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- Opening the 3-position modulating valves:
There are two options:
1) If the power has not yet been switched on, the valve will be open by default.
2) If the control has already been powered up, remove the servomotor to release
the rod and open the valve.
● Filling
Drain the coils during commissioning.
● Water quality recommended for water coils
It is recommended to carry out a bacteriological analysis (detection of ferrobacteria,
bacteria producing H2S and reducing sulphates) 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
- Sulphate [SO4 2-] < 30 mg/l
- 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: 6°C
- Heating coil inlet maximum water temperature (2-tube application without
electrical heaters): 70°C
- Heating coil inlet maximum water temperature (2-tube application without
electrical heaters): 55°C (min. air flow rate = 200 m
- Heating coil inlet maximum water temperature (4-tube application): 80°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).
- Recommended supply air temperature: < 65°C
● Operating recommendations:
To prevent any inopportune opening of the thermo-actuators on control valves with
thermal motors, the temperature of the air surrounding the thermo-actuators should
not exceed 50°C. This is especially important for units installed in confined spaces
(e.g. in suspended ceilings).
AB
A
B
EN - 7
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EN
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