Nissan Rogue (T33) 2021-Present Service Manual: Kr15ddt :: System Description

Component Parts

Refrigeration System

Component Parts Location

In the heater & cooling unit assembly

No.	Location	Function
	Internal heat exchanger pipe	Refer to Internal Heat Exchanger Pipe.
	A/C Compressor	Refer to A/C Compressor.
	Refrigerant pressure sensor	AUTOMATIC AIR CONDITIONING: Refer to Refrigerant Pressure Sensor. MANUAL AIR CONDITIONING: Refer to Refrigerant Pressure Sensor.
	Condenser	Refer to Condenser.
	Liquid Tank	Refer to Liquid Tank.
	Evaporator	Refer to Evaporator.
	Expansion Valve	Refer to Expansion Valve.

A/C Compressor

Intakes, compresses, and discharges refrigerant, to circulate refrigerant inside the refrigerant cycle.

Condenser

DESCRIPTION

• A sub-cool condenser that combines a parallel-flow condenser and liquid tank in the sub-cool cycle is used.

• Cools refrigerant discharged from compressor, and transforms it to liquid refrigerant.

STRUCTURE AND OPERATION

The sub-cool section is installed on the condenser, and the liquid refrigerant that exits the liquid tank is further cooled by the condenser sub-cool section, increasing the amount of heat that the liquid refrigerant can absorb and improving cooling performance.

Liquid Tank

• A liquid tank compatible with HFO-1234yf refrigerant is used.

• Eliminates foreign matter in refrigerant, and stores temporarily liquid refrigerant.

Heater & Cooling Unit Assembly

This system utilizes a heater & cooling unit that combines heater unit, and cooling unit.

Expansion Valve

The refrigerant temperature is detected by the temperature sensing part located in low-pressure refrigerant path inside expansion valve. The lift amount of high-pressure side ball valve is changed to regulate the refrigerant flow.

Evaporator

• A thin laminate pipeless evaporator is used.

• The mist from liquid refrigerant transforms to gas by evaporation by the air conveyed from blower motor. The air is cooled by the heat by evaporation.

Internal Heat Exchanger Pipe

Transfers heat out of the liquid refrigerant, sub cooling it below condensation temperature.

System

System Diagram

System Description

REFRIGERANT CYCLE

Refrigerant Flow

The refrigerant from the A/C compressor, flows the condenser with liquid tank, the evaporator, and returns to the A/C compressor. The refrigerant evaporation in the evaporator is controlled by an expansion valve.

Freeze Protection

• AUTOMATIC AIR CONDITIONING SYSTEM: Refer to A/C Compressor Control.

• MANUAL AIR CONDITIONING SYSTEM: Refer to A/C Compressor Control.

REFRIGERANT SYSTEM PROTECTION

Refrigerant Pressure Sensor

• The refrigerant system is protected against excessively high- or low-pressures by the refrigerant pressure sensor, located on the high-pressure pipe. The refrigerant pressure sensor detects the pressure inside the refrigerant line and sends the voltage signal to the ECM if the system pressure rises above, or falls below the specifications.

• ECM turns the A/C relay to OFF and stops the A/C compressor when the high-pressure side detected by refrigerant pressure sensor.

Pressure Relief Valve

The refrigerant system is also protected by a pressure relief valve, located in the rear head of the A/C compressor. The release port on the pressure relief valve automatically opens and releases refrigerant into the atmosphere when the pressure of refrigerant in the system increases to an unusual level [more than 3,800 kPa (38.0 bar, 38.8 kg/cm², 551 psi)].