AERMEC HBI 080, Installation Manual, Page: 40 / 45

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HBI. 1011. 4138500_00
28. FUNCTIONING AND DAILY MAINTENANCE
To prevent damage to the unit, all unit
protection devices have been set before
delivery, in a way that the user must never
have to regulate or remove them.
When starting up the unit for the fi rst or
second time after prolonged standstill
(more than 1 day) with the interruption
of the current supply, electrify the unit in
advance to pre-heat it for more than 8
hours.
Never rest any objects on the unit and on
the accessories. Keep the space around
the unit dry, clean and ventilated. Imme-
diately remove all dust accumulated on
the condenser fi ns in order to ensure maxi-
mum performance of the unit and do not
stop it as a protective measure.
To prevent damage to the unit caused by
the hydraulic system block, clean the sys-
tem fi lter and frequently control the water
fi lling device.
To guarantee anti-freeze protection, do
not interrupt the electric current if the
room temp. drops below zero in winter.
To prevent cracks in the unit owing to
freezing, empty the water from the unit
and the piping system, which are not
used for a long period of time. Moreover,
open the water tank closing cap for emp-
tying.
Ensure a frequent control of the function-
ing conditions of each part to see if there
are oil stains on the piping joints and load
the valve to prevent refrigerant leaks.
If machine malfunctioning lies outside
the user's control, contact the authorised
after-sales centre immediately.
! WARNING: The water manometer is in-
stalled in the indoor unit return water line.
Regulate the hydraulic system pressure on
the basis of the successive item:
If the pressure is lower than 0.5 bar, re-
load the water immediately;
When re-loading, the pressure of the hy-
draulic system must not exceed 2.5 bar.
BREAKDOWNS CAUSES SOLUTION
The compressor does not
start-up
A - Problems with the electric power supply
B - The connection cable has loosened
C - Malfunctioning of the main panel
D - Compressor malfunctioning • The phases sequence is inverted
• Check and re-phase
• Find the cause and repair.
• Replace the compressor
The fan makes a lot of noise
A - The fan fixing bolt has loosened
B - The fan blade touches the casing or the grid
C - Fan functioning is unreliable • Fasten the fan fixing bolt
• Find the cause and regulate.
• Replace the fan
The compressor makes a lot
of noise
A - Clogging of the liquid occurs when the liquid
refrigerant enters the compressor
B - The parts inside the compressor are broken • Check whether the expansion valve is faulty and
the temperature probe is loose. In this case, repair.
• Replace the compressor
The water pump does not
function or functions anoma-
lously
A - Malfunz. dell’alimentazione elett. o del termi-
nale
B - Relay malfunctioning.
C - Presence of air in the water pipe
• Find the cause and repair
• Replace the relay
• Evacuate the air
The compressor starts and
stops frequently
A - Little or excess refrigerant
B - Poor circulation in the hydraulic system
C - Low load
• Drain or add refrigerant
• Hydraulic system blocked or containing air.
Check the water pump, the valve and the piping.
Clean the water filter or bleed the air.
• Regulate the load or add storage tanks.
The unit does not heat even
if the compressor is running
A - Refrigerant leak
B - Compressor malfunctioning • Repair the leaks and add refrigerant
• Replace the compressor
Poor hot water eating effi-
ciency
A - Poor heat isolation of the hydraulic system
B - Poor evaporator heat exchange
C - Little refrigerant in the unit
D - Heat exchanger block on water side
• Improve heat insulation efficiency
• Control whether the air inside or outside the unit
is normal and clean the unit evaporator
• Control whether the unit refrigerant escapes
• Clean and replace the heat exchanger.
TROUBLESHOOTING