Hitachi RAS-10FSXN1E Bedienungsanleitung Seite 36

PIPING WORK AND REFRIGERANT CHARGE
Judgement result indication
7-segment Indication Result
Sufficient
refrigerant
Excessive
refrigerant
Insufficient
refrigerant
Abnormal
termination
?
N O T E
The 7-segment indication during the check operation may be changed to the protection control code by the activation of protection control. However, it
is normal. As for the protection control code, refer to the sheet attached to the inside of the outdoor unit service cover.
8.6.1 Maximum permitted concentration of hydrofluorcarbon (HFC) refrigerant
!
D A N G E R
• Fitters and the designers of the installations must strictly
observe local and national legislation, and local codes regarding
safety requirements in the event of refrigerant leaks.
• In the event of a leak, the gas will spread around the room,
displacing the air, and could therefore result in asphyxia.
• Special attention should be given to areas where the refrigerant
may be deposited and stay in the room, such as basements or
similar, as it is heavier than air.
The R410A refrigerant gas, used in the equipment, is fireproof
and not toxic.
The maximum permitted concentration of HFC R410A gas in
the air is 0.44 kg/m , in accordance with standard EN378-1.
3
Therefore, efficient measures should be adopted to ensure the
concentration of R410A gas in the air is kept below 0.44 kg/m
the event of a leak.

Calculation of the refrigerant concentration
1 Calculate the total quantity of refrigerant R (kg) charged
in the system; to do so, connect all the indoor units of the
rooms in which you wish to have air conditioning.
2 Calculate the volume V (m
3 Calculate the refrigerant concentration C (kg/m
according to the following formula:
R: Total quantity of refrigerant charged (kg).
V: volume of the room (m ).
3
C: concentration of refrigerant (= 0.44 kg/m
26 PMML0392B rev.1 - 07/2016
The refrigerant amount is sufficient.
•
Turn the pin number 4 of DSW5 OFF and perform the test run.
The refrigerant amount is excessive.
•
Calculate the additional refrigerant amount according to the piping length. Collect the refrigerant using
a collector and charge the correct refrigerant amount.
The refrigerant amount is insufficient.
•
Check if the additional refrigerant has been charged.
•
Calculate the additional refrigerant amount according to the piping length and charge the refrigerant.
Find out the cause of abnormal termination as shown below. After resolved the cause of abnormal
termination, restart the check operation.
1
Is number 4 pin of DSW5 ON before turning on the power supply?
2
Are all indoor units ready and waiting, before turned ON number 4 pin of DSW5?
3
Is the outdoor ambient temperature within the applicable range (0 to 43ºC DB). (In some cases,
when the connected indoor unit number exceeds the recommended number and the outdoor ambient
temperature exceeds 35ºC DB, this check operation cannot be performed.)
4
Is the total indoor units operation capacity 30% (indoor units capacity ratio) or less?
5
Is the pin number 4 of DSW4 (compressor forced stoppage) OFF?
) of each room.
3
) of the room
3
R / V = C
for R410A gas).
3
Remarks

Countermeasures in the event of refrigerant
leaks
Pay attention to the critical gas concentration to avoid accidental
refrigerant gas leakage before installing air conditioning
systems.
In the case that the calculated critical concentration is higher
than the maximum permissible concentration of HFC gas
(R410A) in air, take the following actions.
1 Provide each effective opening at the wall or door for
ventilation to next door so that the critical gas concentration
can be maintained lower than the above value. (Provide an
opening more than 0.15% of floor surface at the lower part
of a door.)
in
3 2 Opening without shutter to permit the circulation of fresh air
in the room.
3 A fan with a capacity of at least 0.4 m
of Japanese refrigerant ( = volume displaced by the
compressor / 5.7 m
(gas leakage detector) in the air conditioning system which
uses the refrigerant.
/minute per tonne
3
/h) or greater, connected to a gas sensor
3