Tips For A Successful Installation; Filling With Water; Water Circuit Anti-Freeze Protection - Ferroli OMNIA S 3.2 Installations- Und Bedienungsanleitung

7.6.3 Tips for a successful installation

For a correct design and installation of the hydraulic plant comply the local laws governing safety matters and sound.
The following information is suggestion for a correct installation of the unit.
• Before connecting the unit to the plant wash adequately the pipes using clean water, filling and emptying and cleaning the filters.
• Only after that proceed connecting the unit to the plant; this operation is crucial to ensure proper start-up without the need to have repeated stops to clean the
filter, with the possible risk of damage to heat exchangers and other components.
• Check by qualified personnel the quality of the water or of the mixture used; avoid the presence of inorganic salts, biological load (seaweeds, etc.) suspended
solids, dissolved oxygen and the pH. Water with inadequate characteristics can cause a pressure drop increase due to a rapid fouling of the filter, energy efficiency
decrease and corrosive symptom increase that can damage the unit.
• The pipes must have the least possible number of bends to minimize load losses and must be adequately supported in order to prevent the connections of the
unit from being excessively stressed.
• Install on-off valves near components that need to be serviced to isolate them when maintenance work needs to be done and to allow them to be replaced without
having to discharge the plant.
• Before isolating the pipes and charging the system, carry out preliminary inspections to make sure that there are no leaks.
• Isolate all the chilled water pipes to prevent condensation from forming along the pipes themselves. Make sure that the material used is the steam barrier type,
failing this, cover the insulation with an appropriate protection. Also make sure that the air venting valves can be accessed through the insulation.
• The circuit can be maintained under pressure using an expansion vessel (present in the unit) and a pressure reducer. A system filling device can be used that
automatically, under a pressure value, provides for the loading and maintenance of the desired pressure.
• Check that all plant components are able to withstand the maximum static pressure (depending on the height of the building to be served).
NOTE
If there is no glycol in the system (antifreeze) or if the unit is not able to remain electrically powered for possible blackouts, in order to avoid possible ic-
ing problems, empty the water during winter.
The unit is only to be used in a closed water plant. Application in an open water circuit can lead to excessive corrosion of the water pipes.
Water connections must be made in accordance with the outlook diagram delivered with the unit, with respect to the water intake and water outlet.
If air, moisture or dust gets in the water circuit, problems may occur. Therefore, always take into account the following when connecting the water circuit.
Use clean pipes only.
Hold the pipe end downwards when removing burrs
Cover the pipe end when inserting it through a wall so that no dust and dirt enter.
Use a good thread sealant for sealing the connections. The sealing must be able to withstand the pressures and temperatures of the plant.
When using non-brass metallic piping,make sure to insulate both materials from each other to prevent galvanic corrosion. Never use Zn-coated parts in
the water circuit. Excessive corrosion of these parts may occur as copper piping is used in the unit's internal water circuit.

7.6.4 Filling with water

1. Connect the water supply to the fill valve and open the valve.
2. Make sure the automatic air purge valve is open (at least 2 turns).
3. Fill with water until the manometer indicates a pressure of approximately 2.0 bar. Remove air in the circuit as much as possible using the air purge valves. Air present
in the water circuit might cause malfunctioning of the backup heater.
NOTE
During filling, it might not be possible to remove all air in the system. Remaining air will be removed through the automatic air purge valves during the
first operating hours of the system. Topping up the water afterwards might be required. The water pressure indicated on the manometer will vary depend-
ing on the water temperature (higher pressure at higher water temperature). However, at all times water pressure should remain above 0.3 bar to avoid air
entering the circuit.
The unit is only to be used in a closed water plant. Application in an open water circuit can lead to excessive corrosion of the water pipes.
Never use Zn-coated parts in the water circuit. Excessive corrosion of these parts may occur as copper piping is used in the unit's internal water circuit.
When using a 3-way valve or a 2-way valve in the water circuit. The recommended maximum changeover time of the valve should be less than 60 seconds.

7.6.5 Water circuit anti-freeze protection

All internal hydronic parts are insulated to reduce heat loss. Insulation must also be added to the field piping.
The software contains special functions using the heat pump and backup heater to protect the entire system against freezing. When the temperature of the water flow
in the system drops to a certain value, the unit will heat the water, either using the heat pump, the electric heating tap, or the backup heater. The freeze protection
function will turn off only when the temperature increases to a certain value.
In event of a power failure, the above features would not protect the unit from freezing.
96
EN
Cod. 3541V941 - Rev. 04 - 05/2022
OMNIA S 3.2