MAINTENANCE AND OPERATING MANUAL
Description
HAS T 070÷140
36
ENGLISH
EN
The data in this manual are not binding and they can be modified by the manufacturer without notice. Reproduction of this manual is strictly prohibited.
3.2.3 Fans
The fans are of the axial type, comprising a diecast aluminium fan wheel with sickle
shaped blades.
The 6-pole electric motor is wired for high speed in N versions and for low speed in
SN and SSN versions.
The fan protection rating is IP54. All fans feature insulation class F to ensure they
are compatible with outdoor operation in all climates. Fan assembly is completed by
an aerodynamically profiled port made of galvanized sheet steel and safety grilles
downstream and upstream of the air flow.
The option of electronic control envisages high efficiency silent running fans, with integrated inverter motor and EC
technology (permanent magnet with electronic switching).
In the event of maintenance work on the fans, since capacitors are used it is necessary to wait at least three minutes
after the power supply to the unit is shut off before opening the box containing the electrical contacts.
3.2.4 Evaporator
The evaporators are of the stainless steel brazed plate type with dual refrigerant circuit and
single water circuit and external insulating and anti-condensation cladding. The water
connections are of the threaded type for all models. The evaporator is protected from the risk of
freezing caused by low evaporation temperatures by means of the antifreeze function of the
electronic controller, responsible for the control of water outlet temperature. In addition, each
evaporator is equipped with a flow switch to protect it from damage caused by insufficient
water flow rate.
All evaporator versions can handle antifreeze solutions and, in general, all other liquids that are
compatible with the hydraulic circuit construction materials. The evaporators are equipped with
an air bleed valve on the top.
The flow rate of fluid passing through the evaporator must not exceed the values given in the table in heading "4.3.3
Hydraulic connections".
If the hydraulic kit is not supplied, user water connections to the evaporator are the responsibility of the customer.
3.2.5 Heat recovery and desuperheater
This function can be active exclusively during operation of the unit in Chiller mode.
Heat recovery exchangers and desuperheaters are refrigerant-water exchangers.
The presence of recovery exchangers or desuperheaters makes it possible to use rejection heat
generated during the condensing stage for the production of hot water (e.g. for a domestic hot water
system).
Installed upline from the condenser, the desuperheater is constantly subject to a through-flow of
superheated gas.
The recovery exchanger is installed in parallel with the condensing coils. Control by means of a 3-way valve makes it
possible to divert the hot gas from the condenser to the recovery exchanger and vice versa on the basis of recovery heat
demand or in relation to the unit's heating duty.
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