Air Conditioning System Schematic Layout
A = REFRIGERANT: B = ELECTRIC VEHICLE (EV) BATTERY COOLANT: C = ELECTRIC DRIVE COOLANT: D = CLIMATE CONTROL COOLANT .
| ITEM | DESCRIPTION |
|---|---|
| 1 | Air Conditioning (A/C) isolation valve EXV2 |
| 2 | Recovery heat exchanger |
| 3 | A/C isolation valve SOV2 |
| 4 | A/C isolation valve SOV1 |
| 5 | Climate control indirect condenser |
| 6 | A/C isolation valve SOV4 |
| 7 | Electric Vehicle (EV) battery cooler |
| 8 | A/C temperature pressure sensor - Electric drive cooler |
| 9 | Electric drive cooler |
| 10 | A/C isolation valve SOV5 |
| 11 | A/C temperature pressure sensor - Recovery heat exchanger outlet |
| 12 | A/C check valve |
| 13 | A/C temperature pressure sensor - Compressor outlet |
| 14 | A/C silencer |
| 15 | Electric A/C compressor |
| 16 | A/C temperature pressure sensor - Compressor inlet |
| 17 | A/C accumulator |
| 18 | A/C service connection High Pressure (HP) |
| 19 | A/C check valve |
| 20 | Evaporator in the climate control assembly |
| 21 | A/C orifice tube |
| 22 | Front A/C isolation valve |
| 23 | A/C service connection Low Pressure (LP) |
| 24 | Heater core |
| 25 | Climate control coolant pump |
| 26 | High Voltage (HV) interior heater |
| 27 | EV battery |
| 28 | EV battery coolant pump |
| 29 | Electric drive temperature control system |
| 30 | Electric drive coolant pump |
In all modes of operation of the system, the electric Air Conditioning (A/C) compressor circulates the refrigerant around the A/C system. The HVAC control module controls the electric A/C compressor through a Local Interconnect Network (LIN). The HVAC controls the refrigerant circulated and the pressure differentials in the system using the 4 A/C temperature pressure sensors and the A/C system requests.
In all modes of operation, the HVAC monitors these pressure and temperature sensors:
- A/C temperature sensor - Low Pressure (LP) (quantity 3)
- A/C temperature pressure sensor - High Pressure (HP).
The HVAC uses the temperature pressure data from the sensors to make sure that the A/C system operates correctly. The HVAC also uses the data to monitor the refrigerant distribution in the A/C system for cooling and heating as required.
The A/C system in all modes of operation uses the following A/C components:
- Electric A/C compressor through a Local Interconnect Network (LIN) (item 15).
- Accumulator (item 17). The accumulator makes sure that the refrigerant sent to the electric A/C compressor is a vapor. The accumulator also makes sure that the correct proportion of refrigerant oil mixes with the refrigerant vapor.
- A/C temperature pressure sensor - Compressor inlet (item 16).
- A/C temperature pressure sensor - Compressor outlet (item 13).
- A/C silencer (item 14). Reduces the Noise, Vibration and Harshness (NVH) transmitted through the hoses and pipes of the A/C system.
The A/C temperature pressure sensor - Compressor inlet makes sure that there is sufficient refrigerant in the A/C system.
The A/C temperature pressure sensor - Compressor outlet makes sure that the A/C system does exceeded the maximum operating pressure.
The A/C system modes of operation are the following:
Conventional Air Conditioning System Operation for the Cooling of the Passenger Compartment: AC1
A = REFRIGERANT FLOW .
| ITEM | DESCRIPTION |
|---|---|
| 1 | Air Conditioning (A/C) isolation valve EXV2 |
| 2 | Recovery heat exchanger |
| 3 | A/C isolation valve SOV2 |
| 4 | A/C temperature pressure sensor - Compressor outlet |
| 5 | A/C silencer |
| 6 | Electric A/C compressor |
| 7 | A/C temperature pressure sensor - Compressor inlet |
| 8 | A/C accumulator |
| 9 | A/C service connection High Pressure (HP) |
| 10 | A/C check valve |
| 11 | Evaporator in the climate control assembly |
| 12 | A/C orifice tube |
| 13 | Front A/C isolation valve |
| 14 | A/C service connection Low Pressure (LP) |
The Air Conditioning (A/C) mode of operation AC1, normally only operates if the Ambient Air Temperature (AAT) is more than 0°C. The HVAC control module receives the AAT sensor data through the High Speed (HS) Controller Area Network (CAN) power mode zero from the Powertrain Control Module (PCM).
In the AC1 mode, the A/C system operates like a conventional A/C system controlled by the HVAC. The HVAC activates the following A/C system components:
- Electric A/C compressor through a Local Interconnect Network (LIN) (item 6).
- A/C isolation valve SOV2 through LIN (item 3).
- A/C isolation valve EXV2 through LIN (item 1).
- The front A/C isolation valve is in the open position (item 13). No signal received from the HVAC.
The recovery heat exchanger operates as an A/C condenser and cools the refrigerant vapor. The heat removed by the air changes the state of the refrigerant from a vapor to a liquid.
The A/C orifice tube automatically controls the flow of refrigerant to the evaporator in the climate control assembly. The evaporator also has a temperature sensor connected to the HVAC located close to the evaporator. The temperature sensor is on the air outlet side of the evaporator inside the climate control assembly. If the temperature of the outlet air from the evaporator is less than a specified temperature, the HVAC stops the A/C. This prevents the formation of ice on the evaporator.
Cooling of the Passenger Compartment and the Electric Vehicle Battery: AC2
A = REFRIGERANT FLOW: B = ELECTRIC VEHICLE (EV) BATTERY COOLANT .
| ITEM | DESCRIPTION |
|---|---|
| 1 | Air Conditioning (A/C) isolation valve EXV2 |
| 2 | Recovery heat exchanger |
| 3 | A/C isolation valve SOV2 |
| 4 | A/C temperature pressure sensor - Compressor outlet |
| 5 | A/C silencer |
| 6 | Electric A/C compressor |
| 7 | A/C temperature pressure sensor - Compressor inlet |
| 8 | A/C accumulator |
| 9 | A/C service connection High Pressure (HP) |
| 10 | A/C check valve |
| 11 | Evaporator in the climate control assembly |
| 12 | A/C orifice tube |
| 13 | Front A/C isolation valve |
| 14 | A/C service connection Low Pressure (LP) |
| 15 | Electric Vehicle (EV) battery cooler |
| 16 | A/C check valve |
| 17 | EV battery |
| 18 | EV battery coolant pump |
The Air Conditioning (A/C) mode of operation AC2, normally only operates if the Ambient Air Temperature (AAT) is more than 0°C. The HVAC control module receives the AAT sensor data through the High Speed (HS) Controller Area Network (CAN) power mode zero from the Powertrain Control Module (PCM).
In the AC2 mode, the A/C system cools the passenger compartment and the Electric Vehicle (EV) battery temperature control system controlled by the HVAC. The EV battery temperature control system cools the EV battery. The HVAC activates the following A/C system components:
- Electric A/C compressor through a Local Interconnect Network (LIN) (item 6).
- EV battery cooler isolation valve through a hardwired signal (item 15).
- A/C isolation valve SOV2 through LIN (item 3).
- A/C isolation valve EXV2 through LIN (item 1).
- The front A/C isolation valve is in the open position (item 13). No signal received from the HVAC.
The recovery heat exchanger is the A/C system condenser and cools the refrigerant vapor. Cooling the refrigerant vapor allows the change of state to a liquid by removing heat from the refrigerant to the air.
For the passenger compartment, the A/C orifice tube automatically regulates the flow of refrigerant to the evaporator in the climate control assembly. The evaporator also has a temperature sensor located close to it in climate control assembly connected to the HVAC. The temperature sensor is on the air outlet side of the evaporator inside the climate control assembly. If the temperature of the outlet air from the evaporator is less than a specified temperature, the HVAC stops the A/C. This prevents the formation of ice on the evaporator.
For the EV battery temperature control system, the EV battery cooler is an evaporator to cool the EV battery coolant and therefore cool the EV battery. The flow of refrigerant to the EV battery cooler is controlled by the EV battery isolation valve. When the isolation valve is activated the refrigerant flow through the EV battery cooler is controlled by the Thermostatic Expansion Valve (TXV). The refrigerant change of state from a liquid to a vapor requires heat that the EV battery coolant provides. The EV battery cooler cools the EV battery coolant which is circulated through the EV battery to cool it.
For additional information, Refer to: ELECTRIC VEHICLE BATTERY TEMPERATURE CONTROL .
Cooling of the Electric Vehicle Battery when Charging: AC5
A = REFRIGERANT: B = ELECTRIC VEHICLE (EV) BATTERY COOLANT .
| ITEM | DESCRIPTION |
|---|---|
| 1 | Air Conditioning (A/C) isolation valve EXV2 |
| 2 | Recovery heat exchanger |
| 3 | A/C isolation valve SOV2 |
| 4 | A/C temperature pressure sensor - Compressor outlet |
| 5 | A/C silencer |
| 6 | Electric A/C compressor |
| 7 | A/C temperature pressure sensor - Compressor inlet |
| 8 | A/C accumulator |
| 9 | Service A/C connection High Pressure (HP) |
| 10 | Front A/C isolation valve |
| 11 | A/C service connection Low Pressure (LP) |
| 12 | Electric Vehicle (EV) battery cooler |
| 13 | A/C check valve |
| 14 | EV battery |
| 15 | EV battery coolant pump |
The AC5 mode of operation is only used when charging the Electric Vehicle (EV) battery when connected to an external power supply, to cool the EV battery.
In the AC5 mode, the Air Conditioning (A/C) system operates to cool the EV battery using the refrigerant controlled by the HVAC control module. The HVAC activates the following A/C system components:
- Electric A/C compressor through a Local Interconnect Network (LIN) (item 6).
- Front A/C isolation valve through a hardwired signal (item 10). The valve closes to stop the flow of refrigerant through the evaporator in the climate control assembly.
- A/C isolation valve SOV2 through LIN (item 3).
- A/C isolation valve EXV2 through LIN (item 1).
- EV battery cooler isolation valve through a hardwired signal (item 12).
The recovery heat exchanger operates as an A/C condenser and cools the refrigerant vapor. The heat removed by the air changes the state of the refrigerant from a vapour to a liquid.
For the EV battery temperature control system, the EV battery cooler is an evaporator to cool the EV battery coolant and therefore cool the EV battery. The EV battery cooler incorporates the EV battery isolation valve and a Thermostatic Expansion Valve (TXV). When EV battery isolation valve is activated the refrigerant flows to the EV battery cooler. The TXV control the quantity of refrigerant that flow through the EV battery cooler. The refrigerant change of state from a liquid to a vapor requires heat that the EV battery coolant provides. The EV battery cooler cools the EV battery coolant that circulates through the EV battery to cool EV battery.
For additional information, Refer to: ELECTRIC VEHICLE BATTERY TEMPERATURE CONTROL .
Heating for the Passenger Compartment, with Heat from the Electric Drive Temperature Control System: HP1
A = REFRIGERANT: C = ELECTRIC DRIVE COOLANT: D = CLIMATE CONTROL COOLANT .
| ITEM | DESCRIPTION |
|---|---|
| 1 | Electric drive cooler |
| 2 | Air Conditioning (A/C) temperature pressure sensor - Electric drive cooler |
| 3 | A/C check valve |
| 4 | A/C accumulator |
| 5 | A/C temperature pressure sensor - Compressor inlet |
| 6 | Electric A/C compressor |
| 7 | A/C silencer |
| 8 | A/C temperature pressure sensor - Compressor outlet |
| 9 | A/C isolation valve SOV1 |
| 10 | Climate control indirect condenser |
| 11 | A/C isolation valve SOV4 |
| 12 | A/C service connection Low Pressure (LP) |
| 13 | Front A/C isolation valve |
| 14 | A/C service connection High Pressure (HP) |
| 15 | Climate control coolant pump |
| 16 | Heater core |
| 17 | High Voltage (HV) interior heater |
| 18 | Electric drive temperature control system |
| 19 | Electric drive coolant pump |
The Air Conditioning (A/C) mode of operation HP1, normally only operates if the Ambient Air Temperature (AAT) is less than 15°C. The HVAC control module receives the AAT sensor data through the High Speed (HS) Controller Area Network (CAN) power mode zero from the Powertrain Control Module (PCM).
In the HP1 mode, the A/C system operates to provide heat for the passenger compartment using the heat from the electric drive temperature control system. The A/C system uses the refrigerant for the heat transfer controlled by the HVAC. The HVAC activates the following A/C system components:
- Electric A/C compressor through a Local Interconnect Network (LIN) (item 6).
- Front A/C isolation valve through a hardwired signal (item 13). The valve closes to stop the flow of refrigerant through the evaporator in the climate control assembly.
- A/C isolation valve SOV1 through LIN (item 9).
- A/C isolation valve SOV4 through LIN (item 11).
- Electric drive cooler isolation valve through LIN (item 1)
The PCM controls the electric drive temperature control system. When the vehicle is driven, the heat from the electric drive components is available to provide heat for the passenger compartment.
The heat from the electric drive temperature control system in the electric drive coolant is transferred to the refrigerant in the electric drive cooler. The refrigerant changes state from the liquid to a vapor. This cools the electric drive coolant to cool the electric drive temperature control system. The heat in the refrigerant is then circulated to the climate control indirect condenser.
For additional information, Refer to: ELECTRIC DRIVE TEMPERATURE CONTROL .
The climate control indirect condenser moves the heat from the refrigerant to the climate control coolant to heat the passenger compartment. The climate control indirect condenser removes the heat from the refrigerant by the change of state of the refrigerant from a vapor to a liquid. The heat from the refrigerant change of state, transfers to the climate control coolant.
The HVAC activates the climate control coolant pump to circulate the climate control coolant through the climate control indirect condenser. In the climate control indirect condenser the climate control coolant is heated by the heat provided by the refrigerant. The heated climate control coolant is circulated to the heater core in the climate control assembly. The heater core transfers the heat from the climate control coolant to the passenger compartment air to heat the passenger compartment.
For additional information, refer to: HEATING AND VENTILATION .
Heating for the Passenger Compartment, with Heat from the Outside Air: HP2
A = REFRIGERANT: D = CLIMATE CONTROL COOLANT .
| ITEM | DESCRIPTION |
|---|---|
| 1 | Air Conditioning (A/C) isolation valve EXV2 |
| 2 | Recovery heat exchanger |
| 3 | A/C isolation valve SOV5 |
| 4 | A/C temperature pressure sensor - Recovery heat exchanger outlet |
| 5 | A/C accumulator |
| 6 | A/C temperature pressure sensor - Compressor inlet |
| 7 | Electric A/C compressor |
| 8 | A/C silencer |
| 9 | A/C temperature pressure sensor - Compressor outlet |
| 10 | A/C isolation valve SOV1 |
| 11 | Climate control indirect condenser |
| 12 | A/C isolation valve SOV4 |
| 13 | A/C service connection Low Pressure (LP) |
| 14 | Front A/C isolation valve |
| 15 | A/C service connection High Pressure (HP) |
| 16 | Climate control coolant pump |
| 17 | Heater core |
| 18 | High Voltage (HV) interior heater |
The Air Conditioning (A/C) mode of operation HP2, normally only operates if the Ambient Air Temperature (AAT) is less than 3°C. The HVAC control module receives the AAT sensor data through the High Speed (HS) Controller Area Network (CAN) power mode zero from the Powertrain Control Module (PCM).
In the HP2 mode, the A/C system operates to provide heat for the passenger compartment by using heat in the outside air. The refrigerant is used for the heat transfer controlled by the HVAC. The HVAC activates the following A/C system components:
- Electric A/C compressor through a Local Interconnect Network (LIN) (item 7).
- Front A/C isolation valve through a hardwired signal (item 14). The valve closes to stop the flow of refrigerant through the evaporator in the climate control assembly.
- A/C isolation valve SOV1 through LIN (item 10).
- A/C isolation valve SOV4 through LIN (item 12).
- A/C isolation valve EXV2 through LIN (item 1).
The recovery heat exchanger operates as an evaporator to take heat from the outside air and heat the refrigerant liquid. The heat from the outside air allow the refrigerant change of state to a vapor by moving heat from the air to the refrigerant.
The climate control indirect condenser moves the heat from the refrigerant to the climate control coolant to the heat the passenger compartment. The climate control indirect condenser removes the heat from the refrigerant by the change of state of the refrigerant from a vapor to a liquid. The heat from the refrigerant change of state, transfers to the climate control coolant.
The HVAC activates the climate control coolant pump to circulate the climate control coolant through the climate control indirect condenser. In the climate control indirect condenser the climate control coolant is heated by the heat provided by the refrigerant. The heated climate control coolant is circulated to the heater core in the climate control assembly. The heater core transfers the heat from the climate control coolant to the passenger compartment air to heat the passenger compartment.
For additional information, refer to: HEATING AND VENTILATION .
Heating for the Passenger Compartment, Heat from the Electric Drive Temperature Control System and the Outside Air: HP3
A = REFRIGERANT: C = ELECTRIC DRIVE COOLANT: D = CLIMATE CONTROL COOLANT .
| ITEM | DESCRIPTION |
|---|---|
| 1 | Air Conditioning (A/C) isolation valve EXV2 |
| 2 | Recovery heat exchanger |
| 3 | A/C isolation valve SOV5 |
| 4 | A/C temperature pressure sensor - Recovery heat exchanger outlet |
| 5 | A/C accumulator |
| 6 | A/C temperature pressure sensor - Compressor inlet |
| 7 | Electric A/C compressor |
| 8 | A/C silencer |
| 9 | A/C temperature pressure sensor - Compressor outlet |
| 10 | A/C isolation valve SOV1 |
| 11 | Climate control indirect condenser |
| 12 | A/C isolation valve SOV4 |
| 13 | A/C service connection Low Pressure (LP) |
| 14 | Front A/C isolation valve |
| 15 | A/C service connection High Pressure (HP) |
| 16 | Electric drive cooler |
| 17 | A/C temperature pressure sensor - Electric drive cooler |
| 18 | A/C check valve |
| 19 | Climate control coolant pump |
| 20 | Heater core |
| 21 | High Voltage (HV) interior heater |
| 22 | Electric drive temperature control system |
| 23 | Electric drive coolant pump |
The Air Conditioning (A/C) mode of operation HP3, normally only operates if the Ambient Air Temperature (AAT) is less than 3°C. The HVAC control module control module receives the AAT sensor data through the High Speed (HS) Controller Area Network (CAN) power mode zero from the Powertrain Control Module (PCM).
In the HP3 mode, the A/C system operates to provide heat for the passenger compartment using heat from:
- The electric drive temperature control system.
- The outside air.
The A/C system uses the refrigerant for the heat transfer controlled by the HVAC. The HVAC activates the following A/C system components:
- Electric A/C compressor through a Local Interconnect Network (LIN) (item 7).
- Front A/C isolation valve through a hardwired signal (item 14). The valve closes to stop the flow of refrigerant through the evaporator in the climate control assembly.
- A/C isolation valve SOV1 through LIN (item 10).
- A/C isolation valve SOV4 through LIN (item 12).
- A/C isolation valve EXV2 through LIN (item 1).
- Electric drive cooler isolation valve through LIN (item 16).
The A/C isolation valve EXV2 controls the flow of refrigerant through the recovery heat exchanger controlled by the HVAC. The HVAC monitors the heat recovered from the outside air by the recovery heat exchanger. The HVAC uses the A/C temperature pressure sensor - recovery heat exchanger to monitor the heat recovered.
The PCM controls the electric drive temperature control system. When the vehicle is driven, the heat from the electric drive components is available to provide heat for the passenger compartment. The PCM communicates the heat available to the HVAC.
The HVAC controls the electric drive cooler isolation valve to control the flow of refrigerant through the electric drive cooler. The HVAC monitors the heat recovered by the electric drive cooler from the electric drive temperature control system. The HVAC uses data from the A/C temperature pressure sensor - electric drive cooler to monitor the heat recovered.
The heat from the electric drive temperature control system in the electric drive coolant is transferred to the refrigerant in the electric drive cooler. The refrigerant changes state from the liquid to a vapor. This cools the electric drive coolant to cool the electric drive temperature control system. The heat in the refrigerant then circulated to the climate control indirect condenser.
For additional information, Refer to: ELECTRIC DRIVE TEMPERATURE CONTROL .
The HVAC balances the heat in the refrigerant from the 2 sources dependant upon demand to heat the passenger compartment.
The climate control indirect condenser moves the heat from the refrigerant to the climate control coolant to the heat the passenger compartment. The climate control indirect condenser removes the heat from the refrigerant by the change of state of the refrigerant from a vapor to a liquid. The heat from the refrigerant change of state, transfers to the climate control coolant.
The HVAC activates the climate control coolant pump to circulate the climate control coolant through the climate control indirect condenser. In the climate control indirect condenser the climate control coolant is heated by the heat provided by the refrigerant. The heated climate control coolant is circulated to the heater core in the climate control assembly. The heater core transfers the heat from the climate control coolant to the passenger compartment air to heat the passenger compartment.
For additional information, refer to: HEATING AND VENTILATION .
Operation of the Air Conditioning in the Passenger Compartment and Heat the Passenger Compartment with Heat from the Electric Drive Temperature Control System: RH2
A = REFRIGERANT: C = ELECTRIC DRIVE COOLANT: D = CLIMATE CONTROL COOLANT .
| ITEM | DESCRIPTION |
|---|---|
| 1 | Electric drive cooler |
| 2 | Air Conditioning (A/C) temperature pressure sensor - Electric drive cooler |
| 3 | A/C check valve |
| 4 | A/C accumulator |
| 5 | A/C temperature pressure sensor - Compressor inlet |
| 6 | Electric A/C compressor |
| 7 | A/C silencer |
| 8 | A/C temperature pressure sensor - Compressor outlet |
| 9 | A/C isolation valve SOV1 |
| 10 | Climate control indirect condenser |
| 11 | A/C isolation valve SOV4 |
| 12 | A/C service connection Low Pressure (LP) |
| 13 | Front A/C isolation valve |
| 14 | A/C orifice tube |
| 15 | Evaporator in the climate control assembly |
| 16 | A/C check valve |
| 17 | A/C service connection High Pressure (HP) |
| 18 | High Voltage (HV) interior heater |
| 19 | Heater core |
| 20 | Climate control coolant pump |
| 21 | Electric drive temperature control system |
| 22 | Electric drive coolant pump |
The Air Conditioning (A/C) mode of operation RH2, normally only operates if the Ambient Air Temperature (AAT) is more than 0°C. The HVAC control module receives the AAT sensor data through the High Speed (HS) Controller Area Network (CAN) power mode zero from the Powertrain Control Module (PCM).
In the RH2 mode, the A/C system operates the evaporator in the climate control assembly for the passenger compartment and provides heat for the passenger compartment. The heat recovered from the electric drive temperature control system using the refrigerant for the heat transfer is controlled by the HVAC. The HVAC activates the following A/C system components:
- Electric A/C compressor through a Local Interconnect Network (LIN) (item 6).
- The front A/C isolation valve is in the open position (item 13). No signal from the HVAC.
- A/C isolation valve SOV1 through LIN (item 9).
- A/C isolation valve SOV4 through LIN (item 11).
- Electric drive cooler isolation valve through LIN (item 1).
The A/C orifice tube automatically controls the flow of refrigerant to the evaporator in the climate control assembly. The evaporator also has a temperature sensor connected to the HVAC located close to the evaporator. The temperature sensor is on the air outlet side of the evaporator inside the climate control assembly. If the temperature of the outlet air from the evaporator is less than a specified temperature, the HVAC stops the A/C. This prevents the formation of ice on the evaporator.
The PCM controls the electric drive temperature control system. When the vehicle is driven, the heat from the electric drive components is available to provide heat for the passenger compartment. The PCM communicates the heat available to the HVAC.
The HVAC controls the electric drive cooler isolation valve to control the flow of refrigerant through the electric drive cooler. The HVAC monitors the heat recovered by the electric drive cooler from the electric drive temperature control system. The HVAC uses data from the A/C temperature pressure sensor - electric drive cooler to monitor the heat recovered.
The heat from the electric drive temperature control system in the electric drive coolant is transferred to the refrigerant in the electric drive cooler. The refrigerant changes state from the liquid to a vapor. This cools the electric drive coolant to cool the electric drive temperature control system. The heat in the refrigerant then circulated to the climate control indirect condenser.
For additional information, Refer to: ELECTRIC DRIVE TEMPERATURE CONTROL .
The HVAC balances the heat in the refrigerant from the 2 sources dependant upon demand to heat the passenger compartment.
The climate control indirect condenser moves the heat from the refrigerant to the climate control coolant to the heat the passenger compartment. The climate control indirect condenser removes the heat from the refrigerant by the change of state of the refrigerant from a vapor to a liquid. The heat from the refrigerant change of state, transfers to the climate control coolant.
The HVAC activates the climate control coolant pump to circulate the climate control coolant through the climate control indirect condenser. In the climate control indirect condenser the climate control coolant is heated by the heat provided by the refrigerant. The heated climate control coolant is circulated to the heater core in the climate control assembly. The heater core transfers the heat from the climate control coolant to the passenger compartment air to heat the passenger compartment.
For additional information, refer to: HEATING AND VENTILATION .
Refrigerant System Lubrication
The electric Air Conditioning (A/C) compressor operates at low speed to move the refrigerant around the A/C system and lubricate the A/C system between modes of operation. This enables the A/C system to respond quicker to A/C system demands. This can occur when the vehicle is connected to an external power supply to charge the Electric Vehicle (EV) battery.
De-icing
The recovery heat exchanger when operating as an evaporator can have condensation or ice on it. When the vehicle is connected to an external power supply to charge the Electric Vehicle (EV) battery and it is necessary to cool the EV battery. The recovery heat exchanger then operates as a condenser and can result in water vapor coming off the recovery heat exchanger. This is normal operation for the recovery heat exchanger.