IOM SyScroll 140 360 Air EVO 361549
36
7.1 General Information
Units are one-block type with single refrigerant circuit. They are
intended to cool down the water required for any air-conditioning
application as well as any other fluid, such as for example glycol water.
These units are completely assembled at works. They are equipped
with all the refrigerating connections and the internal electrical wiring
required for a rapid installation on the field. An operation test is
performed after assembly, with water flowing through the refrigerant/
water exchanger in order to make sure that the refrigerating circuit is
properly working. The refrigerating circuit of every unit is pressure
tested before inspection, drained and charged with R410A. A low
noise level is the result of a careful study. It is achieved on chillers
by using technologically advanced components without negatively
affecting the operation performances and limits of the units.
7.2 Body and Frame
The base and frame of these units are made with galvanized steel
elements, assembled with stainless steel screws. All panels can
be removed to ensure easy access to internal components. All
galvanized steel parts are protected by epoxy powder paint.
7.3 Compressors
The models are equipped with two SCROLL hermetic tandem
compressors with an internal motor protection. The compressors of
all models are assembled on rubber shock absorbers. Their motors
can be directly started. They are cooled down by the aspirated
refrigerant gas and equipped with internal thermistor protections
against overloads. Overload protections are automatically reset
after having tripped. The compressor terminal box has an IP21/54
protection degree. Compressors are powered on and off by the
microprocessor of the unit control system which is intended to
control the delivery of the thermal refrigerating capacity.
7.4 Evaporators
Evaporators are made of stainless steel plates. They are thermally
insulated by means of a thick flexible insulating mattress with closed
cells. The maximum operating pressures correspond to 10 bar for the
water side and to 45 bar for the refrigerant side. Antifreeze protection
for the water in the exchangers is ensured by electrical heaters and
differential pressure switches.
7.5 Condensing/evaporating coils
Coils are of reversible type and are made of copper tubes arranged
in staggered rows and mechanically expanded inside an aluminium
finned pack. The maximum operating pressure on the refrigerant side
of the condensing coils is 45 bar. The condensing coils mounted on
cooling only units are of microchannel type.
7.6 Condenser Fans
The condenser fans are of a helical type. They are directly coupled
and have an impeller with wing contoured aluminium blades.
Each fan is equipped with a galvanised steel accident-prevention
protection which is painted after manufacture. The fans motors
are completely closed. They have an IP54 protection degree and a
protection thermostat embedded in the windings.
7.7 Fans Control
All models have a step speed controller as a standard. It will act
according to the condensing pressure and allow the operation down
to an Air temperature operation of +10°C.
7.8 Refrigerating Circuit
Each unit has a single refrigerating circuit equipped with external
service valves intended to measure the refrigerant pressure and
charge, sight glass with a humidity indicator, dryer filter and thermal
expansion valve. Refrigerating circuit is also complete with high
pressure switch as well as high and low transducer.
7.9 Control Supply Panel
All components of the control system and those necessary to start
the motors are shop connected and tested. The control compartment
contains an electronic card and a control board with an external
keyboard and display, to show the operational functions, as well as
the intervention of the alarms and the working blocks.
7 - Product Description