Proheat X45–School Bus - Manual (Page 28)

3-7 SECTION 3. INSTALLATION
GENERAL CONSIDERATIONS
Coolant flow must be maintained throughout the coolant system
under all conditions.
• Keep the engine inlet and outlet ports as far apart as possible to maximize
cross-flow through engine.
• Coolant pump and engine water pump must flow in the same direction.
• Ensure that no sharp kinks or bends exist in the hoses which may restrict
coolant flow.
• Avoid high points in the hose routing to prevent air traps.
• For systems requiring more than 50 feet of coolant line, contact Proheat
Product Support at www.proheat.com for coolant pump recommendations.
For plumbing the system use:
1 ⁄
2
" NPT pipe fittings or bigger.
3 ⁄
4
" ID heater hose.
NOTE: Use of silicone hose requires special hose clamps.
Shut-off valves are not required at the engine inlet and outlet connections but
may be used if desired. They should be left open at all times so that the heater
can be operated throughout the year.
Select Your Plumbing Option
Option A: Engine heat or supplemental heat.
The PROHEAT heats the engine block only.
NOTE: When the engine block is preheated you will have nearly
instant heat from the dash heat exchanger.
Option B: Engine and sleeper heat.
The PROHEAT heats the engine block and the sleeper.
NOTE: Plumbing the PROHEAT through the dash fan is not
recommended.
PLUMBING THE SYSTEM
You Choose
☞
Figure 3-12 Maximum cross-flow
M
AX
IM
UM
CR
OS
S-F
LO
W
3.4
3.4.1