DriSteem VAPOR-LOGIC Version 6 Installation And Operation Manual

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READ AND SAVE THESE INSTRUCTIONS
VAPOR-LOGIC® VERSION 6
Humidifier Control System
Installation and Operation Manual
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Table of contents
DriSteem® Technical Support
800-328-4447
WARNINGS AND CAUTIONS ..................................................
OVERVIEW.................................................................1
Vapor-logic capabilities ....................................1
Humidification system overview ...............................3
Vapor-logic board ........................................4
Display ................................................6
Web interface ...........................................7
INSTALLATION ..............................................................8
Pre-installation Checklist ....................................8
Installation process ......................................10
Step 1 – Field wiring: ....................................12
Control input ........................................12
Control input signals ..................................14
Limit controls ........................................16
Vapor-logic display ...................................19
Communication connections .............................19
Field wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Sensor placement ....................................26
Step 2 – Setup .........................................28
Using the touchscreen display ............................28
Using the Web interface ................................29
Setup screen ........................................29
Step 3 – Startup ........................................37
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OPERATION ..............................................................38
Using menus and screens ...............................38
Vapor-logic display has the following menus and screens: ........38
Home screen (touchscreen display) ........................39
Changing mode and set point ............................39
Tank activities defined .................................39
Status screen ...........................................40
System alerts ...........................................44
Status LED (Vapor-logic control board) .........................48
Status LED (Touchscreen) ..................................50
PID tuning .............................................51
Improves humidifier response time .........................51
The proportional term ..................................51
The integral term .....................................52
The derivative term ...................................53
PID band ..........................................53
PID setup tips .......................................54
Universal water level control ................................55
Automatic drain sequence, all water types ......................56
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Table of contents
Options and features .....................................57
Duct high limit switch option .............................57
Modulating high limit transmitter option .....................57
Temperature compensation control option ....................58
Auxiliary temperature sensor option ........................58
Tank preheat feature ..................................58
Aquastat set point feature ...............................59
Freeze protection .....................................59
Fan-based dispersion operation ...........................59
Sensor offsets .......................................60
Skim timer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
End-of-season drain ...................................60
Service interval ......................................60
Setting date and time ..................................61
Battery backup, nonvolatile memory .......................61
Security/password ....................................61
Downloading historical data .............................62
Backing up and restoring settings .........................62
Firmware updates .......................................63
Downloading firmware updates. . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Installing firmware updates ..............................66
Test outputs and test run ...................................67
Modbus, BACnet, LonTalk interoperability ......................68
Connections ........................................68
Installing LonTalk as a retrofit ............................68
Multiple-tank operation ....................................78
Multi-tank mode defined ................................78
Multi-tank control interface ..............................78
Start-up order and trim tanks .............................78
Tank grouping to maximize efficiency ......................79
Redundant tank for mission-critical applications ................79
Tank wear leveling ....................................79
Fault tolerance .......................................79
Wiring a multi-tank group of humidifiers .....................81
Multi-tank system setup .................................81
Changing a priority group ..............................82
Other system parameters and interoperability .................82
Multi-tank operation with Web interface .....................82
TROUBLESHOOTING........................................................84
Troubleshooting guide ....................................84
REPLACEMENT PARTS ....................................................... 94
WARRANTY .............................................................. 96
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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.
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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 >
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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.
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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
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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.
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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
(24vac input)
P4: Isw = Interlock switch (24vac input) TT = Tank temp sensor (RTD input)
= Ground for tank temp sensor
CS1 = Flue temp sensor
P5: GV2 = Gas valve 2 (24vac input) BT2 = Blower tach 2 (pulse tach
input)
P6: 21vdc = 21vdc CS2 = Analog input (4-20 mA)/
Drain temp sensor
Connection pins for optional LonTalk module
24VAC
P1
P2
TOP MID LOW
P3
FPsw LW BT1 GV1
P4
CS1 TT lsw
P5
BT3 GV3 BT2 GV2CS2 21VDC BT4 GV4
Water probe LEDs
Status LED
Power vent switch jumper
J1101
USB port
Combust air switch jumper
Ethernet connection to laptop
computer, network, or BACnet IP
P6
RS485 termination for multi-tank
Vapor-logic touchscreen display connection
J1001
FIELDBUS = Modbus or BACnet MS/TP (RS485)
CPU LED
+ —
FIELDBUS
J404
J403
P7
P9
+ —
MULTI-TANK
(RS485)
P8
P19
P18
P17
P16
P15
P14
P13
P12
P11
P20
MASTER ENB
(Master enable/disable)
P19:
= Ground for blower or steam valve
SSR/BL = All blowers
+ —
SSR / BL STEAM
P18: (all are 24VAC outputs) CT4 = GTS LX refill valve CT2 = Ignition module 2
CT2 CT3 CT4FILL DRAIN CT1
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.
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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.
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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.
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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
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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.
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Pre-installation Checklist
P1
P2
P3
P4
P5
P6
P7
P8
P9
P10
P17
P18
P19
SSR/BL Steam
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
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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
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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.
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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.
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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
P11 P11 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
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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.
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Step 1 – Field wiring: Limit controls
FIGURE 17-1: VAPOR-LOGIC LIMIT CONTROLS WIRING CONNECTIONS Note:
An airflow switch must be used in any duct
Airow switch in a duct When using an SDU
Vapor-logic
Vapor-logic
P13
24VAC
24VAC
Com
NO
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
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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
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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.
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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 pair Twisted pair
Previous multitank humidifier
Protocessor module (optional)
A
B
LonTalk terminals
Next multitank humidifier
Twisted pair
Next LonTalk device
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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
Page 29
Step 1 – Field wiring
FIGURE 25-1: VAPOR-LOGIC PROGRAMMABLE RELAY WIRING CONNECTIONS FIGURE 25-2: TERMINAL P15
Vapor-logic relay #1 Vapor-logic relay #2
Normally open #1
Common #1
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)
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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.
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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 item Default 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 Setpoint 35 0 100 %
RH Offset 0 -20 20 %
PID tuning -- -- -- --
PID band 10 0 50 %
Proportional gain 80 0 1000 --
Integral gain 40 0 1000 --
Derivative gain 0 0 1000 --
VDC Demand -- -- -- --
VDC Settings -- -- -- --
0% output (VDC) 1.0 0.0 Maximum VDC
100% output (VDC) 9.0 Minimum 16.0 VDC
mA Demand -- -- -- -- Current signal by others
mA Settings -- -- -- --
0% output (mA) 4.0 0.0 Maximum mA
100% output (mA) 20.0 Minimum 20.0 mA
Fieldbus -- -- -- --
(See Communications settings) -- -- -- --
Humidistat -- -- -- -- On-off humidistat
Duct RH Limit
Limit Type Switch -- -- --
Switch -- -- -- -- Humidistat (switch) installed in duct
Transmitter -- -- -- -- Humidity sensor installed in duct
High Limit Settings -- -- -- --
Duct HL Setpoint 80 5 95 %
Duct HL Span 6 0 20 %
Duct HL Offset 0 -20 20 %
Not Used -- -- -- --
Minimum
value
Maximum value Units Notes
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 item Default value
Fan Dispersion
Fan Type -- -- -- --
Space Distribution Unit
Fan Off Delay 5 1 30 Minutes
Area-Type Fan -- -- -- --
Auxiliary Temperature Sensor
Purpose Not Used -- -- --
Temperature Compensation
Sensor Offset
Temperature Monitoring
Sensor Offset
Not Used -- -- -- --
Programmable Outputs
Dry Contact 1 or 2 -- -- -- --
Contact Behavior
Contact Purpose Default Alerts -- -- --
Default Alerts
View Default Alerts
Selected Alerts
Alert selection
Alert on Low RH -- -- -- --
Alert below RH 50 0 100 --
Steam Yes/No -- -- -- --
Heat On/Off -- -- -- -- A dry contact activates when the humidifier is heating.
Not Used -- -- -- --
-- -- -- --
-- -- -- --
0 -20 20 °F
0 -11 11 °C
-- -- -- --
0 -20 20 °F
0 -11 11 °C
Normally
open
-- -- -- --
-- -- -- --
Minimum
value
Normally
open
Maximum
value
Normally
closed
Units Notes
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 item Default value
Water Management
Automatic Drain Sequence -- -- -- --
Drain Interval Choice
Draining Disabled -- -- -- --
Smart Drain -- -- -- --
Static Drain -- -- -- --
Allowed Drain Times -- -- -- --
Restrict Hour to Drain Yes -- -- --
Hour to Drain 0 (12 AM) 0 23 Hours
Allowed Days All -- -- --
Sunday Yes -- -- --
Monday Ye s -- -- --
Tuesday Yes -- -- --
Wednesday Yes -- -- --
Thursday Yes -- -- --
Friday Yes -- -- --
Saturday Yes -- -- --
Static Drain Settings Model-specific
Drain Duration Model-specific 0 120 Minutes
Flush Duration Model-specific 0 15 Minutes
Skim -- -- -- --
Skim Feature Enabled -- -- --
Skim Duration Model-specific 0 120 Seconds
End of Season -- -- -- --
End of Season Drain Enabled -- -- --
Idle Time Before Drain 72 1 336 Hours
Smart Drain
Minimum
value
-- -- --
0 2,200,000 lbs
0 1,000,000 kg
Maximum
value
Units Notes
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 item Default value
Aquastat -- -- -- --
Aquastat Feature Enabled -- -- --
Aquastat Setpoint
Service Interval -- -- -- --
Service Interval Model-specific 0 2,200,000 lbs
Service Interval Model-specific -- 1,000,000 kg
Fill Fault Time-Out -- -- -- --
Fill Fault Time-Out 40 10 250 Minutes Amount of fill time before an alert will occur.
Drain Tempering -- -- -- --
Drain Tempering Feature Enabled Disabled Enabled --
Drain Valve
Test
Test Outputs -- -- -- --
Fill Valve 5 5 5 Seconds
Pulse Fill Valve(s) 5 5 5 Seconds
Drain Valve 10 10 10 Seconds
Fan Control 5 5 5 Seconds
Ignition Module 1 or 2 8 8 8 Seconds
Blower Speed Control 10 10 10 Seconds
Dry Contact 1 or 2 5 5 5 Seconds
Test Run -- -- -- --
Test Run Percent 100 0 100 %
Test Run Time 5 1 30 Minutes
Start/Stop Test Run -- Start Stop --
Communications
IP Addressing -- -- -- --
IP Address 192.168.1.195 0.0.0.0 255.255.255.255 --
IP Mask 255.255.255.0 0.0.0.0 255.255.255.255 --
Gateway 192.168.1.1 0.0.0.0 255.255.255.255 --
Auto Obtain Address No -- -- --
50 40 180 °F
10 4 82 °C
Normally
Closed
Minimum
value
Normally
Closed
Maximum value Units Notes
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 item Default value
Communication Type Modbus -- -- --
BACnet MS/TP -- -- -- --
Comm Channel 38400 19200 76800 --
BACnet MS/TP Settings
Device Instance 255 0 4194303 --
Max Masters 127 1 127 --
MAC Address 1 0 127 --
Max Info Frames 1 1 127 --
BACnet IP -- -- -- --
Device Instance 255 0 4194303 --
UDP port (47808) 47808 1024 65535 --
Modbus -- -- -- --
Modbus Baud Rate 19200 4800 38400 --
-- -- -- --
Minimum
value
Maximum value Units Notes
INSTALLATION
Modbus Address 99 0 255 --
LonTalk -- -- -- --
Display
Date and Time -- -- -- --
Set Date 1999 -- -- --
Set Time 0:00 0:00 23:59 -- 24 hour clock
Humidifier Info -- -- -- --
Press the edit icon to edit the name of the
Unit Name order-specific 1 20 Characters
Model order-specific -- -- -- Displays humidifier model
Serial Number order-specific -- -- -- Displays humidifier serial number
Factory String order-specific -- -- -- Displays as-shipped configuration
Current String -- -- -- -- Display current configuration string
Firmware Version -- -- -- --
Display Version -- -- -- --
Language English -- -- --
English -- -- -- --
humidifier. This name is not communicated by BACnet, LonTalk or Modbus.
Displays current firmware version of Vapor-logic control board and date of firmware release.
Displays current firmware version of board internal to touch screen display and date of firmware release
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INSTALLATION
Step 2 – Setup
Table 30-1: Settings menu (continued)
Menu item Default value
Units inch-pound -- -- --
inch-pound -- -- -- --
SI units -- -- -- --
Idle Time-Out -- -- -- --
Idle Time-Out 5 1 120 Minutes
Brightness -- -- -- --
Adjust Brightness 60 10 100 % Use 100% brightness outdoors.
Clean Screen 30 30 30 Seconds
Capacity Calibration -- -- -- --
Capacity Calibration 100 0 245 %
Security
Require Passcode No No Yes --
Set Passcode 0000 0000 9999 --
Passcode Time-Out 5 1 120 Minutes
Backup / Restore Settings
Backup to USB -- -- -- --
Restore from USB -- -- -- --
Reset to Defaults -- -- -- --
Reset to Defaults -- -- -- --
Reset Ignition Counts -- -- -- -- Select this if you want to reset the GTS ignitor counts
Minimum
value
Maximum value Units Notes
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: STATUS FIGURE 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 item Default value
Mode Standby -- -- --
Space RH -- 0 100 %
RH set point 35 0 100 %
-- 0 10 VDC
Input signal
-- 0 20 mA
-- 0 100 °F
Dew point
-- -17 37 °C
50 20 80 °F
Dew point set point
10 -6 26 °C
Inlet pressure switch -- No water Water --
Steam demand -- 0 100 % Displays steam demand as a percent of capacity
Steam output -- 0 100 % Displays steam output as a percent of capacity
-- 0 100,000 lbs/hr
Steam production
-- 0 100,000 kg/h
Duct RH -- 0 100 %
Duct HL switch -- Open Closed --
Duct HL set point 80 5 95 %
Duct HL signal -- 0 20 mA
-- -30 275 °F
Tank temperature
-- -34 135 °C
Tank temp signal -- 0 2200 Ohms
-- -20 160 °F
Aux temperature
-- -29 71 °C
Aux temp signal -- 0 26 mA
Minimum
value
Maximum
value
Units Notes
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
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OPERATION
Status screen
Table 41-1: Status screen (continued)
Menu item Default value
Board voltage 24 0 30 VAC
Board temp -- 0 200 °F
High probe signal -- 0 14000 counts
High water probe -- Water No water --
Mid probe signal -- 0 14000 counts
Mid water probe -- Water No water --
Low probe signal -- 0 14000 counts
Low water probe -- Water No water --
Airflow switch -- Flow No flow --
Interlock switch -- Open Closed --
Water until drain/flush
Water until service
Blower 1 tach -- 0 7000 rpm Displays rotation speed of Blower 1
Blower 2 tach -- 0 7000 rpm Displays rotation speed of Blower 2
Gas valve 1 -- Open Closed --
Gas valve 2 -- Open Closed --
-- -- 2,200,000 lbs
-- -- 1,000,000 kg
-- -- 2,200,000 lbs
-- -- 1,000,000 kg
Minimum
value
Maximum
value
Units Notes
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 item Default value
Combust air switch -- Flow No Flow --
Power vent switch -- Open Closed --
Flue pressure switch -- Open Closed --
Flue temperature
Drain temperature
Temperature switches -- Open Closed -- For flue and tank temperature
-- 32 212 °F
-- 0 100 °C
-- 32 212 °F
Minimum
value
0 100 °C
Maximum
value
Units Notes
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 label Description
Red Alerts
Tank temp sensor failed Tank 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 probe Water probe head is dirty, faulty, or miswired. Yes
Faulty water probe Water probe readings are suspect, likely caused by scale on probe. No
Excess fill time Fill valve has been on too long during initial tank fill. Bottom probe is not in contact with water. Ye s
Excess refill time Re-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 fault Blower is turning at less than the specified minimum RPM. Unit not allowed to run. Yes
Gas valve 1 or 2 fault Gas 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 label Description
Flue or tank over-temp cutout
Flue sensor out of range Flue temperature sensor signal is out of range. Yes
Drain sensor out of range Drain temperature sensor signal is out of range. Yes
Yellow Alerts
No airflow No duct airflow. Yes
I-lock open Interlock safety switch is open. Yes
Freeze drain Tank 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 probes Water level control probes need cleaning. Check tank for cleaning. No
Duct HL trip Duct relative humidity has risen above the high limit set point, or high limit switch has opened. Yes
Insufficient water The low water probe is not in contact with water when there is a demand for humidity. Yes
Master enable open Indicates 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 temp The drain temperature has exceeded 145 °F (63 °C) for at least one minute Yes
Excessive foaming
Aux temp sense out of range Auxiliary temp sensor signal is out of range. Yes
White Alerts
Service unit Regularly scheduled unit servicing is due. No
Drain pending Auto 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 Blink Second Blink Third Blink
LED Indicator
Faults Communications status Demand/call for humidification
OPERATION
Green Auto 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 Indicator Mode Demand/call for humidification
Green Auto mode: no faults Humidification demand is present
Yellow Auto mode: active alert preventing unit from running
Red Auto mode: active fault preventing unit from running
Blue Standby mode or auto mode No 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 AM 23 0 212 567019018 421066 23
1/26/10 9:37 AM 23 0 212 567021350 421068 23
1/26/10 9:38 AM 23 0 211 567023681 421070 23
1/26/10 9:39 AM
1/26/10 9:40 AM 23 0 210 567028344 421073 23
1/26/10 9:41 AM 23 0 211 567030677 421075 23
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 AM 23 0 212 567033008 421077 23
1/26/10 9:43 AM 23 0 212 567035339 421079 23
1/26/10 9:44 AM Unit 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.
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OPERATION
Firmware updates
Table 62-1: Downloading Vapor-logic firmware updates
1. Click the link shown to the right on the Vapor-logic firmware updates page of
www.dristeem.com.
If a security window appears, click the Save button.
Note: Your browser and operating system might be set up differently, the
screenshots are provided as a general road map.
2. When prompted for a save location, choose your desktop.
3. Click the Save button.
4. On your desktop, double-click the new vl6_update.exe file.
5. If a Security Warning appears, click the Run button.
A WinZip Self-Extractor window appears.
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Firmware updates
Table 62-1: Downloading Vapor-logic firmware updates (continued)
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 item Default value
Minimum
value
Maximum
value
Units Description
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 0 0 100 % Set demand percent value between 0 and 100 to test.
Test run time 0 0 30 minutes Set 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- 1 nvoSteamOutMass
AV- 2 nvoSteamOutputP
AV- 3 nvoWaterUntilADS
AV- 4 nvoWaterTilSrvc
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_RH RO
Space_dew_point RO
Duct_RH RO
Steam_demand_mass RO
Steam_demand_percent RO
Aux_temp RO
Water_temp RO
Steam_output_mass RO
Steam_output_percent RO
Water_until_ADS RO
Water_until_service RO
* 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
Units Range
I-P units SI units I-P units SI units
% % 0 to 100 0 to 100
ºF ºC 20 to 80 -6 to 26
% % 0 to 100 0 to 100
lbs/hr kg/h
% % 0 to 100 0 to 100
ºF ºC -20 to 160 -29 to 170
ºF ºC
lbs/hr kg/h
% & 0 to 100 0 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_hr RO
MT_sys_output_pcnt RO
Setup variables
Run_mode
Space_RH_set_point Write
Space_dew_point_set_point Write
Duct_high_limit_set_point Write
* 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-08 nvoMT_SteamOMass
AI-09 nvoMT_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
Units Range
I-P units SI units I-P units SI units
lbs/hr kg/h
% % 0 to 100 0 to 100
-- -- 1 to 4 1 to 4
-- -- 1 to 6 1 to 6
% % 0 to 100 0 to 100
ºF ºC 20 to 80 -6 to 26
% % 0 to 100 0 to 100
0 to
100000
0 to
100000
Continued
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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_band RW
PID-Kp RW
PID-Ki RW
PID-Kd RW
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 nciPIDband PID band. % % 0 to 50 0 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
Units Range
I-P units SI units I-P units SI units
lbs/hr kg/h
% % 0 to 100 0 to 100
-- --
-- --
-- --
-- -- 1 to 2 1 to 2
-- -- 1 to 2 1 to 2
lbs/hr kg/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
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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_switch RO
Duct_HL_switch RO
Safety_interlock RO
Combustion_air_damper_ RO
Flue_pressure_switch RO
Power_vent_switch_ RO
Fill_valve RO
Drain_valve RO
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-01 nvoAirflowSwitch 0=Open; 1=Closed
BI-02 nvoDuctHLswitch 0=Open; 1=Closed
BI-03 nvoSafetyI-lock 0=Open; 1=Closed
BI-04 nvoCombustAirDmp
BI-05 nvoFluePressurSw 0=Open; 1=Closed
BI-06 nvoPowerVentSwch
BO-01 nvoFillValve 0=Closed; 1=Open
BO-02 nvoDrainValve
BI-08 nvoMt_AlarmSomWr 0=No; 1=Yes Multi-tank only
BI-09 nvoMt_MsgSomWr 0=No; 1=Yes Multi-tank only
LonTalk variable
names**
0=Damper Closed; 1=Damper Open
0=Vent Off; 1=Vent On
0=Not Draining; 1=Draining
Units Range
Description
I-P units SI units I-P units SI units
-- -- -- --
Continued
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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_status RO
ProgOutput2_status RO
Active manual clear alarms exit RO
Clear all active alarms RW
Tank temp sensor failed RW
Tank overtemp, Unit reboot required
Signal at RH input out of range RW
Duct RH sig out of range RW
Aux temp sense out of range RW
Check water probe RW
Faulty water probe RW
Excessive fill time RW
Excessive refill time RW
Tank not draining RW
Excessive boil time, Unit reboot required
No SDU airflow RW
No power vent airflow RW
No combustion airflow RW
Blocked flue RW
Burner 1 fault RW
* 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
Units Range
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 fault RW
Ignition module 1 fault RW
Ignition module 2 fault RW
Blower 1 fault RW
Blower 2 fault RW
Gas valve 1 fault RW
Gas valve 2 fault RW
Low water RW
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
Units Range
I-P units SI units I-P units SI units
-- -- -- --
Continued
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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 soon RW
Service unit RW
Drain pending RW
No airflow RW
Interlock open RW
Freeze drain RW
End of season drain active RW
Temp comp on RW
Clean probes RW
Duct HL trip RW
Duct HL span RW
Insufficient water flow RW
Boiling temp calibrated RW
Master enable open RW
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
Units Range
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.
Assignment Description Application considerations
0 Trim
1 Load
2 Peak
3 Redundant
• 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 ______________________________________________
Issue definition ______________________________________________________
Alerts Log items _____________________________________________________
Time issue began ____________________________________________________
Recent system changes ________________________________________________
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Troubleshooting guide
Table 81-1: Troubleshooting guide
Issue Possible causes Actions
Green power indicator light is off on Vapor-logic board
No remote indication of alarm light No remote activation of fan
No readable information on touchscreen display
Power issues
Touchscreen display does not energize
Display is completely black
Touchscreen does not respond to touch
• No control voltage • Check for proper supply voltage.
• Transformer secondary circuit breaker tripped • Check for wiring shorts; reset breaker.
• Dry contact connection not programmed from
• Field wiring not installed • Provide field wiring.
• Field-supplied remote fault indicator lamp is burned
• Remote fault Vapor-logic dry contact is not
• No power or incorrect voltage to Vapor-logic
• Modular communication cable is disconnected • Connect modular cable.
• Nonexistent supply voltage to unit • Check main fuse.
• Nonexistent 24 VAC supply to Vapor-logic board • Check for proper supply.
• Nonexistent 21 VDC supply to display • Check 21 VDC voltage supply of the board at
• Humidifier over-temperature thermostat open • Reset manual switch located above heater below
• Touchscreen display is overheated • Cool the touchscreen display.
• Communication cable not connected • Connect cable.
• Defective cable • Replace cable.
• Defective touchscreen display • Replace.
• Defective control board • Contact DriSteem.
• Touchscreen software has locked up • Unplug the communication cable to the display
Settings menu
out
switching
board
TROUBLESHOOTING
• Go to the programmable outputs section of Settings menu to program dry contacts.
• Check if at remote indicator light is burned out; replace if needed.
• Check dry contact continuity (Vapor-logic terminal P12) for contact closure.
• Check main power supply.
• 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
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TROUBLESHOOTING
Troubleshooting guide
Table 82-1: Troubleshooting guide (continued)
Issue Possible causes Actions
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)
Issue Possible causes Actions
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.
• In-line strainer plugged • Clean as needed.
• Humidifier cover interlock switch improperly wired
• Fill valve not open • If 24 VAC is present across fill valve coil, replace valve.
• Fill valve not wired properly to control board • Verify proper fill valve wiring at terminal P17 (fill, drain) and
• Inlet water needle valve closed or plugged • Check if needle valve is open and free of sediment.
• Fill valve with incorrect operating voltage • Verify valve coil is 24 VAC.
• Plugged fill valve • Remove fill valve and check for foreign material plugging the valve.
• Fill valve installed backward • Check arrow direction on valve; or ”In” should be visible on fill
• Excessive water hammer can bend a needle
valve and make it difficult to open
• Orifice after fill valve may be plugged • Service valve strainer and orifice assembly.
• Drain valve leaking water • Verify drain is in the Auto position and is closed.
• Missing probe rod • Replace missing probe rod if possible; otherwise, replace probe
Tank is full.
• Probe malfunctioning • Clean or replace probe.
• No tank ground • Install tank ground.
• Fill valve stuck open • Check valve for foreign matter.
• Fill valve installed backward • Check arrow direction on valve; or ”In” should be visible on fill
• Excessive condensate is draining into the tank • Consult DriSteem to increase the amount of water that can be
• Drain valve not fully closed • If an obstruction does not allow drain valve to fully close, clean
• Poor tank ground • Verify good machine ground.
TROUBLESHOOTING
• Correct wiring.
P18 (secondary heat exchanger fill valve(s)).
• Test operation by going to the Test section under the Diagnostics menu.
valve body.
• Replace valve, if needed.
• Install a water supply line shock arrester.
rod assembly.
• Verify probe wiring is correct.
valve body.
converted to steam before receiving a fault.
valve.
• If there is a broken or weak return spring on drain valve, replace
the valve.
• Check if 24 VAC is present at valve. If so, check wiring of
Vapor-logic
control board terminal P17 (drain).
Continued
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TROUBLESHOOTING
Troubleshooting guide
Table 84-1: Troubleshooting guide (continued)
Issue Possible causes Actions
Unit does not fill with water. • Malfunctioning fill valve • Unplug probe head. Fill valve should open. If fill valve does not
open, verify proper 24 VAC to fill valve. If voltage is present and valve does not open, replace valve or valve coil.
• Verify that coil is 24 VAC.
• Verify that valve stem moves freely.
• No water supply to fill valve • Check if water supply line strainer is plugged.
• Verify that manual water line shut-off valve is open and that pressure exists.
• Check that in-line needle valve is open.
• Unit is not in Auto Mode • Change mode to Auto.
• Vapor-logic control is in end-of-season drain mode
• Inlet water needle valve is closed • Check needle valve.
• Unit is in freeze protection draining • Change mode to Auto.
• Fill valve stuck in closed position • Recycle power to recycle fill valve closing and opening.
• Malfunctioning level control system • See below.
Fill valve does not close • Open drain valve • If automatic drain valve is locked in the manual open position,
Filling issues
• Malfunctioning level control system • Check that probe plug is plugged in fully.
• Fill valve is stuck • Check if fill valve is installed backwards. If yes, repipe.
• Check for humidification demand signal at control board.
reset to automatic.
• Replace valve if there is a broken return spring on the drain valve.
• Clean or replace drain valve if an obstruction in the valve does not allow complete closure.
• Close manual drain valve if it is open.
• If Vapor-logic shorted output to fill valve coil, replace board or drain coil.
• If needed, clean probe rods or replace.
• Replace board if Vapor-logic control board is defective.
• Verify that system is in auto mode.
• Verify that probe is wired correctly.
• If there is a faulty internal spring or diaphragm in the fill valve, replace valve.
• Check if there is an obstruction that does not allow valve to seat properly. Clean or replace valve as needed.
• Check for control voltage across fill valve coil. (Check wiring and controls.)
• Install water inlet shock arrestor.
Continued
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Troubleshooting guide
Table 85-1: Troubleshooting guide (continued)
Issue Possible causes Actions
Alerts:
Tank not draining
Unit does not perform automatic drain sequence
Draining issues
Unit does not perform end-of-season drain
Alert:
Drain sensor out of range
• Tank drain outlet • If the humidifier tank drain outlet is plugged, clean.
• Water detection probes • Clean probe or replace probe rod assembly.
• Drain valve wiring • Check drain valve wiring.
• Fill valve • Check for voltage present at the valve. If present, clean or
• System programmed for manual drain • Run a test cycle to see if the system activates drain output.
• Drain line backing up with water
• Drain line plugged
• Automatic drain is disabled • Go to Settings menu to verify that auto drain/flush is enabled.
• Drain fault, plugged drain valve, or plugged drain pipe
• Malfunctioning automatic drain sequence • Go to Settings menu and check auto drain/flush settings.
• No power to the automatic drain valve • Check if 24 VAC is present at terminal block P17 (drain) and
• Defective automatic drain valve • If voltage is present at the valve and it still does not open,
• Input signal always has a demand • Reduce demand signal.
• Vapor-logic
• Drain valve • Valve not wired, or incorrectly wired, to control board.
• Signal outside of 4-20mA • Check P6 voltage from CS2 to ground (2-10vdc)
TROUBLESHOOTING
• Check to be sure drain valve is wired to Terminal P17 (drain) on control board.
• Reset Vapor-logic.
replace valve.
• Replace fill valve if water is leaking through.
• Insufficient drain line pitch.
• Insufficient drain line size. See tank manual for drain piping size and pitch requirements.
• Clean drain valve piping.
at drain valve.
replace valve.
setup • Verify in Settings menu Vapor-logic is set for end-of-season
drain.
• Check 24 VAC across valve coil during test cycle.
• 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.
Continued
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TROUBLESHOOTING
Troubleshooting guide
Table 86-1: Troubleshooting guide (continued)
Issue Possible causes Actions
Alert:
Tank temperature sensor failed
Alert:
Tank overtemp
Reduced or not output (even though water level is correct)
Tank does not heat up. • Over-temperature thermostat switch located
Heating issues
Humidifier tank has proper water level and is always warm.
• Open, shorted, or incorrect wiring of sensor • Check wiring terminals for correct wiring and voltages.
• Humidifier interlock switches and/or over­temperature thermostat
• Unit has overheated; temperature is at 25 ºF (14 ºC) over boiling temperature
• Faulty sensor • Replace sensor.
• Dirty heat exchanger • Clean.
• Dirty burners
• Low gas pressure
under heater wiring cover tripped
• Humidifier cover interlock switch (select models only)
• Incorrect or nonexistent control voltage • Check for proper supply voltage on electrical diagram.
• Incorrect or nonexistent supply voltage to the unit
• Duct RH above high limit set point • Check for duct airflow.
• No demand signal • Check signal by others.
• Humidifier is in Standby mode • Change mode to Auto.
• Aquastat • This is normal; the aquastat is maintaining a certain tank water
1000 Ohms = 68 °F (20 °C); 1702 Ohms = 212 °F (100 °C).
• Verify that switch or thermostat is wired.
• 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)
Issue Possible causes Actions
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-logic firmware
• 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-logic control 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)
Issue Possible causes Actions
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)
Issue Possible causes Actions
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.
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REPLACEMENT PARTS

Replacement parts
Table 90-1: Vapor-logic replacement parts
Description Quantity Part number
Kit (includes main controller and required Molex plugs) 1 183504-004
Touchscreen display - GTS LX series only 1 183508-001
Touchscreen display communication cable (contact DriSteem for lengths other than 27" (686 mm) and 60" (1524 mm)
Grip elastomeric touchscreen display 1 408494-023
Molex connector plug, 2-position 1 406246-002
Molex connector plug, 3-position 1 406246-003
Molex connector plug, 4-position 1 406246-004
LonTalk card 1 408642
FIGURE 90-1: VAPOR-LOGIC REPLACEMENT PARTS
27" (686 mm) 408490-014
60" (1524 mm) 408490-009
Main board Touchscreen display
Molex connector plug (2-position shown)
VAPOR-LOGIC® VERSION 6 INSTALLATION AND OPERATION MANUAL
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LonTalk card
Page 95
Notes
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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.
© 2019 Research Products Corporation
Firmware Version 6.X.X Form No. VL6-IOM-EN-0619 Part No. 890000-761 Rev A
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