Special Maintenance - Hitecsa EWMIM Serie Manual De Instalación, Uso Y Mantenimiento

II.11.1.3 Cleaning fans
DANGER!
Pay attention to the fans. Do not remove the
protective grids for any reason whatsoever!
DANGER!
Always act on the general automatic switch
protecting the system before carrying out any
maintenance work, even if it is purely for
inspection purposes. Make sure that no one
accidentally supplies power to the machine; lock
the general automatic switch iin the zero position.
Check the fan grids monthly making sure they are not obstructed by any
objects and/or filth. The latter, besides drastically reducing the overall
performance of the unit, in some cases causes the fans to break.
II.11.1.4 Checking compressor oil level
IMPORTANT!
Do not use the unit is the oil level in the
compressor is low.
The 120 ÷ 154 models are equipped with an oil warning light on the
inverter compressor.
The 262 model is equipped with an oil warning light only on the fixed
compressor while on the inverter compressor there is the oil level
sensor which indicates its absence by generating an alarm on the
electronic board (see Electronic Controls manual). In case of sensor
intervention, contact an authorized HITECSA Service Center.
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.
120÷154
I
SP
F Fixed compressor
I Inverter compressor
SP Spy oil
SL Oil level sensor
IOM_EWMIM-EWMIMH_120a262_207984_200601_ES-EN-FR-DE-IT
262
F
I
SP
SL
II.11.1.5 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
speed 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.
IN
1
OUT
1 Evaporator
2 Acid solution tank
3 Cut-off gate valve
4 Auxiliary cock
5 Wash pump
6 Auxiliary filter
7 User
II.11.2

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 workshops 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 HITECSA spare parts.
81
ADVANCE
7
3 3
6
4
2
4
5