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250
Range below the limit concentration
of 0.42 kg/m
3
200
(Countermeasures Not Needed)
150
100
50
0
10
20
30
40
After calculation, the room to install this unit is proved
not to keep the gas concentration lower than the limit
value. However, the air conditioner should be installed
in this room from unavoidable circumstances, each of
the following countermeasures should be taken.
Outdoor Unit
Refrigerant Cycle
Indoor Unit
Room where the refrigerant leakage occurs
(Whole refrigerant in the cycle flows out.)
*1
Provide an opening
order not to exceed the permissible concentration.
*1. It is opening without door or opening at the top or bottom of door
with floor space more than 0.15%.
NOTES:
<Example>
Refrigerant Charge: 60kg
The Smallest
Room
Medium-sized
Small Room
Room
Mechanical Ventilation Equipment + Gas Leakage Detector & Alarm System
•
The quantity of refrigerant gas leakage against
each room should be calculated as 60kg each.
•
The refrigerant concentration must be below
3
0.42 kg/m
for each room.
The installer and system specialist shall secure against
leakage according to local regulations or standards.
The following standards may be applicable, if local
regulations are not available.
International Organization for Standardization,
ISO5149 or European Standard, EN378 or Japan
Standard, KHKS0010.
A16381E84N-rev.1
Range above the limit concentration
3
of 0.42 kg/m
(Countermeasures Needed)
50
60
70
80
90 100 110 120 130 140 150
Total Quantity Charged of Refrigerant (kg)
Refrigerant Flow
for ventilation between rooms in
Refrigerant Piping
Outdoor Unit
Indoor Unit
Large Room
7. Air-Tight Test and Additional Refrigerant Charge
8. Test Run
Test run should be performed according to item 8.2. And
use Table 8.1 for recording test run.
WARNING
•
An electrical shock will occur by residual voltage.
Turn OFF the power source completely before
starting the maintenance for electrical parts.
Check to ensure that no residual voltage exists after
turning OFF the power source.
•
Check to ensure that each wire is correctly connected
at each phase of power supply. If it is incorrectly
connected, electrical parts will be damaged, the unit
will not operate and the alarm code will be indicated.
In this case, connect each wire correctly.
•
Do not operate the system until all the check points
have been cleared.
As for the test run of indoor unit, check Installation
and Maintenance Manual attached to the indoor unit.
8.1 Before Test Run
1. Check to ensure that the refrigerant piping and
communication between outdoor unit and indoor
units are connected to the same refrigerant cycle.
If not, it will cause abnormal operation and a serious
accident.
Check that the DIP switch settings of the refrigerant
cycle No. (DSW1 and RSW1 [O.U.], DSW5 and RSW2
[I.U.]) and the unit number (RSW) for the indoor units
apply to the system.
Confirm that the DIP switch settings on the printed
circuit board of the indoor units and the outdoor units
are correct. Especially, pay attention to the setting
of outdoor unit No., the refrigerant cycle No. and the
end terminal resistance. Refer to Chapter 6. Electrical
Wiring.
2. Check to ensure that the electrical resistance is
more than 1 megohm, by measuring the resistance
between ground and the terminal of electrical parts.
If the electrical resistance is less than 1 megohm, do
not operate the system until the electrical leakage is
found and repaired (Refer to "Caution for Insulation
Resistance" for details.).
Do not impress the voltage on the terminals for
communication (Outdoor Unit: TB2 1, 2, 3, 4 /
Indoor Unit: TB2 A, B, 1, 2). Otherwise, it may cause
failure.
3. Check to ensure that each wire, L1, L2, L3 and N (R, S
and T) is correctly connected to the power source.
If it is incorrectly connected, the unit will not operate
and the wired controller will indicate the alarm code
"05". In this case, check and change the phase of the
power source according to the sheet attached to the
reverse side of the service cover.
104
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