Armstrong Air BCE7E-036 Manual de instruções de instalação - Página 7

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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.

IMPORTANT

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.

Brazing Connections

IMPORTANT

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.

All coils are equipped with a factory-installed, internally

mounted check/expansion valve.

507838-01

Liquid

Model

Line

-018

-024

-030

3/8ʺ

-036

(10mm)

-042

-048

-060

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).

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.

Remove access panel.

Remove the refrigerant line caps from the refrigerant

lines.

Use a wet rag to protect TXV sensing bulb (or remove

it) when brazing suction line connections.

Issue 1813

Vapor

Line Sets

Line

3/4ʺ

L15 line set sizes are

(19mm)

dependant on unit match-

up.

7/8"

(22mm)

Field fabricated

IMPORTANT

AIR HANDLER UNIT

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