CIAT MAJOR LINE Manual De Instrucciones página 35

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 simultaneous electrical
heaters): 55°C (min. air flow rate = 200 m³/h)
Heating coil inlet maximum water temperature (4-tube application): 90°C
Maximum operating pressure: 16 bar
Indoor 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 electrical heater, we advise against using cross-linked
polyethylene (PEX) pipes to supply water to the unit. This is because overheating
of the electrical 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 - 23
MAJOR LINE