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
13
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Replace parts as required.
4. Atomizer nozzle (AH-941-X-X) orifice may have been
enlarged due to improper cleaning or dirty air. (See
Maintenance section.) Replace parts as required.
SPRAY PATTERN TOO LIGHT
ALL HEADS served by one control section: either this is
caused by too high a setting on the air pressure regulator of
the air control section, which calls for slightly decreasing the
air pressure - or too low a setting on the water regulator of
the water control section, which requires increasing the water
setting slightly.
INDIVIDUAL HEADS: Heads are not getting enough water.
1. Water valve at head may have been throttled. No valves
should ever be throttled! Adjust head and shown in Step
7 of start-up procedure.
2. Foreign matter may be restricting water flow in the water
nozzle (AH-942-X). Shut off air and water valves at head
assembly. Remove atomizer nozzle (AH-941-X-X) and
water nozzle (AH-942-X) with wrench. DO NOT use wire
or hard object that will score inside.
SPUTTERING HEADS
ALL HEADS served by one control section: air pressure at
heads exceeds water pressure at heads.
• Adjust air and/or water pressure at control section so that
air pressure is about 2 psi lower than water pressure.
• Three-way solenoid on water control section may be
malfunctioning to allow water to leak down drain port
when system is operating. This may be caused by dirt
under the drain valve seat or a bad valve seat on the
drain side of the three-way solenoid. NOTE: The drain
side of the three-way solenoid should open only when
the system shuts off. Approximately one cup of water
should be drained from the system between cycles. A
greater amount may be a sign of air trapped in the water
line. Review start up procedure.
INDIVIDUAL HEADS:
1. Water valve supplying head assembly has been throttled.
No valves should ever be throttled.
2. Head improperly adjusted. Follow Step 7 of start-up
procedure.
3. Part malfunctioning inside head. Check diaphragm (AH-
10), spring (AH-8), and valve disk (AH-16). Correct as
required.
INOPERATIVE HEADS (No air or water)
ALL HEADS served by one control section:
1. These heads shut down because control humidistat is
satisfied.
2. If proper RH level has not been attained, check calibration
of the control humidistat and adjust if required. Use a
dependable psychrometer.
3. Air and water valves serving the control section are not
open.
4. Electric current not flowing to central section. Check
wiring and supply lines.
5. Compressed air is not reaching the control section.
Possible compressor failure.
INDIVIDUAL HEADS:
1. Be sure air and water valves at head assembly are
fully open.
2. Indicates diaphragm (AH-10) may be ruptured or
leaking OR water and air ports clogged. Close air and
water valves at head assembly. Remove rear part of
head (Bonnet, 253209-00X) with a wrench. Examine
the diaphragm (AH-10), spring (AH-7), and valve disc
(AH-16). Replace any bad parts. If these parts are
OK, reassemble the head. CAUTION: Use care in
reassembling so that cleaning needle is not damaged.
Remove atomizer nozzle (AH-941-X-X) and water nozzle
(AH-942-X). Clean these nozzle ports with air pressure
or as recommended under maintenance. DO NOT use
a wire or any object that will score the inside or port of
the nozzles. Reassemble the head, open the air valve
of the head assembly, then the water valve of the head
assembly and adjust spray pattern. (See Step 7 of the
start-up procedure.)
AIR WITHOUT WATER
ALL HEADS served by one control section: be sure water
valve at control section is open. RH exceeds that set on the
SAFETY humidistat. This shuts off water to all heads but
allows air to flow. Correct this condition by:
1. Set SAFETY humidistat higher than CONTROL
humidistat.
2. Make sure CONTROL humidistat is functioning to start
and stop system.
3. Check calibration of BOTH humidistats with a dependable
psychrometer.
4. Check the setting on the air pressure switch and be sure
that the switch is cutting in at 26 psi and out at 20 psi of
air pressure. Adjust accordingly by setting high end first
at 26 psi and then turning low end up against it.
INDIVIDUAL HEADS:
1. Water cut-off at valve at head assembly.
2. Water nozzle (AH-942-X) plugged with foreign matter.
Correct as above under “Spray Pattern Too Light”.
HUMIDITY LEVEL TOO LOW
1. Be sure CONTROL humidistat is set at desired RH.
2. Check calibration of CONTROL humidistat and
HUMIDITY INDICATOR with dependable psychrometer
and adjust as required.
3. Be sure humidistat is not being “influenced” by the spray
pattern of a head coming too close to it. Correct as
required.
4. Be sure humidistat is not being “influenced” by a cold air
stream blowing directly on it. Correct as required.
5. The temperature of the air in the area being humidified
may be different for than that for which the system was
designed. If so, AND this changed temperature will now
