Lennox Pulse® Furnace Frequently Asked Questions
How do I know if I have a Lennox Pulse furnace?
Lennox Pulse furnace models begin as follows:
G14, GSR14, G21, GSR21, G21V
Example: G14Q3-80, G21Q4/5-100
How old is my Lennox Pulse furnace?
Serial numbers (located on the inside cabinet of the furnace) are read as follows.
5887A10566 = 1987 A= January
5892B14555 = 1992 B= February
[Ignore the first two digits and determine the year by the 3rd & 4 th digits.]
Why should I have my Lennox Pulse furnace tested?
All furnace systems should have regular preventative maintenance. Poorly maintained equipment may not only be operating inefficiently but unsafely as well. Any combustion system can produce carbon monoxide when burning poorly. Carbon monoxide is introduced into the home when a poorly burning furnace is combined with a faulty flue and/or substantially cracked or breached heat exchanger.
What exactly is the warranty on my Lennox Pulse furnace?
Labor warranties are issued by the installing dealer. White Heating warrants its workmanship for one (1) year commencing from installation. Extended labor warranties may be purchased within (10) months of the original installation date. Parts warranties other then the main burning chamber (heat exchanger) are normally one (1) or five (5) years depending upon the model purchased. Both labor and parts warranties are expired for the Pulse as the last produced units are now over five years. The heat exchanger carried a limited-lifetime warranty. The following is a direct transcript of the written Lennox warranty.
Covered equipment and covered components are warranted by Lennox for a period of one (1) year from the date of the original unit installation for a period of one (1) year from the date of the original installation when installed in commercial, industrial or institutional applications. Lifetime heat exchanger warranty applies to the original equipment purchaser, subject to proof of purchase, and is not transferable. Lifetime heat exchanger warranty reverts to twenty (20) year warranty for subsequent owners and in commercial applications.
Lennox will furnish a replacement heat exchanger or allow a credit (in the amount of the suggested heat exchanger selling price) toward the purchase of an equivalent Lennox furnace (at the current suggested unit selling price), if a replacement heat exchanger is no longer available.
How is the heat exchanger warranty being honored now that heat exchangers are no longer available?
Lennox will credit the installing Lennox dealer the cost of a 90% AFUE gas furnace towards the new Lennox furnace installation. The cost of installation labor and materials (gas pipe, wiring, plastic PVC pipe and fittings, duct alterations) are included in the final cost quote presented to the homeowner for review. The current 90% AFUE Lennox gas furnace is the G51MP series. Upgrades to 94% AFUE furnaces incorporating innovative two-stage gas valves and modulating blower systems are available. The difference in the 90% unit and the upgrade are the responsibility of the homeowner. Our proposals will generally offer several choices from within the furnace product line.
What is involved in a Pulse heat exchanger pressure test?
Exact testing procedures are set by Lennox Industries Inc. White Heating follows these steps to the letter. Basically, the plastic PVC intake and exhaust pipes are cut and the furnace system sealed with specific plug devices. The system is then pressurized with air to ten (10) times the operating level of the furnace. Should the system lose all pressure within the ten (10) minute test cycle then the unit is considered failed. Both the main chamber and the secondary coil are tested via the same procedure. The furnace piping is then reconnected and the system restarted and tested for proper operation.
Why should I consider changing my furnace if I have the pressure test performed and the unit fails the test?
A leaking chamber will only worsen over time. While the furnace may continue to operate for years to come and present no immediate safety concern a “no heat” situation may occur as a result of a neglected heat exchanger situation. Should a heat exchanger failure progress to the point of a ‘no heat’ condition a new furnace will be required. It is better to address the issue at an opportune time rather than during an emergency such as severe weather and off hours when dealers cannot respond as promptly as desired.
There is also an economic reason to consider should the replacement option be available to you as the homeowner. Are you considering updating the cooling equipment, installing a new humidifier or air cleaner/indoor air quality device? The cost to do so is normally reduced when purchased at the same time the furnace is being replaced. White Heating incorporates labor discounts when multiple items a selected for installation by the same crew on the same date. What should I do if the furnace fails the pressure test?
The furnace will be left in operating condition, as our intent is never to leave you as the homeowner in a difficult position. If you elect to obtain a free estimate, a date may be scheduled between yourself and our sales representative to measure and discuss furnace options. The servicing technician will answer any questions you may have however the actual costs involved are determined by our estimation-sales department.
What is the cost of the test and what if I elect to replace the furnace?
The cost of the pressure test is $175.00 and includes all materials needed to reconnect the unit once the test is complete. Test costs are reduced to $100.00 each for multiple units installed within the same residence. The cost of the test(s) will be credited against the new installation should you elect to have us replace the furnace.
Can any service company perform the Pulse pressure test?
Only authorized Lennox dealers with a valid Lennox account can purchase and process the necessary claim papers.
How is the combustion process on a Pulse furnace different from other furnace systems?
The combustion process of the Pulse operates similar to an engine whereby a spark plug ignites a mixture of gas and air within a sealed custom designed chamber. Air from your duct/blower system passes over the sealed chamber and picks up the heat produced by the process. A secondary coil (fin/tube assembly) also extracts additional heat from the process. Most other furnaces contain individual burners with standing pilots or intermittent ignitor controls. The Pulse furnace is uniquely different from the standard open blue flame burner recognized as common in many homes.
What are the safety factors built into the Lennox Pulse furnace?
The Pulse furnace operates as a combustion engine mixing “pulses” of gas and air together multiple times a second. Should the air-gas mixture be substantially interrupted the Pulse may then ‘lockout’ and result in a no heat situation. Pressure switches, flame sensors and electronic components are designed to monitor the combustion process. The Pulse furnace also contains the standard high limit safety and fused controls incorporated into many gas furnaces in the market. While the Pulse has many safety features this should not be considered a reason not to buy a home CO detector or not to have regular preventative maintenance. What about other repair parts specific to the Lennox Pulse furnace?
Primary ignition controls, purge-ventor motors, spark plugs, sensors, limits and relays are readily available to Lennox dealers. Tune-up kits are currently being packaged by Lennox to facilitate recommended maintenance procedures. Please select only reputable Lennox dealers when choosing a service agency, as specific knowledge is required to properly service the Lennox Pulse furnace.
What was the Lennox Pulse ® Furnace Inspection Program from the late 1990’s and how is that different from this current 2005 program?
Lennox Industries Inc. initiated a Pulse Furnace Heat Exchanger testing & inspection program in the late 1990’s for all Pulse furnaces with an installation date prior to 1990. Units manufactured 1990 and more recent were not part of the program. The program was implemented nationwide and was performed by authorized Lennox dealers. Notification of the homeowner was provided to those who returned their original warranty cards and through installing dealers. White Heating mailed letters to all Pulse owners within our installation/service database and documented any who responded. It was a voluntary program developed by Lennox to evaluate the condition of the heat exchanger on units in operation for a period of time. The program was not a “recall” as others in the related industries have erroneously referred to that program. The program ended in 1999.
White Heating offers our program as part of suggested other than annual maintenance procedures specific to the Pulse furnace. It is not to be considered an extension of the original Lennox nationwide program, which was a manufacturers program, now since expired.
What if I already had an inspection through the original 1990’s Lennox National Program?
Lennox Industries recommends that a pressure test be conducted every four (4) years. Again, this is an optional test but is encouraged to assure a safe and efficient appliance.
Why is not the pressure test conducted during my regular furnace maintenance provided by White Heating?
The pressure test is comprehensive and would significantly add to the basic general service call cost. White Heating always performs a carbon monoxide test during any standard general furnace maintenance call to identify any condition that represents a safety issue. White Heating does conduct a pressure test when a Pulse furnace fails not as a result of any replaceable control but specifically due to a failed chamber as determined by our technician. The test verification enables us to implement the furnace replacement option described in this document.
What assurances do I have that the tests are performed properly and the cost quotes are fair and competitive?
All failed heat exchangers must be returned to the local Pittsburgh Lennox warehouse for retesting by Lennox personnel thus insuring the integrity of the program. Should a dealer send a passing chamber to Lennox that dealer will back charged the cost of the replacement furnace. White Heating stands by its testing procedure and will always credit the furnace cost against your new installation should we determine the unit to have failed.
We trust you will consider our cost quotes to be fair and competitive. Information and education are always prime when purchasing any item. We encourage you as the homeowner to ask questions and seek out information from other trusted sources. We want you to have confidence in our company as a reputable business that will serve your best interests.