Herrmidifier Herrtronic 6500 Series User manual

HERRMIDIFIER®| www.herrmidifier-hvac.com
Herrtronic®6500 Series
Electrode Steam Humidiers
READ AND SAVE THESE INSTRUCTIONS

Installation, Operation, & Maintenance Manual
2www.herrmidifier-hvac.com Herrtronic®Model 6500
TABLE OF CONTENTS
SECTION I WARRANTY
Preface ...........................................................................................................................................................3
SECTION II UNIT OPERATION
Basic Operation..............................................................................................................................................4
What’s in the Box............................................................................................................................................4
Key Features ..................................................................................................................................................5
Engineering & Application...............................................................................................................................6
SECTION III INSTALLATION INSTRUCTIONS
Mounting.........................................................................................................................................................7
Plumbing.........................................................................................................................................................7
Steam Distribution ..........................................................................................................................................8
Wiring .............................................................................................................................................................9
Supply Power .................................................................................................................................................9
Control Circuit Connections............................................................................................................................9
SECTION IV OPERATING INSTRUCTIONS
Installation Checklist.......................................................................................................................................10
Start-up Instructions .......................................................................................................................................11
Maintenance...................................................................................................................................................12
SECTION V TROUBLESHOOTING GUIDE
Board Test Points ...........................................................................................................................................13
Unit Detected Faults: (Red Service Light On) ................................................................................................14
Non-fault Activated Problems ......................................................................................................................... 15
Wiring Diagram...............................................................................................................................................17
Exploded View................................................................................................................................................18
Parts List.........................................................................................................................................................19

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7. This Warranty gives you specic legal rights, and you
may also have other rights which vary from state to
state.
NOTE: Water quality plays a vital role in the performance
and maintenance requirement of any humidier.
Adjustments to the circuit board may be necessary based
on the incoming water quality. See pages 13-16.
Performance problems associated with water quality are
not warranty issues!
Herrtronic®Model 6500
SECTION I WARRANTY
Warranty
1. HERRMIDIFIER warrants to the buyer or any user
during the duration of the Warranty that the humidier
described in this manual will be free from defects of
material and workmanship for a period of 24 months
from install or 30 months from shipment (excludes
replaceable steam cylinder), whichever comes rst.
2. For this Warranty to be effective, this humidier must
be installed, operated and maintained in accordance
with the Installation Instructions, Operations and
Maintenance Manual(s) supplied with the humidier.
3. In the event of a defect or malfunction in this product
during the Warranty Period, user may contact the
Customer Service Department or their HERRMIDIFIER
Representative for a Customer Relations Management
(CRM) number. Items tagged (on the outside of the box)
with this number may be returned to HERRMIDIFIER
for replacement. Incidental expenses such as cost
of transporting the humidier to HERRMIDIFIER or
labor associated with removal/replacement of the
parts shall be paid by the user. Upon completion of the
reconditioning, the humidier will be returned at no cost
to the user. Items returned without a CRM number will
not be accepted!
4. Every 6500 series steam generating humidier contains
a plastic steam generating cylinder which is to be
considered a routinely disposable part to be changed
at regular maintenance intervals at the user’s expense.
This steam generating cylinder is not covered by this
Warranty. If, after the installation of your 6500 humidier,
you feel the steam generating cylinder is not operating
normally, you should contact HERRMIDIFIER with an
explanation of the problem. However, in the continuing
operation of the humidier, replacements of this part are
your responsibility as part of routine maintenance.
5. This Warranty does not cover eld labor for
repairs to this humidier 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.
6. If, after a reasonable number of attempts to do so,
HERRMIDIFIER is unable to remedy any defects or
malfunctions in this humidier, then the user may elect
either a replacement of such product or part which may
be defective without charge or a refund of the buyer’s
original purchase price.

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4www.herrmidifier-hvac.com Herrtronic®Model 6500
SECTION II UNIT OPERATION
Basic Operation Overview
Controlled humidication requires a very precise control
system. The Herrtronic 6500 utilizes a microprocessor
based control system to monitor performance and maintain
capacity. The humidier evaluates the operation and alerts
the operator to problem conditions and prevents undesirable
operation. (Refer to points on table below.)
1. On initial start-up or a call for humidity, the humidier will
attempt to ll to its full load amp rating. The unit will not
necessarily have a full cylinder of water when capacity is
reached. Water level depends on the conductivity of the
water. The more conductive the water, the more current
that can be passed through and will result in a lower water
level during operation. If the water is not conductive enough
to allow the unit to reach full load amps (full capacity) on
the initial ll, the cylinder full module will stop the ll valve
until the water conductivity increases. The unit will operate
in this mode with repetitive ll and boil cycles until the
unit has concentrated enough minerals in the water to
reach the rated amp level. Once full load amp (FLA) has
been reached, the ll valve will shut off. The unit will now
compare the rate of change of amp draw to a time cycle.
2. Once the water in the cylinder is mineral laden and hence
very conductive, a drain cycle will be initiated. Some or
all of the water in the cylinder will be drained to ush away
the minerals. After the drain cycle and/or the time cycle is
completed, the unit will rell and start the process over.
These cycles will repeat until:
• The call for humidity is satised.
• The cylinder is used up.
• A fault condition occurs.
3. Over a very long time, as the electrodes in the cylinder are
coated with minerals, the water level will slowly increase
to the cylinder full level. Concentration will no longer allow
the unit to reach FLA. The unit will eventually display an
“end of cylinder life” fault by blinking the LED on the front
of the unit at ½ second intervals. Replacement of the
cylinder is required at this point in order for the unit to
continue operating at its rated capacity.
Part No. Qty. Description
267460-001 1Herrtronic 6500-1
267460-002 Herrtronic 6500-2
265160-001 1 Humidistat
265160-001 1 Humidistat (Use as High Limit)
AH-297 1 Air Proving Switch
EST-1138 2 Screw, Lag 5/16 x 2” Long
EST-1563 2 Clamp, Hose, 3/4” - 1 1/2”
EST-206 12” Tubing, Clear PVC Vinyl, 1” OD
EST-207 1 Clamp, Hose SST
267949-001 1 Installation & Operation Manual
General Time of Operation
1. 2. 3.
High Drain
Threshold
Capacity
Set Point
Low Drain
Threshold
Cylinder
Full
Steadily Increase
Water Level
Water Level Output

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Faults:
Overcurrent (Solid Light)
• 138% of Rated Current
• System Shutdown
Fill System (Slow Blink)
• Fill valve open for 24 minutes without achieving
capacity setpoint or cylinder full
• System Shutdown
End of Cylinder Life (Fast Blink)
• 24 hours of operation while on cylinder full without
achieving capacity setpoint.
• System Shutdown
• Operation using water of less than 125 micro-
Siemens is not recommended.
• Typically 500-2000 hours of cylinder operation can
be obtained. Your actual cylinder life may be higher
or lower depending on the exact composition of
your water supply.
Key Features
Adjustable Setpoints (See Figure 13, Page 13)
Capacity
• Range = 50-100%
• Preset at 100%
Low Drain Threshold
• Range = 50-100%
• Preset at 80%
Cycle Time
• Range = 30-180 seconds
• Preset at 60 seconds
DRAIN
CONNECTION
DRAIN SWITCH
FAULT LIGHT
(VISIBLE THROUGH FRONT COVER)
CIRCUIT BOARD
FILL SYSTEM
(INTEGRAL 1" AIR GAP PREVENTS
REVERSE SIPHONING TO POTABLE
WATER SUPPLY; "ADJUSTABLE
METERING VALVE ACCOMODATES
WATER PRESSURES UP TO 100 PSI.")
CYLINDER - REPLACEABLE
GLASS FILLED POLYPROPYLENE
DRAIN SYSTEM
(DRAIN VALVE, ADJUSTABLE
DRAIN THRESHOLD AND CYCLE
TIME PROVIDE EXTENDED LIFE.)
FILL CONNECTION
STRAINER
Herrtronic®Model 6500
Figure 1
NOTE: These setpoints should be adjusted by a
qualied service person only.

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NOTE: The steam distributor pipe is inherently sloped to
return the condensate to the humidier.
An airow proving switch and high limit humidistat are provided
for better system control. If the heating system operates for
short periods at a time and the desired relative humidity level is
not achieved, the humidier can be wired to turn on the blower
when there is a call for humidity. (See Figure 9, page 9.) In this
case an air proving switch will not be necessary, but the high
limit humidistat should still be utilized. (See Figure 8, page 9.)
Herrtronic®Model 6500
Engineering and Application
The Herrmidier 6500 Series Steam Humidiers can be applied
in a variety of applications. The simplest application is to utilize
the steam generated by the 6500 unit to discharge it directly
into the HVAC system ductwork. In this application, a steam
pipe is preferably installed in the system ductwork at least 5
feet downstream of the supply air blower. There should be no
obstructions within the rst 5 feet downstream of the steam
distributor as shown in Figure 2. A minimum duct temperature
of 60°F is recommended. Different psychrometric conditions
may require greater or lesser steam absorption distances.
Temperatures below 60°F may cause condensation to form in
the duct. External lned duct may be used if the thickness is 1”
or less.
Note: Duct liner may be used
with a maximum
thickness of 1".
5 FEET MINIMUM
5 FEET MINIMUM
18 INCHES
MINIMUM
5 FEET MINIMUM
Figure 2
Allowable Operating Conditions
Ambient Temperature 40°F (4°C) to 120°F (50°C)
Ambient Relative Humidity 0% to 90% (non-condensing)
Line Voltage -15% to +10% of normal
Frequency 50/60 Hz
Water Supply Pressure 20psi - 100psi
Maximum Duct Static Pressure 1”

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Plumbing
To make the necessary connections for water ll and drain, the
following steps are required. (Refer to Figure 4 for locations)
1. Install external shutoff valve between the water supply and
the humidier for ease in servicing the unit.
2. Connect water supply to the 1/4” compression tting on the
bottom of the cabinet.
3. Connect the 3/4” tube from the accessory pack to the drain
reservoir. Cut the tube to the length necessary to reach the
drain.
4. Insert the other end of the tube into a minimum 6” vertical
length of the 1-1/4” minimum I.D. drain line. The balance of
the drain line should be 1” I.D. minimum with a minimum
1/8” per foot slope. (See Figure 4.)
SECTION III INSTALLATION INSTRUCTIONS
Mounting
The cabinet is designed to safely contain the working components
of the HERRMIDIFIER 6500 series humidier and dissipate
heat to protect the electronics. Locate humidier, steam pipe
and accessories in a manner to allow routine inspection and any
necessary maintenance. DO NOT install the unit above false
ceilings or around valuable property, where a malfunction could
cause damage. Correct positioning of the humidier is important
to allow for proper operation and easy maintenance. Minimum
clearance around the cabinet should be maintained as follows:
Minimum Clearances
Around Cabinet
Left 6”
Right 12”
Top 6”
Bottom 12”
1. Remove cover by removing four side screws.
2. Remove foam packing from top of cylinder.
3. Two 5/16” lag bolts are supplied with the CFS20/22 unit.
Install the lag bolts according to the dimensions in Figure 3.
4. Hang the unit on the wall and secure the bolts. Be sure the
unit is level and mounted directly to the wall into wood studs
at least 2” thick (or equivalent). Operating weight is 27 lbs.
5. Replace cover and four screws.
Figure 3 (Back View)
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. At least one of the
5/16” bolts must be located on a stud.
FIGURE #3
(BACK VIEW)
9.00 .91
1.31
Ø .625 X .313"
KEYHOLE MTG. SLOT
T Y P. 2
CAUTION!
Do not use reverse osmosis or demineralized water
treatment without rst consulting the factory. This
water may not be sufciently conductive to allow proper
operation. Consult factory if water is outside the range
of allowable conductivities (125-1250 micro-Siemens).
Do not use hot water.
Herrtronic®Model 6500
WARNING!
If the drain line is exposed, it is recommended that it be
insulated for safety. Do not use PVC drain line unless
“Drain Tempering” is enabled.
NOTE: Inlet water pressure must be in the range of
20-100 psig. Consult the factory if you are outside this
range. Softened water may be used but requires that
the low drain threshold be adjusted.
DRAIN LINE TO BE 1" MIN. I.D. TERMINATING
AT THE UNIT WITH 6" OF 1 1/4" I.D. VERTICAL
PLUMBING.
THIS ALLOWS AN AIR GAP BETWEEN THE 1" O.D.
DRAIN TUBE FROM THE UNIT AND THE DRAIN.
1/4" O.D. COPPER OR
POLY TUBE WATER FILL LINE
3/4" MIN. I.D./1" MAX O.D.
FLEXIBLE DRAIN CONNECTION
6" MIN. LENGTH OF 1-1/4" MIN. I.D.
COPPER LINE. IF PVC IS USED OR LOCAL
CODES REQUIRE A LOWER TEMPERATURE
BALANCE OF DRAIN LINE TO BE 1" MIN. I.D.
WITH A MINIMUM PITCH OF 1/8" PER 12" OF RUN
DRAIN RESEVOIR
DRAIN WATER, ENABLE DRAIN TEMPERING.
4" RECOMMENDED
8"
RECOMMENDED
Figure 4

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Distributor Mounting Instructions
Sheetmetal Duct:
Make a 1-1/4” hole in the duct at desired location. Insert duct
distributor and secure with self tapping sheetmetal screws
(supplied by others).
Fiberboard Duct:
Make a 1-1/4” hole in the duct at desired location. Insert duct
distributor and mark the four holes on ange. Drill holes at
marked locations. Fasten distributor with bolts (supplied by
others).
Steam Distribution
HERRMIDIFIER supplies a stainless steel duct distributor for
injecting pure steam into the duct. This can be installed in the side
(recommended) or the bottom (alternate) of the duct. (See Figure
5.) When installing in the side of the ductwork, make sure the unit
is positioned to allow condensate to drain back down the steam
hose to the steam generator. The duct distributor pipe has a built-
in pitch to allow condensate to drain back into the hose. The hose
must be installed with a minimum 8% (1” per foot) pitch back to the
humidier to allow condensate to drain back to the steam cylinder.
(See Figure 5.) The steam hose may be used up to a maximum of
10 feet between the unit and the steam distributor. (Additional hose
may be required.) There can not be sags in the steam hose, as
this will create a trap and will produce back pressure in the steam
cylinder and may blow condensate in the duct. (See Figure 6.)
VERTICAL DUCT
HORIZONTAL DUCT
MIN. 8%
10.00 MIN.
(254 mm)
NO SAGS
ALLOWED
Herrtronic®Model 6500
HORIZONTAL DUCT
INCORRECT
NO SAGS ALLOWED
Note: Internally lined duct should be removed in the
steam evaporation zone.
Figure 5 Figure 6

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Wiring
All eld wiring should be routed up through the holes in the
bottom panel or in the back of the unit.
Figure 7 (Bottom View)
Supply Power
1. Ensure that minimum circuit amperage capacity is 15 amps.
2. Terminals are provided in the electrical compartment for
eld connection of the main power supply legs (single
phase) and a 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: -15% to +10% of nominal.
Electrical Characteristics:
Model 6500-1 6500-2
lbs/hr 4 8
kg/hr 1.8 3.6
Voltage 115 230
Amps 11.5 11.5
kW 1.33 2.66
BOTTOM VIEW
1.56
.75
Ø.88 THRU HOLE
2.37
Herrtronic®Model 6500
Control Circuit Connections
WARNING!
Do NOT install any controls inside the HERRMIDIFIER
6500 cabinet. Installations of any extraneous devices
inside the electrical compartment may cause erratic
behavior of the circuitry and will VOID the warranty.
The control wiring for the humidier is to be connected to
the controls wiring terminal strip located in the electrical
compartment. Terminals #1 and #2 are to power an electronic
humidistat (24 VAC). Terminals #3 and #4 are to connect the
control and high limit humidistat (included). Terminals #5 and
#6 are to connect air proving switch (included). All control wiring
should be 22 AWG or larger. (See Figure 8.) Consult with the
factory if you have any special wiring requirements.
Figure 8
Figure 9
G
R
THERMOSTAT
TERMINALS
267575-001
AUXILARY RELAY
INSIDE CABINET
4
3
2
1
AIR PROVING SWITCH
(INCLUDED)
CONTROL WIRING
56
HIGH LIMITCONTROL
HUMIDISTAT
(INCLUDED)
HUMIDISTAT
(INCLUDED)
TERMINALS FOR POWERING
ELECTRONIC HUMIDISTAT
24V HOT
24V COM.

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10 www.herrmidifier-hvac.com Herrtronic®Model 6500
Installation Checklist
NOTE:
The HERRMIDIFIER 6500 Humidier checklist is provided to help the installer ensure a successful installation. If further
assistance is needed from the HERRMIDIFIER representative or the factory, the checklist is expected to be completed. If
a job site visit is required from the HERRMIDIFIER representative or the factory, and the checklist has not been accurately
completed, additional charges may be applied by the individual(s) representing HERRMIDIFIER. If the visit uncovers a
component malfunction, the parts will be replaced under warranty.
_____________________________________________ ____________________________________________
Project Name Checklist completed by
_____________________________________________ ____________________________________________
Humidier Installer (Company) Checklist completion date
DRAIN RESERVOIR
BALANCE OF DRAIN LINE TO BE 1" MIN. I.D.
DRAIN WATER TEMPERATURE IS SUITABLE FOR PLUMBING.
3/4" MIN. I.D./ 1" MAX. O.D.
FLEXIBLE DRAIN CONNECTION
6" MIN. LENGTH OF 1 1/4" MIN. I.D. VERTICAL COPPER LINE.
IF PVC IS USED, ADD DRAIN TEMPERING.
DURING FILL CYCLE, CHECK TO SEE IF ANY WATER
IS DRAINING FROM UNIT. A LOT OF WATER FLOWING
OUT OF THE UNIT WOULD INDICATE EXCESSIVE
WATER PRESSURE. TURN OFF POWER AND REDUCE
THROUGH METERING FILL SOLENOID OR SUPPLY
VALVE TO HUMIDIFIER. A SMALL AMOUNT OF WATER
IS NOT UNCOMMON.
MAKE SURE ALL HIGH VOLTAGE
ELECTRICAL CONNECTIONS
ARE TIGHT, 15-20 IN-LBS.
POWER SUPPLY:
1. MATCHES DATA PLATE
2. IS PROPERLY GROUNDED
3. CAN CARRY AT LEAST 15 AMPS
4. EXTERNAL FUSED DISCONNECT
PROVIDED BY OTHERS.
SUPPLY WATER (POTABLE)
NO UNTRAPPED LOW SPOT
IN STEAM SUPPLY
AIR FLOW IS HORIZONTAL OR VERTICAL
LOW VOLTAGE TERMINAL STRIP:
1. HUMIDISTAT/HIGH LIMIT HUMIDISTAT
2. AIR PROVING SWITCH
3. 24VAC CONNECTION TO HUMIDISTAT (IF REQ'D)
Figure 10

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9. After approximately a ve-second delay, the ll valve
energizes and water begins to ll the cylinder to the preset
amp level or cylinder full condition, depending on the
incoming water supply. When starting up the unit, it is best
to put an amp clamp on the power leg that passes through
the toroid transformer. Ensure that the humidier lls
to “cylinder full” (approximately 1.5” from the top of the
cylinder), or that the amperage reaches the data label
maximum and the ll valve de-energizes.
10. All units are equipped with a drain tempering feature which
mixes cold ll water with the hot drain water to protect drain
piping. Unit is factory set with drain tempering inactive.
To activate, move drain tempering jumper to ON
position from circuit board. (See Figure 13.) Depending
on your ll water pressure, some adjustment of the ll
metering valve may be necessary to ensure drain water of
less than 140°F. (See Figure 11.)
11. Reset control and high limit humidistats to their desired
settings. Refer to instructions supplied with humidistat.
NOTE: The capacity of the humidier can be adjusted be-
tween 50% and 100% of the maximum level by adjusting
the Capacity Adjustment Pot on the main circuit board.
CAUTION!
Inadequate airow may allow humidity to collect in areas
causing condensation.
Herrtronic®Model 6500
CYLINDER FULL
INTERFACE
ELECTRODE
RELAY
FILL VALVE
ADJUSTING SCREW
POWER
TERMINAL BLOCK
TRANSFORMER
24VAC COM
TERMINAL BLOCK
TERMINAL
STRIP
MAIN CIRCUIT
BOARD
AUXILIARY
RELAY
DRAIN SWITCH
COVER INTERLOCK
SWITCH
NOTE: If upon initial start-up of this humidier the cylin-
der is slow in heating and/or the service light continues
to come on, drain the tank to 1/4 full. Turn off power at
disconnect, obtain some Alka-Seltzer tablets and crum-
ble 1/2 of one tablet (Alka-Seltzer) into the grey ll tee.
Then turn the disconnect on and run the unit. If you have
had to use this step on a 230V unit (6500-2), it is advisable
that you order a GT-176-1 replacement cylinder rather
than the standard replacement cylinder in the future so
this procedure will not need to be repeated.
SECTION IV OPERATING INSTRUCTIONS
Start-up Instructions
1. Check that the humidier is properly mounted and level.
2. Check that the water ll and drain are properly connected.
3. Check that the correct voltage and amperage service are
supplied.
4. Check all controls are wired properly.
5. Check that the steam distributor is properly installed and
that the steam hose has been properly routed without any
kinks or at spots.
6. With power OFF, double check all electrical connections
and plumbing connections to insure that they did not loosen
during shipment.
7. With the control and high limit humidistats at their lowest
settings, turn on the main disconnect. The unit should not
begin operation.
8. Turn the control and high limit humidistats up to their highest
setting. The relay should energize.
Figure 11 (View in from Right Side of Unit)

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cylinder. Be sure that the o-ring is in place on the cylinder
ll/drain port prior to installation. (See Figure 12A.) New
o-ring is included with each replacement cylinder.
5. Clean and check both the ll and drain valves while servicing
the unit.
6. Check the strainer. If it is dirty or restricting the water,
replace it.
7. Install cylinder in unit by pushing downward with a slight
twisting motion, while ensuring proper orientation of cylinder
within cabinet.
8. Reconnect electrode power wires (#32 & #33) and cylinder
full electrode wire (#26). Make sure that all electrical
connections are securely tightened. (See Figures 12B,
12C, and 12D.) Replace cover and four screws.
9. Follow cold start-up instructions on page 11. Monitor amp
draw for several cycles.
Extended Shutdown
Always drain cylinder completely if unit will be off for an extended
period of time. This will preserve the life of the cylinder.
Figure 12B
Figure 12D
Herrtronic®Model 6500
CYLINDER FULL
ELECTRODE
WIRE #26
POWER
WIRE #33
POWER
WIRE #32
115V UNIT
CYLINDER FULL
ELECTRODE
WIRE #26
POWER
WIRE #33
POWER
WIRE #32
230V UNIT
A
C
E
D
E
C
Maintenance
To maintain output, the water level in the cylinder will slowly
move upwards, exposing new electrode to the water as the
electrodes become coated with minerals. Eventually, all of the
usable electrode surfaces will be coated and the cylinder will
be full of water. At this point, the output capacity will begin to
drop and the red “fault” light will come on (fast blink). The unit
will shutdown. This indicates the need to change the cylinder,
typically after 500-2000 hours of operation, depending on the
quality of the ll water supply.
To replace the cylinder
1. Remove cover and four screws while being careful of wiring.
Drain cylinder completely using the drain switch.
2. Turn off power to the unit at the external disconnect.
Disconnect electrode power wires (#32 & #33) and cylinder
full electrode wire (#26) from the cylinder. These connections
are 1/4” quick connects. (See Figures 12B, 12C, and 12D.)
3. Disconnect 1” hose at top of cylinder.
4. Remove cylinder, clean out the drain cup and insert the new
Figure 12A
Figure 12C

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Test Points
Each circuit board (see Figure 13) features three test points to
aid in the troubleshooting process. Each of these test points
works on a 0-5 VDC scale. “0 VDC” = 0%. “5 VDC” = 100%. All
readings are between the test point and ground.
Test Point #1:
Provides exact reading of Time Cycle setting.
30-180% = 0-5 VDC (Factory set: 1 volt)
Test Point #2:
Provides exact reading of Low Drain threshold.
50-100% = 0-5 VDC (Factory set: 3 volts)
Test Point #3:
Provides maximum percentage of output.
50-100% = 0-5 VDC (Factory set: 5 volts)
Herrtronic®Model 6500
SECTION V TROUBLESHOOTING GUIDE
All HERRMIDIFIER 6500 Series humidiers are manufactured
under strict quality control and are subjected to a complete
operational test prior to shipment. All circuit board adjustments
are made at the factory and should not be adjusted beyond the
guidelines set in this troubleshooting guide without rst consulting
a factory representative. The following information is for your
reference. If you still experience difculty after trying these
remedies, contact your HERRMIDIFIER representative.
WARNING!
The HERRMIDIFIER 6500 Series Electronic Steam
Humidier cabinet was designed to house and shield
the components from outside interference. Absolutely
NO other components may be mounted inside or
be electrically tapped into the humidier without
HERRMIDIFIER’s express written permission. Failure to
heed this warning will void your warranty.
Figure 13
FAULT LED
CAPACITY ADJUSTMENT
LOW DRAIN
THRESHOLD POT
CYCLE TIMER POT
DRAIN TEMPERING
JUMPER
TEST POINT #1
(DRAIN THRESHOLD READING)
TEST POINT #2
(EQUILIBRIUM VOLTAGE READING)
TEST POINT #3
(OUTPUT CAPACITY)
J1 CONNECTOR

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14 www.herrmidifier-hvac.com Herrtronic®Model 6500
Unit Detected Faults (Red Service Light is ON)
Problem / Symptom Probable Cause Reason - Correction
Overcurrent (Solid Light)
The alarm condition occurs when an
overcurrent situation (>138% of rated
current) has occurred and the humidier
has shut down to prevent any damage.
This alarm indicates that there has been
a signicant reduction in resistance
between the main legs of the supply
power and the humidier has been shut
down to prevent damage and should be
serviced before it is restarted. Fault LED
R33 will be illuminated (solid - no ash).
Dead short between electrodes. Replace the steam cylinder. Check
resistance between electrodes with power
OFF.
Restricted or blocked drain. Clean and inspect drain system.
Restricted ll system. Clean and inspect the ll system. Check
for restriction or loss of supply pressure.
Incoming water conductivity is outside the
range of normal circuit board settings.
Consult the factory for options.
Check amp draw to unit during start-up.
If amp draw greatly exceeds rated amp
draw, the drain threshold pot, labeled “Low
Drain Threshold Pot”, must be increased
2% to increase the frequency and duration
of drains to reduce the conductivity inside
the cylinder.
Manually drain the unit and restart.
End of Cylinder (Fast Blink)
This alarm condition occurs if the
humidier is unable to reach full output
over a 24 hour timeframe. This alarm
indicates a need to change the cylinder,
that the water supply is low in conductivity,
or that a foaming condition exists.
End of cylinder life – Cylinder life is
typically between 500 and 2000 hours,
depending on incoming water supply.
For emergency use, you may restart the
humidier with the Capacity Adjustment
Pot, at a lower level to allow operation
until a replacement steam cylinder can
be obtained. To clear the fault, turn the
main disconnect to the unit “off” and then
back ON.
If incoming water supply is less than 125
micromho, the unit may not be able to
pass the rated current through the water.
See NON-FAULT ACTIVATED
PROBLEMS GUIDE – “Unit lls to the
cylinder full condition and remains cold.”
Foaming condition exists. Flush and ll the steam cylinder several
times and restart. If it persists, you must
lter or treat the water to remove the
foaming agent. See circuit board settings
on previous page if supply water is
softened. See NON-FAULT ACTIVATED
PROBLEMS GUIDE – “Water foaming
inside the cylinder.”
Fill System Fault (Slow Blink)
This alarm condition occurs when the ll
valve has been energized for a 24 minute
timeframe. The humidier has been
shutdown to prevent any damage.
Loss of or restricted water supply. Check ll system.
Leaking drain system. Check drain system.
Defective drain valve. Repair and replace as required.
Defective ll valve. Repair and replace as required.
NOTE: The three fault conditions outlined above will cause the humidier to shut down and the fault light on the front of
the unit to illuminate. To clear these faults, the main power must be turned OFF and back ON again.

Installation, Operation, & Maintenance Manual
15
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Herrtronic®Model 6500
Non-Fault Activated Problems
Humidier turned ON but will not
operate
Check power supply.
Check circuit breaker.
Check connector J1 on the circuit board and ensure that it is plugged into the circuit board
properly and that no wires are loose.
Ensure that there is 24 VAC between pole #9 and #11 connector J1. If not, check wiring.
Place jumper between controls wiring terminal strip #3 and #4. If unit operates, check controls
settings and wiring (control stat and high limit humidistat).
Check door interlock.
Unit turned ON. Contactor pulled
in, but no water is entering the
cylinder.
Check external shutoff valves and open if closed.
Check strainer and ll valve for clogs. Turn adjusting screw.
Check ll valve coil to determine if it is receiving 24 VAC. If so, replace the valve.
Check for break in wiring.
Excessive arcing in cylinder Check drain valve and ensure that when it activates it drains freely. Clean if necessary.
Replace valve if defective.
Check water supply. If it is softened, increase the Low Drain Threshold Pot (POT 2) up to
XX%. (See Figure 13.)
Use high conductivity settings if water supply is very hard, >750 micromho.
Unit lling slower or at the same rate as the water is boiling, causing over concentration and
foaming. Check restriction in ll line. Adjust the metering ll valve to allow greater ow of
water. (See Figure 11.)
Have water analyzed. If iron content is greater than .1 mg/liter, a lter will have to be used.
Consult factory with water analysis.
Unit lls to the cylinder full condition
and remains cold
Check between Test Point #3 and ground with a multimeter set on VDC scale. Conrm the
circuit board is seeing low current ow (<3.5 VDC). Proceed to next step.
If on initial ll, unit reaches less than 70% of rated capacity (3.5 VDC on Test Point #3), adjust
the drain threshold pot, POT 2, down 2-3%. Manually drain the unit down completely and add
½ Alka Seltzer tablet via the ll tee (GT-120). Restart the unit while monitoring the amp draw.
Fill unit ¼ full and turn “off” for several minutes to allow tablets to dissolve. Restart unit. If
amperage rises rapidly, it may be necessary to dilute the water. If amperage rises slowly, add
another Alka-Seltzer tablet.
Check that drain valve is sealing properly.
Check the water conductivity and consult the factory.
Unit turned ON and cycles for a
short period of time. Then it stops
in the middle of a ll cycle and will
not reset until boiling stops.
Check cylinder ll interface connections.
Check cylinder connections. (See Figure 12B.)
Check items in next troubleshooting tip concerning foaming.
Check amperage between cylinder full electrode and cylinder full interface terminal #1. If it is
greater than 7.0 mA AC, take a ll water sample and consult the factory.

Installation, Operation, & Maintenance Manual
16 www.herrmidifier-hvac.com Herrtronic®Model 6500
Problem/Symptom Reason - Correction
Water “foaming” inside the cylinder Check drain valve and ensure that water drains freely. If necessary, clean or replace valve if
defective.
Check water supply. If it is commercially softened, either increase the drain threshold (POT2)
to 85% or reconnect the unit to raw water. Drain and restart the unit. If the unit is connected
to a hot water line, reconnect to the cold water line.
If steam line is hard copper, drain cylinder and test unit operation disconnected from steam
line to ensure ux from solder joints is not causing foaming.
Observe the ll tee (GT-120). If water is going down the overow and the water level is low:
• Check to ensure that static pressure in the duct is not forcing water down the overow
instead of allowing water to enter the cylinder.
• Adjust the ll metering valve to regulate the water ow to the cylinder.
• Unit lling slower or at the same rate as it is boiling off, causing over concentration and
foaming. Fill rate must be increased. Open metering valve.
• If the ll valve is already fully open, get a water analysis and consult the factory.
Cylinder lls and overows Check cylinder wiring (See Figure 12.)
Check wiring of cylinder full interface.
Replace the circuit board.
Consult the factory after obtaining a water analysis
Unit cycle ON and OFF rapidly Check location and setting of high limit humidistat.
Cabinet leaks Check for loose connections.
Fill tube out of ll tee.
Steam cylinder out of drain cup.
Cabinet drain backing up, kink in drain line.

Installation, Operation, & Maintenance Manual
17
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Herrtronic®Model 6500
6500-1
WIRING DIAGRAM
6500-2
WIRING DIAGRAM
1
2
3
4
5
6
7
8
9
10
TOROID
11
R1 RELAY
R2 ELECTRODE RELAY
FILL VALVE
DRAIN VALVE
DOOR INTERLOCK
SWITCH
J1
24V
115V
CF
ELECTRODE
HUMIDISTAT
24VAC
ELECTRODES
R2 R2
1 2
3
4
POWER TERMINAL
L2 L1 G
DRAIN
SWITCH
TERMINAL STRIP
123456
24V COM
BLOCK
GRD TO
CHASSIS
CYLINDER
FULL INTERFACE
TRANSFORMER
AUX.
AIR
PROVING SWITCH
6
8
10
5
4
2
1
1
2
3
4
5
6
7
8
9
10
TOROID
11
R1 RELAY
R2 ELECTRODE RELAY
FILL VALVE
DRAIN VALVE
J1
CF
ELECTRODE
HUMIDISTAT
24VAC
ELECTRODES
R2 R2
1 2
3
4
POWER TERMINAL
L2 L1 G
DRAIN
SWITCH
TERMINAL STRIP
123456
24V COM
BLOCK
GRD TO
CHASSIS
CYLINDER
FULL INTERFACE
TRANSFORMER
AUX.
AIR
PROVING SWITCH
DOOR INTERLOCK
SWITCH
24V
230V
TRANSFORMER
6
8
10
5
4
2
1
#1
#2
#3
#4
#5
#6
#7
#8
#9
#10
#11
#12
#13
#15
#35
#16
#17
#18
#19
#20
#21
#23
#34
#24
#25
#33
#32
#26
#31
#27
#22
#14
FUSE
2A
#28
#1
#2
#3
#4
#5
#6
#7
#8
#9
#10
#11
#13
#16
#17
#18
#19
#20
#21
#23
#34
#24
#25
#33
#32
#26
#31
#27
#29
#28
#12
#15
#35
#14
FUSE
2A
#22

Installation, Operation, & Maintenance Manual
18 www.herrmidifier-hvac.com Herrtronic®Model 6500
EST-1530
1845
GT-118
GT-116
FILL SUB-ASSEMBLY
138586-001
GT-120
EST-207
EST-1533-3
DRAIN SUB-ASSEMBLY
1095
EST-1012
GT-262
EST-596
EST-207
EST-003A
GT-335
EST-1512
GT-322
EST-1225-KIT
EST-353
EST-105A
267575-001
GT-262
EST-1618
GT-116
(6500-1)
GT-176-1
GT-202
(6500-2)
GT-116
GT-116
GT-153
267640-001
4060
CYLINDER
ASSEMBLY
CYLINDER
ASSEMBLY

Installation, Operation, & Maintenance Manual
Parts List
1095 Hose clamp SS
138586-001 Drain switch
1845 Door interlock
267575-001 Aux relay, 24VAC
267640-001 Fill loop
268390-001 Power wire assembly replacement (not shown)
4060 Fitting, 1/4” bulkhead
EST-003A Cylinder full interface
EST-105A Toroid transformer
EST-1225-KIT Drain reservoir kit
EST-1512 Transformer, 115/230V to 24VAC
EST-1530 Terminal block
EST-1533-3 Drain valve kit
EST-1618 Tubing, 1” O.D. silicone
EST-207 Clamp
EST-207 Hose clamp SS
EST-353 Bushing, short 3/4” I.D.
EST-596 Steam hose
GT-116 Celcon compression nuts
GT-118 Fill valve
GT-120 Fill tee
GT-176-1 Low conductivity steam cylinder assembly (standard 115V units)
GT-202 Steam cylinder assembly (standard 230V units)
GT-262 Hose, 1/2” I.D. overow
GT-322 Main circuit board
GT-335 Electrode relay, 2 pole, 20A
19
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Herrtronic®Model 6500

Form No. 267949-001 Rev. 11/16
HERRMIDIFIER®
101 McNeill Rd. | Sanford, NC 27330
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