Help! - The new replacement board is different than the original o...

HOMEOWNER CRIES FOR HELP...

posted: September 8th, 2008 - 2:04pm

QUESTION:
The new replacement board is different than the original one. The old one has the big old style relays while the new one has the newer relays. This new Board (ICM275) is the currently available replacement for many legacy Carrier boards including the HH84AA009 (which is the one I had). The board has the same form factor and all of the connection terminals are labeled exactly the same as in the old board. As mentioned before, I connected the wires from the old to the new one at a time to make sure I got them right.....There is a delay feature that can be adjusted by moving a potentiometer dial. Maybe somewhere out there knows if these newer boards (that use SPST-NO blower relay, SPDT blower speed relay and SPST-NO relay for humidifier) require any wiring changes from the old boards (that use SPST-NC or DPST-NC heating fan relay and DPDT cooling fan relay 2f) THe board is made by ICM controls and the schematics are on the icm site. update, it seems that when I set the blower settings at the stat to "on" instead of "auto" both the cooling and blower work. When I change the setting to auto, I get the problems again

ANSWER: If you have cooling with the fan in On mode I would set it that way til monday morning and call the local carrier office for tech support they may not help you as some of them will only support their dealers but it is worth a try.
It sounds to me like one of the relays is functioning differently in the new configuration there should have been an instruction sheet in the box describing any changes and what you would have to do about it.