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Before testing ensure with supplier that the equipment has been designed to operate at these conditions,

as pipe-work gauges may be incorrect. The Serial Plate will specify the maximum low side design pressure,

if low side is stated lower than high then a low side pressure relief valve must be fitted.

If high side and low side pressure relief valves are fitted:

High side: 80% of high PRV valve rating.

Low side: 80% of low PRV valve rating

If you intend to test to higher pressures or strength test the system please remove the pressure relief valves

before commencing to retain there integrity. The maximum operating pressures of the high and low side of the

system will be stated on the serial plate, note however that safety switches should be set 10% below these values

to prevent pressure relief valves discharging.

Procedure:

Testing by visual examination, and a proprietary bubble solution. Ensure your supply cylinder of Oxygen Free

Nitrogen (OFN) is fitted with a pressure limiting device set at just above your maximum test pressure value. Never

move a cylinder with a regulator fitted.

At this stage the refrigeration compressors must remain electrically isolated from the system.

Open all liquid and suction valves and ensure that no system circuits are isolated by closed solenoid valves or non-

return valves etc. First introduce dry oxygen free nitrogen (OFN) at a pressure of 3 barg to the system and check

for audible leaks. If all components and pipe-work is sound, before proceeding to the second stage it is necessary

that the following components are isolated:

1. Compressors

2. Pressure Switches

3. Transducers

The test pressure should now be increased to 10 barg using dry oxygen free nitrogen in stages of no more than 3

bar at a time. Listen for audible leaks and watch the gauge for pressure loss at each increment. Use leak detection

soapy water at each joint to identify any small leaks. Leaks encountered should be repaired with the system de-

pressurised.

When the test pressure has reached 10 bar, thoroughly test all joints and components etc. for leaks. The pressure

should then be increased to no more than the maximum leak test pressure allowed for the particular section of the

system, isolating any PRV's or controls etc. which may be susceptible to the test pressure, and all components

should again be checked for leaks.

Strength Test

Follow the above procedure then prove the system. The system should be held at test pressure for at least 15

minutes. If the pressure has not significantly reduced then the system can be slowly vented to the leak test

pressure value. At which point the system should be checked again for leaks.

After all tests are completed the system should be de-pressurised gradually.

13.2 Electrical Testing

BEFORE commencing any testing procedure, a check must be made to ensure that NO electronic or extra low

voltage devices are connected. COMPLETE isolation of these items must be achieved prior to testing.

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P4115S Rev 02