MHSC DFX32C Operating instructions

DFX, DBX Vent-Free
Fireplace Systems
Installation & Operating Instructions
Models:
DFX24C, DFX32C, DBX24C
WARNINGS
If the information in this manual is not
followed exactly, a fire or explosion may
result causing property damage, personal
injury or loss of life.
334051
VFS DBX cover
– Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
– WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do
not use any phone in your building.
• Immediately call your gas supplier
from a neighbor's phone. Follow the
gas supplier's instructions.
• If you cannot reach your gas supplier,
call the fire department.
– Installation and service must be
performed by a qualified installer,
service agency or the gas supplier.
This is an unvented gas-fired heater. It uses air
(oxygen) from the room in which it is installed.
Provisions for adequate combustion and
ventilation air must be provided. Refer to Page
7.
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
33D4047 7/11 Rev. 8
CONTENTS
DFX & DBX Series Vent Free Fireplaces
Thank you and congratulations on your purchase of a
Monessen Fireplace.
PLEASE READ THE INSTALLATION AND OPERATION INSTRUCTIONS BEFORE USING THE APPLIANCE!
IMPORTANT: Read all instructions and warnings carefully before starting installation.
Failure to follow these instructions may result in a possible fire hazard and will void the warranty.
DFX24C and DFX32C gas log appliances described in this manual feature the TRIPLE PLAY BURNER
SYSTEM® technology producing a full random yellow flame, full depth ember bed and glowing logs.
Important Safety Information..................................... 3
Code Approval.............................................................. 4
Product Features.......................................................... 5
Gas Pressures........................................................... 5
Gas Specifications..................................................... 5
Ignition Controls........................................................ 5
Pilot........................................................................... 5
Thermal Generator.................................................... 5
Fireplace and Framing Dimensions........................... 6
Preinstallation Information.......................................... 7
What You Will Need................................................... 7
General Fireplace Installation.................................... 7
Installation Information................................................ 8
Fireplace Location..................................................... 8
Clearances................................................................ 9
Fireplace Installation............................................... 10
Secure Heater to Floor or Hearth............................ 11
Connect the Gas......................................................... 12
Checking Gas Pressure............................................. 13
Manual Control........................................................ 13
Thermostat Control.................................................. 13
Millivolt Control........................................................ 13
Electrical Wiring (Millivolt)......................................... 14
Connect Optional Wall Switch................................. 14
Connect Remote Receiver...................................... 15
Check System Operation........................................ 15
Final Installation......................................................... 16
Screen Removal...................................................... 16
Canopy Installation.................................................. 16
Log Placement........................................................ 17
Rock Wool Placement............................................. 18
Flame Appearance...................................................... 19
Pilot Flame.............................................................. 19
Burner Flame Appearance...................................... 20
Operating Instructions............................................... 20
For Your Safety Read Before Lighting..................... 21
Thermostatic Control Lighting Instructions.............. 22
Millivolt Control Lighting Instructions....................... 23
Match Lighting Instructions...................................... 24
Maintenance................................................................ 24
Cleaning and Servicing........................................... 24
Troubleshooting......................................................... 25
Replacement Parts..................................................... 26
Firebox.................................................................... 26
DFX24C Millivolt & Manual Control Burner ............ 27
DFX32C Millivolt Burner.......................................... 28
DBX24C T-Stat Burner............................................ 29
Optional Accessories................................................. 30
Forced Air Kit........................................................... 30
Optional Brick.......................................................... 31
Optional Trim........................................................... 31
Trim Installation....................................................... 32
Warranty...................................................................... 35
33D4047
IMPORTANT SAFETY INFORMATION
DFX & DBX Series Vent Free Fireplaces
OWNER
Please leave these instructions with the appliance.
Please retain these instructions for future reference.
WARNING
INSTALLER
• Any change to this heater or its controls can be dangerous.
• Improper installation or use of the heater can cause serious injury or
death from fire, burns, explosion or carbon monoxide poisoning.
• Do not allow fans to blow directly into the fireplace. Avoid any drafts that
alter burner flame patterns.
• Do not use a blower insert, heat exchanger insert or other accessory,
not approved for use with this heater where applicable.
1. Due to high temperatures, the appliance should be
located out of traffic 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 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 materials,
etc. It is imperative that control compartments,
burners and circulating air passageways be kept
clean.
8. CARBON MONOXIDE POISONING: 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 Z223.l/NFPA54.
10. Do not install the DFX model in a bathroom or bedroom.
The DBX model may be installed in a bedroom, but
not in a bathroom.
11. Correct installation of the ceramic fiber logs, proper
location of the heater, and annual cleaning are necessary to avoid potential problems with sooting. Sooting,
resulting from improper installation or operation, can
settle on surfaces outside the fireplace. Refer to log
placement instructions for proper installation.
33D4047
12. 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.
13. Caution: Candles, incense, oil lamps, etc. produce
combustion byproducts including soot. Vent-free appliances will not filter or clean soot produced by these
types of products. In addition, the smoke and/or aromatics (scents) may be reburnt 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.
14. This is an unvented gas-fired heater. It uses air
(oxygen) from the room in which it is installed. Provisions for adequate combustion and ventilation air must
be provided. Refer to Page 7.
15. 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.
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 appliance.
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.
IMPORTANT SAFETY INFORMATION
DFX & DBX Series Vent Free Fireplaces
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.
20. 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.
21. 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 pressures in excess of 1/2 psig (3.5 kPa).
22. The appliance must be isolated from 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).
23. 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.
24. Never burn solid fuels in a fireplace where a unvented
room heater is installed.
25. 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.
This appliance may be installed in an
aftermarket, permanently located,
manufactured (mobile) home, where not
prohibited by local codes.
This appliance is only for use with the
type of gas indicated on the rating
plate. This appliance is not convertible
for use with other gases.
CODES
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:
American National Standards Institute, Inc.
1430 Broadway
New York, NY 10018
or
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269
33D4047
PRODUCT FEATURES
DFX & DBX Series Vent Free Fireplaces
Gas Specifications
Input BTU/hr
Model
Fuel Control
Max. Min.
DFX24NVC Nat. Millivolt22,000 17,000
DFX24PVC
LP
Millivolt22,000 17,000
DFX32NVC Nat. Millivolt26,00020,000
DFX32PVC
LP
Millivolt26,00020,000
DBX24NTC Nat.
T-Stat
10,000
- DBX24PTC
LP
T-Stat
10,000
--
Fireplace
Screen
Control Knobs
NOTE: For LP models an external regulator is required
to reduce supply pressure to a maximum of 13" w.c.
Piezo Ignition
On/Off Switch
Figure 1 Unvented Gas Heater
(Control Access Door Shown Open)
FP2407
This vent-free fireplace must
be mounted on the floor or
FP2507
on the optional fireplace hearth.
VFS DBX controls
operation
This unvented gas heater requires no outside venting and
burns cleanly with high heating efficiency.
This zero-clearance unvented gas heater can be installed
against (or recessed into) any wall that is accessible to a
gas line.
GAS pressures
Control
Regulator Pressure
Pilot Regulator
Max. Inlet Pressure
Min. Inlet Pressure
Regulator Pressure
Max. Inlet Pressure
Min. Inlet Pressure
33D4047
Fuel
Nat.
Nat.
Nat.
Nat.
LP
LP
LP
T-stat
4.0” w.c.
n/a
10.5” w.c.
5.0” w.c.
10.0” w.c.
13.0” w.c.
11.0” w.c.
Millivolt
3.5” w.c.
3.5” w.c.
10.5” w.c.
5.0” w.c.
10.0” w.c.
13.0” w.c.
11.0” w.c.
ignition controls
Piezo ignitor allows ignition of the pilot without the use of
matches or batteries.
Thermostat control has three (3) positions:
OFF - All gas to the gas logs is shut off at the valve.
IGN - Valve position to light/maintain a standing pilot.
LOW/HI - Variable position corresponding to desired temperature.
Pilot
The gas log heater is fitted with a specially designed safety
pilot light 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.
Thermal Generator
The millivolt gas log pilot is fitted with a millivolt generator
to provide power for remote activation.
FIREPLACE and FRAMING DIMENSIONS
DFX & DBX Series Vent Free Fireplaces
D
L
S
Min. Rough
Opening Depth
R
H
1/2” or 5/8”
S
P
M
O - Min. Rough Opening Width
Q
Min. Rough
Opening
Height
J
G
N
B
E
Figure 2 Fireplace and Framing Dimensions
C
I
F
A
K
Ref.
DFX24C/DBX24C
DFX32C
A24Z\x" (622 mm)
32"
(813 mm)
B22Z\x" (572 mm)28C\v" (730 mm)
C26Z\x" 334051
(673 mm)
30"
(762 mm)
VFS DBX dims
D
14"
(356 mm)21C\v" (553 mm)
E
17"
(432 mm)20Z\v" (514 mm)
F
4B\," (118 mm)
4C\v"
(121 mm)
G
4M\," (124 mm)
5"
(127 mm)
H
11M\," (302 mm)
13C\," (340 mm)
I
1"
(25 mm)
1B\,"
(41 mm)
J
10Z\x" (267 mm)
12"
(305 mm)
K
9"
(229 mm)
10B\," (270 mm)
L
13Z\," (333 mm)
17Z\x" (445 mm)
M21"
(533 mm)27"
(686 mm)
Framing Dimensions
N26C\v" (680 mm)
30Z\v" (768 mm)
O24C\v" (629 mm)
32Z\x" (826 mm)
P
10Z\x" (267 mm)
12Z\v" (311 mm)
Q
42Z\x" (1080 mm)
53C\v" (1326 mm)
R21"
(533 mm)26C\v" (680 mm)
S
30"
(762 mm)
38"
(965 mm)
33D4047
Preinstallation information
DFX & DBX Series Vent Free Fireplaces
GETTING STARTED
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:
• Unvented gas heater
• Trim kit
• Two (2) 90°-angle brackets • Ceramic fiber logs
• Installation/operating instructions
• Canopy and three (3) screws
• Two (2) anchoring screws • Four (4) black screws
Millivolt controlled heater designed to be operated with
optional devices for ON/OFF functions.
• Hand held Remote with receiver
• Wall T-stat with 20' wire
• Wall switch with 20' wire
• Hand held Thermostat Remote w/receiver
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.
What you will need for installation:
You must have the following items available before proceeding with installation:
• External regulator (for propane/LPG only)
• Manual shutoff valve
• Piping which complies with local codes
• Sediment trap
• Phillips head screwdriver
• Tee joint.
• Pipe sealant approved for use with propane/LPG
• Pipe wrench
(Resistant to sulfur compounds)
33D4047
WARNING
the grate only. Do not pick the unit up by
the burners.
• Gloves are recommended when handling
ceramic fiber logs to prevent skin irritation
from loose fibers. Logs are fragile —
handle with care.
Do not install the heater:
• Where curtains, furniture, clothing, or
other flammable objects are less than
42" from the front of the heater.
• In high traffic areas.
• In windy or drafty areas.
In planning the installation for the fireplace it is necessary
to determine where the unit is to be installed and whether
optional accessories are desired. Gas supply piping should
also be planned. The following steps represent the normal
sequence of installation. Each installation is unique, however, and might require a different sequence.
1. Position fireplace in desired location. Refer to the Location of Fireplace and Clearances and Height Requirements, and Firebox Framing sections found in this
manual.
Note: Be sure all packing material has been removed
from underside the unit.
2. Install canopy and logs per instructions found in this
manual. The canopy MUST be installed for safe operation of the unit.
3. Field wire main power supply to units with fan kit. Refer
to the Electrical Section found in this manual. (Electrical
connections should only be performed by an experienced, licensed certified tradesman).
4. Install optional ON/OFF kit on units with millivolt control.
Refer to the installation instructions included with the
kit and also refer to the Electrical Wiring section found
in this manual.
5. Plumb gas line. Refer to the Connecting the Gas section found in this
manual. (Gas connections should only be performed
by an experienced,
licensed/certified tradesman).
6. Complete finish wall material and/or surround.
WARNING
WARNING
• Handle the gas log burner assembly by
If the area in which the heater may be
operated does not meet the required volume
for indoor combustion air, combustion and
ventilation air shall be provided by one
of the methods described in the National
Fuel Gas Code, ANSI Z223.1/NFPA 54, the
International Fuel Gas Code or applicable
local codes.
FIREPLACE INSTALLATION
DFX & DBX Series Vent Free Fireplaces
Fireplace Location
Carefully select the best location for installation of your unvented fireplace. The following factors
should be taken into consideration.
• Clearance to side wall, ceiling, woodwork and window or other combustibles. Refer to “Clearances” section on Page 10. Minimum clearances to combustibles must be maintained.
• Location must not be affected by drafts caused by kitchen exhaust fans, ceiling fans, return
•
•
•
•
•
•
air registers for forced air furnaces / air conditioners, windows or doors.
Installation must provide adequate ventilation and combustion air.
DO NOT INSTALL THESE MODELS IN A BEDROOM OR BATHROOM. Exception: The
DBX may be installed in a bedroom, but not in a bathroom.
Location should be out of high traffic areas and away from furniture and draperies due to
heat from firebox.
Never obstruct the front opening of the unvented fireplace or restrict the flow of combustion
and ventilation air.
Minimize modifications to existing construction. Refer to Figure 3 below for location suggestions.
Do not install in the vicinity where gasoline or other flammable liquids may be stored. The
unvented firebox must be kept clear and free from the combustible materials.
Figure 3 Possible Fireplace Locations
FP2440
FP2440
fireplace locations
33D4047
FIREPLACE INSTALLATION
DFX & DBX Series Vent Free Fireplaces
Ensure that minimum clearances shown in Figures 5 and 6 are maintained. Left and right clearances
are determined when facing the front of the firebox.
Follow these instructions carefully to ensure safe installation. Failure to follow these requirements
may create a fire hazard.
Sidewall Clearances — The clearance from the inside of the appliance to any combustible adjacent
wall should not be less than 9" for the DBX24C/DFX24C and DFX32C. Figure 4
Ceiling Clearance — The ceiling must be at least 42" from the top of the firebox opening. Figure 4
Back Wall Clearance — The appliance may be placed against a combustible back wall.
Floor Clearance — The fireplace may be installed directly on a combustible floor or a raised platform
of an appropriate height. Do not place fireplace on carpeting, vinyl, tile or other soft floor coverings. It
may, however, be placed on flat wood, plywood, particle board or other hard surfaces. Be sure fireplace
rests on a solid continuous floor or platform with appropriate framing for support and so that no cold
air can enter from under the firebox.
Mantel clearances — The canopy supplied with the unit must be installed. If a combustible mantel
is installed. It must meet the clearance requirements detailed in Figure 5.
NOTE: The MHSC Barrington Cabinet Mantel Model series BWC300, BWC400 and BWC500 are
specially designed to comply with all mantel temperature requirements. Any custom-built mantel must
comply with all clearance requirements shown in this instruction manual.
12”
42" Minimum
19”
256O”
9"
Minimum
Figure 4 Sidewall and Ceiling Clearances
9"
Minimum
10”
Canopy
FP2441
FP2508
Figure 5 Mantel Clearances
WARNING
FP2441
sidewall clg clear
The dimensions shown in Figures 4 and 5 are minimum clearances to
maintain in installing this heater. Left and right clearances are determined
when facing the front of the heater.
Follow these instructions carefully to ensure safe installation. Failure
FP2508 to
follow instructions exactly can create a fire hazard.
VFS DBX mantel clearances
33D4047
FIREPLACE INSTALLATION
DFX & DBX Series Vent Free Fireplaces
If unit is to be “built in”, fireplace framing can be built before
or after the appliance is set in place. BE SURE THAT ALL
PACKING MATERIAL HAS BEEN REMOVED FROM THE
UNDERSIDE OF THE UNIT PRIOR TO SETTING THE
FIREBOX IN PLACE. Construct fireplace framing following
Figure 2 on Page 6 for fireplace dimensions. The framing
headers may rest directly on top of the firebox.
The fireplace may be installed directly on a combustible
floor or a raised platform of an appropriate height. Do
not place fireplace on carpeting, vinyl, tile or other soft
floor coverings. It may, however, be placed on flat wood,
plywood, particle board or other hard surfaces. Be sure
fireplace rests on a solid continuous floor or platform with
appropriate framing for support and so that no cold air can
enter from under the firebox.
WARNING
Anchor fireplace to the side framing members using nailing flanges.
The fireplace must be installed giving full
consideration to the clearance and height
requirements identified in this manual.
1. Bend out the nailing flanges located on each side of the
firebox.
2. Slide the firebox into prepared framing or position firebox
in its final position and frame later.
3. Level the firebox by checking the top edge of the firebox.
Shim if necessary.
4. Anchor firebox to the side framing members using 8d
nails or other suitable fasteners. Figure 7
5. The canopy must be installed for safe operation of
the heater. Refer to Page 16 for canopy installation
details.
K
J
FP2445
When finishing a custom cabinet, mantel or other built-in
enclosure, the opening size to accommodate the fireplace with
trim installed is as follows:
Ref. FP2445
DFX24C
DBX24C
J26C\v"26C\v"
opening size
(680 mm)
(680 mm)
K25"25"
(635 mm)
(635 mm)
DFX32C
31Z\v"
(800 mm)
32ZC\zn"
(833 mm)
Figure 6 Custom Cabinet
Nail Sides
Through Nailing
Flanges
FP2509
Figure 7 Nailing Flanges
FP2509
nailing flanges
10
33D4047
FIREPLACE INSTALLATION
DFX & DBX Series Vent Free Fireplaces
SECURING HEATER TO FLOOR OR HEARTH
Note: Clearance requirements as detailed in “Clearances and Height Requirements”
section on Page 15 of this manual, must be met before securing the heater in place.
To prevent movement, the heater must be secured to the floor or hearth.
1. Open the control access door and remove the screen.
2. Remove carton containing the four-log set.
3. To remove the grate and base assembly, take out two (2) screws as shown in Figure 8.
4. Lift grate and base assembly out of the firebox.
5. Secure the firebox with two anchoring screws (3/16" x 1Z\v" length) supplied with the fireplace
system. Figure 9
Note: 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.
Screws
Grate
Anchor Screws
3/16" x 1Z\v"
Figure 8 Remove Grate
FP2515
FP2515
remove grate
33D4047
Figure 9 Secure Heater to Floor or Hearth
FP2516
FP2516
secure base
11
FIREPLACE INSTALLATION
DFX & DBX Series Vent Free Fireplaces
WARNING
NOTICE: A qualified gas appliance installer must connect the heater to the gas supply.
Consult all local codes.
Use new black iron or steel pipe. Internally tinned copper or copper
tubing can be used per National Fuel Code, section 2.6.3, providing gas
meets hydrogen sulfide limits, and where permitted by local codes. Gas
piping system must be sized to provide minimum inlet pressure (Listed
on Data Plate) at the maximum flow rate (BTU/hr). Undue pressure loss
will occur if the pipe is too small.
A manual shutoff valve must be installed upstream of the appliance.
Union tee and plugged 1/8" NPT pressure tapping point should be
installed upstream of the appliance. Figure 9
A sediment trap should be installed upstream to prevent moisture and
contaminants from passing through the pipe to appliance controls and
burners. Failure to do so could prevent the appliance from operating
reliable. Figure 10
To Fireplace
Pipe Coupling
Pipe
Stainless
Flexible Tube
Locations Pressure Tapping
Point Installation
Gas Supply
Inlet
Figure 10 Gas Connection
Manual Shutoff
Valve
Tee Joint
Sediment
Trap
3” Min.
Pipe Nipple
Cap
FP2447
IMPORTANT: Loosen the pipe adapter on the flex tube before installing to the system
piping.
WARNING
Always use an external regulator for all propane/LPG heaters 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.
12
FP2447
gas connection
Check gas type: The gas supply must be the same as stated on the
heater’s rating plate. If the gas supply is different, DO NOT INSTALL
THE HEATER. Contact your dealer for the correct model.
33D4047
FIREPLACE INSTALLATION
DFX & DBX Series Vent Free Fireplaces
When tightening 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. DO NOT USE AN OPEN FLAME.
Check the gas pressure with the appliance burning and the control set to HIGH.
Do not use open flame to check for gas
leaks.
WARNING
WARNING
Open control access door at bottom front of unit to find valve and regulator referred to below.
Connecting directly to an unregulated
propane/LP tank can cause an
explosion.
Manual Control
Figure 11
The pressure regulator is preset and locked to discourage
tampering. If the pressure is not as specified, replace the
regulator with the correct part from the parts list in this
manual.
Test Points
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.
FP2510
Figure 12 Alternate Test Point Location for
Thermostat control Units
FP2510
thermostat control
NPT Test Plug
Figure 11 Pressure Test Point Location
- Manual Control
FP2499
Thermostat
Control
FP2499
Figure 12
manual valve
Turn captured screw counter clockwise two or three turns
and then place tubing to pressure gauge over test point
(Use test point closest to control knob). After taking pressure reading, be sure and turn captured screw clockwise
firmly to reseal. Do not over torque. Check for gas leaks.
Millivolt Control
Figure 13
The valve regulator controls the burner pressure which
should be checked at the pressure test point.
33D4047
FP2511
Test Port
'A'
Figure 13 Pressure Test Point Location - Millivolt Valve
Turn captured screw counter clockwise two or three turns
and then place tubing to pressure gauge over test point.
(Use test point “A” closest to gas inlet). After taking pressure
reading,
be sure and turn captured screw clockwise firmly
FP2511
to reseal.
Dotest
notpoint
over torque. Check for gas leaks.
millivolt
13
ELECTRICAL INSTALLATION
DFX & DBX Series Vent Free Fireplaces
ODS Pilot
On/Off
Switch
ODS
Pilot
Field Installed Optional
Wall Switch or
Remote Receiver
Valve
On/Off
Switch
Spade
Terminal
TH = 3
TP = 1
TP/TH = 2
WARNING
Figure 14 Wiring Diagram
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation. Verify
proper operation after servicing.
FP2112a
Switch
FP2112a
wiring diagram
8/09
Connecting Optional Wall Switch
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. The color of the wires does not matter.
14
33D4047
ELECTRICAL INSTALLATION
DFX & DBX Series Vent Free Fireplaces
Connect Remote Receiver
THESE INSTRUCTIONS SUPERCEDE THE SECTION
ENTITLED “HEARTH MOUNT” IN THE Millivolt
HAND-HELD REMOTE INSTRUCTIONS SUPPLIED
WITH THE REMOTE.
Figure 15
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 floor of compartment behind
access panel.
4. Attach remote receiver to firebox with Velcro• pads.
Control switch must face forward.
NOTE: Do not place remote in combustion chamber.
Velcro•
SK
YT
EC
H
FIR
OF
F
RE
EP
LA
RE
CE
MO
TE
MO
TE
ON
Remote
Receiver
Velcro•
Figure 15 Install Remote Receiver
FP2512
FP2512
install remote rcvr
Check System Operation
The millivolt system and individual components may be checked with a millivolt meter having
a 0-1000 mV range. Conduct each check shown in chart below by connection 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)
a. If the reading is more than 100 millivolts 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.
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, 325 millivolts minimum. If the minimum millivolt reading is
not obtainable, replace pilot.
Connect Meter
Check
To
Leads to
Test
Test
Terminals
A
Complete2 & 3
System
B
Thermopile
1 & 2
33D4047
Switch or
Thermostat
Contacts
Closed
Meter
Reading
Should Be
Closed
Open
Open
15
FINAL INSTALLATION
WARNING
DFX & DBX Series Vent Free Fireplaces
Do not operate the unit without the screen
frame panel and canopy installed.
REMOVE SCREEN
Canopy
Fireplace
Screen
Figure 16
1. Remove bottom louver.
2. Removing fireplace screen frame panel by pushing
screen frame panel up and out.
NOTE: Fireplace screen must be removed to access log
box and to install canopy.
FP2513
Louvre
Figure 16 Remove Fireplace Screen Panel
FP2513 Screws
remove screen
INSTALL CANOPY
Figure 17
1. Push louvers up and out to remove top louver assembly.
2. Align the black canopy with the holes in the top frame
assembly.
3. Install the three (3) screws (in owner’s manual packaging) which attach the canopy to the top frame assembly.
4. Tighten all screws. Make sure the canopy is level and
secure. Install top louver assembly.
Canopy
FP2514
Figure 17 Install Canopy
FP2514
install canopy
16
33D4047
LOG PLACEMENT
DFX & DBX Series Vent Free Fireplaces
CAUTION
WARNING
Before you begin — This unit is supplied with six (6) ceramic fiber logs. Do not handle
these logs with your bare hands. Always wear gloves to prevent skin irritation from
ceramic fibers. After handling the logs, wash your hands gently with soap and water to
remove any traces of fibers.
The positioning of the logs is critical to the safe and clean operation of
this heater. Sooting and other problems may result if the logs are not
properly and firmly positioned in the appliance. Never add additional
logs or embellishments such as pine cones, vermiculite or rock wool
to the heater. Only use the logs and TPB-RW (rock wool) supplied with
the unit.
Failure to position the parts in accordance with diagrams below or
to use only parts specifically approved for this heater may result in
property damage or personal injury.
DO NOT sprinkle volcanic rock on the logs or around the pilot or the
main burner. This may cause sooting. Only place volcanic rock on the
floor of the fireplace.
During initial operation of the new heater, burning logs will give off a
paper burning smell and orange flames will be present. Simply open
the windows for a few hours to vent the odor.
Right Log #1
DFX24C log placement
Figure 18
Left Log
#2
1. Install the rear log (#3) on back of burner.
2. Install the right log (#1) on burner pins on right side of
burner.
3. Install the left log (#2) on burner pins on left side of
burner.
Rear Log #3
Burner
Pins
Burner
Pins
Figure 18 DFX24C Log Placement
33D4047
LG699
17
LG699
24VFSC logs
LOG PLACEMENT
DFX & DBX Series Vent Free Fireplaces
Rear Log
#3
DFX32C Log placement
Figure 19
1. Install front right log (#1) on two pins on right side of
burner.
2. Install left front log (#2) on two pins on left side of
burner.
3. Install back log (#3) on back of burner.
4. Install right middle log (#4) on two pins on burner. Rest
right end of right middle log on the right front log.
5. Install left middle log (#5) on two pins on burner. Rest
left end of left middle log on left front log.
Left Middle
Log #5
Right
Middle
Log #4
Left Front
Log #2
Right Front
Log #1
Pins
Pins
Figure 19 DFX32C Log Placement
Pins
LG700
DBX24C Log placement
Install one-piece log on two burner pins. Figure 20
Pins
PlacE rock wool
One-piece Log
DFX24C and DFX32C models
LG700
After installing logs, pull apart dime-size pieces of rock
32VFSC logs
wool. Sprinkle rock wool evenly over burner ports. Wash
hands after installing rock wool.
Itching may occur.
Burner
Pin
Dime Sized
Rockwool
Pieces
LG701
Burner Pin
Figure 20 24BDXC Log Placement
WARNING
Figure 21 Place Rockwool DFX24C/DFX32C
• Use only rock wool provided with log
set.
• Do not add
additional rock wool.
LG702
• Place rock wool on burner ports only.
VFS DBX rockwool
•Keep air gap between rear log and
burner clean.
33D4047
18
LG701
24BDXC logs
FLAME APPEARANCE
DFX & DBX Series Vent Free Fireplaces
Flames from the pilot, front and rear burner should be visually checked as soon as the
heater is installed. In addition, periodically check the flames visually during operation.
Check the pilot flame
The pilot flame must always be present when the heater is in operation. It should just
touch the top of the thermocouple tip for natural. Refer to Figures 22 & 23 for correct pilot
flame.
If the pilot flame does not touch the thermocouple, then the main burner cannot function
reliably. Refer to Figures 22 & 23 for incorrect shape of pilot flame.
Millivolt Control
Thermocouple
for Natural Gas
Thermocouple
for Natural Gas
Thermocouple
for LP
Thermocouple
for LP
FP2273
FP2272
Correct Pilot Flame Appearance
Incorrect Pilot Flame Appearance
Figure 22 Millivolt Control Pilot Flame Appearance
HI/LO CONTROL
FP2272
pilot correct flame
Thermocouple
for Natural Gas
Thermocouple
for Natural Gas
Thermocouple
for LP
FP2273
pilot bad flame
Thermocouple
for LP
FP2502
Correct Pilot Flame Appearance
Incorrect Pilot Flame Appearance
Figure 23 Hi/Lo Control Pilot Flame Appearance
33D4047
FP2501
manual pilot flame
19
FLAME APPEARANCE
DFX & DBX Series Vent Free Fireplaces
Checking burner flame
DFX24C and DFX32C models
In normal operation at full rate after 15 minutes, the following flame appearances should be observed:
Burner will have a random pattern of yellow flames. Figures 24 and 25. There should be glowing embers in front
of burner.
DBX24C model
In normal operation at full rate after 15 minutes, the following flame appearances should be observed:
The flames inside the one-piece log may be yellow. The
flames should extend approximately 2" - 4" above the log.
Figure 26
NOTE: The front flames and embers will be an opaque
orange color during the burn off time.
Figure 24 DFX24C Log Flame Appearance
LG703
LG703
24VFSC log flames
2” - 4”
Figure 25 DFX32C Log Flame Appearance
LG704
Figure 26 DBX24C Log Flame Appearance
LG705
OPERATING INSTRUCTIONS
LG704
Avoid any drafts that alter burner flame patterns. Do not allow fans to blow directly into
32VFSCDolog
the fireplace.
not flames
place a blower inside the burn area of the firebox. Ceiling fans
may
LG705
create drafts that alter flame patterns. Sooting and improper burning will result. 24DBXC log flames
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.
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 will be slight and will disappear with
continued use.
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.
20
33D4047
OPERATING INSTRUCTIONS
DFX & DBX Series Vent Free Fireplaces
WARNING
for your safety read before lightinG
If you do not follow these instruction
exactly, a fire or explosion may result
causing property damage, personal injury
or loss of life.
A. This appliance is equipped with a piezo ignition device which automatically lights the pilot. If piezo
is not working properly, refer to Match Lighting Instructions, Page 24.
B. BEFORE OPERATING smell all around the appliance area for gas. Be sure to smell next to the floor
because some gas is heavier than air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS:
• Do not attempt to light any appliance.
• Do not touch any electric switch; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor's phone. Follow the gas supplier's instructions.
• If you cannot reach your gas supplier, call the fire department.
C. Use only your hand to push in, or turn the gas control knob. Never use tools. If the knob will not
push in or turn by hand, don't try to repair it. Call a qualified service technician. Force or attempted
repair may result in a fire or explosion.
D. Do not use this appliance if any part of it has been under water. Immediately call a qualified service
technician to inspect the appliance and to replace any part of the control system and any gas control
that has been under water.
Control Knobs
Piezo Ignitor
On/Off Switch
DFXC/DBXC Controls
33D4047
FP2507
VFS DBX controls
FP2407
21
DFX & DBX Series Vent Free Fireplaces
OPERATING INSTRUCTIONS
thermostatIC control lighting instructions
1.
2.
3.
4.
5.
6.
7.
8.
9.
STOP! Read the safety information .
Make sure the manual shutoff valve is fully open.
This heater is equipped with an ignition device (piezo) which automatically lights the pilot.
Refer to Page 21 for the location of the piezo ignitor and control knob. Turn control knob clockwise
to the OFF position.
Wait 5 minutes to clear out any gas. Then smell for gas, including near the floor. If you smell gas, STOP!
Follow safety instructions under What To do if You Smell Gas, Page 21. If you do not smell gas, go to
the next step.
Turn the gas control knob counterclockwise
to the IGN position. Push in and hold control knob
for 5 seconds.
With the control knob pushed in and held, push and release the piezo ignitor button to light the ODS
pilot. The pilot is located on the right side of the heater, behind the front log and in front of the burner.
If piezo ignitor does not light the pilot, see Match Lighting Instructions, Page 24.
Hold the control knob in for an additional 10 seconds to prevent the ODS pilot from shutting off the gas
while the thermocouple is warming up.
Release the control knob.
• If the knob does not pop out when released, stop and immediately call your service technician or
gas supplier.
• If the ODS pilot will not stay lit after several tries, push and turn the control knob clockwise
to OFF. Release and wait 15 seconds. Repeat steps 6 through 9.
10.Turn control knob to any position between LOW and HIGH. The knob position controls the thermostat
temperature.
11.The heater is now in proper operation. The following procedure should be used to achieve thermostatic
control of the desired room temperature.
Control Knob
a. Operate unit at higher setting until desired room temperature is
achieved.
b. At the desired temperature, slowly turn the knob clockwise and stop
rotating when flame disappears.
c. Thermostat is now set to maintain the current room temperature.
d. As the room temperature decreases, the thermostat valve will open to
ignite the front and rear burner.
e. When the temperature reaches its set point (knob position), the thermostat valve will again shut off the burner.
f. This is the normal cycle of the heater.
TO TURN OFF GAS TO HEATER
FP2576
rotate
control
knob
1. Turn control knob clockwise
to OFF position to completely shut off the heater.
2. If applicable: Turn off all electric power to the heater.
22
33D4047
OPERATING INSTRUCTIONS
DFX & DBX Series Vent Free Fireplaces
Millivolt control lighting instructions
1. STOP! Read the safety information label.
2. Make sure the manual shutoff valve is fully open.
3. This gas log set is equipped with an ignition device (piezo) which automatically lights the pilot. If piezo
ignitor does not light the pilot, refer to instructions for Match Lighting Instructions, Page 24.
4. Turn gas control knob clockwise
to the OFF position, set thermostat to lowest setting and turn ON/OFF
switch to OFF position.
5. Wait (5) minutes to clear out any gas. Then smell for gas, including near the floor. If you smell gas,
STOP! Follow What to Do if You Smell Gas, Page 21. If you don't smell gas, go to next step.
6. From OFF position, turn the gas control knob counterclockwise
to IGN position. Push in control
knob for 5 seconds. NOTE: If you are running the heater for the first time, it will be necessary to
press in the control knob for 30 seconds to allow air to bleed out of the gas piping.
7. With the control knob pushed in, push in and release the piezo ignitor button to light the pilot.
8. Continue pushing the control knob in for a further 60 seconds to prevent the flame detector from shutting off the gas while the probe is warming up. Release the control knob.
9. Turn gas control knob counterclockwise
to the ON position.
10.After the pilot has been lit for one minute, the burners can be turned on. Turn the ON/OFF switch to
ON position or adjust thermostat to desired setting.
11.If the gas logs will not operate, follow the instructions To Turn Off Gas To Heater below and call your
service technician or gas supplier.
FP2275
Pilot
Control Knobs
FP2518
FP2518
control knob
FP2519
Piezo
FP2519
piezo
TO TURN OFF GAS TO HEATER
1. Turn control knob clockwise
to OFF position to completely shut off the heater.
2. If applicable: Turn ON/OFF switch to OFF position and/or set thermostat (if present) to lowest setting.
3. If applicable: Turn off all electric power to the heater.
33D4047
23
DFX & DBX Series Vent Free Fireplaces
OPERATING INSTRUCTIONS and MAINTENANCE
MATCH lighting instructions
1. Remove any items necessary for easy access to the pilot (for example: logs, screens, etc.).
2. Follow appropriate lighting instructions found previously. Instead of pushing and releasing the piezo
button, light a match and hold the flame to the end of the pilot and ignite the pilot.
3. After control knob has been released and pilot stays lit, reinstall any items that were removed for pilot
access.
4. Call a qualified service technician for repair or replacement of the piezo ignitor.
CLEANING AND SERVICING
Annual inspection and cleaning by your dealer or qualified service technician is recommended to
prevent malfunction and/or sooting.
Remove fireplace screen. Carefully lower screen from mounting lugs and set aside during cleaning. See instruction manual for installation of screen. DO NOT OPERATE THE UNIT WITH THE
SCREEN REMOVED.
Remove logs, handling carefully by holding gently at each end. Gloves are recommended to prevent
skin irritation from ceramic fibers. If skin becomes irritated, wash gently with soap and water. See
manual for correct log placement.
Periodic Cleaning - Refer to the parts diagram for location of items discussed below.
• Do not use cleaning fluid to clean logs or any part of heater.
• Brush logs with soft bristle brush or vacuum with brush attachment.
• Vacuum loose particles and dust from the front and rear burner, control and piezo covers and
grate weldment.
• Inspect and clean burner. Remove lint or particles with vacuum, brush or pipe cleaners.
• External case should be dusted and wiped with a wet soapy cloth.
Annual Cleaning/Inspection - Refer to the parts diagram for location of items
discussed below.
•
•
•
•
24
Inspect and clean all burner ports.
Inspect ODS pilot for operation and accumulation of lint at air intake holes.
Verify flame pattern and log placement for proper operation.
Verify smooth and responsive ignition of burner.
33D4047
WARNING
TROUBLESHOOTING
DFX & DBX Series Vent Free Fireplaces
If the gas quality is bad, your pilot may not stay lit, the burners may
produce soot and the heater may backfire when lit. If the gas quality
or pressure is low, contact your local gas supplier immediately.
REMEDY
OBSERVED PROBLEM
POSSIBLE CAUSE
ODS/pilot lights, but flame
goes out when control knob is
released.
1. Control knob not fully pressed in.
2. Control knob not pressed in long
enough.
3. Manual shutoff valve not fully open.
4. Thermocouple connection loose at control
valve.
Burner does not light after ODS/
pilot is lit.
1. Burner orifice is clogged.
2. Burner orifice diameter is too small.
3. Inlet gas pressure is too low.
1. Clean orifice.
2. Replace burner orifice.
3. Contact qualified service person.
Burner backfires during combustion.
1. Manifold pressure is too low.
2. Burner orifice is clogged.
Slight smoke or odor during
initial operation.
1. Burner orifice is clogged or damaged.
2. Burner is damaged.
3. Gas regulator defective.
1. Contact local gas company.
2. Clean burner or replace burner orifice.
1. Clean burner or replace burner orifice.
2. Replace burner.
3. Replace gas regulator.
Logs appear to smoke after
initial operation.
1. Vapors from paint or curing process of logs.
Heater produces a whistling
noise when burner is lit.
1. Turning control knob to HIGH position 1. Turn control knob to LOW position
and let warm up for a minute.
when burner is cold.
2. Operate burner until air is removed
2. Air in gas line.
from line. Have gas line checked by
local gas company.
3. Clean burner or replace burner ori3. Dirty or partially clogged burner orifices.
fice.
No gas to pilot.
1. LP-regulator shut down due to inlet pres- 1. Verify LP tank regulator is installed
and set at 11" to 13" w.c.
sure too high.
2. Replace regulator on heater.
33D4047
1. Press in control knob fully.
2. After ODS/pilot lights, keep control
knob pressed in for 30 seconds.
3. Fully open manual shutoff valve.
4. Hand tighten thermocouple connection until snug, then tighten 1/4 turn
more.
5. Pilot flame not touching thermocouple, 5a.Contact local gas company.
which allows thermocouple to cool, caus- 5b.Clean pilot with vacuum cleaner.
ing pilot flame to go out. This problem could
be caused by either low gas pressure, or a
dirty or partially clogged ODS/pilot.
6. Replace thermocouple.
6. Thermocouple damaged.
7. Replace control valve.
7. Control valve damaged.
1. Problem will stop after a few hours
of operation. Run the heater with
the damper open if you have one,
or open a window for the first few
hours.
2. Vapors or smoke continue after heater 2. Log heater is intended to be smokeless. Turn OFF heater and call qualihas run with damper or window open for
fied service person.
several hours.
25
REPLACEMENT PARTS
DFX & DBX Series Vent Free Fireplaces
1
3
4
5 2
6
DFXC/DBXC Firebox Parts
Description
Canopy
Screen Assy.
Left Firebrick (Optional)
Center Firebirck (Optional)
Right Firebrick (Optional)
Blower (Optional)
WARNING
Ref.
1.
2.
3.
4.
5.
6.
26
334051
Qty.
DBX24C
DFX32C
firebox partsDFX24C
1
33D4000
33D4000
33D5000
1
33D4501
33D4501
33D5501
126D706126D706126D7065
126D706026D706026D7064
126D706226D706226D7066
1
BLO24T
BLO24TB
BLOT
Failure to position the parts in accordance with these diagrams or
failure to use only parts specifically approved with this appliance may
result in property damage or personal injury.
33D4047
REPLACEMENT PARTS
DFX & DBX Series Vent Free Fireplaces
1
3
10
12
11
2
5
6
9
6
9
7
6
8
4
DFX24C Millivolt Control Burner Parts
Ref.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
Description
Burner/Grate Assy.
Injector
Venturi
Millivolt Valve
Burner to Valve Tube
ODS Pilot Valve Tube, 3/16
Piezo Ignitor
Piezo Wire
ODS Pilot Assy.
Left Log #1
Right Log #2
Rear Log #3
Tube Nut, 5/16 (not shown)
Tube Ferrule, 5/16 (not shown)
Flex Tube w/Fittings (not shown)
8 Grams Rock Wool Bag (not shown)
DFX24C Millivolt
Qty. 334051
Natural
Propane
1 24VFSC burner parts
33D4043
33D4043
1
59D0062
33D4046
1
58D0454
33D4058
1
14D0467
14D0468
1
33D4511
33D4511
1
49D0050
49D0050
1
14D0503
14D0503
1
00K0632
00K0632
1
14D0473
14D0477
1
33D4040
33D4040
1
33D4041
33D4041
1
33D4039
33D4039
1
00K0917
00K0917
1
00K0918
00K0918
120H002220H0022
1
58D0443
58D0443
334051
24VFSC burner parts
33D4047
27
REPLACEMENT PARTS
DFX & DBX Series Vent Free Fireplaces
14
1
3
15
16
10
11
2
9
4
4
7
9
13
12
8
10
6
5
DFX32C Millivolt Burner Parts
DFX32C Millivolt
Description
Qty.
Natural
Propane
Burner/Grate Assy.
1
33D5050
33D5050
Injector
1
33D5040
33D5039
Venturi
1
58D0454
33D4058
334051 1
ODS Pilot Assy.
14D0473
14D0477
32VFSC burner parts
Millivolt Valve
1
14D0467
14D0468
Pressure Regulator
1
14D0469
-Burner to Valve Tube
1
33D5511
33D5511
Tube Fitting 3/8 x 5/16
1
11V0313
11V0313
ODS Pilot Valve Tube, 3/16
1
49D0050
49D0050
Piezo Ignitor
1
14D0503
14D0503
Piezo Wire
1
00K0632
00K0632
Right Front Log #1
1
33D5042
33D5042
Left Front Log #2
1
33D5043
33D5043
Rear Log #3
1
33D5044
33D5044
Right Middle Log #4
1
33D5045
33D5045
Left Middle Log #5
1
33D5046
33D5046
Tube Nut, 5/16 (not shown)
1
00K0917
00K0917
Tube Ferrule, 5/16 (not shown)
1
00K0918
00K0918
Flex Tube w/Fittings (not shown)
120H002220H0022
17 Grams Rock Wool Bag (not shown)
1
70D0039
70D0039
WARNING
Ref.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
28
Failure to position the parts in accordance with these diagrams or
failure to use only parts specifically approved with this appliance may
result in property damage or personal injury.
33D4047
REPLACEMENT PARTS
2
DFX & DBX Series Vent Free Fireplaces
8
1
9
7
10
3
4
6
5
DBX24C T-STAT Burner Parts
Ref.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
DBX24C T-Stat
Description
Qty.
Natural
Propane
Burner
1
33D0070
33D0071
334051
Injector
1
18D0523
33D0281
ODS Pilot Valve Tube, 3/16
1
49D0050
49D0050
24DBXC burner parts
ODS Pilot Assy.
126D2529
14D0476
T-Stat Control Valve
1
11V0701
11V0701
Pressure Valve Regulator
124D030524D0306
Piezo Wire
1
00K0632
00K0632
Burner Valve Tube, 1/4
1
33D4053
33D4053
Piezo Ignitor
1
18D0402
18D0402
Front Log #1
1
33D0066
33D0066
Tube Nut, 1/4 (not shown)
1
00F0079
00F0079
Tube Ferrule, 1/4 (not shown)
1
00F0080
00F0080
NPT Tube Fitting, 3/8 x 1/2 (not shown)
1
18D0310
18D0310
Flex Tube w/Fittings (not shown)
120H002220H0022
Modulating Screw (Min. Flow) (not shown) 1
972057
972057
NPT Tube Fitting, 3/8 x 1/4 (not shown)
1
11V0312
11V0312
33D4047
29
DFX & DBX Series Vent Free Fireplaces
OPTIONAL ACCESSORIES
Forced Air Kit
If you are installing the forced air kit (Models BLO24-T, BLO24-TB or BLOT), see the installation
instructions provided with the kit for electrical wiring requirements or the blower installation section.
Model DFX24C uses blower model BLO24T.
Model DFX32C uses blower model BLOT.
Model DBX24C uses blower model BLO24TB.
The firebox must be connected to main power supply at time of firebox installation. The blower must
be installed prior to the installation of the unvented heater. The electrical connections must be made
before the firebox is framed and enclosed in the finished walls.
Brass Louvers
Optional brass louvers may be installed in place of the factory installed black louvers. See installation instructions provided with the brass louvers.
Firebricks
CAUTION
Optional firebrick kits can be installed. See installation instructions provided with kit or Page 32.
30
Electrical connections should only be performed by a qualified, licensed
electrician, main power must be off when connecting to main electrical
power supply or performing service.
33D4047
OPTIONAL ACCESSORIES
DFX & DBX Series Vent Free Fireplaces
install optional FIREbrick panels
1. Remove optional firebrick panels from packaging. Check
that you have the following:
• 3 firebrick panels
• two (2) retainer brackets
• two (2) black screws
If any part or parts are missing, contact dealer where
you bought fireplace.
2. Turn off fireplace and allow to cool.
3. Remove fireplace screen, Page 16, Figure 16 and
logs.
4. Place rear firebrick panel on back wall of firebox. Set
bottom of panel behind the bracket tabs of the grate.
Figure 35
5. Place one of the side firebrick panels in cabinet. Line
up the hole in the retainer clip with the hole inside the
firebox. Using Phillips screwdriver, attach the retainer
bracket to inside of firebox. Figure 36
6. Repeat step five for the other firebrick side panel.
Hole
Retainer
Clip
Side Firebrick
Panel
Screw
Figure 35 Install Side Firebrick Panel
FP2521
black TRIM INSTALLATION
DFX24C/DBX24C
FP2521
1. Remove black trim
from protective
install
side brickpackaging. Remove
Rear Firebrick
Panel
four (4) black screws and two (2) 90° angle trim brackets
from owner’s manual packaging.
2. Lay trim on floor and match corners of side trims to top
trim. Figure 37
Bracket Tabs
Figure 36 Install Back Firebrick Panel
FP2520
FP2522
FP2520
install back brick
Figure 37 Match and Join Corners of
Black Trim with Trim Brackets
FP2522
attach trim brackets
To Separate Trim
FP2523
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31
FP2523
seaparate trim
OPTIONAL ACCESSORIES
DFX & DBX Series Vent Free Fireplaces
3. Use one 90° angle trim bracket to join the corner of
one piece of side trim to the corner of the top trim
piece. Figure 37. A rubber hammer or handle of a claw
hammer will help secure the corners.
4. Repeat for other side.
NOTE: If you do not attach the trim at the correct
corners, use a hammer and screwdriver to tap on the
one end of the 90° angle bracket. This will separate the
two pieces of trim. Figure 38
5. Place assembled black trim on front of heater. Using four
(4) black screws, secure black trim to sides of heater.
Figure 38
45° Angled
Corners
Back of Trim
Assembly
FP2525
Figure 39 Align Corners of Trim Pieces
FP2525
mitered corners
Bracket
Bracket
Screws
Outside
Corner Slot
Shim
FP2524
Black Trim
Holes for Black
Screws
Black Screw
Figure 38 Attach Assembled Trim to Fireplace
Black trim installation
DFX32C
FP2524
1. Remove trim from
protective
attach
trim packaging. Be careful not
to scratch the trim. Remove two (2) 90° angled mounting
brackets and two (2) 90° angled shims.
2. Lay trim face down on the floor. Line up the 45°-angled
corners of the top trim with the 45°-angled corners of
the side trims.
Note: Both ends of the top piece of trim are mitered.
Figure 39
3. Slide one (1) 90° angled bracket (with attached screws)
and one (1) 90° angled shim in the outside corner slot
where the top and side trims meet. Figure 40
32
Figure 40 Secure Corners
No Spaces
Where Corners
Join
Ensure Corners
are Flush
FP2526
4. Hold the corners together securely. Tighten screws on
FP2526
bracket with flat head screwdriver. Make sure the corsecure
corners
ners are flush
and there
are no spaces. Do not over
tighten screws. Figure 40
5. Repeat for other side trim.
6. Slide assembled trim over the top and down the sides of
the fireplace. Flush trim with front of fireplace as shown
in Figure 41.
7. Align holes in assembled trim with holes in side of fireplace. Using a Phillips screwdriver, attach trim with four
(4) screws provided — two for each side of fireplace.
Tighten snuggly. Figure 42
33D4047
OPTIONAL ACCESSORIES
DFX & DBX Series Vent Free Fireplaces
Assembled Trim
Trim Flush with
Front of Fireplace
Figure 41 Slide Assembled Trim Over Top of Heater
FP2527
FP2527
install trim
Screws
Screw
Holes
Screw
Figure 42 Secure Trim to Fireplace
FP2528
33D4047
33
FP2528
secure trim
DFX & DBX Series Vent Free Fireplaces
34
33D4047
DFX & DBX Series Vent Free Fireplaces
LIMITED LIFETIME WARRANTY POLICY
Lifetime Warranty
The following components are warranted for life to the original owner, subject to proof of purchase:
Firebox, Combustion Chamber, Heat Exchanger, Grate and Stainless Steel Burners.
Five Year Warranty
The following components are warranted for 5 years to the original owner, subject of proof of purchase: Ceramic Fiber Logs, Catalytic Filter and Aluminized Burners.
Basic Warranty
MHSC warrants the components and materials in your gas appliance to be free from manufacturing and material defects for a period of one year from date of installation. After installation, if any of
the components manufactured by MHSC in the appliance are found to be defective in materials or
workmanship, MHSC will, at its option, replace or repair the defective components at no charge to
the original owner. MHSC will also pay for reasonable labor costs incurred in replacing or repairing
such components for a period of one year from the date of installation. Any products presented for
warranty repair must be accompanied by a dated proof of purchase.
This Limited Warranty will be void if the appliance is not installed by a qualified installer in accordance
with the installation instructions. The Limited Lifetime Warranty will also be void if the appliance is
not operated and maintained according to the operating instructions supplied with the appliance, and
does not extend to (1) firebox/burner assembly damage by accident, neglect, misuse, abuse, alteration, negligence of others, including the installation thereof by unqualified installers, (2) the costs of
removal, reinstallation or transportation of defective parts on the appliance, or (3) incidental or consequential damage. All service work must be performed by an authorized service representative.
This warranty is expressly in lieu of other warranties, express or implied, including the warranty of
merchantability of fitness for purpose and of all other obligations or liabilities. MHSC does not assume
for it any other obligations or liability in connection with the sale or use of the appliance. In states that
do not allow limitations on how long an implied warranty lasts, or do not allow exclusion of indirect
damages, those limitations of exclusions may not apply to you. You may also have additional rights
not covered in this Limited Warranty.
MHSC reserves the right to investigate any and all claims against the Limited Warranty and decide
upon method of settlement.
IF WARRANTY SERVICE IS NEEDED...
1. Contact your supplier. Make sure you have your warranty, your sales receipt and the model/
serial number of your MHSC product.
2. DO NOT ATTEMPT TO DO ANY SERVICE WORK YOURSELF.
33D4047
35
MHSC
149 Cleveland Drive • Paris, Kentucky 40361
www.mhsc.com