Multi-purpose "Energy Raiser" units
Multi-purpose "Energy-Raiser" units with automatic mode switch for
outdoor installation on four-pipe plants. The unit is supplied with
anti-freeze oil and refrigerant and has been factory tested. On-site
installation therefore just involves making connections to the mains
power and water supplies.
Unit charged with R407C ecological refrigerant.
STANDARD UNIT COMPOSITION
Frame with base in polyester-painted thick hot-galvanised sheet steel.
Shaped aluminium walls.
Panelling
The external panelling, made from aluminium alloy for total corrosion
resistance, offers maximum ease of access to the internal components.
Compressors
Hermetic scroll compressors complete with an oil sump heater,
electronic overheating protection with centralised manual reset and a
two-pole electric motor.
Water-refrigerant heat exchanger
AISI 316 steel braze-welded plate exchanger. The heat exchangers are
insulated with a closed-cell condensation proof lining in neoprene. A
thermostatically controlled electric heater prevents ice from forming
inside the evaporator when the unit is not working. When the unit is
working, it is protected by a differential pressure switch mounted on the
water side. The unit can work with antifreeze mixtures at exchanger
outlet temperatures as low as -8ˇăC.
Refrigerant-air heat exchanger
Finned coil exchanger made from copper tubes and aluminium fins.
The aluminium fins are correctly spaced to guarantee optimum heat
exchange efficiency.
Refrigerant-water heat exchanger
Heat exchanger used as heat recovery to produce hot water. AISI 316
steel braze welded plate exchanger. The heat exchangers are
insulated with a closed-cell condensation proof lining in neoprene
Fans
Axial electric fans, protected to IP 54, with external rotor and pressed
sheet metal blades. Housed in aerodynamic hoods complete with
safety grille. 6-pole electric motor with built-in thermal protection. The
fan chamber is divided into two sections. This improves efficiency with
partial loads as the fans of the idle circuit can be stopped.
Refrigerant circuit
Main components of the refrigerant circuit:
- liquid line shut-off valve,
- liquid line solenoid valve,
- dryer filter,
- refrigerant line sight glass with humidity indicator,
- externally equalised thermostatic valve,
- high pressure safety valve,
- low pressure safety valve (if required by regulations),
- high and low switch monitoring devices,
- liquid receiver.
- electrovalves for circuit configuration
Electric power and control panel
Electric power and control panel, built to EN 60204-1/EC 204-1 standards, complete with:
- control circuit transformer,
- general door lock isolator,
- fuses and contactors for compressors and fans,
- terminals for cumulative alarm block (BCA),
- remote ON/OFF terminals,
- spring-type control circuit terminal board,
- electric panel with double door and seals for outdoor installation,
- electronic controller,
- pump control consent relay
Basic model
The multi-purpose "Energy-Raiser" units were especially designed for
use with four-tube systems. Their hydraulic circuits are therefore
divided into two separate sections: one hot (condenser side) and one
cold (evaporator side). These units can produce hot and chilled water
at the same time and totally independently, adapting to the various
temperature requests inside the building.
There are three basic operating configurations which are totally
independent from external temperature conditions:
- production of just chilled water (the unit works as a simple chiller);
- production of just hot water (the unit works as an air-water heat
pump);
- combined production of hot and chilled water (the unit works as a
chiller featuring total recovery of condensation heat);
The above working configurations are selected automatically (on-board
microprocessor) with a view to optimising the energy used to satisfy the
various temperature requests by users.
PRODUCTION OF JUST CHILLED WATER
The unit works like a simple chiller and therefore discharges the excess
heat from inside the building (condensation heat) to the atmosphere
through an air-freon finned tube heat exchanger (condensation coil).
The water is cooled in a freon-water shell and tube heat exchanger
evaporator).
PRODUCTION OF JUST HOT WATER
In this case, the unit works exactly like a heat pump which channels the
heat of the external atmosphere through an air-freon finned coil
evaporator) in order to heat the water sent to the inside of the building
through a freon-water shell and tube heat exchanger (condenser). The
main difference compared with traditional reverse cycle heat pumps is
that the hot water is produced in a heat exchanger (from now on called
a heat recovery shell and tube exchanger) and not a shell and tube
evaporator. This is necessary in order to keep the hot and cold sections
separate as required by four-tube systems.
COMBINED PRODUCTION OF HOT AND CHILLED WATER
If users request the hot and chilled water at the same time, the unit
behaves just like a chiller with total condensation heat recovery. The
condensation heat is recovered in a freon-water shell and tube heat
exchanger (heat recovery exchanger) in order to heat the water for hot
water users. The refrigerant evaporates in another freon-water shell
and tube heat exchanger (evaporator) and cools the water in order to
satisfy requests for cold water.
The multi-purpose "Energy-Raiser" units were designed to distribute
total power output (hot and cold) over various independent cooling
circuits (up to a maximum of four for each unit). Thanks to the
sophisticated microprocessor control on the unit, this solution optimises
variations in internal requirements by adopting the operating
configuration it considers to be most suitable for each cooling circuit.
The use of suitable thermal accumulations, both on the cold and hot
sides, offers effective system operating modularity and optimises
running costs.
AVAILABLE VERSIONS
B (base)
Standard unit.
HL (High Temperature - Low Noise)
High efficiency low-noise version.
HT (High Temperature)
Version suitable for operation with high condenser input air
temperatures. This version features an oversized condensing section in
order to ensure that heat is correctly exchanged even in particularly
tough environmental conditions. As a result, when working at normal air
temperatures, an increase in cooling capacity and a decrease in power
input is obtained, thereby improving the cooling efficiency ratio
(E.E.R.).
LN (Low Noise)
Low noise version. This configuration features special soundproofing
for the compressor chamber and reduced fan speed. Fan speed is
automatically increased if environmental conditions are particularly
tough.
SL (Super Low Noise)
Super low noise version. This configuration features special
soundproofing for the compressor chamber, reduced fan speed, an
oversized condensing section, spring supports for the compressors,
vibration proof joints on the compressor intake and delivery lines, and a
muffler on the compressor delivery line. Fan speed is automatically
increased if environmental conditions are particularly tough.
Accessories
Spring isolators
Rubber isolators
DVV
Compressor suction and discharge valve
Cu/Cu condensing coils
Condensing coils with epoxy-coated fins
Condensing coils with Fin Guard Silver treatment
Condensing coil protection grilles
External evaporator water connections
Victaulic-couplings on evaporator
Flanges on evaporator
Evaporator water flow switch (supplied separately)
Automatic circuit breakers
Free voltage contacts for compr. operation signalling
Loc/O/Rem
Remote keyboard
Numbered wires
Phase sequence relay
Water pump kit with or without tank
Evaporator steel filter kit (supplied separately)
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