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116986-01B

14

INsTallaTIoN

Continued

4.  Check all joints from equipment shutoff valve 

to control valve (see Figure 14 or 15). Apply 

noncorrosive leak detection fluid to all joints. 

Bubbles forming show a leak.

5.  Correct all leaks at once.

6.  Light heater (see 

Operating Heater, 

page 15). 

Check all other internal joints for leaks.

7.  Turn off heater (see 

To Turn Off Gas to Appli-

ance

, page 18).

Figure 13 - Equipment Shutoff Valve

Open

Closed

Equipment 
Shutoff Valve

Figure 15 - Checking Gas Joints for 

Propane/LP Gas

Control Valve Location

Propane/LP 
Supply Tank

Equipment Shutoff Valve

Figure 14 - Checking Gas Joints for 

Natural Gas

Gas Meter

Equipment Shutoff Valve

Control Valve 
Location

4.  Check all joints of gas supply piping system. 

Apply noncorrosive leak detection fluid to all 

joints. Bubbles forming show a leak. 

5.  Correct all leaks at once.

6.  Reconnect  heater  and  equipment  shutoff 

valve to gas supply. Check reconnected fit

-

tings for leaks. 

Test Pressures Equal To or Less Than 
1/2 PSIG (3.5 kPa)

1.  Close equipment shutoff valve (see Figure 13).

2.  Pressurize supply piping system by either 

opening propane/LP supply tank valve for 

propane/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 valve for natural gas or propane/LP sup

-

ply to equipment shutoff valve for propane/LP 

(see Figure 14 or 15). Apply noncorrosive leak 

detection fluid to all joints. Bubbles forming 

show a leak. 

4.  Correct all leaks at once.

PRESSURE TESTING HEATER GAS 

CONNECTIONS

1.  Open equipment shutoff valve (see Figure 13).

2.  Open main gas valve located on or near gas 

meter for natural gas or open propane/LP 

supply tank valve.

3.  Make sure control knob of heater is in the OFF 

position.

Place Lava Rock and 
Small Decorative 
Logs in Front of 
Burner

Place 
Glowing 
Embers 
on Burner 
Ports

Figure 16 - Placement of Embers and 

Lava Rock 

ADDING EMBERS, LAVA ROCK AND 
DECORATIVE LOGS

The effect of glowing embers is created by placing 

ember material on the front burner. 

1.  Make sure the heater is OFF and has cooled 

if it has been running.

2.  Gently remove embers from the bag using 

gloves or tweezers (recommended to prevent 

skin irritation). Separate the pieces.

3.  Place ember pieces, one at a time, over ports 

on flat burner (see Figure 16). 

Do NOT place 

ember material anywhere else on the unit. 

Use only ember material supplied with unit (12 

one inch square pieces). Excessive ember mate

-

rial may produce carbon monoxide or soot.

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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