Initial And Repeat Operating Conditions Of Ffh; Ffh Operations According To The Changes Of Coolant Temperature - SSANGYONG 2004 Rexton 2.7XDi Workshop Manual

10A-8
FFH Operating Process
FFH (Fuel Fired Heater) is operated according to the ambient temperature and coolant temperature.

Initial and Repeat Operating Conditions of FFH

Initial Operating Conditions of FFH:
Ambient temperature: below 5°C
Coolant temperature: below 75°C
Repeat Operating Conditions of FFH:
Coolant temperature: below 75°C
When the difference between the ambient temperature at initial operation and current ambient temperature is
over 3°C (to reduce the hysteresis with the temperature difference when operating FFH), FFH is operated
again. For example, if the initial operating temperature was 4°C, the ambient temperature at repeat operation
should be below 1°C and the coolant temperature should be below 75°C.

FFH Operations According to the Changes of Coolant Temperature

Above graph shows the FFH control process while the FFH is operating.
The control element is coolant as shown in the graph.
The FFH is operated in HI mode (high output: approx. 5000 W) until the coolant temperature reaches at 80°C and starts
to be operated in LO mode (low output: approx. 2300 W) from 81°C.
When the coolant temperature reaches at approx. 85°C, FFH stops its operation until the operating conditions will be
met again.
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
Y220_10A004
FFH/PTC SYSTEM
REXTON SM - 2004.4