Loud 2-Stage Furnace Start Up

[pocovin]

I just replaced my 30 year old Rheem single stage furnace with a high-efficiency York TM9T 2-stage furnace. I noticed that when the new furnace fires up, the ignitors/burners are rather loud during the first 30 seconds, then become much quieter for the next 30 seconds before the blower kicks in. Is the furnace initially starting in its second stage or first stage?

[pwg11386]

there are some furnaces that start in second stage and then drop down to first. if you have the installers guide for the furnace, there should be a section toward the back that tells the sequence of operation. you should find your answer there.
i think the reason for this is to heat the heat exchanger to a certain level

[commerce48]

pwg11386 is right! Many, but not all, multiple stage furnaces will start above low stage for up to two minutes to bring the heat exchanger up to operating temperature. There are several reasons for this including more time in higher efficiency. The blower turn on is delayed so that you don't get a blast of cold air before the heat exchanger has warmed up.

[pocovin]

...The blower turn on is delayed so that you don't get a blast of cold air before the heat exchanger has warmed up.

When the new high-efficiency furnace fires up, it blows cold air for the first 2-3 minutes. It appears that the blower is not delayed and the heat exchanger has not warmed up. Is there any way to reset this?

[pwg11386]

Do you mean that as soon as you turn on the unit at the thermostat, air begins to come out of the vents?

[pocovin]

Do you mean that as soon as you turn on the unit at the thermostat, air begins to come out of the vents?

Cold air begins to blow out of the vents within 1 minute after the furnace turns on. According to the operating manual "...the ignition control provides a 17 second ignitor warm-up period...the blower motor will energize 30 seconds after the gas valve opens...the fan on delay is fixed at 30 seconds". 17 seconds is definitely not enough time for the heat exchanger to warm up, as evidenced by the initial cold air. And it appears that the fan on delay cannot be adjusted since it's fixed at 30 seconds. Are there any other solutions?