UM / UM PLUS
Chillers and inverter air / water heat pumps with axial fans
8
5
TECHNICAL CHARACTERISTICS
The UM / UM Plus water chillers and heat pumps series are designed for applications in residential and commercial areas, These
units are extremely versatile and can operate in heat pump mode with the ability of producing hot water at a temperature of 58°C
for environmental heating and sanitary applications. The INVERTER compressor with brushless DC motor technology, matched
with electronic expansion valve, pump and variable speed blower are generally used for optimizing the power consumption and
efficient operation of the refrigerating components.
5.1
FRAME
All UM / UM Plus units are made up of hot-galvanised thick sheet metal, painted with polyurethane powder enamels at 180°C to
ensure the best resistance against atmospheric agents. The frame is self-supporting with removable panels. All screws and rivets
for outdoor installations are in galvanized steel.
5.2
REFRIGERANT CIRCUIT
The refrigerant gas used in these units is R410A. The refrigerant circuit has been manufactured by means of international primary
brands components and according to the UNI EN 13134 Rule concerning welding procedures. The refrigerant circuit includes: 4
way reverse cycle valve, electronic expansion valve, liquid separator (models 09, 12 and 15), liquid receiver, valves for
maintenance and control, pressure safety device according to PED regulation, pressure transducers to accurately adjust the
evaporating and condensing pressures, filters for throttling valve to avoid its clogging.
5.3
COMPRESSORS
The used DC inverter compressors are a rotary hermetic type (for 06 model) and twin rotary (for 06,12 and 15 models) designed to
be used with R410 refrigerant. The compressors are all supplied with crankcase heater and thermal overload protection. They are
mounted on a rubber material acting as a shock absorber.
The compressors are mounted in a separate chamber in order to be separated from the air stream to reduce the noise. The
crankcase heater operates when the compressor remains off for at least 30 minutes and if the discharge temperature is below
20°C (with hysteresis of 2.0°C). When the compressor restarts, the crankcase heater will stop operation. We recommend to turn
on the unit and to put it in standby mode at least 6 hours before the first start-up.
The checking of the compressors is possible through the frontal panel of the unit that allow the maintenance of the compressors
even if the unit is working.
5.4
AIR SIDE EXCHANGERS
The air side exchangers are made up of copper pipes and aluminium fins. The diameter of the copper pipes is 7mm for the model
09 and 5/16” for the other models 12 and 15, the thickness of the aluminium fins is 0,1mm. The tubes are mechanically expanded
into the aluminium fins to improve the heat exchange factor. The geometry of these condensers guarantee a low air side pressure
drop and, then, the use of low rotation (and low noise emission) fans.
5.5
FANS
The fans are axial type with aluminium aerofoil blades. They are statically and dynamically balanced and supplied complete of the
safety fan guard according to the CEI EN 60335-2-80 Rule (safety for electrical apparatus of domestic and similar use). They are
mounted on the unit frame by interposition of rubber vibration dampers. The electric motors are all brushless DC type with 8
poles (about 200/1000 rpm). The motors are directly driven with an integrated thermal overload protection. The protection class
of the motors is IP X4.
5.6
USER SIDE HEAT EXCHANGERS
The user side heat exchangers are made up of AISI 304 stainless steel braze-welded plates type. The user heat exchangers are
factory insulated with flexible close cell material and can be equipped with antifreeze heater (KA optional). Each heat exchanger is
provided with a temperature sensor working as antifreeze protection that activates the circulator, even in the case when the unit
is turned off when the conditions set in the controller have been occurred.
5.7
ELECTRIC BOX
The electric box is manufactured according to the current European Union laws. The accessibility to the board is possible after
removing the front, side and top panels of the unit using proper tools. The protection degree is IP24. The terminal board is
supplied with voltage free contacts for remote ON-OFF, winter/summer change over, auxiliary heater, sanitary water temperature
sensor control of external 3-way valve and free contacts for remote control panel and for the management of the dual set point of
operation.
5.8
CONTROL SYSTEM
All UM / UM Plus units are standard supplied with a microprocessor adopting an overheating control logic program through the
electronic expansion valve which is driven by the pressure transducers signals. The microprocessor is also capable of controlling
the following functions: water temperature regulation, antifreeze protection, compressors’ time setting, compressor automatic
starting sequence, alarm reset, alarm management and operating LED. Upon request, the microprocessor can be connected to a
BMS remote control system and to the simpler HNS system with our terminal units. The control system together with the
INVERTER technology and the on board sensors continuously monitor and adapt the performance of the inverter compressor, of
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