Dual Pneumatic
I n s t a l l a t i o n , O p e r a t i o n & S e r v i c e M a n u a l
8
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IV. SYSTEM LAYOUT AND INSTALLATION
Be sure all parts are used in the system in their proper order
and direction of flow. DO NOT leave out any parts because
they have a different function in the operating system.
Layout of Head Assemblies
1. Be sure all fittings are in their proper place in all head
assemblies. (Reference drawings on the next page).
Do not add parts to these assemblies without permis-
sion from TRION. Head assemblies for systems using
demineralized water supplies will have the same com-
ponents as shown on this page. However, their materi-
als may be different, e.g. PVC or stainless steel.
2. The smallest spray pattern is experienced at low levels
of relative humidity and high temperatures, and the
largest pattern at the high levels of relative humidity and
low temperatures. If the head discharges directly into a
warm air stream that is moving in the same direction as
the head spray discharge, any size head can be used.
(This is found when heads are located at discharge
grilles of an air handling system.) The chart below is a
good guide to follow in selecting proper head capacity.
Spray Visible to This Point
from Hd in Med
Head
Cap.
Inst.
Hgt.
Use w/
RH Lvls
Max.
Spray
Dia.
Low
(<45%)
RH
Med
(45-60%)
RH
High
(>60%)
RH
6 lbs/hr
Any
Any
2.5 ft
10 ft
13 ft
16 ft
8 lbs/hr 12 ft+
Any
2.5 ft
10 ft
13 ft
16 ft
10 lbs/hr 14 ft+ Up to 85%
3 ft
11 ft
14 ft
17 ft
12 lbs/hr 16 ft+ Up to 75% 3.5 ft
12 ft
15 ft
18 ft
15 lbs/hr 18 ft+ Up to 65%
4 ft
13 ft
17 ft
21 ft
Note: The above table applies to installations at normal temperatures
(68°-75° F) and with no forced air movement in the area.
For temperatures 50°-67° F, use first smaller head size. For
temperatures 32°-49° F, use second smaller head size. For example:
18 ft installed height @ 70° - 65% RH: Select 15 lb/hr head
@ 55° - 65% RH: Select 12 lb/hr head
@ 36° - 65% RH: Select 10 lb/hr head
Important: Obstructions such as columns, stacks of materials, etc. may
indicate that even a lower capacity head might be preferred. Good
air movement in the space results in more rapid evaporation of the
atomized water into the vapor state with shorter spray patterns being
visible. However, very high air movement can carry droplets causing
them to impinge on objects - especially at high levels of RH.
3. The number of head assemblies required should be
calculated and then properly arranged to provide
uniform coverage.
4. Do not locate heads in a manner where the spray will
contact a wall, machine, unit heater, pipes, columns,
conveyer, lights, wires, or obstructions. Distance from
such obstructions should not be less than the maximum
visible spray pattern length. (See chart above.)
5. Heads should be located so that the discharge is away
from personnel to ensure that droplets and evaporative
cooling will not cause discomfort.
6. Do not locate heads in such a manner that they
discharge directly towards one another, unless they
are further apart than twice the maximum distance the
spray pattern is visible. (See chart above.)
7. In all cases, the heads can be further apart than the
maximum visible spray pattern. Due to Dalton’s Law
of Partial Pressures, the water vapor travels throughout
the area very rapidly, and a uniform level of relative
humidity will be attained and maintained automatically.
8. Pipe runs should be kept as short as possible.
9. Head assemblies must have less than 100 feet of pipe
run between the control section and the farthest head
assembly.
10. Head assemblies A-17 and A-33 should be a minimum
of 4 ft. apart on air and water pipes. Head assembly
B-13 should be mounted a minimum of 8 ft. apart.
11. It is recommended that the heads be located above
the air and water lines. However, if this is not practical
for installation or aesthetic reasons, the heads may be
hung below the air and water lines. In this case, the 3/4”
air lines should be run on the bottom and the 1/2” water
line run on top. Air and water takeoffs must always
come of the top of the lines regardless of the position of
the heads. The heads may NEVER be positioned more
than 18” vertically from the air and water lines.
12. Heads installed near a wall with the spray directed away
from the wall should be kept at least one foot away (from
the wall) to allow for start-up adjustment on the heads.
13. Use ONLY copper or plastic air and water lines. DO NOT
USE IRON, STEEL, OR GALVANIZED PIPE, as these
types are especially susceptible to scaling and flaking,
which can cause jamming of the head mechanism. If
iron, steel, or galvanized piping must be used before
the system, a filter MUST be installed at the transition.
14. Air and water lines MUST be located so that a straight
level run can be maintained from the control section
to the heads. Avoid excessive curves and NEVER
allow loops in the piping, as these will trap air and
debris. ALL HEADS MUST BE LEVEL AND AT THE
SAME ELEVATION. If loops are unavoidable in routing
piping, air vents must be installed at the high point of
the vertical drop.
15. Hose bibs, supplied by others, must be used on the
ends of ALL water and air lines for each in maintaining
the system.
