Operating instructions

E-15
English
Domestic Hot Water Preparation 10.1
8 Domestic Hot Water Preparation
Hot water cylinders with a sufficient heat exchanger area should
be used for DHW preparation. These must be capable of
permanently transferring the maximum heat output of the heat
pump.
Regulation is carried out using a sensor installed in the hot water
cylinder. The sensor is connected to the heat pump controller.
The temperatures attainable in heat-pump-only operation are
below the maximum flow temperature of the heat pump.
Regulation can also be carried out using a thermostat.
8.1 Basic heating using the heat pump
A request for domestic hot water is recognised if the current
hot water temperature < (is lower than)
Set temperature – (minus) Hot water hysteresis.
A request for domestic hot water ends if
Hot water temperature > (is higher than) set temperature
If the set temperature is not reached within one hours, the hot
water request is blocked and heating operation is enabled again.
Heating operation is then interrupted again after one hour by a
hot water request.
Tab. 8.1: Settings for basic heating of domestic hot water (user settings carried out in compliance with the operator’s manual)
8.1.1 Attainable hot water temperatures
The maximum hot water temperature that can be attained with
heat-pump-only operation is dependent on:
 The heat output of the heat pump
 The heat exchanger surface area installed in the cylinder
and
 The volume flow in relation to the pressure drop and the
capacity of the circulating pump.
8.2 Thermal disinfection
A start time must be specified for the thermal disinfection. By
starting the thermal disinfection, the system will immediately
attempt to reach the set temperature by means of the flange
heater. Thermal disinfection is ended once the set temperature is
reached. To enable the thermal disinfection settings menu, the
flange heater must be set to “Yes” in the preconfiguration.
NOTE
If the set temperature is not reached within 4 hours, the thermal
disinfection is terminated. The set start time can be activated or
deactivated separately for each day of the week.
9 Program Description
9.1 Utility block / heat pump operation block
Temporary disconnection of the heat pump may be required by
utility companies (Energie-Versorgungs-Unternehmen (EVU)) as
a condition for a favourable electricity tariff. During a utility block,
the voltage on terminal N16-J4/ID3 is interrupted.
In the case of systems without a utility block, the enclosed bridge
must be inserted at the relevant terminal connections.
NOTE
If an additional dew-point monitor (N5) is installed, the heat pump request
is reset in cooling mode when the dew-point monitor is activated.
10 Heat Pump Controller for Cooling
10.1 Cooling program description
10.1.1 Cooling operating mode
The cooling functions are manually activated as operating mode
6. There is no automatic switching between heating and cooling
operation.
Switching-off the cooling.
The following limits are provided as safeguards:
 The flow temperature falls below a value of 7 °C
 The dew point is reached with silent cooling only
Menu Submenu Set value
Preconfiguration Domestic hot water preparation Yes