Manual Comfee CDDOE-12DEN7-QA3-(EU) Dehumidifier

Manual

06

When breaking into the refrigerant circuit to make repairs or for any other purpose

conventional procedures shall be used. However, it is important that best practice is

followed since flammability is a consideration. The following procedure shall be

adhered to: Remove refrigerant; Purge the circuit with inert gas; Evacuate; Purge

again with inert gas; Open the circuit by cutting or brazing.

The refrigerant charge shall be recovered into the correct recovery cylinders. The

system shall be flushed with OFN to render the unit safe. This process may need to

be repeated several times. Compressed air or oxygen shall not be used for this task.

Flushing shall be achieved by breaking the vacuum in the system with OFN and

continuing to fill until the working pressure is achieved, then venting to atmosphere,

and finally pulling down to a vacuum. This process shall be repeated until no

refrigerant is within the system. When the final OFN charge is used, the system shall

be vented down to atmospheric pressure to enable work to take place. This

operation is absolutely vital if brazing operations on the pipe-work are to take place.

Ensure that the outlet for the vacuum pump is not close to any ignition sources and

there is ventilation available.

10.Detection of flammable refrigerants

The following leak detection methods are deemed acceptable for systems

containing flammable refrigerants. Electronic leak detectors shall be used to detect

flammable refrigerants, but the sensitivity may not be adequate, or may need

re-calibration. (Detection equipment shall be calibrated in a refrigerant-free area.)

Ensure that the detector is not a potential source of ignition and is suitable for the

refrigerant used. Leak detection equipment shall be set at a percentage of the LFL

of the refrigerant and shall be calibrated to the refrigerant employed and the

appropriate percentage of gas (25 % maximum) is confirmed.

11.Leak detection methods

Check that cabling will not be subject to wear, corrosion, excessive pressure,

vibration, sharp edges or any other adverse environmental eects. The check shall

also take into account the eects of aging or continual vibration from sources such

as compressors or fans.

9.Cabling

12.Removal and evacuation

Under no circumstances shall potential sources of ignition be used in the searching

for or detection of refrigerant leaks. A halide torch (or any other detector using a

naked flame) shall not be used.

removed/extinguished. If a leakage of refrigerant is found which requires brazing, all

of the refrigerant shall be recovered from the system, or isolated (by means of shut

o valves) in a part of the system remote from the leak. Oxygen free nitrogen (OFN)

shall then be purged through the system both before and during the brazing process.

13.Charging procedures

In addition to conventional charging procedures, the following requirements shall be

followed. Ensure that contamination of dierent refrigerants does not occur when

using charging equipment. Hoses or lines shall be as short as possible to minimise the

amount of refrigerant contained in them. Cylinders shall be kept upright.

Ensure that the refrigeration system is earthed prior to charging the system with

refrigerant. Label the system when charging is complete (if not already).

Extreme care shall be taken not to overfill the refrigeration system. Prior to

recharging the system it shall be pressure tested with OFN. The system shall be leak

tested on completion of charging but prior to commissioning. A follow up leak test

shall be carried out prior to leaving the site.

Before carrying out this procedure, it is essential that the technician is completely

familiar with the equipment and all its detail. It is recommended good practice that

all refrigerants are recovered safely. Prior to the task being carried out, an oil and

14.Decommissioning

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 pipe-work. If a leak is suspected, all naked flames shall be

Rating

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