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Heez +050002745 rel. 1.2 - 16.11.2021
ENG
1. WARNINGS
1.1 General
warnings
•
The Heez controller must be incorporated by professionally qualified personnel into a complete unit or system as
part of a fixed installation and, in any case, inside a metal enclosure.
•
This device contains dangerous voltages. Failure to observe the instructions contained in this technical leaflet and
in the user manual may cause serious damage to people and things.
•
The Heez system controller and components comply with the requirements of standard IEC 60079-15, ed.4, as
required by EN 60335-2-34:2011, EN 60335-2-40/A1: 2007 and EN 60335-2-89: 2011 for the use of hydrocarbons as
refrigerants (R290 – propane);
•
The components of the Heez system are to be used in systems with R290 refrigerant, however applying appropriate
solutions to prevent the risk of explosion at any time (safe zone);
•
The components of the Heez system are not ATEX certified and cannot for any reason be used in areas with
explosive or flammable atmospheres; the owner, designer and installer are responsible for ensuring strict
compliance with the standards in force in order to avoid all risks;
•
Design of the Heez system, installation, commissioning and maintenance of the Heez controller are all operations
reserved for qualified personnel, who have understood all of the safety, installation, operation and maintenance
warnings contained in this technical leaflet and in the user 0300052EN, downloadable, even prior to
purchase, from www.carel.com, under “Documentation”.
1.2
Fundamental safety rules
Before carrying out any maintenance work:
disconnect Heez and the external control circuits from the power supply by moving the main system
switch to “off”; wait at least 5 minutes;
always check, using a suitable multimeter, that there is no dangerous voltage across the terminals;
always make sure that the compressor has stopped completely. Freely rotating motors may generate
dangerous voltages across the terminals on Heez, even when this is not powered.
Check that the heat sink is not too hot: contact with the heat sink may cause serious burns.
When Heez is connected to the power supply, the compressor terminals U, V and W are live, even if the
motor is not running.
Never measure insulation resistance or dielectric strength with alternating current, as this may cause faults
on some of the internal components; the Heez controller is supplied factory-tested for the applied voltage;
during final testing when assembled on the unit, it can therefore be disconnected, or alternatively the test
can be performed using direct current, as specified by the standards.
There may be dangerous control voltage at the relay outputs even when Heez is not connected to the
mains power supply.
The level of safety provided by the enabling inputs (excluding the “Safety Torque Off” input when used in
compliance with the standards) on Heez is not sufficient in critical applications without adopting additional
independent measures to ensure safety. For all applications in which malfunctioning may cause serious
damage to people and things, the risks must be assessed and additional protection measures adopted.
Ensure a correct earth connection and only use cables specified by local regulations in force.
The Heez controller typically has leakage current less than 1 mA.
Ensure compliance with all national and local laws and regulations regarding the safety of low voltage
equipment installations, as well as the requirements for correct use of tools and personal protective
equipment.
Only use this device for the purposes specified by the manufacturer. Do not modify or replace the
components unless recommended by the manufacturer, as this may cause fire, electric shock or other
damage.
