Blue Bird D3RE 2014 - Standard Heater Cut off Valves

93
ROUTINE OPERATION
ENGINE
DRIVER’S
HEATER
D3RE
FRT. HTR.
1
REAR
HEATER
2
Standard Heater Cut Off Valves
Valves are provided in the heater piping to permit isolation of the heating circuit
from the engine coolant circuit. This is useful in case a leak occurs within the system,
or to restrict the flow of hot water through the bus during warm weather.
When Valves No. 1 and No. 2 in the diagrams below are closed, engine coolant is
prevented from circulating through the heaters. (This does not restrict circulation of
the engine cooling circuit, so it is safe to opeartate the engine with the valves closed.)
[CAUTION] Do not operate auxiliary heater or auxiliary coolant pump with
heater cutoff valves closed
valve no. location
1 at front left side of engine.
(supply)
2 at rear left side of engine.
(return)
Engine: CumminsHeater Circuit