Proheat X45–School Bus - Manual (Page 24)

Figure 3-5 Height Requirement
SECTION 3. INSTALLATION 3-3
Heater must be mounted below the highest point in the cooling system. An
expansion tank may be added to the coolant system above the heater if this
is not possible.
MOUNTING THE PROHEAT HEATER IN AN ENCLOSURE
Do not locate the heater in an
airtight enclosure. If the heater is to
be mounted in an enclosure other
than the PROHEAT enclosure,
adequate air flow must be provided
to ensure proper combustion. The
enclosure must also be adequately
ventilated so that the ambient
temperature inside the enclosure
does not exceed 185 °F (85 °C).
The openings must be positioned to prevent moisture dirt and snow from
accumulating in the enclosure. The heater enclosure must be easily
accessed for servicing of the heater.
Figure 3-7 Mounting Angle
Heater must be mounted within 5˚ of horizontal, as shown.
HIGHEST POINT IN
COOLING SYSTEM
HEATER MUST
BE MOUNTED
BELOW
HIGHEST POINT
PROHEAT ENGINE OR RADIATOR
5˚
5˚
5˚
5˚
3.1.3
Figure 3-6 Adequate Air Flow