freightliner PX113064S T 2016 Manual page 115

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1. Front-Box Area
2. Mid-Frame Area
3. Rear Area
4. Inverters
Surge Tank: The surge tank provides storage space
for reserve coolant, expansion space for heated
coolant, and de-aeration space. When coolant in the
radiator runs low, reserve coolant stored in the surge
tank flows from the tank, through the fill hose, to the
water pump.
Electric Coolant Pump: An electric coolant pump is
powered by the low-voltage system. It pressurizes
the coolant to ensure the coolant circulates in the
cooling system.
Positive Temperature Coefficient (PTC): The PTC
heaters provide efficiency and safety to the electric
vehicle heating system. This heater uses a PTC
semiconductor as the heating element. The PTC
semiconductor drastically increases its electrical
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4
5
5. Charge Fuse
6. Direct Current (DC) Boxes
7. High-Voltage Batteries
Fig. 9.1, eCascadia Electric Vehicle Components Overview
Electrical System
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9
8
6 7
8. Charge Port(s)
9. eCarriers
10 eAxles
resistance at temperatures above a certain level and
is able to maintain a constant heating element
temperature during load and supply voltage changes.
For this reason, the risk of the heating element's
overheating or catching fire is minimal, even under
unexpected boil-dry conditions due to the loss of hot
water. Moreover, the heat generation capacity is
nearly constant over a wide range of battery voltage
fluctuations.
Chiller: The chiller transfers the thermal energy from
the battery coolant loop to the vehicle's refrigerant
loop to maintain optimum battery temperatures. The
chiller has an electronic expansion valve that
regulates the refrigerant flow into the chiller.
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9.2