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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
DTC 200 (3 sensors)
2. Heating the domestic hot water from one heating source
(solar collectors, boilers, heat pump...) in two water tanks - DTC
200/ (3 sensors).
2.1 Basic
In this case of use is DTC200 in function of double differential
thermostat. It is used for heating the domestic hot water in two
water tanks from one heating source. This is convenient in cases
when one water tank cannot accumulate whole energy from
solar collectors. At weakly sunny days is assured enough heated
water. Differential thermostat controls circulation pump and
changeover motor valve for diverting or two motorised ball valves
and two pumps for each water tank.
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 heating source
(T1) and exchanger (T2) from 0K to 15K.
With these regulation 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
Electric connection for examples 1 and 2
8 (2W) - Electric motor actuated ball valve
EMV 110..series 602, 502
6(1)A, 250V
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!
ELECTRIC CONNECTION
the thermostat opens the valve and activates the pump.
The difference is set in relation to the volume of heat losses of
the system which depend on lengths of pipelines from source
to hot water tank and on pipeline insulation.
2.2 Operation
DTC 200 double differential thermostat measures the tempera-
ture of heating source (collectors, boiler, ...) and in two users
(hot water tank).
One of users has priority. Usually is smaller water tank or upper
exchanger.
When the temperature is achieved, differential thermostat
changeover heating to second user - second water tank, lower
exchanger, swimming pool …
Differential makes changeover also in following cases:
1. Temperature of water in first water tank is achieved
2. Temperature of water in second water tank is lower than
preset temperature
When the temperature in both water tanks is achieved, the pump
is switch off.
The thermostat switches off the pump if pre-set temperature is
reached in both hot water tanks (adjustable from 10° to 90°C).
For this way of use you need three sensors (T1, T2 and T4). One
is mounted in solar collector other two in upper third of indi-
vidual exchangers in hot water tanks.
Sensors T1 and T2 are designed for controlling first heating
circuit, which heats water in smaller water tank.
Sensors T1 and T4 are designed for controlling secondary heat-
ing circuit, which heats water in larger water tank or swimming
pool.
Sensor T1 is collector's sensor.
example: 2
Heating sanitary water with solid fuel boiler.
6(1)A, 250V
TERMINAL CONNECTION
1,2
sensorT1 – heating source (collector, boiler, …)
2,3
sensor T2 – primary hot water tank
4,6
sensor T4 – secondary hot water tank
11 N
-
neutral
12
L - phase – secondary heating circuit 6(1)A,
250V , 50Hz
13 N
-
neutral
14
L - phase – primary heating circuit 6(1)A,
250V , 50Hz
15
L – phase mains 230V , 50Hz
16
N – neutral mains 230V , 50Hz