Operation Manual

11
Non-observance of the aforementioned requirements results in cancellation of the undertaking for
the damaged components!
♦ Choice of the regulating and controlling components
The boiler is fitted with basic regulatory and safety elements as the following electric diagrams show.
Therm-EL boilers can regulate their outputs. They are equipped with their own PID regulation which does not
allow heating over the set temperature. Even if the TOP temperature is set to 80°C, electric boilers frequently
overheat up to the temperature of 96°C, while THERM-EL boiler heats up to the maximum temperature of
84°C.
It is always suitable and economical to let the electric boiler be controlled by a superior regulatory element
(room thermostat or an OpenTherm communication regulator). These regulators are not included in the boiler
delivery package!
Connection of a room thermostat and servicing of the boiler electric section may be carried out only
by authorized service organizations!
Regulation based on temperature in a referential room (room regulator) or an equitherm regulation of the
heating water, or potentially both, can be used as further extensions to the regulatory option. A whole series of
regulatory or switch thermostats can be used to control the room temperature: E.g. PT 10, PT 21, PT 30, BPT
30, PT 30 GSM, REV 23, CM 707, CM 907 or OpenTherm communication regulators such as Therm RC 03,
PT 55 (Elektrobock), QAA 73.110 (Siemens) or CR 04 Honeywell.
Regulators (room regulator, water temperature thermostat, trip relay of the current value monitor or an
OpenTherm regulator) can be connected to the boiler's input terminals (24V= circuits).
Current value monitor is a device used for disconnecting or reducing the output of the electric boiler when
other high power input electrical appliances (e.g. flow-through water heater, washing machine, dish-washer,
stove etc.) are connected to the network. Such a device is rules out the necessity of purchasing a high-capacity
main circuit-breaker which also means the payment of a high lump fee.
If a part of the electric boiler needs to be disconnected, the tripping device becomes connected to the
terminals for a trip relay (see the wiring scheme). The output size which becomes disconnected by individual
trip relays is set by changing the parameters in the control panel (from zero to maximum) in the service menu.
If the contact of the external tripping device should disconnect the whole boiler, it shall be either connected
serially in combination with the room thermostat (24V=) or to the terminals of the blocking element
(230V/50Hz).
Equitherm regulation
Heating water temperature in the equitherm regulation system is controlled on the basis of outdoor temperature.
The regulation takes place according to equitherm curves which specify the dependence between outdoor
temperature and the temperature of heating water required to reach the desired room temperature. An equitherm
curve must be drawn on the basis of designed, calculated or measured heat losses of the building. This type of
regulation does not have any feedback which would take into account higher cooling on one side of the house
by wind or heating by sun and, as a result, it cannot safeguard accurate temperature regulation in all parts of the
house.
Boiler connection to room thermostat and Therm Q01 outdoor sensor enables utilizing the equitherm regulation
which leads to additional energetic cost-cutting. THERM-EL boiler is moreover capable of cooperating with
OpenTherm communication interface regulators without any further communication interface installation.
The inclination and shifting of equitherm curves can be modified in the automatic control user menu.