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[m
] (kg)
max
1.3.2 Preventing leakages
● Do not let air enter the refrigeration cycle, because this will increase the risk of
explosion and injury due to high pressure inside the refrigerant cycle.
● Keep all tubing runs as short as possible.
● Use the flare method for connecting tubing and apply refrigerant lubricant to the
matching surfaces of the flare and union tubes before connecting them, then tighten
the nut with a torque wrench for a leak-free connection.
● Do not leak refrigerant while working on the refrigerant tubes during installation,
maintenance or repair.
● Check carefully for leaks (see → 1.3.3 Detecting leaks, p. 17) before starting the
test run.
1.3.3 Detecting leaks
● If a leak is suspected, remove or extinguish all naked flames and ventilate the space
immediately.
● To search for and detect any refrigerant leaks, never use potential sources of ignition
like e.g. a halide torch or any other detector using a naked flame.
● Leak detection fluids are suitable for use with most refrigerants, but the use of
detergents containing chlorine shall be avoided, as the chlorine may react with the
refrigerant and corrode the copper pipework.
● Preferably, use an electronic leak dectector, which is suitable for R32, to check for
leaks.
● Make sure that the electronic detector has an adequate sensitivity and that it has been
calibrated in a refrigerant-free area.
● Set the leak detector to a percentage of the lower flammable limit (LFL) of the
relevant refrigerant, and calibrate the detector to the refrigerant used (R32) so that the
appropriate percentage of refrigerant gas (max. 25 %) is confirmed.
1.3.4 Repairing leaks
If a leakage of refrigerant is found, which requires brazing, do the following:
● Recover all refrigerant from the system, or isolate all refrigerant by means of shut-off
valves in a part of the system remote from the leak.
● Purge the system with oxygen-free nitrogen (OFN) both, before and during the brazing
process.
● Re-fill the system with refrigerant and check for any remaining leaks
(see → 1.3.3 Detecting leaks, p. 17).
● Repeat this procedure until no more leaks are detected.
1.4
Warranty policy
We can be held responsible for the quality and performance of the AHU Kit we supply.
However, we cannot be held responsible for the performances, operations and machine controls
of your complete AHU system which incorporates our AHU Kit, nor for the components used in
the refrigerant cycle of your AHU system (including, but not limited to, compressors, high-pressure
AHU Kit – Installation Instructions – 07/2023
Elite
U-71PZH4E5
U-100PZH4E5
U-71PZH4E8
U-100PZH4E8
2.850
5.975
General information and safety notes
U-125PZH4E5
U-140PZH4E5
U-125PZH4E8
U-140PZH4E8
1
17
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