Proheat X45–School Bus - Manual (Page 30)

Figure 3-16 Engine and Sleeper Heat
Figure 3-15 Engine and Sleeper Heat
SECTION 3. INSTALLATION
OPTION B – Engine and Sleeper Heat
For vehicles with solenoid valves
in the normally closed position.
Western Star
For best results these vehicles
should use an auxiliary heater.
International with single heater
NOTE: Vehicles equipped with a combination heater/air-conditioner will have
a solenoid operated shut-off valve in the heater unit. Typically this valve
is normally open with the truck engine turned off and the key removed.
(See Figure 3-16 for plumbing)
Due to the many options available in vehicle heating and air
conditioning systems, the installer should be looking for any
restrictions that may affect coolant flow, with vehicle ignition in the
“OFF” position.
DASH HEATER
ENGINE SUPPLY TO PROHEAT
RETURN TO ENGINE
OEM OR AUXILIARY
SLEEPER HEATER
SOLENOID VALVE
OEM COMBO HEATERS
ONLY (NORMALLY OPEN)
DASH HEATER
SUPPLY TO PROHEAT
RETURN TO ENGINE
SLEEPER HEATER
SOLENOID VALVE
(NORMALLY CLOSED)
ENGINE
NOTICE
The PROHEAT PCM sleeper fan circuit
has a one minute delay during ignition.
Power to open a sleeper fan coolant
valve must be taken from another
source such as the wire for the hour
meter (auxiliary output). (See PROHEAT
Wiring Diagram on page 1-4.)
3-9
3.4.3