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107297

OWNER’S MANUAL

INSTALLATION

 WARNING: A qualified ser-

vice person must install heater.
Follow all local codes.

CHECK GAS TYPE

Use only propane/LP gas. If your gas supply
is not propane/LP, do not install heater. Call
dealer where you bought heater for proper
type heater.

INSTALLATION ITEMS

Before installing heater, make sure you have
the items listed below.

• external regulator (supplied by installer)

• piping (check local codes)

• sealant (resistant to propane/LP gas)

• equipment shutoff valve *

• ground joint union

• test gauge connection *

• sediment trap

• tee joint

• pipe wrench

* A CSA/AGA design-certified equipment
shutoff valve with 1/8" NPT tap is an ac-
ceptable alternative to test gauge connec-
tion. Purchase the optional CSA/AGA de-
sign-certified equipment shutoff valve from
your dealer. See Accessories, page 19.

LOCATING HEATER

This heater is designed to be mounted on
a wall.

 WARNING: Maintain the mini-

mum clearances shown in Figure
4. If you can, provide greater clear-
ances from floor, ceiling, and
joining wall.

You can locate heater on floor, away from a
wall. An optional floor mounting stand is
needed. Purchase the floor mounting stand
from your dealer. See Accessories, page 19.

 WARNING:  Never install the

heater
• in a bedroom or bathroom
• in a recreational vehicle
• where curtains, furniture,

clothing, or other flammable
objects are less than 36 inches
from the front, top, or sides of
the heater

• as a fireplace insert
• in high traffic areas
• in windy or drafty areas

IMPORTANT:

 Vent-free heaters add mois-

ture to the air. Although this is beneficial,
installing heater in rooms without enough
ventilation air may cause mildew to form from
too much moisture. See Fresh-Air for Com-
bustion and Ventilation, 
pages 4 through 6.

Continued

 CAUTION: If you install the

heater in a home garage
• heater pilot and burner must

be at least 18 inches above
floor

• locate heater where moving ve-

hicle will not hit it

 CAUTION: This heater cre-

ates warm air currents. These
currents move heat to wall sur-
faces next to heater. Installing
heater next to vinyl or cloth wall
coverings or operating heater
where impurities (such as to-
bacco smoke, aromatic candles,
cleaning fluids, oil or kerosene
lamps, etc.) in the air exist, may
discolor walls.

NOTICE: This heater is intended
for use as supplemental heat. Use
this heater along with your pri-
mary heating system. Do not in-
stall this heater as your primary
heat source. If you have a central
heating system, you may run
system’s circulating blower while
using heater . This will help circu-
late the heat throughout the
house. In the event of a power
outage, you can use this heater
as your primary heat source.

For convenience and efficiency, install heater

• where there is easy access for operation,

inspection, and service

• in coldest part of room

An optional fan kit is available from your
dealer. See Accessories, page 19. If plan-
ning to use fan, locate heater near an
electrical outlet.

36"

2"

FLOOR

CEILING

Minimum

Minimum to
Top Surface 
of Carpeting, 
Tile or Other
Combustible
Material

8"

Minimum
From
Sides Of
Heater

Left
Side

Right
Side

Figure 4 - Mounting Clearances As Viewed
From Front of Heater

INSTALLING THERMOSTAT
SENSING BULB -

For T-Stat Models Only

Remove clip and bulb from shipping loca-
tion. Place clip and bulb into operation loca-
tion (see Figure 5)

Figure 5 - Moving Thermostat Sensing
Bulb

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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