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___________________________________RAH / PAH Ka_________________________________
4 OPER ATION
Before its commissioning, the operational staff must be instructed, also by means of this Handbook, on the unit manufacture, management, operation,
and maintenance, on safety measures and regulations to respect, as well as on any personal protective equipment to arrange, properties and indications
to handle the used refrigerant.
4.1. DOCUMENTATION
The Owner of the unit must require all the authorizations and prepare the documents for the unit installation and operation required by the current applicable local
laws and regulations. In particular, he must collect and make available the documentation required to conrm that the installation has been carried out as per design
specications, and as required by current local laws and regulations.
Near the equipment, in a suitably protected position, all the information required to manage and maintain the system keeping it safe and reliable, must be kept in a
visible position, according to the current local regulations.
Besides if the machine (with a refrigerant charge higher than 3 kg) is installed inside the European Community, a Unit Register (henceforth called Register) should
be prepared and kept updated, as stated in EN 378-4, par. 4.3. This document must contain the following information on the unit:
a) the details of all maintenance and repair works;
b) The charged refrigerant quantity and type (new, used, or recycled) and the quantity of refrigerant each time discharged;
c) The used refrigerant analysis, (results, where available, must be noted in the Register);
d) The used refrigerant origin;
e) System components modications and replacements;
f) the results of all programmed tests;
g) the record of all relevant stop periods.
The register must be kept by the Owner so that an updated copy can always be consulted by the technicians during the unit maintenance and inspections.
4.2 PRELIMINARY CHECKS
Before the start-up, the unit must be visually inspected by a technician with a suitable experience. This inspection must include the following checks:
a) identication of any possible damage occurred during transport, stockage or handling;
b) Comparison of the installation with the hydraulic and wiring diagrams;
c) check of safety devices and their documentation;
d) check of certicates, Identication tag, and, in general, of required documentation;
e) check that accessible piping cannot accidentally harm people;
f) check that power supply is suitable to the required one;
g) check that the shut-off and check valves are in the right position and in good condition;
h) check that the dampers and fastening devices are adequate;
i) check the quality of welding, brazing and other junctions;
j) check that protection against mechanical damage, heat and moving devices are adequate;
k) check that the main components are easily accessible for inspection, maintenance and repair;
l) check the presence and good conditions of thermal and steam insulation;
The technician who carries out these checks must document them as required by current local regulations.
Before starting the unit, during start up or after a long stop, verify connections and wirings, as well as protective conductors connections. If any fault is detected,
the unit cannot be started.
Before starting the unit, verify that:
• the chiller is placed on a frame which can stably support it;
• the earth network is well done and connected to an efcient system;
• the power supply line is protected by an automatic switch with suitable size and features;
• on the unit connection entry, a mechanical lter with suitable size and features is installed;
;
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