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125524-01A

7

AIR FOR COMbUSTION AND VENTILATION

Continued

If your home meets all of the three criteria 

above, you must provide additional fresh 

air.  See 

Ventilation Air  From  Outdoors

page 8.

If  your  home  does  not  meet  all  of  the 

three criteria above, proceed to 

Determin-

ing 

Fresh-Air  Flow  For  Heater  Location

below.
Confined and Unconfined Space

The National Fuel Gas Code, ANSI Z223.1/

NFPA 54 

defines a confined space as a space 

whose volume is less than 50 cubic feet per 

1,000 Btu/hr (4.8 m

3

 per kw) of the aggregate 

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/hr (4.8 m

3

 per kw) of the ag-

gregate 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 un

-

confined space.

* Adjoining rooms are communicating only if 

there are doorless passageways or ventilation 

grills between them.

DETERMINING FRESH-AIR FLOW 

FOR HEATER LOCATION

Determining if You Have a Confined or 

Unconfined Space

Use this work sheet to determine if you have 

a confined or unconfined space.

Space: 

Includes the room in which you will install 

fireplace  plus  any  adjoining  rooms  with  door

-

less passageways or ventilation grills between 

the rooms.
1.  Determine the volume of the space (length 

x width x height).

 

Length x Width x Height =__________cu. ft. 

(volume of space)

 

Example:

 Space size 20 ft. (length) x 16 ft. 

(width) x 8 ft. (ceiling height) = 2560 cu. ft. 

(volume of space)

 

If  additional  ventilation  to  adjoining  room 

is supplied with grills or openings, add the 

volume of these rooms to the total volume 

of the space. 

2.  Multiply the space volume by 20 to determine 

the maximum Btu/Hr the space can support.

 

  ________ (volume of space) x 20 = (Maxi-

mum Btu/Hr the space can support)

 

Example:

 2560 cu. ft. (volume of space) x 20 

= 51,200 (maximum Btu/Hr the space can 

support)

3.  Add the Btu/Hr of all fuel burning appliances 

in the space.

 

Vent-free fireplace 

 __________ Btu/Hr

 

Gas water heater* 

 __________ Btu/Hr

 

Gas furnace 

 __________ Btu/Hr

 

Vented gas heater 

 __________ Btu/Hr

 

Gas fireplace logs 

 __________ Btu/Hr

 

Other gas appliances* + _________ Btu/Hr

 

Total  

= _________ Btu/Hr

 

* Do not include direct-vent gas appliances. 

Direct-vent draws combustion air from the 

outdoors and vents to the outdoors.

 

Example:

 

 

Gas water heater 

 __________ Btu/Hr

 

Vent-free fireplace 

+

 _________ Btu/Hr

 

Total 

= _________ Btu/Hr

4.  Compare the maximum Btu/Hr the space can 

support with the actual amount of Btu/Hr used.

 

  _______ Btu/Hr (maximum can support) 

 

  _______ Btu/Hr (actual amount used)

 

Example:

  51,200  Btu/Hr  (maximum  the 

space can support) 

 

 

73,000 Btu/Hr (actual amount of 

Btu/Hr used)

The space in the above example is a confined 

space because the actual Btu/Hr used is more 

than the maximum Btu/Hr the space can sup-

port. You must provide additional fresh air. Your 

options are as follows:

A.  Rework worksheet, adding the space of an 

adjoining room. If the extra space provides 

an unconfined space, remove door to adjoin

-

ing  room  or  add  ventilation  grills  between 

rooms.  See 

Ventilation  Air  From  Inside 

Building, 

page 8

.

B.  Vent  room  directly  to  the  outdoors.  See 

Ventilation Air From Outdoors, 

page 8.

C.  Install a lower Btu/Hr fireplace, if lower Btu/

Hr size makes room unconfined.

If the actual Btu/Hr used is less than the maxi-

mum Btu/Hr the space can support,

 

the space is 

an unconfined space. You will need no additional 

fresh air ventilation.

  40,000
  33,000
  73,000

Summary of Contents for BG18NM

Page 1: ...pplierfromaneighbor 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 quali fied installer s...

Page 2: ...urning masonry or UL127 factory built fireplace or in a listed ventless firebox enclo sure It is design certified for these installations in accordance with ANSI Z21 11 2 Exception Do not install this...

Page 3: ...ts Make certain you read and understand all warnings Keep this manual for reference It is your guide to safe and proper operation of this fireplace WARNING Any change to this heater or its controls ca...

Page 4: ...sed If you operate heater with doors closed heat buildup inside fireplace will cause glass to burst Make sure there are no obstructions across openings of fireplace 8 To prevent the creation of soot f...

Page 5: ...grate as sembly The data plates contain important warranty and safety information 1 Remove logs and heater base assembly from cartons Note Do not pick up heater base assem bly by burners This could d...

Page 6: ...ld 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...

Page 7: ...enings add the volume of these rooms to the total volume of the space 2 Multiply the space volume by 20 to determine the maximum Btu Hr the space can support _________ volume of space x 20 Maxi mum Bt...

Page 8: ...ure 2 You can also remove door into adjoining room see option 3 Figure 2 Follow the National Fuel Gas Code ANSI Z223 1 NFPA 54 Air for Combustion and Ventilation for required size of ventilation grill...

Page 9: ...oisture 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 Air for Combustion and Ventila tion page 6...

Page 10: ...ensure safe installation into a masonry UL127 listed manufactured fireplace or listed vent free firebox Minimum Clearances For Side Combustible Material Side Wall and Ceiling A Clearances from the si...

Page 11: ...s above the fireplace opening Noncombustible materials such as slate marble tile etc must be at least 1 2 thick With sheet metal you must have noncombustible material be hind it Noncombustible materia...

Page 12: ...el you must maintain the minimum distance of 14 to combustibles see Figure 8 B If combustible materials are less than 14 to the fireplace you must install appliance at least 5 above the combustible fl...

Page 13: ...al Makesurematerial is secure CAUTION Do not pick up heater base assembly by burn ers This could damage heater Only handle base assembly by grates IMPORTANT Make sure the heater burners are level If h...

Page 14: ...Base to Fireplace Floor Masonry Screw CONNECTING TO GAS SUPPLY WARNING A qualified ser vicepersonmustconnectheater to gas supply Follow all local codes CAUTION Never connect propane LP fireplace dire...

Page 15: ...ed matter is not likely to freeze A sediment trap traps moisture and contaminants This keeps them from going into heater controls If sediment trap is not installed or is installed wrong heater may not...

Page 16: ...in gas valve located on or near gas meter for natural gas or using compressed air 4 Check all joints of gas supply piping sys tem Apply noncorrosive leak detection fluid to all joints Bubbles forming...

Page 17: ...WARNING Failure to posi tion the parts in accordance with these diagrams or failure to use only parts specifically approved with this heater may result in property damage or personal injury Log Suppo...

Page 18: ...t Log Figure 20 Installing Log Sets Middle Right Log Middle Left Log Bottom Log Pin on Front Left Log Figure 21 Installing LBG36 SM Model Control Cover Logs Left Control Cover Log Right Control Cover...

Page 19: ...its shape and much lighter weight when compared to the other logs Figure 23 Installing Log Set Base Assembly Ramp Log Figure 24 Installing Log Set Ramp Log Metal Tab 2 The log must sit flat on the bla...

Page 20: ...ly in place as shown in Figures 27 28 Do NOT place ember material anywhere else on the unit Use only ember ma terial supplied with unit Exces sive or incorrectly placed ember material may produce carb...

Page 21: ...replac ing see Parts page 32 Platinum Bright Ember placement Add embers to front flat burner Gently remove embers from bag Separate pieces of ember material and place on surface of flat burner just be...

Page 22: ...nitor Button Location Control Knob Electronic Ignitor Button for your safety read before lighting WARNING If you do not fol low these instructions exactly a fire or explosion may result causing proper...

Page 23: ...ve pilot lit and shut off burners only turn control knob clockwise to the HI position Press in and turn control knob clockwise to the PILOT position Figure 32 Pilot Ignitor Electrode Thermocouple Pilo...

Page 24: ...Your pilot may vary from pilots shown Thermocouple Thermocouple Pilot Burner FRONT BURNER FLAME PATTERN Figure 35 shows correct front burner flame pattern Figure 36 shows incorrect front burner flame...

Page 25: ...r to each heating season Blocked air holes will create soot We recommend that you clean the unit every three months during operation and have heater inspected yearly by a qualified service person We a...

Page 26: ...lightly blow air through the air inlet hole You may blow through a drinking straw if compressed air is not available Cleaning AND MAINTENANCE Continued LOGS If you remove logs for cleaning refer to I...

Page 27: ...n PILOT position 4 Air in gas lines when in stalled 5 Depleted gas supply pro pane LP only 6 ODS pilot is clogged 7 Gas regulator setting is not correct REMEDY 1 Reconnect ignitor cable 2 Free ignitor...

Page 28: ...ntrol knob pressed in 30 seconds 3 Fully open equipment shut off valve 4 A Contact local natural or propane LP gas company B Clean ODS pilot see Cleaning and Maintenance page 25 or replace ODS pilot a...

Page 29: ...let warm up for a minute 2 Operate burners until air is removed from line Have gas line checked by local natural or propane LP gas company 3 Observe minimum installa tion clearances see pages 9 throug...

Page 30: ...g statement at top of page 1 Not enough fresh air is available 2 Low line pressure 3 ODS pilot is partially clogged 1 Gas leak See Warning statement at top of page 2 Control valve or gas control defec...

Page 31: ...ural Ignition Electronic Manifold Pressure 3 4 W C Inlet Gas Pressure in of water Max 10 5 W C Min 5 W C BG2436pM Rating Variable 24 000 35 000 Btu Hr Type Gas Propane LP Ignition Electronic Manifold...

Page 32: ...www fmiproducts com 125524 01A 32 PARTS Variable Manual control Models BG18NM BG18PM BG2436NM BG2436PM 1 3 13 5 16 27 19 18 17 14 6 9 2 4 24 11 25 12 10 8 7 20 15 21 22 23 26 28...

Page 33: ...3242 02 Rear Ramp Burner 1 13 112713 01 Pilot Bracket 1 112713 03 Pilot Bracket 1 14 098276 01 Plug 1 15 112782 02 Air Deflector Bracket 1 112782 03 Air Deflector Bracket 1 16 125003 01 Air Shield 1 1...

Page 34: ...66 01 Flex Tube 1 100563 01 Warning Plate 1 101055 02 Lighting Instruction Plate 1 100639 12 Caution Decal 1 101137 02 Hardware Kit 1 GA6060 Lava Rock 1 125527 01 Left Ember Chunk 1 1 125527 02 Middle...

Page 35: ...ectronic Ignitor 1 11 112465 01 Front Ramp Burner 1 112465 02 Front Ramp Burner 1 12 113242 01 Rear Ramp Burner 1 113242 02 Rear Ramp Burner 1 13 112713 01 Pilot Bracket 1 112713 03 Pilot Bracket 1 12...

Page 36: ...og 1 3 121699 02 121699 08 121699 14 Middle Right Log 1 4 121699 03 121699 09 121699 15 Middle Left Log 1 5 121699 01 121699 13 121699 13 Bottom Log Remote 1 6 121699 06 121699 12 121699 18 Rear Log 1...

Page 37: ...699 21 Front Right Log 1 6 121699 22 Back Log 1 7 121699 23 Left Small Front Log 1 8 121699 24 Right Small Front Log 1 9 121699 25 Left Control Cover Log 1 10 121699 26 Right Control Cover Log 1 1 2 3...

Page 38: ...055 10 Middle Right Log 1 4 125055 16 125055 05 125055 11 Middle Left Log 1 5 125056 01 125056 02 125056 02 Ramp Log 1 6 125055 14 125055 03 125055 09 Rear Log 1 7 125055 06 125055 06 125055 06 Top Lo...

Page 39: ...For all models Includes lava rock burner embers and burner cinders Control Cover Kit CC100 For all models Includes control cover log and 6 unique fall away logs Technical Service You may have further...

Page 40: ...product and or FMI PRODUCTS LLC who will provide original factory replacement parts Failure to use original factory replacement parts voids this warranty Travel handling transportation diagnostic mat...

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