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Herrmidicool
Installation, Operation, & Service Manual
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Installation, Operation & Service Manual
TABLE OF CONTENTS
I. Warranty...............................................................2
II. Unit Operation.....................................................3
Control Cabinet.............................................3
Types of Control............................................3
III. Installation..........................................................4
Operating Conditions....................................4
Mounting.......................................................4
Plumbing.......................................................4
Supply Power................................................5
Controls - Circuit Connections......................5
Setpoint Parameters.....................................7
Programming................................................8
IV. Operating Instructions........................................9
Start-Up Checklist.........................................9
Start-Up.......................................................10
Maintenence................................................10
Diagnostics..................................................10
Extended Shutdown....................................11
Atomizing Head Operation..........................11
Pressure Settings........................................11
Atomizing Head Adjustment........................12
Troubleshooting...........................................12
Parts List.....................................................14
V. Wiring Diagram ................................................15
I. WARRANTY
1. TRION 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 from the date
of shipment.
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 MRA 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 MRA 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.
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5. If, after a reasonable number of attempts to do so, the
TRION 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.
Herrmidicool IOS Manual
Installation, Operation & Service Manual
II. Unit Operation
The Herrmidicool system is an in-duct air/water atomization
system designed to introduce atomized water into the
airstream. The AH-1200 Series includes two sensors and
an air proving switch. From the inputs of these controls, the
EST-1250 microprocessor creates a demand signal that is
forwarded to the AH-1109 atomizer control board.
AH-1200 Series Control Cabinet
Systems provided with the AH-1200 Series Cabinet include
two duct (room sensors optional) sensors and an air proving
switch. One duct sensor, the “control,” monitors the return air
relative humidity. The other duct sensor, the “limit,” monitors
the relative humidity downstream of the humidier.
The EST-1250 Control Board compares the two sensor
inputs to the corresponding user selected control setpoints. If
both humidity readings are below their respective setpoints,
the controller will select the value closest to its setpoint and
determine an appropriate demand signal based on that.
The demand signal is fed from the EST-1250 controller to the
AH-1109 atomizing control board.
Once it receives a demand signal from the EST-1250
controller, the AH-1109 will energize the air solenoid. A
pressure switch on the air control section will verify sufcient
air pressure, then the water solenoid will be energized and
the modulating water valve will open to the appropriate level
as dictated by the demand signal.
As the demand signal varies up and down, the modulating
water valve will open and close accordingly. The air pressure
will remain constant allowing ner droplets to be produced as
the system modulates down and evaporation becomes more
difcult.
When the humidity requirement has been satised, the EST-
1250 will turn off the demand signal to the AH-1109, which
will close the water solenoid, modulating water valve and
the air solenoid. Water pressure is bled instantly to drain via
the drain solenoid. Air pressure is relieved slowly through
the atomizing heads. The air will dry the internal portions
of the head maximizing the maintenance interval. An air-
proving switch (included) ensures there is airow prior to the
humidier turning “On.”
Types of Control
The Herrmidicool System is available with three (3) types
of control – (1) On/Off, (2) Proportional, and (3) P+I – these
provide “good,” “better,” and “best” control.
1. On/Off – Humidity is sensed by a humidistat that
provides digital (On/Off) input to the humidier.
Humidity swings above and below the setpoint based
on tolerance and accuracy of the humidistat. Due to the
limited controllability of an On/Off controlled adiabatic
humidier, this control scheme would only be used in
very specic applications.
Control Cabinet
Herrmidicool IOS Manual
2. Proportional – The variation between the control input
signal and the humidity setpoint results in adjustments to
the unit output. Variations will be smaller than with “On/
Off” control and will be within the control band.
3. Proportional + Integral – The P + I control simply evaluates
the actual humidity vs. desired humidity over a period
of time or integration period. The humidity difference, or
offset, is corrected by an offset correction. This correction
shifts the bandwidth up or down to attempt to eliminate
the offset condition. This type of control is standard with
AH-1200 Series Control Cabinets. Included with these
cabinets are two humidity sensors. One for return or
room sensing, the second for supply or limit sensing.
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Installation, Operation & Service Manual
III. Installation
Allowable Operating Conditions
Ambient Temperature: 40°-120°F (4°-50°C)
Ambient Relative Humidity: 0% - 90%
Line Voltage: 120 VAC,15% to +10% Nominal
Frequency: 50/60 Hz
Supply Air Pressure: 60-200 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.
Mounting
The Herrmidicool system consists of two basic components:
the control cabinet and the atomizing head manifold
assembly.
The control cabinet should be mounted so that the water
outlet of the control cabinet is level with or below the water
manifold in the air handler. Air vents must be mounted on
any loops necessary to connect the cabinet to the manifolds.
Minimum Cabinet Clearances:
Top: 1’ Bottom: 2’
Sides: 2’ Front: 4’
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).
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.
Plumbing
Each cabinet has an air inlet, water inlet, air outlet, water
outlet and a drain outlet. All air connections are ¾” and all
water connections, including drain, are ½”.
NOTES:
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. If
blowdown system is used, drain loop is not required.
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 increase the TDS level.
NOTE:
Inlet water pressure must be in range of 50-100 psig. Consult
the factory if you are outside this range.
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.
Manifold Installation:
1. Install the air/water manifolds per the layout drawing for
project.
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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Installation, Operation & Service Manual
24”
28”
Cabinet Depth = 8.3”
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 overcurrent 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.
Controls
Control Circuit Connections
The Herrmidicool has the capability to utilize one of three
types of control schemes:
1. On/Off
2. Proportional (DDC Interface)
3. Proportional + Integral
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/
BAS 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. If conduit is not used with
the controls wiring, install the black plastic ngered bushing
(in accessory pack) and completely seal with RTV Silicone.
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.
Duct control devices should be mounted in a location where
the humidity and temperature are uniform, usually the return
duct.
Duct high limit devices should be mounted downstream
of the evaporative surface, far enough that under normal
conditions in the air stream, typically 10 ft. The device
should be located such that it can sense humidied air as
it approaches saturation. Do not mount in dead air spaces
such as inside of corners.
Air proving devices should be mounted so that they sense
airow (or the absence of it). Wire the device so that it closes
when airow is present and will open when there is no airow.
The purpose of the device is to prove that airow is present
before humidication is distributed into the duct.
Herrmidicool IOS Manual
Your application specic wiring diagram will detail exact eld
wiring connection points for your unit.
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Installation, Operation & Service Manual
Control Circuit Connections
I. Mode 1--On/Off (OPTIONAL – Limited Application)
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.
II. Mode 2 -- Proportional (Optional – Limited Application)
A. Control Input - Interpreted by the humidier as a
demand of output signal. Input device should be linear.
Unit can accept any VDC or mADC signal within a
range of 0-20 VDC or mADC.
B. Limit Input - Unit may accept any modulating input
within the same ranges as the control inputs listed
above.
1. Proportional VDC or mADC
2. Resistive
3. Two position device
Additionally, a P + I sensor may be used as a limit input.
1. VDC
2. mADC
III. Mode 3 - Proportional + Integral Conguration
1. Control Input - Unit will accept any sensor input that
provides a VDC or mADC signal within a range of 0-20
VDC or mADC that is proportional to the humidity level
in the air. The sensor may be direct or indirect acting
but must not have impedance greater than 500 ohms,
and should be linear. Example - A direct acting 2 - 10
VDC wall sensor will send a 2 VDC signal if the R.H.
level in the space is 10%; it would send a 10 VDC
signal if the R.H. level is 90%. The humidier receives
this input and compares it to the setpoint that has
been programmed into the unit. The microprocessor
modulates the output capacity of the atomizer. The
adjustable integration period will review performance
over the given time and will make tuning adjustments
by shifting the proportional bandwidth to correct for
over or under humidication offsets automatically.
2. Limit Input - Unit can accept any two-position device or
any sensor input as specied above.
1. Two position device
2. VDC sensor input.
3. MADC sensor input.
Operating Instructions
Setpoint Parameters
With each control mode, there is a specic set of operating
parameters and setpoints that apply. All of the setpoints have
been preset at the factory to simplify the start-up procedure.
The following table identies the parameters, setpoints and
preset values that apply to each mode.
Standard units have the modulating limit feature enabled. If
for some unique application, an “On/Off” type or no high limit
is used, the “Limit Input” and “Throttling Range” screens will
not be visible or used.
Parameter Denitions: All Control Modes
Output Rating – Unit design capacity (lbs/hr.)
Capacity Setpoint – Output capacity as a % of the output
rating.
Unit Address – In network installation; “master” is “00”,
“slaves” “01” to “99”.
Run Time – Hours of operation
Control Input – Space or Return Air humidity input
device.
Specic Control Modes (See Chart Page 7)
Control Humidity Setpoint – Desired %RH
Limit Humidity Setpoint – Maximum allowable %RH
Low Humidity Alarm – Indication humidity levels beneath
alarm setpoint.
Proportional Band – Humidity span around control
setpoint where modulation occurs.
Integration Period – Length of time period for %RH
evaluation and adjustment
Throttling Range – Humidity range below limit setpoint
where modulation occurs.
Limit Input – Modulating high limit from a controller or
sensor.
High Humidity Alarm – Indication of humidity levels
exceeding alarm setpoint.
All setpoints have preset default values to simplify
programming – Instructions for adjustment are following.
Your AH-1200 Series unit has been preset for 1 of 3
control modes.
1. On/Off
2. Proportional
3. Proportional + Integral (Standard)
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Control Mode Menu to
Setpoint Parameters
Capacity Setpoint • • • 2 10-100% 100%
Control Humidity Setpoint • 2 20-98% 35%
Limit Humidity Setpoint • • 2 20-99% 75%
High Humidity Alarm • 2 20-100% 99%
Low Humidity Alarm • 3 10-98% 10%
Staging • • • 3 1-3 1
Proportional Band • 3 +/- 2-15% +/- 10%
Integration Period • 3 0-60 min 30 min
Throttling Range • • 3 0-25% 10%
Unit Address • • • 3 0-99 01
Run Time • • • 5 0-999, 999 hrs 0
Limit Input • • 5 Enable/Disable Enable
Control Input • • • 5 Enable/Disable Enable
1 2 3
Adjust
Setpoint
Setpoint Range Preset Values
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Installation, Operation & Service Manual
SETPOINT 35%
Programming
When power is applied (i.e. activating On/Off switch), the liquid
crystal display (LCD) will become active (without user action). A
“signature” screen will appear:
HERRMIDIFIER INC.
HERR 002 VER 5.X
“Ver 5.X” denotes the program level of the microprocessor. The
specic “Ver 5.X” level should be included in any inquiry to a
Herrmidier representative or the factory. After a brief pause, the
‘”Main Menu” will appear:
SYSTEM OFF 000% X 01
MENU 1
The contents of the display provide the following
information:
“System Off” - The “On/Off” button is in the “Off” position.
“000%” - Output capacity in % “0%” = 0 lbs /hr. Range is 0-100%
“X” - Control Mode:
1. On/Off
2. Proportional
3. Proportional + Integral
“01” - Unit Address
“Menu Y”- Designates program MENU:
Menu 1 - Status Items (non-adjustable)
Menu 2 - Setpoint Adjust (non-secured)
Menu 3 - Setpoint Adjust (secured by “password”)
Menu 4 - Network Communication
Menu 5 - Maintenance Adjust (infrequently used options)
Prior to start-up, the operator should review and/or adjust all
setpoints and, if needed, establish the network conguration.
Programming is accomplished as follows:
1. Press the “up” arrow for Menu 2. The LCD screen will read:
2. Press “Enter” to initiate the Menu program. The LCD will
read:
CONTROL 3 01
3. Press the “up” or “down” arrow button to increase or decrease the pre-programmed setting as desired.
4. Press “Enter” to register the setpoint and move to the next
setpoint.
5. Repeat steps “3” and “4” until all of that Menu’s setpoints
are registered.
6. Press “Back” to return to the MAIN MENU. (Menu 1)
7. Press the “up” arrow for Menu 3. The LCD will read:
SYSTEM OFF 000% 3 01
MENU 3
8. Press “Enter”. The LCD will read:
ENTER PASSWORD
NOTE!
Menu 3 is password secured. The setpoints in this menu are
protected from routine adjustment. The unit is shipped new
with three presses of the “Enter” key as the password.
9. To set a new password, six keystrokes are required. The
rst three keystrokes tell the unit that a new password is
being set. The last three keystrokes are the actual pass-
word. To set a new password, press “On/Off”, “up” arrow,
“Enter” and any (3) additional keystrokes - i.e. “up” arrow,
“down” arrow, “Back”. These last (3) keystrokes become
your “password.” Any subsequent revisions to Menu 3 setpoints will require use of this three keystroke “password.”
SYSTEM OFF 000% 3 01
MENU 2
NOTE!
Control Mode may be: (1), (2), or (3). This example pertains
to mode (3). In control modes (1) and (2), not all setpoints will
appear (The table on page 7 identies parameters visible in
each mode).
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NOTE!
If the wrong password is entered, the LCD will read:
INCORRECT
PASSWORD
Refer to step 9. The last (3) keystrokes become the new password.
Herrmidicool IOS Manual
Installation, Operation & Service Manual
10. After establishing the “password”, repeat steps 3 through 5
to program Menu 3. Press “Back” to return to MAIN MENU.
(Menu 1)
11. Press “up” arrow for Menu 5. The LCD will read:
SYSTEM OFF 000% 3 01
MENU 5
12. Repeat steps 3 and 4 to complete Menu 5. The press “Back”
to return to the MAIN MENU (Menu 1)
NOTE!
Programming of the setpoints for the unit is now complete.
IV. OPERATING INSTRUCTIONS
Start-Up Checklist
This Check List 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 through the system
(especially at every head) are shut-off.
2. Electric power is connected to the control cabinet per
the diagram.
3. All sensors, airow switches and external inputs are
connected to the cabinet.
4. Air compressor is primed, oiled and air supply is
connected to the cabinet. Air supply line has been
purged and blown down to remove any installation dirt.
Air supply line has been charged, leak tested and has a
minimum of 60 psi pressure to the cabinet.
5. Water supply is connected to the cabinet and has been
purged and blown down to remove installation dirt. Water
supply is charged and leak tested and has a minimum of
50 psi pressure at the cabinet.
6. Drain loop has been connected to the bottom of the
cabinet and has been plumbed to an open drain. Drain
piping is installed with a loop a minimum of 3” above
atomizing heads and all piping after the cabinet.
7. 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.
8. Air handler is completely operational and has been
balanced.
9. All air and water lines at the ends of the manifolds have
been terminated with hose bibs.
10. Mist eliminators, if used, have been installed properly
over drain pan that is trapped.
11. If used, blowdown tanks, air vent check valve assemblies,
and balancing air regulators are installed as shown on
the installation layout drawing provided with this manual.
12. Call your local Herrmidier representative to schedule
a trouble-free start-up. Minimum two week notice is
required.
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Installation, Operation & Service Manual
Start-Up
After total installation is complete, the Herrmidicool system
is ready to start. Refer back to the Start-Up Checklist prior to
Start-Up below.
IMPORTANT: Before scheduling factory start-up, please
have any issues relating to the “Check List” resolved.
If additional trips are required, additional start-up money
will be required!
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.
Control Mode:
• Mode 1 (On/Off) – Turn the dial to the Off position or
its lowest setting
• Mode 2 (Proportional) – Set the controller to send the
lowest signal in the range (i.e. 0 VDC in a direct
0-10VDC range).
• Mode 3 (P + I) – Set the “control setpoint” through
Menu 2 at least 11% below the “Control RH” display
in Menu 1.
3. Set the high limit to its highest setting (all control modes).
4. Set Control input to get the Herrmidicool System to
attempt 100% capacity as follows:
• Mode 1 (On/Off) – Turn to full “On” or highest
number possible.
• Mode 2 (Proportional) – set controller to send a
full signal (i.e. 10 VDC in a direct 0-10 VDC output
range).
• Mode 3 (P + I) – Set “Control Setpoint” through Menu
2 20% above “Control RH” as displayed in Menu 1.
5. 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.
6. With individual air and water valves at atomizing heads
closed, blow out the air and water lines through the hose
bibs.
7. A factory-trained technician will complete the balance of
the start-up.
Diagnostics
The Herrmidicool humidier includes built-in diagnostics capability to identify potential problems, protect the system, and
minimize service/repair time. Should the system detect a criti-
cal condition, a “fault” warning will be displayed on the LCD.
Certain faults prompt immediate system shutdown to protect
the unit or ductwork. Other faults allow the unit to continue to
operate but alert the operator to potential problems that require
maintenance. Other faults, which are designed for initial system
tune-up or preventative maintenance, are classied as “non-indicating.” These faults are viewed by pressing the “fault” key on
the control panel. The table reects all of the faults the system
is capable of detecting. Please note, however, that certain faults
are unique to certain control modes or networked systems and
are only visible where applicable.
During operation, when an “indicating” fault occurs, the word
FAULT will be visible in the lower right hand section of the LCD.
The red fault light will also be illuminated.
If an “indicating” fault has been detected or a preventative check
is being performed, follow this procedure to determine the cause
of the fault:
1. The LCD must be in the MAIN MENU to access diagnos-
tics. Press “FAULT” key to determine the type of fault.
2. Press the up arrow to determine if there is more than one
fault.
3. If possible, correct the condition causing the fault signal or
plan corrective action.
4. Press “ENTER” to clear the fault signal from the display.
When “ENTER” is pressed, all faults registered in the unit
will be cleared. If the condition causing the fault is not corrected, another fault signal will occur.
5. Under normal operating conditions, pressing the “FAULT”
button will prompt the following display:
NO FAULTS PRESENT
IN SYSTEM
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 the orice.
• Air & Water Lines – blow out once a year. Check joints
for leaks once a year.
• Strainers on air/water control sections should be cleaned
once a year.
• Sensors/transmitters should be checked once per year.
• Solenoid valves should be checked once a year for
proper operation and closure.
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Herrmidicool IOS Manual
Installation, Operation & Service Manual
System Fault Conditions
(See Troubleshooting Section for corrective action)
Fault Operation
Status
Air Flow / High Limit System
Shutdown,
Automatic
Reset (1)
Hi Humidity Alarm (2)(3) Continued
Operation
Low Humidity Alarm (2)(3) Continued
Operation
Humidity Sensor Failed (2) Continued
Operation
unless both fail
Comments
Insufcient airow/
high limit setting
exceeded
Alarm threshold
achieved
Alarm threshold
achieved
Humidity less than
4% or greater than
100%
1. Automatic reset will resume normal operation once the
circuit is closed.
2. Proportional + Integral Control Only
3. Indicating Fault
EXTENDED SHUTDOWN
After an extended shutdown, air and water lines should be
blown out prior to resuming normal operation
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 around the 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 valve disk away from the bottom of the water
nozzle allowing water to ow through the water nozzle. As
the water exits the water nozzle, it become atomized by the
compresses air inside the air nozzle and exits the atomizing
head as a ne spray.
Pressure Settings
IMPORTANT: The air and water pressures to the atomizing
head should only be adjusted when the humidier is at full
output. In other words, when the modulating water valve is
100% open the controls are calling for maximum capacity.
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.
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Installation, Operation & Service Manual
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 Herrmidicool 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.
AH-1200 SERIES
Troubleshooting with Fault Indication
C. Low Humidity Alarm – Humidity in the space or return air
duct being measured by the control sensor has dropped
below the preset alarm level. This alarm is only available
on P + I Control Units (Mode 3 – Standard conguration
for AH-1200 Units).
Possible causes of this alarm:
1. Air handling system limiting output of humidier as
controlled by limits due to psychrometric conditions.
2. Alarm setpoint too close to control setpoint
3. Humidier is powered but not operating and RH is
below setpoint. You may:
a. Turn the humidier “On” to satisfy
b. Adjust the low humidity alarm setpoint.
4. Sensor wiring has failed.
D. Humidity Sensor Failed – This alarm is only available on
P + I Control Units (Mode 3 – Standard conguration for AH-
1200 Units). The sensor has registered a humidity reading
of 100% or more, or 4% or less for more than 5 seconds.
System will operate based on the other sensor until corrective
action is taken. If both sensors fail, the system will shutdown.
Possible causes of this alarm:
1. Failed humidity sensor or wiring.
2. Position of humidity sensor is too close to atomized
spray discharge.
The following alarm conditions are built into the system.
A. Airow/High Limit – The microprocessor has detected a
problem with the On/Off air proving circuit connected to
terminals #5 and 15 on terminal strip #1. Check for 20
VDC on terminal strip #5 to ground and #15 to ground.
If air proving switch is closed, you will have 20 VDC
at both terminals. If you have 20 VDC at one of these
terminals, then there is a problem with the air proving
circuit. Investigate and correct problem. If you have this
fault indicated and the voltage check is correct, consult
factory.
B. High Humidity Alarm – Humidity in the space or return
air duct being measured by the control sensor has
exceeded the preset alarm limit. This alarm is only
available on P + I Control Units (Mode 3 – Standard
conguration for AH-1200 Units).
Possible causes of this alarm:
1. Tampering with the control humidity setpoint
2. Alarm setpoint too close to control setpoint
3. Humidier is powered but not operating and RH
is above setpoint. If system design required this to
happen, you may:
a. Reset your alarm setpoint
b. Turn off humidier at main disconnect until
humidication season returns.
4. Sensor wiring has failed.
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Herrmidicool IOS Manual
Installation, Operation & Service Manual
ALL SERIES
Troubleshooting without Fault Indication
A. Heavy Spray Pattern (Droplets too large) –
1. 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.
2. Individual Heads – These heads are not getting
enough air for one of the following reasons:
a. Foreign matter may be clogging the screen (AH-
21) in the air strainer union of the head. Clean or
replace it.
b. 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.
c. Water nozzle (AH-942) orice may have been
enlarged due to bent cleaning needle. Replace
parts as required.
d. Air 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.
6 lb/hr. – 0.95 mm
8 lb/hr. – 1.10 mm
10 lb/hr. – 1.15 mm
12 lb/hr. – 1.35 mm
15 lb/hr. – 1.45 mm
D. Inoperative Heads-
1. All Headsa. The atomizing heads may be shutdown because
the system controls and setpoints 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.
2. Individual Headsa. 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.
E. 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.
B. Spray Pattern too Light at Full Capacity – Check that the
AH-1109 digital display is reading 100%.
1. 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.
2. Individual Heads – These heads are not getting
enough water for one of the following reasons:
a. 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.
b. 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 air 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.
C. Sputtering Heads – Air pressure at the atomizing heads
exceeds water pressure.
1. Adjust air and water pressures to correct operating
pressures.
2. 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.
Herrmidicool IOS Manual
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13
Installation, Operation & Service Manual
Manifold and Nozzle Spare Parts List
Part # Description Part # Description
AH-940-1-”X” Atomizing Head AH-940-2-”X” Atomizing Head
AH-47 Shutoff Valve AH-47 Air Shutoff Valve
AH-388 Tubing Insert 254257-001 SS Shutoff Valve
AH-163 Nylon Ferrule AH-388 Tubing Insert
AH-44 Tubing AH-44 Tubing
Note: “X” Denotes nozzle rating in pounds/hour (6, 8, 10, 12 or 15 lb/hr).
Part # Description Part # Description
AH-941-1 Air Nozzle AH-941-2 Air Nozzle
AH-942-1 Water Nozzle AH-942-2 Water Nozzle
253206-001 Cap 253206-002 Cap
253207-001 Spring Tension Nut 253207-002 Spring Tension Nut
253208-001 Spring Nut 253208-002 Spring Nut
AH-12 Valve Stem w/ Needle AH-12SS Valve Stem w/ Needle
AH-19A Air Port AH-19ASS Air Port
AH-18A Union Tail Piece AH-18ASS Union Tail Piece
AH-20 Union Nut AH-20SS Union Nut
AH-1RK (Note 1) Rebuild Kit AH-1RK Rebuild Kit
Note: Always specify nozzle rating in pounds per hour on any nozzle parts order.
Raw Water - Brass Deionized/RO Water - SS
AH-163 Nylon Ferrule
Brass Nozzle Consists of: SS Nozzle Consists of:
14 www.herrmidifier-hvac.com
Herrmidicool IOS Manual
V. Wiring Diagram
Installation, Operation & Service Manual
Herrmidicool IOS Manual
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15
Herrmidifier
®
101 McNeill Rd. | Sanford, NC 27330
P: 800.884.0002 | F: 800.458.2379 | www.herrmidifier-hvac.com | cs@herrmidifier-hvac.com
Form No. 267388 10-13 ©Herrmidier 2013. All Rights Reserved.
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