I bought a house with an old lennox pulse furnace and am. The lennox pulse utilizes a forced draft blower to begin the sequence of operation. This the first part of the lennox pulse g21 gas furnace troubleshoot. Since this is a pulse furnace you may not get a steady reading, if your meter has an averaging feature it helps. Copper gas line condensate leak at furnace exhaust. They bought them from other people, and they are mostly standard items which are available. This thing is a garage heater without much ductwork and i notice the exit pipe from the finned. Eight models for natural gas and lpg are available with the introduction of capacity 40 000 60 000 people, of which 80 000 and 100 000 btuh.
Application lennox g21 series gas furnaces are available in eight models natural gas or lpgpropane with input capacities of 40,000, 60,000, 80,000 and 100,000 btuh 11. Cl50rooftopiom0409e lennox have been providing environmental solutions since 1895, our range of baltic tm rooftop continues to meet the standards that have made lennox a household name. Lennox pulse furnace comes on intermittently tech support guy. All flash code sequences are broken by a 2 sec ond off period. The risk with an lennox pulse is much more dangerous than the consolidated furnace issue, yet what makes the lennox pulse furnace less dangerous is that it had safety devices and the issue rarely happened. The plumbing installation must comply with local plumbing or waste water codes where applicable. Lennox hvac owners and servicers community forum to get all answers regarding lennox oem parts and more. Repairing servicing lennox gas furnaces pulse 21 shut down new topic reply to topic printer friendly. Oct 09, 2006 lennox gc 1 primary control 18 to 35 microamps dc.
If the control sets for 1 hour an does not go through a retry for ignition the control is bad. The low pressure, after the hot fumes have left the combustion area high pressure, will open the gas valve and it will let new gas in is air sucked in the same way. Units operate on the pulse combustion principle and do not require conventional pilot burner, main burners, flue or chimney. For those with lennox furnaces without the pulse 21 name, the next step is to remove the front door and look for the name tag. Single side return air with optional return air base 3. The furnace looks like new from all that i can see, but the condenser unit looks like a crappy weathered 1987 lennox builders model. I hit the offon toggle switch next to the furnace in the basement off, then immediately on and the furnace started running. When i call for heat the furnace clicks a couple of relays but never creates heat. I bought a house with an old lennox pulse furnace and am getting conflicting information about it. Law suits, carbon monoxide are just a couple of the subjects associated with the older pulse furnace. Lockout may be manually reset by removing power from the control for more than 1 second or removing the thermostat call for heat for more than 1 and less than 20 seconds. Heater starts and runs normally for approximately 1 2 minutes ignition shuts down. Blower motor i think hum lennox pulse 21 heating unit 1 answers hi im in a new home and turned on the furnace for the first time a lennox pulse 21, fairly new by the looks of it. The repair technician said that pulse 21 furnace has not been officially pulse 21, model 60,btu, high efficiency furnaces, may be the house actually responds to the thermostat.
If the temperature in the area of the gas valve cools down as much it would for 1 hour without heat and without. Lennox international came into being in 1895 when founder dave lennox invented, manufactured and marketed the worlds first rivetedsteel furnace. Perfect replacement part for my pulse 21 and whisper quiet too. Need guidance, my pulse 21 keeps shutting down unexpectedly and will only restart after power is shut off and back on. Jan 18, 2011 i have a lennox pulse 21 furnace that was installed in 1993. Lennox pulse furnace fails to remain started 1 answers i have a lennox g21 pulse furnace installed in 1993. That said, lennox will no longer make most of the critical parts for these furnaces. The repair technician said that pulse 21 furnace has not been officially pulse 21, model 60,btu, high efficiency furnaces, may be the house. On one call they replaced a flapper, and on the other call did the pressure test, which passed. Jan 21, 20 this the first part of the lennox pulse g21 gas furnace troubleshoot.
Your pulse furnaces are from a time when it was not good to own a pulse. Lennox did have major major problems, and noise wasnt the big problem, it was a life and. The collective years of hvac experience and the knowledge our forum members share make this an invaluable resource for those in the hvac industry. The blower operates for 30 seconds to clear the combustion chamber through the air flapper valve. Download lennox pulse furnace gsr 21q350 1 thermostat wiring diagram. I have a lennox pulse 21 furnace installed around 1996 or so. Lennox did not make their own controls, relays, electric motors, etc. Lennox pulse is one of the examples of the types available. Would i expect to have problems with a lennox pulse. Lennox pulse furnace gsr 21q350 1 thermostat wiring diagram. The johnson ignition control green led flashes when it is a 1 hour lockout. At that point, a spark is initiated in the combustion chamber. Baso bgn8911c module for lennox 60j00 pulse furnaces.
Modern day high efficiency furnaces monitor a variety of conditions before, during and after the combustion process. Baso bgn891 1 lennox pulse 60j00 ignition control module bgn8911c. Hyper supremacy 4 by spenny free listening on soundcloud. Service g21gsr21 unit information industries limted corp. The lennox pulse was yet another furnace made in the 1980s.
The unit we have is an 80, btu lennox pulse 21 model. Baso replacement ignition control board for lennox pulse. Lennox furnace furnace blower not running repair parts. Hello all, lennox is finally giving in on the pulse units. I have a lennox pulse 21 furnace that was installed in. Pulse furnace and am getting conflicting information about it. Now first let me say i am a pulse furnace fan, they are pretty neat units.
In g14 a series of impulses of combustion gas flow furnace provides up to 97%efficiency. Here, in part two of repair, we have removed the loose wire from the furnace and are now showing you the next steps towards repair. First, make sure that power is getting to the motor. This pattern will be repeated the number of times equal to the code. Today, lennox international manufactures a line of gas, oil and electric furnaces for residential customers in the united states. Mar 25, 2009 i have a pulse 2 or pulse 21 lennox furnace. He told me that lennox will give me a brand new furnace for free, all i have to do is pay for installation. Lenox pulse 21 mfg date 1993 g21q480 1 new flame sensor, and air intake flapper installed. Also pull the rubber cap off the end of the drip leg on the vent pipe and clean out any debris.
One day the house was down to 55f and the gas furnace never came on. Note the difference in the electric circuit for the g14 and gsr14. I have always read the fan speed should be on low for heating and high for cooling. To identify a pulse furnace, look for its name on the door. The spark operates for 8 seconds to start the combustion. So basically red wire is plugged to heating and brown, yellow are on park 1 and park 2. Oct 21, 2007 welcome to hvacproforums, an interactive community exclusively for hvac professionals. Lennox pulse furnaces g14, and g21 series general info fyi. I havent yet pressure tested it, or checked the gas pressures. I have a lennox pulse 21 furnace that was installed in 1993. After looking at the heat exchanger, he told me there was green corrosion and subject to lennox s recall.
Jun 14, 2015 since i feel like it, im going to post a little about the top two most dangerous furnaces that were made since 1975. The blower motor blows air through the return vent, past the heat exchanger, and into the homes venting. Model g21q380 1 sn 5892b00853 1992, as i read it the unit seems to run fine but with a slight stutter. Lennox pulse furnace gsr 21q3501 thermostat wiring diagram. Save lennox pulse 21 to get email alerts and updates on your ebay feed. If the furnace is unable to achieve ignition for a call for heat, or if an unsafe condition is detected, the furnace. Single side return air with transition, to accommodate 20 x 25 x 1 in. Furnace lockout mode reset help the last thing anyone wants to deal with, when it is bitterly cold outside, is a furnace that stops working. For example, six on flashes equals a number 6 fault code. However, i open the lennox manual and noticed it had a chart diagram for fan speed and readfor my unit model 48c1153 showed black wire high for cooling and brown. Led will turn on for 1 4 second and off for 1 4 second.
Gas furnace fault or error codes for common furnaces. Its simple to reset a lennox furnace and have it working again in seconds. Get the lowest prices on lennox 17j65 orifices everyday at, home to over 500,000 hvac parts at the lowest cost. Gas furnace fault or error codes for common furnaces gray. If the unit is a pulse 21 furnace, it was manufactured after 1990 and is not part of the inspection program. Do a search on your furnaces, you will read some nightmare stories on these units. I had to replace my gas valve last year, only the second time the furnace has failed in 23 years. It was inspected a few weeks ago by the home inspector and passed, but i didnt notice anything at that time. Condensation line appears to work fine, no blockage. The most common problems i have had on these units are blocked condensate lines, exhaust recirculating into the intake, and primary control failures. Before 1975, some furnaces did not incorporate thermocouples and did not have a combination gas valve, so if your pilot went out, the gas would continue running. The control will still respond to an open limit and undesired flame. You are right, the combustion is self sustaining thank carrie bean and ace. The unit will start to pulse briefly maybe 5 seconds or so, and then shut off.
Ignition control shows steady green light for approximately 56 minutes, during which it makes clicking sounds every 1 2 minutes. Fan speed colored wires are also different departments. Lennox gray furnaceman furnace troubleshoot and repair. I have never had any service work done on this pulse furnace since its been installed. Light is green on board, after several tries the light blinks. Com electronically controlled motor icm1 icm2 page 1 1998 lennox industries inc. Dec 06, 20 my lennox pulse 21 quit working early november. I have a lennox pulse 21 that starts and stops and doesnt. At the time, i had two different companies come and inspect the hvac system.
This video is part of the heating and cooling series of training videos made to accompany. Lennox pulse furnaces g14, and g21 series general info. Jan 11, 2007 what is the lennox pulse 21 heat exchanger recall. For troubleshooting procedures, lennox pulse furnaces are shown in fig.
It worked flawlessly for a few days that it happened again. Furance fan speed on lennox help terry love plumbing. There is an aftermarket ignition control for these, made by baso bgn891. There is a standpipe made, and when the furnace is running, there is a gurgling sound coming from this pipe. The last thing anyone wants to deal with, when it is bitterly cold outside, is a furnace that stops working. Unfollow lennox pulse 21 to stop getting updates on your ebay feed. Lennox 64l80a replacement flapper for pulse furnace. Lennox pulse 1 58 outlet air flapper housing plastic lb65081. At the end of the 1 hour it should go through another trial for ignition. Personally i think it is a water problem blocking either the inlet or outlet. Then, as combus tion products pass through the heat exchanger system. Initially, combustion takes place in an enclosed chamber.
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