VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
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Warnings and cautions
WARNINGS AND CAUTIONS
WARNING
Indicates a hazardous situation that could result in death or
serious injury if instructions are not followed.
WARNING
Read all warnings and instructions
This page provides important safety instructions; it is intended to supplement — not replace — the humidifier's Installation,
Operation, and Maintenance Manual (IOM). Read the IOM that was provided with the humidifier before performing
service or maintenance procedures on any part of the system. Failure to follow all warnings and instructions could
produce the hazardous situations described here and in the IOM, resulting in property damage, personal injury, or
death.
If the IOM is missing, go to www.dristeem.com to download a replacement.
Hot surfaces and hot water
Steam humidification systems have extremely hot surfaces, and water in tanks, electrode cylinders, steam pipes, and
dispersion assemblies can be as hot as 212 °F (100 °C). To avoid severe burns, allow the entire humidification system to
cool.
Follow the cool-down procedure in the humidifier's IOM before performing service or maintenance procedures on any
part of the system.
Shut down the energy source
Before performing service or maintenance procedures on any part of the humidification system, verify that all energy
sources are off. Energy sources can be electricity, gas, steam, or hot liquid. Failure to shut down the energy source could
result in carbon monoxide poisoning, fire, explosion, electrical shock, and other hazardous conditions. These hazardous
conditions could cause property damage, personal injury, or death.
Contact with energized circuits can cause property damage, severe personal injury or death as a result of electrical
shock or fire. Do not remove the shroud/cover, electrical panel cover/door, access panels, or heater terminal cover until
electrical power is disconnected.
Follow the shutdown procedure in the humidifier's IOM before performing service or maintenance procedures on any
part of the system.
CAUTION
Indicates a hazardous situation that could result in damage to or
destruction of property if instructions are not followed.
CAUTION
Hot discharge water
Discharge water can be as hot as 212 °F (100 °C) and can damage the drain plumbing.
Humidifiers equipped with a water tempering device need fresh make-up water in order to function properly. Make sure the water
supply to the water tempering device remains open during draining.
Excessive supply water pressure
Supply water pressure greater than 80 psi (550 kPa) can cause the humidifier to overflow.
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
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Vapor-logic capabilities
ACCURATE, RESPONSIVE CONTROL
The Vapor-logic controller provides accurate, responsive RH control. PID control
tunes the system for maximum performance.
Modbus®, BACnet®, or LonTalk® allow interoperability with multiple building
automation systems. Modbus is standard, and BACnet or LonTalk are available
options.
Web interface, provides the capability to set up, view, and adjust humidifier
functions via Ethernet, either directly or remotely through a network.
USB port allows easy firmware updates, and data backup and restore
capability.
Real-time clock allows time-stamped alarm and message tracking, and
accurate drain and flush scheduling.
OVERVIEW
Auxiliary temperature sensor/transmitter allows temperature compensation
control to prevent window condensation, or air temperature monitoring, such
as in a duct.
Programmable outputs allow remote signaling and device activation.
Multiple-humidifier control allows staged control of up to 8 humidifiers with
one controller.
Controller data, such as RH, air temperature, water use, energy use, and
alerts can be downloaded to a PC for viewing and analysis. RH, alerts, and
messages can also be viewed on the display and Web interface.
More capabilities on the next page >
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
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OVERVIEW
Vapor-logic capabilities
Enhanced diagnostics include:
• Test outputs function using display or Web interface to verify component
operation
• Test humidifier function using simulated demand to validate performance
Insert a USB flash drive
into the Vapor-logic
board’s USB port to
perform software
updates, download
data logs, and back
up and restore data.
Use the
Vapor-logic
display
or the standard Web interface, shown here, to
control your humidification system.
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
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Humidification system overview
FIGURE 3-1: TYPICAL HUMIDIFICATION SYSTEM LAYOUT (GTS HUMIDIFIER SHOWN)
Dispersion assembly
Humidifier
OVERVIEW
Connect a computer directly to the
Vapor-logic board, or through a
network, to use the Web interface
Vapor-logic
display
OM-7942_VL
Every humidification system with a Vapor-logic controller has a display connection and an Ethernet
connection for connecting to a Web interface on a computer. A GTS humidifier is shown here,
with display mounted on the cabinet. Other types of DriSteem humidifiers can have the display
contained within a control cabinet or mounted remotely.
OPERATING CONDITIONS
The Vapor-logic main board and display must be operated and stored within
the limits listed below. Exceeding these limits can result in poor display
performance and/or damage to the unit.
Main board
Operating temperature: 32 °F to 158 °F (0 °C to 70 °C)
Storage temperature: -40 °F to 185 °F (-40 °C to 85 °C)
Operating humidity range: <95% noncondensing
Display
Operating temperature: 32 °F to 158 °F (0 °C to 70 °C)
Storage temperature: -22 °F to 176 °F (-30 °C to 80 °C)
Operating humidity range: <90% noncondensing
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
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OVERVIEW
Vapor-logic board
FIGURE 4-1: VAPOR-LOGIC CONTROL BOARD
Power connection
Factory connection points
for water level control,
gas valves, etc.
: Components
Factory connection points for drain, fill, etc.
Ethernet connection for computer network and/or BACnet/IP
Display connection
Field connection points for transmitters,
airflow switch, etc.
Field connection terminal labels
(white border)
Multi-tank connection
BACnet or Modbus connection
Connection pins for optional LonTalk module
The photo above shows key components of the Vapor-logic control board. See the illustration on the next page for more detail.
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
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Vapor-logic board: Connections
FIGURE 5-1: VAPOR-LOGIC CONTROL BOARD CONNECTIONS
D4 , 21 VDC indicator
P1:
24vac = Power to board
= Ground for power return
P2:
Low = Low water probe
Mid = Mid water probe
Top = Top water probe
= Ground for water probe
P3:
GV1 = Gas valve 1 (24vac input)
BT1 = Blower tach 1 (pulse tach input)
LW = Flue or tank overtemp
(24vac input)
FPsw = Flue pressure switch
P17: (all are 24VAC outputs)
CT1 = Ignition module 1
Drain = Drain valve
Fill = Fill valve
P16: (all are 24VAC outputs)
SDU = Space Distribution Unit/Area type
NO-2 = Normally open #2.
NO-2 SDU PV/CA
24Vac CAsw 24Vac PVsw
21VDC TS
21VDC DHL 24Vac AFsw
NO-1 C-1 C-2
21VDC RH
J402 Master enable jumper
* See Caution below.
P15:
n/a
P14:
TS = Aux. temp. sensor or temp. comp.
sensor (4-20 mA input)
temp. comp. sensor
P13:
AFsw = Airflow proving switch (24vac input)
24vac = Power to airflow proving switch
DHL = Duct high limit switch/transm.
(4-20 mA input)
21vdc = Power to duct high limit switch
or transmitter
P12:
Programmable relay #1
* See Caution below.
C-2 = Common #2
C-1 = Common #1
NO-1 = Normally open #1
P11:
= Ground for demand signal by others
RH = Space RH input (RH transmitter, dew point
transmitter, humidistat, or demand signal
by others (4-20 mA or 0-16vdc typical)
21vdc = Power to space RH sensor
OVERVIEW
Notes:
• Programmable relay functions are defined using the display or Web
interface during the Setup process.
• For most applications, field connections are made at terminals on the
board that are surrounded with a white border (P7, P8, P11-P16, P20).
CAUTION
Programmable relay maximum electrical ratings
Programmable relays are rated for 125 VAC, 3 Amp or
30 VDC, 3 Amp maximum. Exceeding these maximum
ratings can cause the relay components on the
Vapor-logic board to fail.
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
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OVERVIEW
Display
FIGURE 6-1: USING THE VAPOR-LOGIC DISPLAY
Typical Home screen
The banner at the top of the home
screen displays the model number
or name of the humidifier. Go to the
settings menu to give the humidifier
a name and view the serial number.
View the current mode
of the humidifier via the
color indicator. Change
the mode by touching the
edit icon.
Setpoint is the relative
humidity percentage that the
humidifier tries to maintain
in the controlled space.
Default: 35%
Range: 0-100%
View tank activities
information: humidifying,
filling, skimming, flushing, etc.
The time and the date as stored on the
Vapor-logic control board.
Space RH is the relative humidity
reading in the space that the
humidifier serves.
Output indicates graphically the
current humidity production of the
humidifier. Maximum=humidifier
operating at full capacity. For more
information touch the output graphic
to see the steam production in lbs/
hr and as a percentage of the tanks
capacity.
Change the security
of the humidifier,
backup or restore,
access test mode, and
other custom settings.
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
6
Help: Touch the question
mark icon to display help
information about the items
on that screen.
View all current
and past humidifier
parameters.
Access all the active alerts that affect the
operation of the humidifier.
Page 11
Web interface
FIGURE 7-1: USING THE VAPOR-LOGIC WEB INTERFACE (SETUP SCREEN SHOWN)
Click on a tab label to move to another screen
OVERVIEW
Click on
CHANGE to
change value
Click here
to view
alarms
Click here to
view messages
Click on label
to contract (–)
or expand (+)
menu item
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
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Page 12
INSTALLATION
Pre-installation Checklist
☐ See Figure 8-1 for field terminal block locations. Note
that field wiring connection locations on the Vapor-logic
board are surrounded with a white border.
☐ See the figure on the next page for instructions on how
to make wiring connections.
☐ See the wiring drawings and manuals that shipped
with your humidifier.
☐ When making field connections, do not route low
voltage wires near line voltage wires. Do not route low
voltage wires in the same conduit as line voltage wires.
☐ Humidistat, room/duct transmitter, temperature sensor,
and airflow proving switch wiring must be minimum
18-gauge (1 mm2) plenum rated, shielded (screened),
twisted pair wire with a bare drain wire for grounding.
☐ Connect the shield (screen) wire [with a length less than
2" (50 mm)] to the shield (screen) ground terminal on
the electric subpanel. Do not ground the shield (screen)
wire on the humidistat or transmitter end.
FIGURE 8-1: VAPOR-LOGIC CONTROL BOARD DETAIL
Board detail showing white border
Field connection terminals.
Terminals P-11 through P-16
have a white border on the
Vapor-logic board. This is
where you will make most of
your field wiring connections.
Field connection terminals.
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
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Page 13
Pre-installation Checklist
P1
P2
P3
P4
P5
P6
P7
P8
P9
P10
P17
P18
P19
SSR/BLSteam
Fill
Drain
SDU
PV/CA
CT/I1CT/I
2
CT/I
3
CT/I
4
GV1
AI2
Fieldbus
24VACTop
Mid
Low
BT1
LWFPsw
lsw
TT
GV2
BT2GV3
BT3
GV4
BT4
AI1
DSTEEM
SW1
Optional LonTalk® card location
P20
USB
FIGURE 9-1: VAPOR-LOGIC TERMINAL BLOCK DETAIL AND CONNECTION INSTRUCTIONS
Tighten screw after
wire is inserted.
Maximum torque is
3 in-lb (0.34 N-m)
Remove insulation
from end of wire
and insert wire
here.
Vapor-logic board detail
(see also Figure 5-1)
Terminal block plug.
Make connections
when the plug is
attached to the
board, or remove for
easier access. Pull
plug straight up to
remove.
INSTALLATION
P11
P12
C-1 C-221VDC
NO-1
RH
P13
DHL
24VAC AFsw
VDC
21
P14
VDC
24
TS24
P15
P16
CAsw
VAC
24
NO-2
PVsw
VAC
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
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INSTALLATION
Installation process
The Vapor-logic board is designed to make installation very easy:
• Terminal blocks that require field connections are outlined in white.
• Terminal plugs can be removed to allow easy access when inserting wires
and tightening screws.
• For most applications, humidifiers ship with the control board fully
configured, with drain, fill, and other humidifier components factory-wired
to the board, and the display attached to the humidifier and connected to
the Vapor-logic board.
SETUP OF VAPOR-LOGIC IS A THREE-STEP PROCESS:
1. Connect field wiring from device to Vapor-logic board.
See instructions beginning on Page 12. Note that some connections
listed here may not apply to your system.
• Control input (one required)
• RH or dew point transmitter
• Demand signal by others (4-20 mA or 0-10 VDC typical)
• Room or duct humidistat
• Demand signal by BACnet, Modbus, or LonTalk
• Limit controls
• Airflow switch (duct or SDU)
• Duct high limit on-off switch or transmitter
• Temperature compensation transmitter (or auxiliary temperature
sensor connected to same terminal)
• Master enable
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
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Installation process
• Communication connections
• Vapor-logic display
• Ethernet
• Modbus
• BACnet
• LonTalk
• Multiple-tank communication
• Programmable relays
• Area-type, SDU dispersion fans, or steam blowers
2. Complete the Setup process.
See instructions beginning on Page 27.
3. Start up humidifier(s).
See instructions on Page 35.
INSTALLATION
Refer to the Pre-installation Checklist and drawings on the previous pages, and
then make the field wiring connections as described on the following pages.
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
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INSTALLATION
Step 1 – Field wiring:
Control input
Connect control input signal wiring by inserting wires into Terminal P11
(labeled 21vdc, RH, and ground) per the wiring diagram on the next page.
Tighten screws.
Allowed inputs at Terminal P11 include:
• RH transmitter or dew point transmitter
Transmitters provide a signal proportional to the RH or dew point being
measured. All transmitters provided by DriSteem are two-wire devices using
a 4 to 20 mA signal.
• Demand signal by others
Demand signals are sent to the Vapor-logic board from another control
system such as a building automation system. These systems have their own
RH or dew point transmitters, calculate required humidifier output, and send
a demand signal to the humidifier to create steam at a percentage of that
humidifier’s capacity. Demand signals are typically 0-10 VDC or 4-20 mA,
but may also come from a DDC signal via Modbus, BACnet, or LonTalk.
• A humidistat also delivers a demand signal to the humidifier, but it is not
typically used with Vapor-logic.
Humidistats provide either on-off control or modulating control. DriSteem
humidistats are powered by a 24 VDC supply provided by the Vapor-logic
control board.
When using modulating control, the signal from a humidistat directly
controls the amount of output from the humidifier.
FIGURE 12-1: TERMINAL P11
Terminal P11
Terminal P11:
21vdc = Power to space RH sensor
RH = Space RH input (RH transmitter, dew point
transmitter, humidistat, or demand signal
by others (4-20 mA or 0-10) VDC input
= Ground for demand signal by others
Notes:
• See Figure 13-1.
• For more information about control input signal types and operation, see
"On-off control" on page 14.
• See "Modbus, BACnet, LonTalk interoperability" on page 66 for more
information about input signals.
Note:
If you do not know which control components
were ordered with your system, contact
DriSteem or connect your display to the Vaporlogic board per the instructions on Page 19.
Go to the instructions on Page 27 to view
system parameters that were factory configured
as ordered.
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
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Step 1 – Field wiring: Control input
FIGURE 13-1: VAPOR-LOGIC CONTROL INPUT WIRING CONNECTIONS
Signal by others
INSTALLATION
0-10 VDC
Vapor-logic
21VDC
RH
Control panel
shield GND lug
2-wire #18GA
Shield cable
Transmitter
Vapor-logic
Dew point
Control panel
shield GND lug
Note:
Input resistance on 4-20 mA is 500 ohms
P11P11
21VDC
RH
2-wire #18GA
Shield cable
RH
Y
RH
Room
or duct
4-20 mA
Vapor-logic
Input resistance
500 ohms
Control panel
shield GND lug
Vapor-logic
21VDC
RH
2-wire #18GA
Shield cable
Control panel
shield GND lug
Note: Input resistance 500 ohms
21VDC
RH
2-wire #18GA
Shield cable
21VDC
4-20 mA humidity
sensor
COM
On-o RH humidistat
% H20
Room or duct
NC contact
opens above set
point
Key
Room/Duct humidistat
P11
NC
C
GN
21VDC
RH
2-wire #18GA Shield cable (TYP)
Control panel shield GND lug
Control circuit wiring
Field wiring
Optional factory
Optional field
Break to external
connections diagram
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
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INSTALLATION
Step 1 – Field wiring: Control input signals
DriSteem offers three control options for all its humidification systems controlled
by Vapor-logic: On-off control, demand signal control, and transmitter control.
ON-OFF CONTROL
On-off control—the simplest control scheme—does exactly what its name
implies: the output device turns fully on, then fully off.
The humidistat that controls the humidifier has a differential between the on
and off switch points. The differential is established at a range sufficient to
prevent output short cycling. In other words, the humidity level has to fall below
set point before the humidistat closes and energizes the humidifier. Once the
humidifier is energized, the humidistat stays closed until the humidity is above
set point. This creates an operating range that prevents the humidifier from
running for very short periods of time.
In applications with a variable output stage, such as a GTS humidifier, the
outputs are ramped up until they reach 100%.
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Step 1 – Field wiring: Control input signals
INSTALLATION
MODULATING DEMAND SIGNAL CONTROL
With modulating demand signal control, a modulating humidistat
or a building automation system sends a signal to the Vapor-logic
controller, which then sends a signal to the humidifier to produce
a directly proportional steam output. For example, if a humidistat
operating between 4 mA and 20 mA sends a 4 mA signal,
the humidifier produces no output; a 12 mA signal causes the
humidifier to run at 50% of capacity; and a 20 mA signal causes
the humidifier to run at 100% capacity.
With a humidistat provided by DriSteem producing this signal, the
humidity set point is set at the humidistat. The display then is used
for maintaining and troubleshooting the humidification system,
with humidifier control stemming from the humidistat itself. With a
building automation system (BAS) providing the signal, the humidity
set point is established by the BAS, and the humidifier responds to
the BAS commands.
TRANSMITTER CONTROL
With transmitter control, the Vapor-logic board receives a signal
that corresponds to the actual humidity level measured in the space
being controlled. (With a transmitter provided by DriSteem, the
signal is 4 to 20 mA, which corresponds to 0 to 100% RH). The
Vapor-logic controller employs an internal PID loop that uses this
humidity measurement along with a user-defined humidity set point
to calculate a demand level. This demand level is the level at which
the humidifier will run. See “PID tuning” on Page 49.
Calculation of transmitter % RH
% RH =
Example: 12 mA – 4 mA
(mA reading) – 4 mA
16 mA
x 100% = 50% RH
16 mA
x 100%
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INSTALLATION
Step 1 – Field wiring: Limit controls
Connect wiring for a duct airflow proving switch or Space Distribution Unit
(SDU) airflow proving switch by inserting wires into the terminal block plug
at P13 (labeled AFsw and 24vac) per the wiring diagram on the next page.
Tighten screws; maximum torque is 3 in-lb (0.34 N-m). (An SDU is a cabinet
fan dispersion assembly.)
See also “Sensor placement” on Page 26.
DUCT HIGH LIMIT SWITCH OR TRANSMITTER
Connect wiring for a duct high limit switch or transmitter by inserting wires
into the terminal block plug at P13 (labeled DHL and 21vdc) per the wiring
diagram on the next page. Tighten screws.
Note: The duct high limit sensor connected at this location can be an on-off
high limit switch, or it can be a duct high limit transmitter with an adjustable
high limit set point (4-20 mA input).
See also “Sensor placement” on Page 26.
MASTER ENABLE INPUT
Connect wiring for an enable/disable dry-contact signal by inserting wires into
the terminal block plug at P20 (labeled MASTER ENB). Tighten screws. Remove
shunt on J402 if wiring is installed.
FIGURE 16-1: TERMINAL P13AIRFLOW PROVING SWITCH
Terminal P13
J402
Terminal P20
Terminal P13:
21vdc = Power to duct high limit switch or
transmitter
DHL = Duct high limit switch/transm. (4-20 mA
input)
24vac = Power to airflow proving switch
AFsw = Airflow proving switch (24 VAC input)
If an enable signal is not being used, jumper the MASTER ENB terminal block
plug at P20 or attach the included shunt to the two pin header at J402.
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
Note:
Field wiring required between SDU cabinet terminal
strip for SDU blower and air flow switch
Duct air flow
switch (N.O.)
Duct air flow
switch is in
SDU cabinet
P13
24VAC
Duct high limit (not used on SDU or Area-type)
TransmitterOn/off
NC
C
GN
NC contact
opens above
set point
Vapor-logic
P13
21VDC
DHL
2-wire #18GA
shield cable (TYP)
Control panel
shield GND lug
V
RH
Vapor-logic
P13
21VDC
21 VDC
DHL
4-20 mA
High limit sensor
Duct mount
2-wire #18GA
shield cable (TYP)
Control panel
shield GND lug
Duct air flow switch is not
used on Area-type
Modulating high limit
humidification application. If no airflow switch
is used, install shunt at P13 (24VAC to AFSW).
INSTALLATION
Temperature compensation transmitter or auxiliary temperature sensor
Temp comp transmitter
Vapor-logic
P14
21VDC
RD
WH
Control panel
Key
Control circuit wiring
Field wiring
Optional factory
TS
2-wire #18GA
shield cable (TYP)
Optional field
Break to external
connections diagram
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
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Page 22
INSTALLATION
Step 1 – Field wiring: Limit controls
Connect wiring for a temperature compensation transmitter or an auxiliary
temperature sensor by inserting wires into the terminal block plug at P14
(labeled 21vdc and TS) per the wiring diagram on the previous page. Tighten
screws; maximum torque is 3 in-lb (0.34 N-m).
Note: Only one device can be connected at P14. You will identify the
connected device in “Step 2 – Setup,” beginning on Page 27.
AUXILIARY TEMPERATURE SENSOR
An auxiliary temperature sensor typically monitors duct or space air
temperature. Mount the auxiliary temperature sensor wherever you want to
monitor temperature. Auxiliary temperature readings are logged to the data
log.
TEMPERATURE COMPENSATION TRANSMITTER
A temperature compensation transmitter allows Vapor-logic to reduce humidifier
output on cold days, reducing window condensation. Mount the temperature
compensation transmitter on the inside of an outside-wall window.
To mount the temperature compensation sensor:
1. See Figure 18-2. Position the temperature compensation sensor control box
on a wall adjacent to a window frame facing north or northeast.
2. Place the flat surface of the temperature sensor tip on the lower corner of
glass surface.
3. Temporarily hold the sensor tip in place with strips of masking tape.
4. Apply a small amount of clear RTV silicone adhesive over and around the
sensor tip (making sure the sensor tip is in contact with the window glass).
5. After adhesive cures, remove masking tape.
6. See the operation section of this manual for more information about the
temperature compensation sensor.
FIGURE 18-1: TERMINAL P14
Terminal P14
Terminal P14:
21vdc = Power to auxiliary temperature sensor
or temperature compensation sensor
(transmitter)
TS = Auxiliary temperature sensor or
temperature compensation sensor
(transmitter) (4-20 mA input)
FIGURE 18-2:
TEMPERATURE COMPENSATION
TRANSMITTER INSTALLATION
Window frame
Thermostat
control wires
Surfacemounted
thermostat
temperature
control box
on wall
Typical
sensor
cord
routing
Secure temperature
sensor tip to inside
surface of window
glass using clear RTV
silicone adhesive
Doublepane
window
glass
OM-337
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
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Page 23
Step 1 – Field wiring: Communication connections
INSTALLATION
VAPOR-LOGIC DISPLAY
If your display is factory-mounted and connected to the Vapor-logic board,
proceed to installing the next device required by your system.
If your display was shipped loose, mount the display in a location so that the
provided cable is long enough to connect the display to the Vapor-logic board.
To connect a Vapor-logic display to the Vapor-logic board, insert one end of the
provided cable into the Vapor-logic board at Terminal P10 (labeled Display)
until you hear a click sound (see also the wiring diagram on the next page).
Plug the other end of the cable into the display. This connection provides DC
power and communication to the display.
See Caution at right before routing cable.
If a longer display cable is needed, order a replacement cable from DriSteem
(see the replacement parts section of this manual), or use a four-conductor
straight-through cable or a six-conductor, crossover, twisted pair cable
connected to an RJ11 jack.
Note required operating conditions listed on Page 3.
FIGURE 19-2: MOUNT THE TOUCHSCREEN DISPLAY ON A WALL
USING THE WALL PLATE
FIGURE 19-1: TERMINAL P10
Terminal P10:
Display
CAUTION
Touchscreen display cable
Maximum cable length is 500’ (152 m).
When routing display cable, route
cable away from all power wiring.
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
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Page 24
INSTALLATION
Step 1 – Field wiring: Communication connections
FIGURE 20-1: VAPOR-LOGIC COMMUNICATION WIRING CONNECTIONS
PC or BACnet IP
Ethernet connection
RJ11 cable
Vapor-logic
touchscreen
display
J1001: Install jumper if multi-tank
system and controller is at end of
communications link
Previous BACnet
MSTP or Modbus
device
Next BACnet MSTP or Modbus device
Previous LonTalk device
Twisted pairTwisted pair
Previous multitank humidifier
Protocessor module (optional)
A
B
LonTalk terminals
Next multitank humidifier
Twisted pair
Next LonTalk device
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
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Step 1 – Field wiring: Communication connections
INSTALLATION
WEB INTERFACE COMMUNICATION
Utilizing the Vapor-logic Web interface is optional. The humidifier can be
operated using the touchscreen display and/or the Web interface. When
using the Web interface, the humidifier can be accessed by a computer either
directly or through a network. Each Vapor-logic controller ships with the static
IP address of 192.168.1.195. This allows users to locate the Web interface
upon start-up. After initial start-up, the IP address can remain as is, be reassigned as another static address, or configured to Auto Obtain Address,
and find an IP address on the network using DHCP. See the steps below for
information about connecting to the humidifier using the Web interface.
CONNECTING WEB INTERFACE DIRECTLY TO A COMPUTER NOT ON A NETWORK
1. Connect the Ethernet cable.
Insert one end of an RJ45 Ethernet cable into the Vapor-logic board at
P9 (labeled Ethernet; see Figure 21-1) until you hear a click sound. Insert
the other end of the cable into a computer. Since the Ethernet port on the
Vapor-logic board is auto-sensing, either a straight-through or crossover
cable will work.
2. Check the current IP address of your computer.
Connecting a computer to the humidifier requires that the computer being
used has the same network address range as Vapor-logic. In order to
validate this, check the IP address of the computer being used by going to
the computer’s Start menu and pull up a search window. In the search box
type cmd.
FIGURE 21-1: TERMINAL P9
Terminal P9:
Ethernet
FIGURE 21-2:
CHECKING YOUR IP ADDRESS
Vapor-logic default IP address
192.168.1.195
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INSTALLATION
Step 1 – Field wiring: Communication connections
After a system prompt appears, type in ipconfig and then hit Enter. The current
IP address for the Ethernet adapter Local Area Connection should appear. If the
first three segments of that IP address are different than the first three segments
of the humidifier’s default IP (192.168.1.xxx), you must change either your
computer or Vapor-logic’s IP address such that they match each other.
FIGURE 22-1: CHECKING YOUR IP ADDRESS
3. Change the IP address of your humidifier or computer if necessary.
a. Change the IP address of the humidifier to work with your computer.
The most straightforward way to change the IP address of the humidifier
using Vapor-logic is to use the touchscreen display. Go to Settings/
Communications/IP Addressing on the touchscreen display and change
the IP address such that the first three segments of the first three segments
of the humidifiers address match. Make sure the last digit of the IP
address is different between the humidifier and the computer. Cycle
power of Vapor-logic board for address change to take effect.
b. Change the IP address of your computer to match the humidifier.
Changing the IP address of the computer being used will likely require
administrative privileges for your company’s network. Please consult your
IT department for this task.
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Step 1 – Field wiring: Communication connections
INSTALLATION
4. Connect to the humidifier.
a. Using a computer connected to the Vapor-logic board, open a Web
browser such as Mozilla® Firefox® or Internet Explorer®.
b. Find the browser address bar (see Figure 23-1), delete all existing text in
the browser address bar, type the Vapor-logic IP address into the browser’s
address bar, and press Enter.
Note: The Vapor-logic default IP address is 192.168.1.195
CONNECTING WEB INTERFACE TO AN ETHERNET NETWORK
See Caution at right before proceeding.
If your network uses DHCP (Dynamic Host Configuration Protocol), use the
touchscreen display to navigate to:
Settings/Communications/IP Addressing. Select "Auto Obtain Address" and
restart the Vapor-logic board.
The most current IP address can always be found by using the touchscreen
display to navigate to:
Settings/Communications/IP Addressing.
Important: DHCP cannot be enabled from the Web interface; it must be
enabled using the touchscreen display.
OTHER COMMUNICATION CONNECTIONS
For BACnet or LonTalk installation instructions, see Page 66.
For multiple-tank installation instructions, see Page 74.
FIGURE 23-1: ENTERING THE IP ADDRESS
Enter the IP address in your browser’s address bar
CAUTION
Vapor-logic IP address
Before you connect a Vapor-logic
device to a network, please contact
your IT department. Given that the
Vapor-logic controller ships with a
static IP address, it is important to
ensure that there is not another device
with that same IP address already
on the network. Work with your IT
department before network connection
will help ensure the integrity of the
network and the devices on that
network
DHCP and IP address
When DHCP is enabled, the server
can dynamically change the IP
address of Vapor-logic, making
existing bookmarks unusable.
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INSTALLATION
Step 1 –
PROGRAMMABLE RELAYS (DRY CONTACT)
Field wiring
See “Programmable relay maximum current” in Caution below.
See Figure 25-1. Connect wiring for remote signaling using a
programmable relay (dry contact) by inserting wires into the terminal block
plug at P12 or P16, per the wiring diagram in Figure 25-1. Tighten screws.
This connection allows remote activation of devices such as fans or signal
lights. Output parameters are defined during Step 2 of the installation process.
CAUTION
Programmable relay maximum current
Programmable relay (dry contact) (P12) is rated for 125 VAC, 3 AMP or 30 VDC, 3
AMP maximum. Exceeding this maximum rating can cause the relay component or
the Vapor-logic board to fail.
FIGURE 24-1: TERMINAL P12 AND P16
Terminal
P16
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
24
Terminal
P12
Terminal P16:
NO-2 = Relay 2, normally open
PV/CA = Power vent/combustion air control
signal (24 vac output)
SDU = Space Distribution Unit (24 vac output)
Terminal P12:
Programmable relay (dry contact)
NO-1 = Relay 1, normally open
C-1 = Common 1
C-2 = Common 2
Contacts rated 125
VAC/3 AMP or 30
VDC/3 AMP, optional
by others
P12
Normally open #2
Common #2
P16
INSTALLATION
Terminal
P15
Key
Control circuit wiring
Field wiring
Optional factory
AREA-TYPE AND SDU DISPERSION FANS
Optional field
Break to external
connections diagram
Connect wiring for Area-type and Space Distribution Unit (SDU) dispersion fans
by inserting the wire into the terminal block plug at P16 (labeled SDU). Tighten
screws.
OPTIONAL COMBUSTION AIR SWITCH AND POWER VENT
Connect wiring for GTS combustion air switch and/or GTS power vent by
inserting wires into the terminal block plugs at P15 and P16. Tighten screws.
Remove shunt on J403 (combustion air) or J404 (power vent) if it is installed.
The combustion air switch is on the combustion air damper. The power vent
switch indicates airflow at the power venter.
Terminal P15:
24vac = Power to combustion air switch
CAsw = Combust. air sw. (24vac input)
24vac = Power to power vent switch
PVsw = Power vent switch (24vac input)
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
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INSTALLATION
Step 1 – Field wiring: Sensor placement
HUMIDISTAT AND SENSOR LOCATIONS ARE CRITICAL
Humidistat and sensor location have a significant impact on humidifier
performance. In most cases, do not interchange duct and room humidity
devices. Room humidity devices are calibrated with zero or little airflow;
whereas duct humidity devices require air passing across them.
Recommended sensor locations (see Figure 26):
A Ideal. Ensures the best uniform mix of dry and moist air with stable
temperature control.
B Acceptable, but room environment may affect controllability, such as when
sensor is too close to air grilles, registers, or heat radiation from room
lighting.
C Acceptable. Provides uniform mixture of dry and moist air. If extended time
lag exists between moisture generation and sensing, extend sampling time.
D Acceptable (behind wall or partition) for sampling entire room if sensor is
near an air exhaust return outlet. Typical placement for sampling a critical
area.
E Not acceptable. These locations may not represent actual overall conditions
in the space.
F Not acceptable. Do not place sensors near windows, door passageways,
or areas of stagnant airflow.
Other factors affecting humidity control
Humidity control involves more than the
controller’s ability to control the system. Other
factors that play an important role in overall
system control are:
• Size of humidification system relative to
load
• Overall system dynamics associated with
moisture migration time lags
• Accuracy of humidistats and humidity
transmitters and their location
• Dry bulb temperature accuracy in space
or duct
• Velocities and airflow patterns in ducts
and space environments
• Electrical noise or interference
G Best sensing location for a high-limit humidistat or humidity transmitter and
airflow proving switch.
FIGURE 26-1: RECOMMENDED SENSOR LOCATION
High limit humidistat or high limit transmitter
(set at 90% RH maximum) for VAV applications
Airflow switch or differential pressure switch
(sail type recommended for VAV applications)
Vapor absorption has taken place
Point of vapor absorption
Steam dispersion assembly
Turning vanes
Outside air
Relief air
Damper control
Return air
E
A
F
C
Window
Air handling
unit
D
B
E
WindowDoorway
8' to 12'
(2.4 m to 3.7 m)
min.
G
F
F
DC-1084
Temperature compensation option: Place a temperature compensation sensor on the
lower corner of the inside surface of double-pane window glass on north- or northeastfacing window.
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
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Step 2 – Setup
INSTALLATION
To simplify the field-installation process, humidifiers are sent from the factory
configured as ordered. However, some settings are unknown at the factory
and need to be defined during the setup process using the Settings menu. The
Settings menu is also where you make future system setting changes.
To begin the field setup process, go to the Settings menu on either the
touchscreen display or Setup on the Web interface. Settings menu parameters
are listed in Table 29-1. Options and defaults are the same whether viewed
from the touchscreen display or Web interface. However, labels may be
different on the Web interface.
USING THE TOUCHSCREEN DISPLAY
To access the Settings on the touchscreen display, press the gear icon labeled
Settings.
After entering the settings menu, touch a title bar to choose a category. Use
the Help icon in the lower right corner to get a description of all the Settings
categories.
FIGURE 27-1: USING THE VAPOR-LOGIC TOUCHSCREEN DISPLAY
Typical Home screen
FIGURE 27-2: SETTINGS
FIGURE 27-3: SETTINGS HELP
Press the Settings gear
icon to access a list of
all changeable system
parameters.
Press the Help
question mark for a
complete description
of everything on a
screen.
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INSTALLATION
Step 2 – Setup
USING THE WEB INTERFACE
Although not required for humidifier operation, the Web interface allows
convenient and remote access to Vapor-logic.
See Page 21 for Web interface connection and IP address instructions.
Follow the instructions below to complete the setup process.
FIGURE 28-1: USING THE VAPOR-LOGIC WEB INTERFACE ( SHOWN)
Click on a tab label to move to another screen
Click here
to view
alarms
SETUP SCREEN
Click on
CHANGE to
change value
Click here to
view messages
Click on label
to contract (–)
or expand (+)
menu item
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Step 2 – Setup
Table 30-1:
Settings menu
INSTALLATION
Menu itemDefault value
Control
Control Input Signal--------
Control Input Signal (type)--------Type chosen must match hard wired input
RH Transmitter--------4-20mA room or duct sensor
RH Setpoint350100%
RH Offset0-2020%
PID tuning--------
PID band10050%
Proportional gain8001000--
Integral gain4001000--
Derivative gain001000--
VDC Demand--------
VDC Settings--------
0% output (VDC)1.00.0MaximumVDC
100% output (VDC)9.0Minimum 16.0VDC
mA Demand--------Current signal by others
mA Settings--------
0% output (mA)4.00.0MaximummA
100% output (mA)20.0Minimum20.0mA
Fieldbus--------
(See Communications settings)--------
Humidistat--------On-off humidistat
Duct RH Limit
Limit TypeSwitch------
Switch--------Humidistat (switch) installed in duct
Transmitter--------Humidity sensor installed in duct
High Limit Settings--------
Duct HL Setpoint80595%
Duct HL Span6020%
Duct HL Offset0-2020%
Not Used--------
Minimum
value
Maximum valueUnitsNotes
DriSteem recommends using default values
for offsets and PID settings when first setting
up your humidifer.
Voltage signal by others or modulating
humidistat
BACnet, LonTalk or Modbus communicated
signal by others
Span (throttle span) is a threshold below
the high limit setpoint where the humidifer
reduces output but does not turn off until the
device high limit set point is reached.
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INSTALLATION
Step 2 – Setup
Table 30-1:
Settings menu (continued)
Menu itemDefault value
Fan Dispersion
Fan Type--------
Space Distribution
Unit
Fan Off Delay5130Minutes
Area-Type Fan--------
Auxiliary Temperature Sensor
PurposeNot Used------
Temperature
Compensation
Sensor Offset
Temperature
Monitoring
Sensor Offset
Not Used--------
Programmable Outputs
Dry Contact 1 or 2--------
Contact Behavior
Contact PurposeDefault Alerts------
Default Alerts
View Default
Alerts
Selected Alerts
Alert selection
Alert on Low RH--------
Alert below RH500100--
Steam Yes/No--------
Heat On/Off--------A dry contact activates when the humidifier is heating.
Not Used--------
--------
--------
0-2020°F
0-1111°C
--------
0-2020°F
0-1111°C
Normally
open
--------
--------
Minimum
value
Normally
open
Maximum
value
Normally
closed
UnitsNotes
CAUTION
Programmable dry contact maximum current
Programmable dry contact (P12 or P16) is rated for 125 VAC,
3 AMP or 30 VDC, 3 AMP maximum. Exceeding this maximum
rating can cause the dry contact (relay) component or the Vaporlogic board to fail.
--Contact action on event
A dry contact activates whenever there is an alert,
which does not auto-clear.
A dry contact activates whenever there are alerts selected from
the alert selection list.
Contact toggles whenever the space humidity falls below the low
RH setting. Adjust the contact behavior to either open or close
when the space RH gets low. To use this feature the control input
signal type must be an RH transmitter.
A dry contact activates when the tank temperature reaches
boiling
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Step 2 – Setup
Table 30-1:
Settings menu (continued)
Menu itemDefault value
Water Management
Automatic Drain Sequence--------
Drain Interval Choice
Draining Disabled--------
Smart Drain--------
Static Drain--------
Allowed Drain Times--------
Restrict Hour to DrainYes------
Hour to Drain0 (12 AM)023Hours
Allowed DaysAll------
SundayYes------
MondayYe s------
TuesdayYes------
WednesdayYes------
ThursdayYes------
FridayYes------
SaturdayYes------
Static Drain SettingsModel-specific
Drain DurationModel-specific0120Minutes
Flush Duration Model-specific015Minutes
Skim--------
Skim FeatureEnabled------
Skim DurationModel-specific0120Seconds
End of Season--------
End of Season Drain Enabled------
Idle Time Before Drain721336Hours
Smart
Drain
Minimum
value
------
02,200,000lbs
01,000,000kg
Maximum
value
UnitsNotes
INSTALLATION
When enabled, the humidifier automatically drains and
then flushes the tank at user-defined (Static) or automatic
(Smart) intervals.
Vapor-logic automatically adjusts the drain usage
interval based on calculated water quality.
Humidifier automatically drains and then flushes the tank
at user-defined intervals.
Select time of day (24 hour clock) auto drain/flush starts
once usage requirement is met
Select days of week auto drain/flush is allowed once
usage requirement is met.
Select amount of water to be converted to steam before
auto drain/flush starts.
Select number of minutes for drain valve to remain open
during auto drain/flush. Default value is based on tank
and valve size.
Select number of minutes for fill valve to remain open
during flushing.
Water allowed to overflow to remove minerals from
tank.
If enabled, the humidifier tank drains after the humidifier
has been idle for a user-defined time.
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INSTALLATION
Step 2 – Setup
Table 30-1:
Settings menu (continued)
Menu itemDefault value
Aquastat--------
Aquastat FeatureEnabled------
Aquastat Setpoint
Service Interval--------
Service IntervalModel-specific02,200,000lbs
Service IntervalModel-specific--1,000,000kg
Fill Fault Time-Out--------
Fill Fault Time-Out4010250MinutesAmount of fill time before an alert will occur.
Drain Tempering --------
Drain Tempering FeatureEnabledDisabledEnabled--
Drain Valve
Test
Test Outputs--------
Fill Valve555Seconds
Pulse Fill Valve(s)555Seconds
Drain Valve101010Seconds
Fan Control555Seconds
Ignition Module 1 or 2888Seconds
Blower Speed Control101010Seconds
Dry Contact 1 or 2555Seconds
Test Run--------
Test Run Percent1000100%
Test Run Time5130Minutes
Start/Stop Test Run--StartStop--
Communications
IP Addressing--------
IP Address192.168.1.1950.0.0.0255.255.255.255--
IP Mask255.255.255.00.0.0.0255.255.255.255--
Gateway192.168.1.10.0.0.0255.255.255.255--
Auto Obtain AddressNo------
5040180°F
10482°C
Normally
Closed
Minimum
value
Normally
Closed
Maximum valueUnitsNotes
The minimum aquastat setting prevents tank water
freezing. Higher settings keep tank water warm,
reducing time required to bring water to boiling
after a call for humidity.
Select amount of water to be converted to steam
or hours that humidifier runs before service
interval is reached.
Enable drain tempering to keep drain water below
140°F (60°C)
Normally
Open
Changing drain valve action requires changing
--
the drain valve. Not all options available for all
models.
Choose “Start” to turn on the output for a few
seconds. Choose “Back” if you do not want to
test the output at this time. Once the test starts it
cannot be cancelled. After the test the mode will
change to Standby.
Simulate a demand for steam production when
there isn’t one so that the humidifier can produce
steam for a specific amount of time. Humidifier
will return to Standby mode.
Automatically obtain an IP address from a network
server or assign a static IP address
Use the touchscreen display to access this menu
item. This item is not available when using the
Web interface.
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Step 2 – Setup
Table 30-1:
Settings menu (continued)
Menu itemDefault value
Communication TypeModbus------
BACnet MS/TP--------
Comm Channel384001920076800--
BACnet MS/TP
Settings
Device Instance25504194303--
Max Masters1271127--
MAC Address10127--
Max Info Frames11127--
BACnet IP--------
Device Instance25504194303--
UDP port (47808)47808102465535--
Modbus--------
Modbus Baud Rate19200480038400--
--------
Minimum
value
Maximum valueUnitsNotes
INSTALLATION
Modbus Address990255--
LonTalk--------
Display
Date and Time--------
Set Date1999------
Set Time0:000:0023:59--24 hour clock
Humidifier Info--------
Press the edit icon to edit the name of the
Unit Nameorder-specific120Characters
Modelorder-specific------Displays humidifier model
Serial Numberorder-specific------Displays humidifier serial number
Reset Ignition Counts--------Select this if you want to reset the GTS ignitor counts
Minimum
value
Maximum valueUnitsNotes
Select number of minutes the touchscreen display
remains idle before returning to the Home screen.
Touch input will be disabled for 30 seconds so the
user can wipe it with a soft cloth.
Changing the capacity calibration setting changes
reported, not actual, humidifier output
Enter four digits, numbers only, and define the timeout period (minutes of inactivity before Vapor-logic
reverts to read-only mode).
The default passcode is 0000.
Humidifier settings can be backed up to or restored
from a USB flash drive
CAUTION
These actions cannot be reversed.
Select this if you want to reset all humidifier settings
to factory defaults
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Step 3 – Startup
STARTING UP THE HUMIDIFIER
The touchscreen will guide you through common setup procedures with an onscreen wizard the first time the humidifier powers up.
1. Press Initial Setup to begin. For step one, verify that all installation and
startup checklist items in this manual and in the humidifier's Installation,
Operation, and Maintenance manual have been completed.
2. Use the next button to set the date, time and custom humidifier name.
3. Address any alerts that might prevent humidifier operation and press next.
4. Close the wizard by choosing the Home icon and then put the humidifier
in Auto mode to start it up.
FIGURE 35-1: START-UP
INSTALLATION
Line up the camera on your
device with the QR code you
want to scan, and hold the
device steady until the app can
read the code in front of it.
The QR code will bring you to
the downloadable Installation
and Operation Manual on
dristeem.com.
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OPERATION
Using menus and screens
VAPOR-LOGIC DISPLAY HAS THE FOLLOWING MENUS AND SCREENS:
• Home screen
• Submenus:
• Status
• Help
• Alerts
• Settings
The items on the Web interface Diagnostics screen have been moved on
the touchscreen. Go to Settings to access test functions, see humidifier
configuration info and do a settings backup. Go to Status to Download Data.
Use the Alerts icon to view messages.
Vapor-logic Web interface has the following screens:
• Status
• Diagnostics
• Alarms
• Setup
• Help
FIGURE 36-2: USING THE VAPOR-LOGIC WEB INTERFACE (STATUS SCREEN SHOWN)
FIGURE 36-1:
TOUCHSCREEN DISPLAY HOME SCREEN
Click here
to view
alarms
Click here
to view
messages
Click on a tab label to move to another screen
Click on CHANGE
to change value.
Note that most
system parameters
are changed in the
Settings menu.
Drag scroll bar
to view more
of the window
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Home screen (touchscreen display)
OPERATION
Vapor-logic returns to the Home screen on the touchscreen display after a userdefined period of idleness. The Home screen displays the items most frequently
viewed: Actual space RH or dew point, RH or dew point set point, tank/system
output or steam demand, humidifier mode, and tank activities such as starting
up, humidifying, heating, and auto drain.
There is a tank level indicator on the left side of the screen. See the table below
for a description of tank level indicators.
To the left of the tank level indicator is a tank temperature display showing
actual tank temperature.
CHANGING MODE AND SET POINT
Mode and Setpoint can be changed from the Home screen. Use the edit icons
to the right of the value to change the Mode or Setpoint. All other parameters
shown on the Home screen are for viewing only and cannot be changed. Go
to the Settings menu to change these items.
TANK ACTIVITIES DEFINED
• Disabled: Mode is Standby, waiting for user to change the mode to Auto.
• Probe check: The Vapor-logic control is verifying water probe operation and
checking water quality.
• Starting up: The Vapor-logic controller is turning on the heating source.
FIGURE 37-1: WATER LEVEL CONTROL
Top probe
VLC-OM-030
Tank-level icons indicate water level at the
water level control probe. See “Water level
control” on Page 53.
FIGURE 37-3: FILL ICON
Empty: Water is
below low probe.
Mid probe
Low probe
• Heating: The heating source is ON, but water is not yet boiling.
• Humidifying: There is a demand for humidity and water in tank is boiling;
humidifier has output.
• Filling: Fill valve remains open until water reaches operating level.
• Skimming: Fill valve is open to allow water to flow through the overflow port,
skimming off precipitated minerals.
• Flushing: Fill and drain valve are open to flush tank.
• Idle: Humidifier is waiting for demand.
• Auto Drain: Humidifier is doing a periodic drain to get excess minerals out
of the tank.
• Tempering: Fill valve is open during a drain to decrease drain water
temperature.
• Draining: User has changed the mode to Drain.
• Stopped: There is an active Red Alert, indicating a fault condition or the
humidifier is in Standby mode.
• End of Season Drain: Tank is draining because there has been no demand
for a user-definable time period.
• Foam Drain: Humidifier is doing an immediate drain to get foam out of the
tank.
Two thirds full: Water
is between mid and
top probes.
Full: Water is above
the mid probe.
• Keep Cool: Fill and drain cycles operate to cool an overheated humidifier.
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OPERATION
Status screen
Using either the touchscreen display or the Web interface, the Status screen is where all humidifier parameters can be
viewed. On the touchscreen only Quick Diagnosis provides a way to view if all requirements for safe operation have
been met. It reports why a humidifier is not making steam. Access Quick Diagnosis from the Status menu or from the
status bar, tank icon, or output icon on the Home screen.
See the tables on the following pages for Status screen item descriptions for both the touchscreen display and Web
interface. On the touchscreen use the Help icon to get a description of status items.
FIGURE 38-1: WEB INTERFACE STATUS SCREEN
Drag scroll bar
to view more of
the window
FIGURE 38-2: STATUSFIGURE 38-3: QUICK DIAGNOSIS
FIGURE 38-4: COMPLETE STATUS
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Status screen
Table 39-1:
Status screen
Note: Your system might not have all of the items listed in this table (Pages 39 and 42).
Menu itemDefault value
ModeStandby------
Space RH--0100%
RH set point350100%
--010VDC
Input signal
--020mA
--0100°F
Dew point
---1737°C
502080°F
Dew point set point
10-626°C
Inlet pressure switch--No waterWater--
Steam demand--0100%Displays steam demand as a percent of capacity
Steam output--0100%Displays steam output as a percent of capacity
--0100,000lbs/hr
Steam production
--0100,000kg/h
Duct RH--0100%
Duct HL switch--OpenClosed--
Duct HL set point80595%
Duct HL signal--020mA
---30275°F
Tank temperature
---34135°C
Tank temp signal--02200Ohms
---20160°F
Aux temperature
---2971°C
Aux temp signal--026mA
Minimum
value
Maximum
value
UnitsNotes
Operating mode of humidifier. Choose from Auto, Standby, or Drain.
• In Auto mode, the humidifier operates normally. All humidifier
components are monitored and controlled. If there is a call for
humidification, the system reacts.
• In Standby mode, the humidifier is offline. All humidity control inputs
appear but are not acted upon; however, if the tank temperature falls
below the freeze protect set point, the drain valve opens.
• In Drain mode, the automatic drain valve (if so equipped) opens and
the tank drains. All humidifier operation is suspended, and the drain
valve remains open until the unit is taken out of Drain tank mode.
• See the Diagnostics section for information about Test outputs and Test
run modes.
OPERATION
Continued
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
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OPERATION
Status screen
Table 41-1:
Status screen (continued)
Menu itemDefault value
Board voltage24030VAC
Board temp--0200°F
High probe signal--014000counts
High water probe--WaterNo water--
Mid probe signal--014000counts
Mid water probe--WaterNo water--
Low probe signal--014000counts
Low water probe--WaterNo water--
Airflow switch--FlowNo flow--
Interlock switch--OpenClosed--
Water until
drain/flush
Water until service
Blower 1 tach--07000rpmDisplays rotation speed of Blower 1
Blower 2 tach--07000rpmDisplays rotation speed of Blower 2
Gas valve 1--OpenClosed--
Gas valve 2--OpenClosed--
----2,200,000lbs
----1,000,000kg
----2,200,000lbs
----1,000,000kg
Minimum
value
Maximum
value
UnitsNotes
Displays amount of water to be converted to steam before
automatic drain sequence (ADS) can begin
Displays amount of water to be converted to steam before next
recommended maintenance service
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Status screen
Table 41-1:
Status screen (continued)
Menu itemDefault value
Combust air switch--FlowNo Flow--
Power vent switch--OpenClosed--
Flue pressure switch--OpenClosed--
Flue temperature
Drain temperature
Temperature switches--OpenClosed--For flue and tank temperature
--32212°F
--0100°C
--32212°F
Minimum
value
0100 °C
Maximum
value
UnitsNotes
OPERATION
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OPERATION
System alerts
FIGURE 42-1: TOUCHSCREEN
The active Alerts menu displays active system alarms and messages as Red,
Yellow and White alerts. Using the touchscreen, go to the Alerts menu by
pressing the Alerts icon, or by pressing the Home icon and then the Alerts
icon. The Alerts menu displays the alert name, date and time of occurrence
and the word Clear. To get troubleshooting information about the alert
touch the name of the alert on the alert bar. Touch the word Clear to request
Vapor-logic to manually clear the alert when you are sure that the condition
that caused the alert has abated. When the alert status changes to cleared,
the alert will move from the active Alerts menu to the Alert Log. Using the
Web interface, click on the View Alarms link in the upper left corner of any
screen to show all alerts, both active and historical.
The Alerts Log displays the alerts name, date and time of occurrence, plus
whether the alarm is active, has been cleared by an operator, or autocleared by Vapor-logic. The Alerts Log lists active alerts at the top of the list,
followed by cleared alerts in chronological order. The Alerts Log holds 60
alerts. As alerts are cleared, they move down the list below active alerts.
When the Alarms list reaches 60 alerts, new alerts add to the top of the list
and the oldest, cleared alerts leave the list. Alert information is retained in
nonvolatile memory if the Vapor-logic board loses power.
The color of an alert indicates severity. In the active Alerts screen the alerts
are ordered Red, Yellow, White. The alert icon will be the color of the
highest level of active alert.
• Red: faults requiring immediate attention
• Yellow: environmental conditions preventing unit operation
• White: diagnostic or service messages; events that will or have occurred
that do not prevent unit operation
See Table 44-1 for alarms and their descriptions.
Alert causes and recommended actions are listed in the troubleshooting
section in this manual.
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System alerts
FIGURE 43-1: VAPOR-LOGIC WEB INTERFACE ALARMS SCREEN
OPERATION
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OPERATION
System alerts
Table 44-1:
Alerts menu
Alert labelDescription
Red Alerts
Tank temp sensor failedTank temp sensor has failed.No
Fault occurs at boiling temperature plus 25 °F (13 °C). All units are put into a keep cool state where
Tank overtemp
Space RH signal out of range RH signal is out of range.Yes
fill and drain cycles operate to keep tank cool. First resolve any safety issues, then resolve whatever is
causing the problem. Restart the controller to clear the alarm.
Does alert
auto-clear?
No
Dew point signal out of
range
Demand signal out of range Demand signal is out of range.Yes
Duct RH signal out of range Duct RH signal is out of range. Sensor may be faulty.Yes
Aux temp sense out of range Auxiliary temp sensor signal is out of range.Yes
Check water probeWater probe head is dirty, faulty, or miswired.Yes
Faulty water probeWater probe readings are suspect, likely caused by scale on probe.No
Excess fill timeFill valve has been on too long during initial tank fill. Bottom probe is not in contact with water.Ye s
Excess refill timeRe-filling is taking too long. Top probe is not in contact with water.Yes
Tank not draining
Excessive boil time
No SDU airflow
Overtemp cutout
Blocked flue Flue pressure switch indicates positive pressure in flue. Burner will not ignite when this fault is active. Ye s
Burner 1 or 2 fault
Ignition mod. 1 or 2 fault
Blower 1 or 2 faultBlower is turning at less than the specified minimum RPM. Unit not allowed to run. Yes
Gas valve 1 or 2 faultGas valve is on when it should be off. Unit not allowed to run.Yes
Dew point signal is out of range.Yes
Drain valve has been open for the prescribed amount of time based on the humidifier model, and water is
still touching the low water probe.
Humidifier continues to add water when there is no demand, signifying humidifier is continuing to make
steam. Humidifier is put into a keep-cool state where fill and drain cycles operate to keep tank water from
boiling. First resolve any safety issues, then resolve whatever is causing the problem. Restart the controller,
and clear the alarm.
Airflow proving switch in the SDU (space distribution unit, a fan-based dispersion assembly) indicates no
airflow. No steam is produced while alarm is active.
Overtemp cutout circuit has opened. First resolve any safety issues, then resolve whatever is causing the
problem. Restart the controller to clear the alarm.
Burner tried one or more times to light and did not succeed. Once this fault is active, Vapor-logic locks out
the burner and does not try to light it again until fault is cleared. Other burners can run.
Ignition module has not opened the gas valve. Once this fault is active, Vapor-logic locks out the ignition
module and does not try to start it again until fault is cleared. Other ignition modules can run.
Yes
No
Yes
No
No
No
Continued
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OPERATION
System alerts
Table 45-1:
Alerts menu (continued)
Alerts labelDescription
Flue or tank over-temp cutout
Flue sensor out of rangeFlue temperature sensor signal is out of range.Yes
Drain sensor out of rangeDrain temperature sensor signal is out of range.Yes
Yellow Alerts
No airflowNo duct airflow.Yes
I-lock openInterlock safety switch is open.Yes
Freeze drainTank has drained to prevent freezing.Yes
End-of-Season (EOS) active The humidifier is draining or has drained and remains inactive until receiving another call for humidity.Ye s
Clean probesWater level control probes need cleaning. Check tank for cleaning.No
Duct HL tripDuct relative humidity has risen above the high limit set point, or high limit switch has opened.Yes
Insufficient waterThe low water probe is not in contact with water when there is a demand for humidity.Yes
Master enable openIndicates demand signal is being ignored due to master enable input being open.Yes
The listed flue temperature switch or tank temperature switch has opened. These switches will close after
the system has cooled.
Does alarm
auto-clear?
Yes
Hot drain water tempThe drain temperature has exceeded 145 °F (63 °C) for at least one minuteYes
Excessive foaming
Aux temp sense out of range Auxiliary temp sensor signal is out of range.Yes
White Alerts
Service unitRegularly scheduled unit servicing is due.No
Drain pendingAuto drain/flush will occur at next scheduled time.Yes
Temp comp on
Duct HL span
Replace ignitors soon
High flue temp, output
reduced
Hot drain water
Boiling temp calibrated
Notes:
• See the “Troubleshooting” section, beginning on Page 80, for alert possible causes and recommended actions.
• The Alerts Log displays alert name, date and time of occurrence, plus ”Active,” ”Cleared” or ”Auto-cleared.”
• Active alerts display first in the Alerts Log, followed by cleared alerts (auto-cleared and/or manually-cleared) listed in order of occurrence.
• The Alerts Log displays maximum 60 alerts. Cleared alerts leave the log first.
• If an alert event occurs and is not manually cleared or auto-cleared during unit operation, the alert will remain until there is demand and the unit is
running.
During normal operation top probe indicated "water", which was interpreted as foam. Foam drain will
occur.
Humidifier output has been reduced because temperature compensation sensor reads a temperature on
the inside-pane of an outside-wall window that could cause condensation.
Duct high limit transmitter has entered the throttle span range and is approaching duct high limit set
point.
Replace ignitors soon. Ignitors have been cycled to 80% of their expected life or there are other
indications the ignitors may be worn out.
Flue temperature is close to exceeding rated value. The output will temporarily be reduced by 50% to
allow the flue to cool.
The drain temperature has exceeded 145°F (63° C) for one minute. The drain tempering device may
not be working properly.
indicates actual humidifier boiling temperature at time of reading. Ths reading is taken after power-up
by the tank sensor at the time of first steam creation.
Yes
Yes
Yes
No
Yes
Yes
Yes
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OPERATION
Status LED (Vapor-logic control board)
STATUS LED (VAPOR-LOGIC CONTROL BOARD)
The Vapor-logic control board includes a diagnostic Status LED that shows multiple humidifier control conditions. The
Status LED blinks in a 3-stage cycle over approximately four seconds. The Status LED is always “blinking”. It will be
easy to see that the board is powered and operating because, at a minimum, it is running the Status LED.
The blinking will be in a 3-stage cycle starting from being dark with the LED brightness illuminating up to the first stage
of indication.
Timing of the 3-stage cycle will be over approximately four seconds.
See "Vapor-logic control board LED indicators" on page 47.
FIRST BLINK: FAULTS
A yellow first LED blink indicates there is one (or more) of four conditions present that will prevent the humidifier from
operating. These conditions can be viewed as a message through the Vapor-logic display:
1. The interlock switch on cabinet or tank is open (connected at ISW input on control board).
2. There is no airflow.
3. The duct humidity high limit has been exceeded.
4. The Master Enable input is open (P20 input on control board).
A red Status LED blink indicates there is an active fault preventing the unit from operating. These conditions can be
viewed as alerts through the Vapor-logic display.
If the first Status LED blink is blue, the unit is set to Standby or Test mode. Unit must be set to Auto Mode to enable
operation. The Mode can be set through the touchscreen, or through an associated building automation system (BAS).
A green Status LED blinks Auto mode with no faults.
SECOND BLINK: COMMUNICATION STATUS
For single-tank installations, green or red indicates communications status to the associated touchscreen display.
If the humidifier is part of a multi-tank system, Green indicates communications is occurring between the controller and
other controllers and/or the touchscreen display. Red indicates there is no communications occurring. If the Status LED
is red, check the communications wiring between the master and other slave units.
THIRD BLINK: HUMIDIFICATION DEMAND
Without humidification demand the humidifier will not run, and the third blink in the Status LED sequence will be blue.
Demand is created through a connected humidistat, humidity transmitter, or through an external source such as building
automation system (BAS). When there is a call for humidification (demand), the third Status LED blink sequence will be
green.
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Status LED (Vapor-logic control board)
VAPOR-LOGIC CONTROL BOARD STATUS LED (CONTINUED)
Table 47-1:
Vapor-logic control board LED indicators
First BlinkSecond BlinkThird Blink
LED Indicator
FaultsCommunications statusDemand/call for humidification
OPERATION
GreenAuto mode: no faults
Yellow
Red
Blue
Auto mode: active message
preventing unit from running
Auto mode: active fault preventing
unit from running
Standby or test mode: unit will not
run
Touchscreen display is attached and
working
——
Touchscreen display is not
communicating with controller
—No humidification demand present
Humidification demand is present
—
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OPERATION
Status LED (Touchscreen)
STATUS LED (TOUCHSCREEN)
The LED on the Vapor-logic touchscreen is located on the front, just below the active touch area. It remains solidly lit as
long as there is power (even when the Touchscreen is in sleep mode). The color indications are similar to those for the
Vapor-logic LED but it does not have a three blink sequence.
Table 48-2:
Touchscreen LED indicators
LED IndicatorModeDemand/call for humidification
GreenAuto mode: no faultsHumidification demand is present
YellowAuto mode: active alert preventing unit from running—
RedAuto mode: active fault preventing unit from running—
BlueStandby mode or auto modeNo humidification demand present
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PID tuning
OPERATION
When your system has a humidity or dew point transmitter, you can adjust
and control the set point through the touchscreen or Web interface using a
proportional, integral, and derivative (PID) control loop.
IMPROVES HUMIDIFIER RESPONSE TIME
With a PID loop, you can tune your system for maximum performance using the
proportional (Kp), integral (Ki), and derivative (Kd) gain terms.
Kp = Proportional gain factor
Ki = Integral gain factor
Kd = Derivative gain factor
These gain factors work in the following way: The overall demand in a PID
system is made up of three distinct parts—the proportional, the integral, and
the derivative. Each of these parts is calculated and then multiplied by its
corresponding gain factor. These gain factors are the setup variables you have
access to from the Settings menu. By making a gain factor larger, you increase
its overall influence on system demand. Once each PID component is multiplied
by its gain factor, all three terms are added together to determine the overall
demand percentage.
THE PROPORTIONAL TERM
The proportional term is the difference between the RH set point and the
actual humidity multiplied by the proportional gain. For example, with a Kp
of 80 and the actual humidity 5% below the RH set point, the proportional
contribution to the demand is:
5 × 80 × 0.085 = 33% (the 0.085 is an internal scalar used to increase the
usable span of Kp).
Settings menu
The Settings menu is where system parameters
can be changed. This menu is used primarily
during initial installation, but can also be
used for making changes or adjustments as
needed during operation. Note that while all
parameters can be changed, many changes
also require a corresponding hardware
change. Vapor-logic firmware will warn you of
this during the setup process.
See Setup, beginning on Page 27, for more
information about the Settings menu.
There is a problem with using only proportional gain to control the RH. In
almost all applications there is some constant load on the humidifier just
as there is a constant load on heating equipment. If the proportional term
is all that is used, the actual humidity must be less than the set point for the
humidifier to be on.
What happens is the humidifier finds a happy medium where the actual
humidity is something less than the set point, which allows the humidifier to
continue to run. This difference between the set point and the actual running
humidity level is called the droop. This droop can be corrected using the next
term, the integral.
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OPERATION
PID tuning
THE INTEGRAL TERM
The integral term is an accumulation of RH error over time multiplied by
the integral gain. Every 1/10 second when the demand is updated, the
instantaneous RH error (RH set point – actual RH) is added to a temporary
variable that accumulates the error. This accumulated error is multiplied by the
integral gain to create the integral term. The integral gain affects how fast the
humidifier corrects a droop condition. The higher the integral gain (Ki), the
faster the reaction. (An integral gain of zero disables this variable and allows
the unit to run on the proportional term only.)
With an integral gain term greater than zero and an actual humidity below set
point, the demand increases slightly with each update. If the actual humidity
is above set point, the demand decreases slightly. The amount it increases
or decreases depends on the magnitude of the RH error and the integral
gain value. The closer you are to the set point, the smaller the addition or
subtraction.
When looking at this control scheme, an interesting pattern occurs. The total
demand signal for the humidifier is the sum of the proportional part, the
integral part, and the derivative part. As the actual humidity approaches the
set point, the integral portion makes up the majority of the demand, and the
proportional part makes up very little. Once the set point is reached and the
unit stabilizes, the entire demand is made up of the integral part because the
proportional part is zero.
If the actual humidity goes over the set point, the integral term starts to
decrease. In addition, the proportional term becomes negative and actually
starts to subtract from the total system demand. These two terms work in
conjunction with each other to bring the humidifier back to set point.
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PID tuning
THE DERIVATIVE TERM
The derivative term is the measured change in error over time multiplied by the
derivative gain (differentiating error with respect to time).
If the actual measured RH is below set point and is rising, the derivative term
subtracts from the demand in anticipation of the approaching set point.
If the actual measured RH is below set point and is falling, the derivative term
adds to the demand in anticipation of the need to get the demand up faster
and start climbing toward set point.
If the actual measured RH is above set point and falling, the derivative term
adds to the overall demand in anticipation of the approaching set point.
It generally is used to increase damping and, in some cases, improves the
stability of the system.
However, in the majority of control situations, the derivative term is not needed
and is simply set to zero. The proportional term and integral term provide tight,
accurate control without the addition of the derivative term.
OPERATION
PID BAND
The last user-controlled term in the PID equation is the PID band. The PID band
defines the range of measured RH values (°F/°C for dew point control) where
the PID loop is in operation. The PID loop is in operation when the measured
RH is in the range of (RH set point – PID band) to (RH set point + PID band). If
the measured RH is below the PID band, the PID calculations are suspended
and the demand is set to 100%. Conversely, if the measured RH is above the
PID band, the demand is set to 0%.
For example, if starting with an RH set point of 35% and a PID band of 10%,
the PID loop operates when the actual humidity is in the range of 25% to 45%.
If the actual humidity is lower than 25%, the humidifier is full on. If the actual
humidity is above 45%, the humidifier demand is 0%. The PID band aids in
speeding the response time of the system. It allows the RH to get somewhat
close to the set point and then lets the PID loop precisely control the RH when it
is within the PID band. The default value for the PID band is 10%.
Large spaces where the humidification system influences the RH very
slowly typically benefit from a smaller PID band. Small spaces where the
humidification system can quickly influence the RH typically benefit from a
larger PID band. Rarely should it be set to less than 10%.
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OPERATION
PID tuning
PID SETUP TIPS
A large PID band (10% to 20%) yields tighter and more stable control with
longer response times. A small PID band produces quicker response times, but
control may become unstable if the RH regularly goes outside the band.
As a rule, start with a PID band of 10%. When the humidifier is operating at
steady state, make sure the RH does not go outside the PID band. The intent of
the PID band is to quickly get the RH into a controllable range. To increase or
decrease the effect of the proportional term on system performance, adjust the
proportional gain (Kp).
However, for the majority of systems, the factory default setting of 80 is
sufficient. Generally speaking, a large integral gain (Ki) quickens the system
response but may cause it to oscillate and become unstable. A small integral
gain yields tighter, more stable control at the expense of a long response time.
These principles can be applied in the following examples: If a system
eventually reaches the desired RH level but takes a long time to do so without
overshooting the set point, faster response can be achieved by increasing the
integral gain. If the measured RH oscillates above and below the set point
numerous times before finally reaching set point, decrease the integral gain.
Typically, if a large adjustment is made to the integral gain, better response
is achieved by decreasing the magnitude of the change. Then, modify the
proportional gain slightly in the same direction the integral gain was changed.
RH history data, available for download from the Diagnostics menu, can aid
when doing PID loop tuning.
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Universal water level control
OPERATION
The Universal Water system allows the Vapor-logic controller to identify the
water type using a three-probe assembly. All water types and conductivities
work with the universal water system. The user does not need to select a new
water type or change hardware to change water types. Additional valves
and Vapor-logic algorithms measure and control the water level for optimum
efficiency and low water safety conditions. Vapor-logic automatically provides
a steady output while maintaining the water level between the bottom and
middle probes.
Water must remain in contact with the probe surface for three seconds for
Vapor-logic to determine that the water is at the probe’s level. Conversely,
water must stay out of contact with the probe surface for three seconds
for Vapor-logic to determine that the water is below the probe’s level. This
three-second delay ensures that turbulence does not cause an incorrect level
reading. If the water level falls below the low-water cutoff probe for a time
period determined by Vapor-logic, heating outputs are disabled; this provides
low-water protection for the heating outputs. If Vapor-logic detects water on
the top probe Vapor-logic will assume there is foam and a foam drain will start
immediately.
The humidifier will periodically perform probe checks to insure that the probes
are being read accurately and to determine the quality of the incoming water.
The humidifier status on the home screen will show “Probe Check”. After a
probe check the humidifier will adjust the Smart Drain usage interval used for
the automatic drain sequence. If the signal from the probe assembly begins
to deteriorate, the “Clean probes” or “Check Water Probe” message appears
in the Alert log. Once the probe system reaches its maximum usable life, the
humidifier shuts down and the user gets a “Faulty Water Probe” active alert.
CAUTION
Chloride corrosion
Damage caused by chloride corrosion
is not covered by your DriSteem
warranty.
Chloride corrosion can result from a
variety of causes, including, but not
limited to
• Improper water deionization
processes
• Improper water softening processes
• Humidifier’s supply water
FIGURE 53-1: WATER LEVEL CONTROL
Water level
is controlled
electronically using
three probes
Overflow/foam detection
Full
Low
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OPERATION
Automatic drain sequence, all water types
Vapor-logic uses an automatic drain sequence (ADS) to reduce mineral
accumulation in the tank and drain line which decreases tank maintenance.
Automatic draining and flushing parameters are defined in the water
management section of the Settings menu:
• First, automatic draining and flushing must be enabled.
• Second, the amount of water converted to steam (Usage) before an
automatic drain sequence begins must be defined in Settings/Water
Management/Automatic Drain Sequence.
• With a Smart Drain interval type, Vapor-logic will dynamically change
the usage between drains depending on detected water quality. This
allows for less frequent drains for clean water and more frequent drains
for water with many dissolved solids. (Smart Drain is the default usage
choice).
• With a Static interval Vapor-logic always uses the same usage interval.
The default value is model-specific and calculated based operating 100
hours at 100% capacity. The user can change the usage value to get
more or less frequent drains.
• Third, days of the week when the automatic drain sequence can occur
must be defined. This means that once the Usage requirement is met, the
automatic drain sequence can occur on the first allowed day (allowed days
default is all days).
• Last, time of day when the automatic drain sequence occurs must be
defined (default value is midnight).
For example, if you use factory static default settings for the automatic drain
sequence, the first automatic drain sequence will occur at midnight on any
day of the week once the model-specific usage requirement has been met. If
you want to change these settings, go to the water management section of the
Settings menu.
For RO/DI water DriSteem recommends enabling the automatic drain sequence
with the Smart Drain option. The humidifier will drain very infrequently but just
enough to protect the tank from aggressive water.
Sequence of operation for the automatic drain sequence: ADS starts by
opening the drain valve to empty the tank. When the drain duration ends, the
fill and drain valves remain open to flush the tank. When the flush duration
ends, the automatic drain sequence is complete and the humidifier resumes
normal operation. During all of these actions the home screen will display a
tank status of “Auto Drain”. The default drain and flush durations are modelspecific and can be adjusted in the water management section of the Settings
menu.
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Options and features
FOAM DRAIN
When foam reaches the top probe of the water probe assembly Vapor-logic
initiates an immediate Foam Drain. The humidifier is not allowed to produce
steam with foam in the tank because the water detection system may read
inaccurately, causing a safety issue. The Foam Drain sequence will drain
the foam, flush the foam out, refill the tank and then restart. The Foam Drain
feature cannot be disabled. This feature is similar to the Auto Drain for the
Automatic Drain Sequence but it does not wait for Usage or allowed time and
day requirements.
DUCT HIGH LIMIT SWITCH OPTION
When a duct high limit option is ordered, DriSteem provides either a duct
high limit switch or a duct high limit humidity transmitter (4 to 20 mA output,
0 to 100% RH range) for duct mounting.
The duct high limit switch prevents duct saturation by turning off the humidifier
when reaching the device set point. When this occurs, a “Duct HL trip”
message appears in the Alert Log of the touchscreen and a message appears
in the Messages Log and autoclears when duct RH drops below the duct high
limit set point.
OPERATION
MODULATING HIGH LIMIT TRANSMITTER OPTION
The modulating high limit transmitter operates in conjunction with the room/
duct controlling transmitter or demand signal through the Vapor-logic control
system to prevent excess humidification in the duct. Vapor-logic starts lowering
the humidifier output when the duct relative humidity is within a user-defined
percentage (default is 5%) of the duct high limit set point. This value is called
the duct high limit span and is defined during Setup.
When duct relative humidity enters this range, a “Duct HL span” alert appears
in the Alert Log of the touchscreen and a message appears in the Message
Log of the Web interface. If necessary, the reduction of the humidifier output
continues until maximum high limit set point is reached, shutting off the
humidifier completely. If this occurs, a “Duct HL trip” alert appears in the Alert
Log of the touchscreen and a message appears in the Message Log of the Web
interface.
When the high relative humidity starts to decrease in the duct, Vapor-logic
slowly starts to increase steam production. When the duct relative humidity
decreases to greater than the defined percentage below the duct high limit
set point, the control transmitter or signal by others demand signal is restored
as the primary controller, returning the control system to normal operation,
and the messages in the Message Log of the Web interface and active alerts
automatically clear.
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OPERATION
Options and features
TEMPERATURE COMPENSATION CONTROL OPTION
When selected as an option, DriSteem provides a temperature compensation
transmitter. The temperature compensation transmitter continually monitors
interior window glass temperature and transmits this temperature to
Vapor-logic.
Vapor-logic assumes a 70 °F (21 °C) room temperature and uses the glass
temperature and the RH in the space being controlled to calculate the dew
point (°F or °C) for the space.
If the window temperature falls below the dew point, Vapor-logic automatically
decreases the RH set point so moisture does not form on windows. The Home
screen displays the modified RH set point, and an alert of "Temp Comp On"
appears in the Alert Log of the touchscreen and a message appears on the
Web interface, denoting that temperature compensation has taken control of
the RH set point. When the interior window glass temperature rises above the
dew point, Vapor-logic restores system control to the normal RH set point for
the space, and the “Temp comp on” message and alerts automatically clears.
The temperature compensation control option is available only when the
system is equipped with an RH transmitter. It is not available when a remote
humidistat, dew point transmitter, or building automation system is used to
control the humidifier.
The transmitter provided with Vapor-logic is calibrated for –20 °F to 160 °F
(–29 °C to 71 °C) with output from 4 to 20 mA. For example, a temperature
reading of 70 °F (21 °C) should produce a measurement of 12 mA. You can
calibrate the sensor by adjusting the offset in the auxiliary temp sensor section
of the Status menu of the touchscreen or Diagnostics menu of the Web interface
menu.
AUXILIARY TEMPERATURE SENSOR OPTION
When selected as an option, DriSteem provides a temperature sensor for
monitoring temperature in a duct or space. Temperature from this sensor can
be viewed from the Status menu (“Aux temperature”).
TANK PREHEAT FEATURE
The tank preheat feature heats the water in the tank to near boiling to allow a
rapid response to a demand signal. If the tank is cold when a small demand
signal is present, the Vapor-logic controller overrides the demand signal and
heats until the tank temperature increases to the boiling point. At this point,
control is returned to the original demand signal.
Preheating allows the system to respond quickly to small demand requests.
When preheating, the word “Heating” appears on the Home screen.
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Options and features
AQUASTAT SET POINT FEATURE
The aquastat set point is the minimum tank temperature the Vapor-logic
controller maintains when there is no call for humidity or when safety circuits
are not satisfied (e.g., high limit or airflow proving switch). The aquastat set
point is adjusted through the water management section of the Settings menu.
This feature shortens the tank preheat time, providing a rapid response to a
call for humidity.
For example, if the aquastat is set at 180 °F (82 °C) when a call for humidity
occurs, the tank only needs to warm up 32 °F (18 °C) to reach the boiling
point. However, if the aquastat is at its minimum default setting of 40 °F (4 °C)
and the tank is in an average-temperature occupied room, when a call for
humidity occurs, the tank needs to warm up from room temperature to the
boiling point before producing steam. When an aquastat call is heating the
tank, the word “Heating” appears on the Home screen. Aquastat heating will
occur with high-limit and airflow alarm conditions.
OPERATION
FREEZE PROTECTION
Freeze protection is similar to aquastat operation with some exceptions. The
freeze protect set point is fixed at 40 °F (4 °C). Its purpose is to prevent the
tank from freezing in cold environments. Unlike aquastat, if a condition exists
that prevents the heaters, burners, and valves from firing (such as an alarm, an
external interlock switch is open, or the humidifier is in Standby mode), instead
of remaining idle, the controller switches to manual drain run mode and the
tank drains to prevent freezing. Change mode to Auto to resume operation.
When the tank is heating to prevent freezing, the word “Heating” appears
on the Home screen. When the tank is draining or has drained to prevent
freezing, the “Freeze drain” message appears in the Messages Log of the Web
interface and an alert appears in the Alert Log of the touchscreen.
FAN-BASED DISPERSION OPERATION
If your humidifier is equipped with a Space Distribution Unit (SDU) or an
Area-type fan, it is enabled after the Vapor-logic controller receives a call for
humidity and the tank water is approaching boiling temperature.
When the humidifier no longer receives a call for humidity, it stops heating and
the SDU or Area-type fan continues to run for the time delay period (as defined
in the fan-based dispersion section Settings menu).
Note: The Fan Dispersion option appears in the Settings menu of the
touchscreen only if the humidifier was originally ordered with fan or SDU
dispersion. To change to duct dispersion, consult with DriSteem technical
support and use the Web interface to choose Fan Dispersion.
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OPERATION
Options and features
SENSOR OFFSETS
All external transmitters shipped with Vapor-logic can be field calibrated
from the Settings menu. For example, if the system is equipped with an RH
transmitter, there is an RH offset setting.
The factory default for all transmitter offset settings is zero. The sensors that
have this adjustment capability are the humidity, duct high limit, temperature
compensation, and dew point transmitters.
SKIM TIMER
The Vapor-logic controller has a skim timer. This timer is activated at the end
of each probe check. The timer keeps the fill valve open (for a user-determined
amount of time) to skim minerals off the water surface. The skim time is
adjusted through water management in the Settings menu.
END-OF-SEASON DRAIN
If there is no call for humidity for a user-defined time period, the humidifier
performs an end-of-season (EOS) drain where the drain valve remains open
for ten hours to allow the tank to drain and then closes. If the humidifier
receives a call for humidity after the ten-hour end-of-season drain-down period
has begun, the controller stops the end-of-season draining, the tank refills,
and the humidifier resumes normal operation. The user-defined inactivity time
period (idle time) is defined in the end-of-season drain section of the water
management settings menu.
SERVICE INTERVAL
The Vapor-logic controller tracks the amount of water converted to steam by the
humidifier and the number of hours the humidifier runs. When the amount of
steam or hours of run time exceeds the user-defined service interval (pounds,
kilograms, or hours, adjusted in the Settings menu), “Service unit” appears in
the Messages Log on the Web interface or in the Alert Log on the touchscreen
display. On the touchscreen display Status and Quick Diagnosis screens the
user will also see the words Service Due: Yes.
The humidifier continues to operate after the alert appears. The alert notifies
the user that the service interval was reached and the humidifier should be
cleaned. The alert remains active until the user manually clears it, indicating
that the cleaning was completed.
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Options and features
SETTING DATE AND TIME
The Vapor-logic controller contains a real-time clock that is used for several
features including the drain and flush sequence and alarm logging. If you need
to reset the date or time, go to the Settings menu.
Note: Verify the date and time settings after every firmware upgrade.
BATTERY BACKUP, NONVOLATILE MEMORY
If there is a power outage, date and time settings will be saved. Alerts, unit
configuration, and usage timers will remain in nonvolatile memory indefinitely.
When the battery is getting low a "Check Battery" alert will appear in the Alert
Log on the touchscreen and in the Message Log of the Web interface.
SECURITY/PASSWORD
To control who can change Vapor-logic settings, enable the security function
and define a password in the Settings menu. Enter four digits, numbers only,
and define the time-out period (minutes of inactivity before Vapor-logic reverts
to read-only mode). The Web interface and the touchscreen can have separate
passwords.
OPERATION
Important: Write down the password and keep in a secure location.
PASSCODE FOR TOUCHSCREEN DISPLAY
On the touchscreen display choose a passcode immediately following the
choice of Require Passcode: Yes. If security is required and the passcode was
not set, try the Vapor-logic default of 0000. If a passcode has been set and
then forgotten, contact DriSteem Technical Support.
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OPERATION
Options and features
DOWNLOADING HISTORICAL DATA
Vapor-logic acquires data at a default interval of once a minute and retains it
for 21 rolling days or 30,000 data points, including the most recent 60 alerts.
Download the data to a USB storage device and then view with a spreadsheet
program such as Microsoft Excel or Google Sheets. The data, available for
download and sorting, contain the details shown in Table 60-1.
Go to the Download data section of the Diagnostic screen for download
options.
Table 60-1:
Sample of data log downloaded and sorted
Time
1/26/10 9:36 AM230212567019018 42106623
1/26/10 9:37 AM230212567021350 42106823
1/26/10 9:38 AM230211567023681 42107023
1/26/10 9:39 AM
1/26/10 9:40 AM230210567028344 42107323
1/26/10 9:41 AM230211567030677 42107523
SpaceRH or
Demand
Aux Temp
(°F)
Tank Temp
(°F)
BTU’s used
Lbs
steam
Output
(%)
Alarm/
Msg
low water
cutout
Note: Data is saved to nonvolatile memory
every 60 minutes. If unit power is lost,
up to 60 minutes of data could be lost.
Alarm/Msg
Status
Auto cleared
message
Current Config:
xx##xx#x###xx
——
Factory Config:
xx##xx#x###xx
1/26/10 9:42 AM230212567033008 42107723
1/26/10 9:43 AM230212567035339 42107923
1/26/10 9:44 AMUnit Start
To sort data (as shown above) with alerts listed in the order they occurred:
1. Import the data into a spreadsheet program, such as Microsoft Excel.
2. Set the Time column to be displayed in the date-time format.
3. Sort all rows by “Time” in ascending order.
BACKING UP AND RESTORING SETTINGS
Vapor-logic settings can be backed up to and restored from a USB flash drive.
The backup file contains all information relative to the humidifier, including
firmware, user settings, model number, serial number, and the configuration
string.
Backup files use the serial number in the backup file name so that the file is
easily matched to a particular humidifier.
Auto cleared
message
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Firmware updates
To create a backup file:
1. Insert a USB flash drive into the USB port on the Vapor-logic board.
2. Go to Settings/USB backup-restore/Back up settings
3. Select Yes. The display will prompt you when backup is complete.
To restore from a backup file:
1. Insert a USB flash drive with that humidifier’s backup file into the USB port
on the Vapor-logic board.
2. Go to Settings/USB backup-restore/Restore settings.
3. Select Yes. Note that the serial number of the humidifier and backup file
must match to complete the restore process.
DOWNLOADING FIRMWARE UPDATES
The Vapor-logic controller and the touchscreen display firmware can be field
upgraded to the latest firmware version via the USB port on each device.
Firmware updates are available at no charge on the DriSteem website. One
download from the DriSteem web site will give you all files needed to update
both Vapor-logic and the touchscreen display.
OPERATION
To update your Vapor-logic controller and/or touchscreen display to the latest
firmware version, perform the following procedure:
1. Navigate to www.dristeem.com.
2. Go to Support & Literature on the site navigation menu.
3. Select Technical Support.
4. Click on firmware updates.
5. Navigate to Vapor-logic6 and click version download link.
6. Plug a reliable USB flash drive into a USB port on your computer, and
prepare the flash drive as follows:
a) Move or delete all files from the drive.
b) Make sure it has at least 16 MB of free space.
c) Make sure it is not partitioned into multiple drives.
7. Perform the procedure in Table 62-1.
8. Repeat the procedure in Table 62-1 to get the Vapor-logic6 touchscreen
display update files. They can be placed on the same USB stick.
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
6. Click the Browse button in the WinZip Self-Extractor window, and select your
USB flash drive as the target location.
7. Click the Unzip button in the WinZip Self-Extractor window.
OPERATION
A WinZip window opens to confirm that the firmware update has been
unzipped.
8. Click the OK button.
9. Click the Close button to close the WinZip Self-Extractor window.
10. Open your USB flash drive. Confirm that it contains a folder named
vl6_update_xx.xx.xx (where x represents the version number) and that it has
today’s timestamp.
11. Remove the USB flash drive from your computer.
12. Proceed to “Installing firmware updates” on Page 64.
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OPERATION
Firmware updates
INSTALLING FIRMWARE UPDATES
1. Place the humidifier system in Standby mode.
WARNING
2. IMPORTANT: To prevent static damage to the USB flash drive and
controller, ground yourself by briefly touching the humidifier’s electrical
subpanel before touching any part of the controller board or doing Step 3.
See the Warning.
3. With the board powered, insert the USB flash drive loaded with the
unzipped firmware update folder into the Vapor-logic board USB port.
CAUTION
Do not remove USB flash drive or cycle power early
During Steps 4 and 5, do not remove the USB flash drive or cycle the power until
the signal occurs as explained in Step 5.
4. The update process begins immediately and takes up to 1 minute. Wait
for the relay on the Vapor-logic board to begin clicking continuously. The
water probe LEDs on the board will blink occasionally during the update
process.
5. When the relay on the Vapor-logic board begins to click continuously,
remove the USB flash drive from the Vapor-logic board USB port.
When the USB flash drive is removed, the Vapor-logic controller and
display reboot with the updated firmware.
6. Verify the update by checking the Vapor-logic firmware version as follows:
Electric shock hazard
All circuits must be energized for this
firmware update procedure. Contact
with energized circuits can cause
severe personal injury or death as a
result of electric shock.
To prevent shock when grounding
to the electrical subpanel, touch the
subpanel along its edge, away from
wires and components.
a. Select Settings in the touchscreen display Main menu.
b. Select Humidifier info.
c. Scroll down to Firmware version.
The firmware version displayed should match the version number of the
vl6_update xx.xx.xx folder on the USB flash drive (where x represents the
version number).
7. With the board still powered:
a. Insert the USB stick with the unzipped firmware into the touchscreen
display. The display will reboot.
b. Go to Settings/Display/Humidifier Info and verify that the display
firmware version has been updated.
8. Verify humidifier operation, and return it to service.
Not all USB drives perform equally. If a USB flash drive fails to update the
Vapor-logic firmware, perform the procedure with a different USB flash
drive.
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Test outputs and test run
TEST OUTPUTS
When completing an installation or repair, cycle all outputs, such as fill valve,
drain valve, etc., to verify operation. Go to the test outputs section of the
Settings menu and scroll through each connected output to verify operation.
During testing, the humidifier mode changes to Standby and the tank status
changes to Test.
TEST RUN
Vapor-logic has a test run capability to confirm system functionality. This
capability allows a technician to simulate a demand for steam production
when there isn’t one (such as when performing routine maintenance). To
confirm functionality, go to the test run section of the Settings menu. Set system
demand percent and set test run time duration. During testing, the humidifier
mode changes to Standby and the tank status changes to Test.
Table 65-1:
Test outputs and test run
Test outputs
Menu itemDefault value
Minimum
value
Maximum
value
UnitsDescription
OPERATION
Fill valve----Cycles output to verify operation.
Pulse fill valve----
Drain valve----
Cycles output to verify operation.Fan control----
Dry contact relay 1 or 2----
Ignition module 1 or 2----
Blower speed control----Tests both blowers,
Test run*
Test run percent 00100%Set demand percent value between 0 and 100 to test.
Test run time0030minutesSet test run time duration between 1 and 30 minutes.
Start
Stop
* Humidifier test run will not occur if safety circuits (for example, duct high limit switch, airflow proving switch, or safety interlock switch) are not
operating correctly.
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OPERATION
Modbus, BACnet, LonTalk interoperability
Vapor-logic comes standard with Modbus or BACnet, or with LonTalk if
ordered. Vapor-logic can connect to building automation systems using these
protocols. Variables are defined in the tables on the following pages.
Note: For LonTalk installations, contact your local DriSteem representative to
purchase a LonTalk upgrade.
CONNECTIONS
1. If connecting to a Modbus or BACnet MS/TP system, connect Modbus or
BACnet system wiring to terminal P7 on the Vapor-logic board (positive to
positive, negative to negative).
If connecting to a BACnet/IP system, connect BACnet system wiring to the
Ethernet connection.
2. If connecting to a LonTalk system, connect the LON ProtoCessor module
per Step 3 in Figure 66-1.
3. Disconnect power to the Vapor-logic board, wait 5 seconds, and reconnect
power.
4. Set up communication with Vapor-logic using your Modbus, BACnet, or
LonTalk network manager, referencing Table 67-1.
INSTALLING LONTALK AS A RETROFIT
1. Turn off power to the unit.
FIGURE 66-1: LON PROTOCESSOR
MODULE INSTALLATION
1. Remove LON ProtoCessor
module from box.
2. Insert LON ProtoCessor module into
pins on Vapor-logic board.
Bottom of LON
ProtoCessor
module
2. Touch the unit’s bare metal frame before handling the LON ProtoCessor
module, and hold onto frame while handling the module.
3. While handling the module, hold it by the edge. Avoid touching the
components or circuit board.
4. Plug LON ProtoCessor module into mounting pins (as shown in Figure
66-1) with LonTalk connector at the edge of the board. Make sure all
pins are seated in the connector.
5. Connect LonTalk system wires to LON ProtoCessor module as shown in
Step 3 at right.
6. Turn on power to the unit.
7. Using either the touchscreen or Web interface go to the Communications
section of the Settings menu to enable LonTalk communication.
8. Set up communication with Vapor-logic using your LonTalk network
manager, referencing Table 67-1.
Vapor-logic board
3. Connect wiring from LonTalk system to
LON ProtoCessor module on
Vapor-logic board.
Connect LonTalk
system wires to LON
ProtoCessor module here.
NOTE: Orient the LON ProtoCessor module as
shown, with wire connectors end at the side of
the Vapor-logic board.
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Modbus, BACnet, LonTalk interoperability
Note: The interoperability partner will see the full list with points that apply to
other models. The following is a subset of that list and includes only the points
that are applicable to the GTS humidifier LX series.
Table 67-1:
GTS humidifier LX series interoperability variable and object names
IR-1
IR-2
IR-3
IR-4
IR-5
IR-6
IR-7
IR-8
IR-9
BACnet
Object
Type and
Instance
AI-01 nvoSpaceRH
AI-02 nvoSpaceDewPoint
AI-03 nvoDuctRH
AI-04 nvoSteamDmndMass
AI-05 nvoSteamDemandP
AI-06 nvoAuxTemp
AI-07 nvoTankTemp
AV- 1nvoSteamOutMass
AV- 2nvoSteamOutputP
AV- 3nvoWaterUntilADS
AV- 4nvoWaterTilSrvc
LonTalk variable
names**
Description
Relative humidity content
of the air in the space
being humidified.
Dew point of the air
in the space being
humidified.
Relative humidity content of
air in the duct.
Steam demand in pounds
or kilograms per hour.
Steam demand as
a percentage of the
humidifier’s total capacity.
Temperature of auxiliary
temperature sensor.
Temperature of the
water in the humidifier’s
evaporating chamber.
Estimated amount of
steam the humidifier is
producing in pounds or
kilograms per hour.
Estimated amount of
steam the humidifier
is producing as a
percentage of the
humidifier’s total
capacity.
Pounds or kilograms
of water remaining to
be converted to steam
before the next automatic
drain sequence (ADS)
cycle.
Pounds or kilograms of
water remaining to be
converted to steam before
next service cycle.
Variable name and
BACnet object name
Read-only analog variables
Space_RHRO
Space_dew_pointRO
Duct_RHRO
Steam_demand_massRO
Steam_demand_percentRO
Aux_tempRO
Water_tempRO
Steam_output_massRO
Steam_output_percentRO
Water_until_ADSRO
Water_until_serviceRO
* See Note 1 on Page 73.
** See Note 2 on Page 73.
Read Only
(RO) or
Read Write
(RW)
Modbus
register
number*
30001
30002
30003
30004
30005
30006
30007
30008
30009
IR-10
30010
IR-11
30011
OPERATION
UnitsRange
I-P units SI unitsI-P unitsSI units
%%0 to 1000 to 100
ºFºC20 to 80-6 to 26
%%0 to 1000 to 100
lbs/hrkg/h
%%0 to 1000 to 100
ºFºC-20 to 160 -29 to 170
ºFºC
lbs/hrkg/h
%&0 to 1000 to 100
100
100
lbs
lbs
100
kg
100
kg
0 to
100,000
-240 to
265
0 to
100,000
0 to
2,200,000
0 to
2,200,000
0 to
100,000
-151 to 129
0 to
100,000
0 to
1,000,000
0 to
1,000,000
Continued
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OPERATION
Modbus, BACnet, LonTalk interoperability
Table 68-1:
GTS humidifier LX series interoperability variable and object names (continued)
Variable name and
BACnet object name
Read-only analog variables (continued)
MT_sys_output_mass_hrRO
MT_sys_output_pcntRO
Setup variables
Run_mode
Space_RH_set_pointWrite
Space_dew_point_set_pointWrite
Duct_high_limit_set_pointWrite
* See Note 1 on Page 73.
** See Note 2 on Page 73.
Read Only
(RO) or
Read Write
(RW)
Write
Read
Modbus
register
number*
IR-23
30023
IR-25
30025
HR-1
40001
HR-1
40001
HR-2
40002
HR-3
40003
HR-4
40004
BACnet
Object
Type and
Instance
AI-08nvoMT_SteamOMass
AI-09nvoMT_SteamOP
MSV-01 nviRunMode
MSV-01 nvoRunMode
AV-05 nviSpaceRHsetPt
AV-06 nviSpaceDewPtSP
AV-07 nviDuctHLsetPt
LonTalk variable
names**
MT steam demand
mass
MT steam demand
percent
Mode of the unit or
system. The defined
options are:
1 Auto
2 Local standby
3 System standby
4 Manual drain
Mode of the unit or
system. The defined
options are:
1 Auto
2 Local standby
3 System standby
4 Manual drain
5 Test outputs
6 Test run
Humidity set point
for the space being
humidified.
Dew point set point
for the space being
humidified.
Duct high limit set
point.
Description
UnitsRange
I-P units SI units I-P units SI units
lbs/hrkg/h
%%0 to 100 0 to 100
----1 to 41 to 4
----1 to 61 to 6
%%0 to 100 0 to 100
ºFºC20 to 80 -6 to 26
%%0 to 100 0 to 100
0 to
100000
0 to
100000
Continued
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
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Modbus, BACnet, LonTalk interoperability
Table 69-1:
GTS humidifier LX series interoperability variable and object names (continued)
Variable name and
BACnet object name
Setup variables (continued)
Fieldbus_demand_mass Write Only
Fieldbus_demand_%Write Only
PID_bandRW
PID-KpRW
PID-KiRW
PID-KdRW
MT_runmode
MT_steam_req_mass_hr Write Only
MT_steam_req_sys_pcnt Write Only
* See Note 1 on Page 73.
** See Note 2 on Page 73.
Read Only
(RO) or
Read Write
(RW)
Write
Read
Modbus
register
number*
HR-5
40005
HR-6
40006
HR-7
40007
HR-8
40008
HR-9
40009
HR-10
40010
HR-14
40014
HR-14
40014
HR-15
40015
HR-17
40017
BACnet
Object
Type and
Instance
AV-08 nviFbusDemndMass
AV-09 nviFldBusDemandP
AV-10 nciPIDbandPID band.%%0 to 500 to 50
AV-11 nciPIDkp
AV-12 nciPIDki
AV-13 nciPIDkd
MSV-02 nviMTRunMode
MSV-02 nvoMTRunMode
AV-14 nviMT_FBDmndMass
AV-15 nviMT_FBDmndP
LonTalk variable
names**
Description
Steam output (as
demanded via fieldbus)
in pounds or kilograms
per hour. If the request
exceeds the unit’s
capacity, the unit will run
at 100% capacity.
Steam output (as
demanded via the
fieldbus) as a percentage
of the humidifier’s total
capacity.
PID-Kp (proportional
gain) factor.
PID-Ki (integral gain)
factor.
PID-Kp (derivative gain)
factor.
"MT runmode;
1 = system standby,
2 = system auto"
"MT runmode;
1 = system standby,
2 = system auto"
MT fieldbus request
for steam in pounds or
kilograms per hour
MT fieldbus request for
steam in percentage of
system capacity
OPERATION
UnitsRange
I-P units SI units I-P unitsSI units
lbs/hrkg/h
%%0 to 100 0 to 100
----
----
----
----1 to 21 to 2
----1 to 21 to 2
lbs/hrkg/h
%%0 to 100 0 to 100
0 to
100,000
0 to
1000
0 to
1000
0 to
1000
0 to
100000
0 to
100,000
0 to 1000
0 to 1000
0 to 1000
0 to
100000
Continued
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
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OPERATION
Modbus, BACnet, LonTalk interoperability
Table 70-1:
GTS humidifier LX series interoperability variable and object names (continued)
Variable name and
BACnet object name
Read-only digital I/O
Airflow_proving_switchRO
Duct_HL_switchRO
Safety_interlockRO
Combustion_air_damper_RO
Flue_pressure_switchRO
Power_vent_switch_RO
Fill_valveRO
Drain_valveRO
MT_active_fault_exists_
somewhere
MT_active_message_exists_
somewhere
* See Note 1 on Page 73.
** See Note 2 on Page 73.
Read Only
(RO) or
Read Write
(RW)
RO
RO
Modbus
register
number*
DI-1
10001
DI-2
10002
DI-3
10003
DI-4
10004
DI-5
10005
DI-6
10006
DI-8
10008
DI-9
10009
DI-10
10010
DI-11
10011
BACnet
Object
Type and
Instance
BI-01nvoAirflowSwitch0=Open; 1=Closed
BI-02nvoDuctHLswitch0=Open; 1=Closed
BI-03nvoSafetyI-lock0=Open; 1=Closed
BI-04nvoCombustAirDmp
BI-05nvoFluePressurSw0=Open; 1=Closed
BI-06nvoPowerVentSwch
BO-01 nvoFillValve0=Closed; 1=Open
BO-02 nvoDrainValve
BI-08nvoMt_AlarmSomWr 0=No; 1=YesMulti-tank only
BI-09nvoMt_MsgSomWr0=No; 1=YesMulti-tank only
LonTalk variable
names**
0=Damper Closed;
1=Damper Open
0=Vent Off; 1=Vent
On
0=Not Draining;
1=Draining
UnitsRange
Description
I-P units SI units I-P units SI units
--------
Continued
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
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Modbus, BACnet, LonTalk interoperability
Table 71-1:
GTS humidifier LX series interoperability variable and object names (continued)
10
11
12
13
14
15
16
17
18
19
20
BACnet
Object
Type and
Instance
BV-01 nvoDryContact1
1
BV-02 nvoDryContact2
2
BV-03 nvoAlarms
3
BV-04 nviClearAllFault
4
BV-05 nvoAlrmTnkTmpSen
5
BV-06 nvoAlrmOvertemp
6
nvoAlrmRHsignal
BV-07
7
8
9
nvoAlrmDewPtSgnl
nvoAlrmDemndSgnl
BV-08 nvoAlrmDuctRHsig
BV-09 nvoAlrmAuxTemp
BV-10 nvoAlrmProbeWire
BV-11 nvoAlrmProbeFail
BV-12 nvoAlrmFillTime
BV-13 nvoAlrmRefilTime
BV-14 nvoAlrmNoDrain
BV-15 nvoAlrmXessWater
BV-16 nvoAlrmNoSDUair
BV-17 nvoAlrmPrVentAir
BV-18 nvoAlrmNoCombAir
BV-19 nvoAlrmBlockdFlu
BV-20 nvoAlrmBurner1
LonTalk variable
names**
0=Open; 1=Closed
Flag that a manual
clear alarm exists in
the system
When set will clear all
active faults
Variable name and
BACnet object name
Faults and alarms
ProgOutput1_statusRO
ProgOutput2_statusRO
Active manual clear alarms exitRO
Clear all active alarmsRW
Tank temp sensor failedRW
Tank overtemp, Unit reboot
required
Signal at RH input out of rangeRW
Duct RH sig out of rangeRW
Aux temp sense out of rangeRW
Check water probeRW
Faulty water probeRW
Excessive fill timeRW
Excessive refill timeRW
Tank not drainingRW
Excessive boil time, Unit reboot
required
No SDU airflowRW
No power vent airflowRW
No combustion airflowRW
Blocked flueRW
Burner 1 faultRW
* See Note 1 on Page 73.
** See Note 2 on Page 73.
Read Only
(RO) or
Read Write
(RW)
RW
RW
Modbus
register
number*
DV-1
DV-2
DV-3
DV-4
DV-5
DV-6
DV-7
DV-8
DV-9
DV-10
DV-11
DV-12
DV-13
DV-14
DV-15
DV-16
DV-17
DV-18
DV-19
DV-20
OPERATION
UnitsRange
Description
I-P units SI units I-P units SI units
--------
See Table 49-1,
Alarms menu
Continued
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OPERATION
Modbus, BACnet, LonTalk interoperability
Table 72-1:
GTS humidifier LX series interoperability variable and object names (continued)
21
24
25
28
29
32
33
36
37
BACnet
Object
Type and
Instance
BV-21 nvoAlrmBurner2
BV-24 nvoAlrmIgnitMod1
BV-25 nvoAlrmIgnitMod2
BV-28 nvoAlrmBlower1
BV-29 nvoAlrmBlower2
BV-32 nvoAlrmGasValve1
BV-33 nvoAlrmGasValve2
BV-36 nvoAlrmLowWater
BV-37 nvoAlrmFoaming2
LonTalk variable
names**
Variable name and
BACnet object name
Faults and alarms (continued)
Burner 2 faultRW
Ignition module 1 faultRW
Ignition module 2 faultRW
Blower 1 faultRW
Blower 2 faultRW
Gas valve 1 faultRW
Gas valve 2 faultRW
Low waterRW
Replace ignitors!RW
* See Note 1 on Page 73.
** See Note 2 on Page 73.
Read Only
(RO) or
Read Write
(RW)
Modbus
register
number*
DV-21
DV-24
DV-25
DV-28
DV-29
DV-32
DV-33
DV-36
DV-37
Description
See Table 49-1,
Alarms menu
UnitsRange
I-P units SI units I-P units SI units
--------
Continued
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
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Modbus, BACnet, LonTalk interoperability
Table 73-1:
GTS humidifier LX series interoperability variable and object names (continued)
38
39
40
41
42
43
44
45
46
47
48
49
50
60
BACnet
Object
Type and
Instance
BV-38 nvoMsgReplCntctr
BV-39 nvoMsgSrviceUnit
BV-40 nvoMsgDrainPend
BV-41 nvoMsgNoDuctAir
BV-42 nvoMsgIlockOpen
BV-43 nvoMsgFreezDrain
BV-44 nvoMsgEOSactive
BV-45 nvoMsgTempCompOn
BV-46 nvoMsgCleanProbe
BV-47 nvoMsgDuctHLtrip
BV-48 nvoMsgDuctHLspan
BV-49 nvoMsgH2Ocutout
BV-50 nvoMsgBoilTempCl
BV-60 nvoMsgMasterEnb
LonTalk variable
names**
Diagnostics menu
Variable name and
BACnet object name
Messages
Replace ignitors soonRW
Service unitRW
Drain pendingRW
No airflowRW
Interlock openRW
Freeze drainRW
End of season drain activeRW
Temp comp onRW
Clean probesRW
Duct HL tripRW
Duct HL spanRW
Insufficient water flowRW
Boiling temp calibratedRW
Master enable openRW
Notes:
1. Modbus Input Registers (IR1-IR44) 16 bit read only
Modbus Holding Registers (HR1-HR21) 16 bit read/write
Modbus Discrete Input Registers (DI1-DI7) single bit read only
Modbus Coil Registers (DV1-DV69) single bit read/write
2. nvi LonTalk SNVTs are write-only; nvo are read-only
Read Only
(RO) or
Read Write
(RW)
Modbus
register
number*
DV-38
DV-39
DV-40
DV-41
DV-42
DV-43
DV-44
DV-45
DV-46
DV-47
DV-48
DV-49
DV-50
DV-60
Description
See Table 65-1,
OPERATION
UnitsRange
I-P units SI units I-P units SI units
--------
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OPERATION
Multiple-tank operation
MULTI-TANK MODE DEFINED
In multi-tank mode, one Vapor-logic controller can control multiple humidifier tanks, and tanks in a multi-tank system can
vary by energy source and capacity.
A multi-tank system has one master controller controlling up to 8 slave tanks. The master controller receives the demand
signal and controls slave tank steam production based on
• priority group,
• wear leveling,
• fault status.
The master controller also gives permission to slave humidifier tanks to perform functions, such as draining and flushing.
The master controller must be
• field-wired to all required control input signals,
• connected to all slave tanks via the DriSteem fieldbus,
• powered during system operation.
MULTI-TANK CONTROL INTERFACE
Most systems have one Vapor-logic touchscreen per multi-tank group. This touchscreen ships with the tank that has the
master control board. The touchscreen (or the Web interface; see note below) can be connected to any humidifier in the
multi-tank group. Maximum cable length from the touchscreen to any control board in the multi-tank group is 500' (152
m).
Note: Multi-tank groups can also be operated using the Web interface. See “Multi-tank operation with Web interface”
on Page 78.
START-UP ORDER AND TRIM TANKS
All humidifier tanks in a multi-tank group are factory-assigned to a priority group. There are four priority groups: 0, 1, 2,
and 3.
Priority groups identify tank function as follows:
• 0 = Trim tanks 2 = Priority 2 tanks (peak)
• 1 = Priority 1 tanks (load) 3 = Redundant tank
• Priority groups identify start-up order:
Tanks in priority group 0 are brought online first, followed by tanks in priority group 1, then 2. Priority group 3
designates an optional redundant tank, which comes online only if a tank in the system is unavailable and the
remaining tanks cannot meet capacity.
• Trim tank responds first:
A trim tank is assigned to priority group 0 and is brought online first — always before tanks in priority groups 1, 2,
or 3. The trim tank modulates continuously, responding to system demand changes.
Multi-tank groups requiring a rapid response to changes in system demand typically have an electric element
humidifier with SSR control as the trim tank.
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Multiple-tank operation
OPERATION
TANK GROUPING TO MAXIMIZE EFFICIENCY
Priority 1 and priority 2 tanks can be grouped to improve efficiency. Tanks not
identified as trim or redundant tanks are factory-assigned to priority groups 1
and 2. Priority 1 tanks come online before priority 2 tanks. Because tanks in a
multi-tank system can vary by capacity, this allows tank grouping to maximize
efficiency, bringing tanks online in the order that best matches humidification
load to individual tank capacity.
EXAMPLE 1:
A large-capacity tank that meets humidification demand most days is
assigned to priority group 1.
Smaller-capacity tanks, needed only when additional capacity is needed,
are assigned to priority group 2.
EXAMPLE 2:
A gas-fired tank that meets humidification demand most days is assigned to
priority group 1.
Electric tanks, needed only when additional capacity is needed, are
assigned to priority group 2
Note: Wear leveling occurs only within a priority group.
REDUNDANT TANK FOR MISSION-CRITICAL APPLICATIONS
A redundant tank can be assigned for mission-critical applications. The system
capacity of a multi-tank group is the combined capacity of tanks in groups
0, 1, and 2. Placing a tank in priority group 3 ensures that it only runs as a
redundant tank. The redundant tank can be assigned to priority group 3 and
will operate only if one or more of the tanks in groups 0, 1, and 2 are not
available, and the remaining tanks in the multi-tank group cannot meet demand
for steam production.
Configuration tips
• Use priority groups 1 and 2 to group tanks
for maximum energy efficiency. For example,
put gas-fired tanks in group 1 and electric
tanks in group 2.
• Multiple small-capacity tanks usually operate
more efficiently than one large-capacity tank
meeting the same load requirement.
• Use priority groups 1 and 2 to group tanks
by capacity, bringing tanks online in the
order that best matches humidification load
to individual tank capacities.
• If your multi-tank system has a redundant
tank, configure that tank as the master
controller. This will reduce system down time
while the master controller tank receives
servicing. Since the redundant tank operates
the least in a multi-tank system, it is the tank
most likely to remain online.
• Match the capacity of the redundant tank
to the largest tank in the system to ensure
the system’s ability to meet maximum
humidification load when a tank goes offline.
See Note 1 in Table 76-1.
Note: For best performance, multiple electric humidifiers in a given priority
group must all have the same heater controls. That is, they should all be
100% SSR control, or all be sequenced SSR control, or all be contactor
control.
TANK WEAR LEVELING
The master controller monitors tank wear and assigns steam production to tanks
to equalize wear as much as possible within each priority group.
FAULT TOLERANCE
The master controller monitors tank status of all tanks in a multi-tank group
periodically. If a tank goes offline or is not communicating (“No comm”) for
a defined time period, the controller identifies that tank as unavailable and
the system responds using other available tanks. If the master controller stops
operating, the remaining slave tanks continue to run for a short time at the level
they were last run, and then quit.
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OPERATION
Multiple-tank operation
Table 76-1:
Multitank priority groups application example
Priority
group
Notes:
1. If protection is required against multiple tanks being offline at the same time, the redundant tank should be at least as large as the sum of the X
largest tanks where X is the number of tanks for which protection is desired.
2. From a fuel cost standpoint, electric should have the lowest priority. It should run last and the least.
3. From an energy standpoint, GTS generally has the lowest operating cost.
4. When calculating energy, consider heat loss from distribution and piping of steam.
5. Humidifiers within a priority group are load leveled.
6. Humidifiers within a group should have the same energy source.
AssignmentDescriptionApplication considerations
0Trim
1Load
2Peak
3Redundant
• Provides humidification load “throttling,” this unit sees the small changes as demand
changes.
• Generally, this should be one tank, and it should be relatively small.
• Generally, this tank should be an SSR-controlled electric resistive unit.
• Carries the bulk of the load; should be the most cost-effective fuel source.
• Only sees large-step changes if a trim tank is used.
• Makes up the demand not met by trim + load.
• Does not run often, because it is needed in only the most demanding situations.
• Because it does not run frequently (making fuel cost less of an issue), this is a good
assignment for a lower-up-front-cost humidifier.
• Run time is a function of load percentage split into the peak category.
• Provides the capability to offset a tank that is offline for any reason.
• This tank will only run when a trim, load, or peak unit is shut down for service or
alarm conditions and the remaining trim, load, and peak tanks cannot meet demand.
• The redundant should be as large as the largest tank in the system.
See Note 1 below.
• If a redundant tank is used, making it the master controller improves system uptime,
since you will not need to bring down the master controller to service it.
An SSR-controlled electric resistive
unit will provide the best control.
GTS is the most cost effective, but
any unit can be used.
Electric resistive are the most cost
effective (any unit can be used).
• Electric humidifiers are the most
cost-effective up front.
• Size should be the determining
factor.
• Any unit will work.
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Multiple-tank operation
OPERATION
WIRING A MULTI-TANK GROUP OF HUMIDIFIERS
To wire a multi-tank group of humidifiers:
1. Determine which control board is the master controller. The master
controller ships with the touchscreen display. The master controller is
labeled as Tank A on the touchscreen display and on the tank’s product
label.
2. Connect all required control inputs to the master controller board by
following the instructions in “Control input” on Page 12.
3. Wire all control boards of the multi-tank group together using twisted pair
wire.
• Important: DriSteem recommends using one pair of wires of a Cat-5 cable.
Do not use non-twisted two-conductor wire.
• Connect controller boards together at terminal block P8. Connect positive
to positive terminals, and negative to negative terminals. On the last board
in the series of connected boards, jumper the pins at J1001 (located on the
Vapor-logic board next to the RJ11 phone socket, see Page 5). On all other
boards, J1001 should not be shunted.
4. If you plan to use the Web interface, follow the wiring instructions in “Web
interface communication” on Page 21.
• Note: Each tank must be connected via Ethernet to a network system
for the Web interface to access all tanks in the multi-tank group.
Important:
All multi-tank communication must go
through the master controller to reach slave
tanks. Therefore, the touchscreen display
communication requires that power is supplied
to:
• The master controller (on Tank A)
• Any other tank that is hosting the display
5. Connect the touchscreen display cable to any control board in the
multi-tank system. The master tank must be powered for the display to
communicate.
MULTI-TANK SYSTEM SETUP
Factory configuration
Humidifier tanks ordered as a multi-tank group are configured at the factory.
The factory configuration process includes:
• Assigning letter names to tanks (Tank A, Tank B, .... Tank P).
Note: The master tank is always configured as Tank A.
• Assigning priority group numbers (0, 1, 2, 3)
• Configuring the controllers
Changing factory configuration
Change tank designation using the Web interface only. Go to the Web screen
Settings menu to access Multi-tank setup/Tank designator.
Important:
Any change made to or from the tank controller designated as “A” will cause
an approximate five-second delay while the board reboots. During this time the
Web interface display will not change.
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OPERATION
Multiple-tank operation
CHANGING A PRIORITY GROUP
To change a priority group, go to the Settings menu to access Multi-tank setup/
Tank priority group.
To add a tank to a multi-tank system:
1. Verify that the new tank has the correct tank designator. Change, if
necessary, before wiring in Step 2.
2. Connect wiring of new tank.
3. The master controller automatically adds the new tank’s capacity into the
total system capacity.
To permanently remove a tank from a multi-tank system:
1. Disconnect control board wiring (location P8) of the tank being removed.
2. Reset system capacity from the Multi-tank Settings menu. The controller will
automatically calculate the new system capacity.
Important:
• Each tank in a multi-tank system must have a unique tank designator (A, B,
C ... P). Duplicate tank designations will cause multi-tank mode to operate
incorrectly.
• Each Vapor-logic board ships with a network IP address of 192.168.1.195.
When installing on an Ethernet network, assign each board a unique IP
address to avoid conflict with other devices on the network.
OTHER SYSTEM PARAMETERS AND INTEROPERABILITY
General system parameters are set the same as for stand-alone tank/controller.
See the Setup section of this manual for instructions.
MULTI-TANK OPERATION WITH WEB INTERFACE
If you plan to use the Web interface for multi-tank operation, the web interface
must first be configured, see "Web interface communication" on Page 21.
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Multiple-tank operation
USING THE WEB INTERFACE
Additional Web interface screens, described below, appear when
operating in multi-tank mode.
This letter identifies which tank
(A ... P) you are viewing.
Each connected tank automatically
shows up as a link. Click on a tank
link to view its status.
Important: All system tanks must be
network-connected via Ethernet for
these links to function.
OPERATION
Click on the Setup tab
to view Multi-tank setup
parameters.
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TROUBLESHOOTING
Troubleshooting guide
SOLVING ISSUES
1. Review issues, possible causes and recommended actions.
The troubleshooting guide on the following pages presents issues, possible
causes and recommended actions for typical issues.
2. Review tank or dispersion manuals.
If you have a tank-related or dispersion-related issue, you may also need to
refer to those specific product manuals.
3. If you’re still having issues, call DriSteem.
If the troubleshooting guide does not help you solve your issue, call
DriSteem with the following information available:
• Product name and serial number
You’ll find this information on the humidifier or control cabinet.
• Issue definition
Example: water leaking, low humidity, high humidity, etc.
• Alerts Log items (if applicable)
Example: Tank temp, probe wiring, etc.
• Time issue began
Example: Always, after remodel, after a change in weather, etc.
• System changes
Example: Pressure, new boiler, new service, new controller, relocation,
change in maintenance, etc.
DriSteem Technical Support:
800-328-4447
CALLING DRISTEEM TECHNICAL SUPPORT
Have the following information ready before calling:
Vapor-logic firmware version __________________________________________
Humidifier model number _____________________________________________
Humidifier serial number ______________________________________________
• Reset control transformer circuit breaker if tripped.
• Reset thermal cutout if tripped.
• Low limit thermostat is not satisfied (outdoor
enclosure only).
• Check main line safety switches.
• Check heater fuses.
• Verify proper transformer voltage characteristics.
• Verify proper wiring of transformer.
• Check for control circuit voltage, 24 VAC. If
voltage is not present, check transformer circuit
breaker. Reset if needed.
P11. If voltage is low unplug all field wiring to
see if the voltage returns. Incorrect field wiring
on other terminals can draw down the voltage. If
voltage does not return, replace the Vapor-logic
board.
• Check cable from Vapor-logic to display is a
DriSteem supplied cable. Regular phone cables
will fit in the jack but will not allow voltage to the
display.
terminal cover.
and re-plug it back in to cycle power.
Continued
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
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TROUBLESHOOTING
Troubleshooting guide
Table 82-1:
Troubleshooting guide (continued)
IssuePossible causesActions
Alert:
Space RH signal out of range
Alert:
Dew point signal out of range
Alert:
Demand signal out of range
Alert:
Duct RH signal out of range
Alert:
Aux temp sens out of range
Transmitter or humidistat issues
Alert:
No SDU airflow
Alert:
Check water probe
Alert:
Faulty water probe
Water level control probe issues
When transmitter or humidistat alerts appear,
possible causes are:
• Open, shorted, or incorrect wiring
• Incorrect signal
• Ground loop
• Signal exceeds range limits. Correct input
signals are: 4-20 mA, or 0-16 VDC
• SDU blower or airflow proving switch is
incorrectly wired
• SDU blower cover is off• Install cover.
• SDU blower motor is inoperable (SDU fan does
not start)
• Breaker tripped• Reset breaker.
• Incorrect installation• Verify proper wiring of probe system. Do not use shielded
• Dirty or oxidized probes• Clean probe, removing oxidation and/or minerals or
• Deterioration of probe rod assembly• Replace probe rod assembly.
• Missing probe rod• Replace missing probe rod if possible; otherwise, replace
• Check the Control Input Signal type in the Settings/Control
menu. The selected type must match the actual sensor
hardware.
• Check voltages at board terminal P11:
-- RH signal: 2-10 VDC.
-- Dew point signal: 2-10 VDC.
-- Demand signal: 0-16 VDC.
• Check voltages at board terminal P13:
-- Duct high limit signal: 0-21 VDC, 2-10 VDC.
• Check voltages at board terminal P14:
-- Auxiliary temp sensor or temperature compensation
sensor: 2-10 VDC.
• Check output on transmitter:
-- If there is no output, replace transmitter.
-- Verify output is 4-20 mA.
-- Calibrate transmitter or humidistat if necessary.
• Check 21 VDC voltage supply of the board at P11. If
voltage is low unplug all field wiring to see if the voltage
returns. Incorrect field wiring on other terminals can draw
down the voltage. If voltage does not return, replace the
Vapor-logic board.
• Isolation control board by others may not be compatible.
Consult DriSteem.
• Check SDU for proper wiring.
• Replace SDU blower.
(screened) wiring.
• Verify probe wiring is not routed with high voltage wiring.
• Verify wiring between control cabinet and humidifier does
not exceed the recommended 50' (15 m) limit.
(Remote mount cabinets only)
• Verify fill and drain plumbing was installed per the
instructions in the humidifier's manual.
• Verify piping from the humidifier to the dispersion assembly
is installed correctly, that there are no elbows or restrictions
in the piping, and that the length of the piping is not too
long. See instructions in the humidifier's manual.
• Verify there is a P-trap installed on the tank and/or that the
P-trap is not plugged.
• Verify that there is a machine ground between control
cabinet and humidifier tank.
replace if needed.
• Drain tank water to below the probe; reset system and
restart.
probe assembly.
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Troubleshooting guide
Table 83-1:
Troubleshooting guide (continued)
IssuePossible causesActions
Alert:
Excessive fill time
Alert:
Excessive refill time
Filling issues
Tank is not full.
• Fill and drain valve wiring reversed• Correct wiring.
• Low water supply pressure • Verify water pressure is 25 psi (552 kPa) minimum.
• Verify interlock switch is set correctly and humidifier cover is on.
• Reset over-temperature thermostat if tripped.
• Check for proper water level in tank.
• Clean or adjust as appropriate. See tank manual for instructions.
• Reset thermostat switch.
• Humidifier cover not wired; adjust interlock switch.
• Verify proper transformer voltage characteristics.
• Verify proper wiring of transformer.
• Check for control circuit voltage on electrical diagram. If voltage
is not present, troubleshoot boards and wiring system for
potential short circuit.
• Check main line fuse.
• Check main line safety switch.
• Check heater fuses and wiring diagram.
• Verify operation of duct high limit switch or transmitter.
• Check for miswired connection.
• Verify in the Settings menu that humidifier is configured for
demand signal.
temperature within range of 40 ºF to 180 ºF (4 ºC to 82 ºC).
• Readjust aquastat temperature to a lower set point.
Continued
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Troubleshooting guide
Table 87-1:
Troubleshooting guide (continued)
IssuePossible causesActions
Humidity is below desired
level
Humidity set point issues
• Unit is operating but fails to meet required
humidity level
• No call for humidity from humidistat or from
control and high limit humidity transmitters
• Excessive outside air volume• Verify proper operation of fans, dampers, VAV systems, etc.
• Humidity control input type not the same as
Vapor-logicfirmware
• Vapor-logic
• Unit undersized; replace with a larger unit or add additional
humidifier.
• Skim duration is too long.
• If drain valve does not close fully, determine the cause and
clean, repair, or replace as needed.
• If drain pipe water seal is allowing steam to go down the
drain, fill P-trap with water or repair as needed.
• If there is an improper water seal height, increase to the
recommended height (see humidifier tank manual for water
seal height).
• If there is excessive internal steam pressure, determine the
cause of the high pressure (e.g., high duct static pressure,
undersized orifices in dispersion tubes, water, or crushed
vapor hose) and correct as required.
• Replace leaking gasket or vapor hose.
• Recalibrate if controls are out of calibration.
• If fill valve is stuck open, repair or replace.
• If zone valve will not open, repair or replace.
• Interconnecting steam piping to the dispersion assembly is too
long and/or uninsulated (do not insulate steam hose).
• Low or no signal strength from humidistat. Check for proper
wiring.
• Check humidity transmitters (4 to 20 mA output).
• Adjust set point if RH or dew point set point is too low.
• Check Vapor-logiccontrol board connections P11 and P13.
Consult DriSteem.
not in Auto mode• Change mode to Auto.
TROUBLESHOOTING
Continued
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TROUBLESHOOTING
Troubleshooting guide
Table 88-1:
Troubleshooting guide (continued)
IssuePossible causesActions
Humidity above set point• High entering relative humidity• Dehumidify.
• Unit oversized• Consult DriSteem.
• Reduced airflow• Check fans, dampers, VAV systems, etc.
Hunting (humidity swings
above and below desired set
point)
Humidity set point issues
• Improperly located humidistat or humidity
transmitters
• Malfunctioning controls• Check for incorrect supply voltage.
• Malfunctioning control system• If there is a faulty or inaccurate humidity controller or
• Air volume varies rapidly• Stabilize.
• Air temperature is varying rapidly• Stabilize to ±1 ºF (±1 ºC).
• Proportional band is too small and/or
integral gain (Ki) is too large
• On-off control is not adequate• If controlling the humidifier with an on-off signal, consider
• Relocate, using guidelines in Appendix section of this manual.
• Check for incorrect control signal.
• Check for improper wiring hookup.
• If humidity controller or transmitter are out of calibration or
• Check for proper Vapor-logic
• Relocate poorly located control components. See “Sensor
• Verify that the touchscreen display modular cable is isolated
• If RH swings outside PID band, increase PID band using the
• Decrease integral gain (Ki) using the Set Up menu.
malfunctioning, repair or recalibrate.
transmitter, repair or replace.
control settings: RH set point,
high limit set point, cycle rate, PID tuning, etc.
placement” on Page 26.
from power wiring.
Settings menu.
changing to controlling with a modulating signal.
Continued
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TROUBLESHOOTING
Troubleshooting guide
Table 89-1:
Troubleshooting guide (continued)
IssuePossible causesActions
Alert: Blocked flue• Blocked flue sensor is open• Check venting system for obstructions.
• Check air line to flue switch for obstructions.
• Windy conditions cause downdrafts in venting system. Install
a high wind vent cap or isolate as recommended by local
codes.
Alert: Gas valve [number]
fault
Alert: Burner [number] fault• No gas supply to unit• Verify that gas service valve is on and receiving minimum
Alert:
Ignition module [number] fault
Alert:
Blower [number] fault
Alert:
No power vent airflow
Gas-to-steam (GTS) humidifier issues
Alert:
Flue temperature switch
Alert:
Tank temperature switch
Alert:
Flue or tank overtemp cutout
Alert:
Flue sensor out of range
• Failed ignition module
• Miswired gas valve
• Gas valve is off or there is no power to the
valve
• Gas valve outlet pressure is too low• Verify outlet pressure is set per rating plate.
• Blower inlet is dirty or obstructed• Clean inlet and check for obstructions.
• Flame sensor not sensing flame• Check flame sensor wiring.
• Polarity reversed at power block• Check polarity.
• Ignition sequence engaged without power to
gas valve
• Gas valve/ignite/sensing electrode is out of
sequence
• The blower is incorrectly wired, or the
blower failed to meet demand speed
• The power venter air flow switch is open• Check for proper power vent wiring.
• Flue temperature is too high
• Tank is not full
• Flue temperature is too high
• Tank is not full
• Flue temperature is too high
• Excessive inlet water temperature (over
90°F [32°C]).
• Tank is not full• Check if water supply line strainer is plugged.
• Excessive scale for tank and heat
exchanger
• Signal outside of 4-20mA• Check P4 voltage from CS1 to ground (2-10vdc)
• Check ignition module. Replace if necessary.
• Check gas valve wiring.
pressure to manifold per rating plate.
• Check for 24 VAC from the ignition module to the gas valve.
• Check that gas valve plug is seated properly.
• Check polarity at incoming power. Switch if necessary.
• Stray fiber from burner touching flame sensor. Use a
screwdriver to gently push down fibers near flame sensor.
• Flame sensor is cracked. Replace.
• Verify ignition sequence.
• Replace ignition module.
• Verify wire connections to gas valve, ignitor, and flame
sensing rod.
• Check for proper blower wiring.
• Replace blower.
• Repair or replace power venter.
• Unit automatically shuts off and cools down. The unit will
automatically restart when flue temperatures return to
normal.
• Excessive inlet water temperature (over 90°F [32°C]).
• Check if water supply line strainer is plugged.
• Clean scale from tank and heat exchanger.
• Check supply water pressure. Provide supply water pressure
as specified on unit.
• Unit automatically shuts off and cools down. The unit will
automatically restart when flue temperatures return to
normal.
• Check supply water pressure. Provide supply water pressure
as specified on unit.
• Clean scale from tank and heat exchanger.
• Replace transmitter if no voltage output
• Check voltage on P6 from 21vdc to ground is 21vdc. If not,
re-check terminals for all field connections.
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
89
Page 94
REPLACEMENT PARTS
Replacement parts
Table 90-1:
Vapor-logic replacement parts
DescriptionQuantityPart number
Kit (includes main controller and required Molex plugs)1183504-004
Touchscreen display - GTS LX series only1183508-001
Touchscreen display communication cable (contact DriSteem for lengths other than
27" (686 mm) and 60" (1524 mm)
Grip elastomeric touchscreen display1408494-023
Molex connector plug, 2-position1406246-002
Molex connector plug, 3-position1406246-003
Molex connector plug, 4-position1406246-004
LonTalk card1408642
FIGURE 90-1: VAPOR-LOGIC REPLACEMENT PARTS
27" (686 mm)408490-014
60" (1524 mm)408490-009
Main boardTouchscreen display
Molex connector plug (2-position shown)
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
90
LonTalk card
Page 95
Notes
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
91
Page 96
WARRANTY
Expect quality from the industry leader
Since 1965, DriSteem has led the industry with
innovative methods for humidifying and cooling
air with precise control. Our focus on ease
of ownership is evident in the design of the
Vapor-logic controller. DriSteem also leads the
industry with a Two-year Limited Warranty and
optional extended warranty.
For more information
www.dristeem.com
sales@dristeem.com
For the most recent product information
visit our Web site: www.dristeem.com
DRI-STEEM Corporation
a subsidiary of Research Products Corporation
DriSteem U.S. operations are ISO 9001:2015
certified
U.S. Headquarters:
14949 Technology Drive
Eden Prairie, MN 55344
800-328-4447 or 952-949-2415
952-229-3200 (fax)
European office:
Grote Hellekensstraat 54 b
B-3520 Zonhoven
Belgium
+3211823595
E-mail: dristeem-europe@dristeem.com
Continuous product improvement is a policy of
DriSteem; therefore, product features and
specifications are subject to change without
notice.
DriSteem, Vaporstream, Vapormist, and
Vapor-logic are registered trademarks of
Research Products Corporation and are filed
for trademark registration in Canada and the
European community.
Product and corporate names used in this
document may be trademarks or registered
trademarks. They are used for explanation only
without intent to infringe.
Two-year Limited Warranty
DRI-STEEM Corporation (“DriSteem”) warrants to the original user that its products will be free from
defects in materials and workmanship for a period of two (2) years after installation or twentyseven (27) months from the date DriSteem ships such product, whichever date is the earlier.
If any DriSteem product is found to be defective in material or workmanship during the applicable
warranty period, DriSteem’s entire liability, and the purchaser’s sole and exclusive remedy,
shall be the repair or replacement of the defective product, or the refund of the purchase price,
at DriSteem’s election. DriSteem shall not be liable for any costs or expenses, whether direct
or indirect, associated with the installation, removal or reinstallation of any defective product.
Excluded from the Limited Warranty are all consumable and wear and tear items such as cylinders,
membranes, filters, or media replacements. These items are subject to usual wear and tear during
usage.
DriSteem’s Limited Warranty shall not be effective or actionable unless there is compliance with
all installation and operating instructions furnished by DriSteem, or if the products have been
modified or altered without the written consent of DriSteem, or if such products have been subject
to accident, misuse, mishandling, tampering, negligence or improper maintenance. Any warranty
claim must be submitted to DriSteem in writing within the stated warranty period. Defective
parts may be required to be returned to DriSteem. Excluded from the Limited Warranty are all
consumable and wear and tear items such as cylinders, membranes, filters, or media replacements.
These items are subject to usual wear and tear during usage.
DriSteem’s Limited Warranty is made in lieu of, and DriSteem disclaims all other warranties,
whether express or implied, including but not limited to any IMPLIED WARRANTY OF
MERCHANTABILITY, ANY IMPLIED WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE, any
implied warranty arising out of a course of dealing or of performance, custom or usage of trade.
DriSteem SHALL NOT, UNDER ANY CIRCUMSTANCES BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
TO, LOSS OF PROFITS, REVENUE OR BUSINESS) OR DAMAGE OR INJURY TO PERSONS OR
PROPERTY IN ANY WAY RELATED TO THE MANUFACTURE OR THE USE OF ITS PRODUCTS. The
exclusion applies regardless of whether such damages are sought based on breach of warranty,
breach of contract, negligence, strict liability in tort, or any other legal theory, even if DriSteem has
notice of the possibility of such damages.
By purchasing DriSteem’s products, the purchaser agrees to the terms and conditions of this Limited
Warranty.
Extended warranty
The original user may extend the term of the DriSteem Limited Warranty for a limited number of
months past the initial applicable warranty period and term provided in the first paragraph of this
Limited Warranty. All the terms and conditions of the Limited Warranty during the initial applicable
warranty period and term shall apply during any extended term. An extended warranty term of
an additional twelve (12) months or twenty four (24) months of coverage may be purchased. The
extended warranty term may be purchased until eighteen (18) months after the product is shipped,
after which time no extended warranties are available. When a Dristeem humidifier is purchased
with a DriSteem RO system, an extended twenty-four (24) month coverage is included.
Any extension of the Limited Warranty under this program must be in writing, signed by DriSteem,
and paid for in full by the purchaser.