W
EBASTO
S
CHOLASTIC
S
ERIES
2GENERAL DESCRIPTION
2-1
1 Electronic control unit
2 Motor
3 Electronic ignition coil
4 Coupler
5 Combustion air fan
6 Solenoid valve
7 Electrode holder
8 Outlet water pipe - 25 mm (1 in. OD.)
9 Inlet water pipe - 25 mm (1 in. OD.)
The Webasto Scholastic Series Heater has been designed for use on diesel powered school buses. Equipped with
1-inch coolant line connections, heavy-duty coolant pump, single fuel line and additional safety features makes this
an ideal choice for school bus applications.
Webasto Scholastic Series Heaters are designed to:
1. Preheat Engine block of liquid cooled engines to ensure reliable starting in cold weather and to reduce cold start
wear and emissions (white smoke).
2. Boost heating levels with the engine running. The heater will boost the heating system in cold weather when an
engine is running at light loads, even at high speeds or idling. The heat rejection of modern diesel engines to the
coolant, especially in school buses, is often not adequate to heat the vehicle’s interior.
3. Increase Safety by providing higher levels of heat for quick defrosting of windshield and side glass for greatly
improved visibility.
2. General Description
2.1 Scholastic Heater Description
Fig. 2-1: Webasto Scholastic Series Heater
10 Ignition electrodes
11 Fuel nozzle
12 Overheat fuse
13 Control thermostat
14 Overheat limiter
15 Heat exchanger
16 Exhaust pipe
17 Combustion air swirler
18 Combustion tube
19 Flame detection photocell
20 Fuel pump (single line, no return)
21 Fuel connection pipe (JIC #4)
22 Combustion air intake
23 Reduction gearing
24 Nozzle preheat cartridge
25 Preheat thermostat
26 Bleed screw
