kghays
Dec 19, 2010, 07:03 PM
I've replaced my furnace with a the echelon 8v during A/C season. The existing chronotherm T8600C1014 is about 20 yrs old. All was well during cooling season.
In heating the blower off delay is not responding as programmed on the board. It is set for 90 sec. When stat drops the call for heat the blower immediately starts its 15 sec slowdown to off. I recognized this problem early in the heat season when cycle time had 15+ minutes of off time. Once it got colder and off time dropped to less than 8 min I began to realized that a call for heat brought the blower on immediately; no 30 delay for the chamber to warm up. Gas valve would oopen about 1 min later. It turns out that when that happens it is because of an open limit (4 red flashes). After about 1 min of cool down it goes to slow amber flash and opens the gas valve for a normal cycle. - Except that it will not get a blower delay as programmed at the end of the cycle which will cause the whole problem to start over again. I have taken the chronotherm down and jumped R & W to confirm a normal cycle startup and correct blower off delay. Any suggestions of how the chronotherm may be confusing the timing circuit? Have never seen 24V phasing/ twinning error codes on the furnace.
In heating the blower off delay is not responding as programmed on the board. It is set for 90 sec. When stat drops the call for heat the blower immediately starts its 15 sec slowdown to off. I recognized this problem early in the heat season when cycle time had 15+ minutes of off time. Once it got colder and off time dropped to less than 8 min I began to realized that a call for heat brought the blower on immediately; no 30 delay for the chamber to warm up. Gas valve would oopen about 1 min later. It turns out that when that happens it is because of an open limit (4 red flashes). After about 1 min of cool down it goes to slow amber flash and opens the gas valve for a normal cycle. - Except that it will not get a blower delay as programmed at the end of the cycle which will cause the whole problem to start over again. I have taken the chronotherm down and jumped R & W to confirm a normal cycle startup and correct blower off delay. Any suggestions of how the chronotherm may be confusing the timing circuit? Have never seen 24V phasing/ twinning error codes on the furnace.