Daikin Rebel DPS003 Installation And Maintenance Manual page 17

DOT-ITB-21-8041-AC
Component Description
Variable Speed Compressor
A variable speed compressor (COMP1) is used on all Rebel
Units, DPS. On small cabinet units (3–6 Tons) the variable
speed compressor will be the only one present. On large
cabinet units (7–15 Tons) the variable speed compressor will
be on the left. The discharge of the variable speed compressor
is located on the side and the suction is located on the top.
These pipes can also be identified by recalling that suction
lines will always be larger than discharge lines. The side
discharge design is used to create a positively pressurized
crank case that returns oil to the scroll set even during low turn
down conditions. This is an efficient contrast to other products
that require intermittent oil return cycles.
Figure 12: Compressor Suction and Discharge on
Large Cabinet (7.5T) Heat Pump (DPH)
Compressor Suction Line
Compressor Discharge Line
Fixed Speed Compressor (7–15 Only)
The fixed speed compressor (COMP3) is used on all large
cabinet (7–15 Ton), DPS, units. This compressor will always be
located on the right and like the variable speed has the suction
line on the top of the dome entering the scrolls and a discharge
exiting from the side of the shell.
Figure 13: Compressor Tandem on Large Cabinet
(7.5T) Heat Pump (DPH)
Variable Speed
Compressor
(COMP 1)
www.DaikinApplied.com
Fixed Speed
Compressor
(COMP 3)
17
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 14: Receiver on Large Cabinet (7.5T) Heat
Pump (DPH)
"Vapor Bleed"
leading to SVR
Entering Receiver
from Outdoor Coil
(Cooling Mode)
Leaving Receiver
to EVI
(Cooling Mode)
FPID: 437300-3-7B-01
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IM 1125-6 • REBEL ROOFTOPS