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
6
DTC 200/2G
SENSORS INSTALLATION IN HOT WATER TANK:
Install T2 sensor to provided place in hot water tank or on hot water
tank wall under isolation as contact sensor in upper part of exchanger.
When sensor is mounted as contact one we recommend to coat it
with heat conducting paste or liquid metal.
In special purpose vertical or horizontal tube
(sensor should be protected against accidental
extraction).
On hot water tank with clip, wire and spring strip
(use paste for better heat transmission).
WARNING!
At mounting protect sensors against atmosphere influence
and assure suitabile mechanical protection.
Grounding wires should be connected to special terminal
pins situated on left side of terminal strips.
The thermostat is designed for fixed installation. When
performing electric installation, 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.
ELECTRIC CONNECTION
Before each intervention in the thermostat first
disconnect the main power!
2. HEATING THE DOMESTIC HOT
WATER FROM ONE HEATING
SOURCE (SOLAR COLLECTORS,
BOILERS, HEAT PUMP...) WITH AD-
DITIONAL HEATING WITH ELECTRI-
CAL HEATER.
Differential thermostat controls the electric motor actuated ball
valve (EMV 110..) and the circulation pump. In case that the
primary heating source (solar collectors, boilers...) has not
enough energy, water in water tank is after-heated with electrical
heater.
2.1 BASICS
The thermostat enables setting two parameters:
1. Regulation of maximum temperature in hot water tank
from 5° to 85°C.
This temperature is defined by T2 sensor witch is generally
mounted in upper third of heat exchanger.
2. Regulation of difference for exchanger from 0K to 15K.
With these regulation you define how much the value of the
source temperature (collector, boiler,...) should exceed the
temperature 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 which depend on lengths of pipelines from source
to hot water tank and on pipeline insulation.
2.2 OPERATION
DTC 200/2G single differential thermostat measures the
temperature of heating source (collectors, boiler, ...) and in user
(hot water tank).
Heating effect is provided, when heating source temperature is
higher than the temperature of the user (water in hot water
tank). Consequently minimum difference should be 3K-5K.
Recommendable minimal value is 5K.
When the temperature of the source exceeds the temperature
around the user for pre-set difference opens the electric motor
actuated ball valve and switches the pump.
The thermostat switches off the pump if pre-set temperature is
reached in hot water tank (adjustable from 5° to 85°C).
If it's need for heating the hot water tank and the temperature of
heating source (boiler) is to low, then thermostat switch on
electrical heater. Electrical heater after-heats water to desire
temperature.
Electrical heater is active, when the primary heating source is
inactive - they never work at same time. Priority has main heating
source (collector, boiler, ...).
2.3 SENSORS INSTALLATION
Install it as immersion sensor in collecting pipe at the top of the
collectors or boiler in provided sleeve. Connect sensor on the
terminals 1 and 2. Use the cable J-Y (St) 1X 2X0,6.
For cables longer than 15m we recommend over-voltage
protection with VDR resistor. For over voltage protection is
recommended use of armoured cable and it must be earthed.
flow direction
T-piece 1/2”
pipe1/2”
VDR resistor thermo-shrinkable
tubes
extension cable
sensor cable
TERMINAL CONNECTION
1,2
sensorT1 - heating source (collector,boiler…)
3,4
sensor T2 - hot water tank
11
N - neutral - el. heater
12
L - phase - el. heater, 6(1)A, 250V , 50Hz
13
N - neutral pump
14
L - phase - pump 6(1)A, 250V , 50Hz
15
L - phase mains 230V , 50Hz
16
N - neutral mains 230V , 50Hz
6(1)A, 250V