34 Aermec cod.
5167556_03 17.09
NRK 0200-0700
11.3.1. EXPANSION VESSEL CALIBRATION
Standard pre-load pressure value of the expansion
vessel is 1.5 bar, whereas volume is 24 litres.
Maximum pressure 6 bar.
Calibration of the vessel must be regulated using
the maximum level difference (H) of the user (see
diagram) by using the following formula:
For example: if level difference (H) is equal to 20 m,
the calibration value of the vessel will be 2.3 bar.
If calibration value obtained from formula is less
than 1.5 bar (that is for H < 12.25), keep calibration
as standard.
12. EXPANSION VESSEL CALIBRATION
KEY
(1)
Check that highest installation is not higher
than 55 metres.
(2) Ensure that lowest installation can withstand
global pressure in that position
H max
(1)
= 55 m
H = 12.25 m
H
H = 0 m
Ptar = H / 10.2 + 0.3
Ptar = 1.5 barPtar = 1.5 bar
H min
(2)
13. MINIMUM WATER CONTENT
NRK
0200 0280 0300 0330 0350 0500 0550 0600 0650 0700
Number of compressors
n°
2 2 2 2 2 3 4 4 4 4
Minimum water content admitted COLD SIDE
l/kW
7 7 7 7 7 7 7 7 7 7
Minimum water content admitted the HOT SIDE
l/kW
10 10 10 10 10 10 10 10 10 10
Minimum water content admitted the HOT SIDE
l/kW
14 14 14 14 14 14 14 14 14 14
ATTENTION
It is recommended to design
systems with high water content
(minimum recommended values
shown in table), to limit:
1. The hourly number of
inversions between
functioning modes.
2. Decrease in water temperature
during winter defrost cycles.
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