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Cod. 3541T090 - Rev. 00 - 06/2019

INSTALLATION

Antifreeze system, antifreeze fluids, additives and inhibitors

When necessary, antifreeze fluids, additives and inhibitors can be used only if the manufacturer of such fluids or additives guarantees that they are suitable and do not

cause damage to the exchanger or other components and/or materials of the boiler/heat pump and system. Do not use generic antifreeze fluids, additives or inhibitors

that are not specific for use in heating systems and compatible with the materials of the boiler/heat pump and system.

System water characteristics

The heat pumps are suitable for installation in heating systems with non-significant entry of oxygen (ref. systems “case

I” EN14868). A physical separator (e.g. plate heat exchanger) must be provided in systems with continuous entry of oxygen

(e.g. underfloor systems without antidiffusion pipes or open vessel), or intermittent (less than 20% of system water content).

The water within a heating system must have the characteristics required by UNI 8065, and comply with laws and regulations

in force and the provisions of EN14868 (protection of metallic materials against corrosion).

The filling water (first filling and subsequent replenishment) must be clear, with hardness below 15°F and treated with suitable

chemical conditioners against the initiation of corrosion, that are not aggressive on metals and plastics, do not develop gases

and, in low-temperature systems, do not cause proliferation of bacterial or microbial masses.

The water in the system must be periodically checked (at least twice a year during the season when the systems are used,

as required by UNI8065) and have: possibly a clear appearance, hardness below 15°F for new systems or 20°F for existing

systems, pH above 7 and below 8.5, iron content (Fe) below 0.5 mg/l, copper content (Cu) below 0.1 mg/l, chloride content

below 50mg/l, electrical conductivity below 200 µs/cm, and must contain chemical conditioners in a concentration sufficient

to protect the system for at least one year. Bacterial or microbial loads must not be present in low temperature systems.

Only use conditioners, additives, inhibitors and antifreeze liquids declared by the producer suitable for use in heating systems

and that do not cause damage to the heat exchanger or other components and/or materials of the boiler and system.

Chemical conditioners must ensure complete deoxygenation of the water, contain specific protection for yellow metals (cop-

per and its alloys), anti-fouling agents for scale, neutral pH stabilizers and, in low-temperature systems, specific biocides for

use in heating systems.

Recommended chemical conditioners:

SENTINEL X100 and SENTINEL X200

FERNOX F1 and FERNOX F3

The unit is equipped with a frost protection system that activates the heat pump in heating mode when the system delivery

water temperature falls below 4°C. The device is not active if the power and/or gas supply to the unit is turned off. If neces-

sary, for system protection use a suitable antifreeze liquid that meets the same requirements as set out above and provided

for by Standard UNI 8065.

In the presence of adequate chemical/physical system and feed water treatments and related high cyclicity controls able to

ensure the required parameters, for industrial process applications the product can be installed in open-vessel systems with

vessel hydrostatic height able to ensure compliance with the minimum operating pressure indicated in the product technical

specifications.

The presence of deposits on the indoor unit exchange surfaces due to non-compliance with the above requirements

will involve non-recognition of the warranty.

Water filter

A water filter must be installed at the entrance of the unit.

The unit is supplied as standard with two square taps. The tap with a blue handle is equipped with a filter (which can be disassembled by unscrewing the rear fitting)

and therefore acts as an interception tap and a water filter; this tap must be mounted on the system return connection (see part.10 “fig. 6 - dimensional data and

connections” on page 11). The tap with red handle must be mounted on the system delivery connection (see part 11 “fig. 6 - dimensional data and connections” on

page 11).