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Unvented Gas Log Heater or
Vented Decorative Appliance
Models: 18HVFL, 24HVFL
Installation and
Operating Instructions
WARNINGS
If the information in this manual 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.
591016
18 24HVFL cover
This appliance may be installed in an aftermarket,
permanently located, manufactured (mobile)
home, where not prohibited by local codes.
This appliance is only for use with the type
of gas indicated on the rating plate. This
appliance is not convertible for use with other
gases.
This is an unvented gas-fired heater. It uses
air (oxygen) from the room in which it is
installed. Provisions for adequate combustion
and ventilation air must be provided.
Refer to Page 7.
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future refer-
ence.
59D1016 7/10 Rev. 5
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Table of Contents
Summary of Contents for HVFL 18HVFL
- Page 1 Unvented Gas Log Heater or Vented Decorative Appliance Models: 18HVFL, 24HVFL Installation and Operating Instructions WARNINGS 591016 If the information in this manual is not 18 24HVFL cover followed exactly, a fire or explosion may result causing property damage, personal injury or loss of life.
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Page 2: Table Of Contents
HVFL Unvented Gas Logs CONTENTS Thank you and congratulations on your purchase of an MHSC Log Set. PLEASE READ THE INSTALLATION AND OPERATION INSTRUCTIONS BEFORE USING THE APPLIANCE! IMPORTANT: Read all instructions and warnings carefully before starting installation. Failure to follow these instructions may result in a possible fire hazard and will void the warranty. -
Page 3: Important Safety Information
IMPORTANT SAFETY INFORMATION HVFL Unvented Gas Logs OWNER INSTALLER Please retain these instructions for future reference. Please leave these instructions with the appliance. • Any change to this heater or its controls can be dangerous. • Improper installation or use of the heater can cause serious injury or death from fire, burns, explosion or carbon monoxide poisoning. -
Page 4: Codes
IMPORTANT SAFETY INFORMATION HVFL Unvented Gas Logs The initial break-in operation should last two to three hours with the burner at the highest setting. Provide Never connect unit to private (non-utility) maximum ventilation by opening windows or doors to gas wells. This gas is commonly known allow odors to dissipate. -
Page 5: Product Features
PRODUCT FEATURES HVFL Unvented Gas Logs GAS SPECIFICATIONS IGNITION CONTROLS Max.Input Min. Input Piezo ignitor allows ignition of the pilot without the Model Fuel Control BTU/h BTU/h use of matches or batteries. 18HVFLNM Nat. Manual 8,000 18,000 Manual control has three (3) positions:... -
Page 6: Getting Started
HVFL Unvented Gas Logs GETTING STARTED • Handle the gas log burner assembly by the burner only. Do not pick the unit up by the burners. • Gloves are recommended when handling ceramic fiber logs to prevent skin irritation from loose fibers. Logs are fragile —... -
Page 7: Combustion And Ventilation Air
COMBUSTION and VENTILATION AIR HVFL Unvented Gas Logs ADEQUATE COMBUSTION AND VENTILATION AIR This heater shall not be installed in a confined space or unusually tight construction unless provisions are provided for adequate combustion and ventilation air. The National Fuel Gas Code, (ANSI Z223.1/NFPA54), defines a confined space as a space whose volume is less than 50 cubic feet per 1,000 BTU per hour (4.8 m... -
Page 8: Fireplace And Hearth Dimensions
IMPORTANT INFORMATION FOR THE ments as defined in their manual. INSTALLATION OF THIS GAS LOG SET The HVFL Series unvented room heater is approved for The following are guidelines for placing a gas log set in installation into the following unvented fireplaces:... -
Page 9: Clearances And Height Requirements
CLEARANCE and HEIGHT REQUIREMENTS HVFL Unvented Gas Logs The dimensions shown in Figures 4 through 12 and defined in the fireplace manufacturer's instructions are minimum clearances to maintain when installing this heater. Left and right clearances are determined when facing the front of the heater. -
Page 10: Installation Requirements
HVFL Unvented Gas Logs INSTALLATION REQUIREMENTS Heat resistant material (minimum requirements) with wooden mantel or other combustible projection: To install the heater with a wooden mantel, shelf or other combustible projection above, first measure the heat resis- tant material shown in Figure 6, then refer to Table B. - Page 11 INSTALLATION REQUIREMENTS HVFL Unvented Gas Logs The gas log heater must be installed at least 5" above any 12” combustible flooring material, such as carpeting or tile, 10” which is closer than 14" to the base of the fireplace. The 8”...
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Page 12: Installation
HVFL Unvented Gas Logs INSTALLATION BEFORE FULLY INSTALLING THE UNIT: DAMPER STOP INSTALLATION A damper stop must be provided with the unit. Contact your • Turn OFF the gas supply to the fireplace or firebox. dealer to obtain one. The damper stop must be installed as •... -
Page 13: Assembly Procedure
INSTALLATION HVFL Unvented Gas Logs ASSEMBLY PROCEDURE: CONNECT THE GAS 1. Center the gas log unit in the fireplace or firebox. Make NOTICE: A qualified gas appliance installer must connect certain the front feet of the grate sit inside the front edge the heater to the gas supply. -
Page 14: Check Gas Pressure
HVFL Unvented Gas Logs INSTALLATION MILLIVOLT CONTROL Connecting directly to an unregulated Figure 17 p r o p a n e / L P G t a n k c a n c a u s e a n The valve regulator controls the burner pressure which explosion. -
Page 15: Electrical Wiring (Millivolt)
ELECTRICAL WIRING - MILLIVOLT HVFL Unvented Gas Logs Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing. ODS Pilot On/Off Switch ODS Pilot Wall Switch Millivolt Valve... -
Page 16: Connect Remote Receiver
ELECTRICAL WIRING - MILLIVOLT HVFL Unvented Gas Logs CONNECT REMOTE RECEIVER INSTALL T-STAT SENSOR THESE INSTRUCTIONS SUPERCEDE THE SECTION OPTION SOLD SEPARATELY ENTITLED “HEARTH MOUNT” IN THE MILLI-VOLT 1. Remove metal bracket and label from box. HAND-HELD REMOTE INSTRUCTIONS SUPPLIED . - Page 17 8. Place thermo bulb in front of the firebox for incoming air. Wiring Harnesses Screw FP807 Knob T-Stat Sensor and Bracket Thermo Bulb Figure 22 - Install T-Stat Sensor to HVFL Base FP2807 Install tstat TP/TH Wiring Harnesses FP808 Figure 23 - Attach Wiring Harnesses to Control Valve FP2808...
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Page 18: Operation Of Thermostat Sensor
ELECTRICAL WIRING - MILLIVOLT HVFL Unvented Gas Logs OPERATION OF THERMOSTAT SENSOR 1. Follow millivolt lighting instructions on lighting plate attached to unit or in homeowner’s manual. . With control knob in the “ON” position make sure the ON/OFF switch is in the “OFF” position. Figure 3. -
Page 19: Rock Wool And Log Placement
ROCk WOOL and LOG PLACEMENT HVFL Unvented Gas Logs The positioning of the logs are critical to the safe and clean operation of this heater. Sooting and other problems may result if the logs are not properly and firmly positioned in the appliance. Never add additional logs or embellishments such as pine cones, vermiculite or rock wool to the heater. - Page 20 See Figure Right Log Cluster Figure 27 LG955 Top Center Log #4 LG955 HVFL SH left log cluster LG956 Figure 28 Pins 4. Rest end of top center log (#4) on rear log. Place front end of top center log LG956 where right and left cluster logs meet.
- Page 21 HVFL SP back log LG959 Figure 31 Pins LG959 3. Place left bottom log (#3) on pin located HVFL SP right bottom log on left side of base. Figure 32 Figure 32 LG960 59D1016 LG960 HVFL SP bottom left log...
- Page 22 Top Right Front Log #6 Front Log LG961 LG961 HVFL SP top mid right log 6. Place top right front log (#4) on top right back log and bottom right log. Figure 34 7. Place top left front log (#7) on rear log and bottom left log.
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Page 23: Flame Appearance
FLAME APPEARANCE HVFL Unvented Gas Logs DO NOT sprinkle volcanic rock on the logs, around the pilot, or on or near burners. This may cause sooting. Place volcanic rock only on the floor of the fireplace. During initial operation of the new heater, burning logs will give off a paper burning smell and orange flames will be present. - Page 24 HVFL Unvented Gas Logs FLAME APPEARANCE In normal operation at full rate after 15 minutes, the following flame appearances should be observed: LG964 Figure 38 - LG964 Stacked Pine Correct Rear Flame Appearance LG963 HVFL SM log flames Figure 37 -...
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Page 25: Operating Instructions
OPERATING INSTRUCTIONS HVFL Unvented Gas Logs OPERATING INSTRUCTIONS Avoid any drafts that alter burner flame patterns. Do not allow fans to blow directly into the fireplace. Do not place a blower inside the burn area of the firebox. Ceiling fans may create drafts that alter flame patterns. -
Page 26: For Your Safety Read Before Lighting
HVFL Unvented Gas Logs OPERATING INSTRUCTIONS FOR YOUR SAFETY, READ BEFORE LIGHTING If you do not follow these instruction exactly, a fire or explosion may result causing property damage, personal injury or loss of life. A. This appliance is equipped with a piezo ignition device which lights the pilot. If piezo is not working properly, refer to “Match Lighting”... -
Page 27: To Turn Off Gas To Heater
OPERATING INSTRUCTIONS HVFL Unvented Gas Logs MANUAL CONTROL LIGHTING INSTRUCTIONS 1. STOP! Read the safety information. . Make sure the manual shutoff valve is fully open. 3. This heater is equipped with an ignition device (piezo) which automatically lights the pilot. - Page 28 HVFL Unvented Gas Logs OPERATING INSTRUCTIONS MILLIVOLT CONTROL LIGHTING INSTRUCTIONS 1. STOP! Read the safety information label. . Make sure the manual shutoff valve is fully open. 3. This gas log set is equipped with an ignition device (piezo) which automatically lights the pilot. If piezo ignitor does not light the pilot, refer to instructions for Match Lighting Instructions, Page 26.
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Page 29: Match Lighting Instructions
OPERATING INSTRUCTIONS and CLEANING & SERVICING HVFL Unvented Gas Logs MATCH LIGHTING INSTRUCTIONS 1. Remove any items necessary for easy access to the pilot (for example: logs, screens, etc.). . Follow appropriate lighting instructions found previously. Instead of pushing and releasing the piezo button, light a match and hold the flame to the end of the pilot and ignite the pilot. -
Page 30: Troubleshooting
HVFL Unvented Gas Logs TROUBLESHOOTING Turn off appliance and allow to cool before NOTE: All troubleshooting items are listed in order of operation. cleaning. Only a qualified service person should service and repair the heater. Problem Possible Cause Solution When ignitor button is 1. - Page 31 TROUBLESHOOTING HVFL Unvented Gas Logs Problem Possible Cause Solution 1. Press in control knob fully. ODS/pilot lights, but flame 1. Control knob not fully pressed in. goes out when control . After ODS/pilot lights, keep control knob . Control knob not pressed in long knob is released.
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Page 32: Replacement Parts
HVFL Unvented Gas Logs REPLACEMENT PARTS 5 (Millivolt) 5 (Manual) Failure to position the parts in accordance 591015 HVFL parts with these diagrams or failure to use only parts specifically approved with this appliance may result in property damage or personal injury. -
Page 33: Accessories
REPLACEMENT PARTS HVFL Unvented Gas Logs HVFL 24HVFL Ref. Description Qty. Natural Propane Natural Propane Piezo Ignitor 14D0503 14D0503 14D0503 14D0503 Piezo Wire 00K063 00K063 00K063 00K063 Front Burner 59D0050 59D0050 59D0059 59D0059 Rear Burner 59D0058 59D0059 59D0051 59D0051 Manual Control... -
Page 34: Logs - Kentucky Stack
HVFL Unvented Gas Logs REPLACEMENT PARTS Seasoned Hardwood Logs Ref. Description Qty. 18HSHCL 24SHCL 30SHCL 591016 Back Log 59D138 59D148 59D158 18 24HVFL SH logs Right Log Cluster 59D130 59D140 59D150 Left Log Cluster 59D134 59D144 59D154 Top Center Log... -
Page 35: Logs - Split Maple
REPLACEMENT PARTS HVFL Unvented Gas Logs Stacked Pine Logs 591016 Ref. Description Qty. 18SPRL 24SPRL 30SPRL HVFL Stacked pine logs Back Log 59D1300 59D1307 59D1314 Right Bottom Log 59D1301 59D1308 59D1315 Left Bottom Log 59D130 59D1309 59D1316 Top Middle Log... - Page 36 HVFL Unvented Gas Logs 59D1016...
- Page 37 HVFL Unvented Gas Logs 59D1016...
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Page 38: Massachusetts Residents Only
HVFL Unvented Gas Logs Massachusetts Residents Only — Please read and follow these special requirements . Approved Carbon Monoxide Detectors. Each carbon NOTE REGARDING VENTED PRODUCTS monoxide detector as required in accordance with the above This product must be installed by a licensed plumber or gas fitter provisions shall comply with NFPA 70 and be ANSI/UL 034 when installed within the Commonwealth of Massachusetts. -
Page 39: Warranty
HVFL Unvented Gas Logs LIMITED LIFETIME WARRANTY LIFETIME WARRANTY The following components are warranted for life to the original owner, subject of proof of purchase: Firebox, Combustion Chamber, Heat Exchanger, Grate, and Stainless Steel Burners. FIVE YEAR WARRANTY The following components are warranted for 5 years to the original owner, subject of proof of pur- chase: Vent Free Ceramic Fiber Logs and Aluminized Burners. - Page 40 MHSC 149 Cleveland Drive • Paris, Kentucky 40361 www.mhsc.com...
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