Pure Humidifier INTAC Instructions for use

1
INTAC®
Microprocessor Humidifier Controller
Installation Instructions
—————————————————
Operation and Maintenance Manual
Form No: INOM-12-19
READ AND SAVE THESE INSTRUCTIONS
Our results are comforting
INTAC
Humidifier Control System
PURE Humidifier Co.
% Power 68%
Heaters 1 2 3 002
NORMAL FILL DRAIN SYSTEM
OPERATION FAULT
ENTER
100 200 300
HOME
®
TM
PURE HUMIDIFIER® and INTAC® are registered trademarks of PURE Humidifier Co.

1
Table of Contents
INTAC® Specifications ………………………………………………………………... 1
INTAC® Keypad Features …………………………………………………………….. 2
INTAC® Menu Overview - How to Navigate ………………………………………… 3
INTAC® Menus - How to Navigate - Home Display ………………………………... 4
INTAC® Menus - How to Navigate - 100 & 200 Menus ……………………………. 5
INTAC® Menus - How to Navigate - 300 Menu …………………………………….. 6
INTAC® Menus - How to Navigate - 500 Menu …………………………………….. 7
Modes of Operation Description - Electric Humidifiers ……………………………. 8
Modes of Operation Description - Gas Humidifiers ………………………………... 8
Modes of Operation Description - Steam-to-Steam ……………………………….. 8
Tri-Probe Operation …………………………………………………………………… 9
Automatic Drain Cycle ………………………………………………………………… 9
PID Control Loop Tuning ……………………………………………………………... 10
INTAC® Optional Features ……………………………………………………………. 11-12
INTAC® Terminal Board Connections ……………………………………………….. 13-14
INTAC® Hardware Layout …………………………………………………………….. 15
Modbus Modbus Register Map ………………………………………………………. 16
INTAC® Error Code Summary ……………………………………………………….. 17-20
INTAC® Complete Menu Listing ……………………………………………………... 21-26
Notes ……………………………………………………………………………………. 27

1
INTAC® Specifications
Specifications
Supply Voltage: 24VAC ± 20% at 50/60 Hz, ± 1HZ, 9.33VA max.
Current Input Impedance: 93 Ohms
Voltage Input Impedance: 5000 Ohms
Minimum Output Voltage Impedance: 1kOhm
Maximum Output Current Impedance: 800 Ohm
Termination: Removable screw terminal block
Screw Termination Wire Size: 16-gauge maximum
Maximum wire length to Tri-Probe: 50 feet*
Thermocouple Wire for Tank Temp Sensor When Used: Type K
Ambient Temperature Range: -67ºF to 130ºF
Relative Humidity: 0 to 90% RH, non-condensing.
Vibration: 2g., 10 to 150 HZ., applied in any one of three axes.
Storage Temperature: -40ºF to 158ºF
Limits, Ranges, Accuracy: Calibration accuracy and sensor conformity: ± 1% of Span, ± 1 LSD at 77ºF
±5ºF at rated line voltage ± 10 %
*For standard water units only. The Tri-Probe level sensor wiring is susceptible to interference
from wire-to-wire capacitance and wire-to-ground capacitance. For remotely mounted panels with less
than 20 feet of wire length for the Tri-Probe wires 18-gauge thermostat wire may be sufficient. For
distances up to 50 feet it is best to use individual stranded 20-gauge THHN wire with a minimum
insulation thickness of 0.030 inches run in a nonmetallic conduit. This conduit shall contain the three
Tri-Probe wires only. The tank ground wire that terminates on plug J2 terminal #7 and all other low
voltage wiring shall be run separate from the Tri-Probe wires. Unshielded TIA Category 6 networking
cable may alternately be used, provided that the cable is not run inside a metal conduit or parallel to
and within 2 inches of a metal conduit or pipe for more than 10 feet. Furthermore, only one conductor
of each twisted pair is used for the probe wiring and the ground wire is also run separate from this wire
bundle. The other 5 wires in the bundle shall be cut and taped off on both ends so they do not short to
one another or to ground.

2
INTAC
Humidifier Control System
PURE Humidifier Co.
% Power 68%
Heaters 1 2 3 002
NORMAL FILL DRAIN SYSTEM
OPERATION FAULT
ENTER
100 200 300
HOME
®
INTAC® Keypad Features
Normal Operation LED
(Green Colored):
Indicates normal
Operation
Menu Number
Display: 2 line x 20 character
vacuum fluorescent display
Drain LED: On
whenever the
drain valve is open
System Fault LED:
indicates when an
error or fault has occurred
Enter Key: Used to
toggle/confirm setting
once it has been
changed and to access
the 300 menu
“Down” & 200 Menu Key:
Used to access the 200 menu,
decrease a value, or scroll
down in a menu
“Up” & 100 Menu Key:
Used to access the 100 menu,
increase a value or, scroll
up in menu
100, 200, 300 KEYS ARE USED TO ACCESS CORRESPONDING MENU
DEPRESS 200 & 300 KEYS SIMULTANEOUSLY TO ACCESS THE 500 MENU
The Home Display is accessed by depressing the 100 & 200 keys simultaneously
(Home=Home Display)
Fill LED: On
whenever the
fill valve is open

3
HOW TO NAVIGATE:
Press and simultaneously to exit any menu and reach the home
display at any time.
Press or to move up or down through the home display or menu
screens.
To access a menu, press and hold the corresponding numbered menu key for
three (3) seconds. To access the 500 Menu, press and hold the
and simultaneously for three (3) seconds.
Press to activate a menu prompt. The prompt will begin to blink.
Press or to change a prompt value.
Press to confirm a prompt value.
200
ENTER
Notes:
> Menus can only be accessed from the home display. Press and simultaneously
to exit any menu and reach home display.
INTAC® Menus Overview
300
ENTER
100 200

4
HOME DISPLAY
Normal Operation
Safety
Circuit Open E01
RH Alarm
Low RH A01
RH Set Pt 45%
Actual 40% 001
75% Power
Heaters 1 2 3 4 002
Capacity
180 lbs/hr 003
H2O Level
Full 004
HL RH Set Pt
50% RH 005
HL RH Actual
60% RH 006
H2O Set Pt
45°F 007
H2O Actual
212°F 008
Outdoor Air
Temp 78°F 009
Control
SCR 010
Time to Clean
30 Days 011
Accumulated Run
Time 60 Days 012
<NORMAL
DISPLAY
<
ERROR AND
ALARM
DISPLAYS
<
SYSTEM
OPERATION
DISPLAYS
Note:
This is a complete listing of all
the displays and menu prompts.
Not all displays and menu
prompts will appear on your
controller as they are
dependent on your configuration
number. Prompts shown are
examples only and may not
represent your control settings.
INTAC® Menus
PRESS TO MOVE
UP OR DOWN
THRU THE HOME
DISPLAY

5
100
RH Set Pt
45% RH 101
HL RH Set Pt
80% RH 102
RH Lo Alarm
-5% RH 103
RH Hi Alarm
5% RH 104
200
Operational Mode
Normal 201
Drain Duration
10 Minutes 202
Drain Interval
40 Hours 203
Cool Down Delay
150 Seconds 204
Cool Down Temp
200°F 205
Fill Delay
5 Seconds 206
H2O Set Pt
45°F 207
H2O Hysteresis
3°F 208
End of Use Drain
48 Hours 209
Time to Clean
30 Days 210
Clean Reset
Off 211
PRESS TO
MOVE UP OR
DOWN THRU
THE HOME
DISPLAY
PRESS TO
MOVE UP OR
DOWN THRU
THE HOME
DISPLAY
Note:
This is a complete listing of all
the displays and menu prompts.
Not all displays and menu
prompts will appear on your
controller as they are
dependent on your configuration
number. Prompts shown are
examples only and may not
represent your control settings.
MENU 100
PRESS AND HOLD FOR
3 SECONDS UNTIL MENU
APPEARS
MENU 100 - CONTROL
PARAMETERS
MENU 200
PRESS AND HOLD FOR
3 SECONDS UNTIL MENU
APPEARS
MENU 200 - WATER & COM
PARAMETERS
INTAC Address
1212
INTAC Baud Rate
38400 213

6
300
Room Prop Band
25% RH 301
Room Hysteresis
3% RH 302
Room Integral
5.00 Minutes per repeat 303
Cycle Time
1.0 Seconds 305
Duct Derivative
0.00 Minutes 309
PRESS TO
MOVE UP OR
DOWN THRU
THE HOME
DISPLAY
Note:
This is a complete listing of all
the displays and menu prompts.
Not all displays and menu
prompts will appear on your
controller as they are
dependent on your configuration
number. Prompts shown are
examples only and may not
represent your control settings.
MENU 300
PRESS AND HOLD FOR
3 SECONDS UNTIL MENU
APPEARS
MENU 300 - PID
(PROPORTIONAL,
INTEGRAL & DERIVATIVE)
Duct Prop Band
25% RH 306
Duct Hysteresis
3% RH 307
Duct Integral
0.00 Minutes per repeat 308
ENTER
Room Derivative
0.00 Minutes 304
RH Input Filter
1 Seconds 310

7
MENU 500
PRESS AND HOLD
SIMULTANEOUSLY FOR
3 SECONDS UNTIL MENU
APPEARS
MENU 500 - INSTALLATION
ENTER
and
200 300
Note:
This is a complete listing of all
the displays and menu prompts.
Not all displays and menu
prompts will appear on your
controller as they are
dependent on your configuration
number. Prompts shown are
examples only and may not
represent your control settings.
Control Source
Transmitter 502
H2O Sensor
K Type 503
RH Sensor
Voltage 504
RH Process Lo
0.00 Volts 505
RH Process High
10.00 Volts 506
Hi-Limit Sensor
Voltage 508
HL Process Lo
0.0 Volts 509
HL Process Hi
10.0 Volts 510
Air Sensor
Current 511
Air Process Lo
4.00 Milliamps 512
Air Process Hi
20.00 Milliamps 513
Air Range Lo
-30°F 514
Air Range Hi
130°F 515
Air Offset
0°F 516
Process Output
Voltage 517
Out Process Lo
0.00 Volts 518
Out Process Hi
10.00 Volts 519
Dedicated Input
Pnl Lockout 520
Temperature Unit
Fahrenheit 521
Capacity Unit
Lbs/Hr 522
Unit Capacity
40 Lbs/Hr 523
Menu Access
All Menus 525

8
MODES OF OPERATION DESCRIPTION
The INTAC® controller is preprogrammed at the factory for modulation control. The INTAC® will use the
analog input on plug J2 terminals 1 and 3 for voltage inputs and J2 terminals 2 and 3 for current inputs.
When programmed for “transmitter” mode on menu 502 a second modulating high-limit input may also
be used on plug J4 terminals 5 and 7 for voltage inputs and J4 terminals 6 and 7 for current inputs.
ELECTRIC HUMIDIFIERS
SCR
The fastest acting mode of modulation available is SCR control. SCR stands for silicon-controlled
rectifier. Two SCRs are employed back-to-back in a device called a solid state relay (SSR). The SSRs
are used to switch the power on and off to each heating element on a very short time scale. The
INTAC® will send a pulse to each SSR according to the control signal for a percentage of the cycle time
of one second (field adjustable). For example at 50% power the SSR will be on for ½ a second and off
for ½ a second. This type of modulation is designed to provide extremely accurate control of the
humidifier output. For a three phase humidifier, each set of heating elements within the humidifier
evaporating chamber will be modulated to provide 0-100% modulating control of the humidifier output
(capacity).
GAS AND STEAM-TO-STEAM HUMIDIFIERS
STEAM
Steam mode is used when the INTAC® is used to control a steam-to-steam heat exchanger humidifier
type. Pressurized steam is introduced through a steam control valve into a heat exchanger submerged
in water. The valve modulation is controlled by an electric actuator. The INTAC® will control the electric
actuator with an analog control signal to modulate the amount of steam entering the heat exchanger
which will in turn control the amount of steam production on the outside of the heat exchanger. Up to 3
heat exchangers can be used in one humidifier. The control valves on multiple heat exchanger units are
typically set to run in parallel.
Steam mode can also be used for direct steam injection type humidifiers. The water tank related
controls are disabled when used for direct steam injection applications.
GAS
Gas mode is used when the INTAC® is used to control a natural gas or propane burner that is fired into
a heat exchanger submerged in water. The INTAC® will send a modulating analog signal to an actuator
that is mechanically linked to dampers that control the fuel and air entering the gas burner. The amount
of heat produced by the burner is modulated to control the amount of steam produced by the heat
exchanger. Up to 3 heat exchangers can be used in one humidifier. In a three heat exchanger
humidifier only the first burner modulates while the second and third burners are staged on and off.

9
TRI-PROBE OPERATION
Humidifier models that run on tap water will use the dissolved mineral content and associated
conductivity of the water to sense the water at discrete levels near the top of the tank. The Tri-Probe
water detect circuit is based on the level detection of a 6KHZ (approximately) square wave with nominal
Vpp of 1.0 volts. The voltage is applied to the probe so that when a probe tip is in contact with the water
a circuit is completed through the water to tank ground and a resistance value can be calculated. If a
probe is not in contact with the water then the circuit is not complete and the controller sees a high
resistance. Similarly when the water level being sensed is free of minerals, and therefore
nonconductive, the controller will measure a large resistance and will not “see” the water level. The
water in the tank must have a resistance of less than 13 kOhm/cm in order for the controller to logically
say “yes” there is water at this probe level.
The three probes are used to control the fill valve and heaters in the following manner
1) The water level falls as steam is generated
2) The middle probe eventually loses contact with the water
3) The fill valve is energized
4) The water level rises up to the top probe
5) After 5 continuous seconds (fill delay) of water contact with the top probe the fill valve closes
6) If at anytime the bottom probe is not in the water the heaters are de-energized and will remain off
Humidifier models that use reverse osmosis or deionized water will use a float switch as a low water
cutout and a mechanical float valve for controlling the makeup water.
AUTOMATIC DRAIN CYCLE
Humidifier models that run on tap water will accumulate minerals in the water as the water is boiled
away . Sometimes immediately but always eventually the dissolved minerals will reach saturation and
begin to precipitate out of the water. For this reason it is necessary to drain the tank down periodically
to reduce the accumulation of minerals and extend the time period between cleanings. The process the
INTAC® goes through to accomplish this is called the Automatic Timed Drain.
By default the humidifier begins counting run time whenever the humidifier output is greater than 0%.
The time it must count up to before starting the cycle is called the Drain Interval (MENU 203). When the
Drain Interval time is reached the humidifier will enter the cool down phase where the fill valve turns on
for a specified amount of time (MENU 204) or until a certain tank temperature is reached (MENU 205).
When the cool down phase ends the drain valve is energized and will remain energized for the Drain
Duration (MENU 202). When 3/4 of the Drain Duration time has expired, the fill valve will turn on to stir
the minerals on the tank bottom. When the drain duration time elapses, the drain valve will turn off and
the fill valve will remain on until the tank is refilled. The Drain Duration (MENU 202) is factory set to the
amount of time it typically takes for the tank to completely drain down. The Drain Interval (MENU 203)
should be adjusted to minimize observed mineral accumulation.
Alternately the Automatic Timed Drain can be controlled with an external switch or relay if it is desired to
control the timing of this feature. Consult the factory to receive instructions on how to change the factory
menu settings.

10
PID CONTROL LOOP TUNING
For most humidification applications, the parameters in a humidifier control loop that are based off of a
room humidity sensor or return air humidity sensor should be set so that the % demand signal changes
relatively slowly. This is due to the high thermal inertia involved with boiling water. There is an
appreciable lag between the moment heat is applied to water to the moment it reaches a steady state of
steam production. Additionally, it takes typically 10-30 seconds for an increase or decrease of the
steam injected in the duct to be sensed by the space or return air humidity sensor. In most applications
the amount of outside air is not dramatically changed from one minute to the next. The ambient
moisture of the outside air does not change radically either. All of these reasons lend to a relatively slow
room control response.
Conversely, a supply air modulating high-limit sensor control loop should be set to react quickly to
prevent the supply air from being saturated while still allowing reduced modulation of the humidifier. The
supply air humidity sensor’s purpose is to prevent wetting. The supply control loop is there to override
the room/return air control until typical operating conditions return. This can happen on VAV systems
where the amount of total airflow is changed abruptly. It can also happen when units are first turned on
or when rotating units in redundant setups.
The PID (Proportion, Integral and Derivative) terms all affect the way a control signal will react to a
change in the process variable, which in this case is the relative humidity. The actual analog (0-10 VDC
or 4-20 mA) signal from a typical humidity sensor will vary at the 0.1% level even when the room
temperature and relative humidity are held constant. An example of this is that if one looked at a
reading from a humidity sensor on a second-by-second basis in a stable environment, the readings
would be 50.0, 50.1, 49.8, 50.1, etc. Unless the raw value of this signal is filtered (by time averaging
with menu 310 RH Input Filter) the derivative term (MENU 304) should not be used because it will add
instability to the control loop. Similarly the proportion band (MENU 301) should be wide enough (small
proportion gain) so that the control signal does not bounce up and down due to this small fluctuation of
the raw humidity reading. The proportion term will generally be between 10% to 25%. With the
proportion band set the speed of the control loop can now be adjusted by increasing or decreasing the
integral term (MENU 303). Increasing the integral term will slow down the rate the power increases
when the humidity is below set point.
One final note about the room control loop and the supply air high-limit control loop is that the two loops
have different functions and therefore should behave differently. The supply air high-limit is exactly as
its name suggests, a limit type of control. It is trying to keep the relative humidity below a particular
value. Conversely, the room/return control loop’s goal is to maintain around a particular value.

11
OPTIONAL FEATURES
MODULATING HIGH-LIMIT FOR VARIABLE AIR VOLUME AHU’S (VAV)
When the INTAC® is set to transmitter mode (menu 502) a modulating high-limit sensor (menu 508) may
be used in addition to the main room or return air humidity sensor. This sensor is located in the supply air
downstream of the steam injection tubes. It is used by the INTAC® to gradually reduce the humidifier
output to limit the supply air relative humidity below saturation. It is typically set to a lower RH value than
the on/off mechanical safety humidity high-limit that is wired to the J6 plug terminals 5 and 6. The benefit
to using this modulating sensor is that humidification is maintained without tripping the safety high-limit
humidistat when the supply air temperature or volumetric flow are change abruptly. The INTAC® is always
comparing the room/return air humidity and the supply air humidity and choosing control loop the results in
the lowest power level. The setpoint of modulating high-limit should be above the corresponding dew point
of the main room/return air sensor so that eventually the control power will revert back to being controlled
by the room/return air. For example, with a 40%RH setpoint at 70°F room temp your supply air high-limit
setpoint needs to be above 66%RH at 55° F. If not the INTAC® will be controlling based on the supply air
humidity. Resulting in poor control over the room/return air RH.
FREEZE PROTECTION/STANDBY WATER TEMP
Using a type K thermocouple probe the INTAC® senses the temperature of the tank water and will turn the
power to the heating source on if there is no call for humidity and the tank temperature is below the value
set on MENU 207
OUTDOOR AIR TEMPERATURE SETBACK OPTION
As outside air temperature decreases, it may be desirable to reduce the humidifier output proportionately
to reduce the risk of wetting interior surfaces and windows within a structure. With the optional outdoor air
temperature setback feature, the user is able to select a point at which the humidifier output will begin to
decrease or setback. The factory default is at 32°F and is user-adjustable from 32°F to 92°F.
Applicable settings:
First, it is necessary to know the temperature range of the sensor, which are the
minimum and maximum values. (Example: for the MAMAC Systems® TE-211Z-B-B-2-1-E-3, the
range is –30°F to +130°F with a corresponding output current of 4 to 20mA.)
Next go to:
MENU 511 Air Sensor Select “Current” (Corresponds to the type of output)
MENU 512 Air Process Lo Select “4.0” (Corresponds to current range Low)
MENU 513 Air Process Hi Select “20.0” (Corresponds to current range High)
MENU 514 Air Range Lo Select “-30°F” (Corresponds to temp range Low)
MENU 515 Air Range Hi Select “+130°F” (Corresponds to temp range High)
MENU 516 Air Offset Select “0°F” (Offset from 32°F)
Note: when selecting AIR OFFSET, this refers to an offset from 32°F. For example: if you wish the
humidifier setback to begin at 32°F, then the Air Offset amount should be left at 0°F. If you wish the
humidifier setback to begin at 45°F, then the Air Offset amount should be set at 13°F. If you wish the
humidifier setback to begin at 55°F, then the Air Offset should be set at 23°F, and so on. Also, remember
that the above settings are for the given example and may be different for other temperature sensors.

12
WHERE TO LOCATE SENSOR
Locate the air temperature sensor in the outside air intake duct to the humidifier.
HOW TO CALIBRATE AIR TEMPERATURE SENSOR
The air temperature sensor is factory calibrated and calibration should not be necessary if the High and
Low range limits are set correctly. If a slight calibration is desired, proceed as follows:
First, determine if the INTAC® indication is too high or too low and by how many
degrees. This can be checked by using a probe-type thermometer located near the air temp
sensor and comparing the readings.
If, for example, the indicated reading is 2°F too high, a linear calibration shift can be
accomplished by adjusting both Menu 514 and 515 down 2°F. If the indicated reading is
2°F too low, adjusting both Menus 514 and 515 up 2°F will correct the error. A differential that is too large
may indicate a defective temperature sensor which should be replaced.
TYPICAL FIELD WIRING CONNECTIONS
AIR TEMPERATURE
SENSOR
Typical Loop
Powered
Transducer
4-20 mA
- +
1 2 3 4 5 6 7
J4
INTAC® Terminals
6 5 4 3 2 1
J9

13
INTAC® Terminal Board Connections
* Factory Option - This is a fixed value and can not be field modified. Factory set option only.
76 5 432 1
6 5 432 1
6 5 4 3 2 176 5 432 1 6 5 4 3 2 1
1
2
3
4
5
6
7
1
2
3
4
5
6
1
2
3
4
5
6
7
1
2
3
4
5
6
J5
J1
J6 J7 J9 J4
J8
J2
J3
Low Level Probe
Refill Level Probe
High Level Probe Tank Ground
Humidifier
Tank
1
2
3
Gray
Violet
Blue
TANK FILL VALVE * Enabled when menu 705 is set to "TRI-PROBE
TANK DRAIN VALVE *
Factory Option Enabled in menu 706
Yellow
Black
White
Black
24 VDC (+) UNREGULATED
24 VDC (-) COMMON
24 VDC (+) UNREGULATED
24 VDC (+) UNREGULATED
DC POWER SUPPLY
FOR HUMIDITY
AND TEMPERATURE
SENSORS
A-
B+
REF. GROUND
CURRENT (+)
COMMON(-)
OUTER BOARD
INNER BOARD
VOLTAGE (+)
COMMON (-)
OVER-TEMPERATURE SWITCH(S)
(switch opens on temp. rise, 250°F)
AIRFLOW SWITCH
(switch closes with air flow)
ON/OFF HIGH-LIMIT HUMIDISTAT
(switch opens on RH rise)
SAFETY CIRCUIT
Yellow (+)
Red (-)
VOLTAGE (+)
CURRENT (+)
COMMON (-)
CURRENT (+)
COMMON (-)
Green
LOW WATER FLOAT SWITCH * (switch opens with low water) Input is active only when menu 705 is set to "FLOAT"
BACK SIDE OF THE INTAC
CONTROLLER MOUNTED
ON THE PANEL DOOR
®
1 AMP @ 24 VAC (contact closes on alarm)
HIGH/LOW HUMIDITY ALARM CONTACTS
DISABLE SWITCH
(a closed contact disables the humidifier)
DEDICATED INPUT/ PANEL LOCK-OUT
(a closed contact locks the panel)
White Green Violet Gold
No Color
Yellow
Blue
Red
Silver
24 VAC COMMON 24 VAC HOT PANEL GROUND
PILOT RELAY - 24VAC
(plug in cube relay)
+ 5 VDC TRIGGER
24 VAC COMMON
HEATER #4 / BURNER # 3 HEATER #3 / BURNER # 2 HEATER #2 / BURNER # 1
TANK WATER TEMP THERMOCOUPLE *
Factory Option Enabled in menu 703 and Configured in Menu 503
HEATER #1 / Blower
TRI-PROBE - Standard water units only *
See Specifications page for wiring limitations
Input is active when menu 705 is set to
"TRI-PROBE"
INNER
BOARD
OUTER
BOARD
76 5 432 1
6 5 432 1
6 5 4 3 2 176 5 432 1 6 5 4 3 2 1
1
2
3
4
5
6
7
1
2
3
4
5
6
1
2
3
4
5
6
7
1
2
3
4
5
6
Tank Ground
Humidifier
Tank
1
2
3
24 VDC (+) UNREGULATED
24 VDC (-) COMMON
24 VDC (+) UNREGULATED
24 VDC (+) UNREGULATED
MODBUS
RS485 COM
CONNECTIONS
VOLTAGE (+)
CURRENT (+)
OVER-TEMPERATURE SWITCH(S)
(switch opens on temp. rise, 250°F)
AIRFLOW SWITCH
(switch closes with air flow)
ON/OFF HIGH-LIMIT HUMIDISTAT
(switch opens on RH rise)
SAFETY CIRCUIT
®
1 AMP @ 24 VAC (contact closes on alarm)
HIGH/LOW HUMIDITY ALARM CONTACTS
White Green Violet Gold
No Color
Yellow
Blue
Red
Silver
24 VAC HOT PANEL GROUND
ON/OFF HUMIDISTAT * (switch opens on RH rise)
Input is active when menu 701 is set to "ON/OFF"
PILOT RELAY - 24VAC
(plug in cube relay)
+ 5 VDC TRIGGER
24 VAC COMMON
HEATER #4 / BURNER # 3 HEATER #3 / BURNER # 2 HEATER #2 / BURNER # 1
Use shielded cable (Beldon #9842 minimum)
ISOLATED CONTROL INPUT OR HUMIDITY/SENSOR INPUT *
Input is active except when Control Type is ON/OFF and is configured in menus 502 and 504 thru 506
MODULATING HIGH LIMIT RELATIVE HUMIDITY INPUT *
Factory Option Enabled in menu 707 and Configured in Menus 508 thru 510
Input is functional only when menu 502 is set to "Transmitter"
CURRENT OUTDOOR AIR TEMP SENSOR INPUT *
Factory Option Enabled in menu 704 and Configured in Menus 511 thru 516
Input is functional only when menu 502 is set to "Transmitter"
ANALOG PROCESS OUTPUT *
Output is active when menu 701 is set to Gas or Steam and is Configured in menus 517 thru 519

14
For job specific wiring diagram please reference the materials packet or control
panel shipped with the equipment.
* Factory Option - This is a fixed value and can not be field modified. Factory set option only.
76 5 432 1
6 5 432 1
6 5 4 3 2 176 5 432 1 6 5 4 3 2 1
1
2
3
4
5
6
7
1
2
3
4
5
6
1
2
3
4
5
6
7
1
2
3
4
5
6
J5
J1
J6 J7 J9 J4
J8
J2
J3
Low Level Probe
Refill Level Probe
High Level Probe Tank Ground
Humidifier
Tank
1
2
3
Gray
Violet
Blue
TANK FILL VALVE * Enabled when menu 705 is set to "TRI-PROBE
TANK DRAIN VALVE *
Factory Option Enabled in menu 706
Yellow
Black
White
Black
24 VDC (+) UNREGULATED
24 VDC (-) COMMON
24 VDC (+) UNREGULATED
24 VDC (+) UNREGULATED
DC POWER SUPPLY
FOR HUMIDITY
AND TEMPERATURE
SENSORS
A-
B+
REF. GROUND
CURRENT (+)
COMMON(-)
OUTER BOARD
INNER BOARD
VOLTAGE (+)
COMMON (-)
OVER-TEMPERATURE SWITCH(S)
(switch opens on temp. rise, 250°F)
AIRFLOW SWITCH
(switch closes with air flow)
ON/OFF HIGH-LIMIT HUMIDISTAT
(switch opens on RH rise)
SAFETY CIRCUIT
Yellow (+)
Red (-)
VOLTAGE (+)
CURRENT (+)
COMMON (-)
CURRENT (+)
COMMON (-)
Green
LOW WATER FLOAT SWITCH * (switch opens with low water) Input is active only when menu 705 is set to "FLOAT"
BACK SIDE OF THE INTAC
CONTROLLER MOUNTED
ON THE PANEL DOOR
®
1 AMP @ 24 VAC (contact closes on alarm)
HIGH/LOW HUMIDITY ALARM CONTACTS
DISABLE SWITCH
(a closed contact disables the humidifier)
DEDICATED INPUT/ PANEL LOCK-OUT
(a closed contact locks the panel)
White Green Violet Gold
No Color
Yellow
Blue
Red
Silver
24 VAC COMMON 24 VAC HOT PANEL GROUND
PILOT RELAY - 24VAC
(plug in cube relay)
+ 5 VDC TRIGGER
24 VAC COMMON
HEATER #4 / BURNER # 3 HEATER #3 / BURNER # 2 HEATER #2 / BURNER # 1
TANK WATER TEMP THERMOCOUPLE *
Factory Option Enabled in menu 703 and Configured in Menu 503
HEATER #1 / Blower
TRI-PROBE - Standard water units only *
See Specifications page for wiring limitations
Input is active when menu 705 is set to
"TRI-PROBE"
INNER
BOARD
OUTER
BOARD
76 5 432 1
6 5 432 1
6 5 4 3 2 176 5 432 1 6 5 4 3 2 1
1
2
3
4
5
6
7
1
2
3
4
5
6
1
2
3
4
5
6
7
1
2
3
4
5
6
Tank Ground
Humidifier
Tank
1
2
3
24 VDC (+) UNREGULATED
24 VDC (-) COMMON
24 VDC (+) UNREGULATED
24 VDC (+) UNREGULATED
MODBUS
RS485 COM
CONNECTIONS
VOLTAGE (+)
CURRENT (+)
OVER-TEMPERATURE SWITCH(S)
(switch opens on temp. rise, 250°F)
AIRFLOW SWITCH
(switch closes with air flow)
ON/OFF HIGH-LIMIT HUMIDISTAT
(switch opens on RH rise)
SAFETY CIRCUIT
®
1 AMP @ 24 VAC (contact closes on alarm)
HIGH/LOW HUMIDITY ALARM CONTACTS
White Green Violet Gold
No Color
Yellow
Blue
Red
Silver
24 VAC HOT PANEL GROUND
ON/OFF HUMIDISTAT * (switch opens on RH rise)
Input is active when menu 701 is set to "ON/OFF"
PILOT RELAY - 24VAC
(plug in cube relay)
+ 5 VDC TRIGGER
24 VAC COMMON
HEATER #4 / BURNER # 3 HEATER #3 / BURNER # 2 HEATER #2 / BURNER # 1
Use shielded cable (Beldon #9842 minimum)
ISOLATED CONTROL INPUT OR HUMIDITY/SENSOR INPUT *
Input is active except when Control Type is ON/OFF and is configured in menus 502 and 504 thru 506
MODULATING HIGH LIMIT RELATIVE HUMIDITY INPUT *
Factory Option Enabled in menu 707 and Configured in Menus 508 thru 510
Input is functional only when menu 502 is set to "Transmitter"
CURRENT OUTDOOR AIR TEMP SENSOR INPUT *
Factory Option Enabled in menu 704 and Configured in Menus 511 thru 516
Input is functional only when menu 502 is set to "Transmitter"
ANALOG PROCESS OUTPUT *
Output is active when menu 701 is set to Gas or Steam and is Configured in menus 517 thru 519

15
J5
J6
J4
J8
J7
J9
XFMRS
0004-0330-0000
0726
J1
J2
J3
INTAC® Hardware Layout (HC Model Shown)
ABC
KEY
AInner Circuit Board
BOuter Circuit Board
CTerminal Strips
DDCLMB - Dual Control Loop Module B
EWLCM - Water Level Control Module
FDCLMA - Dual Control Loop Module A
EDF

16
INTAC® Modbus Map
Modbus
Register
Number
INTAC®
Number
Menu
Number Menu Title Description
852 851 012 Accumulated Run Time 0-365 days
55 54 009 Outdoor Air Temp Actual -1000-10,000 implied tenths
53 52 008 Water Temp Actual -130- 2660, implied tenths
51 50 006 High Limit RH Actual 0-1000, implied tenths
823 822 none %Power Heater #1 or Combustion Blowers 0-100
824 823 none %Power Heater #2 or Burner #1 Enable 0-100
825 824 none %Power Heater #3 or Burner #2 Enable 0-100
826 825 none %Power Heater #4 or Burner #3 Enable 0-100
853 852 002 Total Power Output 0-100
49 48 001 Actual Humidity 0-1000, implied tenths
857 856 E01 Interlock Input Open
0=safety circuit open( error condition), 1=Safety circuit closed (safeties
satisfied)
858 857 E02 Dedicated Input 0=open contact, 1=closed contact
50 49 E03 Control RH Sensor 0=No Error, 1= Under range, 2= Over range, 3=Underflow, 4=Overflow
52 51 E04 High Limit RH Sensor 0=No Error, 1= Under range, 2= Over range, 3=Underflow, 4=Overflow
56 55 E05 Outdoor Air Sensor 0=No Error, 1= Under range, 2= Over range, 3=Underflow, 4=Overflow
54 53 E06 Water Sensor(temp) 0=No Error, 1= Under range, 2= Over range, 3=Underflow, 4=Overflow
831 830 E07 Water Level
0=No error, 1=bad Tri-Probe, 2=Fill fault, 3= Refill fault, 4=Low float, 5=Low,
6=Drain fault
847 846 E08 Internal Module #1 I/O Error 0=no, 1=yes
848 847 E08 Internal Module #2 I/O Error 0=no, 1=yes
849 848 E08 Internal Module #3 I/O Error 0=no, 1=yes
102 101 101 RH Set Point 0 to 1000, implied hundredths
103 102 102 High Limit Set point 0 to 1000
104 103 103 RH Low Alarm (-1) to -1000, implied tenths
105 104 104 RH High Alarm 1 to 1000, implied tenths
202 201 201 Operation Mode 0=Standby, 1=Normal, 2=Flush, 3=Forced Drain
203 202 202 Drain Duration Timer 0 to 120 minutes
204 203 203 Drain Interval timer 1 to 500 hours
205 204 204 Cool Down Delay 0 to 150 seconds
206 205 205 Cool Down Temp 800-2120 def F, implied tenths
207 206 206 Fill Delay Timer 0-15
208 207 207 Water Temp Set Point 400-2000 deg F, implied tenths
209 208 208 Water Temp Hysteresis 10-500 deg F, implied tenths
210 209 209 End of Use Drain Timer 0-168 hours
211 210 210 Time to Clean Timer 0-365 days
212 211 211 Clean Reset 0=off, 1=on
213 212 212 INTAC® Address 1-247 modbus (read only)
214 213 213 INTAC® Baud Rate 0=9600, 1=19200, 2=38400
302 301 301 Room Prop band 0 to 1000, implied hundredths
303 302 302 Room hysteresis 1 to 500, implied hundredths
304 303 303 Room Integral 0 to 6000, implied hundredths
305 304 304 Room Derivative 0 to 999, implied hundredths
306 305 305 Cycle Time 1 to 10 for SCR
307 306 306 Duct Prop Band 0 to 1000, implied hundredths
308 307 307 Duct Hysteresis 1 to 500, implied hundredths
309 308 308 Duct Integral 0 to 999, implied hundredths
310 309 309 Duct Derivative 0 to 999, implied hundredths
311 310 310 RH Input filter 0-60
*Modbus parameters: Holding register(16 bit), Signed, 38400 Baud, Character format: 8 data, No Parity, One stop
**All parameter are available via communications but only some parameters are active in certain configurations.

17
INTAC® Error Code Summary
E01 Safety Circuit Open
An open circuit exists in the Safety Circuit. Check the following:
Terminals J6-5 & J6-6 High Limit Humidistat
Terminals J6-4 & J6-3 Air Flow Switch
Terminals J6-2 & J6-1 Over-Temp Switch*
Continuity MUST exist across these terminals to clear alarm
* SX and SXDDR models do not have an Over-Temp Switch
E02 Dedicated Event Circuit Open
An open circuit exists in the Dedicated Event Circuit. Check the following:
Terminals J1-5 & J1-6 Dedicated Event
Continuity MUST exist across these terminals to clear alarm
(Configuration Menu 520 turns this feature ON or OFF)
E03 Control RH Under Range
CHECK FOR THE FOLLOWING CONDITIONS:
1) Lost input signal from primary humidistat or Building Management System
2) Input signal below 6% RH (below 4 mA DC)
3) Input signal between 100% and 105%
Verify that Menus 502, 504, 505, & 506 match the type of input. Check
signal at the input terminals:
Terminal J2-1 = Voltage (+) Input
Terminal J2-3 = Voltage (-) / Current (-) Input
Terminal J2-2 = Current (+) Input
E03 Control RH Over Range
CHECK FOR THE FOLLOWING CONDITIONS:
1) Input signal between 100% and 105% (process control circuits only)
Verify that Menus 502, 504, 505, & 506 match the type of input. Check
signal at the input terminals:
Terminal J2-1 = Voltage (+) Input
Terminal J2-3 = Voltage (-) / Current (-) Input
Terminal J2-2 = Current (+) Input
E03 Control RH AD Underflow-AD Overflow
Check for REVERSE polarity or EXCESSIVE SIGNAL on the input terminals:
Terminal J2-1 = Voltage (+) Input
Terminal J2-3 = Voltage (-) / Current (-) Input
Terminal J2-2 = Current (+) Input
E03 Control RH Calibration
Input not calibrated properly

18
E04 High Limit RH Under Range
Check for lost signal from the Hi-Limit Humidistat or Building Management
System. Verify that Menus 502, 508, 509, & 510 match the type of input
Check signal at the input terminals:
Terminal J4-5 = Voltage (+) Input
Terminal J4-7 = Voltage (-) / Current (-) Input
Terminal J4-6 = Current (+) Input
E04 High Limit RH Over Range
Input signal is greater than menu 510 value
E04 High Limit RH Calibration
Input not calibrated properly
E04 High Limit AD Underflow - AD Overflow
Check for REVERSE polarity or EXCESSIVE SIGNAL on the input terminals:
Terminal J4-5 = Voltage (+) Input
Terminal J4-7 = Voltage (-) / Current (-) Input
Terminal J4-6 = Current (+) Input
E05 Outdoor Air AD Underflow
Air temperature sensor circuit open. Check for correct polarity.
Check signal at the input terminals:
Terminal J7-2 = Current (-) Input
Terminal J4-3 = Current (+) Input
E05 Outdoor Air AD Overflow
Input signal is greater than 20 mA
E05 Outdoor Air Over Range
Input signal is greater than menu 513 value
E05 Outdoor Air Under Range
Input signal is less than menu 512 value
E05 Outdoor Air Calibration
Input not calibrated properly
E06 H2O Temperature Over Range
Water temperature is above 260°F
E06 H2O Temperature Under Range
Water temperature is below –13°F
E06 H2O Temperature Calibration
Input is outside of calibration