General Information; Operation - Honeywell DTC 100/2 User Manual Instructions For Installation And Maintenance

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 (
* 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.
) 230V, 50Hz.
DTC 100/2
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