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116986-01B

4

1.  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. 

2.  Do not place propane/LP supply tank(s) in

-

side any structure. Locate propane/LP supply 

tank(s) outdoors (propane/LP units only).

3.  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 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 supplier, call 

the fire department

4.  This heater shall not be installed in a bedroom 

or bathroom.

5.  Before installing in a solid fuel burning fire

-

place, the chimney flue and firebox must be 

cleaned of soot, creosote, ashes and loose paint 

by a qualified chimney cleaner. Creosote will 

ignite if highly heated. Inspect chimney flue 

for damage. If damaged, repair flue before 

operating heater.

6.  Do not burn solid-fuel in a masonry or UL127 

factory-built fireplace in which a vent-free 

room heater is installed.

7.  If fireplace has glass doors, never operate this 

heater with glass doors closed. 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, follow the 

instructions in 

Cleaning and Maintenance

page 19.

9.  Before using furniture polish, wax, carpet 

cleaner or similar products, turn heater off. If 

heated, the vapors from these products may 

create a white powder residue within burner 

box or on adjacent walls or furniture.

10.  This heater needs fresh, outside air ventilation to 

run properly. This heater has an oxygen depletion 

sensing (ODS) pilot light safety system. The 

ODS shuts down the heater if not enough fresh 

air is available. See 

Air for Combustion and 

Ventilation

, page 5. If heater keeps shutting off, 

see 

Troubleshooting

, page 21.

11.  Do not run heater

•  where flammable liquids or vapors are 

used or stored

•  under dusty conditions

saFeTy INFoRMaTIoN

Continued

12.  Do not use this heater to cook food or burn 

paper or other objects.

13.  Do not use heater if any part has been exposed 

to or under water. Immediately call a qualified 

service technician to inspect the room heater 

and to replace any part of the control system and 

any gas control which has been under water. 

14.  Do not operate heater if any log is broken. Do 

not operate heater if a log is chipped (dime-

sized or larger). 

15.  Turn heater off and let cool before servicing 

or repairing. Only a qualified service person 

should install, service or repair heater.

16.  This heater does not need to be connected to 

any external electrical source.

17.  To prevent performance problems, do not 

use propane/LP fuel tank of less than 100 lb. 

capacity (propane/LP units only).

18.  Operating heater above elevations of 4,500 

feet could cause pilot outage.

19. Provide  adequate  clearances  around  air 

openings.

State  of  Massachusetts:

  The  installa-

tion must be made by a licensed plumber 

or  gas  fitter  in  the  Commonwealth  of

 

Massachusetts.
Sellers  of  unvented  propane  or  natural 

gas-fired supplemental room heaters shall 

provide to each purchaser a copy of 527 

CMR 30 upon sale of the unit.
Vent-free  gas  products  are  prohibited  for 

bedroom  and  bathroom  installation  in  the 

Commonwealth of Massachusetts.

PRodUCT 

IdeNTIFICaTIoN

Figure 1 - Product Identification

Hand-Held 
Remote Control Chassis 

Assembly

Control Valve 
with Remote 
Receiver 
Module

Log Set 
Assembly

Summary of Contents for Design Dynamics VF-18N-MHD

Page 1: ...pliance Do not touch any electrical switch do not use any phone in your building Immediatelycallyourgassupplierfromaneighbor s phone Follow the gas supplier s instructions If you cannot reach your gas...

Page 2: ...air oxygen from the room in which it is installed Provi sions for adequate combustion and ventilation air must be provided Refer to Air for Combustion and Ventilation section on page 5 of this manual...

Page 3: ...a to cause cancer or birth defects or other reproductive harm IMPORTANT Read this owner s manualcarefullyandcompletely before trying to assemble operate or service this heater Improper use of this hea...

Page 4: ...eaterneedsfresh outsideairventilationto runproperly Thisheaterhasanoxygendepletion sensing ODS pilot light safety system The ODS shuts down the heater if not enough fresh air is available See Air for...

Page 5: ...ystem requires no matches or other source to light log set Air For Combustion and Ventilation WARNING This heater shall not be installed in a confined space or unusually tight con struction unless pro...

Page 6: ...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 ceilin...

Page 7: ...ption 3 Figure 2 Follow the National Fuel Gas Code ANSI Z223 1 NFPA 54 Section 5 3 Air for Combustion and Ventilation for required size of ventilation grills or ducts Figure 2 Ventilation Air from Ins...

Page 8: ...WARNING Never install the heater in a bedroom or bathroom in a recreational vehicle where curtains furniture cloth ing or other flammable objects are less than 42 from the front top or sides of the he...

Page 9: ...Size Height Depth Front Width Rear Width 18 20 14 35 22 1 2 24 20 14 35 22 1 2 MINIMUM FIREPLACE CLEARANCE TO COMBUSTIBLE MATERIALS Log Size 18 or 24 Side Wall 16 Ceiling 42 Floor 5 Measured at 14 dep...

Page 10: ...Minimum Mantel Clearances When Using Hood Minimum Noncombustible Material 8 Min 12 15 18 All minimum distances are in inches 20 2 1 2 6 8 10 12 Distances to Underside of Mantel Hood GA6050 GA6052 or G...

Page 11: ...ht remove the mantel Floor Clearances A If installing appliance 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...

Page 12: ...ction Purchase the optional CSA design certified equipment shutoff valve from your dealer See Accessories page 25 For propane LP units the installer must supply an external regulator The external regu...

Page 13: ...Purchase the optional CSA design certified equipment shutoff valve from your dealer See Accessories page 25 Minimum inlet pressure for purpose of input adjustment Figure 12 Gas Connection 3 Minimum C...

Page 14: ...e LP gas or opening main gas valve located on or near gas meter for natural gas or using compressed air 3 Check all joints from gas meter to equipment shutoff valvefornatural gas or propane LPsup ply...

Page 15: ...ARNING If fireplace has glass doors never operate this heater with glass doors closed If you op erateheaterwithdoorsclosed heat buildup inside fireplace willcauseglasstoburst Make suretherearenoobstru...

Page 16: ...off with ON OFFswitch thus disabling the remote hand set Setting The Display C 24h and F 12h Press and hold OFF and until display changes from F and 12 hour clock to C and 24 hour clock or vice versa...

Page 17: ...gas Shutting Off Burner Only pilot stays lit Press to decrease the flame height and shut off main burner MANUAL LIGHTING Procedure WARNING Manual lighting mustbeperformedbyaqualified service person Th...

Page 18: ...r knob to adjust flame Knob has a slipping clutch that allows manual flame height adjustment to turn gas off to appliance Shutting Off Heater Press OFF button on remote control to switch off main gas...

Page 19: ...to keep the primary air opening s of theburner s cleanmayresultin sooting and property damage Burner Injector Holder Air Inlet Hole The primary air inlet holes allow the proper amount of air to mix w...

Page 20: ...he burner Figure 25 Injector Holder on Front Burner Tube Burner Tube Primary Air Inlet Opening Injector Holder Injector Figure 24 Removing Front Log to Clean Front Burner Main Log Assembly Front Log A...

Page 21: ...ssure is too low 2 Burner orifice s clogged OBSERVED PROBLEM When and arepressedat the same time there is no spark at ODS pilot When and are pressed there is spark at ODS pilot but no ignition Burner...

Page 22: ...and let warm up for a minute 2 Operate burner until air is removed from line Have gas line checked by local natural or propane LP gas company 3 Observe minimum installation clearances see page 9 4 Cl...

Page 23: ...artially clogged 4 Thermostat on remote is satisfied 1 Gas leak See Warning statement at top of page 2 Control valve or gas control defective 1 Foreign matter between con trol valve and burner 2 Gas l...

Page 24: ...F Switch Soldered Cable Thermocurrent Cable 1 Motor Knob MAN Knob troubleshooting Continued POSSIBLE CAUSE Battery nearly down When signal appears the first time ap proximately 10 ignitions left Cable...

Page 25: ...ct authorized dealers of this product If they can t supply original replacement part s call DESA s Technical Service Department at 1 866 672 6040 When calling DESA have ready your name your address mo...

Page 26: ...llustrated Parts Breakdown Models VF 18N MHD VF 18P MHD VF 24N MHD and VF 24P MHD 1 2 3 4 5 25 22 7 8 18 9 6 10 11 26 34 23 12 21 20 29 28 29 28 27 24 27 24 22 13 19 14 32 30 15 15 15 15 15 15 31 15 1...

Page 27: ...01 117004 01 117004 01 Pilot Shield 1 20 099918 03 099918 02 099918 03 099918 02 Burner Regulator 1 21 116957 01 111803 03 116957 01 Air Shutter 1 22 111824 01 111824 01 111824 01 111824 01 Nut Sleeve...

Page 28: ...d by a qualified installer in accordance with all local codes and instructions furnished with the unit This warranty does not apply to parts that are not in original condition because of normal wear a...

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