Table of Contents
Advertisement
3.
TECHNICAL CHARACTERISTICS
U
NIT DESCRIPTION
Amicus boost heat pumps are particularly suitable for applications that use source energy at medium or high temperatures.
These units have been designed to produce water at high or very high temperature for applications where it is necessary to have
maximum efficiency in heating. The units are available in heating only mode and can produce water up to 80°C. If an external
3-way valve is used, the appliance can supply both heating and domestic hot water. A wide range of accessories allows you to
choose the optimal solution.
Frame
All units are made from hot-galvanised sheet steel, painted with polyurethane powder enamel and stoved at 180°C to provide
maximum protection against corrosion. The frame is self-supporting with removable panels. All screws and rivets used are made
from stainless steel. The standard colour of the units is RAL 9018.
Refrigerant circuit
The refrigerant utilised is R134a. The refrigerant circuit is assembled using internationally recognised brand name
components with all brazing and welding being performed in accordance with ISO 97/23. Each refrigerant circuit is totally
independent from the other with the result that any fault or alarm condition on one circuit does not influence the
other. The refrigerant circuit includes: sight glass, filter drier, thermal expansion valve with external equalizer, Schrader
valves for maintenance and control and pressure safety device (for compliance with PED regulations).
Compressors
The compressors used are a high performance scroll type that incorporates a special scroll design which enhances the
efficiency of the refrigerant cycle when the source temperature is low. The compressors are all supplied with a crankcase
heater and thermal overload protection by a klixon embedded in the motor winding. They are mounted in a separate
enclosure thus enabling them to be maintained even if the unit is operating. Access to this enclosure is via the front panel
of the unit. The crankcase heater is always powered when the compressor is in stand-by.
Source heat exchanger
Source heat exchanger are braze-welded plates and are made of stainless steel AISI 316.
The use of this type of exchangers greatly reduces the refrigerant charge of the unit compared to the conventional shell
and tube evaporators, and increases the efficiency of the refrigerant loads. The heat exchangers are factory insulated
with flexible close cell material and are protected by a temperature sensor used as antifreeze protection kit.
User exchangers
The user side heat exchanger is a braze welded, plate type heat exchanger, manufactured from AISI 316 stainless steel.
All units are supplied with a sub-cooler to enhance the performance of the refrigerant cycle. The user heat exchangers are
factory insulated with flexible close cell material.
Electric enclosure
The enclosure is manufactured in order to comply with the requirements of the electromagnetic compatibility standards CEE
EN60204. Access to the enclosure is achieved by removing the front panel of the unit. The following components are
supplied as standard on all units: main switch, thermal overloads (protection of pumps and fans), compressor fuses, control
circuit automatic breakers, compressor contactors, fan contactors and pump contactors. The terminal board has volt free
contacts for remote ON-OFF, Summer/Winter change over (reversible type only) and general alarm. For all three phase units, a
sequence relay that disables the power supply in the event that the phase sequence is incorrect (scroll compressors can be
damaged if they rotate in the wrong direction), is fitted as standard.
Microprocessors
All units are supplied as standard with microprocessor controls. The microprocessor controls the following functions:
control of the water temperature, antifreeze protection, compressor timing, compressor automatic starting sequence, alarm
reset, volt free contact for remote general alarm, alarms and operation LED's. If required (available as an option), the
microprocessor can be configured in order for it to connect to a site BMS system thus enabling remote control and
management. The technical department can discuss and evaluate, in conjunction with the customer, solutions using
MODBUS protocols.
Control and protection devices
All units are supplied with the following control and protection devices: Return and supply user heat exchanger sensors, return
and supply source heat exchanger sensors, high pressure switch with manual reset, low pressure switch with automatic reset,
high pressure safety valve, compressor thermal overload protection, pump thermal overload protection (when
present), source heat exchanger flow switch.
Page | 12
Advertisement
Table of Contents
