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Warning:

• The unit must not be installed by the user. Ask a dealer or an authorized

technician to install the unit. If the unit is installed incorrectly, water leakage,

• This appliance is intended to be used by expert or trained users in shops, in

light industry and on farms, or for commercial use by lay persons.

• For installation work, follow the instructions in the Installation Manual and

erant. The R410A refrigerant in the HFC system is pressurized 1.6 times the
pressure of usual refrigerants. If pipe components not designed for R410A
refrigerant are used and the unit is not installed correctly, the pipes may burst
and cause damage or injuries. In addition, water leakage, electric shock, or

• When installing the unit, use appropriate protective equipment and tools for

safety. Failure to do so could cause injuries.

• The unit must be installed according to the instructions in order to minimize

the risk of damage from earthquakes, typhoons, or strong winds. An incor-
rectly installed unit may fall down and cause damage or injuries.

• The unit must be securely installed on a structure that can sustain its weight.

If the unit is mounted on an unstable structure, it may fall down and cause
damage or injuries.

• If the air conditioner is installed in a small room, measures must be taken to

prevent the refrigerant concentration in the room from exceeding the safety
limit in the event of refrigerant leakage. Consult a dealer regarding the appro-
priate measures to prevent the allowable concentration from being exceeded.
Should the refrigerant leak and cause the concentration limit to be exceeded,
hazards due to lack of oxygen in the room may result.

• Ventilate the room if refrigerant leaks during operation. If refrigerant comes

local regulations and the instructions given in this manual. The units must be
powered by dedicated power lines and the correct voltage and circuit breakers

• Use C1220 copper phosphorus, for copper and copper alloy seamless pipes,

to connect the refrigerant pipes. If the pipes are not connected correctly, the
unit will not be properly grounded and electric shock may result.

securely with no tension applied on the terminal connections. Also, never
splice the cables for wiring (unless otherwise indicated in this document).

the cover panel is mounted incorrectly and dust and moisture enter the unit,

• When installing or relocating, or servicing the air conditioner, use only the

any other refrigerant and do not allow air to remain in the lines.

If air is mixed with the refrigerant, then it can be the cause of abnormal high

pressure in the refrigerant line, and may result in an explosion and other
hazards.

mechanical failure or system malfunction or unit breakdown. In the worst
case, this could lead to a serious impediment to securing product safety.

• Use only authorized accessories and ask a dealer or an authorized technician

to install them. If accessories are incorrectly installed, water leakage, electric

• The user should never attempt to repair the unit or transfer it to another loca-

may result. If the air conditioner must be repaired or moved, ask a dealer or
an authorized technician.

• After installation has been completed, check for refrigerant leaks. If refriger-

portable cooking range, poisonous gases will be released.

• The appliance shall be installed in accordance with national wiring regulations.
• If the supply cord is damaged, it must be replaced by the manufacturer, its

• When opening or closing the valve below freezing temperatures, refrigerant

may spurt out from the gap between the valve stem and the valve body, result-
ing in injuries.

1. Safety precautions

tions”.

Please report to or take consent by the supply authority before connec-

tion to the system.

PUMY-P·VKM series complying with IEC/EN 61000-3-12
PUMY-P·VKM series and PUMY-P·YKME series are designed for use in

the residential, commercial and light-industrial environment.

PUMY-P·YKM series is designed as professional equipment.
When connecting an ATW indoor unit (EHST20C and EHSC series) with

a 3-phase model, use PUMY-P·YKME4.

Caution:

• Do not vent R410A into the atmosphere.