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READ & SAVE THESE INSTRUCTIONS
Dual Pneumatic
Control Cabinet
Herrmidifier® | www.herrmidifier-hvac.com
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Installation, Operation & Service Manual
TABLE OF CONTENTS
Warranty ...............................................................................................................................................2
I. Introduction ........................................................................................................................................ 3
II. Operational Characteristics ..............................................................................................................3
III. Mounting .......................................................................................................................................... 3
IV. Plumbing .......................................................................................................................................... 4
V. Controls ............................................................................................................................................4
VI. Start-up Checklist ............................................................................................................................ 5
VII. Start-up ..........................................................................................................................................5
VIII. Atomizing Head Operation ............................................................................................................5
IX. Pressure Settings ............................................................................................................................ 5
X. Maintenance ..................................................................................................................................... 5
XI. Extended Shutdown ........................................................................................................................6
XII. Atomizing Head Adjustment ........................................................................................................... 6
XIII. Nozzle Troubleshooting ................................................................................................................. 6
XIV. Wiring Diagram ..............................................................................................................................7
Dual-Pneumatic
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Installation, Operation & Service Manual
WARRANTY
1. TRION, Inc. warrants to the buyer or any user during the duration of the Warranty that the Herrmidier humidier described in
this manual will be free from defects of material and workmanship for a period of two (2) years.
2. For this Warranty to be effective, this humidier must be installed, operated and maintained in accordance with the Installation
Instructions, Operations and Service Manual(s) supplied with the humidier.
3. In the event of a defect or malfunction in this product during the Warranty Period, user may contact their Herrmidier
Representative or Trion Customer Service Department for a Return Material Authorization number. Items tagged with this
number may be returned to the Trion Factory Repair Department for complete reconditioning without charge to the user
for parts or labor. Incidental expenses such as cost of transporting the part/unit to Trion shall be borne by the user. Upon
completion of the reconditioning, the humidier will be returned at no cost to the user. In an effort to keep equipment on line,
Trion may elect to send items out and use the RMA to return alleged defective parts for examination. Credit consideration will
be given upon return and conrmation of improper performance. In either case, items returned without an RMA number will
not be accepted!
4. This Warranty does not cover eld labor for repairs to this humidier or any special, indirect or consequential damages. Some
states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation may not apply
to you.
5. If, after a reasonable number of attempts to do so, TRION, Inc. is unable to remedy any defects or malfunctions in this
humidier, then the user may elect either a replacement of such product or part which may be defective without charge or a
refund at the buyer’s original purchase price.
6. This Warranty gives you specic legal rights, and you may also have other rights, which vary from state to state.
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Dual-Pneumatic
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Installation, Operation & Service Manual
I. INTRODUCTION
The Dual Pneumatic system is a space applied air/water
atomization system designed to introduce atomized water
into a factory setting via ON/OFF control.
II. OPERATIONAL CHARACTERISTICS
Upon a call-for-humidity, the controls will energize the
compressed air solenoid valve. An air pressure switch will
close if sufcient air pressure is present to allow for proper
atomization. When the air pressure switch contacts close,
the supply water valve opens, the water drain valve closes,
and atomization will begin. Each nozzle is equipped with
a clean-out pin that helps keep the water orice clear of
mineral build-up each time the nozzle is cycled. Periodically,
the controls will de-energize the water control section in
order to actuate the clean-out pin to keep the water orice
clear. During operation, if the air proving switch contacts
open, the system will de-energize. If the system ON/OFF
switch is opened the system will de-energize.
Allowable Operating Conditions
• Ambient Temperature: 40°-120°F (4°-50°C)
• Ambient Relative Humidity: 0% - 90%
• Line Voltage: -15% to +10% Nominal
• Frequency: 50/60 Hz
• Supply Air Pressure: 60-100 psig
• Supply Air Quality: Filter clean and dry to 35°F dew point.
• Supply Water Temperature: 40°-100°F (4°-38°C)
• Supply Water Pressure: 50-100 psig
• Supply Water TDS less than 50 ppm: Consult Factory
with water analysis and application data prior to selecting
equipment.
NOTE: If units are mounted in outdoor enclosures, conditions
inside enclosure must be maintained as shown above.
III. MOUNTING
The Dual Pneumatic system consists of two basic
components: the control cabinet and the atomizing-head
assemblies. The control cabinet should be mounted so that
the water outlet of the control cabinet is level or below the
water manifold. Air vents must be mounted on any loops
necessary to connect the cabinet to the manifolds.
Cabinet depth = 8.3”
Minimum Cabinet Clearances
Top: 12”, Bottom: 12”, Sides: 12”, Front: 36”
Hang the cabinet on the wall or unistrut mounting frame.
Two keyhole slots and two additional mounting holes are
provided. Be sure the unit is level and mounted directly
to the wall to wood studs as least 2” thick (or equivalent).
The atomizing head manifolds consisting of air manifolds,
atomizing heads, water manifold and unistrut brackets are to
be located as shown on specic layout drawings with each
job. Typically, a “unistrut” style mounting structure is eld
fabricated to support the atomizing manifold.
Dual-Pneumatic
Manifold Installation
1. Install the air/water manifolds per the layout drawing
included with this package.
2. Use only copper, plastic or stainless steel piping as
specied in your print package.
3. Keep runs between control cabinets and heads as short
as possible.
4. Piping runs between control cabinets and manifolds
should be as direct as possible. If loops are unavoidable,
automatic air vents must be supplied and installed.
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WARNING
Do not mount any controls inside the unit or tap power
from any location in the unit, except as stated in these
instructions. Do not place objects near the cabinet. Do not
attach to dry wall without studs.
IV. PLUMBING
Each cabinet has an air inlet, water inlet, air outlet, water
outlet and a drain. All air connections are ¾” and all water
connections, including drain, are ½”.
1. Drain loop must extend 3” above highest location of
heads or water outlet port on cabinet. This loop allows
water pressure to be relieved on system shutdown while
maintaining water volume inside piping.
2. Piping from control cabinet to manifolds should be ¾”
for the air and ½” for the water piping unless otherwise
shown on your job specic drawings provided for your
project.
CAUTION
Any minerals that are in the water will be injected into the
airstream. Your application/process may require some
means of air or water ltration to complete a successful
application. Consult the factory if you should have any
questions. Softening the water only increases the TDS level.
V. CONTROLS
Controls may be supplied by the factory or others. The
following information applies to all controls factory supplied
or furnished by others. All external electrical control
circuits are to be connected to the unit using the terminal
strip located in the electrical compartment. Field wiring
from humidistat to humidier and between safety devices,
such as high limit humidistat and air proving switches,
should be 18 AWG stranded or 20 AWG solid wire. Wall
devices should be mounted at a height similar to that of
a typical thermostat and should be located in an area
that will provide good representation of the overall space
being humidied. Do not mount wall devices directly in
the air stream of a supply grille or room distribution unit.
Control Circuit Connections
ON/OFF
1. Control Input - Unit will operate with any two-position
device. Demand for humidity will close the contact.
2. Limit Input - Unit will operate with any two-position
device. The humidistat contact will open on humidity
rise.
NOTE: Inlet water pressure must be in range of 50-100 psig.
Consult the factory if you are outside this range.
Supply Power
1. Supply power of 120 VAC, 5 amps is required.
2. Field wiring of the main power supply is connected
directly to the terminal strip in the control cabinet. A
ground lug is provided for the ground wire.
3. Install external over current protection and provide wiring
in accordance with the NEC, state and local codes.
4. Power supply must be “clean”; free of spikes, surges
and sags; +10%, -15% of nominal. Ground should be
true earth ground.
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Dual-Pneumatic
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Installation, Operation & Service Manual
VI. START-UP CHECKLIST
This checklist is intended to highlight critical installation
points. A poor installation frequently results in start-up
difculties and always results in less than ideal operation
of the humidier.
1. Ensure all valves and valve cocks throughout the system
(especially at every head) are shut off.
2. Electric power is connected to the control cabinet per
the wiring diagram.
3. All humidistats and external inputs are connected to the
cabinet.
4. Air compressor is primed and oiled and air supply is
connected to the cabinet.
5. Air supply line has been purged and blown down to
remove any installation dirt.
6. Air supply line has been charged, leak tested and has a
minimum of 60 psi pressure to the cabinet.
7. Water supply is connected to the cabinet and has been
purged and blown down to remove installation dirt.
8. Water supply is charged and leak tested and has a
minimum of 50 psi pressure at the cabinet.
9. Drain loop has been connected to the bottom of the
cabinet and has been plumbed to an open drain.
10. Drain piping is installed with a loop a minimum of 3”
above atomizing heads and all piping after the cabinet.
11. All water piping from the cabinet to the manifolds is level
and without loops, or automatic oat type air vents have
been installed at high points to remove trapped air.
12. All air and water lines at the ends for the atomizing
heads have been terminated with hose bibs.
VII. START-UP
After all checklist items are completed (and the total
installation is complete) the Dual Pneumatic system is ready
to start. Refer back to the Start-Up Checklist prior to StartUp below.
IMPORTANT: Before scheduling factory start-up, please have
any issues relating to the “Checklist” resolved. If additional
trips are required, additional start-up costs will be incurred!
VIII. ATOMIZING HEAD OPERATION
The Herrmidier atomizing heads operate with the water
pressure higher than the air pressure. As air enters the
atomizing head, it ows in a centrifugal motion inside the air
nozzle and outside of the water nozzle. As the water enters
the atomizing head, it creates pressure against the diaphragm
and compresses the spring located on the opposite side of
the diaphragm. The motion of the diaphragm pulls the water
seat away from the bottom of the water nozzle allowing water
to ow through the water nozzle. As the water exits the water
nozzle, it becomes atomized by the compressed air inside
the air nozzle and exits the atomizing head as a ne mist.
IX. PRESSURE SETTINGS
IMPORTANT: The air and water pressures to the atomizing
head should only be adjusted when the humidier is at full
output. Do not attempt to adjust the air and water pressure
settings at any other time. The instructions below assume that
the atomizing heads are installed at the same elevation as the
water control section. Adjustment from this standard must be
made to compensate for any elevation differences between
the water control section and the atomizing head manifold.
1. Set the air pressure at 30 psig.
2. Set the water pressure at 33-38 psig according to the
atomizing head capacity as listed below:
a. 6 lb/hr. 35 psig
b. 8 lb/hr. 38 psig
c. 10 lb/hr. 33 psig
d. 12 lb/hr. 35 psig
e. 15 lb/hr. 37 psig
The water pressure settings listed above will allow the
atomizing heads to perform at their rated capacity (lb/hr.).
It may be desired to deviate slightly (1-2 psig) from the
standard settings in order to enhance performance. Slightly
lower water pressures will result in a ner atomized spray
(smaller droplet size). Be aware that any adjustments such
as this will also reduce the rated capacity of the heads. Use
caution accordingly.
1. Blow out air and water lines to the control cabinet.
2. Set all controls to their lowest setting (control and limit
if applicable). This allows the system to be turned “on”
without the atomization process being started.
3. Once the units get the signal to run and unit is turned
“on,” the air solenoid will energize within 5 seconds.
Once the air pressure switch detects sufcient air
pressure, the water solenoid will open.
4. With individual air and water valves at atomizing heads
closed, blow out the air and water lines through the
hose bibs.
5. A factory-trained technician will complete the balance of
the start-up.
Dual-Pneumatic
X. MAINTENANCE
• Air Compressor – follow manufacturer’s recommended
instructions.
• Atomizing Heads – clean dust and debris from outside of
heads as required. If raw water is used, we recommend
removing the atomizing nozzles and strainer screens
once a year for disassembly and cleaning. DO NOT
use a wire or other foreign object to clean nozzle as this
could ruin orice.
• Air & Water Lines – blow out once a year. Check joints
for leaks once a year.
• Humidistats should be checked once per year.
• Solenoid valves should be checked once a year for
proper operation and closure.
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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.
WARNING
Absolutely no other components may be mounted inside
or electrically tapped into the humidier without voiding
the warranty.
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) orice may have been
enlarged due to bent cleaning needle. Replace
parts as required.
iv. Atomizer nozzle (AH-941) orice may have
been enlarged due to improper cleaning or
dirty air. Replace part as required. Standard
air orice sizes for the various heads are as
follows.
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 ow
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 satised.
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 Herrmidier
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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Dual-Pneumatic
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XIV. Wiring Diagram
Installation, Operation & Service Manual
Dual-Pneumatic
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Herrmidifier
®
101 McNeill Rd. | Sanford, NC 27330
P: 800.884.0002 | F: 800.458.2379 | www.herrmidifier-hvac.com | cs@herrmidifier-hvac.com
© Herrmidier 2014. All Rights Reserved.Form No. 268046-001 Rev. 10/14
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