1-11
T -312
1.7 HEATING (ENGINE COOLANT) FLOW CYCLE
Heating circuit components furnished by Carrier
T ransicold include heater cores and evaporator heat
valves (EHV) for the driver and main evaporator
assemblies and a coolant bypass heat valve.
Components furnished by the coach manufacturer
include auxiliary heater and engine water pump,
auxiliary heater, hand valves and “Y” type strainers. The
main controller automatically controls the EHV valves
during heating and reheat cycles to maintain required
temperatures inside the coach. Engine coolant (glycol
solution) is circulated through the heating circuit by the
engine and auxiliary water pumps. When the evaporator
heat valve solenoid is de-energized, the valve will open
to allow engine coolant to flow through the heater coil.
(See Figure 1-11.) The valve is normally open so that if a
failure occurs, the system will still be able to supply heat.
*AUXILIARY
HEATER
*ENGINE
*ENGINE
WATER PUMP
*INDICATES COMPONENTS FURNISHED
BY THE COACH MANUFACTURER
BYPASS HEAT VALVE
*HAND VALVE
*HAND VALVE
*’Y’ STRAINER
HEAT
VALVE
HEAT
VALVE
AIR BLEED
VALVE
AIR BLEED
VALVE
DRAIN VALVE
DRIVER
HEATER
CORE
MAIN
HEATER CORE
Figure 1-11. Heating System Flow Diagram
To Next Page
Loading...
