Hitachi RPI-1.0FSG1 - Page 373

5-13
FIELD WORK INSTRUCTION
Room R (kg)
V (m
3
)C (kg/m
3
)
Countermeasure
A50300 0.17 -
B 110 1000 0.11 -
C60175 0.34
0.06m
2
Opening
D60175 0.34
0.06m
2
Opening
C + D60350 0.171 -
E60100 0.6
2m
3
/min. Ventilator Linked with
Gas Leak Detector
If local codes or regulations are specified, follow them.
<Example>
British Standard BS4434 1989
R22 Commercial Office Building Class D Occupancy
MR = C✕V
MR: Maximum Charge or Leakage of Refrigerant (kg)
C: Maximum Allowable Concentration = 0.17 (kg/m
3
)
V: Volume of Space (m
3
)
<Example>
2 4 4 5 5 5 5 3 3
20HP 18HP
Height
2.5m
System A
Refrigerant: 60kg
System B
Refrigerant: 50kg
System A
Outdoor Unit
System B
Outdoor Unit
Floor
40m
2
Floor
70m
2
Floor
70m
2
Floor
400m
2
Floor
120m
2
Opening: 0.06m
2
Gas Leak Detector
Ventilator 2m
3
/min
ED D B A