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114924-01D

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

LOG
SIZE

MINIMUM FIREBOX SIZE

HEIGHT DEPTH

FRONT

WIDTH

REAR*
WIDTH

MIN. 

FLUE

 SIZE

18"

20"

14"

25"

20.5"

.5"

24"

20"

14"

29"

24.5"

.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  

PRESSURE

MANIFOLD

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 (see Figure 5).

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.

For Massachusetts Residents Only

Installation of this vented gas log set in the Com

-

monwealth of Massachusetts requires the damper 

be permanently removed or welded in the fully 

open position.

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 MVO18VNA

Page 1: ...t any appliance 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...

Page 2: ...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 This a...

Page 3: ...nt even 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 sc...

Page 4: ...eans screens shall have openings for introduction of combustion air 8 If fireplace has glass doors never operate with glass doors closed If you operate heater with doors closed heat buildup inside fir...

Page 5: ...used with vented decorative appliances Installation WARNING A qualified ser vice person must install heater Follow all local codes WARNING Before installing in a solid fuel burning fireplace the chim...

Page 6: ...le 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 Si...

Page 7: ...ollow all local codes WARNING This appliance requiresa3 8 NPT NationalPipe Thread inlet connection to the control valve CAUTION Never connect propane LP unit directly to the propane LP supply This uni...

Page 8: ...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 fittings Figure 7 Gas Connection Purchasetheoptiona...

Page 9: ...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 valve s...

Page 10: ...tch is in OFF position 3 Be sure gas line shut off valve is OPEN 4 Press in and turn control knob clockwise to the OFFposition see Figure 12 Note Knob cannot be turned from PILOT to OFFunless knob is...

Page 11: ...Setting the Selector Switch Control Knob and Flame Adjustment Knob for Remote Operation Selector Switch in REMOTE Position REMOTE OFF ON Piezo Ignitor Control Knob Flame Adjustment Knob Figure 14 On...

Page 12: ...Pattern 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 pa...

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

Page 14: ...n burner s see Cleaning and Maintenance page 12 1 Clean burner see Cleaning and Maintenance page 12 or replace burner orifice 2 Replace damaged burner 3 Replace gas regulator 4 Correct external gas re...

Page 15: ...oved 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 Maintenance page 12 or replace bur...

Page 16: ...ding 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 only...

Page 17: ...will not stay lit burners will have delayed ignition Propane LPunits only propane LPgas supply may be low You may feel your gas pressure is too low If so contact your local propane LP or natural gas s...

Page 18: ...www desatech com 114924 01D 18 Illustrated Parts Breakdown Models MVO24VNA MVO24VPA MVO18VNA and MVO18VPA 1 2 3 4 5 6 17 16 15 7 8 9 10 11 12 14 13...

Page 19: ...01 Pilot Assembly 1 11 111828 01 Brass Fitting 1 111818 01 Brass Fitting 1 12 114930 01 Pilot Bracket 1 114930 02 Pilot Bracket 13 26205 Gas Orifice 1 23109 Gas Orifice 1 14 114936 02 Venturi 1 11493...

Page 20: ...installed 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 norm...

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