Desa Tech CMH2800TNC, VMH2800TNC Owner's Manual

®

VENT-FREE NATURAL GAS

MINI HEARTH HEATER

OWNER’S OPERATION AND INSTALLATION MANUAL

®

Shown With Optional Mantel
Which Features a Built In Base

14,000 to 28,000 Btu/Hr with Thermostat “C” Models

VMH2800TNC

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* manufactured (mobile) home, where not
prohibited by state or local codes.

*Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer. (i.e. Installation of this
product is permitted after the manufactured (mobile) home is sited)

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.

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

Combustion and Ventilation

Air for

sec-

tion in this manual.

Save this manual for future reference.

®

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.

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. F ollow 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. 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 Air for Combustion
and Ventilation, pages 5 through 7.

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. Never place any objects on the heater.

9. Surface of heater becomes very hot
when running heater. K eep children and
adults away from hot surface to avoid
burns or clothing ignition. Heater will
remain hot for a time after shutdown.
Allow surface to cool before touching.

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

11. Make sure screen is in place before run­ning heater.

12. 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.

13. Turn of f and unplug heater and let cool
before servicing. Only a qualified ser­vice person should service and repair
heater.

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

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

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 ANSI Z223, 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

UNPACKING

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.

PRODUCT
FEATURES

Safety Device

This heater has a pilot with an Oxygen
Depletion Sensor Shutoff System (ODS).
The ODS/pilot is a required feature for vent­free 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

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.

2

103506

PRODUCT

OWNER’S MANUAL

IDENTIFICATION

Ignitor Button

Heater
Cabinet

Log

Figure 1 - Vent-Free Gas Log Natural Gas Space Heater

Control Knob

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Lighting and
Warning
Plates

Screen

Front
Panel

ASSEMBLY

ASSEMBLING HEATER

Tools Required: Phillips screwdriver, 5/16"
hex wrench, and 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 2 - Removing Front Panel of Heater

Installing Log

Note:

For easier installation, lay heater on

its back.

1. Remove log from inside top of heater.
Discard protective packaging.

2. Attach ignitor cable to piezo ignitor
(see Figure 3).

Piezo Ignitor

Ignitor
Cable

Figure 3 - Attaching Ignitor Cable to Piezo
Ignitor

3. With Phillips scre wdriver , remove four
screws holding screen in place. Remove
screen.

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

5. Reattach screen using four screws re­moved in step 3.

103506

3

®

GAS RESIDENTIAL HEATERS

ASSEMBLY

Continued

Front Panel

Screen

Truss­Head
Screw

Nut

Brass
Front
Trim

Figure 4 - Assembling Heater

Log

Screw

Heater Cabinet

Screw

Burner Shield

Deflector

Log
Retaining
Brackets

5. Slide other end of adjusting plate/shim
in slot on mitered edge of side brass
trim (see Figure 6).

Adjusting

Side Brass
Trim

Slot

Figure 6 - Assembling Brass Trim

Plate

Set
Screws

Shim

Mitered Edge

Top Brass
Trim

Slot

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 7).

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 5).

3. Line up screws with holes in front panel
(see Figure 4). Insert screws in holes.
Attach nuts from inside of front panel.
Tighten with wrench.

Brass Front
Trim

Truss-Head
Screw

Figure 5 - 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 6.

4. Slide one end of adjusting plate/shim
in slot on mitered edge of top brass trim
(see Figure 6).

4

Screws

Assembled
Brass Trim

Figure 7 - Attaching Brass Trim to Heater

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.

103506

OWNER’S MANUAL

AIR FOR
COMBUSTION AND
VENTILATION

WARNING: This heater shall

not be installed in a confined
space 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 is exerpts from National Fuel
Gas Code. NFPA 54/ANSI 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
sec-m2) or less with openings
gasketed or sealed

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 wall­ceiling 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 Ventilation Air From Outdoors,
page 7.

If your home does not meet all of the three
criteria above, proceed to page 6.

and

-11

per pa-

Confined and Unconfined Space

The National Fuel Gas Code (ANSIZ223.1,
1992 Section 5.3) 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.

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

103506

5

®

GAS RESIDENTIAL HEATERS

AIR FOR
COMBUSTION AND
VENTILATION

Continued

DETERMINING 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.

Example:

* 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 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 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)

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

Gas water heater 30,000 Btu/Hr
Vent-free heater + 28,000 Btu/Hr
Total = 58,000 Btu/Hr

51,200 Btu/Hr (maximum the space can support)
58,000 Btu/Hr (actual amount of Btu/Hr used)

6

103506

AIR FOR
COMBUSTION AND
VENTILATION

Continued

WARNING: If the area in which

the heater may be operated is
smaller than that defined as an
unconfined space, provide ad­equate combustion and ventila­tion air by one of the methods
described in the

Gas Code, ANSI Z223.1, 1992,
Section 5.3

codes

.

VENTILATION AIR

National Fuel

or applicable local

Ventilation

Grills

into Adjoining

Room,

Option 1

Or

Remove
Door into
Adjoining

Room,

Option 3

OWNER’S MANUAL

12"

Ventilation Grills

Into Adjoining Room,

Option 2

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 8). You can also
remove door into adjoining room (see op­tion 3, Figure 8). 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.

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 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.

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

12"

Figure 8 - Ventilation Air from Inside Building

Outlet
Air

Ventilated
Attic

Outlet
Air

Inlet
Air

Inlet Air

Figure 9 - Ventilation Air from Outdoors

To Attic

To

Crawl

Space

Ventilated

Crawl Space

103506

7

®

GAS RESIDENTIAL HEATERS

INSTALLATION

NOTICE: 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)

• manual shutoff valve *

• ground joint union

• test gauge connection * (see Figure
20, page 12)

• sediment trap

• tee joint

• 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 20.

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: 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.

CEILING

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

LOCATING HEATER

WARNING: Maintain the mini-

mum clearances shown in Figure

10. 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).

PORTANT:

Only use optional mantels and
hearth base specified in this manual. Pur­chase the optional mantel and hearth base
from your dealer. See Accessories, pages 20
and 21.

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

IM-

36"

6"

Minimum
From
Sides Of
Heater

Left
Side

FLOOR

Figure 10 - Mounting Clearances As Viewed From Front of Heater

8

Minimum

Right
Side

5"

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

103506