Principle; Principle Of Heating And Hot Water Control; Power Failures; Three Different Operating Modes - IVT Greenline D14 Manual To Installation, Commissioning And Maintenance

Principle

Principle of heating and hot water control

Your heat pump is fitted with a Rego 600 control unit to guarantee you maximum savings and many
years of service. The unit, which has advanced monitoring functions, controls the heating and hot
water in your home. This ensures that all vital functions are monitored and that, if problems arise, the
heat pump is shut down before it is damaged.
When the heat pump is not able to meet the heating requirements, supplementary heat is connected
that together with the heat pump provides the required temperature. The Greenline E series has a
built-in electric heater that can be connected in three steps. The supplementary heat only provides
the output that the heat pump cannot generate and in this way can never take over heating the house
completely. When the heat pump is once more able to meet the heating demand, the supplementary
heat is automatically switched off. An oil-fired boiler is normally used to provide supplementary heat
for the Greenline D series. In which case Rego 600 controls the oil-fired boiler and the existing mixer
valve.
The heat pump is connected to the return line of the heating system so that it always receives the
coldest water. The water is heated in the heat pump and is then fed back to the heating system.
While the heat pump is heating the domestic hot water by using the electric water heater, the heating
system is disconnected temporarily through the three-way valve. A sensor in the hot water cylinder
makes sure that priority is always given to heating the hot water. When the water in the cylinder
reaches the required temperature, heat is once more supplied to the heating system.

Power failures

If the power supply fails, the control unit remembers all its settings and re-starts the heat pump when
the power returns.

Three different operating modes

The control unit can be used for three different operating modes: A, B and C. The three operating
modes are described schematically in the Installer chapter.
Operating mode A (D and E series)
This is the factory setting, based on an outdoor sensor and controls the heating temperature through
an adjustable control curve. Water heating takes priority over space heating. As well as operating
the heat pump, Rego 600 can also regulate other heat curves with a mixing valve, e.g. through a
combination of radiator and floor heating systems. An electric water heater is used for additional
heat.

Operating mode B (D series only)

Used when additional heat is from an oil-fired boiler. Operation is the same as for operating mode A.
Rego 600 cannot control other heat curves in this operating mode.

Operating mode C (D series only)

Used in exceptional cases, it does not provide optimal operation for the heat pump because it always
works with a high temperature, or "Fixed Temperature". This is often used in operation with one or
more accumulator tanks. The tank is always kept at a high temperature and the hot water is often
heated in one or more coils.
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