Hitachi RAS-8-FSNM - ELECTRICAL WIRING

8.6 MAXIMUM PERMISSIBLE CONCENTRATION OF HYDROFLUOROCARBON (HCF)
REFRIGERANT
• Caution on Refrigerant Leakage
Speciers/installers have responsibility to follow local codes
and regulation which specify safety requirements against
refrigerant leakage
• Maximum Permissible Concentration of HCFC/HFC Gas
The refrigerant R410A, charged in the SET-FREE system,
is an incombustible and non-toxic gas. However, if leakage
occurs and gas lls a room, it may cause suffocation.
The maximum permissible concentration of HCFC/HFC gas,
R410A in air is 0.44 kg/m³, according to EN378-1.
Therefore, some effective measure must be taken to lower
the R410A concentration in air below 0.44 kg/m³, in case of
leakage.
• Calculation of Refrigerant Concentration
1 Calculate the total quantity of refrigerant R (kg) charged in
the system connecting all the indoor units of rooms to be
air-conditioned.
2 Calculate the room Volume V (m³) of each room.
3 Calculate the refrigerant concentration C (kg/m³) of the room
according to the following equation:
R
V
=C
R: Total quantity of charged refrigerant (kg)
V: Room volume (m
3
)
C: Refrigerant concentration 0.44 kg/m
3
for R410A
9 DRAIN PIPING

Outdoor Unit Drain-Kit (DBS-26) (Optional
Accessory)
In the case that drain water from the heat exchanger of the
outdoor unit is required to be collected, use the Drain Kit.
However, it is not recommended to use it in a snow fall area. If
the drain water is required to be collected completely, provide a
eld-supplied drain pan under the outdoor unit.
Ø32
43 mm
Outdoor unit
HP
Drain kit
quantity
(units)
8 to 12 HP DBS-26 x 2
10 ELECTRICAL WIRING
! CAUTION
• TurnOFFthemainpowerswitchoftheindoorunitandtheoutdoor
unitandwaitformorethan3minutesbeforeelectricalwiringworkor
aperiodicalcheckisperformed.
• Checktoensurethattheindoorfanandtheoutdoorfanhavestopped
beforeelectricalwiringworkoraperiodicalcheckisperformed.
• Protectthewires,electricalparts,etc.fromratsorothersmallanimals.
Ifnotprotected,ratsmaygnawatunprotectedpartsandwhichmay
leadtoare.
• Avoidthewiringsfromtouchingtherefrigerantpipes,plateedgesand
electricalpartsinsidetheunit.Ifnotdo,thewireswillbedamaged
andattheworst,arewilloccur.
• UseamediumsensingspeedtypeELB(ElectricLeakageBreaker,
activation speed of 0.1 sec. or less). If not used, it will cause an
electricshockorare.
• Fixthecablessecurely.Externalforcesontheterminalscouldlead
toare.
• ChecktheitembelowbeforeturningONthemainswitch.Incasethat
thepowersourceforoutdoorunitis415V(nominalvoltage),change
CN2(connector)toCN1oftransformer(TF)intheelectricalcontrol
boxasshowninthegurebelow.
Connector
for 220V
Connector
for 240V
• Tightlysecurethepowersourcecableusingthecordclampinside
theunit.
? NOTE
Fixtherubberbusheswithadhesivewhenconduittubestotheoutdoor
unitarenotused.
DRAIN PIPING
PMML0390B REV.0 - 11/2015 - P5416649
16