This mark means “Caution” or “Warning”. This mark means “Earth”.10.3. Indoor unit installationDUCT TYPE AIR CONDITIONERS INSTALLATION INSTRUCTIONSPrecautions in terms of safetyCarry out installation work with reliability after thorough reading of this “Precautions in terms of safety”.• Precautions shown here are differentiated between Warnings and Cautions . Those that have much chances forleading to significant result such as fatality or serious injury if wrong installation would have been carried out are listed compilingthem especially into the column of Warnings .However, even in the case of items which are listed in the column of Cautions , such items also have a chance for leadingto significant result depending on the situations.In either case, important descriptions regarding the safety are listed, then observe them without fail.• As to indications with illustration• After installation work has been completed, do not only make sure that the unit is free from any abnormal condition through theexecution of trial run but also explain how to use and how to perform maintenance of this unit to the customer according to theinstruction manual.In addition, request the customer to keep this manual for installation work together with the instruction manual.WarningsThe appliance must be installed by technician, who takes intoaccount the requirements given by ISO5149 or eventualequivalent requirements.If installing inside a small room, measures should be taken toprevent refrigerant levels from building up to criticalconcentrations in the event of a refrigerant leak occurring.Please discuss with the place of purchase for advice on whatmeasures may be necessary to prevent critical concentrationsbeing exceeded. If the refrigerant leaks and reaches criticalconcentration levels, there is the danger that death fromsuffocation may result.As to installation, request the distributor or vendor to perform it.Imperfection in installation caused by that having been carriedout by the customer himself may lead to water leakage, electricshock, fire, etc.Securely attach the protective covers for the outdoor unitconnection cables and power cord so that they do not lift upafter installation. If the covers are not properly attached andinstalled, the terminal connections may overheat, and fire orelectric shock may result.Carry out the installation work with reliability according to thismanual for installation work.Imperfection in installation leads to water leakage, electricshock, fire, etc.Switch off all supplies before accessing any electrical part.Carry out the installation work with reliability on the place thatcan bear the weight of this unit sufficiently. Insufficient strengthleads to injury due to falling of the unit.If refrigerant gas escapes during installation, ventilate theaffected area. If the refrigerant gas comes into contact withsparks or naked flames, it will cause toxic gases to begenerated.Carry out predetermined installation work in preparation forstrong wind such as typhoon, earthquake.Imperfection in installation work may lead to accidents arisenfrom overturn, etc.Once installation work is completed, check that there are norefrigerant gas in the room that can come into contact withsparks or flames from a fan heater, stove or kitchen range,which will cause toxic gases to be generated.34