AS NZS 5149.4:2016 pdf free

AS NZS 5149.4:2016 pdf free.Refrigerating systems and heat pumps – Safety and environmental requirements
Before a new refrigerating system is put into service, the person responsible for placing the system in operation shall ensure that the operating personnel are instructed on the basis of the instruction manual about the construction, supervision, operation and maintenance of the refrigerating system,as well as the safety measures to be observed, and the properties and handling of the refrigerant used.
NOTE It is advisable that the operating personnel are present during evacuation, charging with refrigerant and adjustment of the refrigerating system as well as, if possible, during assembly on site.
If the discharge line of a pressure relief device is connected into a common discharge line and the valve is temporarily dismounted for reasons of testing and maintenance, the connecting ends of the remaining ends entering the common discharge header are to be blocked.
When a secondary cooling or heating system is used, the heat-transfer medium shall be periodically inspected in accordance with manufacturer instructions for its composition, and the secondary system shall be tested and inspected for the presence of refrigerant from the primary circuit.
Repairs on refrigerant containing components shall be carried out in the following order, if appropriate:
a) instructing of the maintenance staff;
b) emptying, recovery and evacuation;
c) disconnecting and safeguarding of the components to be repaired (e.g. powerdrive, pressure vessel,piping);
d) cleaning and purging (e.g. with nitrogen);
e) releasing for repair;
f) carrying out the repair;
g) testing and checking of the repaired component (pressure test, leakage test, functional test), see ISO 5149-2;
h) replacing, evacuating and recharging with refrigerant.
The Coulometric Karl Fischer Titration shall be used for determining the water content of refrigerants.This method can be used for refrigerants that are either a liquid or a gas at room temperature. For all refrigerants, the sample for water analysis shall be taken from the liquid phase of the container to be tested. AS NZS 5149.4 pdf free download.