Duct-Humidistat TDC-BH-U
Item Name
Item code
Variant
Features
TDC-BH-U-W20
TDC-BH-U-W24
TDC-BH-U-W25
40-10 0059-20
40-10 0059-24
40-10 0059-25
standard
humidifying
de-humidifying
Binary controller with:
1 Internal humidity input
1 external temperature input (For set point shift)
1 DO (Relay) for humidifier or dehumidifier
1 DO (Relay) for fan (optional)
-W20 = humidify and dehumidify
Deluxe = 7-day programmable
TDC-BH-U-D-W20
TDC-BH-U-D-W24
TDC-BH-U-D-W25
40-10 0060-20
40-10 0060-24
40-10 0060-25
Deluxe
humidifying
de-humidifying
Accessories
SOD-Tn10-1
AES3-HT-A5
40-20 0108
40-50 0104
Outdoor sensor
Replacement humidity sensor 5% accuracy
TDC-BH-U Duct-Humidistat
Features
Control for binary humidifiers and dehumidifiers with or without fan
support.
Low power energy consumption: < 1W per unit
Relays switching for outputs each up to 300W
Cost saving option with Economy functionality and set point limitations
External sensor input for setpoint setback based on outdoor
temperature
Password protected programmable user and control parameters
o Setpoint range limitation
o Access control for setpoints and mode change
o Access control for clock and time programs
o Select your display contents
o Selectable behavior after return from power failure
Temperature display of external input in Celsius or Fahrenheit
Deluxe Version:
Clock and time schedule functions
Blue backlight for LCD
Applications
Humidifiers:
o On / Off type humidifiers
o On / Off type humidifiers with single speed fan support
Dehumidifiers:
o On / Off type dehumidifiers
o On / Off type dehumidifiers with single speed fan support
Combination humidifiers and dehumidifiers without fan support
General description
The TDC-BH-U is a stand-alone electronic binary humidity stat. The TDC-BH-U features one internal humidity sensor, one
external NTC temperature sensor input and two binary outputs (Relays).
A detailed parameterization is possible with the use of a simple configuration routine. The TDC-BH-U can be configured using the
standard operation terminal. No special tools or software is required.
Ordering
Selection of devices and sensors
External temperature sensors: Use only our approved NTC sensors to achieve maximum accuracy. Recommended is SDB-Tn1015 as duct sensor and SOA-Tn10 as outdoor sensor.
Binary auxiliary devices: E.g. humidifiers, de-humidifiers and fans. Do not directly connect devices that exceed 2(1.2)A. Observe
startup current on inductive loads!
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Duct-Humidistat TDC-BH-U
Power supply
Operating voltage
24 V AC/DC ± 10 %, 50…60 Hz
Power consumption
Max. 1.5 VA
Electrical connection
Terminal Connectors,
wire 0.34…2.5 mm2 (AWG 24…12)
Deluxe type only:
Power backup for real time clock
Min 48h if charged for 24h
Signal inputs
Humidity input:
Range
Accuracy
Hysteresis
Element: Polymer-Based Capacity Sensor
0…100 % r.H.
10%...90% r.H. 5.0 %
0…10% and 90…100% 7.0 %
±1% r.H.
Temperature input
Range
External NTC (Sxx-Tn10 sensor):
-40…70 °C (-40…158 °F)
Accuracy
-40…0 °C (-40…32 °F): 0.5 K
0…50 °C (32…122 °F): 0.2 K
50…70 °C (122…158 °F): 0.5 K
Signal outputs
Digital switching outputs
Switching type
AC Switching power
DO1…DO2
Relays
2(1.2) A, 250VAC (max fan power 300W)
Environment
Operation
Climatic conditions
Temperature
Humidity
To IEC 721-3-3
class 3 K5
0°C …50°C (32°F…122°F)
<95% R.H. non-condensing
Transport & storage
Climatic conditions
Temperature
Humidity
Mechanical conditions
To IEC 721-3-2 and IEC 721-3-1
class 3 K3 and class 1 K3
-25°C…70°C (-13°F…158°F)
<95% R.H. non-condensing
class 2M2
Standards
conform according to
EMC Standard 89/336/EEC
EMEI Standard 73/23/EEC
EN 61 000-6-1/ EN 61 000-6-3
Product standards
Automatic electrical controls for
household and similar use
Special requirement on humidity
dependent controls
EN 60 730 –1
EN 60 730 – 2 - 9
Degree of protection
IP30 to EN 60 529
Safety class
III (IEC 60536)
Housing
Cover, back part
Filter material
Polycarbonate PC (UL94 class V-0)
PTFE coated 1μm pores
General
Dimensions (H x W x D):
Transmitter case:
Probe:
91 x 68 x 47mm (3.7” x 2.7” x 1.9”)
14 x 77 mm ( 0.55 x 3”)
Weight (including package)
220g (7.8 oz)
76 (3.0)
47 (1.9)
91 (3.6)
68 (2.7)
Technical specification
Dimensions mm (inch)
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Duct-Humidistat TDC-BH-U
CP10
YB1 DO1
YB2 DO2
RT
CP10 = 0
Humidify
Dehumidify
Temperature input for
setback
NTC 10kΩ @ 25°C (77°F)
CP10 = 1
Humidify
CP11 = ON: FAN
CP10 = 2
If CP11 = ON: FAN
Dehumidify
0…250VAC
0V (GND)
24V AC
2
G
TDC-BH-U
1
3
Q13
7 8
B1 M
R
T
5
Q23
YB1
4
Q14
YB2
6
Q24
Installation and safety advice
Caution! This device is intended to be used for comfort applications. Where a device failure endangers human life
and/or property, it is the responsibility of the owner, designer and installer to add additional safety devices to prevent
or detect a system failure caused by such a device failure. Vector Controls or its affiliates cannot be held liable for any
damage caused by such a failure. Failure to follow specifications and local regulations may endanger life, cause
equipment damage and void warranty.
Wiring diagram
Description:
Connections depend on parameter CP10 and CP11! (See page 10)
Mechanical design and installation
The unit consists of three parts: The back part with the probe, the flange and the cover.
Mounting location
The device should be installed on the duct in an area where the air stream is well mixed:
Locate a supply air sensor two or three meters downstream from the nearest fan and coil.
Mount the return air sensor close to the air inlet but downstream from a return fan if one is present.
Warning about storage, packaging and usage environment
The sensing part is a polymer, which measures the humidity in the ambient air. For proper sensor operation some
mandatory precautions need to be taken during storage, packaging and usage.
The transmitter and its sensing element should not be packaged, stored or used in out-gassing plastic materials, which
could cause sensor contamination. In particular, it is recommended not to use any glue or adhesive tapes (Sellotape,
Scotch-Tape, Tesa-Film, etc.) within the package or close proximity of the sensor. Foamed materials often cause
contamination problems and should not be used to package the transmitter. Best packaging material is a simple
cardboard box or a deep-drawn plastic case in a cardboard box.
Installation
1. Drill a hole with a diameter of 16mm (5/8”) in the air duct.
2. For installation of the transmitter directly on the duct: Drill two smaller holes for the self-tapping screws
diagonal on a diameter of 92mm (3.6”).
Tip: Use the housing as marking guide for the holes.
3. For installation of the transmitter with the flange: Drill two smaller holes for the self-tapping screws diagonal
on a diameter of 60mm (2.32”). Tip: Use the flange as marking guide for the holes.
4. Open the single screw on the cover and remove cover.
5. Connect the conductors to the terminals of the back part according to wiring diagram.
6. Insert the probe in the hole; secure the back part to the duct with two self-tapping screws.
7. While in the open position, slide the two hooks of the cover into the latch at the left side of the back part.
8. Close the front part.
9. With a Philips-type screw driver of size #2, carefully tighten the front holding screw to secure the cover to the
back part. This screw is located on the front right side of the front part. There is no need to tighten the screw
too much.
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Duct-Humidistat TDC-BH-U
Operation mode and state indication
Comfort (occupied)
All control functions operating per set points.
Economy (unoccupied):
Set points shifted according to Parameter CP04.
Economy mode and setpoint shift may be disabled with UP04
OFF
Energy Hold Off
Outputs are off, inputs monitored for alarm condition
Fan active
Fan is running
Temperature setback
Temperature setback is active and shifts setpoint
Left (POWER)
Up
Down
Mode
Display of operation
mode
Large digits
value.
Indicators
1 Temperature setback error
Vertical bar
Scrolls down = dehumidifying
Small digits
Right (OPTION)
parameter change)
Display and operation
Press < 2 sec.: Toggle
STANDBY-COMFORT mode or
switch from OFF to ON
Press > 2 sec.: Turn unit
OFF. Text OFF displayed with
current time (deluxe)
temperature (standard)
(Parameter setting: ENTER
to select menu option,
accept parameter change)
Display of input or parameter
Display of setpoint, clock or
parameter number.
Increment SET POINT
(Parameter setting: SCROLL
Scrolls up = humidifying
Press < 2 sec.: Switch display
Press > 2 sec.: Access time
programs, change time.
(Parameter setting: ENTER to
select menu option, accept
Decrement SET POINT
(Parameter setting: SCROLL menu
options and parameters)
Power failure
All the parameters and set points are memorized and don’t need to be reentered. Depending on Parameter UP03 the
unit will remain switched off, switch on automatically or return to the operation mode it was in before the power failure.
The deluxe version includes a real time clock with a 48h backup battery powered through a super capacitor. The time
does not need to be re-entered after a power failure.
Error messages
The TDC-BH-U may display the following error condition:
Err1: Humidity sensor faulty. The humidity sensor is damaged or removed. Verify if sensing element!
Err2: External input for temperature setback missing or damaged.
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Duct-Humidistat TDC-BH-U
Name on display
Function
Override reset
no
Switching event not used
OFF
Operation mode changes to off mode
Reset is active
ECO
Operation mode changes to economy mode
Reset is active
ON
Operation mode changes to comfort mode
Reset is not active
UNI
Operation mode does not change
Reset is not active
Advanced user setup menu
To enter the advanced user setup menu, activate the controller by pressing the POWER button. Press the ENTER key
for 3 sec until SEL is shown in the large digits. The menu can be left by pressing the POWER / ESC button or by not
pressing a button for more than 5 minutes.
Sensor calibration
Start the advanced menu as described above. Select CALH or CALt with the UP/DOWN buttons.
Small digits show CALH (internal humidity sensor calibration) and CALt (temperature setback sensor calibration). The
current calibration value is displayed. Press ENTER and then change the value with the UP/DOWN buttons, and save it
with the ENTER button.
Clock setup (for deluxe versions only)
A blinking clock indicates that the time needs to be set. Time programs will not operate if the time is not defined.
Start advanced menu as described above and select the clock display by pressing the UP or DOWN keys.
The current time is now displayed in the small digits. Press the ENTER button to enter the clock setup. The minute
digits start to blink and can be changed with the UP/DOWN buttons.
Pressing ENTER saves minutes and steps to hours. The hour digits blink now and can be changed with the
UP/DOWN buttons.
Press ENTER again to step to the day setting. DAY1-7 is displayed. Day 1 stands for Monday, Day 2 for Tuesday
and so forth. Select the day according to current weekday.
Pressing ENTER again saves the settings and moves back to the SELECT menu. To leave the setup mode press the
POWER button.
Time schedules (for deluxe versions only)
Four individual time programs (Pro1, Pro2, Pro3, Pro4), each with four switching events, are available. A switching
event changes the controller from one operation mode to another.
Time schedules and their switching events can be individually enabled. Make sure that undefined time schedules and
switching events are disabled.
Enter the advanced menu as described above and select PRO by pressing UP or DOWN buttons. Press the ENTER key.
Pro1 is now shown in the large digits, while the number 1 is blinking. Select time schedule Pro1-Pro4 by using
UP/DOWN keys and pressing the ENTER key.
1) Enable or disable the Pro1 time schedule. Choose ON or OFF with the UP/DOWN keys. The following steps will only
be accessible if ON is selected. OFF disables this time schedule and its switching events.
2) Select day(s) with UP/DOWN. Day 1 stands for Monday, day 2 for Tuesday and so forth. Options are d1-7, d1-6,
d1-5, d6-7, day1, day2, day3, day4, day5, day6, day7. This time schedule will be active during the selected day
or days. Press ENTER to continue.
3) Select desired operation mode below with UP/DOWN, press ENTER to continue
4) Select switching time 00:00 to 23:45 in 15-minute steps with UP/DOWN.
5) Press ENTER to continue and repeat step 3 and 4 for each switching event.
UNI: University mode: This switching mode is used for rooms such as lecture rooms and auditoriums that might be
occupied during a certain time. During this time the reset is not active. The unit will not start itself when UNI mode is
active. It still needs to be manually activated. This is to avoid unnecessary heating or cooling of such rooms while they
are not occupied.
Override reset function: The override reset applies when the unit is manually switched on, while in scheduled off or
ECO mode. The unit will return to the scheduled mode when the reset time defined in UP08 expires.
Setting UP08 to 0 disables the override reset.
Example
From Monday to Friday the controller shall be in Comfort mode between 08:00 in the morning and 18:00 in the
evening. Between 18:00 and 08:00 it shall be in OFF mode. One time schedule with two switching events is required
to achieve this time schedule:
Setting procedure:
Select the desired time schedule (Pro1) with UP/DOWN key,
Press enter, select ON to activate Pro1 with UP/DOWN keys, Press enter,
Select d1-5 (Monday – Friday) with UP/DOWN keys and confirm with ENTER key
Select ON mode with UP / DOWN key and confirm with ENTER
Select the time of the first desired switching event for Pro1 (ON mode) to 08:00 with the UP/DOWN keys;
Press ENTER to conclude this switching event (first of 4 available).
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Duct-Humidistat TDC-BH-U
Parameter
Description
Setting Range
Factory Setting
UP 00
Enable change of operation modes
ON, OFF
ON (Enabled)
UP 01
Enable change of setpoints
ON, OFF
ON (Enabled)
UP 02
Enable access to Time programs
ON, OFF
ON (Enabled)
UP 03
State after power failure:
0 = Switched OFF, 1 = Switched ON, 2 = state before power failure
0, 1, 2
2
UP 04
Enable Economy functionality
ON, OFF
OFF (Disabled)
UP 05
Celsius or Fahrenheit, Select ON for Fahrenheit, OFF for Celsius
ON, OFF
OFF (Celsius)
UP 06
Select contents of small digits in standard mode:
00 = OFF
01 = Setpoint
02 = Humidity Sensor
03 = External Temperature Sensor
04 = Clock
0…5
04 Deluxe:
show clock
01 Standard:
show setpoint
UP 07
New: Resolution 0.5% or 1% RH
OFF = Display resolution is 0.5% RH
ON = Display resolution is 1% RH
ON, OFF
OFF (0.5% RH)
UP 08
Deluxe only
Clock display type:
OFF = Show 24hour clock
ON = Show 12hour clock (AM, PM)
ON, OFF
OFF (24h)
UP 09
Deluxe only
Reset timer for override mode: Only available for deluxe version
0 = Reset of override mode is not active.
1…255 = delay in minutes to return to scheduled operation if the
device is activated while scheduled to be in OFF or ECO
mode.
0…255
60 (Min)
Configuration parameters
The TDC-BH-U is preset to work for most applications. For special requirements it can be fine-tuned to work ideally
with a simple parameter setup routine. The parameters can be changed on the unit without the need of additional
equipment.
Identifying the firmware version
The parameters and functionality of controller depend on its firmware version and revision. It is therefore important to
use a matching product version and parameter set. The Firmware version and revision version can be found when
pressing simultaneously the and keys during several seconds. On the upper 7 segment display, the firmware
version can be found, on the lower 7 segment display the current revision index (or “sub-version”).
Access to parameters
The TDC-BH-U is an intelligent controller and can be adapted to fit perfectly into your application. The control
operation is defined by parameters. The parameters are set during operation by using the standard operation terminal.
The parameters are password protected. There are two levels of parameters: User operation parameters for access
control settings and Expert parameters for control functions and unit setup. The passwords for user levels and expert
levels are different. Only control experts should be given the control parameter password.
The parameters can be changed as follows:
1. Press UP and DOWN button simultaneously for three seconds. The display will indicate the firmware version in
the upper large digits and the revision in the lower small digits. Pressing any key will show: CODE.
2. Select a password using UP or DOWN buttons. Select 009 in order to get access to the user parameters, 241
for controls parameters.
Press OPTION after selecting the correct password.
3. Once logged in, the parameter is displayed immediately
4. Select the parameters with the UP/DOWN keys. Change a parameter by pressing the OPTION key. The MIN
and MAX symbols show up and indicate that the parameter may be modified now. Use UP and DOWN key to
adjust the value.
5. After you are done, press OPTION or POWER in order to return to the parameter selection level.
6. Press the POWER key again so as to leave the menu. The unit will return to normal operation if no key is
pressed for more than 5 minutes.
User parameters (code 009)
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Duct-Humidistat TDC-BH-U
Parameter
Description
Range
Standard
CP 00
Minimum setpoint limit in humidification mode
0…100%
10%
CP 01
Maximum setpoint limit in humidification mode
0…100%
90%
CP 02
Minimum setpoint limit in de-humidification mode
0…100%
10%
CP 03
Maximum setpoint limit in de-humidification mode
0…100%
90%
CP 04
Economy humidity shift:
The comfort (occupied) setpoint is shifted by the value set here. If humidifying
is active the comfort setpoint will be decreased, if dehumidifying is active, the
setpoint will be increased. (Enable with UP04.)
0…100%
10%
CP 05
This parameter is only used if CP10 = 0
Dead zone span:
The Dead Zone Span defines the deviation setpoint to input value required for
the controller to switch from humidifying to dehumidifying or vice versa. The
output is off while the measured value is within the dead zone span. A
negative dead zone is not possible.
0…100%
10%
CP 06
This parameter is only used if CP10 = 0
Delay on humidify – de-humidify change over
0…255 min
5 min
CP 07
Switching Hysteresis
Defines the difference between switching on and switching off an output. A
small hysteresis will increase the number of switching cycles and thus the wear
on associated equipment.
0…100%
3%
CP 08
Delay OFF (Minimum running time) [MM:SS]
Prevents a too short running cycle for the control output by setting a minimum
running time
00:00 to 98:30
00:10s
CP 09
Delay ON (Minimum stopping time) [MM:SS]
Prevents a too short running cycle for the control output by setting a minimum
stopping time
00:00 to 98:30
00:10s
CP 10
Configuration of control mode
0 = Both Humidification and de-humidification
1 = W04 = Humidification only
2 = W05 = De-humidification only
0 - 2
TDC-BH-U: 0
TDC-BH-U-W4: 1
TDC-BH-U-W5: 2
CP 11
Enable fan (only if CP 10 ≠ 0)
ON, OFF
TDC-BH-U: OFF
TDC-BH-U-W4:
ON
TDC-BH-U-W5: ON
CP 12
Start delay for fan [MM:SS]
(Time the fan runs before control output starts)
00:00 – 98:30
00:10
CP 13
Stop delay for fan [MM:SS]
(Time the fan keeps running after control output stops)
00:00 – 98:30
01:30
System type
CP10
CP11
DO1
DO2
Humidify and de-humidify
0
OFF
Humidifying
Dehumidifying
Humidify only
1
OFF
Humidifying
OFF
Humidify with fan
1
ON
Humidifying
FAN
De-humidify only
2
OFF
OFF
Dehumidifying
De-humidify with fan
2
ON
FAN
Dehumidifying
Controls Output
Fan Output
Demand
CP12
CP13
Time [s]
Control functions (code 241)
Warning! Only experts should change these settings! See user parameters for login procedure.
Controls configuration
Output configuration
Control logic TDC-BH-U
Fan delay
Once there is an output demand, the humidistat will first activate the fan, wait the required start delay time (CP12)
and then activate the control output. This will ensure stable air for humidification or de-humidification.
The control output will be switched off when the setpoint is reached. The fan keeps running until stop delay (CP13) has
expired. This will ensure that no left over humidity remains in the device or its ducts.
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Duct-Humidistat TDC-BH-U
CP 14
OFF = Temperature setback is disabled
ON = Temperature setback is enabled
ON, OFF
OFF
CP 15
Setpoint limit at full setback
0…100%
20%
CP 16
Lower temperature limit:
Outside temperature with maximum setback
The setpoint will be equal to the minimum setpoint limit
-40…60°C
-40…160°F
-30°C (-22°F)
CP 17
Upper temperature limit:
Outside temperature at begin of setback.
-40…60°C
40…160°F
0°C (32°F)
CP 18
Number of seconds taken into account to calculate the
averaging input signal.
Low value = fast response
High value = slow response
0…100
10
Temperature setback
T [°C, F]
CP16
CP17
CP15
Setpoint
W
Input configuration
Temperature setback (TSET)
Shift the humidity set point towards a defined TSET setpoint CP15 depending on the outdoor temperature.
Temperature setback becomes active when the outside temperature drops below the activation limit of temperature
setback CP17. The full temperature setback is reached when the temperature reaches the full limit CP16. The actual
set point will in this case be equal to the TSET setpoint.
Temperature setback may be enabled with CP14.
Averaging function of input signal:
The averaging function is used to prevent unwanted fluctuation of sensor signals. The controller measures every
second the signal inputs. The input signal is built over a number of measured values. Select how many values should
be used to calculate the averaging signal. Control speed will slow down when a large number of samples are used for
an averaging signal. This should be taken into account when defining the control parameters.
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