Monessen Hearth Vent Free Insert DIS33G User manual
This is an unvented gas-red 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 Page
7.
23D8020 7/11 Rev. 7
DIS33G Vent Free Gas Fireplace System
223D8020
Codes ...................................................................... 4
Operation ................................................................ 5
Gas Pressures ........................................................ 5
Gas Specications .................................................. 5
Ignition Controls ...................................................... 5
Pilot ......................................................................... 5
Thermal Generator .................................................. 5
Framing Dimensions ............................................... 6
Getting Started ........................................................ 7
What You Will Need to Get Started ......................... 7
Remove Screen .................................................... 10
Install Canopy ....................................................... 1
Secure Heater to Floor .......................................... 11
Connect Optional Wall Switch or Thermostat ....... 14
Connect Remote Receiver .................................... 15
Check System Operation ...................................... 15
What to Do if You Smell Gas ................................. 22
Millivolt Control Lighting Instructions ..................... 23
To Turn Off Gas to Heater ..................................... 23
Match Lighting Instructions ................................... 24
Firebox Assembly ................................................. 28
Grate and Base Assembly ................................... 30
Logs ...................................................................... 32
DIS33G Vent Free Gas Fireplace System
23D8020 3
13. Avoid any drafts that alter burner ame patterns. Do not
allow fans to blow directly into replace. Do not place
a blower inside burn area of rebox. Ceiling fans may
create drafts that alter burner ame patterns. Sooting
and improper burning will occur.
14. : Candles, incense, oil lamps, etc. produce
combustion byproducts including soot. Vent-free
appliances will not lter or clean soot produced by
these types of products. In addition, the smoke and/or
aromatics (scents) may be reburned in the vent-free
appliance 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. Page 7
16. This heater shall not be installed in a room or space
unless the required volume of indoor combustion air is
provided by the method described in the National Fuel
Gas Code, ANSI Z223.1/NFPA 54, the International
Fuel Gas Code or applicable local codes.
17. Keep room area clear and free from combustible
materials, gasoline and other ammable vapors and
liquids.
18. Unvented gas heaters are a supplemental zone heater.
They are not intended to be the primary heating appli-
ance.
19. 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.
20. During manufacturing, fabricating and shipping, various
components of this appliance are treated with certain
oils, lms 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.
1. Due to high temperatures, the appliance should be
located out of trafc and away from furniture and
draperies.
2. 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 ammable 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 qualied
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 materials,
etc. It is imperative that control compartments,
burners and circulating air passageways be kept
clean.
Please leave these instructions with the appliance.
Please retain these instructions for future reference
.
8. Early signs of
carbon monoxide poisoning are similar to the u 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
10. This unit complies with the latest edition of ANSI
Z21.11.2, Unvented Heaters.
11. Do not install the heaters in a bathroom or bedroom.
12. Correct installation of the ceramic ber 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 replace. See log place-
ment instructions for proper installation.
DIS33G Vent Free Gas Fireplace System
423D8020
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.
21. Input ratings are shown in BTU per hour and are for
elevations up to 2,000 feet. For elevations above 2,000
feet, input ratings should be reduced 4 percent for each
1,000 feet above sea level. Refer to the National Fuel
Gas Code.
22. 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 1/2 psig (3.5 kPa).
23. 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 1/2 psig
(3.5 kPa).
24. Do not use this room heater if any part has been 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.
25. Never burn solid fuels in a replace where a unvented
room heater is installed.
26. Always have a replace 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 Z223.1 or NFPA54 which can be obtained from…
1430 Broadway
New York, NY 10018
or
Batterymarch Park
Quincy, MA 02269
DIS33G Vent Free Gas Fireplace System
23D8020 5
Your vent-free replace must be mounted to the oor or
the replace hearth.
This unvented gas heater requires no outside venting and
burns cleanly with high heating efciency.
FP2769
DIS33 product features
Piezo
Ignitor
Fireplace
Screen
Control Knobs
Optional
Face Plate
Figure 1 -
Unvented Gas Heater with Control Access Door Open
On/Off
Switch Blower
Optional T-stat
Sensor
FP2769
Regulator Pressure Natural 3.5” w.c.
Pilot Regulator Natural 3.5” w.c.
Max. Inlet Pressure Natural 10.5” w.c.
Min. Inlet Pressure Natural 5.0” w.c.
Regulator Pressure LP 10.0” w.c.
Max. Inlet Pressure LP 13.0” w.c.
Min. Inlet Pressure LP 11.0” w.c.
DIS33NTG Natural Millivolt 28,000 19,000
DIS33PTG LP Millivolt 28,000 23,000
DIS33NVG Natural T-Stat 28,000 19,000
DIS33PVG LP T-Stat 28,000 23,000
For LP models an external regulator is required
to reduce supply pressure to a maximum of 13" w.c.
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.
- Valve position to turn ON/OFF log set with
remote switch/thermostat.
- Variable position to control ame height
(heat output). Both front and rear burners
are in operation to provide realistic glow
and yellow ame.
The gas log heater is tted with a specially designed safety
pilot light (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 milli-volt gas log pilot is tted with a milli-volt generator
to provide power for remote activation.
DIS33G Vent Free Gas Fireplace System
623D8020
3356O” Rough Opening Width
Rough
Opening
Depth
1/2”
or 5/8”
Rough
Opening
Height
238020
DIS33G dims
16”
3756M”
31(6”
6456M”
3756M”
2756O”
3356O” Rough Opening Width
Rough
Opening
Depth
1/2”
or 5/8”
Rough
Opening
Height
16”
3756M”
31(6”
6456M”
3756M”
2756O”
Figure 2 -
Framing Dimensions
If unit is to be “built in,” replace framing can be built before
or after the appliance is set in place.
Construct replace framing
following Figure 2. Refer to Figure 5 on Page 9 for replace
dimensions. The framing headers may not rest directly on
top of the rebox.
The replace may be installed directly on a combustible
oor or a raised platform of an appropriate height. Do
not place replace on carpeting, vinyl, tile or other soft
oor coverings. It may, however, be placed on at wood,
plywood, particle board or other hard surfaces. Be sure
replace rests on a solid continuous oor or platform with
appropriate framing for support and so that no cold air can
enter from under the rebox.
DIS33G Vent Free Gas Fireplace System
23D8020 7
Make sure you have received all parts
Check your packing list to verify that all listed parts have
been received. You should have the following:
• Installation/Operating instructions
• Black Louvers (5)
• 33" unvented gas heater with brick panels.
• Canopy
• Volcanic rock and rock wool
• Two (2) anchoring screws
• Mounting screws for canopy
• Log box (refer to installation instructions)
Accessory face plates available to nish the insert.
• DIFACESM Black small face 33"H x 43"W
• DIFACELG Black large face 36"H x 50"W
Accessories include brass trim and mounting hardware
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 milli-volt controlled heater. These options are not
packaged with the log set.
• Hand held Remote with Receiver
• Wall switch with 15' wire.
• Wall T-stat 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. Do not
attempt to install any part of the appliance unless you have
all parts in good condition.
You must have the following items available before pro-
ceeding with installation…
• External regulator (for propane / L.P.G. and 1/2 lb.
Natural Gas Systems only)
• Piping which complies with local codes
• Sediment trap
• Tee joint
• Pipe wrench or appropriate size crescent wrench
set
• Phillips head screwdriver
• Drill with 5/32" bit
• Optional face plate kit.
• Manual shutoff valve
• Optional trim kit for installation into wall or free stand-
ing mantel without three piece faceplate
• Pipe sealant approved for use with propane / LPG
(Resistant to sulfur compounds)
National
Fuel Gas Code, ANSI Z223.1/NFPA 54
International Fuel Gas Code
DIS33G Vent Free Gas Fireplace System
823D8020
minimum clearances
Follow these instructions carefully to ensure safe installation. Failure to
follow instructions exactly can create a re hazard.
Clearances are necessary to combustible surfaces
only. No clearance is necessary for noncombustible sur-
face.
The clearance from the inside of the
appliance to any combustible adjacent wall should no be
less than 9". Figure 3
The ceiling must be at least 42" from
the top of the rebox opening. Figure 3
The appliance can be placed against
the combustible back wall.
The replace may not be installed onto
any combustible ooring material, such as carpeting, vinyl
or tile without the hearth or a minimum 22 GA (0.030") metal
or a minimum 1/2" wooden base covering the entire width
and depth of the base.
The canopy supplied with the unit must
be installed. If a combustible mantel is installed. It must
meet the clearance requirements shown in Figure 6.
FP2770
sidewall ceiling clearances
9"
Minimum
9"
Minimum
42"
Minimum
Figure 3 -
Sidewall and Ceiling Minimum Clearances
FP2770
33"
1556M"
22
6M
"
23(6"
B
A
FP2771
Fireplace install
A B
Small 33" 43"
Large 36" 50"
Figure 4 -
Dimensions for Installing in Masonry Fireplace
or UL Listed Box
FP2771
Have replace oor and chimney professionally cleaned to
remove ashes, soot, creosote or other obstructions. Close
and seal any fresh air vents or ash clean-out doors located
on oor or wall
DIS33G Vent Free Gas Fireplace System
23D8020 9
Heat resistant material (minimum requirements) with
wooden mantel or other combustible projection:
To install the heater with a wooden mantel shelf or other
combustible projection above, rst measure the heat resis-
tant material shown in Figure 5.
FP2772
mantel material
No combustible
materials within 8"
of opening.
Do not cover
louvers.
Hood
Grate
FP2772
Figure 5 -
Measure Heat Resistant Material for Mantel
A mantel may
project from the wall a maxi-
mum of 2Z\x" at minimum
of 8" above the opening,
and a maximum of 12" at a
minimum of 26" above the
opening.
10"
12"
14"
26"
8"
12"
10"
8"
6"
256O”
FP2773
Min mantel clearances
Figure 6 -
Minimum Mantel Clearances
FP2773
Figure 7 is an example of an unsafe mantel installation.
The mantel projects 4" at 8" above the opening, exceed-
ing the maximum acceptable distance of 2Z\x". The mantel
also projects 8" at 10" above the opening, exceeding the
maximum acceptable distance of 6".
If your mantel prole is unsafe, you may either:
• Raise the mantel to an acceptable height or,
• Remove the mantel.
8"
4"
21/2"
10"
6"
8"
FP2774
unsafe mantel
Hood
No combustible
materials within 8" of
opening.
Do not cover louvers.
FP2773
Figure 7 -
Unsafe Mantel Clearances
DIS33G Vent Free Gas Fireplace System
10 23D8020
The gas log heater must be installed at least 5" above
any combustible ooring material, such as carpeting or
tile, which is closer than 14" to the base of the replace.
Figure 8
5"
1”
FP2775
min clearance above comb floor
Combustible
Material
Noncombustible
Material
Figure 8 -
Minimum Clearance above
Combustible Flooring
FP2775
Remove replace screen by pushing screen frame panel
up and out. Figure 9
Fireplace screen must be removed to access log
box and to install canopy.
FP2776
remove screen
Figure 9 -
Remove Fireplace Screen
FP2776
1. Remove the replace screen as described in the previ-
ous section.
2. Align canopy with the holes in the top frame assembly.
Figure 10
3. Install the ve (5) screws (in owner’s manual packag-
ing) which attach the canopy to the top frame assembly.
Figure 10
4. Tighten all screws. Make sure the canopy is level and
secure. Install the replace screen.
FP2777
install canopy
Figure 10 -
Install Canopy
FP2777
DIS33G Vent Free Gas Fireplace System
23D8020 11
Clearance requirements as detailed in “Clearances and Height Requirements” section
of this manual must be met before securing heater in place.
To prevent movement, the heater must be secured to the oor or hearth.
1. Lift off louvers and remove the screen.
2. Remove log set.
3. To remove the grate and base assembly, take out two screws as shown in Figure 11.
4. Lift grate and base assembly out of the rebox.
5. Secure the rebox with two anchoring screws (3/16" x 1Z\v" length) supplied with the
replace system. Figure 12
If the unit is mounted on carpeting, tile or combustible material without the hearth, a
metal or wooden base covering the entire width and depth of the base must be installed.
FP2778
remove grate and base assy
Fp2779
Secure firebox
Figure 11 -
Remove Grate and Base Assembly
FP2778
Figure 12 -
Secure Firebox to Floor or Hearth FP2779
DIS33G Vent Free Gas Fireplace System
12 23D8020
A qualied gas appliance installer must connect the heater to the gas supply.
Consult all local codes.
Figure 13
FP2447
gas connection
3” Min.
To Fireplace
Pipe Coupling
Stainless
Flexible Tube
Pipe
Locations Pressure
Tapping Point Instal-
lation
Manual Shutoff
Valve
Gas Supply
Inlet
Figure 13 -
Gas Connection
FP2447
Loosen the pipe adapter on the ex tube
before installing to the system piping.
Always use an external regulator for all propane/LPG heat-
ers only, 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.
To reach factory installed ex line, go through access door
on right or left side of rebox.
FP2780
gas line access
Cord Protector
Manual Gas
Shutoff
(Recommended
Outlet Positioned
Vertical)
Stainless Flex Line
Access Door
for Gas Line
FP2780
Figure 14 -
Access Holes
DIS33G Vent Free Gas Fireplace System
23D8020 13
Figure 15
The valve regulator controls the burner pressure which
should be checked at the pressure test point.
Turn captured screw counter clockwise two or three 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 rmly to re-seal. Do not over torque. Check for gas
leaks.
The stainless ex line is on the right side facing the re-
place and can connect to either a 3/8 NPT female or 1/2
NPT male pipe. To connect from the opposite side, route
the pipe under the rear portion of the unit.
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 .
Open control access door on either side of unit to nd valve
and regulator referred to below. Page 12, Figure 14
FP2781
millivolt valve
Test Port
"OUT"
FP2781
Figure 15 -
Pressure Test Point Location
Millivolt Control
DIS33G Vent Free Gas Fireplace System
14 23D8020
FP2112a
wiring diagram
8/09
Figure 16 -
Wiring Diagram Switch
On/Off
Switch
On/Off
Switch
ODS Pilot
Valve
TH = 3
TP = 1
TP/TH = 2
ODS
Pilot
Spade
Terminal
FP2112a
The milli-volt valve is a self-powered combination gas
control
Refer to Figure 16 and installation instructions provided
with optional wall switch, thermostat or remote control for
wiring instructions. A maximum length of 15 feet of 18awg
two conductor wire is to be used for wall switch or ther-
mostat installations.
Thermostats and switches must be suitable for
millivolt operation.
1. Use 18 awg, two-wire cable, 15 feet maximum length.
2. 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 (0.25") terminals on
the left side of the unit. The color of the wires does not
matter.
Field Installed Optional
Wall Switch or
Remote Receiver
DIS33G Vent Free Gas Fireplace System
23D8020 15
FP2782
remote receiver
Remote
Receiver
FP2782
Figure 17 -
Install Remote Receiver
The milli-volt system and individual components may be checked with a milli-volt meter having
a 0-1000 mV range. Conduct each check shown in chart below by connection meter test leads
to terminals as indicated.
a. If the reading is more than 100 milli-volts and the automatic valve still does not come on,
replace the control.
b. If the closed circuit reading (“A” reading) is less than 100 millivolts, determine cause for
low reading, proceed to Section B below.
1. Check gas pressure to the unit. If gas pressure is within minimum and maximum on data
plate, then check pilot voltage, 325 millivolts minimum. If the minimum milli-volt reading
is not obtainable, replace pilot.
A Complete 2 & 3 Closed Closed
System
B Thermopile 1 & 2 Open Open
Output
THESE INSTRUCTIONS SUPERCEDE THE SECTION
ENTITLED “HEARTH MOUNT” IN THE
HAND-HELD REMOTE INSTRUCTIONS SUPPLIED
WITH THE REMOTE.
Figure 17
1. Remove bottom louvre door.
2. Connect the remote connectors located in the unit.
3. Stick Velcro• pads with self-adhesive backing to bottom
of remote receiver and to oor of compartment behind
access panel.
4. Attach remote receiver to rebox with Velcro• pads.
Control switch must face forward.
Do not place remote in combustion chamber.
DIS33G Vent Free Gas Fireplace System
16 23D8020
Always check local building codes. The installation must comply with local
regulations as well as the national electric codes.
If any of the original wire as supplied with the replace must be replaced, contact dealer for
proper replacement wiring harness. (Refer to parts list for correct part number). 120 volts, 60Hz,
1 amp.
Electrical power cord (plug) can be routed to exit the DIS33 on either the left side or the right
side. Remove cord protector from side of unit, route power cord through hole opposite side.
Reinstall cord protector.
110/115
V.A.C.
Fan Switch
OFF
Black
White
Green
ON
Thermostat
Control
Blower
Motor
Black
FP2783
DIS wiring
Figure 18 -
DIS Wiring Diagram
DIS33G Vent Free Gas Fireplace System
23D8020 17
— This unit is supplied with six (6) ce-
ramic ber 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 bers.
LG925
DIS33G rear log
Rear Log #1
Pins
LG925
Figure 19
1. Place rear log (#1) on two
pins located on the back of the
grate. Figure 19
DIS33G Vent Free Gas Fireplace System
18 23D8020
LG926
DIS33G right left base logs
Left Base
Log #3
Left Base
Log #3
Right Base
Log #2
Right Base Log
#2
Pins
Pins
LG926
Figure 20
2. Place right base log (#2) on two pins on right side
of grate. Figure 20
3. Place left base log (#3) on two pins on left side
of grate. Figure 20
LG927
DIS33G top front logs
Pins
Left Top
Log #5
Left Top Log #5
Right Front
Log #4
Right Front
Log #4
LG927
Figure 21
4. Place right front log (#4) on two pins on bot-
tom right side of grate. Figure 21
5. Place right end of left top log (#5) on bottom
center grate pin. Place left end of left top log
(#5) on top of the left base log. Figure 21
DIS33G Vent Free Gas Fireplace System
23D8020 19
LG929
DIS33G rockwool
LG928
DIS33G right middle log
Right Top
Log #6
Right Top
Log #6
Pins
LG928
Figure 22
6. Place right top log (#6) on two pins
to the left of right base log. Figure 22
After installing logs, place TPB-RW (Rock Wool) in
dime-size pieces evenly across the burner surface in
between the logs. Do not add additional rock wool.
Refer to Figure 23 for the approximate area to place
rock wool.
Wash hands after placing rock wool. Itching may
occur.
Dime-sized Pieces
of Rock Wool
LG929
Figure 23 -
Place Rock Wool
DIS33G Vent Free Gas Fireplace System
20 23D8020
FP2273
pilot bad flame
FP2272
pilot correct flame
In addition, periodically check the ames visually during operation.
It should just touch
the top of the thermocouple tip for natural. Refer to Figure 24 for correct pilot ame.
If the pilot ame does not touch the thermocouple, then the main burner cannot function reliably.
Refer to Figure 25 for incorrect shape of pilot ame.
Figure 24 -
Correct Appearance of Pilot Flame Figure 25 -
Incorrect Appearance of Pilot Flame
Thermocouple
for Natural
Thermocouple
for LP Thermocouple
for LP
Thermocouple
for Natural
FP2272
FP2273
LG930
DIS33G log flames
In normal operation at full rate after 15 minutes, the follow-
ing ame appearances should be observed:
Burner will have a random pattern of yellow ames as
shown in Figure 26. There should be glowing embers on
the front burner. The front ames and embers will
be an opaque orange color during the burn off time.
Glowing
Embers
Figure 26 -
Correct Burner Flame Appearance
LG930
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