CIAT MAJOR LINE 102A Manuel D'instructions page 39

Water quality recommended for water coils:
It is recommended to carry out a bacteriological analysis (detection of ferrobacteria,
bacteria producing H2S and reducing sulfates) and a chemical analysis (to avoid
problems with scaling and corrosion) of the water.
• Total hardness (French scale) 10 < TH < 15
• Chloride [CL-] < 10 mg/l
• Sulfate [SO₄ 2-] < 30 mg/l
EN
• Nitrate [NO₃ -] = 0 mg/l
• Dissolved iron < 0.5 mg/l
• Dissolved oxygen 4 < [O2] < 9 mg/l
• Carbon dioxide [CO2] < 30 mg/l
• Resistivity 2000 < Resistivity < 5000 Ωcm
• pH 6.9 < pH < 8
Operating limit recommendations:
Cooling coil inlet minimum water temperature: 5°C
Heating coil inlet maximum water temperature (2-pipe application without electrical
heater): 90°C
Heating coil inlet maximum water temperature (2-pipe application with electrical heaters
operating simultaneously): 55°C (min air flow: 200 m³/h)
Heating coil inlet maximum water temperature (4-pipe application): 90°C
Maximum operating pressure: 16 bar
Interior return air min./max. temperature: +0 C / +40°C
Indoor return air maximum humidity level: 27°C DB (dry bulb) at 65% RH (relative humidity).
Operating recommendation:
To prevent any inopportune opening of the thermo-actuators, the temperature of the
air surrounding the thermo-actuators should be kept at no higher than 50°C. This
risk must be taken into account, especially for units in a confined space (e.g.: units
installed in a suspended ceiling).
CIAT shall not be liable for damage to valves caused by faulty design of the
hydraulic supply network or incorrect commissioning.
To protect against the risk of condensation when using chilled water, lagging should
be placed along the entire lengths of pipes and completely sealed at its ends.
When using the water coil and electric heater, we advise against using cross-linked
polyethylene (PEX) pipes to supply water to the unit. This is because overheating
of the electric heater could cause the water temperature to rise briefly. This could
cause the rapid deterioration of the PEX pipe near the unit and cause it to burst.
We recommend using stainless steel braided (or equivalent) hoses for hydraulic
connections.
EN - 7