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Operating Instructions
Differential Temperature Control Module
Item No. 1839931
Intended use
The differential temperature control module can be used for many regulating applications for heating
systems. Typical use for this product is controlling circulation pump in various kinds of heating systems,
including solar heating systems.
For safety and approval purposes, you must not rebuild and/or modify this product. If you use the product
for purposes other than those described above, the product may be damaged. In addition, improper use
can result in short circuits, fires, electric shocks or other hazards. Read the instructions carefully and store
them in a safe place. Make this product available to third parties only together with its operating instructions.
This product complies with the statutory national and European requirements.
All company names and product names are trademarks of their respective owners. All rights reserved.
Features of the differential temperature control module
• Connection of two temperature sensors (included with the product)
• Two conditional rules for activating the output:
- Condition #1: minimum temperature on Sensor 1 must be above specified Limit (0...100°C)
- Condition #2: temperature on Sensor 1 must exceed temperature on Sensor 2 by at least specified
Limit (0..20°C)
• Manual mode for controlling the output without need to change limits
• Easy adjustment of limits using rotary knobs
• Digital signal processing with microcontroller using analog/digital conversion for measuring signal inputs.
Up-to-date Operating Instructions
Download the latest operating instructions at www.conrad.com/downloads or scan the
QR code shown. Follow the instructions on the website.
Explanation of symbols
The symbol with the lightning in the triangle is used if there is a risk to your health, e.g. due to an
electric shock.
The symbol with the exclamation mark in the triangle is used to indicate important information in
these operating instructions. Always read this information carefully.
Safety instructions
Read the operating instructions carefully and especially observe the safety information.
If you do not follow the safety instructions and information on proper handling in this
manual, we assume no liability for any resulting personal injury or damage to property.
Such cases will invalidate the warranty/guarantee.
• The handling of products operating with electric current requires you to follow the rules from
VDE such as VDE 0100, VDE0550/0551, VDE 0700, VDE 0711 and VDE 0860 or other local
rules in your country.
• These modules are not designed and authorized for use in life support or life saving
applications! Do not use the product for applications in which a temporary or permanent failure
or malfunction could cause damage to persons or propery.
• If the module is used to switch currents greater 24V it is necessary to have the installation
done with no voltage applied and performed by a trained professional authorized for such
work. The module may only be used in such application if it was installed in a safe to touch
enclosure.
• The module must only be used in dry and clean environment. The use near water, heavy dirt
and/or high humidity is dangerous and not permitted.
• The product must not be used in conjunction with any type of flammable liquid or gas or other
environment with risk of spark triggered explosions.
• Never exceed the limits or ratings listed in the 'Technical Data' section at the end of this user
guide.
• If the module is used in schools or educational facilities or similar institutions the operation
must be supervised by trained and authorized staff.
• The product itself and all parts thereof (including packing material) are not suitable toys for
childern! (choking hazard, risk of electric shock, ...)
Operation
a) Manual control of the relay output
button 'Manual Override'
LED activity
press about 0.5 sec.
yellow on / red on
again press about 0.5 sec.
yellow on / red off
again press about 0.5 sec.
yellow off or blinking
The manual override mode can be recognized by the yellow LED being permanently lit and the red LED
shoing the state of the output.
b) Normal operation mode
• In normal operation mode two conditions are continuosly checked:
- does the temperature on sensor 1 exceed the preset limit
- does the difference of the temperatures on both sensors exceed the preset limit (sensor 1 needs to be
warmer than sensor 2)
• If both conditions are met, the relay output is activated
c) Temperature limit on Sensor 1
The upper dial is used to set a temperature limit from 0...100°C for minimum temperature on Sensor 1. In
normal mode it can be seen thru LED status if the condition is met or not.
led blinking
temperature does not exceed limit
temperature does exceed limit
d) Temperature difference between Sensor 1 / 2
The lower dial is used to set a minimum limit for the temperature difference between both sensors in 0...20°
range. In normal operation mode the LED status will show if the condition is met or not.
temperature difference T1-T2
difference smaller than preset limit
difference is greater than preset limit
For use of this module with the modular casing a special knob to fit on the switch plunger is included with
this product.
The modular casing grants the touch safe enclosure which is required if the module is to be used with mains
current.
The modular casing comes with mounting clips to attach the case on standardized DIN-mounting rails with
30 mm width.
The connection to the sensors can be extended as needed but the maximum cable length should not exceed
15 meters for reliable operation.
e) Deactivation of condition checking
For both conditions to be checked it is possible to deactivate the limit checking by setting the dial all the way
to the left (0°C position).
In this case the limit is not set ot 0°C but this condition considered true without checking the sensor readings.
If both knobs are set to the left limit, both conditions are considered true without reading the sensors and
the relay will be activated.
Assembly of the rotary knobs on the module
To to install the rotary knobs on the module with correct orientation of the arrows it is recommended to first
turn both potentiometers all the way to the left firstly, removing the knobs again and re-insert with arrow
pointing at 'zero' position as shown on the printed front panel.
The differential temperature control module is designed to fit perfectly into the modular casing available with
order number BN 1840878.
A printed and cut to shape front panel to fit on the case is supplied with this product.
Picture with optional modular case order BN 1840878.
Disposal
Technical Data
Dimensions ........................................... 50 x 51 x 22 mm
Input power ........................................... 9 – 12 V/AC / 12 – 15 V/DC / max. 60 mA
Contact rating ....................................... 250 V/AC / 5A
function
Sensor .................................................. 2 x NTC 5 kOhm @ 25 °C B
Allowed temp. ....................................... 0 to +40 °C (non-condensing)
override ON
override OFF
normal mode
This is a publication by Conrad Electronic SE, Klaus-Conrad-Str. 1, D-92240 Hirschau (www.conrad.com). All rights
including translation reserved. Reproduction by any method, e.g. photocopy, microfilming, or the capture in electronic data
processing systems require the prior written approval by the editor. Reprinting, also in part, is prohibited. This publication
represent the technical status at the time of printing.
Copyright 2018 by Conrad Electronic SE.
yellow LED activity
LED blinking
LED off
red LED activity
red LED blinking
red LED off, yellow blinking OR red LED on, yellow LED
off, relay active
The input terminals for the signaling lines must not be connected with any other voltage source!
Electronic devices are recyclable waste and must not be disposed of in the household waste.
At the end of its service life, dispose of the product in accordance with applicable regulatory
guidelines.
You thus fulfill your statutory obligations and contribute to the protection of the environment.
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