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www.desatech.com

116986-01B

5

loCal Codes

Install and use heater with care. Follow all local 

codes. In the absence of local codes, use the lat

-

est edition of 

The National Fuel Gas Code ANSI 

Z223.1/NFPA 54

*.

*Available from:

American National Standards Institute, Inc.

1430 Broadway

New York, NY 10018

National Fire Protection Association, Inc.

Batterymarch Park

Quincy, MA 02269

UNPaCkING

 CAUTION: Do not remove the 

data  plates  from  the  grate  as

-

sembly. The data plates contain 

important  warranty  and  safety 

information.

1.  Remove  log  set  assembly  from  carton.

 

Note:

 Do not pick up assembly by logs. This 

could damage heater. Always handle assembly 

by grate.

2.  Remove all protective packaging applied to 

log set for shipment.

3.  Check all items for any shipping damage. If 

damaged, promptly inform dealer where you 

bought heater.

PRodUCT FeaTURes

OPERATION

This heater is clean burning. It requires no outside 

venting. There is no heat loss out a vent or up a 

chimney. Heat is generated by realistic flames and 

glowing ceramic logs/coals. This heater is designed 

for vent-free operation with flue damper closed. It has 

been tested and approved to ANSI Z21.11.2 standard 

for unvented heaters. State and local codes in some 

areas prohibit the use of vent-free heaters.

SAFETY PILOT

This heater has a pilot with an Oxygen Deple

-

tion Sensing (ODS) 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.

REMOTE IGNITION AND CONTROL

This gas log set has a battery powered electronic 

remote ignition and control. This system 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 provisions are 

provided for adequate combus

-

tion and ventilation air. Read the 

following instructions to insure 

proper  fresh  air  for  this  and 

other  fuel-burning  appliances 

in your home. 

Today’s homes are built more energy efficient 

than ever. New materials, increased insulation and 

new construction methods help reduce heat loss 

in homes. Home owners weather strip and caulk 

around windows and doors to keep the cold 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 enter 

your home. All fuel-burning appliances need fresh 

air for proper combustion and ventilation.

Exhaust fans, fireplaces, clothes dryers and fuel 

burning appliances draw air from the house to 

operate. You must provide adequate fresh air for 

these appliances. This will insure proper venting 

of vented fuel-burning appliances.

PROVIDING ADEQUATE 
VENTILATION 

The following are excerpts from 

National Fuel 

Gas Code, ANSI Z223.1/NFPA 54, Section 5.3, 

Air for Combustion and Ventilation

.

All spaces in homes fall into one of the three fol

-

lowing ventilation classifications:

1.  Unusually Tight Construction

2.  Unconfined Space

3.  Confined Space

The information on pages 5 through 7 will help you 

classify your space and provide adequate ventilation. 

Unusually Tight Construction

The air that leaks around doors and windows may 

provide enough fresh air for combustion and ven

-

tilation. However, in buildings of unusually tight 

construction, you must provide additional fresh air.

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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