Domestic hot water
Option.
Domestic hot water management is of priority compared
to the system.
In DHW production mode, the compressors start only
if the DHW storage temperature is above a minimum
threshold (see chart).
The maximum variable flow temperature of the plant de
-
pends on the outdoor temperature.
To prevent it from falling below the minimum temperature,
it is advisable to install a backup electric heater on the
DHW storage.
The following components are required:
•
3-way valve SV1 (connection to XT1)
•
temperature probe Taf1
antifreeze protection for domestic hot water
•
temperature probe T5
regulation and switching between system and DHW
production
Operations sequence:
1. Disconnect the Taf1 sensor connected to the unit as
standard (main board-CN69)
2. Connect the Taf1 sensor supplied as a spare part with
the 10 m cable (main board-CN69)
3. After connecting the cable, attach the sensor to the
domestic hot water pipe
4. Connect the T5 sensor electrically and insert the T5
sensor into the domestic hot water tank
T outdoor
T5 DHW stor-
age tanks
Compres-
sor
backup
heater
24 °C < t.o ≤ 30 °C
< 15 °C
OFF
ON
24 °C < t.o ≤ 30 °C
≥ 15 °C
ON
OFF
t.o > 30 °C
< 20 °C
OFF
ON
t.o > 30 °C
≥ 20 °C
ON
OFF
Domestic hot water management
Taf1
CN69
21
4 221 546 / 00
ElECTRICal ConnECTIonS
