SSANGYONG RODIUS 2004.09 Manual page 130

0-86 6810-21
3) CIRCUIT DESCRIPTION
(1) PTC (POSITIVE TEMPERATURE COEFFICIENT) SYSTEM
The supplementary electrical heater is installed in DSL engine equipped vehicle as a basic
equipment.
The PTC system is operated according to two temperature values measured at the coolant
temperature sensor and HFM sensor.
This device is mounted in the heater air outlet and increase the temperature of air to the
passenger room. Because PTC system is heated by electrical power, high capacity alternator
is required. (Alternator of 12 V 75 A/90 A has changed to 12 V 140A)
(2) PTC OPERATING (ON) CONDITION
The operating condition of PTC is controlled by two step. Generally, ECU control the power
relay for PTC depending on the coolant temperature and ambient temperature sensor.
1st step (Initial PTC operating condition)
▶
- When coolant temperature < 15°C, PTC is operating (ON).
- When coolant temperature ≥ 15°C, tow conditions decribed below must be
satisfied.
▶ 2nd step (Coolant temperature: 15°C)
- When coolant temperature 65°C ≤ and ambient temperature ≤ 10°C PTC operates
- (ON)
When coolant temperature 65 ~ 60°C
- operates (ON)
When coolant temperature ≤ 60°C and ambient temperature ≤ 0°C ~ 5°C, PTC
operates (ON)
▶ PTC "OFF" CONDITION
- Airconditioner blower switch OFF
- Ambient temperature sensor error (wiring short or open)
- When engine craking
- Battery voltage is lower than 11V
-
When preheating the engine (Glow indicator "ON")
CIRCUIT
RODIUS 2004.09
and ambient temperature -10°C ~ 0°C PTC