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114924-01B

6

CHECK GAS TYPE

Use the correct gas type (natural or propane/LP) for 

your unit. If your gas supply is not correct, do not 

instal in fireplace. Call dealer where you bought 

the appliance for proper type of appliance.

  WARNING:  This  appliance 

is equipped for (natural or pro-

pane/LP) gas. Field conversion 

is not permitted.

INSTALLATION AND CLEARANCES

Figure 2 shows technical information regarding 

the installation of your gas log set. Please make 

sure all specifications shown are applicable before 

installation is attempted.

LOG SIZING REQUIREMENTS

 

MINIMUM FIREBOX SIZE

LOG 

 

 

FRONT  REAR* MIN. FLUE

SIZE  HEIGHT  DEPTH  WIDTH  WIDTH 

 SIZE

18" 

20" 

14" 

25"  20.5" 

6.5"

24" 

20" 

14" 

29"  24.5" 

6.5"

*Measured at 14" depth

Figure 4 - Attaching Damper Clamp 

Manufactured 

Fireplace

Masonry 

Fireplace

Damper

Damper 
Clamp

Damper

Damper 
Clamp

Damper

VENTING SPECIFICATIONS FOR 
INSTALLATION

The fireplace chimney flue and vent must be draft-

ing properly. To check the vent for proper drafting: 

Light a tightly rolled newspaper on one end and 

place it at the inside front edge of the fireplace. 

INSTALLATION

Continued 

SPECIFICATIONS (W.C.)

 

FUEL INLET   

MANIFOLD

 

PRESSURE   

PRESSURE

 

Min.  Max. 

NG 

7" 

10.5" 

3.5"

LP 

11" 

14" 

10"

FLUE OPENING SPECIFICATIONS

Note:

 This vented appliance must be installed only 

in a solid-fuel burning or UL127 factory-built fire-

place constructed of noncombustible material and 

connected to a working flue. The fireplace chimney 

must have a permanent vent opening to outside 

with minimum openings shown in Figure 3.

Figure 2 - Technical Information Chart

Figure 3 - Sizes and Clearances

Valve Bracket

INSTALLING REMOTE CONTROL 
ACCESSORY BRACKET

If installing optional remote control accessory you 

will need to install the remote accessory bracket 

for the receiver. 
Use screws provided to attach bracket to valve 

bracket as shown in Figure 5.
Follow  installation  instructions  included  with 

remote accessory.

Figure 5 - Attaching Remote Bracket to 

Valve Bracket

Remote 
Bracket

Observe the smoke and be sure the vent is properly 

drawing it up the chimney. If the smoke spills out 

into the room, extinguish the flame and remove any 

obstruction until proper venting is achieved.
The chimney flue damper must be fixed open to pro-

vide a minimum of 32 square inch of free air opening 

at all times during operation of the log set. A damper 

clamp is included to secure the damper.
The minimum flue sizes shown in Figure 3 are 

based on a 6' chimney height using round pipe. Your 

minimum flue size will vary based on input rate and 

chimney height. Refer to the 

National Fuel Gas Code 

ANSI Z223.1/NFPA 54, Section 6.6 

for details.

INSTALLING DAMPER CLAMP

Secure the damper stop clam to the edge of the 

damper as shown in Figure 4. If for any reason 

this clamp doesn't work on your fireplace, another 

suitable clamp or permanent stop must be installed, 

or the damper blade must be cut or removed.

Summary of Contents for Firewerks MVO18VNA

Page 1: ...any other appliance WHAT TO DO IF YOU SMELL GAS Do not try to light any appliance Do not touch any electrical switch do not use any phone in your building Immediatelycallyourgassupplierfromaneighbor...

Page 2: ...s ANSI Z233 1 NFPA 54 Section 5 3 Air for Combustion and Ventilation This appliance may be installed in an aftermarket per manently located manufactured mobile home where not prohibited by local codes...

Page 3: ...though no odor exists Make certain you read and understand all warnings Keep this manual for reference It is your guide to safe and proper operation of this log set WARNING Do not place log scraps or...

Page 4: ...en in place and fully closed Unless provided by other means screens shall have openings for introduction of combustion air 8 If replace has glass doors never operate with glass doors closed If you ope...

Page 5: ...ot to be used with vented decorative appliances INSTALLATION WARNING A quali ed ser vice person must install heater Follow all local codes WARNING Before installing in a solid fuel burning replace the...

Page 6: ...re place constructed of noncombustible material and connected to a working ue The replace chimney must have a permanent vent opening to outside with minimum openings shown in Figure 3 Figure 2 Technic...

Page 7: ...read inlet connection to the control valve CAUTION Never connect propane LP unit directly to the propane LP supply This unit re quiresanexternalregulator not supplied Install the external regulator be...

Page 8: ...is not installed or is installed wrong heater may not run properly CAUTION Avoid damage to gas control Hold gas control with wrench when connecting it to gas piping and or ttings Figure 7 Gas Connect...

Page 9: ...oints Propane LP Gas Only Figure 10 Checking Gas Joints Natural Gas Only Equipment Shutoff Valve Gas Meter Control Valve Location Pressure Testing Appliance Gas Connections 1 Open equipment shutoff va...

Page 10: ...been under water LIGHTING INSTRUCTIONS 1 STOP Read the safety information col umn 1 2 Make sure switch is in OFF position 3 Be sure gas line shut off valve is OPEN 4 Press in and turn control knob clo...

Page 11: ...hand held remote was on when selector switch was last turned off You can now turn the burner on and off with the hand held remote control unit OPERATING APPLIANCE Continued Figure 13 Setting the Sele...

Page 12: ...attern Yellow Flames with Orange Streaks CLEANING AND MAINTENANCE WARNING Turn off the ap pliance and allow to cool before cleaning CAUTION You must keep control areas burners and cir culating air pas...

Page 13: ...in gas lines when in stalled 5 Depleted gas supply pro pane LP only 6 ODS pilot is clogged 7 Gas regulator setting is in correct When ignitor button is pressed there is no spark at ODS pilot When igni...

Page 14: ...page 11 1 Contact local natural or propane LP gas company 2 Clean burner s see Cleaning and Maintenance page 12 1 Clean burner see Cleaning and Maintenance page 12 or replace burner ori ce 2 Replace d...

Page 15: ...ate burners 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 6 4 Clean burners see Cleaning and Mainte...

Page 16: ...nding while heating or contracting while cooling 1 Appliance burning vapors from paint hair spray glues cleaners chemicals new carpet etc See IMPORTANT statement above 2 Low fuel supply propane LP onl...

Page 17: ...lit burners will have delayed ignition propane LP gas supply may be low You may feel your gas pressure is too low If so contact your local propane LP or natural gas supplier TECHNICAL SERVICE You may...

Page 18: ...www desatech com 114924 01B 18 ILLUSTRATED PARTS BREAKDOWN MVO24VNA MVO24VPA MVO18VNA MVO18VPA 1 2 3 4 5 6 17 16 15 7 8 9 10 11 12 14 13...

Page 19: ...1 111807 02 111807 01 111807 02 Valve 1 10 112376 01 103778 01 112376 01 103778 01 Pilot Assembly 1 11 111828 01 111818 01 111828 01 111828 01 Brass Fitting 2 12 114930 02 114930 02 114930 01 114930 0...

Page 20: ...The heater MUST be installed by a quali ed 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 conditi...

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