Herrmidifier Dual Pneumatic - Manual (Page 8)

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
XI. EXTENDED SHUTDOWN
After an extended shutdown, air and water lines should be
blown out prior to resuming normal operation
XII. ATOMIZING HEAD ADJUSTMENT
The atomizing heads are factory adjusted and tested.
Typically, no adjustment is required unless the atomizing
heads have been disassembled for maintenance. Do not
adjust individual atomizing heads to reduce capacity or
enhance performance. This is done only by changing the
operating pressures for the entire system.
1. Turn the system on to full output and check that the air
and water pressures are correct.
2. Remove the cap from the back of the atomizing head.
3. Using a screwdriver, slowly turn the spring tension nut
clockwise until the atomizing heads stops spraying.
4. Note the position of the spring tension nut.
5. Back the spring tension nut out two full turns
counterclockwise.
6. If head is not spraying at start of procedure, back out
spring tension nut until head starts to spray and then
begin step 3.
XIII. NOZZLE TROUBLESHOOTING
1. Heavy spray patters (droplets too large)
a. All heads – This is caused by incorrect air and
water pressure settings. Review settings and
adjust as required. Never allow air pressure to
exceed the water pressure.
b. Individual heads – These heads are not getting
enough air for one of the following reasons:
i. Foreign matter may be clogging the screen
(AH-21) in the air strainer union of the head.
Clean or replace it.
ii. One or more of the heads may have been
improperly adjusted or the individual shut-off
valve may be throttled. No valves should ever
be throttled. Readjust if necessary.
iii. Water nozzle (AH-942) orifice may have been
enlarged due to bent cleaning needle. Replace
parts as required.
iv. Atomizer nozzle (AH-941) orifice may have
been enlarged due to improper cleaning or
dirty air. Replace part as required. Standard
air orifice sizes for the various heads are as
follows.
WARNING
Absolutely no other components may be mounted inside
or electrically tapped into the humidifier without voiding
the warranty.
1. 6 lb/hr. - 0.95 mm
2. 8 lb/hr. - 1.10 mm
3. 10 lb/hr. - 1.15 mm
4. 12 lb/hr. – 1.35 mm
5. 15 lb/hr. – 1.45 mm
2. Spray pattern too light at full capacity
a. All heads – This is caused by incorrect air and
water pressure settings. Review settings and
adjust as required. Never allow air pressure to
exceed the water pressure.
b. Individual heads – These heads are not getting
enough water for one of the following reasons:
i. One or more of the heads may have been
improperly adjusted or the individual shut-off
valve may be throttled. No valves should ever
be throttled.
ii. Foreign matter may be restricting water flow
in the water nozzle (AH-942). Turn off the air
and water valves at the head.
Remove the atomizer nozzle and water nozzle. Blow
water nozzle with air. Do not use wire or other hard
object that will score the inside of the nozzle.
3. Sputtering heads (Air pressure at the atomizing heads
exceeds water pressure.)
a. Adjust air and water pressures to correct operating
pressures.
b. Normally open drain solenoid on water control
section may have a malfunction allowing water
to leak into drain line during operation. Solenoid
valve seat may have foreign matter under the seat
causing it to leak. Solenoid may have defective seat.
4. Inoperative heads (all heads)
a. The atomizing heads may be shut down because
the system controls and set points are satisfied.
b. If the desired RH level has not been achieved,
check calibration of the controls and adjust as
required.
c. Air and water supply valves are not open.
d. No supply air pressure. If supply valves are
open and the gauges indicate no air pressure,
check compressed air source.
e. No power to the air and water solenoid valves.
Check controls and control cabinet fuses.
5. Inoperative heads (individual heads)
a. Be sure air and water valves to the atomizing
heads are open.
b. Possible defective parts inside atomizing head.
Shut off air and water valves to the head and
remove head from the system. Disassemble
and examine internal parts. Repair and
reassemble as required. Rebuilding kits are
available from your local Herrmidifier
representative. Perform a complete restart and
readjustment of the atomizing head upon
reassembly and repair.
6. Air without water – Be sure water valve to control
section is open. Check modulating water valve, water
solenoid and drain solenoid on water control section.
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