Honeywell DTC 100/2 User Manual Instructions For Installation And Maintenance
DTC 100/2
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Differential thermostat for solar system
and combined multi-source heating
DTC 100/2
User manual
Instructions for installation and maintenance
ID-2106-04-DTC100-2-Honey-170100.indd
DTC 100/2
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DEAR CUSTOMER
We congratulate you on your choice.
By purchasing the differential thermostat DTC... you have selected a product, that complies with all the most recent quality and safety standards. It includes state-of-the-art
knowledge of how to harness solar energy and other alternative sources for water heat
ing purposes in homes and offices. We are convinced that you will find using our product
highly cost-efficient.
Thanks for your trust,
THE KIT INCLUDES:
1. Differential thermostat DTC 100/2
2. Sensor T1 with a silicon conductor for the collectors
3. Sensor T2 with a PVC conductor for the DHWS
4. A clamp with two fastening springs - to fasten the sensor
5. Instructions for use
6. Warranty card
In case any of these are missing or damaged, demand your seller to supply you with a
replacement !
Read these instructions carefully, as this will allow you to benefit from all the possibilities
offered by this product.
NOTICE
The examples of how to use the DTC/2 listed in this booklet are only schematic. We accept
no responsibility for incorrect hydraulic coupling of the mechanical part of the installations.
The mechanical installations must, as well as the electrical ones, comply with all the safety
regulations prescribed by the law and the regulation books.
We reserve the right to modify the instructions and the technical data of the product
without prior notice.
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DTC 100/2
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GENERAL INFORMATION
DTC 2 is a single differential thermostat designed for heating water in homes and offices
from one source. (solar collectors, hot water boilers, heat pumps, etc.)
The thermostat controls one pump or electrically actuated motor ball valve.
The thermostat allows setting two parameters, that is:
1. Setting the maximum temperature in the DHWS (Domestic Hot Water Storage) between
10°C and 90°C. This temperature is determined by sensor T2, which is usually installed
in the upper third of the exchanger.
2. Setting the difference between the temperature in the boiler and the source of heating
(collectors). It can be set between 5 and 15 K. By means of this setting we define, by how
many degrees the temperature of the source of heating needs to exceed the temperature
of the water around the exchanger in the DHWS in order to start the operation of the valve
and put the pump into operation. The setting of the difference depends on the amount of
temperature losses on the system. These losses mainly depend on the length and the
quality of the insulation of the tubes leading from the source to the DHWS.
OPERATION
Single differential thermostat DTC 100/2 measures the temperature in the source (collectors, the stove) and in the consumer (DHWS).
In order to achieve heating effects, the temperature of the heating body (the heater in
the boiler) needs to exceed the temperature of the water in the consumer (the boiler) by
at least 3 to 5 K. This is why the minimum adjustable difference is 5 K (factory setting).
When the temperature in the source exceeds the temperature of the water around the
exchanger in the consumer, the thermostat opens the valve (EMV), or actuates the pump
and closes the valve, or switches off the pump when the difference in temperature is lower
than 3 to 4 K.
The thermostat de-activates the pump also in the case when the achieved temperature
of the water in the boiler equals the pre-set temperature (adjustable between 10 and
90°C).
The kit includes two sensors (T1 and T2), of which one is installed into the heating source
and the other into the upper half of the exchangers in individual boilers.
ADVANTAGES
* The adjustable temperature difference between the source and the consumer is within 5
and 15 K.
* Potential output with a reversing contact SPDT ( ) 230V, 50Hz.
* The setting of the required temperature in the consumer (DHWS) is between 10 and 90°C.
* The system is supported either by a circulation pump or by an electrically actuated motor
ball valve.
* Manual control is provided to allow for operation checks if required, or to be used in the case
of a sensor breakdown.
* The thermostat can be completely turned off.
DTC 100/2
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INSTALLATION OF THE SENSOR INTO THE COLLECTOR
Sensor T1 is inserted as an immersion sensor into the immersion tube provided on the
upper side of the collectors (figure A). The sensor is connected to clips 1 and 2. To lengthen
the cable up to 50m you can use the 2x0.75 mm2 standard cable. It is recommendable,
to allocate a VDR resistor (Figure B) to the point where the cable of the sensor and the
lengthening cable join to prevent sudden jumps of voltage (due to lightening strokes, for
example). For greater lengths or in the areas where lightening strikes are more likely to
happen, it is advisable to use an armoured cable, where the armoured coating is connected
to the grounding terminals.
INSTALLATION OF THE SENSOR INTO THE BOILER
Sensor T2 must be fixed to the provided location in the DHWS (Domestic
Hot Water Storage) or to the DHWS wall below the insulation as a surfacemounted sensor in the upper half of the exchanger. If the sensor is installed
in the surface-mounted way, it is advisable to lubricate it beforehand with a
heat conducting grease or liquid metal.
direction of
the current
T item 1/2”
immersion
tube 1/2”
VDR resistor
thermo-shrinkable
tubes
lengthening
cable
cable of the
sensor
Install ation o f T2 into a speciall y
provided vertical or horizontal tube
(protect the sensor against unwanted
extraction)
Installation of T2 upon the boiler by
means of a clamp and a spring ribbon.
(use glease for better conductivity of
heat.
Installation into a specially
designed lateral tube
(protect from unwanted
extraction)
INSTALLATION OF THE THERMOSTAT
The thermostat is fastened upon the coat of the DHWS (Domestic Hot Water Storage) or to
its immediate neighbourhood. By simply using the outline of the boreholes drawn on page 11
of this booklet, the thermostat can easily be fastened to the wall in the heating room. Do not
fasten the thermostat below tube joints or valves to avoid water dropping on its housing.
figure: A figure: B
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