Thermia iTec User Manual

5.2 Adjusting the indoor temperature
The indoor temperature is adjusted by changing the heat pump’s heat curve, which is the control system’s tool
for calculating the heating demand, the integral value. The integral value is determined by comparing the ac-
tual temperature of the heating system's supply line with the calculated value, the setpoint value. The heating
requirement is calculated from the current outdoor temperature and heat curve setting.
The heat curve will be adjusted in connection with installation. It must be adapted later on, however, to obtain
a pleasant indoor temperature in any weather conditions. A correctly set heat curve reduces maintenance and
gives energy efficient operation.
There are two ways of adjusting the heat curve, partly in the HEATING sub-menu, partly with the ROOM value.
Adjusting CURVE
A typical heat curve is shown below. When the outdoor temperature is 0°C the heat pump control tries to make
the temperature in the supply line 40°C. At hotter or colder outdoor temperatures than 0°C the set point that
the control regulates against is lowered or raised respectively. When you increase the CURVE value, the heat
curve will become steeper and when you decrease the CURVE value, the heat curve will become flatter. This is
the most energy and cost efficient way to set the indoor temperature and should therefore be used for long
term temperature settings.
4
2 0 0 - 2 0
2 4
4 0
5 6
2
3
1
5
1. Supply temperature (°C)
2. Maximum setpoint value
3. Outdoor temperature (°C)
4. 0°C
5. Set value (standard 40°C)
The following parameters can be adjusted in the HEATING menu:
Parameter
Description
CURVE If the CURVE value is increased, the heat curve will become steeper and if the value is de-
creased, it will become flatter. Raise or lower as necessary to obtain as even indoor tempera-
ture as possible.
MIN Lowest set point for supply temperature.
MAX Highest set point for supply temperature.
CURVE +5 Used to adjust the heat curve at an outdoor temperature of +5°C.
CURVE 0 Used to adjust the heat curve at an outdoor temperature of 0°C
CURVE -5 Used to adjust the heat curve at an outdoor temperature of -5°C.
HEAT STOP This function stops all production of heat when the outdoor temperature is equal to, or high-
er than, the set heat stop value.
User Guide iTec
Thermia Värmepumpar VUJSI102
17

Thermia iTec Specifications

General

Brand	Thermia
Model	iTec
Category	Heat Pump
Language	English