Technibel PHRIE Series - Heat Pump Water Temperature Control

80
4.1 HEAT PUMP WATER TEMPERATURE CONTROL
Performed by A3 board
• The Inverter gestion is working or waiting in accordance with the ᇞT shown below.
ᇞT= T
A
– T
Y
T
A
: Water temperature from the installation – read by sensor TW1.
T
Y
: Resulting water temperature Setpoint Y
Note 1
: 10-minute mask time of the Inverter Gestion from WORKING to WAITING to avoid cycling.
Note 2
: 3-minute mask time of the Inverter Gestion from WAITING to WORKING to avoid cycling.
• By the control method the frequency of the compressor’s inverter is controlled in accordance with
the
ᇞT and the return water temperature from the installation.
Inverter frequency is controlled as follows
:
When
ᇞT is high (not yet reached the Controlled so that the inverter frequency is increased.
water temperature setpoint).
When
ᇞT is low Controlled so that the inverter frequency is decreased or kept.
(approximately +1.0 or less in the cooling mode or
approximately -1.0 or more in the heating mode).
When the return water temperature is Controlled so that the inverter frequency is increased.
rising in the cooling mode and
dropping in the heating mode.
When the return water temperature is Controlled so that the inverter frequency is decreased.
dropping in the cooling mode and
rising in the heating mode.
Note: The fluctuations of the compressor inverter frequency adjustments are calculated taking into account not only ᇞT, but
also-fluctuations in T
A
.