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121353-01F

7

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  heater  plus  any  adjoining  rooms  with 
doorless  passageways  or  ventilation  grills 
between the rooms.

1.  Determine the volume of the space (length 

x width x height).

 

Length x Width x Height = __________ c u . 
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 heater 

_________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 heater 

+ _________ 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)

40,000
33,000
73,000

 

Example:

  51,200  Btu/Hr  (maximum  the 

space can support)

 

73,000  Btu/Hr  (actual  amount  of  Btu/Hr 

used)

The space in this 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

.

B.  Vent  room  directly  to  the  outdoors.  See 

Ventilation Air From Outdoors, 

page 8.

C.  Install a lower Btu/Hr heater, 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  ceiling  and  one  within  12"  of  the  floor 
on the wall connecting the two spaces (see 
options 1 and 2, Figure 2, page 8). 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.

AIR FOR COMbUSTION AND VENTILATION

Continued

Summary of Contents for FLAME-MAX VYM27NR

Page 1: ...you cannot reach your gas supplier call the fire department Installation and service must be performed by a quali fied installer service agency or the gas supplier UNVENTED VENT FREE GAS LOG HEATER O...

Page 2: ...t 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 Aftermarket Completion of sale...

Page 3: ...g fans can create drafts that alter burner flame patterns Altered burner patterns can cause sooting Due to high temperatures the appliance should be located out oftrafficandawayfromfurniture and drape...

Page 4: ...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 supplie...

Page 5: ...Application These multisided logs are designed to be equally beautiful when viewed from any angle They are designed specifically for use in see through peninsula and island fireboxes with multiple op...

Page 6: ...sidered a part of the unconfined space Adjoining rooms are communicating only if there are doorless passageways or ventilation grills between them There are 4 optional controls that can be pur chased...

Page 7: ...pace can support _______ Btu Hr actual amount of Btu Hr used 40 000 33 000 73 000 Example 51 200 Btu Hr maximum the space can support 73 000 Btu Hr actual amount of Btu Hr used The space in this examp...

Page 8: ...attic will activate the power vent NOTICE Thisheater isintended for use as supplemental heat Use this heater along with your primary heating system Do not install this heater as your pri mary heat so...

Page 9: ...tural gas or propane LP gas but not both Gas type is indicated on the rat ingplate Fieldconversionisnot permitted INSTALLATION Continued INSTALLATION AND CLEARANCES Vent Free Operation Only WARNING Ma...

Page 10: ...for minimum clearances IMPORTANT If you cannot meet these mini mum clearances you must operate heater with chimney flue damper open Go to Install ing Damper Clamp Accessory for Vented Operation page 1...

Page 11: ...op of Fireplace Opening Underside of Mantel Shelf Mantel Shelf 12 A 18 20 22 24 All minimum distances are in inches 2 1 2 6 8 10 Figure 7 Minimum Mantel Clearances When Using Hood Minimum Noncombustib...

Page 12: ...nce on the floor level 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 abov...

Page 13: ...ble material Make sure material is secure CAUTION Do not pick up heater base assembly by the burner This could damage heater Only handle base as sembly by grates IMPORTANT Make sure the heater burner...

Page 14: ...pplied Install the exter nalregulatorbetweentheheater and propane LP supply Figure 13 External Regulator With Vent Pointing Down Propane LP gas only Propane LP Supply Tank External Regulator with Vent...

Page 15: ...uipment Shutoff Valve With 1 8 NPT Tap Approved Flexible Gas Hose if allowed by local codes Pipe Tee Nipple Cap Joint Sediment Trap Natural Gas From Gas Meter 5 W C to 10 5 W C Pressure Propane LP Gas...

Page 16: ...iance main gas valve control valve and equip ment shutoff valve from gas supply piping system Pressures in excess of 1 2 psig will damage heater regulator 2 Cap off open end of gas pipe where equip me...

Page 17: ...ylog If so reposition logs according to the log installation instructions in this manual Flames contact ing logs will create soot It is very important to install the logs exactly as instructed Do not...

Page 18: ...whentheselectorswitch is in the ON position after the pilot is lit 4 Press in and turn control knob clockwise to the OFF position FOR YOUR SAFETY READ BEFORE LIGHTING WARNING If you do not fol low the...

Page 19: ...release control knob If control knob does not pop out when released contact a qualified service person or gas supplier for repairs Note If pilot goes out repeat steps 4 through 8 9 Slightly push in an...

Page 20: ...ctor switch to the REMOTE position see Figure 25 Note The burner may light if hand held re mote was on when selector switch was last turned off You can now turn the burner on and off with the hand hel...

Page 21: ...held remote in the AUTO mode close to the fireplace The radiant heat from the fireplace will turn off the fireplace Ideally place the hand held remote in the center of the room facing towards the fir...

Page 22: ...rn off heater and let cool Remove blockage blocked burner flame holes will create soot Burner FLAME PATTERN Figure 30 shows a correct burner flame pat tern Figure 31 shows an incorrect burner flame pa...

Page 23: ...ollow the directions on the can If you don t follow directions on the can you could dam age the pilot assembly 1 Shut off unit including pilot Allow unit to cool for at least thirty minutes 2 Inspect...

Page 24: ...OT position 3 Control knob not pressed in while in PILOT position 4 Air in gas lines when in stalled 5 Depleted gas supply pro pane LP gas 6 ODS pilot is clogged 7 Gas regulator setting is not correct...

Page 25: ...position 1 Manifold pressure is too low 2 Burner orifice clogged 1 Burner orifice is clogged or damaged 2 Damaged burner 3 Gas regulator defective REMEDY 1 Press in control knob fully 2 After ODS pilo...

Page 26: ...et cleaners etc may turn into white powder residue 1 Battery is not installed Bat tery power is low 1 Metal expanding while heating or contracting while cooling REMEDY 1 Check burner for dirt and debr...

Page 27: ...ee Checking Gas Con nections page 15 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 23 1 Locate and cor...

Page 28: ...ter how heater was malfunctioning purchase date Usually we will ask you to return the part to the factory Parts Not Under Warranty Contact authorized dealers of this product If they can t supply origi...

Page 29: ...OL KIT HRC200 Allows the fireplace to be operated in a manu ally or thermostatically controlled mode You can turn the fireplace on and off without ever leaving the comfort of your easy chair A wall mo...

Page 30: ...w desatech com 121353 01F 30 Parts Models VYM27NR and VYM27PR 5 1a 1b 1c 9 3 2 13 12 15 14 18 17 12 12 16 21 12 19 6 8 7 4 11 12 20 10 9 23 22 Note Part numbers 22 and 23 are for natural gas model onl...

Page 31: ...ator to Pilot 1 099387 13 Pilot Tube Regulator to Pilot 1 10 103781 01 Gas Control Valve 1 103781 02 Gas Control Valve 1 11 104611 01 Lower Bracket 1 12 098304 01 Screw 8 x 0 38 7 13 Painted Base Asse...

Page 32: ...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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