Hitachi Set Free mini-HNRQ1 Series, Service Manual

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II
<Signal Words>
● Signal words are used to identify levels of hazard seriousness.
Definitions for identifying hazard levels are provided below with their respective signal words.
DANGER
!
: DANGER
indicates a hazardous situation which, if not avoided, will result in death
or serious injury.
WARNING
! :
WARNING indicates a hazardous situation which, if not avoided, could result in
death or serious injury.
NOTICE
:
NOTICE , used with the safety alert symbol, indicates a hazardous situation which, if
not avoided, could result in minor or moderate injury.
NOTE : NOTE is useful information for operation and/or maintenance.
DANGER
!
● Do not perform installation work, refrigerant piping work, drain pump, drain piping and electrical
wiring connection without referring to our installation manual. If performed without following the
instructions, it may result in a system leakage, electric shock or a fire.
● Do not pour water into the indoor or outdoor unit. These products are equipped with electrical parts.
If poured, it will cause a serious electrical shock.
● Do not open the service cover and the PCB for the indoor and outdoor unit without turning OFF the
main power supply, this may lead to serious safety accidents.
● Do not touch or adjust safety devices inside the indoor or outdoor units. If these devices are touched
or readjusted, serious accidents may occur.
● Refrigerant leakage can cause difficulty with breathing due to insufficient air. If a refrigerant leakage
is found, immediately turn OFF the main power supply, extinguish any open flame, and then contact
the service dealer.
● Make sure to perform air-tight testing.
● The refrigerant R410A used in this product (fluorocarbon) is not flammable, non-toxic, and odourless.
If there is refrigerant leakage, exposure to open flame produces toxic gases. Also, the refrigerant
gas is heavier than air, if the area is filled with refrigerant gas, it may cause suffocation to the people
in the vicinity.When conducting leak detection and air-tight testing, filling with oxygen, acetylene or
flammable and toxic gas may cause explosion. Nitrogen is recommended for this test.
● The refrigerant safety leakage standard for construction and operation systems are determined as
per local regulations or standards.
● Use a medium induction speed above ELB (Earth Leakage Breaker with action time of 0.1 seconds
or less). Otherwise, this may cause electric shock or fire.
● Do not install the product in places where there is high density of oil mist, flammable gas, salt spray,
or toxic gases (such as sulphide), and so on.
● During installation, connect the refrigerant pipe firmly before the compressor starts running. For
maintenance, stop the compressor before moving, handling and removing the refrigerant pipe.
● Do not short-circuit the protective devices (such as pressure switches and so on) during operation.
Otherwise it may cause a fire or explosion.