Hitecsa EWMIG 236 Manual De Instalación, Uso Y Mantenimiento página 48

II.10.2 SPECIAL MAINTENANCE
II.10.2.1 Component replacement instructions
If a unit requires repair, switch it off and recover the refrigerant fluid
from both the high and low-pressure sides and in the liquid line. This is
because, if the coolant is only drained from the high pressure side, the
compressor springs may close together, thereby preventing the
pressure from equalising. In this way, the low pressure part of the
casing and the inlet line could remain pressurised. In this case, if you
apply a brazing torch to one of the low-pressure components of the
system, the pressurised mixture of refrigerant and oil could blow out of
the circuit and ignite on contact with the brazing torch. To prevent this
risk it is important to make sure that the pressure on the high and low
pressure sides have actually been drained before desoldering.
II.10.2.2 Restoring the refrigerant load
Rapidly filling with refrigerant on the inlet side of a single-phase system
may prevent the compressor from starting or cause a breakage. The
best way to avoid this situation is to fill both high and low pressure sides
simultaneously. Topping up units with R410A refrigerant must be carried
out in the liquid phase, piping it from a cylinder so as not to alter its
composition.
II.11 INSTRUCTIONS TO DISMANTLE THE UNIT AND
DISPOSE OF HAZARDOUS SUBSTANCES
SAFEGUARD THE ENVIRONMENT!
HITECSA has always cared about protecting the
environment. When the unit is dismantled it is
important to adhere scrupulously to the following
procedures.
The unit must only be dismantled by a firm authorised for the disposal
of scrap machinery/products.
The unit as a whole is composed of materials considered as secondary
raw materials and the following conditions must be complied with:
the compressor oil must be removed, recovered and delivered to a
facility authorized to collect waste oil;
if the appliance contains antifreeze, this should not just be disposed of
freely, as it causes pollution. It should be collected for possible
recycling;
refrigerant fluid should not be discharged into the atmosphere. It should
instead be recovered by means of homologated devices, stored in
suitable cylinders and delivered to a company authorised for the
collection;
the filter-drier and electronic components (electrolytic condensers) are
considered special waste, and must be delivered to a body authorized
to collect such items;
the foamed polyurethane rubber and foamed polyethylene mesh pipe
insulation, the shrink-wrap, the polystyrene packaging and the sound-
absorbent sponge lining on the panelling must be removed and
processed as urban waste.
SECTION II: INSTALLATION AND MAINTENANCE
50