Vermont Castings DFS3224A User manual

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 10.
READ AND SAVE THESE INSTRUCTIONS
VENT-FREE FIREPLACE SYSTEMS
INSTALLATION AND OPERATING INSTRUCTIONS
MODELS:
DFS3224A
DFS32A
DFS36A
DFS42A
Manual, Milli-Volt,
Hi/Lo Remote Control
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.
– Do not store or use gasoline or other fl ammable
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
fi re department.
– Installation and service must be performed by
a qualifi ed installer, service agency or the gas
supplier.
WARNINGS
WARNINGS
WARNINGS

2
26D3310
CONTENTS
Important Safety Information
................................
3
Product Features
.....................................................
5
Operation
..............................................................
5
Specifi cations
..........................................................
7
Ignition Controls
....................................................
8
Pilot
.......................................................................
7
Thermal Generator
................................................
Thermal Generator ................................................ Thermal Generator
7
Getting Started
.........................................................
8
General Installation Information
............................
9
Firebox Dimensions
..............................................
9
Codes
..................................................................
10
Adequate Combustion and Ventilation Air
..........
Adequate Combustion and Ventilation Air .......... Adequate Combustion and Ventilation Air
10
Removing Screen
...............................................
12
Installing Canopy
................................................
12
Securing Heater to Floor or Hearth
.....................
13
Installing Radiant Face Plates
............................
13
Location of Fireplace
............................................
14
Clearances and Height Requirements
.................
15
Fireplace Framing
.................................................
16
Connecting the Gas
...............................................
18
Checking Gas Pressure
........................................
19
Manual Control
....................................................
19
Hi/Lo Remote Control
.........................................
19
Milli-Volt Control
..................................................
19
Electrical Wiring (Milli-Volt)
..................................
20
Connecting Optional Wall Switch or Thermostat
.
20
Connecting Remote Receiver
.............................
Connecting Remote Receiver ............................. Connecting Remote Receiver
21
Checking System Operation
...............................
21
Log Placement
.......................................................
22
Flame Appearance
.................................................
23
Checking the Burner Flame
.................................
24
Operating Instructions
..........................................
24
For Your Safety Read Before Lighting
................
25
Manual Control Lighting Instructions
..................
26
Hi/Lo Control Lighting Instructions
......................
27
Milli-Volt Control Lighting Instructions
.................
28
Match Lighting Instructions
.................................
29
Cleaning and Servicing
.........................................
29
Blower and Other Optional Equipment
...............
30
Illustrated Parts Breakdown
.................................
31
Logs
....................................................................
31
Heater
.................................................................
Heater ................................................................. Heater
32
Cabinet
................................................................
33
Troubleshooting
....................................................
36
Warranty
.................................................
Back Cover

26D3310
3
10. This unit complies with ANSI Z21.11.2-2001
Unvented
Heaters.
11. Do not install the heaters in a bathroom or bedroom.
12. Correct installation of the ceramic fi ber 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 fi replace. See log
placement instructions for proper installation.
13. Avoid any drafts that alter burner fl ame patterns. Do not
allow fans to blow directly into fi replace. Do not place
a blower inside burn area of fi rebox. Ceiling fans may
create drafts that alter burner fl ame patterns. Sooting
and improper burning will occur.
14.
Caution:
Candles, incense, oil lamps, etc. produce
combustion byproducts including soot. Vent-free
appliances will not fi lter 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.
15. This is an unvented gas-fi red heater. It uses air (oxygen)
from the room in which it is installed. Provisions
for adequate combustion and ventilation air must be
provided. See page 10.
16. Keep room area clear and free from combustible
materials, gasoline and other fl ammable vapors and
liquids.
INSTALLER
Please leave these instructions with the owner.
OWNER
Please retain these instructions for future reference
.
IMPORTANT
Read these instructions carefully before installing or trying to operate this vent-free gas heater.
IMPORTANT SAFETY INFORMATION
1. Due to high temperatures, the appliance should
be located out of traffi c 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 fl 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 qualifi ed
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.
1. Due to high temperatures, the appliance should
2. Children and adults should be alerted to the hazard
3. Young children should be carefully supervised when
4. Do not place clothing or other fl ammable material
5. Any safety screen or guard removed for servicing
6. Installation and repair should be done by a qualifi ed
7. To prevent malfunction and/or sooting, an unvented
8.
CARBON MONOXIDE POISONING:
Early signs of
carbon monoxide poisoning are similar to the fl 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
National Fuel Gas
Code, ANSI Z223.l/NFPA54.
Continued on page 4
• Any c
hange to this heater or its controls can be dangerous.
• Improper installation or use of the heater can cause serious injury or death from fi re,
burns, explosion or carbon monoxide poisoning.
• Do not allow fans to blow directly into the fi replace. Avoid any drafts that alter
burner fl ame patterns.
• Do not use a blower insert, heat exchanger insert or other accessory, not approved
for use with this heater where applicable.
WARNING

4
26D3310
IMPORTANT SAFETY INFORMATION
THIS APPLIANCE MAY BE
INSTALLED IN AN AFTERMAR-
KET, PERMANENTLY LOCATED,
MANUFACTURED (MOBILE)
HOME, WHERE NOT PROHIB-
ITED 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.
Continued from page 3
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, fi 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.
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 qualifi ed 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 fi replace 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.

26D3310
5
PRODUCT FEATURES
Figure 1 - Unvented Gas Heater with Control Access Door Open
This vent-free fi replace must be mounted on the fl oor or on the optional fi replace hearth.
OPERATION
This unvented gas heater requires no outside venting and burns cleanly with high heating effi ciency.
This zero-clearance unvented gas heater can be installed against (or recessed into) any wall that is accessible to
a gas line.
Screen
Control
Knobs
On/Off Switch
Piezo
Optional
T-Stat Sensor

6
26D3310
NATURAL GAS
Manual Pressure Milli-Volt and T-Stat Pressure Hi/Lo Pressure
Regulator Pressure: Setting: 3.0" w.c. Regulator Pressure Setting: 3.5" w.c. Regulator Pressure Setting: 3.5" w.c.
Pilot Regulator: 3.5" w.c. Pilot Regulator: 3.5" w.c.
Gas Inlet Pressure: Max. 10 1/2" w. c. Gas Inlet Pressure: Max. 10 1/2" w. c. Gas Inlet Pressure: Max. 11" w.c.
Min. 5" w.c. Min. 5" w.c. Min. 6" w.c.
PRODUCT FEATURES
PROPANE/LPG
Note: An external regulator is required to reduce supply pressure to a maximum of 13" w.c.
Manual Pressure Milli-Volt and T-Stat Pressure Hi/Lo Pressure
Regulator Pressure Setting: 10" w.c. Regulator Pressure Setting: 10" w.c. Regulator Pressure Setting: 10" w.c.
Gas Inlet Pressure: Max. 13" w.c. Gas Inlet Pressure: Max. 13" w.c. Gas Inlet Pressure: Max. 13: w.c.
Min. 11" w.c. Min. 11" w.c. Min. 12" w.c.
Gas Rate
Model Number Control Max BTU/Hr Min BTU/Hr
DFS32NMA MANUAL 28,000 18,000
DFS32NVA MILLI-VOLT 28,000 18,000
DFS32NTA T-STAT 28,000 18,000
DFS32NHA HI/LO REMOTE 28,000 18,000
DFS3224NMA MANUAL 38,000 20,000
DFS3224NVA MILLI-VOLT 38,000 25,000
DFS3224NTA T-STAT 38,000 25,000
DFS3224NHA HI/LO REMOTE 38,000 20,000
DFS36NMA MANUAL 38,000 20,000
DFS36NVA MILLI-VOLT 38,000 25,000
DFS36NTA T-STAT 38,000 25,000
DFS36NHA HI/LO REMOTE 38,000 20,000
DFS42NMA MANUAL 38,000 20,000
DFS42NVA MILLI-VOLT 38,000 25,000
DFS42NTA T-STAT 38,000 25,000
DFS42NHA HI/LO REMOTE 38,000 20,000
Gas Rate
Gas Rate
Model Number Control Max BTU/Hr Min BTU/Hr
DFS32NMA MANUAL 28,000 18,000
DFS32NVA MILLI-VOLT 28,000 18,000
DFS32NTA T-STAT 28,000 18,000
DFS32NHA HI/LO REMOTE 28,000 18,000
DFS3224NMA MANUAL 38,000 20,000
DFS3224NVA MILLI-VOLT 38,000 25,000
DFS3224NTA T-STAT 38,000 25,000
DFS3224NHA HI/LO REMOTE 38,000 20,000
DFS36NMA MANUAL 38,000 20,000
DFS36NVA MILLI-VOLT 38,000 25,000
DFS36NTA T-STAT 38,000 25,000
DFS36NHA HI/LO REMOTE 38,000 20,000
DFS42NMA MANUAL 38,000 20,000
DFS42NVA MILLI-VOLT 38,000 25,000
DFS42NTA T-STAT 38,000 25,000
DFS42NHA HI/LO REMOTE 38,000 20,000
Gas Rate
Model Number Control Max BTU/Hr Min BTU/Hr
DFS32NMA MANUAL 28,000 18,000
DFS32NVA MILLI-VOLT 28,000 18,000
DFS32NTA T-STAT 28,000 18,000
DFS32NHA HI/LO REMOTE 28,000 18,000
DFS3224NMA MANUAL 38,000 20,000
DFS3224NVA MILLI-VOLT 38,000 25,000
DFS3224NTA T-STAT 38,000 25,000
DFS3224NHA HI/LO REMOTE 38,000 20,000
DFS36NMA MANUAL 38,000 20,000
DFS36NVA MILLI-VOLT 38,000 25,000
DFS36NTA T-STAT 38,000 25,000
DFS36NHA HI/LO REMOTE 38,000 20,000
DFS42NMA MANUAL 38,000 20,000
DFS42NVA MILLI-VOLT 38,000 25,000
DFS42NTA T-STAT 38,000 25,000
DFS42NHA HI/LO REMOTE 38,000 20,000
Model Number Control Max BTU/Hr Min BTU/Hr
DFS32NMA MANUAL 28,000 18,000
DFS32NVA MILLI-VOLT 28,000 18,000
DFS32NTA T-STAT 28,000 18,000
DFS32NHA HI/LO REMOTE 28,000 18,000
DFS3224NMA MANUAL 38,000 20,000
DFS3224NVA MILLI-VOLT 38,000 25,000
DFS3224NTA T-STAT 38,000 25,000
DFS3224NHA HI/LO REMOTE 38,000 20,000
DFS36NMA MANUAL 38,000 20,000
DFS36NVA MILLI-VOLT 38,000 25,000
DFS36NTA T-STAT 38,000 25,000
DFS36NHA HI/LO REMOTE 38,000 20,000
DFS42NMA MANUAL 38,000 20,000
DFS42NVA MILLI-VOLT 38,000 25,000
DFS42NTA T-STAT 38,000 25,000
DFS42NHA HI/LO REMOTE 38,000 20,000
Gas Rate
Model Number Control Max BTU/Hr Min BTU/Hr
DFS32PMA MANUAL 28,000 18,000
DFS32PVA MILLI-VOLT 28,000 20,000
DFS32PTA T-STAT 28,000 20,000
DFS32PHA HI/LO REMOTE 28,000 21,000
DFS3224PMA MANUAL 38,000 20,000
DFS3224PVA MILLI-VOLT 38,000 30,000
DFS3224PTA T-STAT 38,000 30,000
DFS322PHA HI/LO REMOTE 38,000 22,000
DFS36PMA MANUAL 38,000 20,000
DFS36PVA MILLI-VOLT 38,000 30,000
DFS36PTA T-STAT 38,000 30,000
DFS36PHA HI/LO REMOTE 38,000 22,000
DFS42PMA MANUAL 38,000 20,000
DFS42PVA MILLI-VOLT 38,000 30,000
DFS42PTA T-STAT 38,000 30,000
DFS42PHA HI/LO REMOTE 38,000 22,000
Gas Rate
Gas Rate
Model Number Control Max BTU/Hr Min BTU/Hr
DFS32PMA MANUAL 28,000 18,000
DFS32PVA MILLI-VOLT 28,000 20,000
DFS32PTA T-STAT 28,000 20,000
DFS32PHA HI/LO REMOTE 28,000 21,000
DFS3224PMA MANUAL 38,000 20,000
DFS3224PVA MILLI-VOLT 38,000 30,000
DFS3224PTA T-STAT 38,000 30,000
DFS322PHA HI/LO REMOTE 38,000 22,000
DFS36PMA MANUAL 38,000 20,000
DFS36PVA MILLI-VOLT 38,000 30,000
DFS36PTA T-STAT 38,000 30,000
DFS36PHA HI/LO REMOTE 38,000 22,000
DFS42PMA MANUAL 38,000 20,000
DFS42PVA MILLI-VOLT 38,000 30,000
DFS42PTA T-STAT 38,000 30,000
DFS42PHA HI/LO REMOTE 38,000 22,000
Gas Rate
Model Number Control Max BTU/Hr Min BTU/Hr
DFS32PMA MANUAL 28,000 18,000
DFS32PVA MILLI-VOLT 28,000 20,000
DFS32PTA T-STAT 28,000 20,000
DFS32PHA HI/LO REMOTE 28,000 21,000
DFS3224PMA MANUAL 38,000 20,000
DFS3224PVA MILLI-VOLT 38,000 30,000
DFS3224PTA T-STAT 38,000 30,000
DFS322PHA HI/LO REMOTE 38,000 22,000
DFS36PMA MANUAL 38,000 20,000
DFS36PVA MILLI-VOLT 38,000 30,000
DFS36PTA T-STAT 38,000 30,000
DFS36PHA HI/LO REMOTE 38,000 22,000
DFS42PMA MANUAL 38,000 20,000
DFS42PVA MILLI-VOLT 38,000 30,000
DFS42PTA T-STAT 38,000 30,000
DFS42PHA HI/LO REMOTE 38,000 22,000
Model Number Control Max BTU/Hr Min BTU/Hr
DFS32PMA MANUAL 28,000 18,000
DFS32PVA MILLI-VOLT 28,000 20,000
DFS32PTA T-STAT 28,000 20,000
DFS32PHA HI/LO REMOTE 28,000 21,000
DFS3224PMA MANUAL 38,000 20,000
DFS3224PVA MILLI-VOLT 38,000 30,000
DFS3224PTA T-STAT 38,000 30,000
DFS322PHA HI/LO REMOTE 38,000 22,000
DFS36PMA MANUAL 38,000 20,000
DFS36PVA MILLI-VOLT 38,000 30,000
DFS36PTA T-STAT 38,000 30,000
DFS36PHA HI/LO REMOTE 38,000 22,000
DFS42PMA MANUAL 38,000 20,000
DFS42PVA MILLI-VOLT 38,000 30,000
DFS42PTA T-STAT 38,000 30,000
DFS42PHA HI/LO REMOTE 38,000 22,000

26D3310
7
SPECIFICATIONS
IGNITION CONTROLS
Piezo ignitor allows ignition of the pilot without the use of matches or batteries.
Manual 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.
HI/LOW
- Variable position corresponding to desired fl ame height.
Hi/Lo valve control has four (4) positions:
OFF
- All gas to the gas logs is shut off at the valve.
PILOT
- Valve position to light/maintain a standing pilot.
ON
- Valve position to turn ON.
HI/LOW
- Variable position corresponding to desired fl ame height back to pilot.
Milli-Volt and T-Stat control has four (4) positions:
OFF
- All gas to the gas logs is shut off at the valve.
IGN
- Valve position to light/maintain a standing pilot.
ON
- Valve position to turn ON/OFF log set with remote switch/thermostat.
LOW/HI
- Variable position to control fl ame height (heat output). Both front and rear burners are in operation
to provide realistic glow and yellow fl ame.
PILOT
The gas log heater is fi 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.
THERMAL GENERATOR
The milli-volt gas log pilot is fi tted with a milli-volt generator to provide power for remote activation.

8
26D3310
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 log grate/burner assembly
• Installation/operating instructions
• Ceramic fi ber logs
• Two (2) radiant face plates
• Plastic bag containing crushed volcanic rock
• Two (2) anchoring screws
• Canopy and fi ve (5) mounting screws
• Remote Control (Hi/Lo Model Only)
The milli-volt 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 thermostat with 15' wire
• Hand held Thermostat Remote with receiver
• Thermostat Sensor
• Handle the gas log burner assembly by the grate only. Do not pick the unit up
by the burners.
• Gloves are recommended when handling ceramic fi ber logs to prevent skin irritation
from loose fi bers. Logs are fragile — handle with care.
WARNING
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 and 1/2 lb. natural gas systems only)
• Piping which complies with local codes
• Pipe wrench or appropriate size crescent wrench set
• Pipe sealant approved for use with propane/LPG (Resistant to sulfur compounds)
• Sediment trap
• Manual shutoff valve
• Tee joint.
• Drill with 5/32 bit
• Phillips head screwdriver
GETTING STARTED

26D3310
9
GENERAL INSTALLATION INFORMATION
In planning the installation for the fi replace 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 of 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 certifi ed tradesman).
4. Install optional ON/OFF kit on units with milli-volt
control. Refer to 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 / certifi ed
tradesman).
6. Complete fi nish wall material and/or surround.
D
F
E
H
G
6 3/4"
6 3/4"
21"
2 1.2" 2 1/2"
5/8"
37 1/4"
33 3/4"
2 1/4"
1 1/4" Knockout
@ 2 1/4" HT
1 3/4"
7/8" Knockout @ 1 2/3" HT
13 5/8"
12 1/4"
C
B
A
DFS32A
DFS3224A DFS36 DFS42
A
37" 41" 47"
B
32" 36" 42"
C
16" 16" 16"
D
28
3
/
4
" 32
1
/
4
" 38
1
/
2
"
E
18
3
/
4
" 18
3
/
4
" 18
3
/
4
"
F
21
1
/
2
" 25
1
/
2
" 31
1
/
2
"
G
12
1
/
2
" 12
1
/
2
" 12
1
/
2
"
H
27
1
/
2
" 31
1
/
2
" 37
1
/
2
"
Figure 2 - Firebox Dimensions with Screen and Log Sets Removed

10
26D3310
GENERAL INSTALLATION INFORMATION
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
ADEQUATE COMBUSTION AND VENTILATION AIR
This heater shall not be installed in a confi ned space or unusually tight construction unless provisions are provided
for adequate combustion and ventilation air.
The National Fuel Gas Code, (ANSI Z223.1/NFPA54),
defi nes a confi ned space as a space whose volume is less than 50
cubic feet per 1,000 BTU per hour (4.8 m
3
per kw) of the aggregate input rating of all appliances installed in that
space, and an unconfi ned space as a space whose volume is not less than 50 cubic feet per 1,000 BTU per hour (4.8
m
3
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 unconfi ned space.
UNUSUALLY TIGHT CONSTRUCTION IS DEFINED AS CONSTRUCTION WHERE…
a) walls and ceilings exposed to the outside atmosphere have a continuous water vapor retarder with a rating of 1 perm
(6 x 10
11
kg per pa/sec-m
2
) 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 fl oors, between wall-ceiling joints, between wall panels, at penetrations for plumbing, electrical, and gas
lines, and at other openings.
Do not install the heater …
• Where curtains, furniture, clothing, or other fl ammable objects are less than 42"
from the front of the heater.
• In high traffi c areas.
• In windy or drafty areas.
WARNING

26D3310
11
W
H
WARNING
The following formula can be used to determine the maximum heater rating per the defi nition of unconfi ned space:
BTU/Hr = (L
BTU/Hr = (L
1
+ L
2
) Ft x (W) Ft x (H) Ft
) Ft x (W) Ft x (H) Ft
50
Consider two connecting rooms with an open area between, with the following dimensions:
L
1
= 15
1
/
2
Ft., L
2
= 12 Ft., W = 12 Ft., H = 8 Ft.
BTU/Hr = (15
BTU/Hr = (15
1
/
2
+ 12) x (12) x (8)
+ 12) x (12) x (8)
50
If there were a door between the two rooms the calculation would be based only on the room with the heater.
BTU/Hr = (15
BTU/Hr = (15
1
/
2
) x (12) x (8)
) x (12) x (8)
50
GENERAL INSTALLATION INFORMATION
Figure 3 - Example of a Large Room with 1/2 Wall Divider
Counter
Fireplace
Fireplace
Counter
x 1000
x 1000 = 52800 BTU/Hr
x 1000 = 29760 BTU/Hr
If the area in which the heater may be operated is smaller than that defi ned as an
unconfi ned space or if the building is of unusually tight construction, provide adequate
combustion and ventilation air by one of the methods described in the National Fuel
Gas Code, ANSI Z223.1/NFPA54, Section 5.3 or applicable local codes.
WARNING
WARNING

12
26D3310
GENERAL INSTALLATION INFORMATION
REMOVING SCREEN
Remove fi replace screen frame panel by pushing screen frame panel up and out.
See Figure 4.
Figure 5 - Canopy Installation
INSTALLING CANOPY
1. Remove the fi replace screen as described in the previous section.
2. Align the black canopy with the holes in the top frame assembly.
See Figure 5.
3. Install the three (3) screws (in ownerʼs manual packaging) which attach the canopy to the top frame assembly.
See Figure 5.
4. Tighten all screws. Make sure the canopy is level and secure. Install the fi replace screen.
Figure 4 - Removing Fireplace Screen Frame Panel
NOTE: Fireplace screen must be removed to access log box and to install canopy.
Canopy
Fireplace
Screen
Canopy
Screws
Do not operate the unit without
the screen frame panel and canopy
installed.
WARNING

26D3310
13
GENERAL INSTALLATION INFORMATION
SECURING HEATER TO FLOOR OR HEARTH
Note: Clearance requirements as detailed in
“
C
learances and Height Requirements” section of this
manual, must be met before securing the heater in
place.
To prevent movement, the heater must be secured to the
fl oor 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 6.
4. Lift grate and base assembly out of the fi rebox.
CAUTION: Lift grate and base assembly using
the grate only.
5. Secure the fi rebox with two anchoring screws (
3
/
16
" x
1
1
/
4
" length) supplied with the fi replace system.
See
Figure 7.
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.
INSTALLING RADIANT FACE PLATES
1. Remove the two radiant face plates from the uprights on
the top of the fi rebox. Remove packing foam.
2. Snap off the three upper louvers and the three lower
louvers as shown in
Figure 7
.
3. Snap on the upper radiant face plate and the lower radiant
face plate as shown in
Figure 7
.
Figure 6 - Removing Grate
Grate
Screws
Radiant
Face Plate
Louvers
Figure 7 - Installing Radiant Face Plates
Radiant
Face Plate
Louvers
Louvers

14
26D3310
LOCATION OF FIREPLACE
Carefully select the best location for installation of your unvented fi replace. The following factors should be taken
into consideration.
• Clearance to side wall, ceiling, woodwork and window or other combustibles. Refer to
“
Clearances and Height
Requirements
”
section on page 15. 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 THIS MODEL IN A BEDROOM OR BATHROOM.
• Location should be out of high traffi c areas and away from furniture and draperies due to heat from fi rebox.
• Never obstruct the front opening of the unvented fi replace or restrict the fl ow of combustion and ventilation air.
• Minimize modifi cations to existing construction.
See Figure 8
below for location suggestions.
• Do not install in the vicinity where gasoline or other fl ammable liquids may be stored. The unvented fi rebox must be
kept clear and free from the combustible materials.
Figure 8 - Suggested Locations

26D3310
15
9"
Minimum
9"
Minimum
42" Minimum
12"
2 1/2"
10"
19"
CLEARANCES
AND
HEIGHT REQUIREMENTS
Sidewall and ceiling clearances:
The
clearance from the inside of the appliance to
any combustible adjacent wall should no be
less than 9".
See Figure 9.
Ceiling clearance:
The ceiling must be at
least 42" from the top of the fi rebox opening.
See Figure 9.
Back wall clearance:
The appliance may
be placed against a combustible back wall.
Floor clearance:
The fi replace may not
be installed onto any combustible fl 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.
Mantel clearances:
The canopy supplied
with the unit must be installed. If a combus-
tible mantel is installed. It must meet the
clearance requirements shown in
Figure
10.
Figure 9 - Sidewall and Ceiling Clearances
The dimensions shown in Figures 9 and 10 and defi ned in the fi replace manufacturer's
instructions are
minimum clearances
to maintain when 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 to follow
instructions exactly can create a fi re hazard.
WARNING
Figure 10 - Minimum Mantel Clearances

16
26D3310
H
D
G
F
A
C
E
1/2" or 5/8"
C
A
G
C
G
A
FIREPLACE FRAMING
If unit is to be “built in”, fi replace 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 fi replace framing following
Figures 11 through 14. Refer to Figure 2 on page 9
for fi replace dimensions. The framing headers may rest directly on top of the fi rebox.
The fi replace may be installed directly on a combustible fl oor or a raised platform of an appropriate height. Do not place
fi replace on carpeting, vinyl, tile or other soft fl oor coverings. It may, however, be placed on fl at wood, plywood, particle
board or other hard surfaces. Be sure fi replace rests on a solid continuous fl oor or platform with appropriate framing for
support and so that no cold air can enter from under the fi rebox.
Anchor fi replace to the side framing members using optional nailing fl ange kit. See installation instructions included
with the kit.
B
A
Figure 11 - Corner Installation
Figure 12- Inside Chase Installation
Figure 14- Recessed Installation
Figure 13 - Stud Location
Unfi nished/rough
framing surface
Unfi nished/rough
framing surface
Unfi nished/rough
framing surface
5
1
5
1
/
5
/
/
// /
8
" or
"
" or
"
o
" or
o
r
" or
r
equivalent
clearance
for drywall/
fi nishing
materials
5
/
8
" or equivalent
clearance for
drywall/fi nishing
materials
DFS3224A DFS36A DFS42A
A
37
1
/
4
" 41
1
/
4
" 47
1
/
4
"
B
37
3
/
4
" 37
3
/
4
" 37
3
/
4
"
C
28
3
/
4
" 32
3
/
4
" 38
3
/
4
"
D
14
3
/
8
" 16
5
/
8
" 19
3
/
8
"
E
60
3
/
4
" 65
1
/
4
" 70
3
/
4
"
F
30
3
/
8
" 32
5
/
8
" 35
3
/
8
"
G
16" 16" 16"
H
43" 46
1
/
4
" 50"
DFS3224A DFS36A DFS42A
" 41
" 37
" 32
" 16
" 65
" 32
16" 16" 16"
43" 46
DFS3224A DFS36A DFS42A
" 47
" 37
" 38
" 19
" 70
" 35
16" 16" 16"
" 50"
37
37
28
14
60
30
16" 16" 16"
43" 46

26D3310
17
DFS32A/DFS3224A with trim DFS36A with trim DFS42A with trim
K
38" 41
7
/
8
" 47
7
/
8
"
J
35
7
/
8
" 35
7
/
8
" 35
7
/
8
"
FIREPLACE FRAMING
K
J
1. Bend out the nailing fl anges located on each side of the fi rebox.
2. Slide the fi rebox into prepared framing or position fi rebox in its fi nal position and frame later.
3. Level the fi rebox by checking the top edge of the fi rebox. Shim if necessary.
4. Anchor fi rebox to the side framing members using 8d nails or other suitable fasteners.
Refer to Figure 16.
5. The canopy must be installed for safe operation of the heater. Refer to page 12 for canopy installation details.
When fi nishing a custom cabinet, mantel, or other built-in enclosure,
the opening size to accommodate the fi replace with trim installed
is as follows:
WARNING
Figure 15 - Custom Cabinet
Figure 16 - Location of Nailing Flanges
Nail Sides
Through Nailing
Flanges
DFS32A/DFS3224A with trim DFS36A with trim DFS42A with trim
" 47
" 35
DFS32A/DFS3224A with trim DFS36A with trim DFS42A with trim
38" 41
35
The fi replace must be installed giving
WARNING
The fi replace must be installed giving
WARNING
full consideration to the clearance
WARNING
full consideration to the clearance
WARNING
and height requirements identifi ed in
WARNING
and height requirements identifi ed in
WARNING
this manual.
WARNING
this manual.
WARNING
WARNING
WARNING
DFS32A/DFS3224A with trim DFS36A with trim DFS42A with trim
" 47
DFS32A/DFS3224A with trim DFS36A with trim DFS42A with trim
" 47
" 35
" 35
DFS32A/DFS3224A with trim DFS36A with trim DFS42A with trim
38" 41
" 35

18
26D3310
Pipe Coupling
To Heater
Valve
Gas Supply
Inlet
CONNECTING THE GAS
NOTICE: A qualifi ed gas appliance installer must connect the heater to the gas supply. Consult all local
codes.
IMPORTANT:
Hold heater valve fi rmly with a wrench to prevent movement when connecting to inlet pipe.
Manual Shutoff
Valve
Pipe
Stainless
Flexible Tube
Figure 17 - Gas Connection
Pipe Coupling
Always use an external regulator for all propane/LPG heaters and high pressure one to two-pound systems
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.
Locations that the Pressure
Tapping Point May Be Installed
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.
WARNING
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 sulfi de 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 fl ow 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.
See Figure 17.
CAUTION

26D3310
19
WARNING
CHECKING GAS PRESSURE
NPT Test Plug
MANUAL CONTROL
(
Figure
18)
The pressure regulator is preset and locked to
discourage tampering.
If the pressure is not as
specifi ed, 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 fi tting and tubing to pressure gauge.
After taking pressure reading, reinstall test plug.
Check for gas leaks.
MILLI-VOLT CONTROL AND
THERMOSTAT CONTROL
(Figure 20)
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 clockwise fi rmly to re-seal. Do not
over torque. Check for gas leaks.
Figure 18 - Pressure Test Point Location
Manual Control
Figure 20 - Pressure Test Point Location
Milli-Volt Control
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.
DO NOT USE AN OPEN FLAME.
Check the gas pressure with the appliance burning and the control set to
HIGH
.
Connecting directly to an
unregulated propane/LPG tank
can cause an explosion.
WARNING
Figure 19 - Pressure Test Point Location
Hi/Lo Control
Test Port “OUT”
Test Port “OUT”
“OUT” Test Port
HI/LO REMOTE CONTROL
(
Figure
19)
Turn captured screw counter clockwise two or three
turns. (The port is labeled “OUT”) Place tubing to
pressure gauge over test point. After taking pressure
reading, be sure to turn captured screw clockwise
fi rmly to reseal. Do not over torque. Check for gas
leaks.

20
26D3310
ELECTRICAL WIRING (MILLI-VOLT)
The milli-volt valve is a self-powered combination gas control
THAT DOES NOT REQUIRE 110 VAC TO
OPERATE.
CONNECTING OPTIONAL WALL SWITCH OR THERMOSTAT
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.
Figure 21 - Wiring Diagram
Optional Wall
Switch or Remote
Receiver
Switch
On/Off
Switch
On/Off
Switch
Wall
Switch
ODS
Pilot
Valve
TH = 3
TP = 1
TP/TH = 2
ODS
Pilot
Spade
Terminal
Pilot
Switch
Switch
Label all wires prior to disconnection
when servicing controls. Wiring
errors can cause improper and
dangerous operation. Verify proper
operation after servicing.
WARNING