3
MU ECHOS A
TECHNICAL FEATURES
MU ECHOS
Water/water chiller and heat pump with scroll compressors
and plate heat exchangers.
STRUCTURE
The units are designed to be installed from inside. The struc-
ture is in steel sheet coated with epoxy-polyester powder
paint, with removable panels insulated with sound absorbing
material. The sizes 6, 8 and 11 are painted with RAL 7035
colour, suited for installation on the wall, the sizes from 16 to
48 are painted in RAL 7035 colour for installation on the floor.
COMPRESSOR
Rotary screw hermetically sealed scroll type compressors with
internal thermal protection, heater for the crankcase, suppor-
ted by rubber antivibration mounts to reduce the vibrations
transmission to the unit.Cooling circuitComprende: feed inlets,
dehydrating filter, thermostatic expansion valve, high and low
pressure switches. Units of sizes from 16 to 48 are also provi-
ded with safety valve and fluid sight glass.
EVAPORATOR
Brazed plate heat exchanger in stainless steel AISI 316 insulated
against condensate, temperature probe on the vane-operated
flow switch antifreeze protection (installed on sizes 6, 8 and 11
and supplied with the unit for the other sizes).
CONDENSER
Brazed plate condenser in stainless steel AISI 316 sized to
operate with well water (in/out 15/30 °C). The chiller units can
be fitted upon request with condenser sized to operate with
tower water (in/out 30/35°C).
ELECTRICAL PANEL
The panel consists of: main disconnect switch, automatic dis-
connect switch for the main and auxilliary power circuit pro-
tection, compressor remote disconnect switch, on/off digital
signal input contact, microprocessor for parameter setting
control of the following functions:
•
Regulation of water temperature;
•
Control of set-point self-regulation;
•
Anti-freeze protection
•
Compressor timing
•
Alarm signalig
•
Alarm reset
•
Cumulative alarm contact for remote signaling;The control
display shows the following information:
•
Ingoing and outgoing water temperature;
•
Currently set temperature and differential
•
Alarm description
•
Operation hour counter;
CONTROL AND SAFETY DEVICES
The units are equipped with:
•
Manual reset high pressure switch
•
Controlled manual reset low pressure switch;
•
High pressure safety valve (except for the 6, 8 and 11 sizes,
basic and /HP version);
•
Water temperature probe on the user side, installed on the
heat exchanger inlet;
•
Antifreeze probe on the user side heat exchanger outlet;
•
Vane-operated mechanical flow switch fitted on sizes 6, 8
and 11 and supplied with the unit for the other sizes;
•
Compressor overtemperature internal protection.
TESTING
All units are factory-tested and supplied complete with oil and
refrigerant (except for the LE, LE/HP, LC and LC/HP units).
VERSIONS
Check the table with the available configurations for any inter-
ferences between one option and the other.
The basic version constists of a cooled-water water chiller.
/HP:
reversible heat pump
Besides the components of the MU ECHOS, the cooling circuit
is equipped with 4-way inversion valve and a second thermo-
static expansion valve. The hydraulic circuit consists of a pres-
sure switch valve, a bypass solenoid valve and a second vane-
operated water flow switch. These components are already
installed on the 6, 8 and 11 sizes and for the other sizes they
are supplied with in the kit). The electrical panel has a digital
input contact for summer/winter switching.
/LE:
motocondensing unit
Motocondensing unit: The unit is designed to operate with an
air-cooled evaporator therefore it does not have a heat exchan-
ger on the user side or a thermostatic valve (can be supplied in
the kit upon requeast). The unit is loaded with nitrogen instead
of refrigerant
/LE /HP
reversible motocondensing unit
The unit is designed to operate with a remote air-cooled eva-
porator/condenser therefore it does not have a heat exchanger
on the user side or a thermostatic valve suited for chiller opera-
tion mode(can be supplied in the kit upon requeast). The unit
has a fluid receiver sized for the split unit supplied by Blue Box
and the thermostatic valve for the heat pump operation mode.
The unit is loaded with nitrogen instead of refrigerant
/LC
motoevaporating unit
The unit has no heat exchanger on the source side in order to
allow connection to a remote air-cooled condenser. The unit is
loaded with nitrogen instead of refrigerant
/LC /HP
reversible motoevaporating unit
The unit has no thermostatic valve for heat pump operation