Hitachi RAS-10FSXNPE, Instruction Manual

Page: 42 / 170

• 2 and 3 Units Combination
Indoor unit side
The refrigerant oil is stagnated to the unit stopped.
Indoor unit side
Indoor unit side
Max 300 mm
Max 300 mm
Max 300 mm
Oil trap min 200 mm Oil trap min 200 mm Oil trap min 200 mm
• 4 Units Combination
Indoor unit side
The refrigerant oil is stagnated to the unit stopped.
Indoor unit side
Oil trap min
200 mm
Oil trap min
200 mm
Oil trap min
200 mm
Oil trap min
200 mm
Max 300 mm Max 300 mm Max 300 mm Max 300 mm
3 In case that the piping length between outdoor units is 2m or
more, the oil trap for the gas pipe should be provided so that
accumulation of refrigerant oil may not occur.
• 2 and 3 Units Combination
Less than 2m
Indoor unit side
Less than 2 m
Less than 2 m
2m or More
Oil trap
min 200 mm
Oil trap
min 200 mm
Indoor unit side
Less than 2 m
Less than 2 m
2 m or more 2 m or more
• 4 Units Combination
Less than 2m
Indoor unit side
Less than 2 m
Less than 2 m
Less than
2 m
Less than 2 m
2m or More
Oil trap
min 200 mm
Oil trap
min 200 mm
Oil trap
min 200 mm
Less than
2 m
2 m or more 2 m or more
2 m or more
Less than 2 m
Less than
2 m
10 m or more
Indoor unit side
Less than
2 m
4 Place the outdoor unit pipe horizontally or with the pipe
slanted downward towards the indoor unit side so that
accumulation of refrigerant oil may not occur in the pipe.
• 2 and 3 Units Combination
Indoor unit side
Refrigerant oil accumulates in the pipe.
Indoor unit side
PIPING WORK AND REFRIGERANT CHARGE
PMML0479 rev.4 - 11/2018 20