Clemco ZERO BNP 220 series Manual Download Page 14

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BNP 65 and 220 SUCTION BLAST CABINETS

Page 13

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Manual No. 21309, Rev. I 06/16

5.6

Cabinet Air-Inlet Damper

5.6.1

Once the inlet is initially set per Section 2.6, it

seldom requires readjustment. The initial setting
produces approximately .5



to .75



of static pressure in

the cabinet enclosure.

Do not confuse cabinet static

pressure with reclaimer static pressure, which is
controlled by the dust collector damper as noted in
Section 5.4. Reclaimer pressure must be set before
cabinet pressure.

5.6.2

Using a manometer (as noted in Section 5.8 and

listed in Section 9.1) is the most accurate method of
monitoring and adjusting cabinet pressure. Following the
instructions packed with the manometer, start the
exhauster and insert the needle into a glove, and adjust
pressure using the cabinet’s air-inlet damper. Open the
damper farther to decrease static pressure or close it
farther to increase pressure.

5.6.3

If a manometer is not available, use the gloves

as an indicator. With the exhauster ON, the gloves
should be inflated, but not elevated off the grate.

5.7

Door Interlocks, Figure 17

WARNING

Never bypass the door interlock system. Doing
so could result in injury from unexpected
blasting.

5.7.1

The door interlocks disable the blasting control

circuit when doors are open. To enable blasting, the
door interlock switches must be engaged when doors
are closed. The interlocks are set at the factory and do
not normally require field adjustment unless parts are
replaced. When adjustment is required, proceed as
follows.

5.7.2

Close cabinet doors.

5.7.3

Loosen the actuator bracket screws and

adjusting screw nut. Move the actuator bracket up or
down, and the adjusting screw sideways, as needed to
center the adjusting screw on the over-travel stop (in
center of detent sleeve). Tighten the bracket screws.

5.7.4

Turn the adjusting screw in or out as required to

engage the switch without applying excessive pressure
on it. Tighten the adjusting screw nuts.

5.7.5

Test the operation with the doors open and then

again closed. Point the nozzle away from the door
during the tests, and open the door only enough to

disengage the interlock switch. The interlocks should
stop the blasting when the doors are opened, and permit
blasting when the doors are closed. NOTE: Negative
pressure inside the cabinet may cause the doors to flex
inward. Tests should be performed with the exhauster
running.

Figure 17

5.8 Optional

Manometer

NOTE: These instructions show several methods of taking
static pressure readings (negative pressure) on cabinet
reclaimers using a flexible tube manometer. Use the
method best suited for the application. The instruction
explains the processes for taking periodic readings and
shows how to permanently install the manometer for
taking frequent readings. Permanent fittings should be
installed when rigid ducting is used, or when the
manometer installation is permanent. Use silicone sealer
or other sealant to seal around the permanent fitting to
prevent leaks. The fitting should be capable of being
capped when the manometer tube is removed. Capping
the fitting will prevent leaks that alter the reclaimer’s
separation efficiency. The readings are reference points
so it doesn’t matter where the readings are taken as long
as they are always taken at the same location. Taking
readings at different locations could produce different
results. Static pressure readings at the door are generally
.5" to 1" lower than those taken above the reclaimer.