IVT Rego 5101 Installation Manual page 20

Settings
4.5.1 Hot water temperatures
A start temperature and a stop temperature is set for
E4x.T3. If the sensor is local T9 is automatically set to
the same stop temperature in the heat pump.
Highest permitted stop temperature for hot water
decreases when T11 (heat transfer fluid out) in the heat
pump falls below - 2 °C. If necessary the control unit also
adjusts the start temperature so that it is below the stop
temperature by at least 2 K.
4.5.2 Hot water demand
Hot water demand arises when T3 falls below its start
temperature and ceases when T3 exceeds its stop
temperature. With a local sensor, T9 must also exceed
the stop limit.
4.5.3 Emergency operation, hot water
If the function is activated and local sensor T3 is not
working, hot water production is switched over to
emergency mode. 120 minutes after the previous hot
water production, the 3-way valve switches over to hot
water and a start signal is given to G2. This happens
whether the compressor is running or not. If T9 is below
the T3 start temperature, hot water demand is activated,
otherwise the 3-way valve changes back to its previous
position. The hot water demand ceases when T9
exceeds its and T3's joint stop temperature.
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6 720 645 172 (2010/07) en