Domestic Hot Water Preparation; Basic Heating Using The Heat Pump; Attainable Hot Water Temperatures; Program Description - Dimplex WPR 2006 Installation And Start-Up Instructions Manual

Domestic Hot Water Preparation

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.

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 – hysteresis DHW.
A request for domestic hot water is ended if
hot water temperature > set temperature
Menu
Preconfiguration
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 which can be attained with
heat-pump-only operation is dependent on:
The heat output of the heat pump

9 Program Description

9.1 Limit Temperature (Bivalence Point)

The external temperature at which the heat pump is just able to
cover the heat consumption is called the limit temperature or
bivalence point. This point marks the transition from heat-pump-
only operation to bivalent operation combined with an immersion
heater or boiler.
The theoretical bivalence point may deviate from the optimal
bivalence point. Particularly during transition periods (cold
nights, warm days), it is possible to lower the energy
consumption by means of a lower bivalence point in accordance
with the wishes and usage of the user. For this purpose, a limit
temperature can be set on the heat pump controller in the menu

9.2 Utility Block / Heat Pump Operation Block

Temporary disconnection of the heat pump may be required by
utility companies as a condition for a favourable electricity tariff.
The voltage on terminal ID3 is interrupted during a utility block.
In the case of systems without a utility block, the enclosed bridge
must be inserted at the relevant terminal connections.
For higher hot water temperatures, the heat pump controller
offers optional control of a flange heater.
Regulation can also be carried out using a thermostat. With this
application, selective reheating using a flange heater is not
possible.
NOTE
The additional setting options for heat pumps with an additional heat
exchanger installed in the hot gas are described in Chapter Chap. 10 on
p. 15.
NOTE
DHW heating can be interrupted by defrosting or by the high-pressure
safety program.
Submenu
Domestic hot water preparation
The heat exchanger surface area in the cylinder and
The volume flow in relation to the pressure drop and the
capacity of the circulating pump.
"Settings – 2nd heat generator – Limit value" to enable the
2ndheat generator.
The limit temperature is normally only used in mono energy
systems with air-to-water heat pumps or bivalent systems in
combination with boilers.
A limit temperature of -5 °C should be aimed for in the case of
mono energy operation. The limit temperature is calculated from
the heat consumption of the building in relation to the external
temperature and the heat output curve of the heat pump.
If "Operating mode Bivalent-alternative" was set in the
preconfiguration, the heat pump is blocked if the external
temperature is lower than the set limit temperature.
NOTE
The external disable contact (contact ID2) should be used for an external
block of the HP cooling operation to avoid the formation of condensate.
9.2
Setting
Yes
E-13