GAYLORD C-6000 Series, Техническое руководство

Страница: 22 / 54

22
MEASURING INLET SLOT VELOCITY
FIG. 12A
FIG. 12B
FIG. 12C
CROSS SECTION OF TYPICAL
VENTILATOR INLET SLOTS
The standard instrument used for measuring the inlet velocities
on a Gaylord Ventilator is a Pacer, Model DA40 or DA4000
Digital Anemometer. This instrument is the easiest, most
accurate and the best suited for measuring ventilator inlet slot
velocities. To take accurate air velocity readings, follow the
instructions at right.
Instructions
1. It is first necessary to determine if the ventilator includes
Custom Air baffles as shown in fig. 12B. If shop drawings are
available, and if equipped, the custom baffles and their location
will be noted on the front elevation. If not available, to determine
if Custom Air baffles are provided, open the inspection door
and look for the top custom air baffle, as shown in Fig. 12B.
2. If the ventilator includes Custom Air baffles, it will be
necessary to take two sets of readings - one for the section of
ventilator that includes Custom Air baffles and one where it
does not.
3. Attached the sensing head guide bracket, Gaylord Part
Number 18408, to the sensing head.
4. Attach the cable from the sensing head to the meter and the
handle sections to the sensing head.
5. Place the sensing head guide bracket against the lower lip
of the inlet slot as illustrated.
6. Using the 16 second averaging feature on the meter, slide
the sensing head along the slot, back and forth, for a 3'-0" to
4'-0" distance, and record the velocity at the end of the 16
second mark. Continue this process for the full length of the
ventilator.
Imortant Note: If the ventilator includes custom air baffles as
illustrated in Fig. 12B, always take separate readings on the
section of the ventilator that includes custom air from the
section that does not have the baffles. Non custom air and
custom air readings must be recorded seperately. Do not
average them together.
Important Note: On the rear slot of a Model BDL-DS Series,
do not use the guide bracket. Refer to Figure 12C.
7. Record the velocity (fpm) on the start up inspection report
form. A sample report form, which can be photocopied, is
provided on page 52.
8. The designed, or optimum velocity, is noted on the shop
drawings and the Air Velocity Chart on page 21. Two velocities
will be noted if the ventilator includes custom air baffles.
9. Compare the recorded air velocity to the designed air
velocity shown on the shop drawings or the Air Velocity Chart
on page 21. The recorded velocity may be slightly lower or
higher providing that it is within the minimum and maxi-
mum range as shown on the Air Velocity Chart .
If the air velocity is outside the minimum/
maximum range, the performance
of the ventilator will be affected and
therefore the exhaust fan must be
adjusted.