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The Heat Pump Control
The HP of the LWRc-8kW type comprises a digital controller with a LED panel,
which is located inside the building. It is not possible to commission the device
without the controller and – as an anti-theft measure – a replacement controller is
supplied only against a damaged one.
The controller is used for setting the functions and the parameters of the heat pump.
The controller also displays error messages - see the table below. The device is
factory-set and the user should carefully consider changing the parameters. The device
can be controlled by using one of two options.
A) The standard (and recommended) control method is in accordance with the
temperature of the water entering the LWRc. Set on the controller in this case are the
required upper limit (Parameter 1) and the critical lower limit for switching on the
electrical source (Parameter 6). Hysteresis for re-switching the device after reaching
the upper limit is adjustable between 2 and 15 °C. By default the hysteresis for
switching off the electric boiler is set at 2 °C.
B) The second option is to control the device via a room thermostat, for which a
certain hysteresis is anticipated (see the wiring diagram). The thermostat, however, is
not the object of the supply. The device is protected from cycling by a 4-minute
interval. For this type of control, however, it is practicable to increase the required
value of the return water (Parameter 1).
The device displays the output temperature (Parameter C), which, in accordance with
the flow rate, may be cca. 3–10 °C higher than the input temperature (or, in the
cooling mode, lower). We recommend operating the device with a flow rate of
2,000 l/h, at which level it has the highest level of efficiency that corresponds to a
delta of cca. 3 °C. The device is equipped with a flow sensor and any flow
insufficiency may manifest as an error message. The device is fitted with frost
protection, which automatically starts-up the circulation pump when the exterior
temperature drops to below +3 °C.
The device is provided with the option of reducing the fan speed at night (Parameter
13).
C) Control of the device in the cooling mode enables its operation in floors or in fan
coils, the air-conditioning of the heat exchanger, for technological cooling, etc., in
accordance with Parameter 0. Every 20 minutes, in floor mode, it monitors the outlet
water temperature, and if this drops to below 15 °C, the device shuts down and
displays PP10 error message. This measure is necessary for protecting the floor from
the condensation of moisture e.g. when the water filter becomes clogged.
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