First EMV100 800 Series Manual page 61

DTC 100/4 TD
GENERAL
DTC 100/4TD is a microprocessor aided double differential thermostat, designed for
heating of domestic water from two heating sources (collectors, boilers, heat pumps,...),
using its logic of additional energy source switching on (boiler of central heating system).
The thermostat controls two pumps or two motors actuated ball valves (EMV 800...) and
one burner or electric heating element.
The thermostat enables regulation of four parameters, i.e.:
1. Regulation of maximum temperature in hot water tank from 10 to 90°C.
2. Regulation of difference for higher exchanger from 2 to 15K (after-heating circuit)
3. Regulation of difference for lower exchanger from 2 to 15K (collector circuit)
4. Setting two working regimes - C.n.b (normal) and C.d.t. (switching off the limitation of
boiler temperature for collector circuit).
With first two regulation options you define how much the value of the source tem pera ture
(collector, boiler,...) should exceed the temperature of water around the exchanger in hot
water tank, that the regulator activates the pump or opens the valve.
The difference is set in relation to the volume of heat losses of the system which depend
on lenghts of pipelines from source to hot water tank and on pipeline insulation.
Built-in digital display enables prompt reading of the temperatures of individual sensors
and of all set values as well.
OPERATION:
DTC 100/4TD double differential thermostat measures the temperature of two heating
sources (collectors, boiler, ...) and of two spots in user (hot water tank). Heating effect is
provided, when heating unit (heating element in hot water tank) exceeds the temperature
of the user (water in hot water tank) for at least 3 - 5K. Consequently minimum ad justable
difference is 2K (factory set to 5K).
When the temperature of the source exceeds the temperature around the exchanger for
at least 5K, the thermostat opens the valve (EMV...) or activates the pump; it closes the
valve or stops the pump, when temperature difference is one degree lower than pre-set value.
The thermostat also switches off a pump if pre-set temperature is reached in hot water
tank (adjustable from 10 to 90°C).
If gas flow boiler, oil boiler or electric heating element (which is switched off during summer
seasons), is connected to after-heating circuit, the regulator can switch on the boiler by
means of the third output, if domestic water is to be additionally heated by means of after-
heating circuit. In summer seasons a few days of cloudy weather can appear or use of
domestic water increases. In such cases domestic water is to be after-heated from additional
source (central heating system boiler or electric heating el ement). Classic differential
thermostat would require hot boiler throughout the year, which is not recommended from
ecological and economic point of view. DTC 100/4TD, with its third additional output, enables
activation of after-heating source. When after-heating of wa ter is required, regulator first
switches on the burner of the boiler and when the condition of difference for after-heating
circuit is also assured (pre-set difference of boiler has higher temperature than hot water
tank), pump is switched on.
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