18-CD34D1-5-EN 11
INSTALLER’S GUIDE
▲
WARNING
!
Do NOT install the filter in the return duct directly
above the furnace in horizontal applications. Install
the filter remotely. Installing the filter directly
above the furnace in horizontal applications may
cause property damage, serious injury or death.
▲
WARNING
!
TO PREVENT INJURY OR DEATH DUE TO CONTACT
WITH MOVING PARTS, TURN THE POWER TO THE
FURNACE OFF BEFORE SERVICING FILTERS.
When the upflow furnace is installed in the horizontal right
or left application and a close coupled (less than 36") return
duct is attached to the bottom side of the furnace as shown
in Figure 12, securely attach a 1/2" mesh metal hardware
cloth protective screen to the inside bottom of the filter grill
to prevent personal injury from contacting moving parts
when reaching into the return opening to replace the
filter.
FILTER
REMOVE FILTER FROM UPFLOW
FURNACE WHEN RETURN DUCT IS
ATTACHED TO FURNACE TOP SIDE
(HORIZONTAL LEFT OR RIGHT APPLI-
CATIONS) AS SHOWN.
Close coupled (less than 36")
return (filter directly beneath bottom
side return) not recommended due to
noise considerations. If used, securely
attach 1/2" mesh metal hardware cloth
protective screen to the inside bottom of
filter grill.
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Close coupled (less than 36") return (filter directly beneath
bottom side return) is not recommended due to noise
considerations.
7.
Connect the duct work to the furnace. See Outline
Drawing for supply and return duct size and location.
Flexible 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.
8. When replacing a furnace, old duct work should be
cleaned out. Thin cloths should be placed over the
registers and the furnace fan should be run for 10 minutes.
Don’t forget to remove the cloths before you start the
furnace.
RETURN AIR FILTER
These furnaces require high velocity type air filters which may
be located within the furnace blower compartment for UPFLOW
furnaces in either a BOTTOM or SIDE (left side or right side)
return air inlet. See Figures 13 and 14. Some filters may need to
be trimmed for side or bottom filter use.
NOTE: On upflow 5 ton airflow models, if the airflow
requirement exceeds 1800 CFM, these models will require
return air openings and filters on both sides; OR 1 side and
the bottom; OR just the bottom.
NOTE: Upflow models only - Installation of the alternate
bottom filter kit requires the bottom flange to be bent flat.
Optional downflow furnace filters must be located outside the
furnace cabinet. Typical installations are shown in Figures 14 and
15. Tables 5 and 6 provide information for installation of the filter
retaining brackets shipped with downflow furnaces.
TABLE 4
MODEL
CABINET WIDTH
REQUIRED FILTER
SIZE FOR BOTTOM
M801P040AU24AA
M801P060AU24AA
M801P060AU36AA
14-1/2"
1 - 14 X 25 X 1
M801P080BU36AA
M801P080BU48AA
M801P100BU36AA
17-1/2"
1 - 17 X 25 X 1
M801P100CU48AA
M801P100CU60AA
21"
1 - 20 X 25 X 1
M801P120DU60AA
M801P140DU60AA
24-1/2"
1 - 24 X 20 X 1
M801P060AD24AA
M801P060AD36AA
14-1/2"
BAYBRCKFLT10
2 - FLR01185
M801P080BD45AA
17-1/2"
BAYBRCKFLT10
2 - FLR01186
M801P100CD48AA
M801P100CD60AA
21"
BAYBRCKFLT10
2 - FLR01186
M801P120DD60AA
M801P140DD60AA
24-1/2"
BAYBRCKFLT10
2 - FLR01186
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Typical Filters of Upflow in Horizontal
Airflo
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BAYBRCKFLT10
