(4)With the “Lo” knob of the manifold valve open, run the vacuum pump. The operation time for the vacu- um pump varies with tubing length and the capacity of the pump. The following table shows the amount of time for evacuation:

Table 6

Required time for evacuation when

26.4 gal/h (100 liter/h) vacuum pump is used

If tubing length is

If tubing length is

less than 33 ft. (10 m)

more than 33 ft. (10 m)

 

 

10 min. or more

15 min. or more

 

 

NOTE

To prevent other refrigerants from being mistakenly charged to units which use R410A, the size of the charge port on the service valve is different from the one for other refrigerant types. For servicing such as recharging, the specified charging hose, manifold and vacuum pump adapter (with reverse flow prevention) for R410A must be used.

NOTE

(5) With the vacuum pump still running, close the “Lo”

The required time in Table 6 is calculated based on the

knob of the manifold valve. Then stop the vacuum

assumption that the ideal (or target) vacuum condition

pump.

is around 0.193 psi (10 mmHg abs.).

(6) With the hex wrench, turn the valve stem on the

 

narrow tube service valve counter-clockwise by

90° (1/4 turn)

90 degrees (1/4 turn) for 10 seconds, and then turn

Narrow tube

 

the stem clockwise to close it again. (Fig. 28)

Hex wrench

 

 

CAUTION

Be sure to completely insert the hex

Wide tube

wrench before attempting to turn the valve.

 

 

 

(7) Leak test all joints at the tubing (both indoor and outdoors) with

 

soapy water. Bubbles indicate a leak. Tighten the joint more

 

when leaks, then check if there is no leak. Be sure to wipe off the

Valve cap

soap with a clean cloth.

Vacuum hose to manifold valve

 

Fig. 28

(8)With the hex wrench, turn the wide tube service valve stem counter-clockwise to fully open the valve.

(9)Turn the narrow tube service valve stem counter-clockwise to fully open the valve.

(10)Loosen the vacuum hose connected to the wide tube service port slightly to release the pressure. Then, remove the hose.

CAUTION

This may cause the refrigerant gas to leak. In order to avoid this, take off the hose quickly.

(11)Fasten the valve cap on the wide tube service port securely with an adjustable wrench or box wrench. Next, mount the valve cap on the service valve and tighten it to 170 lbs·in (200 kgf·cm) with a torque wrench. This process is very important to prevent gas from leaking from the system.

(12)Test run the air conditioner. (See next page.)

(13)While the air conditioner is running, apply liquid soap to check for any gas leaks around the service valves or caps.

(14)If there is no leakage, stop the air conditioner.

(15)Wipe off the soap on the tubing.

This completes air purging with a vacuum pump and the air condi- tioner is ready for actual operation.

19

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Page 109
Image 109
Panasonic CZ-18BT1U, CU-KE12NK1 Degrees 1/4 turn for 10 seconds, and then turn, Stem clockwise to close it again. Fig
Page 108 Page 110

CZ-18BT1U, CS-KE12NB41, CS-KE18NB4UW, CU-KE18NKU, CU-KE12NK1 specifications

The Panasonic CS-KE18NB4UW and CU-KE12NK1, along with the CS-KE12NB41, CZ-18BT1U, and CU-KE18NKU, represent a suite of advanced air conditioning solutions built with cutting-edge technologies designed to provide optimal comfort, energy efficiency, and air quality in various settings.

One of the standout features of this lineup is the inverter technology. Inverter air conditioners adjust the compressor speed to maintain the desired temperature efficiently. This leads to significant energy savings compared to traditional air conditioners, which tend to frequently cycle on and off, consuming more power. By continuously regulating the temperature, the Panasonic units not only save electricity but also prolong the lifespan of the compressor.

Another noteworthy characteristic is the nanoe™ technology integrated into some of these models. Nanoe™ technology uses hydroxyl radicals to purify the air, minimizing harmful bacteria and allergens. This makes the Panasonic units particularly suitable for users with allergies or respiratory issues, providing a cleaner and healthier indoor environment.

In terms of design, these models are sleek and compact, allowing them to fit seamlessly into any room decor, whether in a home, office, or commercial space. The quiet operation is another advantage, making them ideal for bedrooms and study areas where minimal noise is essential.

Furthermore, the CS-KE18NB4UW and CU-KE12NK1 offer a range of powerful cooling and heating capacities, making them versatile solutions for various climate conditions. The cold climate performance ensures consistent heating in colder regions, while the robust cooling capabilities make them perfect for hot summer months.

The user-friendly features include a smart remote control system, allowing users to adjust settings with ease from a distance. Some models are equipped with Wi-Fi capability, enabling integration with smart home systems for enhanced control and programmability.

In conclusion, the Panasonic CS-KE18NB4UW, CU-KE12NK1, CS-KE12NB41, CZ-18BT1U, and CU-KE18NKU air conditioning units exemplify innovation and efficiency. With their inverter technology, air purification features, compact designs, and smart functionalities, they stand out as ideal choices for maintaining comfortable and healthy indoor environments throughout the year.
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