Desa VyS18PC Quick start guide
For more information, visit www.desatech.com
WARNING: If the information in this manual is not
— WHAT TO DO IF YOU SMELL GAS
-
UNVENTED (VENT-FREE) GAS LOG HEATER
OWNER’S OPERATION AND INSTALLATION MANUAL
18" AND 24" VARIAbLE MANUALLy-CONTROLLED
MODELS VyS18NC, VyS18PC, VyS24NC AND VyS24PC
PFS
®
US
www.desatech.com 124452-01A2
SAFETy
alteration,serviceormain-
to this manual for correct
-
-
tance or additional infor-
-
masonry or UL127 fac-
-
in accordance with ANSI
includes instructions stat-
WARNING: This is an
-
from the room in which
and ventilation air must
Refer to Air
for Combustion and Ven-
tilation
-
stalled in an aftermarket,*
-
TAbLE OF CONTENTS
Safety .................................................................. 2
Product Identication........................................... 4
Local Codes......................................................... 5
Unpacking............................................................ 5
Product Features................................................. 5
Air For Combustion and Ventilation ..................... 5
Installation ........................................................... 8
Operation .......................................................... 17
Inspecting Burners............................................. 19
Cleaning and Maintenance................................ 19
Troubleshooting................................................. 21
Specications .................................................... 25
Technical Service............................................... 25
Service Hints ..................................................... 25
Replacement Parts............................................ 25
Parts .................................................................. 26
Accessories ....................................................... 28
Parts Central...................................................... 28
Warranty ..............................................Back Cover
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124452-01A 3
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known to the State of California
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Early signs
of carbon monoxide poisoning resemble the
u, with headaches, dizziness or nausea. If
you have these signs, the replace may not
be working properly.
Have replace serviced. Some people are
more affected by carbon monoxide than oth-
ers. These include pregnant women, people
with heart or lung disease or anemia, those
under the inuence of alcohol and those at
high altitudes.
Natural and
propane/LP gases are odorless. An odor-mak-
ing 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
warnings. Keep this manual for reference. It
is your guide to safe and proper operation of
this replace.
this heater or its controls can
WARNING: Do not use a
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SAFETy
Continued
WARNING: Do not allow fans
will remain hot for a time after
-
dren when they are in the room
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-
1. This appliance is only for use with type of
gas indicated on rating plate. This appli-
ance is not convertible for use with other
gases.
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SAFETy
Continued
Figure 1 - Product Idetication
11. 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.
12. This heater needs fresh, outside air ven-
tilation 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. If heater keeps shutting off, see
Troubleshooting,page 20.
13. Do not run heater
• where ammable liquids or vapors are
used or stored
• under dusty conditions
14. Do not use this heater to cook food or burn
paper or other objects.
15. Do not use heater if any part has been ex-
posed to or under water. Immediately call
a qualied 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.
16. Do not operate heater if any log is broken.
Do not operate heater if a log is chipped
(dime-sized or larger).
17. Turn heater off and let cool before servic-
ing. Only a qualied service person should
service and repair heater.
18. Operating heater above elevations of
4,500 feet could cause pilot outage.
19. Provide adequate clearances around air
openings.
PRODUCT
IDENTIFICATION
2. Do not place propane/LP supply tank(s)
inside any structure. Locate propane/LP
supply tank(s) outdoors (propane/LP
units only).
3. To prevent performance problems, the
use of a propane/LP tank of less than
100 lbs. capacity is not recommended
(propane/LP units only).
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
5. This heater shall not be installed in a
bedroom or bathroom unless installed as
a vented appliance (see Installing Damper
Clamp Accessory for Vented Operation,
page 11). This gas log set may not be
installed as a vented appliance in a bed-
room or bathroom in the Commonwealth
of Massachusetts.
6. Do not burn solid-fuel in a masonry or
UL127 factory-built replace in which a
vent-free room heater is installed.
7. Before installing in a solid fuel burning re-
place, the chimney ue and rebox must
be cleaned of soot, creosote, ashes and
loose paint by a qualied chimney cleaner.
Creosote will ignite if highly heated. A dirty
chimney ue may create and distribute
soot within the house. Inspect chimney
ue and rebox for damage. If damaged,
repair ue before operating heater.
8.
If replace has glass doors, never operate
this heater with glass doors closed. If you
operate heater with doors closed, heat
buildup inside replace will cause glass to
burst. Make sure there are no obstructions
across openings of replace.
9. This log heater is designed to be smoke-
less. If logs ever appear to smoke, turn off
heater and call a qualied service person.
Note: During initial operation, slight smok-
ing could occur due to log curing and
heater burning manufacturing residues.
10. To prevent the creation of soot, follow
the instructions in Cleaning and Mainte-
nance, page 18.
Heater Base
Control Knob
Grate
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124452-01A 5
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/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
Note: Where listed vented decorative logs are
required, thermostat models are not permitted.
PRODUCT FEATURES
AIR FOR COMbUSTION AND VENTILATION
UNPACkING
LOCAL CODES
CAUTION: Do not remove the
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1. Remove log and heater base assembly
from carton.
Note: Do not pick up heater base assem-
bly by burners. This could damage heater.
Always handle base assembly by grate.
2. Remove all protective packaging applied
to log and heater for shipment.
3. Check heater for any shipping damage. If
heater is damaged call DESA Heating, LLC
at 1-866-672-6040 for replacement parts
before returning to dealer.
This heater is clean burning. It requires no
outside venting. There is no heat loss out a
vent or up a chimney. Heat is generated by
realistic, dancing yellow ames. This heater
is designed for vent-free operation with ue
damper closed. It has been tested and
approved to ANSI Z21.11.2 standard for
unvented heaters. State and local codes
in some areas prohibit the use of vent-free
heaters. Non-thermostat models may also
be operated as a vented decorative (ANSI
Z21.60) product by opening ue damper.
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.
WARNING: This heater shall
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National Fuel Gas Code, ANSI
Z223.1/NFPA 54, the International
Fuel Gas Code,-
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Today’s homes are built more energy efcient
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. Dur-
ing heating months, home owners want their
homes as airtight as possible.
While it is good to make your home energy
efcient, your home needs to breathe. Fresh
air must enter your home. All fuel-burning ap-
pliances need fresh air for proper combustion
and ventilation.
State of Massachusetts: The installa-
tion must be made by a licensed plumber
or gas fitter 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
Commonwealth of Massachusetts.
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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 appli-
ances.
The following are excerpts from National Fuel
Gas Code. ANSI Z223.1/NFPA 54, Air for
Combustion and Ventilation.
All spaces in homes fall into one of the three
following ventilation classications:
1. Unusually Tight Construction
2. Unconned Space
3. Conned Space
The information on pages 5 through 7 will
help you classify your space and provide
adequate ventilation.
The air that leaks around doors and windows
may provide enough fresh air for combustion
and ventilation. However, in buildings of un-
usually tight construction, you must provide
additional fresh air.
construction where:
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-112
and
and
If your home meets all of the three criteria
See Ventilation Air From Outdoors
If your home does not meet all of the three
Determining
Fresh-Air Flow For Heater Location
C
The National Fuel Gas Code ANSI Z223.1/
NFPA 54 denes a conned space as a space
whose volume is less than 50 cubic feet per
AIR FOR COMbUSTION AND VENTILATION
Continued
1,000 Btu per hour (4.8 m3 per kw) of the ag-
gregate input rating of all appliances installed
in that space and an unconned 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 un-
conned space.
* Adjoining rooms are communicating only if
there are doorless passageways or ventilation
grills between them.
DETERMINING FRESH-AIR FLOW
Use this work sheet to determine if you have
a conned or unconned space.
Includes the room in which you will install
replace plus any adjoining rooms with door-
less 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) = 2,560 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: 2,560 cu. ft. (volume of space) 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 replace _________ 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.
Direct-vent draws combustion air from the
outdoors and vents to the outdoors.
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124452-01A 7
Example:
Gas water heater _________ Btu/Hr
Vent-free replace + _________ 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)
71,500 Btu/Hr (actual amount of
Btu/Hr used)
The space in the example is a conned 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
unconned 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 replace, if lower Btu/Hr
size makes room unconned.
If the actual Btu/Hr used is less than the maxi-
mum Btu/Hr the space can support, the space is
an unconned space. You will need no additional
fresh air ventilation.
WARNING:Ifthearea inwhich
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National Fuel
Gas Code,ANSI Z223.1/NFPA 54,
the International Fuel Gas Code,
This fresh air would come from an adjoining
unconned space. When ventilating to an
adjoining unconned space, you must provide
two permanent openings: one within 12" of the
40,000
31,500
71,500
AIR FOR COMbUSTION AND VENTILATION
Continued
Figure 2 - Ventilation Air from Inside
Building
Or
Remove
Door into
Adjoining
Room,
Option
3
Ve ntilation Grills
Into Adjoining Room,
Option 2
Ve ntilation
Grills Into
Adjoining
Room,
Option 1
12"
12"
Figure 3 - Ventilation Air from Outdoors
Outlet
Air
V e ntilated
Attic
Outlet
A
ir
Inlet
Air
Inlet Air V e ntilated
Crawl Space
T o
Crawl
Space
T o Attic
ceiling and one within 12" 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, Air for Combustion and
Ventilation for required size of ventilation
grills or ducts.
Provide extra fresh air by using ventilation
grills or ducts. You must provide two perma-
nent openings: one within 12" of the ceiling
and one within 12" 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, 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 thermo-
stat-controlled power vent. Heated air entering
the attic will activate the power vent.
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NOTICE: This heater is intended
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NOTICE:State orlocal codesmay
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WARNING: Seal any fresh
air vents or ash clean-out doors
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INSTALLATION
WARNING: Never install the
heater
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where curtains, furniture, cloth-
CAUTION: This heater creates
move heat to wall surfaces next
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IMPORTANT:Vent-free heaters add moisture
to the air. Although this is benecial, installing
heater in rooms without enough ventilation
air may cause mildew to form from too much
moisture. See Air for Combustion and Ventila-
tion, page 5.
Use only the correct gas type (natural or
propane/LP) for your unit. If your gas sup-
ply is not correct, do not install heater. Call
dealer where you bought heater for proper
type heater.
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124452-01A 9
INSTALLATION AND CLEARANCES
WARNING: Maintain the
Side Wall 16", Ceiling 42", Front 36"
Height 17", Depth 14", Front Width 24",
Rear Width 20" (measured at 14" depth).
Carefully follow instructions below. This
will ensure safe installation into a masonry,
UL127-listed manufactured replace or certi-
ed vent-free rebox.
Minimum Clearances For Side
A. Clearances from side of replace cabinet
to any combustible material and wall
should follow diagram in Figure 4.
Example: The face of a mantel, bookshelf,
etc. is made of combustible material and
protrudes 3 1/2" from the wall. This com-
bustible material must be 4" from the side
of the replace cabinet (see Figure 4).
Note: When installing your gas logs into
a manufactured rebox, follow rebox
manufacturer’s instructions for minimum
clearances to combustible materials.
B. Clearances from the top of the replace
opening to the ceiling should not be less
than 42".
Figure 4 - Minimum Clearance for
Combustible to Wall
*Minimum 16" from Side Wall
*
Example
INSTALLATION
Continued
NOTICE: Manual control heaters
If so, you must always run heater
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InstallingDamperClamp Accessory
for Vented Operation
Clearances
Note: If using a mantel, proceed to If Using
Mantel, page 10. If not using a mantel, follow
the information below.
You must have noncombustible material(s)
above the replace opening. Noncombustible
materials (such as slate, marble, tile, etc.) must
be at least 1/2" thick. With sheet metal, you
must have noncombustible material behind it.
Noncombustible material must extend at least 8"
up. See Figure 5 for minimum clearances.
12" or more Noncombustible material okay.
Between 8" and 12"
Noncombustible material okay.
Less than 8" Noncombustible material must
be extended to at least 8".
See Between 8" and 12",
above. If you cannot extend
material, you must operate
heater with ue damper open.
Heat Resistant
Material
(A)
Figure 5 - Heat Resistant Material (Slate,
Marble, Tile, etc.) Above Fireplace
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Minimum
Noncombustible
Material
Minimum
Noncombustible
Material Height
Distances to
Underside of
Mantel
Top of
Fireplace
Opening
Underside of
Mantel Shelf
Mantel Shelf
8"
(A)
8" 14" 17" 20"
All minimum
distances are
in inches
Log Set
All Models
2 1/2"
6"
8"
10"
IMPORTANT: If you cannot meet these mini-
mum clearances, you must operate heater
with chimney ue damper open. Go to Install-
ing Damper Clamp Accessory for Vented
Operation, page 11.
You must have noncombustible material(s)
above the replace opening. Noncombustible
materials (such as slate, marble, tile, etc.) must
be at least 1/2" thick. With sheet metal, you
must have noncombustible material behind it.
Noncombustible material must extend at least
8" up. See Figure 5, page 9, and Figure 6 for
minimum clearances.
IMPORTANT: If you cannot meet these mini-
mum clearances, you must operate heater
with chimney ue damper open. Go to Install-
ing Damper Clamp Accessory for Vented
Operation, page 11.
INSTALLATION
Continued
MANTEL CLEARANCES
In addition to meeting noncombustible mate-
rial clearances, you must also meet required
clearances between replace opening and
mantel shelf. If you do not meet the clearances
listed below, you will need a hood.
You must meet the minimum clearances
between the mantel shelf and the top of the
replace opening as shown in Figure 6.
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Follow all minimum clearances
NOTICE: If your installation does
not meet the minimum clear-
ances shown, you must do one
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Figure 6 - Minimum Mantel Clearances
Without Using Hood
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124452-01A 11
INSTALLATION
Continued
14"
Min.
Combustible
Material
Noncombustible Material
Hearth
5"
Min.
Combustible
Material
Figure 8 - Minimum Fireplace Clearances
Above Combustible Flooring
Figure 7 - Minimum Fireplace Clearances
If Installed at Floor Level
FLOOR CLEARANCES
A. If installing appliance on oor level, you
must maintain the minimum distance of
14" to combustibles (see Figure 7).
B. If combustible materials are less than 14"
to replace, you must install appliance at
least 5" above combustible ooring (see
Figure 8).
Diameter Area
5" 20 sq. inches
6" 29 sq. inches
7" 39 sq. inches
8" 51 sq. inches
Chimney
6' to 15' 39 sq. inches
15' to 30' 29 sq. inches
Note: When used as a vented heater, ap-
pliance must be installed only in a solid-fuel
burning fireplace with a working flue and
constructed of noncombustible material.
You may use this heater as a vented product.
There are three reasons for operating your
heater in the vented mode.
1. The replace does not meet the clear-
ance to combustibles requirements for
vent-free operation.
2. State or local codes do not permit vent-
free operation.
3. You prefer vented operation.
If reasons number 1 or 2 apply to you, you
must permanently open chimney ue damper.
You must install the damper clamp accessory
(to order, see Accessories, page 28). This
will insure vented operation (see Figure 9).
The damper clamp will keep damper open.
Installation instructions are included with
clamp accessory.
See chart below for minimum permanent ue
opening you must provide. Attach damper
clamp so the minimum permanent ue open-
ing will be maintained at all times.
Figure 9 - Attaching Damper Clamp
Manufactured
Damper
Damper
Clamp
Damper
Damper
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INSTALLATION
Continued
CAUTION: Do not remove the
WARNING: You must secure
not, heater will move when you
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IMPORTANT: Make sure heater burners are
level. If heater is not level, heater will not
work properly.
Installation Items Needed
• hardware package (provided with heater)
• approved exible gas hose (not provided)
(if allowed by local codes)
•
sealant (resistant to propane/LP gas, not
provided)
• electric drill with 3/16" drill bit
• athead screwdriver
1. Apply pipe joint sealant lightly to male
threads of the tting to be threaded into
gas regulator. Connect approved exible
gas hose to gas regulator of heater (see
Figure 10).
IMPORTANT: Hold gas regulator with
wrench when connecting exible gas hose.
2. Locate masonry screws in hardware
package.
3. Position heater base assembly in replace.
4. Place log in proper position on heater base
(see Installing Logs, page 15).
5. Center heater base and logs front-to-front
and side-to-side in replace.
6. Carefully remove log without moving
heater base.
7. Mark screw locations through holes in
mounting brackets (see Figure 11). If
installing in a brick-bottom replace, mark
screw locations in mortar joint of bricks.
8. Remove heater base from replace.
9. Drill holes at marked locations using 3/16"
drill bit.
10. Attach base assembly to replace oor
using two masonry screws (in hardware
package) (see Figure 11).
Figure 11 - Attaching Base Assembly to
Fireplace Floor
Heater Gas
Regulator
Flexible Gas Hose
(if allowed by local codes)
Figure 10 - Attaching Flexible Gas Hose
to Heater Gas Regulator
Fitting
Masonry
Screw
Mounting
Bracket
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124452-01A 13
INSTALLATION
Continued
CAUTION: Never connect
-
units, never connect heater to
Installation Items Needed
Before installing heater, make sure you have
the items listed below.
• external regulator (supplied by installer)
• piping (check local codes)
• sealant (resistant to propane/LP gas)
• equipment shutoff valve *
• test gauge connection *
• sediment trap
• tee joint
• pipe wrench
* A CSA design-certied equipment shutoff
valve with 1/8" NPT tap is an acceptable al-
ternative to test gauge connection. Purchase
the optional CSA design-certied equipment
shutoff valve from your dealer.
For propane/LP gas, the installer must supply
an external regulator. An 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 external regulator with vent point-
ing down as shown in Figure 12. Pointing vent
down protects it from freezing rain or sleet.
Installation must include an 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 13 page 14).
IMPORTANT: Install equipment shutoff valve
in an accessible location. Main gas valve is
for turning on or shutting off gas to the ap-
pliance.
Check your building codes for any special
requirements for locating equipment shutoff
valve to replaces.
Apply pipe joint sealant lightly to male NPT
threads. This will prevent excess sealant from
going into pipe. Excess sealant in pipe could
result in clogged heater valves.
Figure 12 - External Regulator With Vent
Pointing Down
Propane/LP
Supply Tank
External
Regulator
with Vent
Pointing
Down
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INSTALLATION
Continued
Figure 13 - Gas Connection
* Purchase the optional CSA design-certied
equipment shutoff valve from your dealer.
** Min. inlet pressure for purpose of input
adjustment.
Tee Cap Pipe
Joint Nipple
3" Min.
Sediment Trap
Gas
Regulator
CSA Design-Certied
Equipment Shutoff Valve
With 1/8" NPT Tap*
Approved
Flexible
Gas Hose (if
allowed by
local codes)
Natural
From Gas Meter
(5" W.C.** to
10.5" W.C.
Pressure)
From External
Regulator
(11" W.C.**
to 14" W.C.
Pressure
CHECKING GAS CONNECTIONS
and connections, internal and
external to unit, for leaks after
WARNING: Never use an
-
-
Connecting
to Gas Supply
1. Disconnect appliance with its appliance
main gas valve (control valve) and equip-
ment shutoff valve from gas supply piping.
Pressures in excess of 1/2 psig will dam-
age heater regulator.
2. Cap off open end of gas pipe where equip-
ment shutoff valve was connected.
3. Pressurize supply piping system by either
opening propane/LP supply tank valve
for propane/LP gas or opening main gas
valve located on or near gas meter for
natural gas or using compressed air.
4. Check all joints of gas supply piping system.
Apply a commercial leak detection solution
to all joints. Bubbles forming show a leak.
5. Correct all leaks at once.
6. Reconnect heater and equipment shutoff
valve to gas supply. Check reconnected
ttings for leaks.
1. Close equipment shutoff valve (see Fig-
ure 14).
2. Pressurize supply piping system by either
opening propane/LP supply tank valve
for propane/LP gas or opening main gas
valve located on or near gas meter for
natural gas or using compressed air.
Figure 14 - Equipment Shutoff Valve
Open
Closed
Equipment
Shutoff Valve
We recommend that you install sediment
trap in supply line as shown in Figure 13.
Locate sediment trap where it is within reach
for cleaning. Install in piping system between
fuel supply and heater. Locate sediment trap
where trapped matter is not likely to freeze.
A sediment trap traps moisture and contami-
nants. This keeps them from going into heater
controls. If sediment trap is not installed or is
installed wrong, heater may not run properly.
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124452-01A 15
INSTALLATION
Continued
Equipment Shutoff Valve
Propane/LP
Supply Tank
Control Valve
Location
Figure 16 - Checking Gas Joints
(Natural Gas Only)
Gas
Meter
Equipment Shutoff Valve
Control Valve Location
Figure 15 - Checking Gas Joints
(Propane/LP Gas Only)
3. Check all joints from gas meter (natural
gas) or propane/LP supply to equipment
shutoff valve (see Figure 15 or 16). Apply
a commercial leak detection solution to all
joints. Bubbles forming show a leak.
4. Correct all leaks at once.
INSTALLING LOGS
CAUTION: After installa-
-
It is very important to install these logs exactly
as instructed. Do not modify logs. Only use
logs supplied with heater.
1. Place grate into square holes on heater
base as shown in Figure 17.
2. Place front log on burner so that it sits
between grate ngers and burner (see
Figure 17).
Figure 17 - Installing Grate and Logs
CONNECTIONS
1. Open equipment shutoff valve (see Figure
14, page 14).
2. Open main gas valve located on or near
gas meter for natural gas or open pro-
pane/LP supply tank valve.
3. Make sure control knob of heater is in the
OFF position.
4. Check all joints from gas meter (natural
gas) or propane/LP supply to equipment
shutoff valve (see Figure 15 or 16). Apply
a commercial leak detection solution to all
joints. Bubbles forming show a leak.
5. Correct all leaks at once.
6. Light heater (see Operation page 16).
Check all other internal joints for leaks.
7. Turn off heater (see To Turn Off Gas to
Appliance, page 17).
Grate
Heater Base
Front Log
The Front Log Should Be
Centered Left To Right.
www.desatech.com 124452-01A16
INSTALLATION
Continued
3. Place rear log on heater base behind the
metal burner. The bottom of the rear log
has recess areas on the left and right side
for the base to set into. Pull the rear log
forward until it touches the front log (see
Figure 17, page 15).
4. Place the left crossover log as shown
in Figure 18. The bottom of the log is
marked with a “L” for left. Match round
peg on left side of top of rear log with
round hole in bottom of left crossover.
Match square peg on left side of top of
front log with square hole in bottom of left
crossover log.
5. Place the center crossover log as shown in
Figure 19. The bottom of the log is marked
with a “C” for center. Match square peg
on center of rear log with square hole in
bottom of center crossover. Match round
peg on center of front log with round hole
in bottom of center crossover log.
6. Place the right crossover log as shown in
Figure 20. The bottom of the log is marked
with a “R” for right. Match square peg on
right side of rear log with square hole in
bottom of right crossover. Match round
peg on right side of front log with round
hole in bottom of right crossover log.
7. Add lava rock around base of heater if
desired. Do not place any lava rock on
logs or burner.
Left Crossover
Log
Figure 18 - Installing Left Crossover Log
Figure 19 - Installing Center Crossover
Log (VYS18 Series Shown)
Center
Crossover
Log
Figure 20 - Installing Left Crossover Log
Right
Crossover
Log
www.desatech.com
124452-01A 17
OPERATION
LIGHTING
INSTRUCTIONS
WARNING:
-
erate heater with doors closed,
-
-
Note: Home owners generally prefer to oper-
ate their heater with the chimney damper
closed. This will put all the heat into the room.
However, there may be times you will desire
the full ames of the HI heat setting but will
nd the heat output excessive. You can open
the chimney damper (if you have one) fully or
partially to release some of the heat.
FOR YOUR SAFETY
WARNING: If you do not fol-
low these instructions exactly,
-
WHAT TO DO IF YOU SMELL GAS
-
www.desatech.com 124452-01A18
PILOT
OFF
LO
HI
1. STOP! Read the safety information in
column 1.
2. Make sure equipment shutoff valve is fully
open.
3. Press in and turn control knob clockwise
to the OFF position.
4. Wait ve (5) minutes to clear out any gas.
Then smell for gas, including near the
oor. If you smell gas, STOP! Follow “B”
in the safety information, page 17. If you
don’t smell gas, go to the next step.
5. Press in control knob and turn counterclock-
wise to the PILOT position. The
ignitor will spark once. Keep control knob
pressed in for 5 seconds. If control knob does
not pop up when released, contact a qualied
service person or gas supplier for repairs.
Note: You may be running this heater for
the rst time after hooking up to gas sup-
ply. If so, the control knob may need to be
pressed in for 30 seconds or more. This will
allow air to bleed from the gas system.
6. Turn control knob clockwise to
OFF position. Press in control knob and
turn counterclockwise to PILOT
position. This will light pilot. Pilot is at-
tached to rear of burner. If needed, repeat
this process until pilot lights.
Note: If pilot does not stay lit, contact a
qualied service person or gas supplier
for repairs. Until repairs are made, light
pilot with match. To light pilot with match,
see Manual Lighting Procedure.
7. Keep control knob pressed in for 30 sec-
onds after lighting pilot. After 30 seconds,
release control knob.
Note: If pilot goes out, repeat steps 3
through 7.
• If control knob does not pop out when
released, contact a qualified service
person or gas supplier for repairs.
8. Slightly press and turn control knob coun-
terclockwise to desired heating
level. The burner should light. Set control
knob to HI or LO.
Figure 21 - Control Knob and Ignitor
Button Location
Control Knob
Figure 22 - Pilot
The variable control valve can be set to high
or low, by simply turning the control knob
until that setting is attained. Even the low-
est setting provides realistic, dancing yellow
ames. Selecting higher settings produces
greater heat output. This results in increased
heating comfort.
CAUTION: Do not try to ad-
TO TURN OFF GAS
1. Press in and turn control knob clockwise
to the OFF position.
2. Close equipment shutoff valve (see Figure
14, page 14).
MANUAL LIGHTING
1. Follow steps 1 through 5 under Lighting
Instructions, page 17.
2. Depress control knob and light pilot
with match.
3. Keep control knob pressed in for 30 sec-
onds after lighting pilot. After 30 seconds,
release control knob. Now follow step 8
under Lighting Instructions, page 17.
OPERATION
Continued
Ignitor Electrode
Pilot Burner
Thermocouple
9. To leave pilot lit and shut off burners only,
turn control knob clockwise to the
PILOT position.
www.desatech.com
124452-01A 19
INSPECTING bURNERS
Figure 23 - Correct Pilot Flame Pattern
Figure 21 - Incorrect Pilot Flame Pattern4
Air is drawn into the burner through the holes
in the tting at the entrance to the burner.
These holes may become blocked with dust
or lint. Periodically inspect these holes for any
blockage and clean as necessary. Blocked air
holes will create soot.
Periodically inspect all burner ame holes with
the heater running. All slotted burner ame
holes should be open with yellow ame pres-
ent. All round burner ame holes should be
open with a small blue ame present. Some
burner ame holes may become blocked by de-
bris or rust, with no ame present. If so, turn off
heater and let cool. Remove blockage, blocked
burner ame holes will create soot.
Check pilot ame pattern and burner ame
patterns often.
Figure 23 shows a correct pilot ame pattern.
Figure 24 shows an incorrect pilot ame pat-
tern. The incorrect pilot ame is not touching the
thermocouple. This will cause the thermocouple
to cool. When the thermocouple cools, the
heater will shut down.
If pilot ame pattern is incorrect, as shown
in Figure 24
• turn heater off (see To Turn Off Gas to Ap-
pliance, page 18)
• see Troubleshooting, page 21
Note: The pilot ame on natural gas units will
have a slight curve, but ame should be blue
and have no yellow or orange color.
Pilot Burner
Thermocouple
Pilot Burner
Thermocouple
CLEANING AND MAINTENANCE
WARNING: Turn off heater
-
-
Use a vacuum cleaner or small, soft bristled
brush to clean.
The primary air inlet holes allow the proper
amount of air to mix with the gas. This pro-
vides a clean burning ame. Keep these holes
clear of dust, dirt and lint. Clean these air inlet
holes prior to each heating season. Blocked
air holes will create soot. We recommend that
you clean the unit every three months during
operation and have heater inspected yearly
by a qualied service person.
www.desatech.com 124452-01A20
We also recommend that you keep the burner
tube and pilot assembly clean and free of dust
and dirt. To clean these parts we recommend
using compressed air no greater than 30 PSI.
Your local computer store, hardware store or
home center may carry compressed air in a
can. If using compressed air in a can, please
follow the directions on the can. If you don’t
follow directions on the can, you could dam-
age the pilot assembly.
1. Shut off unit, including pilot. Allow unit to
cool for at least thirty minutes.
2. Inspect burner, pilot and primary air inlet
holes on injector holder for dust and dirt
(see Figure 25).
3. Blow air through the ports/slots and holes
in the burner.
4. Check injector holder located at the end of
the burner tube again. Remove any large
particles of dust, dirt, lint or pet hair with
a soft cloth or vacuum cleaner nozzle.
Figure 25 - Injector Holder On Outlet
Burner Tube
Burner Tube
Primary Air
Inlet Holes
Injector Holder (May
Be Brass or Aluminum
Depending on Model)
Figure 26 - Pilot Inlet Air Hole
CLEANING AND MAINTENANCE
Continued
Pilot
Assembly
Pilot Air
Inlet Hole
5. Blow air into the primary air holes on the
injector holder.
6. In case any large clumps of dust have now
been pushed into the burner repeat steps
3 and 4.
Clean pilot assembly also. A yellow tip on the
pilot ame indicates dust and dirt in the pilot
assembly. There is a small pilot air inlet hole
about 2" from where the pilot ame comes out
of the pilot assembly (see Figure 26). With the
unit off, lightly blow air through the air inlet
hole. You may blow through a drinking straw
if compressed air is not available.
This manual suits for next models
3
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