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114924-01B

7

INSTALLATION

Continued 

INSTALLING APPLIANCE

  WARNING:  Special  care  is 

required if you are installing the 

unit into a sunken fireplace. You 

must raise the fireplace floor to 

allow access to gas log controls. 

This  will  insure  adequate  air 

flow and guard against sooting. 

Raise  the  fireplace  floor  using 

noncombustible material.

 CAUTION: Do not pick up ap-

pliance assembly by logs. This 

could damage unit. Only handle 

assembly by grate.

IMPORTANT: 

Make sure appliance is level. If 

unit is not level it will not work properly.
Center the appliance in the fireplace. Make certain 

the grate front feet sit inside the front edge of 

the fireplace and that there is adequate clearance 

around the appliance for access and operation.

Note:

 The installation of appliances designed for 

manufactured home (U.S. only) or mobile home 

installation must conform with the standard 

CAN/

CSA Z240, Mobile Housing

, in Canada, or with 

the 

Manufactured Home Construction and Safety 

Standard, Title 24 CFR, Part 3280

, in the United 

States, or when such a standard is not applicable,

 

ANSI/NCSBCSA225.1/NFPA501A, Manufactured 

Home Installations Standard

.

CONNECTING TO GAS SUPPLY

 WARNING: A qualified service 

person must connect heater to gas 

supply. Follow all local codes.

  WARNING:  This  appliance 

requires a 3/8" NPT (National Pipe 

Thread)  inlet  connection  to  the 

control valve.

  CAUTION:  Never  connect 

propane/LP unit directly to the 

propane/LP supply. This unit re-

quires an external regulator (not 

supplied).  Install  the  external 

regulator between the unit and 

the propane/LP supply.

 WARNING: Never connect natu-

ral gas fireplace to private (non-util-

ity) gas wells. This gas is commonly 

known as wellhead gas.

Installation Items Needed

Before installing heater, make sure you have the 

items listed below.
•  approved flexible gas hose and fittings (supplied 

with appliance -if allowed by local codes)

•  external regulator (propane/LP models only)
•  piping (check local codes)
•  sealant (resistant to propane/LP gas)
•  equipment shutoff valve*
•  test gauge connection*
•  sediment trap
•  tee joint
•  pipe wrench
* A CSA design-certified equipment shutoff valve 

with 1/8" NPT tap is an acceptable alternative to 

test gauge connection. Purchase the optional CSA 

design-certified equipment shutoff valve from your 

dealer. See 

Accessories

, page 17.

For propane/LP units, the installer must supply 

an external regulator. The external regulator will 

reduce incoming gas pressure. You must reduce 

incoming gas pressure to between 11 and 14 inches 

of water. If you do not reduce incoming gas pres-

sure, control valve damage could occur. Install 

external regulator with the vent pointing down as 

shown in Figure 6. Pointing the vent down protects 

it from freezing rain or sleet.

Propane/LP 
Supply Tank

External 
Regulator

Vent 
Pointing 
Down

Figure 6 - External Regulator with Vent 

Pointing Down

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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