Section PLUMBING INSTALLER
Ed. 04/2012
49
which the ACF is installed and to the specific usage requirements in relation to the ACF
model installed (see paragraph 1.4 TECHNICAL SPECIFICATIONS, page 11).
Antifreeze must also be used to prevent the formation of ice in the ACF’s evaporator
during normal operation, which could cause damage if the volume of water in the
appliance or in the primary circuit is less than 70 litres for each ACF.
But if the ACF is expected to be operated in an area that has an outside air temperature
below +10°C (Data Processing Centres, technological use), monoethylene glycol must be
added to the water at a minimum concentration of 10% the volume of the water in the
appliance, even if the amount of water is equal to or greater than 70 litres.
The addition of monoethylene glycol modifies the thermal characteristics of the
water in the appliance and in particular, the density, viscosity and the average
specific heat. Always check the technical specifications of the antifreeze used as
well as the degradation data of the product, which can be obtained from the supplier.
Table 22 on page 49 reports the freezing temperatures of water and the resulting pressure
drop incrementation of the ACF60-00 and the circuit in relation to the percentage of
monoethylene glycol used in the appliance.
This table is useful in determining the size of the tubing and the circulation pump.
If automatic filling systems are used, the percentage of monoethylene glycol in the
appliance should be checked every season.
% MONOETHYLENE
GLYCOL
10
15
20
25
30
35
40
FREEZING TEMPERATURE
OF THE WATER
-3°C
-5°C
-8°C
-12°C
-15°C
-20°C
-25°C
PRESSURE DROP
INCREMENT
—
6%
8%
10%
12%
14%
16%
PRODUCTIVITY LOSS OF
THE ACF
(1)
—
0.5%
1%
2%
2.5%
3%
4%
Table 22 –
The influence of the percentage of monoethylene glycol on the functioning of the ACF
(1)
For version ACF60-00 LB see remark (2) on Table 8, page 17.
Summary of Contents for GA ACF60-00
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