EN
23
Upon initial start-up, the specialized technician will have to ob-
tain the reference values of the system water using appropriate
test kits.
System water reference values
pH
6,5 ÷ 7,8
Electric conductivity
µS/cm
250 ÷ 800
Total hardness
°F
5 ÷ 20
Total iron
ppm
0,2
Manganese
ppm
< 0,05
Chlorides
ppm
< 250
Sulphur ions
assenti
Ammonia ions
assenti
If the total hardness is above 20°F or some of the make-up water
reference values are not within the indicated limits, contact our
pre-sales service to determine the treatments to be used.
Bore or groundwater not from water supply system should al-
ways be carefully analysed and if necessary treated with appro-
priate systems. If installing a softener, in addition to following
the manufacturer’s guidelines, adjust the hardness of the outlet
water to no lower than 5°F (also run pH and salinity tests) and
check the concentration of chlorides at outlet after regeneration
of resins.
Warning: do not introduce acids into the wash circuit.
If the indoor unit is installed outside or in a room where the tem-
perature may drop to under 0°C, empty the system or introduce
antifreeze liquid. The proportion of antifreeze must be suited to
the minimum temperatures which may be reached.
Solutions of water and ethylene glycol used as heat-transfer liq-
uids in place of water cause a reduction in the performance of
the unit. Add a maximum of 35% of ethylene glycol (protection
equivalent to as low as -20°C) to the water.
2 .9
Ethylene glycol solutions
Freezing temperature (° C)
0
–5
–10
–15
–20
–25
–30
–35
Percentage of ethylene glycol by weight
0
12%
20%
30%
35%
40%
45%
50%
correction factor cooling capaci-
ty (cPf)
1
0,985
0,980
0,974
0,970
0,965
0,964
0,960
corrective factor flow (cQ)
1
1,02
1,04
1,075
1,11
1,14
1,17
1,20
load loss correction factor (cdp)
1
1,07
1,11
1,18
1,22
1,24
1,27
1,30
For operation of units with different unspeakable mixtures (eg propylene glycol) contact our Sales department
Do not use mixtures in brine.
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