Publicidad
Idiomas disponibles
Idiomas disponibles
II.10.2
Special maintenance
These are all those repairs or replacements which allow the unit to keep on working in standard conditions. The spare parts must be identical to the
previous ones.
Control
Electrical system
Check the power consumption of the unit
Check electrical control board contactors
Fans
Electric motor of fans
Checking gas charge and humidity in
circuit (with unit running at full capacity)
Check that there are no gas leaks
Verify operation of maximum pressure
switches
Bleeding air from the chilled water
system
Draining the water system
(if necessary)
Checking conditions of anti-vibration
mountings on compressors
Checking earth connection
Replacement of compressor bearings
II.10.2.1 Top-up / replacement of refrigerant charge
The units are factory-tested with the gas charge necessary for correct
operation. The amount of gas inside the circuit is shown directly on the
serial no. plate. When restoring the charge or topping it up, take into
account the environmental and operational conditions of the unit.
Should the R134a need to be topped-up, drain and evacuate the circuit,
eliminating traces of non-condensable gases with any humidity.
Then top-up the exact amount of new oil and refrigerant as shown on
the serial no. plate. The refrigerant must be poured from the load
cylinder at the liquid state. After any maintenance operations on the
refrigerant circuit and before restoring the gas charge, wash the system
thoroughly, as follows:
install an anti-acid filter in intake to the compressor and have the unit
run for at least 24 hours;
check the acidity degree and change the refrigerant and oil if needed
and let the unit run for at least 24 hours;
remove the anti-acid filter cartridge.
Once the topping-up operation is complete, repeat the unit start-up
procedure and monitor its operating conditions for at least 24 hours.
If, for any particular reason, such as a refrigerant leak, you wish to
simply top-up the refrigerant, bear in mind that there may be a slight
drop in unit performance. In all cases the top-up must be carried out in
the low pressure section of the machine before the evaporator, using
the pressure sockets. Make sure that the refrigerant is introduced only
in the liquid phase. Watch the liquid indicator while adding the fluid, to
make sure it is perfectly clear without bubbles.
II.10.2.2 Restoring compressor oil level
With the unit switched off, the oil level in the compressors must partially
cover the sight-glass on the level matching tube. The level is not always
constant as it depends on the ambient temperature and the percentage
of refrigerant in the oil.
With the unit on and in nominal conditions the oil level should be clearly
IMPORTANT!
Do not use lubricants different from those
recommended.
The lubricant is highly hygroscopic and therefore
it must not come into contact with air.
Frequency
Besides checking the various electrical devices, the electrical insulation of all
Every 6 months
the cables and their correct tightening on the terminal boards must be verified,
paying special attention to the earth connections.
Every 6 months
This operation must be carried out by skilled personnel of authorised HITECSA
Every 6 months
workshops, qualified to operate on this type of products.
Make sure the motors and fan blades are clean and that there are no
Every 6 months
abnormal vibrations.
The motor must be kept clean with no traces of dust, filth, oil or other
impurities. These could cause it to overheat due to low heat dissipation The
Every 6 months
bearings are usually watertight with permanent lubrication and sized in order
to last approximately 20.000 hours in standard operational and environmental
conditions.
Every 6 months
Every 6 months
This operation must be carried out by skilled personnel of authorised HITECSA
Every 6 months
workshops, qualified to operate on this type of products.
Every 6 months
If the unit is idle during winter months, it must be emptied.
In alternative, a glycol mixture can be used according to the information
provided in this manual.
Every 12 months
Make sure there are no cracks, and/or batch alterations
Every 6 months
10.000h inspection
This operation must be carried out by skilled personnel of authorised HITECSA
50.000h
workshops, qualified to operate on this type of products.
replacement
78
Notes
visible through the sight-glass and must be flat without any ripples.
An additional oil top-up can be carried out after evacuating the
compressors, using the pressure connection on the intake.
The exact amount of lubricating oil is carried in the serial no. plate of the
compressor. Use only oils in compliance with the specifications
provided by the manufacturer and carried in the serial no. plate of the
compressor to top-up or change oil. The lubricant is POE-type
(polyoester).
The following types of oil are compatible with R134a gas:
Supplier
Type
BSE 170 5Lt cod:91511504
BITZER
BSE 170 10lt cod. 91511505
CPI
Solest 170 (BS 170)
CASTROL
SW 220 HT EU
FUCHS
Triton SE 170
II.10.3
Repairing and replacing components
Always refer to the wiring diagrams enclosed with the appliance
when replacing electrically powered components. Always take care to
clearly label each wire before disconnecting, in order to avoid making
mistakes later when re-connecting.
When the machine is started up again, always go through the
recommended start-up procedure.
After maintenance has been performed on the unit, the liquid-
humidity indicator (LUE) must be under control. After at least 12 hours
of running, the refrigeration circuit of the unit must be perfectly "dry",
with the LUE green, Otherwise, the filter needs to be replaced.
EQS
Kinematic viscosity
40°C (cSt)
170
175,2
220
170
Publicidad
Capítulos
