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
12
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Each Dual Pneumatic Atomizing System is custom designed
for each application to maintain the level of relative humidity
desired under the conditions to be maintained with the
equipment as it exists in the area at the time. If ANY
conditions change, the demand load for humidification can
be affected.
Once the system is installed, checked out, and started in
accordance with the instructions contained in this manual,
operation is completely automatic to maintain the level
of relative humidity. With air and water supplied to the
equipment, the system cycles ON and OFF as needed.
Set the desired level of RH on the control humidistat, 10%
more on the safety humidistat, and you can walk away and
forget it.
If there is a POWER FAILURE, the system automatically
shuts off.
If there is an AIR COMPRESSOR FAILURE, the system
automatically shuts off.
If there is a FAILURE OF THE WATER SUPPLY, the heads
will blow air.
If the water supply PRESSURE is lost or reduced, the heads
will “sputter”.
If the CONTROL humidistat fails to shut off the system, the
SAFETY humidistat will shut off the water to the heads at 10%
above the desired level of RH. You cannot over-humidify to
any greater extent than the 10%.
The atomizing heads operate drip free and are self-cleaning
and self-purging at the end of every ON cycle. The system
is designed to go ON and OFF. Without this cycling, the
cleaning and purging action is lost.
The system can be started and stopped by merely operating
the control humidistat.
All humidification equipment needs periodic maintenance.
The procedure for the Dual Pneumatic System is spelled out
in that section of this manual. Otherwise, the operation is
fool-proof and dependable.
VII. MAINTENANCE INSTRUCTIONS
The Dual Pneumatic Atomizing System requires little
maintenance to keep it operating properly. In hard water
areas and dusty atmospheres, more frequent attention will
be required.
NORMAL MAINTENANCE required is as follows.
• AIR COMPRESSOR:
Follow the air compressor
manufacturer’s instructions.
• ATOMIZING HEADS:
Clean dust and debris from the
OUTSIDE of the heads as required to keep the spray
pattern adequate. At least ONCE A YEAR, remove the
atomizer nozzles (AH-941-X-X). Clean these nozzles in
a weak acid solution. Do NOT use a wire or other object
that will score the nozzle or its orifice.
• AIR & WATER LINES:
Blow out all supply lines at least
ONCE A YEAR using the procedures covered under
start-up of the system in this manual. Check all joists
and valves for leaks ONCE A YEAR.
• STRAINERS:
Strainers on air and water controls (both
primary regulators and control section regulators) should
be cleaned ONCE A YEAR and replaced as required.
Strainer screens (AH-21) in the strainer union assembly
(AH-17) of each head should be cleaned ONCE A YEAR.
If air strainers are dirty or oily, it may be necessary to
install an air dryer or after cooler on the compressor or a
separator on the air line.
• HUMIDISTATS:
Calibration should be checked with a
dependable psychrometer at least ONCE A YEAR and
adjusted as needed.
• HYGROMETERS:
(RH indicators) Use psychrometer to
check for accuracy.
• PRESSURE REGULATORS:
Air and water (primary
and control sections) - check operation at least ONCE A
YEAR to be sure regulation to desired pressures is being
maintained properly.
• SOLENOID VALVES:
Air and water (control sections) -
check operation at least ONCE A YEAR to be sure their
operation is proper and valves do not leak.
After the removal and re-installation of heads and control
sections, ALWAYS follow the start-up procedure to be sure
all foreign matter is flushed from the lines and none reaches
the heads.
Your system will last indefinitely if properly maintained.
VIII. TROUBLESHOOTING
HEAVY SPRAY PATTERN (Droplets too large)
ALL HEADS served by one control section: either this is
caused by too low a setting on the air pressure regulator of
the air control section, which calls for slightly increasing the
air pressure - or too high a setting on the water regulator
of the water control section, which requires decreasing the
water setting slightly.
NEVER LET AIR PRESSURE EXCEED WATER PRESSURE.
INDIVIDUAL HEADS: These heads are not getting enough air.
1. Foreign matter may be clogging the screen (AH-21) in
the air strainer union (AH-17) of the head.
2. One or more heads served by the same control section
may have been IMPROPERLY ADJUSTED by throttling
the valves at the head assembly. No valves should ever
be throttled!
3. Water nozzle (AH-942-X) orifice may have been enlarged
due to bent cleaning needle on diaphragm (AH-10).
