How change a Marco Fireplace from wood burning to gas logs
We have a Marco #792775D fireplace that was installed when the house was built. It has only had hard wood fires in it. We want to change over to gas logs. We are redoing the refractory and have had the chimney and flue cleaned and inspected. We want to know how and where, to install the gas outlet/ fireplace valve. Does it have knock outs for the gas lines? We have no manual. Is there one available for it or pictures with any of this info?
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by C Care - Cited by 2 - Related articles
your fireplace heater, please contact Crane. Customer ... This instruction manualapplies to the following models of the Fireplace Heaters product line: Color.
Now that's a LOT of additional information. I hesitated to answer your question the way it was worded originally.... IF in fact it is a masonry chimney and originally built to burn wood, you should have a chimney sweep do a thorough inspection of the flue to ensure it is safe to use again. Flue temperatures, while burning wood, EASILY exceed 1200 degrees whereas natural gas flue temps are in the 450 degree range.
It also should have a clay tile liner and not be fabricated of brick only. The unsafe thing of an unlined brick chimney or a chimney with a severely cracked liner has to do with unburned gases condensing within the inner surfaces of the chimney. Some of those gases are moist and will condense on the inner surface and eventually have an unsafe build up that can be ignited by an oversized flame or excessive sparks causing a flue fire. During a flu fire, temperatures exced 2000 degrees and an unlined BRICK flue of that age could have lost some mortar allowing superheated gasses to seep into the crevices. Those superheated gasses then explode when igniged by the flue fire and either do extreme damage to the flue, blow the entire chimney apart or in the worst case scenario burn your house down.
I'm sure you've seen houses burnt and the chimney was left standing....but you have also seen damaged houses with the chimneys blown off the end of the house and laying in rubble toppled out into the yard. The latter visual picture was an example of the end result of the gasses exploding. If the chimney was inside the house instead of on the end of the house, the house would have been burnt also.
There is a lot to be careful about when heating with wood and to start off safely you need to have your chimney inspected and the gas components removed with the gas line capped EXTERNAL of the fireplace.
My name is mike. YOU DO NOT want to attempt to burn wood in a gas fireplace. The reason for it, is the venting is not designed for the fumes and high heat the wood produces. Only way you can safely burn wood, in a gas fireplace is have to make sure the piping and venting is set up correct to burn wood. Your problem is not most likely your stove or fireplace for the safety, it would be your venting. Thanks Mike
when the gas logs were installed the vent damper should have disabled. it sounds like this was done.it is unsafe to close the damper with gas piped into the fire place. sometimes a "u" block will be placed over the damper blade. if the gas has been removed and not piped into the firebox anymore it would be safe to remove this
Ok, I have a Marco Model 792775D. I am renting the house and there is no manual for it. How would I use it. Is it supposed to be fake logs or is it for real logs. The land lord said he didnt know if it works. I need a manual for it. PLEASE HELP!!!
I have a Model 792864B. Before you attempt to light the pilot light - make sure that any wall control switch or remote control for the fireplace is in the off position. Locate the gas supply line. There should be a gas supply valve to turn on the gas supply. The valve is usually painted a different color than the supply line like blue, green or yellow. Open the valve by pivoting the handle to be parallel to the gas line, usually counter-clockwise. When it is closed it is at a 90 degree angle from the supply line. Locate the pilot light assembly - this is the pilot light. There should also be a red or black ignitor button and a black or green valve control knob with the words "on" "off" and "pilot" on it. It may be located inside a black box, mine is marked heatolator, that has a lift off top. Lift off the top of the box. Push in the valve control knob and turn it until the word "pilot" is in line with the arrow (my arrow is red) or indicator line. While pressing and holding in the valve control knob - it presses in about 1/4", press the red or black ignitor button repeatedly (once per second) until the pilot ignites. Once the pilot is lit, continue to hold the valve knob in for about 30 seconds and then slowly release. The pilot should remain lit. If it remains lit, press in and turn the valve control knob to the "on" position. The on/off wall or remote control switch should now light your fireplace. If the pilot doesn't ignite, turn off gas supply valve, wait about 5 minutes and try it again.