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Vanguard MDVFST Owner's Operation And Installation Manual

Direct-vent gas fireplace
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DIRECT-VENT GAS FIREPLACE
OWNER'S OPERATION AND INSTALLATION MANUAL
This fireplace meets
the construction and
safety standards of
H.U.D. for application
in mobile homes when
installed according to
these instructions.
This appliance is
shipped ready for natural
gas installation. The
propane/LP conversion
parts are included.
MDVFST (See Thru) fireplace with manual variable blower, ON/OFF hand-held remote control,
electrical junction box, gas flex line and equipment shutoff valve.
WARNING: If the information in these instruc-
tions is not followed exactly, a fire or explosion
may result causing property damage, personal
injury, or loss of life.
— Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or 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.
• Immediately call your gas supplier from a
neighbor's phone. Follow the gas supplier's
instructions.
• If you cannot reach your gas supplier, call the
fire department.
— Installation and service must be performed by a
qualified installer, service agency, or the gas
supplier.
This appliance may be installed as an OEM installation in a manufactured (mobile) home and must
be installed in accordance with the manufacturer's instructions and the Manufactured Home
Construction and Safety Standard, Title 24 CFR, Part 3280 in the United States or the Mobile Home
Standard, CAN/CSA Z240 MH Series, in Canada.
This appliance is only for use with the type of gas indicated on the rating plate. A conversion kit is
supplied with the appliance.
CHECK LOCAL CODES PRIOR TO INSTALLATION
Save this manual for future reference.
®
SAVE THIS BOOK
This book is valuable. In addition to instructing
you on how to install and maintain your appli-
ance, it also contains information that will
enable you to obtain replacement parts or
optional accessory items when needed. Keep
it with your other important papers.
WARNING: Improper installation,
adjustment, alteration, service, or
maintenance to this appliance can
cause injury or property damage.
Refer to this manual. For assistance
or additional information consult a
qualified installer, service agency,
or the gas supplier.
WARNING: This direct-vent gas fire-
place series is intended for use with
Natural or Propane/LP gas only. Do
not attempt to burn any solid fuels
in these appliances.

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Summary of Contents for Vanguard MDVFST

  • Page 1 The propane/LP conversion parts are included. MDVFST (See Thru) fireplace with manual variable blower, ON/OFF hand-held remote control, electrical junction box, gas flex line and equipment shutoff valve. WARNING: If the information in these instruc- tions is not followed exactly, a fire or explosion may result causing property damage, personal injury, or loss of life.

  • Page 2: Glossary Of Terms

    Surround RIGHT SIDE (3cm) (57cm) 32 (81cm) (Opening) (110cm) Figure 1 - MDVFST (See Thru) Dimensions Note: All dimensions in this manual are in inches unless otherwise specified. GLOSSARY OF TERMS - A boxlike enclosure to protect Chase venting from the elements when the venting run is on the outside of a structure.

  • Page 3: Selecting Location

    SELECTING LOCATION To determine the safest and most efficient location for your appliance, consider the following guidelines: 1. The location must allow for proper clearances (see Clearances). 2. Consider a location where heat output would not be affected by drafts, air con- ditioning ducts, windows, or doors.

  • Page 4: General Venting

    ® MDVFST DIRECT-VENT GAS FIREPLACE PRE-INSTALLATION PREPARATION Continued MANTEL CLEARANCES Woodwork, such as wood trims, mantels, and other combustible materials projecting no more than 1 inches (3.8cm) shall not be placed within 7 inches (17.8cm) from the opening of the unit. Combustible material...
  • Page 5 GENERAL VENTING Continued LOCATION OF VENT TERMINATION When locating vent termination, it is important to observe the minimum clearances shown in Figure 10. You will avoid extra framing by positioning your fireplace against an already existing framing member. The sides of the fireplace may be positioned directly against combustible walls. *Check with local codes or with the current CAN/CGA B149 [.1 or .2] Installation Codes for Canada or the USA Installations follow the current National Fuel Gas Code, ANS Z223.1, also known as NFPA 54.

  • Page 6: Venting Installation

    ® MDVFST DIRECT-VENT GAS FIREPLACE VENTING INSTALLATION WARNING: Read all instruc- tions completely and thoroughly before attempting installation. Fail- ure to do so could result in serious injury, property damage or loss of life. Operation of improperly in- stalled and maintained venting sys- tem could result in serious injury, property damage or loss of life.
  • Page 7 VENTING INSTALLATION Continued INSTALLATION FOR HORIZONTAL TERMINATION 1. Determine the route your horizontal venting will take. Note: The location of the horizontal vent termination on the exterior wall must meet all local and national building codes and must not be easily blocked or obstructed. WARNING: Do not recess vent terminal into a wall or siding.
  • Page 8 ® MDVFST DIRECT-VENT GAS FIREPLACE VENTING INSTALLATION Continued 3. Attach vent pipe assembly to the fire- place. Set fireplace in front of it’s per- manent location to insure minimum clearances. Mark the wall for a 10" square hole (for noncombustible ma-...
  • Page 9 VENTING INSTALLATION Continued Horizontal Termination Configurations Figures 18 through 20 show different con- figurations for venting with horizontal termi- nation. Each figure includes a chart with vertical minimum/maximum and horizontal maximum dimensions which must be met. All connections must be sealed with high temperature silicone sealant (outer pipe only) as specified in the second warning statement on page 6.

  • Page 10: Installation For Vertical Termination

    ® MDVFST DIRECT-VENT GAS FIREPLACE VENTING INSTALLATION Continued INSTALLATION FOR VERTICAL TERMINATION NOTICE: Use rigid pipe only. Flex venting is NOT to be used with a vertical termination. Determine the route your vertical vent- ing will take. If ceiling joists, roof rafters,...

  • Page 11: Installation

    VENTING INSTALLATION Continued 2. Cut the hole 1/8" larger than the sup- port box outline (see Figure 23, page 11). 3. Lower the support box through the hole in the roof until the bottom of the box extends at least 2" below the ceiling (see Figure 23).
  • Page 12 ® MDVFST DIRECT-VENT GAS FIREPLACE VENTING INSTALLATION Continued 45 Starter Elbow Flue Restrictor Venting with Two 90 Elbows Vertical (V 5' min. 6' min. 7' min. 8' min. Note: Vertical (V Vertical (V Figure 27 - Vertical Rigid Venting Configuration Using Two 90 Elbows Horizontal (H) 6' max.

  • Page 13: High Altitude Installation

    Consult your local gas company to help de- termine the proper orifice for your location. For assistance with any high altitude installa- tion contact DESA International’s Technical Service Department at 1-800-DESA-LOG (1-800-337-2564). PARTS LISTS FOR VENTING KITS AND COMPONENTS Note: Terminations are not designed for installation prior to transportation.

  • Page 14: Blower Assembly

    Magnets Figure 32 - Blower Speed Control WALL SWITCH INSTALLATION Since the MDVFST model uses a valve that operates on millivolt current generated by the pilot, a wall switch (not included) may be used to activate the gas control valve without the use of normal household elec- tricity.
  • Page 15 INSTALLATION Continued Gas Valve 16AI Route Millivolt Wires (Supplied) Through Gas Line Conduit Sleeve Figure 34 - Wall Switch Wiring Diagram Note: If any of the original wire supplied must be replaced, use type 18 AWG-105 degree C (25 feet length MAXIMUM) or equivalent. ELECTRICAL HOOKUP FOR BLOWER ACCESSORY Before blower accessory can be operated, it...

  • Page 16: Gas Line Hookup

    ® MDVFST DIRECT-VENT GAS FIREPLACE INSTALLATION Continued GAS LINE HOOKUP WARNING: Before you pro- ceed, make sure your gas supply is OFF. WARNING: Gas line hookup should be done by your gas sup- plier or a qualified service person. An equipment shutoff valve has been in- cluded in the appliance’s gas supply system.
  • Page 17 INSTALLATION Continued GAS SUPPLY TESTING Note: This section is intended as a guide for qualified service technicians installing gas to the appliance. CAUTION: Do not connect appliance before pressure test- ing gas piping. Damage to the gas valve may result and an un- safe condition may be caused.

  • Page 18: Pilot Assembly Adjustment

    ® MDVFST DIRECT-VENT GAS FIREPLACE INSTALLATION Continued DECORATIVE FACING Any noncombustible material may be used for facing (glass, tile, brick, etc.) as long as the proper clearances are observed (see Clearances, page 3). IMPORTANT: Lou- vered openings must not be obstructed, and upper and lower panels must remain remov- able for servicing.

  • Page 19: Operating Fireplace

    OPERATING GUIDELINES AND MAINTENANCE INSTRUCTIONS Continued CAUTION: If the glass breaks, be cautious of fragments on the floor. Keep children away from the area. Do not operate the unit. Use proper safety gloves to re- move the broken glass door. Dis- card safely.

  • Page 20: Wiring Diagram

    ® MDVFST DIRECT-VENT GAS FIREPLACE OPERATING FIREPLACE Continued TO TURN OFF GAS TO APPLIANCE Turn off remote control or wall switch. 2. Turn off all electric power to the ap- pliance if service is to be performed. 3. Remove control access panel.

  • Page 21: Installation Instructions

    INSTALLATION INSTRUCTIONS FOR CONVERSION NATURAL TO PROPANE/LP WARNING: This conversion kit shall be installed by a quali- fied service agency in accordance with the manufacturer instruc- tions and all applicable codes and requirements of the author- ity having jurisdiction. If the in- formation in these instructions is not followed exactly, a fire, ex- plosion, or production of carbon...

  • Page 22: Adjusting Air Shutter

    ® MDVFST DIRECT-VENT GAS FIREPLACE INSTALLATION INSTRUCTIONS FOR CONVERSION NATURAL TO PROPANE/LP Continued The SIT Nova millivolt valve converts from natural gas to propane/LP gas with the re- versal of the conversion screw located on the stem in the top of the valve (see Figure 58).

  • Page 23: Troubleshooting

    TROUBLESHOOTING Note: For additional help, visit DESA International’s technical service web site at www.desatech.com. Note: Before troubleshooting the system, make sure the equipment shutoff valve is ON. OBSERVED PROBLEM Pilot will not light No gas to burner, although wall switch and...
  • Page 24 ® MDVFST DIRECT-VENT GAS FIREPLACE TROUBLESHOOTING Continued OBSERVED PROBLEM When ignitor button is pressed, there is spark at pilot but no ignition Pilot lights but flame goes out when control knob is released Burner does not light after pilot is lit...
  • Page 25 TROUBLESHOOTING Continued OBSERVED PROBLEM Glass soots Fireplace produces a clicking/ticking noise just after burners are lit or shut off WARNING: If you smell gas • Shut off gas supply. • Do not try to light any appliance. • Do not touch any electrical switch; do not use any phone in your building. •...

  • Page 26: Service Hints

    TECHNICAL SERVICE You may have further questions about in- stallation, operation, or troubleshooting. If so, contact DESA International’s Technical Service Department at 1-800-323-5190. You can also visit DESA International’s technical services site www.desatech.com. REPLACEMENT PARTS Note: Use only original replacement parts.
  • Page 27 REPLACEMENT PARTS Continued PILOT ASSEMBLY Natural - 105883-01 (25701) Propane/LP - 105883-02 (25702) If in need of replacing, have a qualified technician replace it. Front (Bottom) Left/Right (Bottom) Rear (Used for Peninsula and See-Thru) Front (Used for See-Thru Only) REFRACTORY PIECES Front (Bottom) 105886-01 (25854) Left/Right (Bottom)

  • Page 28: Warranty Information

    We make no other warranty, expressed or implied. DESA International warrants this product to be free from defects in materials and components for four (4) years from the date of first purchase, provided that the product has been properly installed, operated and maintained in accordance with all applicable instructions. To make a claim under this warranty the Bill of Sale or cancelled check must be presented.

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