Lennox CBA25UH Series - Configuration Modification

Page 19
SIDE
VIEW
2” WIDE FOAM TA PE
DRIP SHIELD
1” WIDE FOAM TA PE (LONGER PIECE)
FIGURE 19. Applying Foam Tape to Drip Shield
COIL
DRIP SHIELD
DRIP PA N
FIGURE 20. Downow Drip Shields
6 - Replace the coil assembly and blower if you have
removed it. Replace the coil access panel.
7 - Set the unit so that it is level. Using sheet metal
screws, connect the return and supply air plenums
as required.
NOTE - For downow application, metal or Class I supply
and return air plenums must be used.
COMBUSTIBLE FLOOR
ADDITIVE BASE
PROPERLY SIZED
FLOOR OPENING
AIR
HANDER
UNIT
FIGURE 21. Downow Combustible Flooring Base
8 - For downow installation on combustible ooring,
an additive base must be used as illustrated in
gure 9. See CBA25UH Engineering Handbook for
downow combustible ooring base kits available
for this air handler.
9 - Cut an opening appropriately sized for combustible
base. Base dimensions are illustrated in gure 10.
After opening has been cut, set the additive base
into opening. Connect outlet air plenum to the
additive base. Set the unit on the additive base so
anges of the unit drop into the base opening and
seal against the insulation strips. The unit is now
locked in place. Install return air plenum and secure
with sheet metal screws.
TOP VIEW
OPENING
1‐5/8 (41)
SIDE VIEW
1‐5/8 (41)
11‐3/8
(289)
3 (76)
1‐5/8 (41)
22‐5/8 (575) -018/024
24‐5/8 (625) -030, 036
26‐5/8 (676) -042, 048, 060
5/8 (16)
13‐1/2 (343)
SUPPLY AIR OPENING
INCHES (MM)
23-1/4 (591)
20 (508)
FIGURE 22. Downow Combustible Base Dimensions
Brazing Connections
WARNING
Polyol ester (POE) oils used with HFC-410A refrigerant
absorb moisture very quickly. It is very important that the
refrigerant system be kept closed as much as possible.
DO NOT remove line set caps or service valve stub caps
until you are ready to make connections.
WARNING
Danger of re. Bleeding the refrigerant
charge from only the high side may result
in pressurization of the low side shell and
suction tubing. Application of a brazing torch
to a pressurized system may result in ignition
of the refrigerant and oil mixture. Check the
high and low pressures before applying heat.