Monessen Hearth DEB20 User manual
Installation and
Operating Instructions
44D0060 8/10 Rev. 9
440060
DEB cover
DEB Unvented Gas Logs
44D0060
Codes ......................................................................4
Gas Specifications ..................................................5
Gas Pressures ........................................................5
Ignition Controls ......................................................5
Pilot .........................................................................5
Thermal Generator ..................................................5
Combustion and Ventilation Air ...............................7
Installing Vented Applications ...............................1
Damper Stop Installation .......................................1
Place and Secure Appliance .................................1
Assembly Procedure .............................................13
Manual Control ......................................................14
Millivolt/Thermostat Control ..................................14
Connect Wall Switch or Thermostat ......................15
Connect Remote Receiver ....................................16
Install Thermostat Sensor .....................................16
Operation of Thermostat Sensor ...........................18
Check System Operation ......................................18
Millivolt/Thermostat Control ..................................1
Manual Control ......................................................1
Burner Flame Appearance ....................................
For Your Safety Read Before Lighting ..................4
Manual Control .....................................................5
Millivolt/Thermostat Control .................................6
To Turn Off Gas to Heater .....................................6
Match Lighting Instructions ...................................7
Burner Assembly ...................................................30
Accessories ...........................................................31
Logs ......................................................................3
DEB Unvented Gas Logs
44D0060 3
Please leave these instructions with the appliance.
Please retain these instructions for future reference
.
1. Due to high temperatures, the appliance should be
located out of traffic and away from furniture and
draperies.
. Children and adults should be alerted to the hazard
of high surface temperature and should stay away
to avoid burns or clothing ignition.
3. Young children should be carefully supervised when
they are in the same room with the appliance.
4. Do not place clothing or other flammable material
on or near the appliance.
5. Any safety screen or guard removed for servicing
an appliance, must be replaced prior to operating
the heater.
6. Installation and repair should be done by a qualified
service person.
7. To prevent malfunction and/or sooting, an unvented
gas heater should be cleaned before use and at
least annually by a professional service person.
More frequent cleaning may be required due to
excessive lint from carpeting, bedding material, etc.
It is imperative that control compartments, burners
and circulating air passageways be kept clean.
1. Correct installation of the ceramic fiber logs, proper
location of the heater, and annual cleaning are neces-
sary to avoid potential problems with sooting. Sooting,
resulting from improper installation or operation, can
settle on surfaces outside the fireplace. See log place-
ment instructions for proper installation.
13. Avoid any drafts that alter burner flame patterns. Do not
allow fans to blow directly into fireplace. Do not place
a blower inside burn area of firebox. Ceiling fans may
create drafts that alter burner flame patterns. Sooting
and improper burning will occur.
14. : Candles, incense, oil lamps, etc. produce
combustion byproducts including soot. Vent-free appli-
ances will not filter or clean soot produced by these
types of products. In addition, the smoke and/or aro-
matics (scents) may be reburnt in the vent-free appli-
ance which can produce odors. It is recommended to
minimize the use of candles, incense, etc. while the
vent-free appliance is in operation.
15. This is an unvented gas-fired heater. It uses air
(oxygen) from the room in which it is installed. Provi-
sions for adequate combustion and ventilation air must
be provided. Refer to Page 7.
16. Keep room area clear and free from combustible
materials, gasoline and other flammable vapors and
liquids.
17. Unvented gas heaters are a supplemental zone heater.
They are not intended to be the primary heating appli-
ance.
18. Unvented gas heaters emit moisture into the living
area. In most homes of average construction, this
does not pose a problem. In houses of extremely
tight construction, additional mechanical ventilation is
recommended.
19. During manufacturing, fabricating and shipping, various
components of this appliance are treated with certain
oils, films or bonding agents. These chemicals are not
harmful but may produce annoying smoke and smells
as they are burned off during the initial operation of the
appliance; possibly causing headaches or eye or lung
irritation. This is a normal and temporary occurrence.
8. Early signs of
carbon monoxide poisoning are similar to the flu with
headaches, dizziness and/or nausea. If you have these
signs, obtain fresh air immediately. Have the heater
serviced as it may not be operating properly.
9. The installation must conform with local codes or, in
the absence of local codes, with the National Fuel Gas
Code, ANSI Z3.l/NFPA54.
10. This unit complies with the latest edition of ANSI
Z1.11. Unvented Heaters and also complies with
ANSI Z1.60 / CSA .6 Decorative Vented Appliances
for Solid Fuel Burning Fireplaces. State and local
codes may only allow operation of this appliance in a
vented configuration. Check your state or local codes.
For vented operation, see “Vented Instructions” in this
manual.
11. Do not install the heaters in a bathroom or bedroom.
DEB Unvented Gas Logs
444D0060
The initial break-in operation should last two to three
hours with the burner at the highest setting. Provide
maximum ventilation by opening windows or doors to
allow odors to dissipate. Any odors remaining after this
initial break-in period will be slight and will disappear
with continued use.
0. Input ratings are shown in BTU per hour and are for
elevations up to ,000 feet. For elevations above ,000
feet, input ratings should be reduced 4 percent for each
1,000 feet above sea level. Refer to the National Fuel
Gas Code.
1. The appliance and its appliance main gas valve must
be disconnected from the gas supply piping system
during any pressure testing of that system at test pres-
sures in excess of 1/ psig (3.5 kPa).
. The appliance must be isolated from the gas supply
piping system by closing its equipment shutoff valve
during any pressure testing of the gas supply piping
system at test pressures equal to or less than 1/ psig
(3.5 kPa).
3. Do not use this room 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.
4. This appliance must not be used with glass doors in
the closed position. This can lead to pilot outages and
severe sooting outside the fireplace.
5. Never burn solid fuels in a fireplace where a unvented
room heater is installed.
6. Always have a fireplace screen in place when the
appliance is in operation and, unless other provisions
for combustion air are provided, the screen must have
an opening(s) for induction of combustion air.
Nous recommandons que nos
appareils de chauffage au gaz
soient installés et entretenus par
des professionnels qui ont été
accrédités aux È.U. par le National
Fireplace Institute ® (NFI) comme
étant des spécialistes du NFI en
matièred’appareils de chauffage
au gaz.
Adhere to all local codes or, in their absence, the latest edition of THE NATIONAL FUEL GAS CODE
ANSI Z3.1 or NFPA54 which can be obtained from…
American National Standards Institute, Inc.
1430 Broadway
New York, NY 10018
or
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 069
DEB Unvented Gas Logs
44D0060 5
Natural Propane (LP)
Manual Regulator Pressure 3.0” w.c. 10.0” w.c.
Millivolt Regulator Pressure 3.5” w.c. 10.0” w.c.
Millivolt Pilot Regulator 3.5” w.c. n/a
Max. Gas Inlet Pressure 10.5” w.c. 13.0” w.c.
Min. Gas Inlet Pressure 5.0" w.c. 11.0" w.c.
DEB0NM Nat. Manual 18,000 8,000
DEB0PM LP Manual 18,000 8,000
DEB4NM Nat. Manual 0,000 38,000
DEB4PM LP Manual 0,000 38,000
DEB30NM Nat. Manual 0,000 38,000
DEB30PM LP Manual 0,000 38,000
DEB0NV Nat. Millivolt 18,000 8,000
DEB0PV LP Millivolt 0,000 8,000
DEB4NV Nat. Millivolt 5,000 38,000
DEB4PV LP Millivolt 30,000 38,000
DEB30NV Nat. Millivolt 5,000 38,000
DEB30PV LP Millivolt 30,000 38,000
An external regulator is required to reduce supply
pressure to a maximum of 10.5" w.c. on Natural Gas sys-
tems operating at higher pressure.
An external regulator is required to reduce supply
pressure to a maximum of 13.0" w.c. for LP systems.
Piezo ignitor allows ignition of the pilot without the
use of matches or batteries.
- All gas to the gas logs is shut off at
the valve.
- Valve position to light/maintain a
standing pilot.
- Variable position corresponding to
desired flame height.
- All gas to the gas logs is shut off at
the valve.
- Valve position to light/maintain a
standing pilot.
- Valve position to turn ON/OFF log
set with remote switch/thermostat.
- Variable position to control flame
height (heat output).
The gas log heater is fitted with a specially designed
safety pilot (ODS assembly) which senses the amount
of oxygen available in the room and shuts the gas log
heater off if the oxygen level begins to drop below
a satisfactory level. The pilot can only be relit when
adequate fresh air is available.
The millivolt gas log pilot is fitted with a millivolt
(thermopile) generator to provide power for remote
activation.
DEB Unvented Gas Logs
644D0060
Check your packing list to verify that all listed parts have
been received. You should have the following:
• Unvented gas log grate/burner assembly
• Two () plastic bags containing crushed volcanic
rock
• Installation/operating instructions
• Two () anchoring screws
• Ceramic fiber logs
The millivolt controlled version of this heater is the only
style designed to be operated with optional devices for
ON/OFF functions. The following options may be used
with the millivolt controlled heater. These options are not
packaged with the log set.
• Hand held Remote with receiver
• Wall thermostat with 15' wire
• Wall switch with 15' wire
• Hand held Thermostat Remote with receiver
• Thermostat sensor
Carefully inspect the contents for shipping damage. If any
parts are missing or damaged, immediately inform the
dealer from whom you purchased the appliance.
You should have the following items available before pro-
ceeding with installation:
• External regulator (for propane/LPG and 1/ lb.
natural gas systems only)
• Piping which complies with local codes
• Sediment trap (recommended)
• Screwdriver
• Tee joint.
• Pipe sealant approved for use with propane/LPG
(Resistant to sulfur compounds)
• Drill with 5/3 bit
• Pipe wrench or appropriate size crescent wrench
set
• Manual shutoff valve
DEB Unvented Gas Logs
44D0060 7
This heater shall not be installed in a confined space or unusually tight construction unless
provisions are provided for adequate combustion and ventilation air.
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 aggre-
gate 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.
a) walls and ceilings exposed to the outside atmosphere have a continuous water vapor re-
tarder with a rating of 1 perm
(6 x 1011 kg per pa/sec-m) or less with openings gasketed or sealed;
b) weather striping 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 pen-
etrations for plumbing, electrical, and gas lines, and at other openings.
The following formula can be used to determine the maximum heater rating per the definition
of unconfined space:
(L1 + L) Ft x (W) Ft x (H) Ft
50
Consider two connecting rooms with an open area between, with the following dimensions:
L1 = 15Z\x Ft., L = 1 Ft., W = 1 Ft., H = 8 Ft.
(15Z\x + 1) x (1) x (8)
50
If there were a door between the two rooms the calculation would be based only on the room
with the heater.
(15Z\x) x (1) x (8)
50
x 1000
x 1000 = 5800 BTU/hr
x 1000 = 9,760 BTU/hr
BTU/hr =
BTU/hr =
BTU/hr =
W
H
FP2439
combustion air
Room Divider
Fireplace
FP439
Figure 1 -
Example of a Large Room with 1/2 Wall Divider
DEB Unvented Gas Logs
844D0060
Exception:
The DEB Series unvented room heater is approved for
installation into the following unvented fireplaces:
The DEB Series unvented room heater may also be
installed into a Ventless Firebox Enclosure for Gas Fired
Decorative Type Unvented Room Heaters per IAS Require-
ment No. -97 ANSI Z1.91-001 (typically referred to as a
"Universal Firebox"), as long as firebox hearth dimensions
meet the minimum hearth dimensions shown below.
C
A
D
B
FP2530
hearth dims
DEB0 7” 13Z\v” 18” 17”
(686 mm) (337 mm) (457 mm) (43 mm)
DEB4 8Z\x” 13Z\v” Z\v” 17”
(74 mm) (337 mm) (565 mm) (43 mm)
DEB30 3Z\x” 13Z\v” 5Z\x” 17”
30” Logs (86 mm) (337 m) (648 mm) (43 mm)
Figure 2 -
Hearth Minimum Dimensions
FP530
The following are guidelines for placing a gas log set in
a fireplace that has a restrictive barrier along the bottom
front opening of the fireplace. Some examples of barri-
ers are glass/screen door frames and sunken/recessed
fireplaces.
No Restriction 13Z\v”
0” to 1Z\x” 16”
Greater than 1Z\x” to 3” 16”
Greater than 3” *
*Any barrier greater than 3” placed in front of the gas log
set is not recommended by the manufacturer.
Non combustible material such as refractory brick
may be used to line the floor of the fireplace in order to raise
the height of the gas log set in relation to a restrictive barrier.
If the unit is raised, the minimum height dimension listed in
the homeowner’s manual must not be exceeded.
If the log set is equipped with a remote receiver, a
restrictive barrier may reduce the battery life by increasing
the ambient temperature inside the fireplace. Placement
of the receiver outside of the fireplace will extend the
battery life.
X
FP2794
logs in enclosure
Depth of Fire-
place/Firebox
(Refer to
Table)
The log set should
be placed against or
as near as possible
to the rear wall of the
fireplace
Glass door frames
with adjustable
louvers should
have the louvers
fully open while
the unit is in
operation
Height of restrictive bar-
rier caused by glass door
frames, recessed fireplaces,
etc. from the base or bottom
surface of the unit. (Refer to
Table).
Figure 3 -
Reference Drawing of a Natural
Flame Log Set in an Enclosure FP794
DEB Unvented Gas Logs
44D0060 9
minimum clearances
Follow these instructions carefully to ensure safe installation. Failure to
follow instructions exactly can create a fire hazard.
The sides of the fire-
place opening must be at least 16" from any combustible
wall. The ceiling must be at least 42" from the top of the
fireplace opening.
16"
42"
FP1996
wall ceiling clearances
Figure 4 -
Sidewall and Ceiling Clearances
FP1996
To install the gas logs into a fireplace with no wooden
mantel, shelf or other combustible projection above the
fireplace opening, measure the heat resistant material
height, per Figure 5, then see TABLE A.
Heat resistant materials such as slate and marble must
IMPORTANT: If you cannot meet these minimum clear-
ances you must operate the heater with chimney flue
damper open. Refer to “Installing Vented Applications”
found on page 18.
FP2795
Measure heat resist material
Heat Resis-
tant Material
Measure This
Distance
Heater in
Fireplace or
Firebox
FP795
Figure 5 -
Measure Heat Resistant Material
Table A -
Heat Resistant Material Requirements with No
Mantel or Combustible Projection
1” or more Hood not required
8” or less than 1” Hood not required Extend heat
resistant mat’l to
1” or install hood
Figure 5
Less than 8” Extend heat resistant Extend heat
material to at least 8” resistant mat’l to
and install hood. at least 8” and
Figure 5 install hood.
Figure 5.
, extend heat
resistant material
to a height of at
least 1”
DEB Unvented Gas Logs
10 44D0060
To install the heater with a wooden mantel, shelf or other
combustible projection above, first measure the heat resis-
tant material shown in Figure 6, then refer to Table B.
FP2796
mantel
8” or More of
Heat Resistant
Material
Hood
Heater in Fire-
place of Firebox
FP796
Figure 6 -
Measure Heat Resistant Material for Mantel
1” or more Hood not required. Hood not required.
Observe profiles (side Observe profile (side
elevations) shown on Page elevations) shown on
15, Fig. 7 Page 16, Figure 9
8” to less than 1” Install hood and observe Install hood and ob-
profiles shown on Page 15, serve profiles shown on
Figure 8, OR, extend heat Page 15, Figure 7, OR,
resistant material to at extend heat resistant
least 1” and observe material to at least 1”
profiles shown on Page 15, and observe profiles
Fig. 7. shown on Page 16, Fig. 9
Less than 8” Extend heat resistant mat’l Extend heat resistant
to at least 8”, install hood material to at least 8”,
and observe profiles shown install hood and observe
on Page 15, Fig. 8, OR profile shown on Page
extend heat resistant 15, Fig. 7; OR extend
material to at least 1” and resistant material to at
observe profiles shown on least 1” and observe
Page 15, Fig. 8. profiles shown on Page
16, Fig. 9.
Table B -
Heat Resistant Material Heights and Mantel Location
10”
8”
6”
256O”
8”
14”
2056O”
246”
28”
Fp2797
mantel no hood
Heat Resistant
Material
Heater in Fire-
place or Firebox
FP797
Figure 7 -
DEB20 Minimum Mantel Clearance with No Hood
A mantel
may project from the
wall a of
Z\x" at a of
14" above the opening,
and a maximum of 6"
at a of 0Z\x"
above the opening.
12”
10”
8”
6”
256O”
8”
1456O”
186”
2256O”
26”
FP2798
mantel with hood
Heat Resistant
Material
Heater in
Fireplace or
Firebox
Hood
FP798
Figure 8 -
All Models Minimum Mantel Clearance with a Hood
A mantel may
project from the wall a
of Z\x" at a
of 8" above
the opening, and a maxi-
mum of 6" at a
of 14Z\x" above the open-
ing.
DEB Unvented Gas Logs
44D0060 11
10” or Less
28”
12”
Min.
Fp2799
mantel no hood 24
Heat Resistant
Material
Heater in Fire-
place or Firebox
FP799
Figure 9 -
DEB24/30 Minimum Mantel Clearance with No Hood
The
bottom of the
mantel may project
from the wall a
maximum of 10" at
a minimum of 8"
above the opening.
7”
6”
256O”
4” 8”
1456O”
FP2800
bad mantel
Minimum of 8”
Heat Resistant
Material
Hood
Mantel
FP800
Figure 10 -
DEB24/30 Example of Unsafe Installation - Mini-
mum Mantel Clearance with No Hood
Figure 10 is an example of an unsafe mantel instal-
lation. This mantel projects 4" at 8" above the opening,
exceeding the maximum acceptable distance of Z\x" The
mantel also projects 7" at 14Z\x" above the opening, exceed-
ing the maximum acceptable distance of 6".
If your mantel profile is unsafe, you may either:
• Raise the mantel to an acceptable height
• Remove the mantel
5” Minimum
FP2876
combustible floor
Heater in
Fireplace or
Firebox
Combustible
Material
FP876
The gas log heater must be installed at least 5" above any
combustible flooring material, such as carpeting or tile,
which is closer than 14" to the base of the fireplace. The
minimum distance must be maintained from the top surface
of carpeting, tile, etc. Figure 11
,
The gas log heater may be installed nearer to the floor if a
minimum of 14" of noncombustible material such as slate
or marble is installed between the base of the fireplace and
the combustible flooring. Figure 12
Figure 11 -
Minimum Clearance above Combustible Flooring
14” Minimum
FP2802
non combustible floor
Heater in
Fireplace or
Firebox Combustible
Material
This Distance
May Now be
Less than 5”
Figure 12 -
Minimum Clearance above Combustible Floor with Non-
combustible Material Installed at Base of Fireplace
DEB Unvented Gas Logs
1 44D0060
• Turn the gas supply to the fireplace or firebox.
• Seal any fresh air vents and/or ash clean-out doors
located on the floor or wall of the fireplace. If left
unsealed, drafting may cause pilot outage or sooting.
Use a heat resistant sealant.
Manual and millivolt controlled gas logs may be
installed as a vented decorative log set in compli-
ance with ANSI Z1.60 and National Fuel Gas Code,
Section 6.6.
Exception:
• Turn off gas supply to fireplace or firebox.
• Have the fireplace floor and chimney professionally
cleaned to remove ashes, soot, creosote or other
obstructions. Have this cleaning performed annually
after installation.
• Seal any fresh air vents or ash clean-out doors located
on floor or wall of fireplace. If not, drafting may cause
pilot outage or sooting. Use a heat-resistant sealant.
A damper stop must be provided with the unit. Contact your
dealer to obtain one. The damper stop must be installed as
shown in Figure 13 to prevent full closure of the fireplace
damper blade and provide a minimum 9 square inch flue
opening.
FP2538
damper stop
Damper
Stop
Damper
FP538 Figure 13 -
Damper Stop Installation
(See Warning)
Placement in a
Fireplace with Restrictive Barrier
DEB Unvented Gas Logs
44D0060 13
FP2877
DEB secure to floor
1. Center the gas log unit in the fireplace or firebox. Make
certain the front feet of the grate sit inside the front edge
of the fireplace or firebox.
. Anchor holes are located on the right and left sides of
the unit. After centering the grate correctly, mark the
hole positions on the fireplace/firebox floor. Drill two ()
B\cx" diameter holes approximately 1Z\x" deep.
3. Anchor the grate to the fireplace/firebox floor using the
screws provided. Figure 14
Screws
Anchor
Holes
FP803
Figure 14 -
Secure Heater to Floor of Fireplace or Firebox
A qualified gas appliance installer must connect
the heater to the gas supply. Consult all local codes.
Figure 15
FP2371
gas connect
Stainless
Flexible
Tube Pipe
Possible Locations
for Pressure
Tapping Point
Gas
Supply
Inlet
To
Heater
Valve
Pipe
Coupling
Manual Shutoff
Valve
FP371
Figure 15 -
Gas Connection
, to reduce the supply tank pressure to a maximum of
13" w.c. This is in addition to the internal regulator in the
heater valve.
DEB Unvented Gas Logs
14 44D0060
The heater gas inlet connection is a 3/8" NPT at the valve.
On all control type units, the inlet connection is on the right
side of unit. To connect from the opposite side, route the
pipe around the back portion of the unit.
When tightening up the joint to the valve, hold the valve
securely to prevent movement.
Test all gas joints from the gas meter to the heater valve
for leaks using a gas analyzer or soap and water solution
after completing connection.
Check the gas pressure with the appliance burning and
the control set to .
Figure 16
If the pressure is not as specified,
replace the regulator with the correct part from the parts
list in this manual.
Remove 1/8" NPT plug, located on side of regulator body.
Install fitting and tubing to pressure gauge. After taking
pressure reading, reinstall test plug. Check for gas leaks.
FP2499
manual valve
NPT Test Plug
FP499
Figure 16 -
Manual Control Pressure
Test Point Location
Figure 17
The valve regulator controls the burner pressure which
should be checked at the pressure test point.
Turn captured screw counter clockwise two or thre turns
and then place tubing to pressure gauge over test point
(Use test point “OUT” closest to control knob). After taking
pressure reading, be sure and turn captured screw clock-
wise firmly to re-seal. Do not over torque. Check for gas
leaks.
FP2372
millivolt valve
Test Port “Out”
FP37
Figure 17 -
Millivolt Control Pressure
Test Point Location
DEB Unvented Gas Logs
44D0060 15
FP2112
wiring diagram
12/08
Wall
Switch
On/Off Switch
On/Off
Switch
Millivolt
Valve
ODS Pilot
TH = 3
TP = 1
TP/TH =
ODS Pilot
Spade Terminal
Switch
Optional Wall
Switch, Remote
Receiver or
Optional T-Stat
FP11
Figure 18 -
Wiring Diagram
The millivolt valve is a self-powered combination gas control
1. Use 18 awg, two-wire cable, 15 feet maximum length.
. At one end of the cable, connect both wires to the wall
switch or thermostat. At the other end, connect one
wire to TP/TH and one wire to TH, or connect the wall
switch/thermostat to the two male (0.5") terminals on
the left side of the unit. The color of the wires does not
matter.
DEB Unvented Gas Logs
16 44D0060
FP2878
install remote receiver
Connect the connectors to the two () .5” male connectors
located on the right side when facing the unit. Figure 19.
Do not allow the wire to touch the grate or burners.
Heat reduces battery life. You can protect the
receiver and extend battery life by mounting the receiver
in a wall or other location outside the fireplace.
Remote
Wire
Connectors
Remote
Receiver
FP878
Figure 19 -
Install Remote Receiver
OPTION SOLD SEPARATELY
1. Remove metal bracket and label from box.
. Peel away the paper backing on the label. Align holes
in label with holes on the bracket. Right side of label
should flush with right side of bracket. Figure 20. Press
label firmly and smoothly to bracket.
3. Using Phillips screwdriver, install t-stat sensor to bracket
with two screws provided. Figure 21. Make sure the
thermo bulb wire is at the bottom of t-stat sensor.
4. Plug in wiring harnesses to back of t-stat sensor. Figure
21.
HIGH
LOW
26D3317
THERMOSTAT
SETTING
FP2879
place labor
Align
Holes
Align Edges of
Label to Right Side
of Bracket
FP879
Figure 20 -
Apply Label to Bracket
HIGH
LOW
26D3317
THERMOSTAT
SETTING
FP2880
install sensors
Wiring
Harnesses
T-Stat Sensor
Bracket
Screws Thermo Bulb
FP880
Figure 21 -
Install T-Stat Sensor and
Wiring Harnesses
DEB Unvented Gas Logs
44D0060 17
HIGH
LOW
26D3317
THERMOSTAT
SETTING
FP2881
install Tstat
5. Route wiring harnesses through large hole on side of unit. Mount bracket to side of unit with
screw provided. Figure 22
6. Attach wiring harness to either TP/TH and TH on control valve or to existing wiring harness
with two () 0.50" male spade terminals for remote or t-stat option. Figures 22 and 23.
7. Install knob to shaft of t-stat sensor. Figure 22.
8. Place thermo bulb in front of the firebox for incoming air.
Knob
Thermo Bulb
Screw
T-Stat Sensor
and Bracket
Wiring Harnesses
FP881
Figure 22 -
Install T-Stat Sensor to DEB Base
FP2808
attach tstat to valve
Figure 23 -
Attach Wiring Harnesses to Control Valve
Wiring Harnesses
TH
TP/TH
FP808
DEB Unvented Gas Logs
18 44D0060
HIGH
LOW
26D3317
THERMOSTAT
SETTING
FP2882
DEB controls
1. Follow millivolt lighting instructions on lighting plate
attached to unit or in homeowner’s manual.
. With control knob in the “ON” position make sure
the ON/OFF switch is in the “OFF” position. Figure
24
3. The unit is now being controlled by the thermostat
sensor. The sensor will now cycle the burners on
and off. You can adjust how often the unit cycles
by turning the control knob on the sensor.
Control Knob
On/Off Switch
T-Stat Sensor
FP88
Figure 24 -
Control Knob in “ON” Position and
ON/OFF Switch in “OFF” Position
The millivolt system and individual components may be checked with a millivolt meter hav-
ing a 1-1000 mV range. Conduct each check shown in chart by connecting meter test leads
to terminals as indicated.
A. Complete Millivolt System Check
(“A” Reading - Thermostat contacts CLOSED - Control knob “ON” - Main burner should
turn ON)
1. If reading is more than 175 millivolts and the automatic valve still does not come on,
replace the control.
. If the closed circuit reading (“A” reading) is less than 175 millivolts, determine cause
for low reading, proceed to Section B.
B. Thermopile Output Reading Check
(“B” Reading - thermostat contacts OPEN - Main burner OFF
1. Check gas pressure to the unit. If gas pressure is within minimum and maximum on
data plate, then check pilot voltage, 500 millivolts minimum. If the minimum millivolt
reading is not obtainable, replace pilot.
A Complete TP/TH and TH Closed Minimum 175
System
B Thermopile TP and TP/TH Open Minimum 500
Output
DEB Unvented Gas Logs
44D0060 19
— This unit is supplied with four or five ceramic fiber logs. Do not handle these logs with your
bare hands. After handling the logs, wash
your hands gently with soap and water to remove any traces of fibers.
Figures 25 and 26
LG1024
DEB20 logs
Log #6
Log #4
Log #1
Log #1
Log #
Left
Front
Pin
Right Front and
Center Pins
LG104
NOTE: Model DEB20 has 4 logs and models
DEB24 and DEB30 have 5 logs.
1. Install back log (#1) on two pins located near the
back of base. Check log position and stability.
. Install right center log (#) on pins located near
right front of base and center of base.
3. Install left center log (#3) on pin located near left
front of base and on top of right center log (#).
4. Install middle front log (#4) in front of center log.
Make sure bottom of log is resting on the center of
grate. Do not let log #4 contact the front burner.
5. Rest right end of left
front log (#5) on log #3 and the top of left front log
on log #1.
6. Place back end of top center log (#5) on recessed
area of back log (#1). Cross log #6 over log # and
rest right extension on grate. Log #6 should fit on
pin on center log #3.
Figure 25 -
Place Logs on
Grate (DEB20)
DEB Unvented Gas Logs
0 44D0060
LG1005
DEB24 30 logs
Log #6
Log #4
Log #3 Log #1
Log #5
(4 & 30
Only)
Log #
Right Front
and Center
Pins
Back
Pins
LG105
Left Front
Pin
Figure 26 -
Place Logs on Grate
(DEB24/30)
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