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CAUTION: 

Two gas line installations at the same 

time are prohibited. The access plate to the 
switching means shall not be opened while the 
heater is in operation. 

 

WARNING:

 This appliance is for installation 

in a solid-fuel burning masonry or UL 127 factory 
build fireplace or in a listed vent less firebox 
enclosure. It has been design certifies for these 
installations. Exceptions: DO NOT install 
appliance in a factory build fireplace that includes 
instructions stating it has not been tested or 
should not be used with unvented gas logs. 

 

1. This heater shall not be installed in a room or 
space unless the required volume of indoor 
combustion air is provided by the method 
described in the 

National Fuel Gas Code,

 ANSI 

Z223.1/NFPA 54, the 

International Fuel Gas 

Code, 

or applicable local codes. 

2. Do not place Propane/LP supply tank(s) inside 
any structure. Propane/LP supply tank(s) must 
be placed outdoors. 
 
3. This heater shall not be installed in the place 
which the strong wind would shut down the 
appliance. 
 
Air ducts and/or ash dumps in the fireplaces shall 
be permanently closed at time of appliance 
installation.   

 

4. This heater needs fresh air ventilation to run 
properly. This heater has an Oxygen Depletion 
Sensing (ODS) safety shutoff system. The ODS 
shuts down the heater if not enough fresh air is 
available. See Air for Combustion and Ventilation, 
page 8. If heater keeps shutting off, see 
troubleshooting. 
 
5. Keep all air openings in front and bottom of 
heater clear and free of debris. This will ensure 
enough air for proper combustion. 
 
6. If heater shuts off, do not relight until you have 
provided fresh air from outside. If heater keeps 
shutting off, have it serviced. 
 
7. Do not run heater where flammable liquids or 

vapors are used or stored under dusty 
conditions. 
8. Before using furniture polish, wax, carpet 
cleaner, or similar products, turn heater off. If 
heated, the vapors from these products may 
create a white powder residue within burner box 
or on adjacent walls or furniture. 
 
9. Always run heater with control knob at 
PILOT/IGN, LOW or HIGH locked positions. 
Never set control knob between locked positions, 
otherwise poor combustion and higher levels of 
carbon monoxide may be resulted. 
 
10. Do not use this room heater if any part has 
been under water. Immediately call a qualified 
service technician to inspect the room heater and 
to replace any part of the control system and any 
gas control which has been under water. 
 
11. Turn off and let heater cool down before 
servicing. Only a qualified service person should 
service and repair heater. 
 
12. Periodic visual check of pilot and burner 
flame, with pictorial sketches or drawings. 
 
13. The appliance must be isolated from the gas 
supply piping system by closing its equipment 
shut-off valve during any pressure testing of the 
gas supply piping system at test pressures equal 
to or less than 1/2 psi (3.5 kPa). 
 

Important Note: 

  An unvented room heater having an input 

rating of more than 10,000 Btu/hr (2,931 
W) shall not be installed in a bedroom or 
bathroom; or 

  An unvented room heater having an input 

rating of more than 6000 Btu/hr (1,758 W) 
shall not be installed in a bathroom. 

 

 
 
 
 
 

Summary of Contents for GLDF18T-VF

Page 1: ...some of our most popular products without requiring any adjustments Our product lines consist of vent free gas wall heaters a direct vent gas wall heater line kerosene and propane forced air heaters...

Page 2: ...reen must be in place when the appliance is operating and unless other provisions for combustion air are provided the screen shall have an opening s of introduction of combustion air WARNING Keep the...

Page 3: ...clear and free of debris This will ensure enough air for proper combustion 6 If heater shuts off do not relight until you have provided fresh air from outside If heater keeps shutting off have it ser...

Page 4: ...ff system The ODS pilot shuts off the heater if there is not enough fresh air PULSE IGNITION SYSTEM This heater is equipped with a battery powered electric pulse igniting system No AC power supply req...

Page 5: ...priate for heater location The Air Shutter is pre set for Liquid Propane use If using Natural Gas see Air Shutter section of manual Unit successfully tested o Installed by Company ____________________...

Page 6: ...ompare parts with package contents list and diagram above If any part is missing or damaged do not attempt to assemble install or operate the product Contact customer service for replacement parts Bef...

Page 7: ...roximately one 1 ounce 30 ml of water for every 1 000 BTUs 0 3 KWs of gas input per hour Unvented room heaters are recommended as supplemental heat a room rather than a primary heat source an entire h...

Page 8: ...f the aggregate input rating of all appliances installed in that space Rooms connecting directly with the space in which the appliances are installed through openings not furnished with doors are cons...

Page 9: ...61 000 BTU Hr The space in the prior example is a confined space because the actual BTU hr used is more than the maximum BTU hr the space can support You must provide additional fresh air Your options...

Page 10: ...quired size of ventilation grills or ducts Ventilation Air from Outdoors Provide extra fresh air by using ventilation grills or ducts You must provide two permanent openings one within 12 inches of th...

Page 11: ...er creates warm air currents These currents move heat to wall surfaces next to heater Installing heater next to vinyl or cloth wall coverings or operating heater where impurities such as tobacco smoke...

Page 12: ...tible material other than wood flooring the appliance shall be installed on a metal or wood panel extending the full width and depth of the appliance Installing Damper Clamp Remove all ashes or other...

Page 13: ...e log set is important as it improves the color and appearance of the flame The Air Door is located on the bottom of the log set heater So you will need to flip it over I recommend laying a cloth down...

Page 14: ...lide any further Once done you will tighten the screw on the cylinder then seal the air shutter cover again For more information please visit our website www thermablaster com You can contact us at 87...

Page 15: ...burner holes as this can lead to sooting and an overall drop in the performance of your heater Logs should be placed sequentially from lowest to highest as the numbering indicates There are grooves on...

Page 16: ...supply This heater requires an external regulator not supplied Install the external regulator between the heater and gas supply CAUTION Avoid damage to regulator Hold gas regulator with wrench when co...

Page 17: ...1 Disconnect heater with its appliance main gas valve control valve and equipment shutoff valve from gas supply piping system Pressures in excess of 1 2 PSIG will damage heater regulator 2 Cap off ope...

Page 18: ...WHAT TO DO IF YOU SMELL GAS Open the window or door immediately Do not try to light any appliance Do not touch any electric switch do not use any phone in your building Immediately call your gas supp...

Page 19: ...is should be done slowly in one motion without stopping between positions Knob will only turn if you have a stable pilot light the heater will now operate normally 5 Adjust the Control Knob to your de...

Page 20: ...20 Figure 10 Control Panel Figure 11 Pilot System Figure 12 Pilot Blue Flame...

Page 21: ...bly clean and free of dust and dirt To clean these parts we recommend using compressed air no greater than 30 PSl Your local computer store hardware store or home center may carry compressed air in a...

Page 22: ...your gas supplier call the fire department IMPORTANT Operating heater where impurities in air exist may create odors Cleaning supplies paint paint remover cigarette smoke cements and glues new carpet...

Page 23: ...when control knob is released Both control and igniter knobs are not fully pushed down Thermocouples are not heated enough External shutoff valve of gas supply is not fully opened Thermocouple connec...

Page 24: ...urning vapors from paint hair spray glues etc See IMPORTANT statement Gas leak See Warning Statement Low fuel supply Ventilate room Stop using odor causing products while heater is running Locate and...

Page 25: ...25 ILLUSTRATED PARTS Model GLDF18T VF...

Page 26: ...5 Bottom Strengthen strip No 2 12 NG Nozzle 36 Bottom Strengthen strip No 1 13 Air door washer 37 Air door shield 14 Air door rod 38 Sensor bulb bracket 15 Air door 39 Thermostat elbow 16 Burner 40 Th...

Page 27: ...ce Performed Service Date Please register your product online at www thermablaster com or send in the registration form below to our office at Reecon North America 2515 Liberty Ave Pittsburgh PA 15222...

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