18-CD30D1-20-EN
11
Installer’s Guide
reinstall the two 5/16” screws.
8. 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 horizontal applications.
9. Connect duct work to furnace. See Outline Drawing
for supply and return duct size and location. Flexible
duct con nectors 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
Filters are factory supplied for these furnaces. These
furnaces require high velocity type air filters. The filters
may be installed within the furnace blower compartment
for UPFLOW furnaces in either a BOTTOM or SIDE (left
side or right side) return air inlet. Some filters may need
to be trimmed for side or bottom filter use.
TABLE 4
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) one side and the bottom, or
(3) just the bottom. The filter rack installation is
not allowed for right side return on the following
models: *UHMB060ACV3V, *UHMB080ACV3V &
*UHMC100ACV4V.
The furnace and the bottom filter rack, BAYRACK960,
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.
The Filter rails are spring loaded for automatic
adjustment to allow standard size, locally obtainable
replacement filters. The filter rack itself slides to adjust to
the required width needed for bottom or side return (See
Figure 12).
ALTERNATE FILTER RACK INSTALLATION FOR BOTTOM RE-
TURN - BAYRACK960
The following checklist should be used when installing as
a bottom return filter on an upflow furnace:
VIEW
PRE-DRILL
Two clearance holes with a
3/16” drill at dimple locations
(one per side)
Blower Deck
Engagement
Hole
⑬
FILTER RACK ASSEMBLY
⑫
BOTTOM FILTER RACK INSTALLATION
⑪
Airflow
MODELS
NUMBERS
CABINET
WIDTH
FILTER
QTY & SIZE
*UHMB060BCV3VB
*UHMB080ACV3VB
17-1/2"
1 - 17" X 25" X 1"
*UHMC100ACV4VB
21"
1 - 20" X 25" X 1"
*UHMD120BCV5VB
24-1/2"
1 - 24" X 25" X 1"
* First letter may be "A" or "T"