Linear expansion valve (A12, 18)

(1) Operation summary of the linear expansion valve

Linear expansion valve opens/closes through stepping motor after receiving the pulse signal from the outdoor controller board.

Valve position can be changed in proportion to the number of pulse signal.

<Connection between the indoor controller board and the linear expansion valve>

Outdoor controller board

DC12V

LEV

Red 1

3

M

2

15

6 4

 

Brown

2

[4

Blue

3

[3

Orange

4

[2

Yellow

5

[1

White

6

Connector LEV-A

Drive circuit

[4

[3

[2

[1

<Output pulse signal and the valve operation>

Output

 

 

 

Output

 

 

 

 

 

 

 

 

 

 

 

(Phase)

1

2

3

4

5

6

7

8

 

 

 

 

 

 

 

 

 

 

[1

ON

ON

OFF

OFF

OFF

OFF

OFF

ON

 

 

 

 

 

 

 

 

 

[2

OFF

ON

ON

ON

OFF

OFF

OFF

OFF

 

 

 

 

 

 

 

 

 

[3

OFF

OFF

OFF

ON

ON

ON

OFF

OFF

 

 

 

 

 

 

 

 

 

[4

OFF

OFF

OFF

OFF

OFF

ON

ON

ON

 

 

 

 

 

 

 

 

 

(2) Linear expansion valve operation

Opening a valve : 8 7 6 5 4 3 2 1 8

Closing a valve : 1 2 3 4 5 6 7 8 1 The output pulse shifts in above order.

When linear expansion valve operation stops, all output phases become OFF.

When the switch is turned on, 700 pulse closing valve signal will be sent till it goes to A point in order to define the valve position. (The pulse signal is being sent for about 20 seconds.)

Valve position (capacity)

 

 

 

When the valve moves smoothly, there is no sound or vibration

 

 

C

occurring from the linear expansion valve ; however, when the

 

 

pulse number moves from B to A or when the valve is locked,

 

 

 

 

 

 

sound can be heard than normal situation.

 

 

 

No sound is heard when the pulse number moves from B to A in

 

 

 

case coil is burn out or motor is locked by open-phase.

 

 

 

• Sound can be detected by placing the ear against the screw dri-

 

 

 

ver handle while putting the screw driver to the linear expansion

Close

Open

valve.

 

 

 

500 pulse

 

A

Opening a valve

 

all the way

 

 

 

 

 

B

Pulse number

 

 

 

 

Extra tightning (about 32 pulse)

58

Page 58
Image 58
Mitsubishi Electronics PUY-A18NHA2-BS Output pulse signal and the valve operation, Linear expansion valve operation

PUZ-A36NHA2-BS, PUY-A12NHA2, PUY-A42NHA2-BS, PUY-A30NHA2, PUZ-A36NHA2 specifications

Mitsubishi Electronics has long been a leader in the HVAC industry, and their range of air conditioning units, including the PUY-A24NHA2, PUZ-A24NHA2, PUY-A24NHA2-BS, PUZ-A42NHA2-BS, and PUY-A42NHA2, exemplifies their commitment to innovation and energy efficiency. These models are designed to provide optimal climate control for both residential and commercial applications, ensuring comfort throughout the year.

One of the defining features of these models is their advanced inverter technology, which allows for precise temperature control and reduced energy consumption. The inverter technology adjusts the compressor speed according to the cooling load, significantly lowering operating costs compared to traditional fixed-speed systems. This means that users can enjoy consistent comfort without worrying about surging energy bills.

The PUY and PUZ units come equipped with powerful indoor and outdoor components that enable efficient heat exchange. These systems provide excellent performance even in extreme weather conditions, with reliable operation at low ambient temperatures. This capability ensures that you can maintain a comfortable environment, no matter the season.

Additionally, the models are designed with quiet operation in mind. The outdoor units incorporate noise-reduction technology, ensuring that the systems operate at minimal sound levels. This is especially beneficial for residential areas or office environments, where maintaining a peaceful atmosphere is crucial.

Mitsubishi Electronics has also integrated smart technology into these units. With options for remote control via Wi-Fi, users can manage their air conditioning settings from anywhere, using their smartphones or tablets. This integration enhances user convenience and allows for more efficient scheduling and energy management.

These models are also known for their environmentally friendly refrigerants, such as R410A, which contribute to lower global warming potential and align with modern sustainability practices. By choosing Mitsubishi's PUY and PUZ series, consumers not only prioritize their comfort but also contribute to environmental conservation.

In summary, the Mitsubishi Electronics PUY-A24NHA2, PUZ-A24NHA2, PUY-A24NHA2-BS, PUZ-A42NHA2-BS, and PUY-A42NHA2 air conditioning units are equipped with cutting-edge technology, offering energy efficiency, quiet operation, and smart functionality. Whether for residential or commercial use, these units are designed to meet the demands of modern climate control while prioritizing energy savings and sustainability.