Daikin Rebel DPS003 Installation And Maintenance Manual page 21

DOT-ITB-21-8041-AC
Suction Pressure Transducer
The Suction Pressure Transducer (PTS) is a refrigerant
pressure sensor that screws onto a Schrader fitting on the
suction line of the compressor deck. On single compressor
units (3–6T) this sensor is located on the suction line. On
tandem, two compressor units (7–15T), the PTS is located
upstream of the joint suction.
This sensor is used to ensure that the compressor does not
leave the operating envelope and is used to regulate the super
heat leaving the indoor coil and entering the compressor.
Discharge Pressure Transducer
The Discharge Pressure Transducer (PTD) is a refrigerant
pressure sensor that screws onto a Schrader fitting on
the discharge line of the compressor system. On single
compressor units (3–6T) this sensor is located on the
discharge line. On tandem, two compressor units (7–15T), the
PTD is located down stream of the joint discharge.
This sensor is used to ensure that the compressor does not
leave the operating envelope and is used to regulate the
outdoor fan speed and maintain head pressure.
Discharge Refrigerant Temperature
All Rebel units will have a Discharge Refrigerant Temperature
Sensor (DRT1 / DRT3) on the discharge line of each
compressor. This sensor is attached the piping with a metal
clip and wrapped in insulation. The purpose of this device is to
increase compressor life by preventing it from running outside
of the operating envelope.
Suction Refrigerant Temperature
All Rebel units will have a Suction Refrigerant Temperature
Sensor (SRT). This sensor is located on the suction line. Unlike
DRT1 or 3 there is only one SRT for tandem compressor
units. This sensor is used to determine the suction super heat
entering the compressor and is the control input for the EVI in
cooling mode (EVO in heating mode).
Indoor Refrigerant Temperature
Only Rebel Heat Pump units will have an Indoor Refrigerant
Temperature Sensor (IRT). This sensor is used in Heating
Mode when htgEVImethod is set to control subcooling. This
sensor is attached to the refrigerant piping downstream
(Cooling Mode) of the Indoor Expansion Valve (EVI).
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Outdoor Refrigerant Temperature
Only Rebel Heat Pumps units will have an Outdoor Refrigerant
Temperature Sensor (ORT). This sensor is used in Cooling
Mode when ClgEVOmethod is set to control subcooling. This
sensor is attached to the refrigerant piping upstream (Cooling
Mode) of the Outdoor Expansion Valve (EVO).
Figure 24: Outdoor Expansion Valve
Outdoor Expansion
Valve (EVI)
Defrost Temperature Sensor
Only Rebel Heat Pump, DPH, units will have a Defrost
Temperature Sensor (DFT). This sensor is used in Heating
Mode and Defrost Mode to determine the amount of frost
accumulated on the Outdoor Coil.
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FPID: 437300-3-7B-01
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efrIgeraTIon ysTeM
Outdoor
Refrigerant
Temperature
Sensor (ORT)
IM 1125-6 • REBEL ROOFTOPS