35
18
CHARACTERISTIC CURVE OF THE CONTROL VALVE FOR UNIT IN PARALLEL
If the hydronic configuration (CI) is installed on the unit with the variant "external pump in parallel" (2), the head losses of the
ON/OFF motorized valve should be added to those reported in the curves of Paragraph 17.
For example: for the model
HPE
25 with nominal water flow 1,01L/s, we obtaine 1,4kPa (valve head loss) + 30kPa (hydronic
circuit head loss)=34,9 kPa (total internal head loss).
19
ACCESSORIES TO REDUCE THE NOISE LEVEL
19.1
SL
The silenced unit (with SL accessory) is provided with innovating thermo-acoustic shells on compressors. These shells allow a noise
reduction up to 10% at specific compressor rotation frequencies. The special multi-layer structure generates a thermal insulation
which reduces, at very low outside temperatures, the heat losses of 2% compared to a standard insulation.
Water flow [L/s]
He
ad
lo
ss [
kP
a]
