Trion HERRMIDIFIER HERRTRONIC MD Series User manual

HERRTRONIC MD SERIES HUMIDIFIERS
-

i
I 2
Contents Page
Warranty ............................................................. .3
Unit Operation
• Basic operation ........................................................ 4
• Types of controls ....................................................... 5
Installation Instructions
• MOlU1ting ............................................................. 6
• Plumbing " ........................................................... 6
• Supply power ......................................................... 7
• Steam distribution for ducted systems .................................... 8
• Controls
MD control circuit connections .......................... ; ........... 10
External off switch ................................................ 12
Remote alarm option .............................................. 12
• Unit networking ...................................................... 12
• Remote master option ................................................. 13
• Remote display option ................................................. 13
Operating Instructions
• Setpoint parameters ................................................... 14
• Programming ........................................................ 15
• Start-up ............................................................. 17
Start-up check list
................................................. 19
• Diagnostics .......................................................... 20
System fault conditions .............................. . ............ 20
• Maintenance ......................................................... 21
Troubleshooting Guide
• General maintenance notes ............................................. 23
• Operating the humidifier without external controls ........................ 23
• Troubleshooting with fault light illuminated .............................. 24
• Troubleshooting with unit detected "non-indicating" fault .................. 25
• Troubleshooting without unit detected faults .............................. 26
• Output/Input of terminal strips and terminal block ........................ 27
• Illustrations for cylinder replacement .................................... 29
• Exploded view and parts list for model MDS .............................. 30
• Exploded view and parts list for model MDM ............................. 32
• Wiring diagram ....................................................... 34
For MDD Units and Units equipped with Room Distribution Units,
you must review supplementary manuals included with unit.
Herrtronic MD Series Installation and Operation Manual

Warranty
1. The Herrmidifier Company, Inc. warrants to the
buyer or
any user during the duration of the
Warranty that the humidifier 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 humidifier
must be installed, operated and maintained in
accordance with the Installation Instructions,
Operations
and Maintenance Manuals supplied
with the humidifier.
3. In the event of a defect or malfunction in this
product
during the Warranty Period, user may
contact their Herrrnidifier Representative or the
Customer Service Department for a Return
Material Authorization number. Items tagged
with this
number may be returned to the
Herrmidifier Factory Repair Department for
complete reconditioning without charge to the
user for parts or labor. Incidental expenses such
as cost of transporting the humidifier to
Herrmidifier shall be borne
by the user. Upon
completion of the reconditioning, the humidifier
will be returned at no cost to the user. In an
effort to keep equipment on line, Herrmidifier
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 confirmation of improper performance. In
either case, items returned without an RMA
number will not be accepted!
4. Each of the Herrtronic series of steam
generating humidifiers contains a plastic steam
generating cylinder that 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 first
installation of
your Herrtronic humidifier, you
feel the steam generating cylinder is not
operating normally,
you should contact your
Herrmidifier Representative with an
explanation of the problem. However, in the
continuing operation of this humidifier,
replacements of this
part are your responsibility
as
part of routine maintenance.
5. This Warranty does not cover field labor for
repairs to this humidifier 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, the HERRMIDIFIER Company, Inc. is unable
to remedy any defects or malfunctions in this
humidifier, then the user may elect either a
replacement of such product or
part that may be
defective without charge or a refund at the
buyer's original purchase price.
7. This Warranty gives you specific legal rights,
and you may also have other rights which vary
from state to state.
Herrtronic MD Series Installation and Operation Manual 3

Unit Operation
Herrtronic MD: Basic Operation
Controlled humidification requires a very precise
control system. The Herrtronic
MD utilizes a
microprocessor to monitor performance and
maintain humidity. Further, the Herrtronic MD
evaluates the operation and alerts the operator to
problem conditions
and prevents undesirable
operation.
1. Start-up: On initial start-up (prompted by the
humidistat), the
fill valve opens allowing water to
enter the cylinder. When the water level rises to the
electrodes, current will flow
and the water will
begin heating. As the water temperature increases,
its conductivity also increases, accelerating the rate
of temperature increase. When the
output reaches
the" capacity set point," the fill valve closes. The
output capacity may continue to rise slightly
beyond the "capacity set point." As the
water boils,
the water level falls with resulting
output reduction.
2. Normal Operation: Upon achieving "capacity
set point," the system begins operation in a
steady
state mode. Output capacity slowly decreases until
the elapsed "cycle time" opens the fill valve to
replenish the water level until
the" capacity set
-
j
High Drain
Threshold
.e- Capacity
c5 Set Point
Gi
>
CI)
..J
Low Drain
Threshold
Cylinder
Full
point" output is achieved. As the mineral
concentration
in the water increases, the water
conductivity also increases. Accordingly, the rate of
boiling increases. Eventually, the rate of boiling
reduces the
output capacity below the "low drain
threshold" before the "cycle time" initiates the
fill
cycle. At this point, the drain valve opens
discarding the mineral laden (highly conductive)
water, replacing
it with fresh water, that lowers the
mineral concentration until the system is restored to
the steady state mode.
This
steady state operating mode continues with
small increases
in the water level to maintain
output capacity (by exposing new electrode
surface).
3. End-Of-Cylinder Life: Steady State operation
continues
with "fill and boil" and periodic drain
cycles
with ever increasing water levels. Eventually,
the water level reaches the cylinder full electrode,
representing the
maximum allowable water level.
The system
output begins to decrease since there is
no new electrode surface to expose. If the system
operates continuously
without achieving "capacity
set point," an "end of cylinder life" fault will be
displayed.
4 Herrtronic
MD Series Installation and Operation Manual

J
Unit Operation
Types of Control
The Herrtronic MD System is available with (3)
types of control-(l) On/Off, (2) Proportional, (3)
Proportional + Integral:
1. On/Off -Humidity is sensed by a humidistat
that provides an On/ Off input to the humidifier.
Humidity varies above and below the setpoint based
on the tolerance and accuracy of the humidistat.
2. Proportional - A proportional controller
produces a signal (ohms, volts DC, or milliamps
DC) corresponding to the difference between the
control humidity
and the humidity setpoint. The
humidifier output increases as this difference (and
signal) increases. Humidity variations will be
smaller than with
"On/Off" control and the control
humidity will be maintained within the bandwidth
of the controller.
3. Proportional + Integral -Over a repeating time
period the "P+ I" control simply evaluates the
difference between the average control humidity
and the humidity setpoint and adjusts the
bandwidth to minimize the "offset." Optimal
control is attained
in most cases with this
alternative.
£.
NOTE
If your application is unique or water is
excessively "clean"
or "dirty," consult Herrrnidifier
for assistance in matching
your humidifier, water
treatment,
and its control scheme to your
application!
Types of Control
60
. _.-
-_._._._._-
Offset Correction - • • On/Off Control
--- Proportional Control
_.-.-._._.-._._.
... -Proportional + Integral Control
--Set Point
55
• • • • •
, , , , , \
\
\
\
•
•
~
;:;
E
50
:::I
J:
GI
>
;
III
Qj
a:
,
45
Jr
"-.
I
\ , , • , , •
_'f_
.1.
~
~
P +I Bandwidth
40 0 5
10
15
20 25
30
35
40 45
50
55
Time
Herrtronic MD Series Installation and Operation Manual 5

Installation Instructions
Allowable Operating Conditions
Ambient Temperature: 40° F (4°C) to 120° F (50° C)
Ambient Relative Humidity: 0% to 90%
Line Voltage: -15% to +10% of Nominal
Frequency: 50/60 Hz.
Supply Water Temperature: 40° F-100° F (4°C-38°C)
Supply Water Pressure: 20-100 psig
Supply Water Conductivity:
70-1000 micromho (on-off control)
200-1000 micromho (prop or P + I control)
(See Figure 31,
page 24 for proper setting for
softened water)
Maximum Duct Static Pressure:
5" MDM, 7" MDS or MDD units
bolts. Be
sure the unit is level and mounted directly
to
the wall to wood studs at least 2" thick (or ~
equivalent). Operating weights are as follows: ~
MDM-82Ibs.
MDS -1311bs.
MDD -258 lbs.
FIGURE 1
318·0sa.~ 314"0'3
KayholeSIOI
Tyo
5/16"01<1
Tyo
UNIT
SERIES
A
B
C
0
E
F
ADM/MOM AD/MD
5-30#
10-100#
21 26
17
22
2-1/2 5
27 30
21-5/8 22-5/8
2-1/4 4-3/8
If units are mounted in outdoor enclosures,
conditions inside enclosure must be maintained as
shown above. A
WARNING
Mounting
The cabinet is designed to safely contain the
working components of the Herrtronic MD
humidifier and dissipate heat to protect the
electronics. Herrtronic
MD Series electronic steam
humidifiers, room distribution units, steam pipes,
and any accessories should be located in a manner
to facilitate routine inspection and any necessary
maintenance.
The unit should not be located above
(such as false ceilings) or around valuable
property, where a malfunction could cause
damage. Correct positioning
of the Herrtronic MD
humidifier is important to allow for proper
operation and easy maintenance. Minimum
clearance around the cabinet should be maintained
as follows:
CLEARANCES
UNIT
MDM
MDS
MDD
SERIES 5-30# 10-100# 110-200#
Left
2" 2" 2"
Right
20" 20" 20"
Top
12"
12" 12"
Bottom
10" 10" 10"
Four lag bolts, (2) 5/16" and (2) 1/4", are
supplied with the MDS and MDM units which are
designed to be secured to a wall. Install the top two
lag bolts (5/16") according to the dimensions in
Figure 1. Hang the unit on the wall, and then install
the
bottom two lag bolts (1/4") and secure all four
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.
NOTE
To mount the Room Distribution Unit, refer to
the
"supplemental" RDU Installation Instructions.
Plumbing
To make the necessary connections for water fill
and drain, the following steps are required: (refer to
Figure 2 for
drain location)
1. Install an external shutoff valve between the
water supply and the humidifier for ease in
servicing the unit.
2. Connect water supply to 1/2" compression
fitting
on the bottom of the cabinet.
A
CAUTION
Do not use reverse osmosis or demineralized
water treatment without first consulting the factory.
This
water may not be sufficiently conductive to
allow
proper operation. Consult factory if water is
outside the range of allowable conductivities. Do
not use hot water.
3. Connect the 3/4" tube from the accessory
pack to the drain reservoir. Cut hose to necessary
length.
6 Herrtronic
MD Series Installation and Operation Manual

Installation Instructions
WARNING
Be sure that the 3/4" drain tube is not kinked or
bent in a manner to prevent free flowing drainage
from the drain cup to the drain pipe.
4. Insert the other end of the tube into a minimum
6" length of 11/4" minimum I.D. copper line. The
balance of the
drain line should be I" I.D. minimum
with a minimum 1/8" per foot slope. (See Figure 2)
WARNING
If the drain line is exposed, it is recommended that
it be insulated for safety. Do not use PVC drain line
unless "DrainTempering" is enabled (see
page 18).
£
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 (refer to Fig. 31
page 24). Drain water can be tempered to lower its
temperature (refer to
page 18).
Supply Power
1. Insure that adequate service is available to
carry 125% of
rated amp level.
FIGURE 2
314~ MIN. lDJ1 " MAX. 0.0
FlEXIBLE DRAIN CONNECTtON
[
--.~ '"'ECOUMI!NDED
• -----l
1I~ 6" MIN. LENGTH OF 1·114" MlN.I.D. COPPER lINE.
RECOMMeNDED IF PVC IS USED. LOCAL CODES REQUIRE A LOWER
DRAIN ReseRVOIR TEMPERATURE DRAIN WATER, ADD DRAlNTEIIPEAING
BALANCE
OF DRAIN UNETO BE'" MIN.I.D
WIlli AM,,.MUM PITCH OF 118" PER 12" OF RUN
ground wire.
3. Install external overcurrent protection and
provide wiring in accordance with the NEC, state
and local codes.
2. Field wiring of the main power supply is
connected directly to
the contactor (single contactor
units)
or to a power distribution block (multiple
contactor units) located
in the high voltage
compartment. A
ground lug is provided for the
4. Power supply must be "clean"; free of spikes,
surges and sags; +10%,-15% of nominal. Ground
should be a true earth ground.
Engineering Data:
Steam Output / Electrical Characteristics
Kg/Hr = .454 x Lbs/Hr
Kw = .33 x Lbs/Hr
Amps
(1 Ph) =Kwx 1000 .;. Volt.
Amps (3Ph) = Kw x 1000 .;. (Volt.(s) x 1.732)
Min Circuit Ampacity = 1.25 x Rated Electrode Amps (Note: With RDU, add .5 Amps @ 208/24Ov; add .25 Amps @ 480v)
Min Circuit Ampacity determines wire size (AWG)
Herrtronic MD Series Installation and Operation Manual 7

Installation Instructions
Steam Distribution for Ducted
Systems-(See RDU supplement
for Room Distribution Unit)
Each steam cylinder requires at least one outlet
for steam via a
duct distributor or Room
Distribution Unit.
Steam
Distributor Pipes
Herrmidifier supplies stainless steel duct
distributor pipe(s) for use in injecting pure steam
into ducts. Refer to Figures 3,
4, or 5 for proper
placement. A minimum of 3' clearance downstream
is required for most applications. However,
differing psychrometric conditions
may require a
greater
or lesser steam absorption distance. Consult
the factory
if you have any questions or need to
exchange your
standard distribution system for a
rapid absorption CS-Series Distribution system.
~
NOTE
• The rubber
steam hose carries steam to the
distributor pipe and condensate back to the unit. It
must have an 8% (I" per foot) pitch back to the unit.
Support the steam hose so it will maintain the
proper pitch
when in operation or at rest.
• If any low spots are in the steam line or the
unit is mounted higher than the distribution system,
a condensate separator
(EST-250) is available from
the factory.
• If you must split the discharge of one steam
outlet into two ducts with the same static pressure, a
"y" connector (EST-255) is available from the factory.
The length of steamhose after the "Y" connector
must be the same for equal distribution ofsteam.
• Mount the unit as close to the distribution pipe
as possible. Use 11/2" Type L insulated copper
pipe whenever the length of run exceeds 20 feet. Do
not exceed a 30 foot run as the capacity of the unit
will be decreased by as much as 15% and the
increased static pressure could cause problems
with
the fill system.
• Maximum duct static pressure: 5" MDM units,
7" MDS and MDD units.
•Internal duct insulation should be removed in
the ''bulk evaporation" zone (Consult factory
representative).
.Steam holes in the distribution pipe are located
2" from
mounting plate and designed for a
maximum duct wall thickness of I". Consult factory
if special hole locations are required.
• Do not mount the standard distribution pipe in
a vertical downflow or vertical position in a
horizontal flow system. Special pipes are available,
consult the factory.
8 Herrtronic
MD Series Installation and Operation Manual
.-.-- ..... \1
, }
"-

Installation Instructions
Steam Distribution for Dueted Systems-(See RDU supplement for Room Distribution Unit)
DUCT HEIGHT
10"-16"
(254mm) - (406mm)
J
A I DUCT HEIGHT> 16"
T T .I (406mm) I
,...1 __ (7_6_mm_) __ -,--3"_....,.! :'-------L.
1i
1
1i
I
I
FIGURE 3 - SINGLE DISTRIBUTOR PIPE
I' U
I
h= ~ - 5" (127mm)
DUCT HEIGHT> 16"
(406mm)
1--,,...----------_ .... /
6.5"(165mm)
n --+----+-T+-
h I
11
hI3
3.0"
FIGURE 5 - MUlTIPLE
DISTRIBUTOR PIPES
Min.8% (1" PER FOOT)
r:==-
,.I~ ((
No Sags
(2SoImm)
Allowed
+
rc::::;
0
8~~
DD
--
~
Air
Flow
/y-
/
~
Horizontal Duct
I
/
/
,
A.
/
/,
V
Steam dlochargo mUS1 always
be from the top 01 distributor
.A ..J1 ..J1
V V V
f j
"1J
t
A it
-1
V V
FIGURE 7 - STANDARD DUCT DISTRIBUTION
VartJcaI Duct
DUCT HEIGHT
10" -lS"
(254mm) - (40Smm)
DUCT HEIGHT> lS"
I ,-, ./T
f -$-r I
I 'I H
;~ ./j
(76mm) I
I I
h (in). 6+lli.:..1!i)
2
FIGURE 4 - DUAL DISTRIBUTOR PIPES
o
~
8 1/2"
TUBE
TO
DRAIN
EST-2S0
CONDENSATE
SEPARATOR
~ ______ ~
CLOSE AS POSSIBLE
FIGURE 6 - INSTALLATION WITH UNAVOIDABLE LOW SPOT
,...,..,.
--..,
/"VI.
-
r--.
EST-255 -+
~
CONNECTOR
K
[[1
FIGURE 8
Herrtronic MD Series Installation and Operation Manual 9

Installation Instructions
Controls
MD Control Circuit Connections
The Herrtronic MD Series Humidifier has the
capability to utilize one of three types of control
schemes.
1. On/Off
2. Proportional
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 twelve pole terminal
strip located in the low voltage electrical
compartment. The terminal strip is accessed
through the front door or the side electrical
compartment door. Field wiring from humidistat to
humidifier
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 fingered 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 humidified.
Do not mount wall devices directly in the air stream
of a supply grille or room distribution unit.
Duct control devices should be mounted in a
location where the humidity
and temperature are
uniform, usually the return duct. Do not mount in
front of the steam distributor or in a mixing,
turbulent, or isolated area.
Duct high limit devices should be mounted
downstream of the steam
distributors-far enough
that under normal conditions in the air
stream, the
steam has been completely absorbed, typically
10 ft.
The device should be located such that it can sense
humidified 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 air flow (or the absence of it). Wire the
device so that it closes
when air flow is present and
will open when there is no air flow. The purpose of
the device
is to prove that air flow is present before
steam is distributed into the duct.
The following information and diagrams are
shown for each control scheme. Please refer to the
control scheme that your humidifier was set
up for
and follow the diagram for control circuit
connections. The control type
and signal are indicated
on a label adjacent to the controls terminal strip.
Control Circuit Connections
1. Mode l-On/Off
A. Control Input -Unit will operate with any
two pOSition device (See Fig. 9). Demand for
humidity will close the contact.
B. Limit Input -Unit will operate with any two
position device (See Fig. 9). The humidistat
contact will open on humidity rise.
Control Stat
FIGURE 9
II. Mode II-Proportional
A. Control Input -Interpreted by the humidifier
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
(See Fig. 10). Unit may also accept a
resistive signal
0-135 ohms (See Fig. 11).
B. Limit Input -Unit may accept any modulating
input within the same ranges as the control
inputs listed above.
1. Proportional VDC or mADC (See Fig. 12)
2. Resistive (See Fig. 13)
3. Two position device (See Fig. 9)
Additionally, a P + I sensor may be used as a
limit input.
1. VDC (See Fig. 16A wall, 16B duct)
2. mADC (See Fig. 17)
FIGURE 10
FIGURE 11
4
5
H--------iO VDC or
mADC
H-----+-10 Signal
OUT
W
R
B
+L.:... __ _
10 Herrtronic
MD Series Installation and Operation Manual
o

Installation Instructions
FIGURE 12
FIGURE 14A
FIGURE 15
7
8
9
FIGURE 16B
8
9
0
-o
VDC or
mADC
+ 0 Signal
o T1
VDC
OT2
Senor
OT3
T4 (+ Supply)
T5 (-)
T6 (+Out)
0 mADC
Sensor
+ 0
T1 (+ Supply)
T2(-}
OT3
T4 (+ Out)
VDC
Sensor
III. Mode 3-Proportional + Integral
A. Control Input -Unit will accept any sensor
input that provides a
VDC (See Fig. 14A, wall
or Fig.
14B, duct) or mADC (See Fig. 15)
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 an 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.
w
OUT R
+ B
FIGURE 13
4
5
T1 (+ Supply)
60
T2 (-)
VDC
7
OT3
Sensor
T4 (+ Out)
FIGURE 14B
OT1
VDC
7
OT2
Sensor
8
OT3
9 T4 (+ Supply)
T5 (-)
T6 (+ Out)
FIGURE 16A
FIGURE 17
o
1-+-----0
mADC
Sensor
'-----
level in the space is 10%; it would send a 10
VDC signal if the R.H. level is 90%. The
humidifier receives this input
and compares it
to the setpoint
that has beenprogrammed
into the unit. The microprocessor modulates
the
output capacity of steam. 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
humidification offsets automatically.
Herrtronic MD Series Installation and Operation Manual
11

Installation Instructions
B. Limit Input -Unit can accept any two position
device or any sensor
input as specified above.
1. Two position device (See Fig. 9).
2. VDC sensor input (See Fig. 16A, wall or
Fig.
16B, duct).
3. mADC sensor input (See Fig. 17).
External Off Switch
Should a remote off switch be required, follow
the wiring diagram below
(See Fig. 18). Be sure to
remove the jumper wire between poles 1 and 3 on
"Controls Terminal Strip." The remote off switch is
to be wired between poles 1
and 3. This switch will
override the unit
onloff switch to turn the unit off
only, it will not restart the unit. The unit must be
turn back on by the unit onloff switch.
FIGURE 18
Remote Alann Option (EST-1131 or EST-1132)
If the Herrtronic MD humidifier has been
ordered with the remote alarm option, it is
Master Slave
Unit Unit
#1
an
12 :
C2D
Slave •••
Slave Slave
Unit#N Unit#4 Unit#3
FIGURE 19
equipped with a set of relay activated dry contacts.
The relay is energized, closing the contacts,
whenever
an indicating fault condition exists.
When units are networked together, the master's
alarm contacts will close if a fault occurs at either
the master
or one ofthe slaves. The contacts are
connected
at poles 1 and 2 of terminal strip 3
(see page 34).
Do
not exceed the contact specifications:
Contact rating:
24 VAC -3.0 A
24 VDC - 2.1 A
Unit Networking
When networking units together in a
master
Islave configuration, be sure to maintain
polarity between poles 11 and 12 on all units. Units
are to be wired as a parallel circuit. More than one
branch is allowable so that the master unit can be
centrally located (See Fig.
19). A maximum of 29
slave PC boards (29 MDS or MDM units or 14
MDD units) may be configured as a network.
Included in each installation pack is a
120 ohm
resistor. This resistor should be inserted into R28
on the microprocessor board (see Fig. 33) on the
appropriate
end units of the chain. Refer to Fig. 19
for examples.
Slave Slave
Unit#2
Unit#N
[JJ
...
Cl=!
/ t..
~~I
7i.
; I
OR
Master Slave •
••
Slave
Unit Unit
#1
Unit#M
12 Herrtronic
MD Series Installation and Operation Manual

'",
.~1
Installation Instructions
EST-1184 Remote Master Option
The remote master cabinet, EST-1184, can be
used as a remote monitor or as a remote master
controller. When setup as a monitor, the
unit can
access
up to 29 slave units. It is capable of
communicating with each of the slave units
individually to monitor its complete operational
status (output, humidity, faults, alarms, etc.). The
setpoint parameters of any of the slave units can
also be changed from the remote master keyboard.
Configured as a remote master controller, it will
receive a signal from a sensor or DDC system
and
transmit a 0-10 VDC proportional signal for
distribution among the slave units. It is also capable
of communicating with each of the slave units
individually for monitoring
and changing of
setpoint parameters.
EST·1184 ELECTRICAL CONNECTION
7/8" X 1·1/8" DOUBLE KNOCKOUT
LOCATED ONTOP, BACK, BOTTOM
17.50 EXTERNAL FUSE
®
tl • •
tlt:Jt:J
t:lt:J
CONTROL PANEL
DATA PLATE
~
13.50 J
~.oo
Weight 17 Ibs.
EST-1183 Remote Display Option
The remote display unit, EST-1183, allows
remote monitoring of a single MD humidifier from
up to 100 feet away (with shielded cable). The
display features the standard 2 x 20 character LCD
display that will provide feedback from the unit. A
two-for-one ribbon cable connects both the remote
display unit
and the MD humidifier LCD to the
circuit board. Whatever
menu is currently being
viewed
on the MD LCD will be displayed on the
remote display.
NOTE
See instructions included with remote master or
remote display for detailed installation instructions.
EST·1183
r
3.50
l
DISPLAY 6.00
:J
~ ~.2.50
FAULT INDICATOR LAMP ~
Weight 4 Ibs.
Herrtronic MD Series Installation and Operation Manual 13

Operating Instructions
Your unit has been pre-set for 1 of 3 control modes:
1. On/Off
2. Proportional
3. Proportional and Integral
With each control mode, there is a specific 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 identifies the
parameters, setpoints and preset values that apply to each mode. Below the table is a more detailed
description of the setpoint parameters.
Control Mode Menu to Adjust Setpoint MDMPreset
MDS,MDD
Setpoint Parameters 1 2 3 Adjust Range Values
Preset Values
Stearn Output Rating x x x 3 0-999Ibs/hr. 5-30 lbs
/hr.
10-100Ibs/hr.
Electrode Current Rating x x x 3 0-999 Amps as required as required
Capacity Setpoint x x x 2 10-100% 100% 100%
Low Drain Threshold x x x 2 50-100% 85% 80%
High Drain Threshold x x x 3 100-120% 110% 110%
Auto Drain x x x 2 0-99
Days 7 Days 7 Days
Manual Drain x x x 5 Active
/Inactive Inactive Inactive
Drain Tempering x x x 5 Active
/Inactive Inactive Inactive
Control
Humidity Setpoint x 2 20-98% 35% 35%
Limit
Humidity Setpoint(Note31
x x 2 20-99% 75% 75%
High Humidity Alarm x 2 20-100% 99% 99%
Low Humidity Alarm x 2 10-98% 10% 10%
Cycle Tune x x x 3 30-300 Sec.
75
130
90(Notell 150(Notel)
Proportioning Band x 3
+/- 2 to 15%
+/-10% +/ -10%
Integration Period
x 3 0-60 Min. 30 Min. 30 Min.
Throttling
Range(Note31
x x 3 0-25% 10% 10%
Unit
Address
x x x 3 0-99
01
01MDS
00,01 MDD
Leakage Protection x x x 5
On/Off
Off Off
Electrode Run Time x x x 5 0-999,999 hrs. 0 0
Limit InputlNote31
X x 5 Enable
/Disable Enable Enable
Control
Input
x x x 5
Enable/Disable Enable Enable
End of Cyl. Life Setpoint
x x x 5
1- 500 hrs. 6 hrs. 6 hrs.
NOTES:
1. On units where voltage is 380 VAC or greater, the cycle time is 75 seconds. On units where voltage is 240 VAC or less, the cycle time is 90 seconds.
2. On units where voltage is 380 VAC or greater, the cycle time is 130 seconds. On units where voltage is 240 VAC Or less, the cycle time is 150 seconds.
3. If a unit is ordered with the modulating limit feature, the Umit Input will be ENABLED. If an "On/Off" type or no high limit is used, the Limit Input and Throttling
Range screens will have been eliminated.
Parameter Definitions: All Control Modes
Output Rating -Unit design capacity (Ibs/hr).
Electrode Rating -Current rating that corresponds to unit design capacity.
Capacity Rating -Output capacity as a % of the output rating.
Low Drain Threshold -Minimum
output capacity % that initiates a drain cycle.
High Drain Threshold -Maximum
output capacity % that initiates a drain cycle.
Auto Drain -Time in days between system
shutdown and cylinder drain.
Manual Drain -Operator activated cylinder drain
Drain Tempering -Allows mixing of cool inlet water with drain water
for tempering
Cycle Time -Tune in seconds between fill cycles.
Unit Address -In network installation; "master unit" is "00", slaves "01" to "99".
Leakage Protection -Electrically disconnect electrodes during drain cycle.
Electrode Run Time -Hours of cylinder operation.
Control
Input -Space condition humidity input device.
End of
CYL Ufe Setpoint -Unit has not achieved desired output within
specified time.
Specific Control Modes (See Chart)
Control Setpoint -Desired % RH
Umit Input -Modulating high limit from a controller or sensor
Umit Setpoint -Maximum allowable % RH
Low Humidity Alann -Indication of control humidity level below alarm setpoint.
High Humidity Alann -Indication
of control humidity level exceeding alann setpoint.
Proportioning 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.
All setpoints have pre-set default values to simplify
programming-Instructions for adjustment follow.
. I
14 Herrtronic
MD Series Installation and Operation Manual

J
Operating Instructions
Programming
When power is initially applied (i.e. close the
disconnect), the liquid crystal display (LCD) will
become active (without
user action). A "signature"
screen will appear:
"Ver 5.x" denotes the program level of the
microprocessor. The specific "Ver
5.x" level should
be included in any inquiry to a Herrmidifier
representative
or the factory. After a brief pause, the
"Main Menu" will appear:
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.
"X" -Control Mode:
(1) On/Off or
(2) Proportional, or
(3) Proportional + Integral
"01"-Unit Address
"Menu Y"- Designates program MENU:
Menu 1- Report Card (non-adjustable)
Menu 2 - Setpoint Adjust (non-secured)
Menu 3 - Setpoint Adjust (secured by
"password")
Menu 4 -
Network Communication
Menu 5 - Setpoint Adjust (infrequently used
options/ maintenance related)
Prior to start-up, the operator should review
and/ or adjust all setpoints and, if needed, establish
the network configuration.
Programming is
accomplished as follows:
1. Press liD". The LCD will read:
~
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 14 identifies parameters visible in eachmode).
2. Press "Enter" to initiate Menu (2) program. The
LCD will read:
3. Press the "0" or "0" 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 Menu 2
setpoints are registered.
6. Press "Back" to return to the MAIN MENU.
7. Press" 0" two times. The LCD will read:
8. Press "Enter". The LCD will read:
NOTE
Menu 3 is password secured. Step 9 addresses
creation of a password. Please note that the setpoints
in this menu are protected from routine adjustment.
9. Press "On/Off", "0", "Enter" and any (3)
additional keystrokes -i.e. "0", "0", "Back".
These last (3) keystrokes become your "password."
Any subsequent revisions to Menu 3 setpoints will
require use of this "password."
.A
NOTE
If the wrong password is entered, the LCD will
read:
Repeat step
9. The last (3) keystrokes become the
new password.
10. After establishing the "password", repeat
steps 3 through 5
to program Menu 3. Repeat step 6
to return to Main Menu.
11. Press "0" (4) times. The LCD will read:
Herrtronic MD Series Installation and Operation Manual 15

Operating Instructions
12. Repeat step 2 through 6.
~
NOTE
Programming of the setpoints for one unit is now
complete. If there are multiple Herrtronic ~D's
networked together OR you are programnung a
MDD
(110-250 lbs/hr.) unit, continue to step 13.
Otherwise proceed to
START-UP section.
13. Press "0" (3) times. The LCD will read:
~ Thi
The address
in the above screen is now 00. s
I NOTE
allows the "Master" unit access to any "Slave" in
the "Network." Only one Master unit "00" per
Network can be used.
14. Press "Enter". The LCD will read:
This screen will
appear only when power has
been initially applied or re-applied. Wait about (2)
minutes to allow the microprocessor to "Poll" the
network.
15. After returning to the screen described in step
13, press "Enter". The LCD will read:
16. Press "0" if you would like to access slave 2
and "0" again for slave 3, etc.
17. From the screen described in step 15, press
"Enter" to access Slave
01. The LCD will read:
~
NOTE
On MDD units, the address of the slave unit is
factory set as
01. To program the Slave, repeat steps
1 through
12.
NOTE
If communications are not successful, the LCD
will read:
Possible sources for failed communication
attempt:
a) Chosen Slave does
not exist.
b) Slave
unit does not have power connected.
c) Faulty communications wiring
1) Improper polarity of RS-485 (Controls
Terminal Strip Poles
11 & 12).
2) Resistor required to signify the beginning
and end of the "Network" is not installed
correctly.
On individual MDD units, these
resistors are
not necessary. See
"Installation/Networking" section
for
clarification.
d)
It is possible for high levels of Electro-
Magnetic Interference (EMI) to
impede
communications between units. Press "Enter"
to try communications again, or "Back" to
return to "Master" units' Main Menu.
18. To return to "Master" unit (unit address 00)
press" " (3) times. The LCD will read:
19. Press "Enter". The LCD will read:
20. Press "Back" and return to "Master" unit
(unit address 00) Main Menu.
21. To program additional slaves, repeat steps 13-
20. Programming is complete. Proceed with START-
UP section.
16
Herrtronic MD Series Installation and Operation Manual

Operating Instructions
Start-up with Check List
After all programming is completed (and the
total installation is complete), the Herrtronic MD
system is ready to start. At the
end of START-UP
section is a CHECK-LIST. The CHECK-LIST is
intended to highlight critical installation points. A
poor installation frequently results in start-up
difficulties,
and always results in less than ideal
operation of the humidifier.
IMPORTANT: Before any Herrmidifier
representative or the factory is contacted with a
start-up problem, please have the check-list
completed as far as possible.
1. Set all controls to their lowest setting (control
and high limit if applicable). In systems using
distributor pipes, make sure the fan is operating. By
placing the controls at their lowest setting and
turning the unit "ON" at the "ON/OFF" button, the
unit should not
try to initiate production of stearn.
On MDD units it is necessary to tum the Slave "on"
through the communications, Menu 4.
Find the lowest setting in each Control Mode as
follows:
• Mode 1 (On-Off)-Tum the dial to the OFF
position or its lowest setting.
FIGURE 20
Drain Tee
Fill Tube
Drain Cup
with SolenOid
FILL SYSTEM
Fill Metering
Solenoid
• Mode 2 (Proportional) -Set the controller to
send the lowest signal in the range (i.e. 4 rnA in
a direct 4-20 rnA range).
• Mode 3 (P + I) -Set "Control Setpoint" through
Menu 2 at least
11 % below the "Control RH"
displayed in
Menu 1.
2. Set high limit to its highest setting (all control
modes).
3. Set CONTROL input to get the Herrtronic MD
to attempt
100% of capacity as follows:
• Mode 1 (On-Off) - An audible "click" will be
heard when the humidistat is asking for full
output.
• Mode 2 (Proportional) -Set controller to send
Herrtronic MD
a- full signal (i.e. 20 rnA in a
direct
4-20 rnA output range).
• Mode 3 (P + I) -Set "Control Setpoint" through
Menu 2
20% ABOVE "Control RH" displayed
in Menu
1.
4. Once the unit gets the signal to run and unit is
turned "On", the contactor will pull in within 5
seconds, followed
by the fill valve being energized.
The unit will attempt to fill to FULL OUTPUT
(100%) or CYLINDER FULL. If the unit fails to
fiGURE 21
PowerWlre Access
to Steam Cylinder
Fill Valve
Mo,"''"' ,~_ ~
FIIIVaive _/
Adjusting Screw
Electrical
Partition
~ Front 01 Unit
View in from Electrical Access Door
METERING SCREW
Herrtronic MD Series Installation and Operation Manual 17

Operating Instructions
reach 75% of capacity on the initial fill (as shown by
CYLINDER FULL light illuminated
and <75%
Output), you should use the jumper wires enclosed
in the accessory envelope
and arrange them as
shown on the diagrams
on page 22. Be sure to
disconnect power first
and re-tighten each of the
electrode knobs. THIS WILL NOT
BE POSSIBLE
ON UNITS WHICHALREADY HAVE POWER TO
EACH ELECTRODE OR ANY MDM. Before
restarting the unit, drain half the water from the
cylinder using "Manual Drain" found in Menu
5.
5.
If low conductivity water is being supplied, as
indicated
by a low percentage of output (70% and
under) and the CYLINDER FULL light is
illuminated, you may want to artificially increase
the output. This is accomplished
by the following
procedure:
• drain 1/2 the water from the tank using the
manual drain option in
Menu 5.
• add 1Alka-Seltzer tablet
• restart
• repeat if needed.
6. Fill System (Fig. 20) Check Points
• No leaks in system.
• Virtually all the water entering the FILL TEE
should be going down the FILL TUBE as
opposed
to the OVERFLOW TUBE. A slight
adjustment may be needed to the Metering
Screw
(Fig. 21) if water supply pressure is
too high.
7. If you need to "TEMPER" the drain water
because of local codes or low temperature drain
piping
is used, initiate "DRAIN TEMPERING"
(Menu 5).
NOTE
The drain water is TEMPERED or COOLED by
the addition of fresh water while the drain solenoid
is open. The proper rate of fresh water will cool the
drain water and still allow the humidifier to drain
freely. Use the fill valve adjusting screw (Fig. 21) to
regulate the fiowrate of the cool inlet water. The
amount of tempering will depend on incoming
temperature
and pressure of the water supply.
8. Once the water is boiling and steam is being
produced, check the following:
• No leaks in the steam distribution lines or
connections.
• The steam has a clear path from the cylinder to
its distribution paints. Any low spots in the
steam distribution line must be trapped.
9. Unit needs to drain hot water to check proper
drain line installation. Unit may be draining
through normal operation,
but if not, initiate a drain
through the MANUAL DRAIN in Menu
5. Once
hot water is being drained, check the following:
• Steam condensing on .the bottom of the cabinet.
Correct
by lowering the drain line or adding
DRAIN TEMPERING.
• Flash steam entering the steam cylinder
compartment
due to inadequate drain line.
• Flash steam entering the low voltage
compartment if the knockout for the control
wires isn't sealed. This should be sealed even
if
there doesn't appear to be any steam entering
into the compartment.
If conduit is not used
with the controls wiring, install black plastic
fingered bushing
and completely seal with
RTV Silicone.
• Water must drain from unit freely. If there are
restrictions in the drain line, it will send hot
water/steam up the CABINET DRAIN and/or
the OVERFLOW TUBE which will condense
inside the cabinet.
START-UP IS COMPLETED. MAKE SURE
CONTROLLING DEVICES ARE SET FOR
DESIGNED CONDITIONS. PROCEED TO AND
COMPLETE CHECK-LIST. AFTER INITIAL WARM
UP, SHUT UNIT DOWN, TURN OFF MAIN
POWER AND RECHECK TIGHTNESS OF POWER
CONNECTIONS WHILE UNIT
IS WARM
(TORQUE TO 15-20 in-lbs.).
18 Herrtronic
MD Series Installation and Operation Manual

J
Operating Instructions
Herrtronic MD Humidifier
Checklist
o NO UNTRAPPED LOW SPOTS
IN STEAM SUPPLY.
o AIR FLOW IS HORIZONTAL OR VERTICAL UPFLOW.
A SPECIAL PIPE IS REQUIRED FOR VERTICAL DOWNFLOW,
OR A VERTICAL DISTRIBUTOR PIPE IN A HORIZONTAL
AIRFLOW.
o MAKE SURE ALL HIGH VOLTAGE
ELECTRICAL CONNECTIONS ON
STEAM CYLINDER ARE TIGHT
(15-20 inJIbs). I
I
I:
I I
il:,
o 314'MIN IDJ1'MAXOD I /"~
FLEXIBLE DRAIN CONNECTION ~ , ,
o DURINGRLLcya.ECHECKTOSEEIFANY~/ '" ~"t··
WATER IS DRAINING FROM UNIT A LOT OF / " ,
WATER FLOWING OUT OF THE UNIT WOULD /
~f6~~\WC~~~~1ll~J'~[~CENOID ~
OR SUPPLY VALVE TO HUMIDIRER A SMALL
AMOUNT OFWATER IS NOT UNCOMMON ~
o 6" MIN. LENGTH OF H/4' MIN. 1.0. COPPER LINE.
l
.~ 4' RECOMMENOED
, ---..I
S'
RECOMMENDED
rtf
IF PVC IS USED, LCOAL CODES REQUIRE A LOWER
TEMPERATURE DRAIN WATEFL ADD DRAIN TERMPERING
o KNOCKOUT FOR CONTROL WIRING MUST BE
SEALED TO PREVENT RLASH STEAM FROM
ENTERING LOW VOLTAGE COMPARTMENT.
o BALANCE OF DRAIN LINE TO BE l' MIN. 1.0.
WITH A MINIMUM PITCH OF 1/8' PER 12" OF RUN
Herrtronic MD Series Installation and Operation Manual
o MAKE SURE ALL HIGH VOLTAGE
ELECTRICAL CONNECTIONS
AREnGHT.
o POWER SUPPLY:
1. MATCHES OATA PLATE
2. IS PROPERLY GROUNDED
3. CAN CARRY AT LEAST
125% OF RATED AMP DRAW
4. DISCONNECT SUPPLIED
BY OTHERS
19

Diagnostics -Version S.X
The Herrtronic MD humidifier includes built-in
diagnostics capability to identify potential
problems, protect the system,
and minimize
service/repair time. Should the system detect a
critical condition, a "fault"
warning will be
displayed
on the LCD. Certain faults prompt
immediate system shutdown to protect the MD 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 classified as "non-
indicating." These faults are viewed by pressing the
"fault" key on the control panel. The table reflects
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
diagnostics. 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:
In a multi-unit network, the master ("00") unit
will indicate a fault within the entire network. To
find the fault(s), follow steps 1 and 2 for the master
unit. If the display indicates "No Faults Present In
System," then neither the Master, nor any Slave
unit, has any faults.
If any slave has a fault, the LCD will read:
Utilize the communications (Menu
4) from the
Master to access the particular slave with fault(s) to
determine the fault. (Refer to communication
instructions in the programming section). Press the
up arrow key to determine if there is more than one
"slave" that has a "fault."
System "Fault" Conditions
(See Troubleshooting Section for corrective action)
OPERATION
FAULT STATUS COMMENTS
Current Shutdown
and 120% of Capacity
Overload
,,,
Drain Manual Setpoint Exceeded
Reset'"
Contactor Continued Humidification
Failed'" Operation Required
Cylinder Full Continued Humidification
Zero Current Operation required; unit not
functioning properly
Fill Svstem Shutdown and Fill for
15 min. -cannot
Fault" Drain Manual achieve capacity
Rese~l)
setpoint or cyl. full
Zero Electrode Continued Humidification
Current Operation required, no current
draw
Non-zero Slow
Iv Continued Defective drain
Decreasing Amps Operation system
Non-zero Non- Continued Defective drain
Decreasing Amps Operation system
Non-zero Non- Continued Defective
fill system
Increasing Amps Operation
Non-zero Slow
Iv
Continued Defective fill system
Increasing Amp's Operation
Cylinder Full Continued Caused by low water
Operation
conductivi~ foaming,
or end of cyl. life
End of Cylinder Continued Cannot achieve
ca~acity
Life'" Operation and on cylinder
fu for
programmed duration
Air Flow/High Svstem Insufficient airt10w/
Limit Shutdown, high limit setting
Automatic
Reset("
exceeded
Hi Humidity Continued Alarm threshold
Alarm""(" Operation achieved
Lo Humidity Continued Alarm threshold
Alarm(3)",,)
Operation achieved
Humidity Sensor Continued Humidity less than
4%
Failed!})
Operation unless or greater than 100%
both fail
Slave "XX" Has Continued Oper- Slave has fault
Faul~"
ation of Master
Communication Continued Oper- Slave operation
Port Fault ation of Master
unknown
(1) Manual reset requires the problem be corrected and the unit
turned "on" at the keypad
(0) Automatic reset will resume normal operation once the circuit is
closed.
(3) Proportional + Integral Control Only
(') Indicating Fault
20
Herrtronic MD Series Installation and Operation Manual
/