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To perform a pressure test of the Heat exchanger. In 1997 Lennox had a recall of all Pulse furnaces made from day one (1981 I believe) up till January 1st 1990. The recall was due to an increasing failure rate of the stainless steel welds on the secondary heat exchanger. The rcall included a free pressure test of the HX, and free replacment of the HX including labor if it failed the pressure test standards set by Lennox. The recall lasted about 2 years. Since then Lennmox has mandated that ALL Pulse furnaces, including those that had the Heat Exchangers replaced, be pressure tested and have the air flappers replaced every four years. I have seen Pulses made after 1990, as well as Pulses with replacement heat exchangers fail the pressure tests during the last couple of winters.
Lennox is no longer making the Pulse furnace or replacement heat exchanger kits. To honor their warranty, they will provide a single stage 90% equivalent furnace as a replacement, with the option to upgrade to a two stage or two stage with variable speed blower for an additional cost. The consumer is responsible for the labor to install the new furnace and any other materials needed to properly install the provided furnace.