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If this is a case coil, they do not have a filter area, the filter is normally either installed in the return air grill or needs some type of filter installed just upstream if in a down air installation in a closet. If it attached to a furnace, there is a space provided by most manufactures for a filter installed just before the air return. If the furnace is in the attic or in a crawlspace, I never install a filter in these areas, but put a return filter grill in the return path.
Hope this helps
I would probably use a furnace for the correct application. However some motors do have a reverse speed connection. Besides the blower speed taps,
capacitor wires and the nuetral wire. There are two wire sets that you can switch that can do this if your blower motor is equipped.
You might experience some airflow problems, probably a lack of airflow, if the furnace was installed
as an upflow model instead of a counterflow.
You will need to post the serial number. The model number does tell me that you have a painted case, three ton coil with a fixed metering device installed, and it fits a 21" furnace or air handler. The first four numbers of the serial number will give the manufacturing date.
I dont think you can change a gas furnace from horz/upflow to downdraft,the inducer motor would never prove the pressure switch, the drainpan would upside down,you can order a downdraft unit, i dont believe this unit is made for that
Your furnace is more than 90% efficient and extracting so much heat from the gas that it condenses instead of blowing out steam. This is good! Figure that for every dollar you spend on fuel, you are getting back 90+ cents back in heat. Compare that to the typical units that only get 70 - 80 cents back in heat. Yes you should drain your condensate to a proper drain via gravity or a condensation pump. I would recommend you treat the condensate first with a acid neutralizer prior to draining in municipal drains due to it's high content of sulfuric acid. You can purchase these filter type neutralizers on the net or at a good heating wholesaler.
look in and around where the blower motor is located. there has to be a filter compartment there. probably near the bottom as it looks like an upflow heater. make sure the filter door is closed. it may have a door interlock switch that cuts the burner out if it is not fully closed.