Filling With Water; Piping Insulation - Ferroli OMNIA H Series Installation, Maintenance And User Manual

WARNING
ETHYLENE GLYCOL IS TOXIC
CAUTION
Use of glycol
■ Glycol use for installations with a domestic hot water tank:
- Only propylene glycol having a toxicity rating or class of 1, as listed in "Clinical Toxicology of Commercial Products, 5th edition" may be used.
■ If there is too much pressure when using glycol, connect the safety valve to a drain pan to recover the glycol.
■ Uninhibited glycol will turn acidic under the infl uence of oxygen. This process is accelerated by presence of copper and at
higher temperatures. The acidic uninhibited glycol attacks metal surfaces and forms galvanic corrosion cells that cause severe
damage to the system.
It is of extreme importance:
■ That the water treatment is correctly executed by a qualifi ed water specialist.
■ That a glycol with corrosion inhibitors is selected to counteract acids formed by the oxidation of glycols.
■ That in case of an installation with a domestic hot water tank, only the use of propylene glycol is allowed. In other installations
the use of ethylene glycol is fi ne.
■ That no automotive glycol is used because their corrosion inhibitors have a limited lifetime and contain silicates that can foul
or plug the system;
■ That galvanized piping is not used in glycol systems since it may lead to the precipitation of certain elements in the glycol's
corrosion inhibitor;
■ To ensure that the glycol is compatible with the materials used in the system.
■ Be aware of the hygroscopic property of glycol. It absorbs moisture from the environment.
■ Leaving the cap off the glycol container causes the concentration of water to increase. The glycol concentration is then lower
and the water could freeze.
■ Preventive actions must be taken to ensure minimal exposure of the glycol to air.

Filling with water

1. Connect the water supply to the fi ll 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 possi-
ble using the air purge valves. Air present in the water circuit might cause malfunctioning of the backup heater.
☞
NOTE
During fi lling, 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 fi rst operating hours of the system. Topping up the water afterwards might be required.
■ The water pressure indicated on the manometer will vary depending 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.

Piping insulation

The complete hydraulic circuit that includes all the pipes must be insulated to avoid heat loss, condensation during operation,
reduction of heating or cooling capacity, as well as to prevent freezing of water pipes during winter.
INSTALLATION
19