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122136-01C

7

 

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 the space can 
support) 

 

  _______ Btu/Hr (actual amount of Btu/Hr 
used)

 

Example:

  51,200  Btu/Hr  (maximum  the 

space can support) 

 

 

71,500 Btu/Hr (actual amount of 

Btu/Hr used)

The space in the example is a confined space 

because the actual Btu/Hr used is more than the 
maximum  Btu/Hr  the  space  can  support.  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 adjoining 

room or add ventilation grills between rooms. 
See 

Ventilation  Air  From  Inside  Building

page 7.

B.  Vent  room  directly  to  the  outdoors.  See 

Ventilation Air From Outdoors

, page 7.

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.

 WARNING: If the area in which 

the heater may be operated does 

not meet the required volume for 

indoor combustion air, combus

-

tion 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.

VENTILATION AIR

Ventilation Air From Inside Building

This fresh air would come from an adjoining 

unconfined  space.  When  ventilating  to  an 
adjoining unconfined space, you must provide 

two permanent openings: one within 12" of the 

40,000
31,500
71,500

AIR FOR COMbUSTION AND VENTILATION

Continued

Figure 2 - Ventilation Air from Inside 

Building

Or 

Remove 

Door into 
Adjoining 

Room, 
Option 

Ventilation Grills  

Into Adjoining Room, 

Option 2 

Ventilation

Grills Into

Adjoining 

Room,

Option 1

12" 

12" 

Figure 3 - Ventilation Air from Outdoors

Outlet

Air

Ventilated

Attic 

Outlet

Air

Inlet

Air

Inlet Air

Ventilated 

Crawl Space

To 

Crawl

Space

To Attic

ceiling and one within 12" of the floor on the 

wall connecting the two spaces (see options 

1 and 2, Figure 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 

grills or ducts.

Ventilation Air From Outdoors

Provide  extra  fresh  air  by  using  ventilation 
grills or ducts. You must provide two perma-
nent openings: one within 12" of the ceiling 

and one within 12" of the floor. Connect these 

items directly to the outdoors or spaces open 
to the outdoors. These spaces include attics 
and crawl spaces. Follow the 

National Fuel 

Gas  Code  ANSI  Z223.1/NFPA  54,  Air  for 
Combustion and Ventilation

 for required size 

of ventilation grills or ducts.

IMPORTANT:

  Do  not  provide  openings  for 

inlet or outlet air into attic if attic has a thermo-
stat-controlled power vent. Heated air entering 
the attic will activate the power vent.

Summary of Contents for VSB18N

Page 1: ...se any phone in your building Immediatelycallyourgassupplierfromaneighbor s phone Follow the gas supplier s instructions If you cannot reach your gas supplier call the fire department Installation and...

Page 2: ...id fuel burning 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 ins...

Page 3: ...ll 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 can be dangerous WARNING Do not use a blowe...

Page 4: ...ank of less than 100 lbs capacity is not recommended propane LP units only 4 If you smell gas shut off gas supply do not try to light any appliance do not touch any electrical switch do not use any ph...

Page 5: ...heaters Non thermostat models may also be operated as a vented decorative ANSI Z21 60 product by opening flue damper Safety Pilot This heater has a pilot with an Oxygen Deple tion Sensing ODS safety s...

Page 6: ...se volume is less than 50 cubic feet per AIR FOR COMBUSTION AND VENTILATION Continued 1 000 Btu per hour 4 8 m3 per kw of the ag gregate input rating of all appliances installed in that space and an u...

Page 7: ...asCode or applicable local codes VENTILATION AIR Ventilation Air From Inside Building This fresh air would come from an adjoining unconfined space When ventilating to an adjoining unconfined space you...

Page 8: ...heat resistant sealant Do not seal chimney flue damper Installation WARNING Never install the heater in a bedroom or bathroom unless installed as a vented appliance see page 11 in a recreational vehi...

Page 9: ...ceiling should not be less than 42 Figure 4 Minimum Clearance for Combustible to Wall Minimum 16 from Side Wall Example INSTALLATION Continued NOTICE Manualcontrolheaters maybeusedasaventedproduct Ifs...

Page 10: ...t required clearances between fireplace opening and mantel shelf If you do not meet the clearances listed below you will need a hood Determining Minimum Mantel Clearance If you meet minimum clearance...

Page 11: ...ree reasons for operating your heater in the vented mode 1 The fireplace does not meet the clearance to combustibles requirements for vent free operation 2 State or local codes do not permit vent free...

Page 12: ...lant resistant to propane LP gas not provided electric drill with 3 16 drill bit flathead screwdriver 1 Apply pipe joint sealant lightly to male threads of the fitting to be threaded into gas regulato...

Page 13: ...ill reduce incoming gas pressure You must reduce incoming gas pressure to between 11 and 14 of water If you do not reduce incom ing gas pressure heater regulator damage could occur Install external re...

Page 14: ...lator 2 Cap off open end of gas pipe where equip ment shutoff valve was connected 3 Pressurize supply piping system by either opening propane LP supply tank valve for propane LP gas or opening main ga...

Page 15: ...check to see if flames contact any log Ifso repositionlogaccordingto the log installation instructions in this manual Flames contact ing log will create soot It is very important to install these logs...

Page 16: ...causing property damage per sonal injury or loss of life A This appliance has a pilot which must be lighted by hand When lighting the pilot follow these instructions exactly B BEFORE LIGHTING smell a...

Page 17: ...0 seconds release control knob Note If pilot goes out repeat steps 3 through 7 If control knob does not pop out when released contact a qualified service person or gas supplier for repairs 8 Slightly...

Page 18: ...ols the heater will shut down If pilot flame pattern is incorrect as shown in Figure 22 turn heater off see To Turn Off Gas to Ap pliance page 17 see Troubleshooting page 20 Note The pilot flame on na...

Page 19: ...older located at the end of the burner tube again Remove any large particles of dust dirt lint or pet hair with a soft cloth or vacuum cleaner nozzle Figure 23 Injector Holder On Outlet Burner Tube Bu...

Page 20: ...on 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 OBSERVED PROBLEM When control knob is pressed in and turned t...

Page 21: ...act local natural or propane LP gas company 1 Contact local natural or propane LP gas company 2 Clean burner see Cleaning and Maintenance page 18 or replace burner orifice 1 Clean burner see Cleaning...

Page 22: ...burner 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 page 8 4 Clean burner see Cleaning and Maintenance...

Page 23: ...see Checking Gas Con nections page 14 1 Open window and or door for ventilation 2 Contact local natural or propane LP gas company 3 Clean ODS pilot see Cleaning and Maintenance page 18 1 Locate and c...

Page 24: ...uct If they can t supply original replacement part s call DESA Heating LLC at 1 866 672 6040 When calling DESA Heating LLC have ready your name your address model and serial numbers of your heater how...

Page 25: ...8 2195 KS MO AR 816 842 3911 www washerparts com East Coast Energy Products 10 East Route 36 W Long Branch NJ 07764 732 870 8809 1 800 755 8809 www njplaza com ecep 21st Century 2950 Fretz Valley Road...

Page 26: ...www desatech com 122136 01C 26 17 14 15 3 16 18 11 10 4 2 12 8 5 16 13 7 9 1 17 17 Parts Variable Manually Controlled HL18P HL18N VSB18P VSB18N HL24P HL24N VSB24P AND VSB24N...

Page 27: ...ith Ignitor LP 1 9 122141 01 Manual Valve Outlet Tube 1 10 122146 01 Natural Gas Plate 1 11 107186 05 Injector 1 107186 06 Injector 1 107186 07 Injector 1 107186 08 Injector 1 12 098354 01 Control Kno...

Page 28: ...proved by DESA Heating LLC Warranty parts must be obtained through authorized dealers of this prod uct and or DESA Heating LLC who will provide original factory replacement parts Failure to use origin...

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