9.The horizontal installation of the upflow furnace requires an external filter section. Do NOT use the bottom return filter within the furnace. Filter kits are available for horizon- tal applications.
10.Connect duct work to furnace. See Outline Drawing for supply and return duct size and location. Flex- ible duct connectors are recommended to connect both supply and return air ducts to the furnace. If only the front of the furnace is accessible, it is recommended that both supply and return air plenums are removable.
RETURN AIR FILTERS
TYPICAL UPFLOW RETURN
AIR FILTER INSTALLATIONS
furnaces require high velocity type air filters. The filters may be installed within the furnace blower compartment for UPFLOW furnaces in either a BOT- TOM or SIDE (left side or right side) return air inlet. Some filters may need to be trimmed for side or bottom filter use.
0UPFLOW FURNACE ONLY
LOCATING | CUT | OUT | |
NOTCHES PRO- | |||
FOR | SIDE | ||
VIDED FOR SIDE | |||
FILTER | |||
RETURN CUTOUT | |||
|
| ||
FRONT
of Furnace
*SEE OUTLINE DRAWING
q
Installer’s Guide
TABLE 3
MODELS | CABINET | FILTER |
|
NUMBERS | WIDTH | QTY & SIZE |
|
*UX1B040A9H21B |
|
|
|
*UX1B060A9H31B | 1 - 17" X 25" X | 1" | |
*UX1B080A9H31B |
|
|
|
*UX1C100A9H41B | 21" | 1 - 20" X 25" X 1" | |
|
|
|
|
*UX1D120A9H51B | 1 - 24" X 25" X | 1" | |
|
|
|
|
*First letter may be "A" or "T"
**NOTE: For upflow 5 ton airflow models where the airflow requirement exceeds 1800 CFM - Modles will require return air openings and filters on: (1) both sides, or (2) one side and the bottom, or (3) just on the bottom
NOTE: For upflow 5 ton airflow models where the airflow requirement exceeds 1800 CFM - Models will require return air openings and filters on: (1) both sides, or (2)1 side and the bottom, or (3) just the bottom.
The furnace and the bottom filter rack installation can be seen in Figure 11.
The furnace filter in the bottom or side configuration can be removed by simply turning the two latches on the blower door and tilting the door forward.
OPTIONAL FILTER RACK INSTALLATION FOR BOT- TOM RETURN
The following checklist should be used when installing a bottom return filter on an upflow furnace:
a. Remove the filter.
b. Remove the filter rack.
c. Remove the bottom panel.
e. With the filter removed, the filter rack is com- pressed and then inserted into the bottom of the furnace. The retaining screw/pin on each side inserts into engagement holes at the bottom of the furnace cabinet side. See Figure 12.
f.Reinstall the furnace filter in the bottom posi- tion by inserting the chamfer end first into the filter rack
Airf low
BOTTOM FILTER RACK INSTALLATION
w
Furnace
Cabinet 
Side
Engagement Hole
For Filter Rack
Installation With
Bottom Return
Filter Rack
Retaining
Screw/Pin Filter
Rack
Bottom Panel
11 |