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107297

INFRARED PROPANE/LP GAS HEATER

FRESH AIR FOR
COMBUSTION AND
VENTILATION

Today’s homes are built more energy effi-
cient than ever. New materials, increased
insulation, and new construction methods
help reduce heat loss in homes. Home owners
weather strip and caulk around windows and
doors to keep the cold air out and the warm air
in. During heating months, home owners
want their homes as airtight as possible.

While it is good to make your home energy
efficient, your home needs to breathe. Fresh
air must enter your home. All fuel-burning
appliances need fresh air for proper com-
bustion and ventilation.

Exhaust fans, fireplaces, clothes dryers, and
fuel burning appliances draw air from the
house to operate. You must provide ad-
equate fresh air for these appliances. This
will insure proper venting of vented fuel-
burning appliances.

PRODUCING ADEQUATE
VENTILATION

The following are excerpts from National
Fuel Gas Code, NFPA 54/ANS Z223.1, Sec-
tion 5.3, Air for Combustion and Ventilation.

All spaces in homes fall into one of the three
following ventilation classifications:

1.

Unusually Tight Construction

2.

Unconfined Space

3.

Confined Space

The information on pages 4 through 6 will
help you classify your space and provide
adequate ventilation.

Unusually Tight Construction

The air that leaks around doors and win-
dows may provide enough fresh air for
combustion and ventilation. However, in
buildings of unusually tight construction,
you must provide additional fresh air.

Unusually tight construction is de-
fined as construction where:

a.

walls and ceilings exposed to the
outside atmosphere have a con-
tinuous water vapor retarder with
a rating of one perm (6 x 10

-11 

kg

per pa-sec-m

2

) or less with open-

ings gasketed or sealed 

and

b. weather stripping 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, be-
tween sole plates and floors, be-
tween wall-ceiling joints, be-
tween wall panels, at penetra-
tions for plumbing, electrical, and
gas lines, and at other openings.

If your home meets all of the three
criteria above, you must provide ad-
ditional fresh air. See 

Ventilation Air

From Outdoors, page 6.

If your home does not meet all of the
three criteria above, see 

Determining

Fresh-Air Flow for Heater Location,
page 5.

Confined and Unconfined Space

The National Fuel Gas Code ANS Z223.1
defines a confined 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 aggre-

gate input rating of all appliances installed
in that space and an unconfined space as a
space whose volume is not less than 50
cubic feet per 1,000 Btu per hour (4.8 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 con-
sidered a part of the unconfined space.

This heater shall not be installed in a con-
fined space or unusually tight construction
unless provisions are provided for adequate
combustion and ventilation air.

* Adjoining rooms are communicating only
if there are doorless passageways or ventila-
tion grills between them.

 WARNING: This heater shall

not be installed in a confined space
or unusually tight construction
unless provisions are provided
for adequate combustion and ven-
tilation air. Read the following in-
structions to insure proper fresh
air for this and other fuel-burning
appliances in your home.

Summary of Contents for FBS-3B

Page 1: ...ed by a qualified installer service agency or the gas supplier Aftermarket Completion of sale not for purpose of resale from the manufacturer WARNING This is an unvented gas fired heater It uses air o...

Page 2: ...ir ven tilation to run properly This heater has an Oxygen Depletion Sensing ODS safety shutoff system The ODS shuts down the heater if not enough fresh air is available See Fresh Air for Combus tion a...

Page 3: ...safety shutoff system The ODS pilot is a required feature for vent free room heaters The ODS pilot shuts off the heater if there is not enough fresh air PIEZO IGNITION SYSTEM This heater has a piezo i...

Page 4: ...rating of one perm 6 x 10 11 kg per pa sec m2 or less with open ings gasketed or sealed and b weather stripping has been added on openable windows and doors and c caulking or sealants are applied to...

Page 5: ...Do not include direct vent gas appliances Direct vent draws combustion air from the outdoors and vents to the outdoors 4 Compare the maximum Btu Hr the space can support with the actual amount of Btu...

Page 6: ...ce To Crawl Space To Attic FRESH AIR FOR COMBUSTION AND VENTILATION Continued Or Remove Door into Adjoining Room Option 3 Ventilation Grills Into Adjoining Room Option 2 12 12 Ventilation Grills into...

Page 7: ...ing heater in rooms without enough ventilationairmaycausemildewtoformfrom too much moisture See Fresh Air for Com bustion and Ventilation pages 4 through 6 Continued CAUTION If you install the heater...

Page 8: ...WARNING Maintainminimum clearances shown in Figure 8 If you can provide greater clear ancesfromfloorandjoiningwall INSTALLING HEATER TO WALL Mounting Bracket The mounting bracket is located on back p...

Page 9: ...ocations using 9 64 drill bit 2 Place mounting bracket onto wall Line up last hole on each end of bracket with holes drilled in wall 3 Insert mounting screws through bracket and into wall studs 4 Tigh...

Page 10: ...ts This keeps them from going into heater controls If sediment trap is not installed or is installed wrong heater may not run properly IMPORTANT Hold pressure regulator with wrench when connecting it...

Page 11: ...gas joints Bubbles forming show a leak 5 Correct all leaks at once 6 Light heater see Operating Heater column 3 and page 12 for non thermo stat models pages 13 and 14 for ther mostat models Check the...

Page 12: ...qualified service person or supplier for repairs 6 Release downward pressure on con trol knob and turn clockwise to OFF position 7 Press in control knob and turn back to PILOT IGN This will cause the...

Page 13: ...OFF ON PILOT IGN 1 7 3 5 4 6 2 Figure 23 Burner Patterns Temperature Control Setting Knob Knob FBS 3C FBS 5C ON OFF 3 Pushincontrolknobslightlyandturn clockwise to the OFF posi tion Be sure that the...

Page 14: ...Turn Off Gas to Ap pliance page 12 for non thermostat mod els or page 13 for thermostat models see Troubleshooting pages 15 through 17 Figure 25 Incorrect Pilot Flame Pattern GRH OV 009 GOOD PILOT Fi...

Page 15: ...ally clogged ODS pilot 6 Thermocouple damaged 7 Control valve damaged REMEDY 1 Replace ignitor 2 Replace ignitor 3 Reconnect ignitor cable 4 Free ignitor cable if pinched by any metal or tubing Keep i...

Page 16: ...r replace burner orifice s 2 Replace burner 3 Replace gas regulator 1 Replace burner 2 Contact local propane LP gas company 3 Turn control knob until it locks at de sired setting 1 Problem will stop a...

Page 17: ...OBLEM Heater produces unwanted odors Heater shuts off in use ODS operates Gas odor even when control knob is in OFF position Gas odor during combustion Moisture condensationnoticedonwindows REMEDY 1 V...

Page 18: ...n KY 42103 3414 270 846 1199 1 800 654 8534 Fax 1 800 846 0090 franktalk aol com Master Parts Dist 1251 Mound Ave NW Grand Rapids MI 49504 2672 616 791 0505 1 800 446 1446 Fax 616 791 8270 www nbmc co...

Page 19: ...omthe address listed on the back page of this manual Send a check for 5 00 payable to DESA International SERVICE HINTS When Gas Pressure is Too Low pilot will not stay lit burner s will have delayed i...

Page 20: ...97 INFRARED PROPANE LP GAS HEATER 26 19 25 25 24 7 2 7 1 20 21 22 23 3 4 See Detail ILLUSTRATED PARTS BREAKDOWN FB 3B Burner Assembly 11 10 6 16 7 9 14 7 13 12 8 17 15 5 4 18 18 18 5 1 5 2 ODS Pilot A...

Page 21: ...98411 01 Ignitor Line 1 10 L98028 01 Control Valve Bracket 1 11 L98054 01 Control Valve Fixed Nut 1 12 L98059 01 Control Valve Main Inlet Nut 1 13 L98115 02 Main Inlet Tube Assembly 1 14 L98123 02 ODS...

Page 22: ...HEATER ILLUSTRATED PARTS BREAKDOWN FB 5B Burner Assembly 31 24 30 30 29 7 2 4 See Detail 7 1 25 26 27 28 3 11 10 4 6 7 5 9 7 21 19 23 22 22 22 22 22 20 18 13 14 12 8 14 16 23 15 17 TO B1 TO B2 TO C1...

Page 23: ...1 12 L98059 01 Control Valve Main Inlet Nut 1 13 L98115 01 Main Inlet Tube Assembly 1 14 L98123 01 ODS Gas Line Assembly 1 15 L98116 01 Burner Gas Line Assembly C 1 16 L98117 01 Burner Gas Line Assem...

Page 24: ...PROPANE LP GAS HEATER ILLUSTRATED PARTS BREAKDOWN FBS 3C Burner Assembly 15 16 13 17 21 20 11 9 12 19 16 14 10 4 21 18 16 16 27 2 27 26 22 23 1 24 25 16 8 16 13 7 9 17 22 4 See Detail 3 5 6 14 1 14 2...

Page 25: ...tor Bracket 1 12 L98057 01 4 Way Connector Fixed Nut 1 13 L98411 01 Ignitor Line 1 14 L98071 04 ODS Pilot 1 14 1 098514 01 Thermocouple 1 14 2 L98071 07 Ignitor Electrode 1 15 L98072 01 ODS Mounting B...

Page 26: ...USTRATED PARTS BREAKDOWN FBS 5B Burner Assembly 12 11 4 15 16 14 13 16 24 22 26 23 19 26 25 25 25 25 25 20 17 10 18 21 9 TO B1 TO B2 TO C1 TO C2 16 16 32 2 32 31 27 28 1 29 30 16 8 16 13 7 9 17 27 4 S...

Page 27: ...Assembly 1 14 1 098514 01 Thermocouple 1 14 2 L98071 07 Ignitor Electrode 1 15 L98072 01 ODS Mounting Bracket 1 16 L98817 01 Self Tapping Screw 14 17 L98123 03 ODS Gas Line Assembly 1 18 L98116 02 Bu...

Page 28: ...shed with the unit This warranty does not apply to parts that are not in original condition because of normal wear and tear or parts that fail or become damaged as a result of misuse accidents lack of...

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