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Receiver
Only Rebel Heat Pump units will have a receiver. Different
volumes of refrigerant are required inside the system during
Mechanical Cooling (or defrost) and Mechanical Heating.
This is the results of the charge in operating temperatures in
Cooling and Heating Mode. The receiver stores the excess
refrigerant upstream, in Cooling Mode, of the Indoor Expansion
Valve (EVI). Three refrigerant lines connect to the receiver.
In cooling mode the refrigerant leaves (Cooling Mode) the
receiver from the bottom connection on its way to the Indoor
Expansion Valve (EVI). The refrigerant enters the receiver
by the middle connection from the Outdoor Expansion Valve
(EVO). The top connection is linked to the Receiver Solenoid
Valve (SVR) and is used to bleed refrigerant vapor out of the
top of the vessel during the change over from Mechanical
Heating to Cooling Mode (or defrost).
In heating mode the refrigerant flow path will be reversed and
will enter the receiver at the bottom connection on its way from
EVI. The refrigerant will leave the receiver from the middle
connection towards EVO. The top connection will always
be a vapor bleed connected to SVR regardless of the units
operating mode.
Figure 23: Receiver on Medium Cabinet (7.5T) Heat Pump
(DPH)
Oil Separator
All DPS(H) 003–015 and 016–020 heat pumps units will have
an oil separator on the discharge line of the compressor. This
device will remove oil from the compressor discharge gas
and return it to the compressor suction line. The oil separator
has three lines entering it. The connection on the side of the
compressor is where the discharge gas enters. The hot gas
continues on to the Outdoor Coil from the connection on the
top of the separator. On the bottom is a small drain through
which the oil returns after separation to the compressor
suction. The refrigerant and oil path through the separator will
not change depending on Heating or Cooling Mode.
Figure 24: Oil Separator
Figure 25: Secondary Oil Separator
“Vapor Bleed”
“Vapor Bleed”
leading to SVR
leading to SVR
Entering Receiver
Entering Receiver
from Outdoor Coil
from Outdoor Coil
(Cooling Mode)
(Cooling Mode)
Leaving Receiver
Leaving Receiver
to EVI
to EVI
(Cooling Mode)
(Cooling Mode)
Hot Gas
Hot Gas
Entering
Entering
Outdoor Coil
Outdoor Coil
Oil Drain into
Oil Drain into
Compressor
Compressor
Suction Line
Suction Line
Discharge Gas
Discharge Gas
from Compressor
from Compressor
Secondary
Secondary
Oil Separator
Oil Separator
IM-1125-13 • REBEL ROOFTOPS
26
www.DaikinApplied.com
Refrigeration System