Mitsubishi Electronics P Mitsubishi Electric’s Cleaning-Free Technology, Silent Operation

Silent Operation Technology

Cleaning-Free, Pipe Reuse Technology

Indoor Unit

Ultra Silent Indoor Unit Operation

Quiet 4 way Cassette

Q.

A.

Noise level during normal operation is only 21dB for the new MSZ-FA/GA25, making it one of the quietest indoor units in the industry. Inside the unit, the multi- angled heat exchanger has a modified fin shape that reduces air resistance for a smoother, quieter airflow. The wide fan diameter produces greater airflow at lower fan speeds and the uneven pitch

Only

dB

MSZ-FA/GA25

Reduced airflow resistance		Only
and	a redesigned shape of
the	heat exchanger fin

make very quiet operation.

dB

PLA-RP35AA

In general, why is the reuse of existing pipework not allowed for models with R407C or R410A HFC refrigerant?

This is because existing pipework contains moisture and chloride residue that, when mixed with compressor's ester oil, can result in a chemical reaction. Additionally, refrigerant oil sludge and corrosion within the compressor can clog up the refrigerant circuit.

between each fan blade helps to eliminate annoying noise. What’s more, the remote controlled vane significantly decreases downward air resistance for much lower noise levels.

Mitsubishi Electric’s Cleaning-Free Technology

MSZ Series, MXZ Series (except for MXZ-8A140VA),
PUHZ-RP35/50/60/71 Features	PUHZ-RP100/125/140/200/250 Features
New HAB Refrigerant Oil	Exclusive Replacement Filter

Outdoor Unit

Silent Operation

( PUHZ and Power Multi )

Operation has been made very silent by improvements to the design of the fan blades and the new grille shape. The outdoor unit is even more silent when outside temperature drops as it automatically switches to low-noise mode to reduce operating noise by 3dB.

1/2

noise

DAYNIGHT

50dB 47dB*

in	in
cooling mode	cooling mode
PUHZ-RP125/140:

Low-Noise Priority Function

A low-noise priority function is also available by connecting a commercially available timer or a selector switch. When a signal is received from the timer or the switch, the unit runs in low-noise priority mode.

Reduction of

Refrigerant Noise

Refrigerant condensed in the condenser of the outdoor unit is heat-exchanged with the low temperature refrigerant inside the accumulator, and subcooled. Doing this way, refrigerant will reach the LEV (Linear Expansion Valve) while keeping the optimum state even when the branch box is installed far from the outdoor unit.

Our Inverter-driven models are the first in the industry to use hard alkyl benzene (HAB) oil — a unique refrigerant oil that degrades very slowly — for refrigeration. Employing our exclusive cleaning-free technologies such as a specially developed high-efficiency oil separator and optimum distribution of heat exchangers to prevent oil stagnation, we have made it possible to reuse previously installed pipeworks.

Refrigerant circuit lasts longer with less deterioration using the new HAB refrigerant oil*

		Characteristics of the new
		refrigerant oil
		Name: HAB Oil
		Oil characteristics:
		1 Difficult to dissolve in
		the refrigerant.
		2 High chemical and heat
		stability, uniform quality,
		high fluidity and viscosity.
Colour of the oil	Colour of the oil at
at initial stage	10 years after use

*Data taken from our lab: Test results equivalent to 10 years worth of use

The refrigerant oil (ester oil) used for the 10.0~25.0kw models will degrade when mixed with chemicals such as chloride found in existing pipes. To prevent oil degradation and make it possible to reuse existing pipes, Mitsubishi Electric has developed an exclusive replacement filter that uses activated charcoal to soak up chlorides.

Replacement filter (conceptual diagram)

Activated carbon

(absorbs chlorine and other chemicals)

Refrigerant Refrigerant

Inlet Filter Outlet

C

This has enabled to reduce the refrigerant noise at the LEV section, and has optimized the refrigerant distribution to each indoor unit, proving great effectiveness in the installation environment with a large piping loss (pressure loss) due to a long piping length or a large height difference.

For tenants /owner	• Reduces installation time for less disruption of business.
	• Saves installation costs.

Advantages
For installer	• Installation time is reduced significantly, so you have more time to do other work.
	• Not necessary to find proper pipings for R410A refrigerant.
	• Time-consuming pipe cleaning is not necessary, even if the owner wants to
	reuse the existing pipework.

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