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3 Design and function
3.1 Unit description
The RXT room air conditioners have a REMKO
RXT...DC AT outdoor unit as well as a RXT...DC IT
indoor unit.
In cooling mode, the outdoor unit serves to output
the heat extracted by the indoor unit from the room
being cooled. In heating mode, the heat taken up
by the outdoor unit can be discharged by the
indoor unit into the room to be heated. In both
operating modes, the output produced by the com-
pressor precisely matches requirements, and
thereby regulates the nominal temperature with
minimal temperature deviations. This "inverter
technology" results in energy savings over conven-
tional split systems and also reduces noise emis-
sions to a particularly low level. The outdoor unit
can be installed in an outdoor area or, providing
that certain requirements are met, an indoor area.
The outdoor unit consists of a cooling cycle with
compressor, fin condenser, condenser fan,
reversing valve and electronic expansion valve.
The outdoor unit is controlled by the regulation of
the indoor unit.
The indoor unit is designed both for both wall and
ceiling-mounted operation in indoor areas. It is
operated by an infrared remote control. The indoor
unit consists of a fin evaporator, evaporator fan,
controller and condensate tray.
B
A
4
3
5
6
1
2
3
7
8
9
Fig. 3: System layout RXT 525-1405 DC
A: Outdoor area / B: Indoor area
1: Indoor unit / 2: Outdoor unit
3: Condensate drainage line / 4: Condenser fan
5: Power supply / 6: Shut-off valve
7: Suction pipes / 8: Injection pipes
9: Control lines
Floor consoles, wall consoles, refrigerant piping,
wired remote controls and condensate pumps are
available as accessories.
Refrigerant piping is used to connect the indoor
unit to the outdoor unit.
1
EEV
RXT 1051 DC
M
M
P S H
T1
T2
T
3
TE
T5
P
S
L
T4
T3
T2
M3
M2
M1
PSL
PSH
T1
V1
M
M
TE
P S H
T1
T 2
T
3
T5
P
S
L
M1
M3
T4
T3
T2
M2
PSL
PSH
T1
V1
EEV
2
A B
A B
FLT
FLT
FLT
FLT
OEL
T5
T5
Fig. 4: Cooling cycle schematic
A: Outdoor area
B: Indoor area
1: RXT 525-685 DC
2: RXT 1055-1405 DC
M1: Condenser fan
M2: Compressor
M3: Evaporator fan IT
V1: Changeover valve C/H
EEV: Electr. expansion valve
FLT: Filter
OEL: Oil return line
PSH: High pressure switch AT
PSL: Low pressure switch AT
T1: Probe, evaporator IT
T2: Probe, air inlet IT
T3: Probe, condenser AT
T4: Probe, air inlet AT
T5: Probe, heat gas AT
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