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Priority management and domestic hot water DHW request (3-way switch-over valve)
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 posi-
tioned 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
2.9.1. EEM ACCESSORY - ENERGY METER
The EEM accessory allows certain unit features, such as those below, to be measured and displayed:
o Power supply voltage and total instantaneous current absorbed by the unit
o Total instantaneous electric power absorbed by the unit
o Instantaneous power factor (cosφ) of the unit
o Electricity consumption (kWh)
If the unit is connected via a serial network to a BMS or external supervisory system, the trends of the measured parameters can be stored and the operat-
ing status of the unit itself checked.
2.9.2. FDL ACCESSORY - FORCED DOWNLOAD COMPRESSORS
The FDL accessory (forced reduction of the power consumed by the unit) allows power to be restricted according to the utility requirements by setting, on a
dedicated page, the desired maximum power %.
The function, which can be enabled and configured from the unit display, can activated via a digital signal (potential-free contact), daily time bands or, if
there is a serial network, via Modbus.
In the presence of the EEM accessory, which allows for the instantaneous measurement of the absorbed power, it is possible to set a precise maximum
absorbed power value.
2.9.3. SFS ACCESSORY - SOFT STARTER
The SFS accessory is used to reduce the start-up current peak, thereby achieving a soft and gradual start, with a noticeable benefit in terms of mechanical
wear of the electric motor.
Below is a qualitative drawing to represent a unit with 2 compressors equipped with and without SFS accessory. The inrush current values with the SFS
accessory are indicated in tables "A" Technical data.
Inrush current - without SFS
Sp
Inrush
C [A]
Current
T [s]
Time
Inrush current - with SFS
Sp
Inrush
C [A]
Current
T [s]
Time
H5xxxxx
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type of probe
NTC HT150
NTC
features
50kΩ@25°C
3977 (±1%)
10kΩ@25°C
3435 (±1%)
EasyPACK ECO - Nias
β (25/85)
Tmax
120°C
90°C
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