EN
26
2 .12 P2 secondary circulation pump operation
The P2 pump is operated only by the TA “hot water only” setting
(and therefore also with the regulator in standby).
The device uses a wet rotor high efficiency circulation pump
suited for all heating and cooling systems with a temperature
range from -10 °C to +110 °C which by means of specific syn-
chronous motors - with permanent magnet rotor controlled by
inverter in class A - guarantee up to 80% of energy saving with
respect to standard pumps.
Furthermore, the control electronics automatically adapt opera-
tion to the changing conditions in the hydraulic system.
A regulator is present on the front of the pump body to select
the maximum head according to the actual needs of the system
and to select:
II
I
III
Min.
– constant (factory set) head mode (rpm) in which the pressure
generated by the pump is maintained constant at the set val-
ue in the entire permitted flow rate range (this mode is indi-
cated for systems with constant losses of load or three-way
bypass valve)
Constant head
III
H
I
II
Q
– variable head Δp-v operating mode in which the electronic
system varies the head developed by the pump between the
set value and half the set value as the water flow rate varies.
This mode is particularly suited for systems with variable loss
of load with two-way valves.
Variable head
H max
H
H min
Hs
Q
Hs
1
/
2
The maximum head value setting of the P2 heating/cooling sys-
tem pump must be made with the compressor at 100% all dis-
tribution valves open and the devices on checking the thermal
gradient between system delivery and return lines, which must
be comprised between 4 - 7 °C.
Set a lower circulator speed if the thermal gradient is lower than
4 °C. On the contrary, if the thermal gradient is higher than 7 °C
check the opening of all valves on the system and then add an
external pump to increase the water flow rate.
P2 secondary pump flow rate/head chart
0
10
20
30
40
50
60
70
80
0,6
0,8
1
1,2
1,4
1,6
1,8
2
2,2
2,4
2,6
2,8
3
Hst (kPa)
Q (m³/h)
The maximum water loss permitted in the system must be
compatible with the residual head of the pump in the device.
Содержание PDC FLOOR 12T
Страница 2: ......
Страница 58: ...IT 58 4 7 Esempi Schemi Idraulici ...
Страница 59: ...IT 59 ...
Страница 60: ......
Страница 61: ......
Страница 62: ......
Страница 63: ......
Страница 64: ...FAF0FB001BZ 05 11 2019 bit ly rdzwebsite ...