Thermia iTec Eco, Руководство пользователя

Страница: 8 / 32

Warning
There is an outdoor temperature sensor on
the back side of the outdoor unit. It is of ut-
most importance that it is not tampered with
or moved. That could cause the defrost func-
tion to fail and inflict damage to the unit.
3.1.4 Cooling
Cooling function is started by the indoor control unit and is primarily temperature controlled. The house's heat-
ing system is cooled by transferring heat to the refrigerant circuit, which is then given off in the air heat ex-
changer of the outdoor unit.
If the hot water heater is installed, the control unit will alternate between cooling and hot water production
with prioritisation for the hot water requirement.
3.1.5 Auxiliary heat
The auxiliary heater is included in iTec Plus, iTec Compact, iTec Total and iTec Total EQ. An auxiliary heater con-
sists of an immersion heater, which is located on the supply line before the reversing valve.
If in AUTO mode, the auxiliary heater automatically starts when the heat demand is greater than the heat
pump’s capacity.
Immersion heaters in iTec Plus, iTec Compact, iTec Total and iTec Total EQ intended for 400V supply have three
heating elements (IMM.HEAT 1, 2 and 3) and can be controlled in five power stages.
Products for 230V have two heating elements (IMM. HEAT 1 and 2) and are controlled in three power stages.
The two stages 4 and 5 cannot be engaged when the compressor is in operation as opposed to 4 and
+5 where it is possible.
3.1.6 Heating system flow control
A heating system requires certain conditions in order to be able to run as efficiently as possible. The tempera-
ture difference between the heating system's supply line and return line should strive to be between 5–10°C. If
the difference is greater or less, the heat pump is less efficient and savings are lower.
The speed controlled circulation pump in iTec Plus, iTec Compact, iTec Total and iTec Total EQ always ensures
that the temperature difference is retained. The control system detects if the balance is upset and increases or
decreases the speed of the circulation pump as necessary.
User Guide iTec Eco
AWIE01UG102 Thermia AB
8