Hitecsa ADVANCE EWMIM 120 Mode D'emploi page 70

II.9.1.2 Set-up of a 3-way heat pump 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 with pumps as an alternative to the traditional solution that sees them 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 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 (domestic
hot water diverter valve CACS consent + domestic hot water valve VACS control).
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.
II.9.1.3 Priority management and domestic hot water DHW request (3-way switch-over valve VDEV 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 temperature probe in the storage tank: a temperature probe is placed inside the storage tank, which is directly connected to the unit
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.
The software manages two types of probe selectable from the keyboard
description
NTC150
NTC (*)
(*) Default
IOM_EWMIM-EWMIMH_120a262_207984_200601_ES-EN-FR-DE-IT
3
1
6
3
type of probe features
NTC HT150 50kK@25°C
NTC 10kK@25°C
1 Heat pump
2 System user side storage tank
3 Pump
4 3-way valve - Not supplied
5 User-DHW
6 System recovery side storage tank
þ (25l85)
3977 (±1%)
3435 (±1%)
72
ADVANCE
Tmax
120°C
90°C