MICRO-AIR Artic Air 24 Guía de instalación descargar pdf (Pagina 37)

DO NOT HAVE SCHRADER TYPE VALVE INSERTS. The access ports are isolated only when

the valve stem is in the fully back-seated position.

Facing the front of the condensing unit, the discharge (high pressure) valve has a hexagonal

body and is located to the left of the square bodied suction (low pressure) valve. Your gauge set

will probably have color coded hoses. If so, connect the blue hose to the suction valve and the

red hose to the discharge valve. The center (white) hose is used to attach a refrigerant bottle,

recovery machine or vacuum pump.

With your hoses attached to the Rotalock valve access ports, you are now ready to begin leak

checking,

Leak Checking

Before evacuating the system and opening the Rotalock valves on the condensing unit, it is

important to be absolutely certain that the tubing you have run is 100% leak-free. If you have

followed our soldering guidelines closely you may well find that your system has no leaks at all.

However, soldering on a boat can be tough so it is worth taking time now to be verify the quality

of your joints. Finding major leaks is generally quite easy. Small leaks on the other hand can be

very difficult to find even for professionals. This section will provide some pointers on how to find

out whether or not your system is leaking and help you avoid some common pitfalls of leak

detection.

If you have more than one holding plate zone (freezer and refrigerator), then check valves are

installed in the suction refrigerant lines (refer to the “Running the Copper Tubing” section). Since

the solenoid valves are normally closed, it is important that you energize all of the freezer and

refrigerator solenoid valves at the control tee prior to beginning your leak checking procedure

(Note: air conditioning is not affected). Opening the solenoid valves creates access to leak check

the area between the solenoid valves and the check valves. To energize the solenoids, you need

to apply power to both sides of the solenoid leads. The polarity is not important, positive and

negative may be connected in either order. Once you have the solenoids energized, leave them

powered up throughout your leak checking and evacuation process. When you are done leak

checking and evacuating, you need to remove the direct power and connect the solenoid power

leads to their appropriate system connections.

Tools of the Trade

There is really no one approach that works “best” for finding leaks. Most experienced

professionals use a combination of tools including:

● Electronic Gas Detectors - These are electronic meters (typically hand-held) that sense

the presence of very small amounts of specific refrigerant gas.

Advantage - About the only way to find a “hidden” leak which is out of visual range or

direct access.

Disadvantage - They are extremely sensitive and can be influenced by other common

gases (such as that found near some foams and adhesives). Interpreting the results can

be frustrating on very small leaks.

● Bubble Detectors - This is the age old soap bubble trick. The reliability of this method

depends on having the correct viscosity in your soap/water mixture and your ability to see

100% of the soldered area. This last one can be a challenge on a boat.

Advantage - Low tech, low cost and surprising effective if you are very careful and

patient.

Disadvantage - Easy to miss tiny leaks and completely useless if you can’t actually see

ALL parts of the joint.

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