7
DTC 200
FIRŠT-ROTOTEHNIKA, s.p., Radegunda 54, SI-3330 Mozirje, Slovenija
tel. +386 3 898 35 00, fax. +386 3 898 35 35, e-mail: [email protected], http://www.rototehnika-sp.si
3.3 ELECTRIC CONNECTION
6(1)A, 250V
DTC 200 (4 sensors)
3. Heating the domestic hot water from two heating sources
(solar collectors, boilers, heat pump...) in one water tank - DTC
200 (4 sensors).
In this case of use is DTC200 in function of double differential
thermostat. It is used for heating the domestic hot water in one
water tanks from two heating sources (collector-boiler or col-
lectors east-west). Differential thermostat controls motorised
ball valves and pump for each heating circuit.
3.1 Basics
The thermostat enables setting two parameters:
1. Regulation of maximum temperature in hot water tanks from
10° to 90°C.
This temperature is defined by T2 and T4 sensors witch are
generally mounted in upper third of heat exchangers.
2. Regulation of temperature difference between primary heat-
ing source (T1) and exchanger (T2) from 0K to 15K.
3. Regulation of temperature difference between secondary
heating source (T3) and exchanger (T4) from 0K to 15K.
With these regulations you define how much the value of the
source temperature (collector, boiler...) should exceed the tem-
perature of water around the exchanger in hot water tank, that
the thermostat opens the valve and activates the pump.
The difference is set in relation to the volume of heat losses of
the system that depend on lengths of pipelines from source to
hot water tank and on pipeline insulation.
3.2 Operation
DTC 200 is double differential thermostat measures the tem-
perature of two heating sources (collectors, boilers,…) 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 for set difference.
When the temperature of the source exceeds the temperature
around the exchanger for set difference, the thermostat opens
the valve (EMV110..) and activates the pump.
Thermostat closes the valve and switch of pump, when tem-
perature difference is lower than pre-set value. Thermostat also
switches off a pump if pre-set temperature is reached in hot
water tank.
When pump operates for primary heating circuit (collectors),
operation of after-heating circuit is prevented. This assures
maximum energy savings during seasons and this also the
main role of solar systems.
For those applications you need four sensors. Two of them are
mounted into individual heating sources and two into upper
half of individual exchangers in hot water tank. T1 and T2 are
designed for primary (main) heating circuit which heats entire
quantity of water in hot water tank (lower exchanger), where T1
is a sensor of heating source (generally collectors) and T2 is a
sensor in lower part of hot water tank. T3 and T4 are designed
for additional, i.e. after-heating circuit which additionally heats
water in hot water tank (upper exchanger). T3 is a sensor of
heating source (generally boiler) and T4 is a sensor in upper
part of hot water tank.
Grounding wires should
be connected to special
terminal pins situated on
left side of terminal strips.
The thermostat is
designed for fixed
installation. When per-
forming electric installa-
tion, an element should be
inserted which enables at
least 3 mm separation of
thermostat from the mains
(switch or socket). Prior to
each intervention in the
thermostat, first disconnect
it from the mains.
Before each intervention in the thermostat first discon-
nect the main power!
TERMINAL
CONNECTION
1,2
sensorT1 – primary heating source (collector, solid
fuel boiler, …)
2,3
sensor T2 –hot water tank
4,5
Sensor T3 – secondary heating source (boiler,…)
4,6
sensor T4 – secondary hot water tank
11 N
-
neutral
12
L - phase – pump for primary circuit
13 N
-
neutral
14
L - phase – pump for secondary circuit
15
L – phase mains 230V , 50Hz
16
N – neutral mains 230V , 50Hz