Desa VN3000C, VN2550IT, VN1800IT, VN1800C User Manual

®

VENT-FREE NATURAL GAS HEATER

OWNER’S OPERATION AND INSTALLATION MANUAL

Models: VN1800C, VN1800IT, VN3000C, and VN2550IT

WARNING: 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.

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

—WHAT TO DO IF YOU SMELL GAS

•Do not try to light any appliance.

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

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

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

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

®

Save this manual for future reference.

CONTENTS

SAFETY INFORMATION

2

SECTION	PAGE
Safety Information .........................................................................	2
Product Identification ....................................................................	4
Local Codes ...................................................................................	4
Unpacking ......................................................................................	4
Product Features ............................................................................	4
Fresh Air For Combustion And Ventilation ..................................	5
Installing To Wall ..........................................................................	9
Connecting To Gas Supply ............................................................	14
Checking Gas Connections ............................................................	15
Operating Heater (Models VN1800IT & VN2550IT) ...................	17
Operating Heater (Models VN1800C & VN3000C) .....................	21
Inspecting Burner ..........................................................................	24
Cleaning And Maintenance ...........................................................	26
Troubleshooting .............................................................................	26
Technical Service ..........................................................................	30
Specifications ................................................................................	30
Service Publications ......................................................................	30
Service Hints .................................................................................	30
Replacement Parts .........................................................................	31
Accessories ....................................................................................	31
Illustrated Parts Breakdown and Parts List ...................................	32-39
Warranty Information ....................................................................	Back Cover

WARNINGS

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 flu, with headaches, 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, persons with heart or lung disease or anemia, those under the influence of alcohol, and those at high altitudes.

Natural Gas: Natural gas is odorless. An odor-making agent is added to natural gas. The odor helps you detect a natural gas leak. However, the odor added to natural gas can fade. Natural gas may be present even though no odor exists.

Make certain you read and understand all Warnings. Keep this manual for reference. It is your guide to safe and proper operation of this heater.

Safety Information continues on next page

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SAFETY
		WARNINGS Continued
INFORMATION		WARNING: Any change to this heater or its controls can be dangerous.
Continued		1. Use only natural gas. Do not convert heater to use different fuel type.
		2. 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
		3. This heater shall not be installed in a bedroom or bathroom.
		4. Never install the heater
		• in 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
		5. Always run heater with plaque control knob at the 1, 2, 3, or 4 locked posi-
		tions. Never set control knob between locked positions. Poor combustion and
		higher levels of carbon monoxide may result.
		6. This heater needs fresh, outside air ventilation to run properly. This heater
		has an oxygen depletion sensor (ODS) pilot light safety system. The ODS
		shuts down the heater if not enough fresh air is available. See Fresh Air for
		Combustion and Ventilation, pages 5 through 8.
		7. Never run heater in small, closed room. Open door into next room to help
		ventilate.
		8. If heater shuts off, do not relight until you provide fresh, outside air. If heater
		keeps shutting off, have it serviced.
		9. Do not run heater
		• where flammable liquids or vapors are used or stored
		• under dusty conditions
		10. Never place any objects on the heater.
		11. 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.
		12. Carefully supervise young children when they are in same room with heater.
		13. Make sure grill guard is in place before running heater.
		14. Do not use heater if any part has been under water. Immediately call a
		qualified 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.
		15. Turn off and unplug heater and let cool before servicing. Only a qualified
		service person should service and repair heater.
		16. Operating heater above elevations of 4,500 feet may cause pilot outage.
			3
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PRODUCT IDENTIFICATION

LOCAL CODES

UNPACKING

PRODUCT

FEATURES

4

Thermostat Control Knob (Models VN1800IT and VN2550IT Only)

	Piezo Ignitor (Models VN1800IT	Control Knob
	and VN2550IT Only)

Grill

Guard

Burners

Front

Panel

Heater

Cabinet

Figure 1 - Vent-Free Natural Gas Heater (Model VN2550IT Shown)

Install and use heater with care. Follow all local codes. In the absence of local codes, use the latest edition of National Fuel Gas Code ANSI Z223.1, also known as 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

1.Remove heater from carton.

2.Remove all protective packaging applied to heater for shipment.

3.Check heater for any shipping damage. If heater is damaged, promptly inform dealer where you bought heater.

Safety Device

This heater has a pilot with an Oxygen Depletion Sensor Shutoff System (ODS). 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.

Piezo Ignition System

This heater has a piezo ignitor. This system requires no matches, batteries, or other sources to light heater.

Thermostatic Heat Control

(Models VN1800IT and VN2550IT Only)

This heater has a thermostat sensing bulb and thermostat control. This results in the greatest heater comfort. This can also result in lower gas bills.

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FRESH AIR
		WARNING ICON G 001 WARNING
FOR		This heater must have fresh air for proper operation. If not, poor
COMBUSTION		fuel combustion could result. Read the following instructions to
		insure proper fresh air for this and other fuel-burning appliances
AND
		in your home.
VENTILATION
		Today’s homes are built more energy efficient 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 efficient, 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, fireplaces, 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.
		PRODUCING ADEQUATE VENTILATION
		All spaces in homes fall into one of the three following ventilation classifications:
		1. Unusually Tight Contruction; 2. Unconfined Space; 3. Confined Space.
		The information on pages 5 through 8 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 defined as construction where:
		a. walls and ceilings exposed to the outside atmosphere have a continu-
		ous water vapor retarder with a rating of one perm or less with open-
		ings 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 floors, 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 the three criteria above, you must provide addi-
		tional fresh air. See Ventilation Air From Outdoors, page 8.
		If your home does not meet all of the three criteria above, continued reading.
		Unconfined Space
		An unconfined space has a minimum air volume of 50 cubic feet for each 1000
		BTU/Hr input rating of all appliances in the space (cubic feet equals length x
		width x height of space). Include adjoining rooms only if there are doorless
		passageways or ventilation grills between the rooms.
		Confined Space
		A confined space has an air volume of less than 50 cubic feet for each 1000
		BTU/Hr input rating of all appliances in the space (cubic feet equals length x
		width x height of space). Include adjoining rooms only if there are doorless
		passageways or ventilation grills between the rooms.
			Continued			5

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FRESH AIR FOR COMBUSTION AND VENTILATION

Continued

6

DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION

Determining if You Have a Confined or Unconfined Space

Use this worksheet to determine if you have a confined or unconfined space.

Space: Includes the room in which you will install heater plus any adjoining rooms with doorless passageways or ventilation grills between the rooms.

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. (length) x 16 ft. (width) x 8 ft. (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.Divide the space volume by 50 cubic feet to determine the maximum BTU/Hr the space can support.

____________ (volume of space) ÷ 50 cu. ft. = (Maximum BTU/Hr

the space can support)
Example: 2560 cu. ft. (volume of space) ÷ 50 cu. ft. =	51.2 or 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 fireplace logs		___________________ BTU/Hr
Other gas appliances*	+ ___________________ BTU/Hr
Total	= ___________________ BTU/Hr
Example: Gas water heater		40,000		BTU/Hr
Vent-free heater	+	18,000		BTU/Hr
Total	=			BTU/Hr
			58,000

* Do not include direct-vent gas appliances. Direct-vent draws combustion air from the outdoors and vents to the outdoors.

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)
58,000	BTU/Hr (actual amount of BTU/Hr used)

The space in the above example is a confined space because the actual BTU/Hr used is more than the maximum 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 adjoining room. If the extra space provides an unconfined space, remove door to adjoining room or add ventilation grills between rooms. See Ventilation Air From Inside Building, page 7.

B.Vent room directly to the outdoors. See Ventilation Air From Outdoors, page 8.

C.Install a lower BTU/Hr heater, if lower BTU/Hr size makes room unconfined.

If the actual BTU/Hr used is less than the maximum BTU/Hr the space can support, the space is an unconfined space. You will need no additional fresh air ventilation.

WARNING

You must provide additional ventilation air in a confined space.

100750

FRESH AIR FOR COMBUSTION AND VENTILATION

Continued

VENTILATION AIR

Ventilation Air From Inside Building

This fresh air would come from an adjoining unconfined space. When ventilating to an adjoining unconfined space, you must provide two permanent openings: one within 12" of the ceiling and one within 12" of the floor 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).

WARNING

Rework worksheet, adding the space of the adjoining unconfined space. The combined spaces must have enough fresh air to supply all appliances in both spaces.

12"

	Ventilation Grills
Ventilation	Into Adjoining Room,
	Option 2
Grills	Or
into Adjoining	Remove
Room,	Door into
Option 1	Adjoining
	Room,
	Option 3

12"

Figure 2 - Ventilation Air from Inside Building

Continued

7

100750

FRESH AIR FOR COMBUSTION AND VENTILATION

Continued

8

VENTILATION AIR (Continued)

Ventilation Air From Outdoors

Provide extra fresh air by using ventilation grills or ducts. You must provide two permanent openings: one within 12" of the ceiling and one within 12" of the floor. 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 NFPA 54/ANSI Z223.1, 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.

Ventilated

Outlet Attic

Air

Outlet

Air

To Attic

To

Crawl

Space

Inlet

Air

		Inlet Air		Ventilated
				Crawl Space

Figure 3 - Ventilation Air from Outdoors

100750

INSTALLING	NOTICE
TO WALL
	A qualified service person must install heater. Follow all local codes.
	CHECK GAS TYPE
	Use only natural gas. If your gas supply is not natural, do not install heater. Call
	dealer where you bought heater for proper type heater.
	INSTALLATION ITEMS
	Before installing heater, make sure you have the items listed below.
	• piping (check local codes)	• ground joint union	• sediment trap
	• sealant (resistant to propane gas)	• test gauge connection *	• tee joint
	• manual shutoff valve *	(see Figure 13, page 15)	• pipe wrench

* An A.G.A. design certified manual shutoff valve with 1/8" NPT tap is an acceptable alternative to test gauge connection. Purchase the optional A.G.A. design certified manual shutoff valve from your dealer. See Accessories, page 31.

LOCATING HEATER

This heater is designed to be mounted on a wall.

WARNING

Maintain the minimum clearances shown in Figure 4 (page 10). If you can, provide greater clearances from floor, ceiling, and joining wall.

You can locate heater on floor, away from a wall. An optional floor mounting stand is needed. Purchase the floor mounting stand from your dealer. See Accessories, page 31.

WARNING

Never install the heater

•in a bedroom or bathroom

•in 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

CAUTION

If you install the heater in a home garage

•heater pilot and burner must be at least 18 inches above floor

•locate heater where moving vehicle will not hit it

CAUTION

WARNING ICON

G 001

This heater creates 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 impurities in the air (such as tobacco smoke) exist, may discolor walls.

IMPORTANT: Vent-free heaters add moisture to the air. Although this is beneficial, installing heater in rooms without enough ventilation air may cause mildew to form from too much moisture. See Fresh Air for Combustion and Ventilation, pages 5 through 8.

Continued 9

100750

Thermostat

Sensing Bulb

INSTALLING TO WALL

Continued

10

For convenience and efficiency, install heater

•where there is easy access for operation, inspection, and service

•in coldest part of room

An optional fan kit is available from your dealer. See Accessories, page 31. If planning to use fan, locate heater near an electrical outlet.

CEILING

	36"
8"	Minimum
Minimum
From
Sides Of
Heater
Left	Right
Side	Side

	3" Minimum To Top Surface
FLOOR	Of Carpeting, Tile Or Other
	Combustible Material

Figure 4 - Mounting Clearances As Viewed From Front of Heater

THERMOSTAT SENSING BULB

(Models VN1800IT and VN2550IT Only)

The thermostat sensing bulb has been placed inside the heater for protection during shipping.

Locating Thermostat Sensing Bulb

1.Remove front panel of heater (see Figure 7, page 11).

2.Locate thermostat sensing bulb just under the burner assembly.

IMPORTANT: Attach thermostat sensing bulb to the back of heater for proper operation.

Attaching Thermostat Sensing Bulb

1.Remove thermostat sensing bulb from holders inside heater. Route through slot opening in bottom of heater.

2.Place clamp on thermostat sensing bulb as shown in Figure 5. Clamp is provided in hardware package.

3.Snap clamp into upper mounting hole as shown in Figure 5. Mounting hole is located on lower left edge on back of heater. Make sure the thermostat sensing

bulb is pointing up.

Clamp

Figure 5 - Attaching Thermostat Sensing Bulb

100750

INSTALLING	INSTALLING HEATER TO WALL
TO WALL	Mounting Bracket
	The mounting bracket is located on back panel of heater. It has been taped there for
Continued	shipping. Remove mounting bracket from back panel.

Mounting

Bracket

Figure 6 - Mounting Bracket Location

Removing Front Panel Of Heater

1.Remove two screws near bottom corners of front panel.

2.Lift straight up on grill guard until it stops. Grill guard will slide up about 1/4".

3.Pull bottom of front panel forward, then down.

Figure 7 - Removing Front Panel Of Heater

Methods For Attaching Mounting Bracket To Wall

Only use last hole on each end of mounting bracket to attach bracket to wall. These two holes are 16 inches apart from their centers. Attach mounting bracket 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 through mounting bracket and into wall studs.

Attaching to wall anchor This method allows you to attach mounting bracket to hollow walls (wall areas between studs) or to solid walls (concrete or masonry).

Decide which method better suits your needs. Either method will provide a secure

hold for the mounting bracket.

Continued 11

100750

	INSTALLING	Marking Screw Locations
		1. Tape mounting bracket to wall where heater will be located. Make sure mounting
	TO WALL
		bracket is level.
	Continued
		WARNING
		Maintain minimum clearances shown in Figure 8. If you can, pro-
		vide greater clearances from floor and joining wall.

2.Mark screw locations on wall (see Figure 8).

Note: Only mark last hole on each end of mounting bracket. Insert mounting screws through these holes only.

3.Remove tape and mounting bracket from wall.

13"	16"	9 1/4"	16"
Min.		Min.

AdjoiningWall		AdjoiningWall	Only Insert Mounting
Only Insert Mounting	18 3/4"			18 3/4"
Screws Through Last	Min.		Screws Through Last	Min.
Hole On Each End			Hole On Each End
Floor			Floor
Models VN3000C and VN2550IT			Models VN1800C and VN1800IT

Figure 8 - Mounting Bracket Clearances

Attaching Mounting Bracket To Wall

Note: Wall anchors, mounting screws, and spacers are in hardware package. The hardware package is provided with heater.

Attaching to wall stud method

For attaching mounting bracket to wall studs

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

2.Place mounting bracket onto wall. Line up last hole on each end of bracket with holes drilled in wall.

3.Insert mounting screws through bracket and into wall studs.

4.Tighten screws until mounting bracket is firmly fastened to wall studs.

Attaching to wall anchor method

For attaching mounting bracket to hollow walls (wall areas between studs) or solid walls (concrete or masonry)

1.Drill holes at marked locations using 5/16" drill bit. For solid walls (concrete or masonry), drill at least 1" deep.

2.Fold wall anchor as shown in Figure 9.

Figure 9 - Folding Anchor

3. Insert wall anchor (wings first) into hole. Tap anchor flush to wall.

12

100750