Airedale EcoChill 6kW - 46kW - Manual (Page 54)

54 EcoChill Installation Manual 7481930_v1.6.0_08_2013
ECL-ECLH 020-202
EN
The standard pressure setting that the expansion tank is
pre-charged to is 1.5 bar, the maximum value is 6 bar.
The expansion tank pressure setting has to be adjusted
based on the difference in height (H) of the installation
(see figure) according to the formula:
p (rating) [bar] = H [m] / 10.2 + 0.3.
For example, if the difference in height H is 20 m then the
value of the expansion tank pressure setting p is 2.3 bar.
If the calculated pressure setting value is less than 1.5 bar
(when H < 12.25), maintain the standard pressure setting
13. EXPANSION TANK PRESSURE SETTING
LEGEND
(1)
Ensure highest system point
does not exceed 55 m difference.
(2) Ensure that the lowest point of the
system can handle the total pres-
sure.
14. MINIMUM WATER CONTENT
ECL|ECLH 020 025 030 040 050 070 080 090 102 152 202
Number of compressors n° 1 1 1 1 1 1 1 1 2 2 2
Minimum recommended water content l/kW 4 4 4 4 4 4 4 4 4 4 4
WARNING
t is recommended to design for
a high system water content (the
table shows the minimum recom-
mended), to limit:
1. The frequency of changes in
operating modes.
2. The reduction of water tem-
perature during the defrost
cycle in winter periods.
Hmax1 = 55m
H = 12,25m
Hmin2
H
ECL 020-025-030
Hydraulic height
H m 30 25 20 15 ≥ 12.25
Expansion tank setting bar 3.2 2.8 2.3 1.8 1.5
Water content reference value l (1) 103 121 139 158 168
Water content reference value l (2) 46 55 63 71 76
ECL 040-050-080-090
Hydraulic height
H m 30 25 20 15 ≥ 12.25
Expansion tank setting bar 3.2 2.8 2.3 1.8 1.5
Water content reference value l (1) 257 303 348 394 419
Water content reference value l (2) 116 136 157 177 189
Glycol mix Water temperature °C Correction factor Reference condition
max. min.
10% 40 -2 0,507 (1)
10% 60 -2 0,686 (2)
20% 40 -6 0,434 (1)
20% 60 -6 0,604 (2)
35% 40 -6 0,393 (1)
35% 60 -6 0,555 (2)
Reference operating conditions:
(1) Cooling: Maximum water temperature = 40 °C, minimum water temperature = 4 °C.
(2) Heating (heat pump): Maximum water temperature = 60 °C, minimum water temperature = 4 °C