Other Merit Reviews
A thread on gardenweb.com weighs the pros of installing a Lennox Merit ML180 furnace versus one of several proposed American Standard models. At least one expert writes in favor of the ML180, but adds that the homeowner opt for the most efficient single-stage unit available to provide even heating throughout this large home. Other experts protest that the Lennox quote comes from a contractor working with a large discount store.
A new homeowner asks for a comparison between the Lennox Merit series and two Carrier equipment bids on hvac-talk.com. The contractor responds that the products are similar enough that the consumer should make a decision based on who is the better installer. The homeowner feels the Lennox installer has been the more knowledgeable. The expert recommends that the consumer negotiate for a 10-year labor warranty on the Merit series, citing the short warranty as the biggest drawback.
Another post on gardenweb.com reveals a homeowner replacing his 40-year-old Lennox furnace. The consumer has received quotes for three different option in Lennox’s Merit series. The experts feel that Lennox offers a good product, and encourage the customer to select a higher-end option, such as a 90-percent efficient variable-speed furnace, as they suggest he’ll see a return on his investment as he plans to stay in the home at least another 10 years.
Question and Answer
Question:
What causes an alternate blinking upon start up?
Answer:
If the lights are an alternating slow flash then it could be “burners failed to ignite or lost flame 5 times during single heating demand”. If the lights are an alternating fast flash then it could be an “improper main ground”. OR: Line voltage below 90 volts. To see more on the diagnostic codes see page 44 in the manual.
Lennox Merit Model Numbers
The Merit is available in different models which vary in efficiency and capacity.
Model Number |
AFUE |
BTUs per Hour |
ML193DF045P36B-* |
93 |
44,000 |
ML193DF070P36B-* |
93 |
66,000 |
ML193DF090P48C-* |
93 |
88,000 |
ML193DF110P60C-* |
93 |
110,000 |
ML193UH045P36B-* |
93 |
44,000 |
ML193UH070P24B-* |
93 |
66,000 |
ML193UH070P36B-* |
93 |
66,000 |
ML193UH090P36C-* |
93 |
88,000 |
ML193UH090P48C-* |
93 |
88,000 |
ML193UH110P48C-* |
93 |
110,000 |
ML193UH110P60C-* |
93 |
110,000 |
ML193UH135P60D-* |
93 |
132,000 |
Merit Warranty
Lennox offers a 20-year limited warranty on the heat exchanger in its Merit series products, as well as five-year limited parts and compressor warranties. In addition, the company offers an extended warranty for the ML195 furnace which bumps its 20-year heat exchanger warranty to a limited lifetime offer, and the five-year parts coverage up to a 10-year limited parts guarantee. The extension is available to units ML195DF and ML195UH that are registered online within 60 days of installation.