Refrigerant Cycle; Advanced Technology - Hitachi RWM-(H)FSN3E Technical Catalogue

2 Features and benefits

2.4.4 Advanced technology

The functionality benefits explained before (Highly efficiency system, wide capacity range and expanded working range)
are direct consequence of the advanced technology applied on all the system components.
Then, the main features on different components of the system will be detailed:
- Super high-stream fan
- Silent fan unit
- DC fan motor with outs-
tanding efficiency
Outdoor
- PWM (pulse width
unit heat
modulation) concept of
exchanger
speed control
Side-flow tech-
nology
High-efficiency heat
exchanger
(*4)
Cooling refrigerant flow
N O T E
• (*1): Only for RAS-2HVRN2 and RAS-3HVRNME-AF
• (*2): Only for RAS-(4-6)H(V)RNME-AF
• (*3): Only for RAS-(8/10)HRNME-AF. For detailed information about gas by-pass on these units, please refer it
is specific refrigerant cycle.
• (*4): Only for RWM-(2.0-10.0)FSN3E
32
TCGB0070 rev.3 - 04/2012
Reversing
valve
Check valve (*3)
Gas by-pass (*2 and*3)
Oil separator
(*3)
Sub-cooling
circuit
Compressor
Improved performance
by sub-cooling circuit
Outdoor unit
expansion valve
Heating refrigerant flow
Stop valve of
the gas pipe
High-efficiency plate
heat exchanger
- Highly efficient scroll
compressor
- High pressure shell
- Lubrication
- New design of stator
coils (*1)
- DC compressor with
neodymium magnet
- Low noise
Accumulator
(*1)
Indoor unit
Stop valve of
expansion
the liquid pipe
valve
Liquid
receiver
(*2)
Water strainer
incorporated to
protect the plate
heat exchanger
Shutdown
Water
valves
strainer
Indoor unit heat
exchanger
Water
- Low power
pump
consumption
- 3 different pump
motor speeds
Expansion
vessel
Electric
heater
- Complementary heating
for the most low ambient
temperature conditions
- 3 steps electric heater