Desa VMH3000TNA User Manual

®

VENT-FREE NATURAL GAS

MINI-HEARTH® HEATER

OWNER’S OPERATION AND INSTALLATION MANUAL

VMH3000TNA

15,000 to 30,000 Btu/Hr

with Thermostat

Shown with Optional

Mantel Which Features

a Built-In Base

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.

This appliance may be installed in an aftermarket*, permanently located, manufactured
(mobile) home, where not prohibited by local codes.

This appliance is only for use with the type of gas indicated on the rating plate. This appliance
is not convertible for use with other gases.

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

Save this manual for future reference.

WARNING: Improper installa­tion, adjustment, alteration,
service, or maintenance can
cause injury or property dam­age. Refer to this manual for
correct installation and op­erational procedures. For as­sistance or additional infor­mation consult a qualified in­staller, service agency, or the
gas supplier.

WARNING: This is an unvented
gas-fired heater. It uses air
(oxygen) from the room in
which it is installed. Provisions
for adequate combustion and
ventilation air must be pro­vided. Refer to

bustion and Ventilation

tion on page 5 of this manual.

Air For Com-

sec-

®

NATURAL GAS RESIDENTIAL HEATERS

SAFETY
INFORMATION

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, people 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.

WARNING: Any change to
this heater or its controls can be
dangerous.

WARNING: Do not allow fans
to blow directly into the heater.
Avoid any drafts that alter burner
flame patterns. Ceiling fans can
create drafts that alter burner
flame patterns. Altered burner
patterns can cause sooting.

WARNING: Do not use a
blower insert, heat exchanger
insert, or other accessory not
approved for use with this heater.

Due to high temperatures, the
appliance should be located out
of traffic and away from furniture
and draperies.

Do not place clothing or other
flammable 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 surfaces to avoid burns or
clothing ignition. Fireplace will
remain hot for a time after shut­down. Allow surfaces to cool be­fore touching.

Carefully supervise young chil­dren when they are in same room
with heater.

Make sure screen is in place be­fore running heater.

Keep the appliance area clear and
free from combustible materials,
gasoline, and other flammable
vapors and liquids.

1. This appliance is only for use with the
type of gas indicated on the rating plate.
This appliance is not convertible for use
with other gases.

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. 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, pages 5 through 7.

5. 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.

6. If heater shuts off, do not relight until
you provide fresh, outside air. If heater
keeps shutting off, have it serviced.

7. Do not run heater

• where flammable liquids or vapors

are used or stored.

• under dusty conditions.

8. 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.

9. To prevent the creation of soot, follow
the instructions in Cleaning and Main-
tenance, page 19.

10. Turn off and unplug heater and let cool
before servicing. Only a qualified service
person should service and repair heater.

11. Operating heater above elevations of
4,500 feet could cause pilot outage.

LOCAL CODES

Install and use heater with care. Follow all
local codes. In the absence of local codes, use
the latest edition of The National Fuel Gas
Code, ANS 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

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2

107097

PRODUCT
IDENTIFICATION

Ignitor Button

Heater
Cabinet

Log

Control Knob

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Front
Panel

OWNER’S MANUAL

Note:

Do not remove
Lighting and Warning
Plates from heater

Lighting and
Warning Plates

Screen

ASSEMBLY

ASSEMBLING HEATER

Tools Required:

• Phillips screwdriver

• 5/16" hex wrench

• slotted screwdriver

Removing Front Panel Of Heater

1. Remove two screws near bottom cor­ners of front panel with Phillips screw­driver.

2. Pull bottom of front panel forward, then
down (see Figure 2) .

Figure 1 - Vent-Free Gas Log Propane/LP Gas Space Heater

PRODUCT
FEATURES

SAFETY DEVICE

This heater has a pilot with an Oxygen
Depletion Sensing (ODS) safety shutoff

UNPACKING

CAUTION: Do not remove the
metal data plates attached to the
heater base assembly. The data
plates contain important warranty
information.

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.

PIEZO IGNITION SYSTEM

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

1. Remove heater from carton.

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

3. Make sure your heater includes two
hardware packets.

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

THERMOSTATIC HEAT
CONTROL

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

Figure 2 - Removing Front Panel of Heater

Installing Hood

1. Remove hood from protective tray.

2. Locate 4 black sheet metal screws in­side hardware pack.

3. Place hood on deflector and line up
holes (see Figure 3, page 4).

4. Secure hood to deflector with 4 black
sheet metal screws.

Note:

Side of hood should be on the outside

flange of deflector.

Installing Log

Note:

For easier installation, lay heater on

its back.

1. With Phillips screwdriver, remove two
screws holding screen in place. Remove
screen.

2. Remove log from inside of deflector.
Discard protective packaging.

3. Gently slide log between log retaining
brackets on deflector assembly (see Fig­ure 3, page 4). The log should fit firmly
against bottom of log retaining brackets.

4. Reattach screen using two screws re­moved in step 1.

107097

Continued

3

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®

NATURAL GAS RESIDENTIAL HEATERS

ASSEMBLY

Continued

Log

Front Panel

Truss­Head
Screw

Brass Front Trim

Figure 3 - Assembling Heater

Sheet Metal
Screw

Nut

Screw

Hood

Screen

Screw

Deflector

Burner Shield

Heater
Cabinet

Log
Retaining
Brackets

5. Slide other end of adjusting plate/shim
in slot on mitered edge of side brass
trim (see Figure 5).

6. While firmly holding edges of brass
trim together, tighten both set screws
on the adjusting plate with slotted
screwdriver.

7. Repeat steps 1 through 6 for other side.

8. Place the assembled trim on front of
heater cabinet. Attach on top and sides
with four brass screws included in hard­ware package (see Figure 6).

9. Reattach front panel to heater if you are
going to mount the heater to the base.
Do not reattach front panel at this time
if you are going to mount heater to wall.

Top Brass
Trim

Slot

Side Brass
Trim

Adjusting
Plate

Set
Screws

Shim

WARNING: Always have
burner shield and screen in place
before operating heater. This pre­vents excessive temperatures on
heater surfaces.
Failure to position the parts in
accordance with these diagrams
or failure to use only parts spe­cifically approved with this heater
may result in property damage or
personal injury.

Attaching Brass Front Trim to
Front Panel

1. Locate brass front trim in brass trim
package.

2. Slide the head of two truss-head screws
from hardware packet into each end of
brass front trim (see Figure 4).

3. Line up screws with holes in front panel
(see Figure 3). Insert screws in holes.
Attach nuts from inside of front panel.
Tighten with wrench.

Brass Front
Trim

Truss-Head
Screw

Figure 4 - Attaching Brass Front Trim to
Front Panel

Front Panel

Nut

Assembling and Attaching
Brass Trim

1. Remove packaging from remaining
three pieces of brass trim.

2. Locate four brass screws, two adjust­ing plates with set screws, and two
shims in the hardware packet.

3. Align shim under adjusting plate as
shown in Figure 4.

4. Slide one end of adjusting plate/shim
in slot on mitered edge of top brass trim
(see Figure 5).

Slot

Figure 5 - Assembling Brass Trim

Assembled
Brass Trim

Figure 6 - Attaching Brass Trim to Heater

Mitered Edge

Screws

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4

107097

OWNER’S MANUAL

AIR FOR
COMBUSTION AND
VENTILATION

WARNING: This heater shall
not be installed in a confined space
or unusually tight construction
unless provisions are provided
for adequate combustion 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 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 fuel­burning appliances.

PROVIDING ADEQUATE
VENTILATION

The following are excerpts from National
Fuel Gas Code, NFPA 54/ANS Z223.1, Sec­tion 5.3, Air for Combustion and Ventilation.

All spaces in homes fall into one of the three
following ventilation classifications:

1. Unusually Tight Construction

2. Unconfined Space

3. Confined 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 de­fined as construction where:

a. walls and ceilings exposed to the

outside atmosphere have a con­tinuous water vapor retarder with
a rating of one perm (6x10
per pa-sec-m2) or less with open­ings gasketed or sealed

b. weather stripping has been

added on openable windows and
doors

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 ad­ditional fresh air. See

From Outdoors

If your home does not meet all of the
three criteria above, proceed to

and

, page 7

Ventilation Air

.

mining Fresh-Air Flow For Heater Lo­cation

, page 6.

-11

and

Deter-

kg

Confined and Unconfined Space

The National Fuel Gas Code, ANS Z223.1
defines a confined space as a space whose
volume is less than 50 cubic feet per 1,000
Btu per hour (4.8 m3 per kw) of the aggre­gate input rating of all appliances installed
in that space and an unconfined space as a
space whose volume is not less than 50
cubic feet per 1,000 Btu per hour (4.8 m3 per
kw) of the aggregate input rating of all
appliances installed in that space. Rooms
communicating directly with the space in
which the appliances are installed*, through
openings not furnished with doors, are con­sidered a part of the unconfined space.

This heater shall not be installed in a con­fined space or unusually tight construction
unless provisions are provided for adequate
combustion and ventilation air.

* Adjoining rooms are communicating only
if there are doorless passageways or ventila­tion grills between them.

107097

Continued

5

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NATURAL GAS RESIDENTIAL HEATERS

AIR FOR
COMBUSTION AND
VENTILATION

Continued

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:

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:

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
* 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:

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 adjoin-

ing 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 7.
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.

Space size 20 ft. (length) x 16 ft. (width) x 8 ft. (ceiling height) = 2560 cu. ft. (volume of space)

2560 cu. ft. (volume of space) ÷ 50 cu. ft. = 51.2 or 51,200 (maximum Btu/Hr the space can support)

Example:

Gas water heater
Vent-free heater +
Total =

51,200 Btu/Hr (maximum the space can support)
60,000 Btu/Hr (actual amount of Btu/Hr used)

30,000
30,000
60,000

Btu/Hr
Btu/Hr
Btu/Hr

WARNING: If the area in which the heater may be operated is smaller than that defined as an unconfined space
or if the building is of unusually tight construction, provide adequate combustion and ventilation air by one of
the methods described in the

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National Fuel Gas Code, ANS Z223.1, Section 5.3

6

or applicable local codes.

107097

AIR FOR

OWNER’S MANUAL

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 7). You can also
remove door into adjoining room (see op­tion 3, Figure 7). Follow the National Fuel

Gas Code, NFPA 54/ANS Z223.1, Section

5.3, Air for Combustion and Ventilation for

required size of ventilation grills or ducts.

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.

Ventilation Grills

Ventilation

Grills

into Adjoining

Room,

Option 1

Figure 7 - Ventilation Air from Inside Building

Or

Remove
Door into
Adjoining

Room,

Option 3

Into Adjoining Room,

12"

12"

Option 2

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/ANS
Z223.1, Section 5.3, Air for Combustion and
Ventilation for required size of ventilation

grills or ducts.

IMPORTANT:

inlet or outlet air into attic if attic has a
thermostat-controlled power vent. Heated air
entering the attic will activate the power vent.

Do not provide openings for

Outlet
Air

Ventilated
Attic

Outlet
Air

Inlet
Air

Inlet Air

Figure 8 - Ventilation Air from Outdoors

To Attic

To

Crawl

Space

Ventilated

Crawl Space

107097

7

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®

NATURAL GAS RESIDENTIAL HEATERS

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 primary
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 qualified ser­vice person must install heater.
Follow all local codes.

CHECK GAS TYPE

Use only natural gas. If your gas supply is
not natural gas, 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)

• sealant (resistant to propane/LP gas)

• equipment shutoff valve *

• ground joint union

• test gauge connection *

• sediment trap

• tee joint

• pipe wrench
* A CSA design-certified equipment shutoff

valve with 1/8" NPT tap is an acceptable
alternative to test gauge connection. Pur­chase the optional CSA design-certified
equipment shutoff valve from your dealer.
See Accessories, page 23.

LOCATING HEATER

WARNING: Maintain the mini-

mum clearances shown in Figure

9. If you can, provide greater clear­ances from floor, ceiling, and join­ing wall.

You can locate heater on floor. The op­tional hearth base is needed. You can also
install optional decorative mantels on the
heater (some mantels require the hearth
base).

IMPORTANT:

mantels and hearth base specified in this
manual. Purchase the optional mantel and
hearth base from your dealer. See Accesso-
ries, page 23.

The heater may also be mounted on a wall.
You cannot use optional mantel if mounting
heater on a wall.

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 42 inches
from the front, top, or sides of
the heater

• as a fireplace insert

• in high traffic areas

• in windy or drafty areas

CEILING

6"
Minimum
From
Sides Of
Heater

Left
Side

FLOOR

Figure 9 - Mounting Clearances As Viewed
From Front of Heater

Only use optional

36"

Minimum

Right
Side

Minimum to
Top Surface
of Carpeting,

3"

Tile, or Other
Combustible
Material

CAUTION: 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 (such as to­bacco smoke, aromatic candles,
cleaning fluids, oil or kerosene
lamps, etc.) in the air 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 Air for Com-
bustion and Ventilation, pages 5 through 7.

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.

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 23. If plan­ning to use fan, locate heater near an electri­cal outlet.

For more information, visit www.desatech.com

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