Airwell RT4D 20 [3/56] Technical features continued
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Airwell RT4D 20 [3/56] Technical features continued

Airwell RT4D 60 [3/56] Technical features continued
Page 3
Technical Features (continued)
The outdoor coil (BCO) is divided in two vertical coils, V-formed,
when the RT4Ds has two circuits. This unique feature eases the
defrost of one circuit without disturbing the heating of the other
circuit.
There is one drain pan under both outdoor coils.
The drain pan is equipped with an electric heater (RE) to melt
the ice during the defrost cycle in winter.
One refrigerant pressure transducer (TPH) monitors the pressure
in the outdoor coil (on heating and cooling mode). It opens (or
closes) the auxiliary outdoor air dampers (D4) to allow more (or
less) outdoor air to mix with the exhaust air before the outdoor
coil. This function insures a safe and efficient operation of the
heat-pump.
The indoor coil (BEV) allows for high dehumidification on
cooling mode.
The drain pan under the indoor coil is with positive slope,
removable for hygienic cleaning.
Most brazing, fittings and refrigerant devices are assembled in
the technical compartment to ease service without disturbing
the operation of the RT4D.
Each refrigerant circuit is protected by a two stages high
pressure control (hp1). The lower stage allows for remote
reset and the higher stage for manual reset at the RT4D. A low
pressure control is included (Lp1).
On very hot summer days, the tandem Compressors avoids
a total cooling Cut-Out when overheating by taking one
compressor out of order. A refrigerant high-pressure safety
valve (SV) is located on the liquid receiver.
One compressor can be equipped with optional inverter (to be
used with reciprocating compressor) to modulate the heating or
cooling capacity from sizes 20 to 180.
A G4 air filter protects the outdoor-coil.
VR1
RL
C C
SPL
RV
MBP
SL
MHP
RM
HP1
OLC1 OLC2
RC2RC1
LP1
TPH
VEX
VR2
RE
BCO
SV
TZ1
TZ2
BEV
C Scroll compressor SL Liquid separator in the suction line SPL Sight glass
OLC1-OLC2
Overload thermal protection VH1 Four way valve for reverse cycle SV Refrigerant safety valve
RC1-RC2 Oil electrical heater TPH Pressure transducer 4-20 ma/0-30 bar BEV Indoor coil
LP1 Low pressure switch TZ1-TZ2 Dry expansion thermostatic valves VEX Outdoor axial fans
HP1 High pressure switch VR1-VR2 Refrigerant check valves BCO Outdoor coil
MBP Low pressure manometer RV Liquid receiver RE Electric heater for outdoor drain pan
MHP High pressure manometer RL Liquid line check valve
RM Discharge line check valve FE Drier liquid filter

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