507838-01
Issue 1813
Page 7 of 19
11. Knock out drain seal plate from access door. Secure
plate to cabinet front flange with screw provided.
12. Flip access door and replace it on the unit.
13.
Set unit so that it is sloped 1/4ʺ toward the drain pan
end of the unit. Connect return and supply air plenums
as required using sheet metal screws.
14. If suspending the unit, it must be supported along the
entire length of the cabinet. If using chain or strap,
use a piece of angle iron or sheet metal attached to
the unit (either above or below) so that the full length
of the cabinet is supported. Use securing screws no
longer than 1/2ʺ to avoid damage to coil or filter, as
illustrated in Figure 3. Connect return and supply air
plenums as required using sheet metal screws.
Downflow Application
NOTE: If downflow application is required, separately
order kit number 83M57 and install per kit’s instructions.
Also use metal or class I supply and return air plenums.
Use the installation instruction provided with the downflow
kit.
If electric heat section with circuit breakers (AEHK) is
installed in a BCE7E unit in a downflow application, the
circuit breakers must be rotated 180° to the UP position.
See AEHK installation instructions for more details.
IMPORTANT
Brazing Connections
To prevent the build-up of high levels of nitrogen when
purging, it must be done in a well-ventilated area.
Purge low-pressure nitrogen (1 to 2 psig) through
the refrigerant piping during brazing. This will help to
prevent oxidation and the introduction of moisture into
the system.
IMPORTANT
All coils are equipped with a factory-installed, internally
mounted check/expansion valve.
Model
Liquid
Line
Vapor
Line
Line Sets
-018
-024
-030
-036
3/8ʺ
(10mm)
3/4ʺ
(19mm)
L15 line set sizes are
dependant on unit match-
up.
-042
-048
7/8”
(22mm)
-060
Field fabricated
Table 2. Refrigerant Line Sizes
Danger of explosion!
Can cause equipment damage, injury, or
death.
When using a high pressure gas such as
dry nitrogen to pressurize a refrigeration or
air conditioning system, use a regulator that
can control the pressure down to 1 or 2 psig
(6.9 to 13.8 kPa).
IMPORTANT
AIR HANDLER UNIT
SUCTION LINE
LIQUID LINE
Figure 6. Brazing Connections
NOTE: BCE7E series air handlers use nitrogen or dry
air as a holding charge. If there is no pressure when the
rubber plugs are removed, check the coil for leaks before
installing. After installation, pull a vacuum on the line set
and coil before releasing the unit charge into the system.
NOTE: See outdoor unit instructions on how to flow
nitrogen through line sets.
1. Remove access panel.
2. Remove the refrigerant line caps from the refrigerant
lines.
3. Use a wet rag to protect TXV sensing bulb (or remove
it) when brazing suction line connections.
