............................................................................ 18

Combustion Problems

Backfiring During Operation ................................................................................... 19

Smoke or Unwanted Odors .................................................................................... 19

Gas Odor ................................................................................................................ 19

Service Information ...................................................................................................... Back Page

VENT-FREE GAS HEATER SERVICE MANUAL

SECTION SAFETY INFORMATION

DANGER

Carbon monoxide poisoning may lead to death!

This service manual is intended for use by

individuals with adequate electrical and me-

chanical skills. Attempts to repair this heater by

WARNING ICON G 001

WARNINGS

IMPORTANT: Read the 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

fire, explosion, electrical shock, electrocution, and carbon monoxide poisoning.

Early signs of carbon monoxide poisoning resemble the flu, with headaches, dizziness, and/or

nausea. If you have these signs, the heater may not be working properly. Get fresh air at once!

Haveheater serviced.Some people such as pregnant women, personswith heartor lungdisease,

persons with anemia, those under the influence of alcohol, and those at high altitudes are more

affected by carbon monoxide than others. Make certain you read and understand all Warnings.

KeeptheOwner’s Manualfor reference. Itis your guideto safeandproper operationof this heater.

1. Use only propane gas for models designated as propane.

2. Use only natural gas for models designated as natural.

3. If using propane model, do not place propane supply tank inside any structure. The

propane supply tank must be located outdoors.

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 fire department.

5. Never install the heater

• in sleeping quarters, a mobile home, or a recreational vehicle

• where curtains, furniture, clothing, or other flammable objects are less than 36 inches

from the front, top, or sides of the heater

• as a fireplace insert

• in high traffic areas

• in windy or drafty areas

6. Always run heater at LOW, THERMOSTAT/MEDIUM, or HIGH locked positions. Never set

controlknobbetweenlockedpositions.Poorcombustionandhigherlevelsofcarbonmonoxide

may result.

7. Open window to admit fresh, outside air when using heater. Open window one (1) or two (2)

inches. When used without fresh, outside air, heater may give off carbon monoxide gas.

8. Never run heater in small, closed room. Open door into next room to help ventilate.

9. If heater shuts off, do not relight until you provide fresh, outside air. If heater keeps shutting

off, have it serviced.

10. Do not run heater

• where flammable liquids or vapors are used or stored

• under dusty conditions

11. Never place any objects on the heater.

12. Surface of heater becomes very hot when running heater. Keep children and adults away

from hot surface. Heater will remain hot for a time after shutdown. Allow surface to cool

before touching.

13. Make sure grill guard is in place before running heater.

14. Do not alter heater or its controls. Any change may create a safety hazard.

15. Make sure heater is turned off, unplugged, and cool before servicing.

WARNING ICON G 001

Safety Requirements

individuals without those skills can result in

personal injury as well as property damage.

VENT-FREE GAS HEATER SERVICE MANUAL

NOTE:ThisnumberisONLYfortechnicalserv-

iceassistance and CANNOT be usedfor order-

ingparts,billingquestions,orderstatus,etc.For

salesdepartmentandpartsordering,call1-502-

781-9600.

SECTION Technical Service Department

The Technical Service Department, located in

Bowling Green, Kentucky, is committed to as-

sistingourAuthorizedServiceCentersandDeal-

ers to provide prompt, efficient service. If you

needassistanceorhavequestionsaboutservic-

ing problems, please call DESA International’s

Technical Service Department at 1-800-323-

5190.

INTRODUCTION

For accessories, contact authorized dealers of this product. If they are unable to supply

accessory parts, call DESA International at 1-502-781-9600.

Figure 1. Optional Fan Kit Figure 2. Optional Floor Mounting Stand

A 007FAN ACCESSORY-GRH

A 005

OPTIONAL FLOOR MOUNT-GRH

Accessories

The following accessories are available from

DESA International:

1. Fan Kit GA2100A. The fan accessory pro-

vides better heat distribution in the room.

2. Floor Mounting Stand GA4000 (3-plaque

models) and GA4010 (5-plaque models).

The floor stand allows the heater to be

installed away from a wall.

Product Features

The ceramic plaque heaters covered by this

servicemanual havemany features that assure

customer satisfaction and comfort.

•

Infra-red Heat:

The glowing ceramic burner

plaquesgiveoffinfra-redradiantlightwhich

travels through the air and heats nearby

objects.

•

Variable Heat Output:

The non-thermostat

heaters can be adjusted to one of three

alternative heat settings to provide user

comfort. The thermostat heaters can be

adjusted to the desired heat setting to per-

miteconomicaluse.Intheeventofapower

outage, the heater can be operated manu-

ally on high or low.

•

Piezo Electric Ignition:

The heater can be

started and operated without matches or

otherexternalmeans.Thepilotisignitedby

asparkcreatedfromthepiezoignitorwhen

thecontrolknobisdepressedandturnedto

the “PILOT”position.

•

Oxygen Depletion System:

The heater is

designed to shut off if the oxygen level in

the room falls to an unacceptable level.

VENT-FREE GAS HEATER SERVICE MANUAL

SECTION

3GENERAL OPERATION AND COMPONENT DESCRIPTIONS

“PILOT”position so that the heater is ready to

use.

Turning the control knob operates the control

valve and directs the flow of gas to the pilot and

the burner plaques. The gas is mixed with air

andisinjectedintotheburnerchambersthrough

tubes in the bottom of the burner. The air/gas

mixture burns on the surface of the ceramic

burnerplaques,causingtheceramicplaquesto

glow with a radiant orange color. With proper

careandservicing,theheatershouldgivemany

years of satisfactory use to the customer. Be

sure to inspect and service the heater at least

annually.

General Operation

NOTE: See Owner’s Manual for operating

procedure.

The heater is operated by the control knob

locatedonthetopoftheheater.Besurethatthe

servicesupplyvalveisopenandthatthemanual

shut-off valve (Figure 8, page 9) is fully open.

Depressingthecontrolknobandturningittothe

“PILOT”position will direct gas to the pilot and

provide a spark to light the pilot. The control

knob must be held down (at least 10 seconds)

untilthe thermocouple is heated enoughto hold

the valve open. Once the pilot flame is

established, the control knob can be released

and turned to any of the operating position

settings.The control knob can also be left in the

Ignition System

The ignitor assembly utilizes a piezo electric

ignitionsystem.Thespark gen-

erator is built into the con-

trol valve and will pro-

vide a spark to the pi-

lot when the control

knob is fully de-

pressed and turned

fromthe “OFF”position to the “PILOT”position.

The resulting high voltage spark ignites the gas

atthepilottube.Thepilotflamewill

in turn light the main burners

when the control knob is

rotated to the desired

heat setting.

Burner Assembly

The burner assembly is constructed of a plated

steel burner case with ceramic plaques ce-

mented into the face. A metal frame assures

uniform spacing between the plaques. The gas

orificesaremountedat thebottomofthe air/gas

inlet tubes. The air/gas mixture is distributed to

the plaques through the steel burner chambers

and through the small holes in the ceramic

plaques. The air/gas mixture burns near the

surface of the ceramic plaques, resulting in the

production of both radiant and convected heat.

GRH/P027

IGNITION SYSTEM

Figure 3. Ignition System

Pilot

Control

Valve

VENT-FREE GAS HEATER SERVICE MANUAL

GRH/P 029

O.D.S.

GAS REGULATOR GRH/P 032

GRH/P028

Gas Valve

Oxygen Depletion System (O.D.S.)

The pilot burner is designed to produce a preci-

sionflamewhichwillliftoffofthepilot

thermocouple if the oxy-

gen content of the sur-

roundingairistoolow.

Theresultingcooling

of the pilot thermo-

Figure 6. Oxygen Depletion System

Control Valve

The control valve directs the flow of gas to the

pilot burner and the main burners. The con-

trol knob should be slightly depressed and

rotatedto select the appropriateheatset-

ting, the “PILOT”setting or to turn the

heater off.

The control valve will maintain gas

flow to the main burner and the pilot

burner only if the thermocouple which

is mounted on the pilot burner is suffi-

ciently heated. The heated thermo-

coupleprovidesalowlevelelectriccurrenttoan

electromagnetic plunger in the control valve.

This low level electric current keeps the

plunger open allowing gas to flow to the

pilotandthemainburner.Ifthepilot

flame is extinguished, or if the

pilot flame lifts off of the

thermocouple due to lack of

oxygen,theelectriccurrentto

thevalve will be reduced and the plunger will

close,shuttingoffallgasflowtotheheater.

Gas Regulator

Thegasregulatorisusedtoreducetheincoming

gaspressuretotheappropri-

ate pressure for proper op-

eration of the heater. The

regulator pressure is preset

and cannot be adjusted.

NOTE: Propane heaters also require an exter-

nal regulator (11"-14" W.C.) be in-

stalled. The external regulator is not

supplied with the heater.

Figure 4. Control Valve

Figure 5. Gas Regulator

couple will cause the control valve to close,

shutting off all gas flow to the

heater.The oxygendeple-

tionsystemisrequired

onallmodelsofvent-

freeheaterscovered

by this manual.

Pilot

Control

Valve

VENT-FREE GAS HEATER SERVICE MANUAL

SECTION Tools You May Need

Phillips Screwdriver

Slotted Screwdriver

1/4 inch (Socket) Nutdriver

5/16 inch (Socket) Nutdriver

5/16 inch Open End Wrench

5/8 inch Open End Wrench

7/8 inch Open End Wrench

9 mm Open End Wrench

10 mm Open End Wrench

11 mm Open End Wrench

13 mm Open End Wrench

15/64 inch Ignition Wrench (Orifices)

1/16 inch Punch

Needle Nose Pliers

Equipment

The following items are recommended for

servicing, troubleshooting, or installing vent-

free gas heaters:

Source Information

Controls, Inc.

P.O. Box 52275

Raleigh, North Carolina

1-800-334-5886

Item: ESL-16

Approximate Cost: $14.00

DESA International

P.O. Box 90004

Bowling Green, KY 42102-9004

502-781-9600

Item: GA5000

Controls, Inc.

P.O. Box 52275

Raleigh, North Carolina

1-800-334-5886

Item: 78060

Approximate Cost: $40.00

DESA International

P.O. Box 90004

Bowling Green, KY 42102-9004

502-781-9600

Item: GA5010

TOOLS AND EQUIPMENT

Item

1. Water Manometer

(For Inlet and Mani-

fold Pressure Testing)

2. BASO Millivolt Test Kit.

(For Testing Valves

and Thermocouples)

3. Low Pressure Test Set

(For Leak Testing Gas

Supply Line To Heater)

4. Manual Shutoff Valve With

1/8" NPT Tap. (For

Installing Heater To Gas

Supply)

VENT-FREE GAS HEATER SERVICE MANUAL

SECTION INSTALLATION

For detailed installation instructions, see the

Owner’sOperation and InstallationManual that

is packaged with the heater.

*AvailablefromtheAmericanNationalStandards

Institute, Inc., 1430 Broadway, New York, NY

10018 or from the National Fire Protection

Association Inc., Batterymarch Park, Quincy,

MA 02269.

Before servicing the heater, be sure that the

installationconformstolocalcodesandallsafety

precautions outlined in the Owner’s Operation

and Installation Manual. In the absence of local

codes, the installation must conform with the

National Fuel Gas Code, ANSI Z223.1 1984,

and ADDENDA Z223.1a-1987 also known as

NFPA 54*. Only qualified (licensed or trained)

persons should install the product.

Location: Safety Precautions

Be sure that the following safety precautions

have been followed for locating the heater:

1. DONOTinstalltheheaterinsleepingquar-

ters,mobilehomesorrecreationalvehicles.

2. DO NOT install heater as afireplace insert.

3. The heater should be located to give easy

accessfor operation,servicing and inspec-

tion.

4. DO NOT install in areas where curtains,

drapes,clothingorotherflammablemateri-

alsarewithin36inchesofthe front, topand

sides of the heater.

5. This heater has been designed for wall

mounting. The clearances from the heater

to combustible surfaces MUST NOT be

less than shown in Figure 7. These are

absolute minimum clearances. Greater

clearances should be allowed if possible.

The heater can also be mounted to an

optional floor mounting base that is sold as

a separate accessory. If a base accessory

is used, be sure the base is securely at-

tached to the floor.

If the heater is installed in a residential garage,

the following precautions should be taken:

1. The heater pilot and burners must be at

least 18 inches above the floor.

2. The heater must be located or reasonably

protected, so as not to be subjected to

damage by a moving vehicle.

Wall or Base Mounting

SeeOwner’sManualfordetailedinstructionsfor

wall or base mounting.

Gas Type

Be sure that the type of gas supplied to the

heater is the same as that indicated on the

heater data plate. If you observe that the gas

supply is different than that specified on the

heater data plate, DO NOT operate the heater

until the correct gas supply is installed. Verify

that the regulator, burner orifices, and pilot as-

semblyareforthesamegastypeasisindicated

on the heater data plate (see

“SPECIFICA-

TIONS”

, page 13). DO NOT attempt to convert

a heater from one gas type to another (i.e.,

PropanetoNatural Gas or vice versa). Ifneces-

sary,replacetheheaterwithamodelsuitablefor

the type of gas being supplied.

Minimum

From

Sides Of

Heater

GRH/PV 011

EARANCE

36"

FLOOR

CEILING

Minimum

Minimum To Top Surface

Of Carpeting, Tile Or Other

Combustible Material

Left

Side Right

Side

Figure 7. Mounting Clearances As Viewed

From Front of Heater

VENT-FREE GAS HEATER SERVICE MANUAL

GRH/P 001A

GAS CONNECTION

Gas Supply Installation

1. Use only new, black iron or steel pipe.

Copper tubing may be acceptable in some

areas but should be internally tinned or

equivalently treated to resist corrosion by

sulphur compounds. CHECK LOCAL

CODES.

2. The gas supply line shall be sized and

installed to provide a sufficient supply of

gas to meet the maximum demand of the

heater without undue loss of pressure.

Model Installed Supply Line

3-Plaque Models 3/8 inch or greater

5-Plaque Models 1/2 inch or greater

3. The sealant used on the threaded joints of

the gas pipe must be the specific type

resistant to the action of liquid petroleum

(LP) gas. Apply sealant lightly to the male

threads to ensure excess sealant does not

enterthelines.Anyexcesssealantcouldbe

forced into the pipe and result in clogged

valves.

IMPORTANT: Pressure regulator

must be held with wrench when

connecting gas piping and/or fittings

to pressure regulator.

External Regulator

(For LP Heaters Only)

Drip Leg

(Trap)

Figure 8. Gas Connection

Manual Shut-off

Valve

Union

1/8" NPT Plug Tap

4. The supply system must include a manual

shut-off valve, a union in the line and a

plugged 1/8 inch NPT tap. The tap should

be accessible for test gauge connections

upstream of the gas supply connection to

the heater.

5. Include a drip leg (trap) in the supply line.

The purpose of the drip leg is to prevent

moisture and contaminants in the gas sup-

ply from entering the heater controls. The

drip leg should be within reach to permit

cleaning or emptying. A drip leg should not

be located where condensation is likely to

freeze.Failuretouseadriplegcanresultin

operational difficulties with the heater.

The gas supply to the heater must be regulated

to maintain the inlet pressure within the follow-

ing limits:

Models Gas Pressure

(Inches W.C.)

Natural Gas 7" Min. / 10.5" Max.

Propane 11" Min. / 14" Max.

VENT-FREE GAS HEATER SERVICE MANUAL

REGULATOR INSTALLATION GRH/PV 018

Propane Installations

CAUTION: Propane models require an

external regulator (not supplied with heater).

The external regulator must be connected be-

tween the heater and the propane supply tank.

Thisregulator mustreduce the incoming supply

pressure to a maximum of 14" W.C. Under no

circumstances should this heater ever be con-

nected directly to a propane supply tank.

A typical propane installation is shown (below

right)in Figure 9.For details concerning tank or

cylinder location and installation, refer to NFPA

Pamphlet No. 58 and the laws in your locality.

External Regulators - Vents

External regulators should be installed with the

vent pointing down as shown in Figure 9. Some

regulators have a so-called “drip lip”surround-

ing the vents which acts as a shield for the

recessed vent opening. This lip makes it more

difficult for freezing rain or sleet to plug a vent

that has been installed pointing down. Older

style vents may not have the lip and are far less

resistanttofreeze-up problems (see Figure10).

A regulator with the drip lip design installed

outdoors does not require additional protection

if the vent is pointing down, unless subjected to

upward splatter from rain.

Older regulators with the non-drip lip vent con-

structionrequireadditionalprotection,suchasa

hood, cover, encasement, etc. The external

regulatorshouldbeinstalledhighenoughabove

ground level (at least 18 inches) so that rain

splatter does not block or freeze the vent. Extra

protection for the vent may be needed in areas

where there is heavy snow fall.

Be sure the external regulator is installed in

accordance with NFPA No. 58 and any other

applicable local regulations, as well as the

manufacturer’s instructions.

DRIP LIP

GRH/P 026

Figure 9. Typical Propane Installation

Drip Lip No Drip Lip

Figure 10. Regulator Vent Drip Lips

3 FT

MIN

3 FT

MIN

3 FT

MIN

CYLINDER LOCATION GRH/PV 016

Supply

Tank

Regulator

WARNING ICON G 001

Manual Shutoff Valve

With 1/8" NPT Tap

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