14
18-CD30D1-20-EN
Installer’s Guide
TABLE 8
MINIMUM CLEARANCE FROM COMBUSTIBLE MATERIALS FOR
UPFLOW/HORIZONTAL AND DOWNFLOW/ HORIZONTAL FURNACES
UNIT LOCATION
FURNACE
SURFACE
VERTICAL
CLOSET
HORIZONTAL
CLOSET
HORIZONTAL
ALCOVE / ATTIC
SIDES
0"
1"
0"
BACK
0"
3"
6"
TOP
1"
1"
1"
FRONT
3"
3"
18"
VENT
0"
0"
0"
NOTE
: CLEARANCE REQUIRED AT TOP OF PLENUM IS 1"
furnace cabinet. Typical installations are shown in Figure
22. Tables 6 and 7 provide information for installation
of the filter retaining brackets shipped with downflow
furnaces.
TABLE 6
Airflow
DOWNFLOW/
HORIZONTAL
DOWNFLOW
Airflow
Important: When using the supplied high velocity
filters, the filter support base must be installed into
the furnace duct flange prior to ductwork installation.
Remove the brackets from the blower compartment. They
are wrapped in foam and taped to the side of the downflow
unit.
Remove the four screws securing the top panel. Save
screws.
Slide the top panel forward approximately 1”.
With support tabs facing up, install the filter base by inserting
one end tab into the duct flange at the rear of the furnace.
Slide the top panel back to its original position, engaging the
other end tab in the slot. Replace screws.
MODELS
NUMBERS
CABINET
WIDTH
FILTER
QTY & SIZE
*DHMB060BCV3VB
*DHMB080ACV3VB
17-1/2"
2 - 14" X 20" X 1"
*DHMC100ACV4VB
21"
2 - 16" X 20" X 1"
*DHMD120BCV5VB
24-1/2"
2 - 16" X 20" X 1"
*First letter may be "A" or "T"
TABLE 7
LOCATING FILTER RETAINER BRACKETS IN DUCTWORK
CABINET
WIDTH
RETURN
DUCT
WIDTH
DIMENSION
"A"
DIMENSION
"B"
FILTER
BRACKET
LOCATION*
17-1/2"
16-1/4"
15"
14"
14-3/8"
21"
19-3/4"
19-1/2"
14"
13-1/8"
24-1/2"
23-1/4"
22"
14"
13-5/8"
* LOCATION DIMENSION IS FROM END OF DUCT AGAINST THE FURNACE TO THE
SCREW HOLES FOR THE BRACKET.
Remove
brackets
Screw
locations
Flanges
upward
s