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3.1.7 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, 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), thermal overloads (protection of pumps and fans), overload switches, control circuit
automatic breakers, compressor contactors, automatic switches and pump contactors. The terminal board has volt free contacts for remote
ON-OFF, Summer/ winter change over (heat pumps only) and general alarm.
3.1.8 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 (For multiple compressors), alarm reset.
The control panel is supplied with display showing all operational icons. The microprocessor is set for automatic defrost (when operating in
severe ambient conditions) and for summer/ winter change over.
The control also manages the anti-legionella program, the integration with other heating sources (electric heaters, boilers, solar panels
etc), the operation of a three port modulating valve (for diverting to DHW or heating) and both the heating circuit pump and the domestic
hot water circuit pump. 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 Lochinvar technical department can discuss and evaluate, in conjunction with
the customer, solutions using MODBUS protocols.
3.1.9 Control and protection devices
All units are supplied with the following controls and protections: user water return temperature sensor, antifreeze protection temperature
sensor installed on users water output, domestic hot water supply and return temperature sensors (only versions P2S), high pressure
manual reset, low pressure automatic reset, compressor thermal protection, air fan, thermal protection, pressure transducer (used to opti-
mize the defrost cycle and to adjust the fan speed depending on ambient conditions), flow switch. All units are also fitted with a temperature
probe sensor with "Energy Saving" function, supplied in a separate plastic box, which can be used to stop the pump use during periods of
stand-by, when the water temperature reaches the set point. Doing this the power consumption of the unit is strongly reduced. The probe
sensor must be positioned in the hydraulic compensator present at the screening technique. The domestic hot water circuit (only versions
P2S) is already equipped with this probe, but it must be installed in the user circuit.
3.1.10 User flow switch
The flow utility is installed as standard on all units and disables the operation of the unit in case of abnormal water flow in the system. The
flow switch is made of a blade system fitted in the flow of the water; it is combined with two permanent magnets that assess the amount of
water in transit and, in function of the measured parameter, enable or not the operation of the unit.
3.2 Versions
3.2.1 Version HH
HH heating only versions are available in the P2U and P2S configuration only.
3.2.6 HE Version
High efficiency version, according to ERP2018 standard. Unit equipped with EC fans.
3.2.8 Version XL
All versions are supplied, as standard, with the latest 'Floating Frame' technology that completely isolates the compressors from the main
casing, thereby eliminating vibration and noise from this source. The 'Floating Frame' is a special vibration and acoustic damping system
that consists of a base plate and acoustic enclosure that houses the compressors. The base plate is separated from the supporting frame
of the unit by soft steel springs that have a high damping power. Within the enclosure, the compressors are mounted on rubber shock ab-
sorbers on the floating base plate. The enclosure is manufactured from galvanized steel sandwich panels that have a core of 30 mm thick,
high density (25 kg/m
) mineral wool. The entire arrangement provides a double damping system and acoustic attenuation. The compressor
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refrigerant pipes are connected to the refrigerant circuit through "anaconda" flexible connections. Flexible connections are also used on the
water pipework within the unit. The combination of these systems results in an overall noise reduction in the region of 10-12 dB(A).
3.2.10 Version P2U
This is a two pipe version that can produce hot water for heating and cold water for cooling. The unit is used with two pipe water based
change-over systems. It is not able to produce domestic hot water.
3.2.11 Version P2S
This is a two pipe version that can, in addition to producing hot water for heating and cold water for cooling, also generate domestic hot
Rev. A 11-2020
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