Hitecsa EWMIG 236 Manuel D'installation, D'utilisation Et D'entretien page 42

II.6.7.1.2 Activation and deactivation of DS and RC100
The units set up with DS desuperheater or total recovery RC100 can activate the thermal recovery by means of an external digital input (e.g. the KTRD
accessory).
Moreover, the criterion to stop the thermal recovery can be established from the panel:
•
for digital contact: if the consensus is interrupted, the thermal recovery stops as well. This mode meets the requirement to carry out a temperature
control system of the storage tank connected to the recovery;
•
for maximum return temperature: the said limit is set from the panel on the machine or from the remote keyboard (KTR accessory). The recovery
keeps operating until the return temperature is lower than the configured set point. This mode is suitable for maximising the use of the thermal recovery.
DS/RC100 water connections place
Set-up of a 3-way heat pump (KVDEV) and domestic hot water production (DHW) and possibly a desuperheater (DS) at the same time
2
4
With this type of system, the main circuit of the heat pump produces DHW (winter season) or DCW (summer season) for the user. The unit can be set-
up as a pump or pump and storage tank as alternative to the traditional solution seen installed in the system. For the production of DHW by using the
heat pump, use a technical water storage tank, which cannot be used directly for human consumption, and combine it to a DHW producer/intermediate
heat exchanger.
Should a 3-way valve system (KVDEV) be envisaged, it can manage production of hot water to the DHW circuit in both the summer and winter seasons.
In fact, the valve enables water flow deviation from the system to the technical water storage tank for the system to produce DHW for domestic use.
The desuperheater, with which the machine can be fitted, must be connected to the same technical water storage tank for the DHW production system,
and is able to keep the heat storage tank level high. This way, the system allows maximum service continuity to the DHW and system, regardless of the
operation mode (summer or winter).
Priority management and domestic hot water DHW request (3-way switch-over valve KVDEV and activation of any DS)
How to manage the DHW request:
•
by means of the discrete input: the request is assigned by a thermostat (e.g. via a KTRD accessory). When the thermostat closes, the unit
understands that there is a DHW request and, once the conditions have been verified, the procedure is activated to meet the DHW requirements;
•
by means of a temperature probe in the storage tank: a temperature probe is placed inside the storage tank, which is directly connected to the
unit's board. The required set point can be configured from the panel together with the relative activation differential. In this case, the probe must be
accurately positioned and the maximum distance allowed respected due to the type of probes used.
Type of probe:
Description
NTC150
NTC
3 1
6
5
Type of probe
NTC HT150
NTC
1 Heat pump
2 System user side storage tank
3 Pump
4 3-way diverter valve outside the unit (KVDEV)
5 User-DHW
6 System recovery side storage tank
features
50kK@25°C
10kK@25°C
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