Honeywell DTC 100/2 Operating and maintenance manual

DTC 100/2
1
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
2
DEAR CUSTOMER
We congratulate you on your choice.
By purchasing the differential thermostat DTC... you have selected a product, that com-
plies 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.
2

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 (collec-
tors, 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 surface-
mounted 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
Installation of T2 into a specially
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

DTC 100/2
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ELECTRICAL CONNECTION
The grounding cables
are to be connected to
the specially designed
terminals, to the right of
the coupling terminals.
NOTICE
The thermostat is designed to be fastened permanently. While putting in the electrical
installation, it is necessary to insert an safety element to allow the thermostat at least
a 3mm - distance from the mains (a switch or a power cord). For any repairs inside the
thermostat, it must be fully disconnected from the mains.
TECHNICAL DATA
Supply voltage ............................................230V 50Hz +/- 10%
Power consumption ....................................4 VA
Pump relay rating .......................................3A/230VAC cos 0,6
Type of thermostat ......................................P
Max. temp. of water ....................................100°C
Interval of operation ....................................10 - 90°C
Setting the difference ..................................5 - 15K
Hysteresis of the thermostat .......................1 - 2K
Nr. of sensors .............................................2
Nr. of outputs. .............................................1 (230 VAC reversing SPDT )
TERMINAL CONNECTION
1,2 sensor T1 - sensor of the source (collector) KF, silicon, 2x0.25 mm2 ,
2 m long, with two spring ribbons and one angle clamp, orange
3,4 sensor T2 - DHWS sensor, 2x0.34mm2 1.5 m long, gray
12 phase (L) for closing the electrically actuated motor valve (EMV 110)
13 neutral connector (N)
14 phase (L) of the pump, i.e. opening of the electrically actuated motor
valve (EMV 110.., find in our production line)
15 L - phase, mains connection 230 V, 50 Hz.
16 N - neutral, mains connection 230 V, 50 Hz.

DTC 100/2
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DESCRIPTION OF THE FRONT PANEL ELEMENTS
LEGEND :
1 - The switch for manual control (selection of a mode of operation)
2 - Button for adjustment of the temperature of the water in the DHWS
(operates only when the gliding switch (1) is in position AUTO.)
3 - Potentiometer for the adjustment of the switching off temperature difference be
tween the DHWS and the source of heating. (recommended setting is between 5
and 10K)
4 - LED to signal operation
USE OF THE MANUAL CONTROL SWITCH
0 No matter what the value of the temperature is, the pump
is off, the valve remains closed.
AUTO Thermostat operates automatically (normal operation)
1 No matter what the value of the temperature is, the valve
remains open, the pump keeps operating.

DTC 100/2
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Setting the temperature in the DHWS
By turning the right button (2) on the cover of the thermostat, you can set the maximum
temperature of the water in the DHWS (Domestic Hot Water Storage) between 10 and
90°C. When the set temperature is achieved, the thermostat closes the valve and turns
off the pump. This allows connection of appliances using hot water while operating, such
as the washing machine and the dish-washing) While using this option, attention needs to
be paid to the allowed input temperature of the water, as prescribed by the manufacturer
for each individual appliance.
WARNING:
If heating the water in a system including a heat pump, it is necessary to consult the
heat pump manufacturer concerning the appropriate coupling. It is forbidden to switch on
the thermostat, where this, provided that the temperature of the water is risen, turns the
compressor off.
With the appliances using hot water, additional protection against overheating is required,
which is to close the supply of water in case of thermostat failure.
Setting the temperature difference (the switching difference)
The temperature difference between the source of heating and the consumer (the DHWS)
is set to the value required by the mechanical part of the installation by means of a screw-
drive and the potentiometer (3) on the cover of the thermostat.
When using collector heating this difference is between 5 and 10 K, depending on the
length of the tubes and the quality of their insulation. If the tubes connecting the collec-
tors with the boiler are insulated and their total length does not exceed 15 meters, the
difference can be 5 K, whereas it needs to be increased in proportion to their length and
poorer insulation.

DTC 100/2
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Basic coupling with a pump controlled by an electric
motor actuated ball valve ( EMV 110 series 800)
When the conditions required for the boiler to star heating are met, the EMV 110 series
800 opens. The pump however, is put into operation only when the valve is open.
Electrical connection
DTC
Differential thermostat
DTC 100/2
T1, T2
Sensors
T1 - sensor located in the collector
T2 - sensor located in the DHWS
P
P - circulation pump
EMV
Electric motor actuated ball
valve:
EMV 110.. series 800
EMV 110.. series 801
MV 110..compact

DTC 100/2
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Example of coupling with a pump.
In this case it is necessary to connect behind the pump a non-return valve to avoid unwanted
circulation of water.
Electrical connection
DTC
Differential thermostat
DTC 100/2
T1, T2
Sensors
T1 - sensor located in the collector
T2 - sensor located in the DHWS
P
P - circulation pump
Non-return valve

DTC 100/2
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Basic coupling with a pump controlled by the electri-
cally actuated motor ball valve EMV 110 series 800.
It is used in cases which require temperature regulation of sanitary water in the classical
oil or solid fuel powered boiler. When the conditions which require heating of the DHWS
(Domestic Hot Water Storage) have been met, the valve EMV 110 series 800 opens , but
the pump is put into operation only when the valve is open.
DTC
Differential thermostat
DTC 100/2
T1,T2
Sensors
T1 - sensor located in the collector
T2 - sensor located in the DHWS
P
P - circulation pump
EMV
Electric motor actuated ball
valve:
EMV 110.. series 800
EMV 110.. series 801
MV 110..compact
Electrical connection

DTC 100/2
11
An outline of borehole positions - to facilitate the installation
of the differential thermostat upon the wall.

DTC 100/2
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Most frequently occuring failures
PROBLEM POSSIBLE FAILURE ELIMINATION
No matter what the
temperature is, the
pump never operates
- there is no mains voltage
- the switch is in 0-position
- short-circuited DHWS sensor
- short-circuited collector
sensor
- check the mains voltage
- put the switch into AUTO
position
- check the sensors
No matter what the
temperature is, the
pump keeps operating
- the switch in position 1
- disconnected collector sensor
- short-circuited DHWS sensor
- put the switch into
position AUTO
- check the sensors
Temperature limits do
not work
- the motor actuated ball valve
remains open, the closing flap
stays open (termal circulation
of water is possible)
- check the machine
installation
Despite the warmness
of the collectors, the
sanitary water is cool
or not warm enough
- the setting of T2 is too low
- the difference is set too high
- check the settings