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II.13.4 Checking compressor oil level
IMPORTANT!
Do not use the unit is the oil level in the compressor is low.
The 270÷2100 models are equipped with an oil warning light only on the
fixed compressor, while the oil level sensor is present on the inverter
compressor, indicating its absence, generating an alarm on the electronic
board (see Electronic Control manual). In case of sensor intervention, con-
tact an authorized HITECSA Service Center.
The models 2115-2130 are equipped with oil warning lights both on the
fixed compressor and on the inverter compressor.
The lubricating oil level in the compressor can be checked by means of
the sight-glass. The oil level in the sight-glass can be inspected while the
compressor is running.
At times a small amount of oil could migrate towards the refrigeration
circuit causing slight level fluctuations; they can therefore be considered
normal.
Level fluctuations are also possible when capacity control is activated; in
any event, the oil level must always be visible through the sight-glass.
The presence of foam when the unit starts is normal. A prolonged and
excessive presence of foam during operation, on the other hand, means
that the refrigerant has not dissolved in the oil.
F
Fixed compressor
I
Inverter compressor
SP
Spy oil
SL
Oil level sensor
58
EQPI3X
II.13.5 Inspecting and washing the heat exchangers
DANGER!
The acids used for washing the heat exchangers are toxic. Use suitable
personal protective equipment.
IMPORTANT!
Use only chemical detergents suitable for cleaning the exchangers.
Unsuitable chemical detergents can corrode the exchanger damaging
it irreparably.
Exchangers, with the passage of time, are subject to fouling even under
nominal conditions of use. The working temperatures of the unit, the spe-
ed of the water in the pipes and the suitable finish of the heat exchanging
surface reduce fouling of the exchangers to a minimum. Any incrustation
of the exchanger may be detected by measuring the pressure-drop
between the inlet and outlet pipes, using a differential pressure gauge.
Any sludge that may form in the water circuit or any silt that cannot be
trapped by the filter, as well as extremely hard water conditions or high
concentrations of any antifreeze solution used, may clog the exchangers
and undermine their heat exchanging efficiency. In this case, it is necessary
to wash the heat exchanger with suitable chemical detergents. Provide
already existing systems with adequate charge and discharge connections.
The liquid detergent must circulate around the exchanger at a flow rate at
least 1.5 times higher than the rated working flow rate (without exceeding
the maximum admitted flow: see "Operating limits").
The first detergent cycle cleans up the worst of the dirt, after the first cycle,
carry out another cycle with clean detergent to complete the operation.
Before starting up the system again, rinse abundantly with water to get rid
of any traces of acid and bleed any air from the system, if necessary start
up the service pump.
1
Evaporator
2
Acid solution tank
3
Cut-off gate valve
4
Auxiliary cock
5
Wash pump
6
Auxiliary filter
7
User
II.13.6 Special maintenance
These are all those repairs or replacements which allow the unit to keep
on working in standard conditions. The replaced components must be
identical to the previous ones, ie equivalent as performances, dimensions,
etc., according to the specifications provided by the manufacturer.
IMPORTANT!
Maintenance is reserved exclusively for skilled personnel from wor-
kshops authorised by HITECSA , qualified to operate on this type of
products. Pay close attention to the danger signs on the unit. Use the
personal protective equipment foreseen by current laws. Pay the
utmost attention to the symbols located on the unit. Use EXCLUSIVELY
original HITECSAspare parts.
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