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PLUMB THE APU TO THE MAIN ENGINE
Step Four
Page4
Note: This APU Systems comes with a built in radiator. The connection below is optional.
Plumbing Procedure
1. Remove the truck radiator cap to free pressure from coolant system. Do not open when hot.
2. Deplete the truck coolant system (if necessary).
3. The APU is shipped with extensive life anti-freeze. Ensure this is compatible with truck coolant.
4. Ensure that the coolant will flow in the right direction (same direction whether the Diamond or main engine is running). The Diamond flow indicator
can be used to verify the flow.
5. Replenish the engine coolant in the system according to the specific engine manufacturer’s recommendations (additional coolant will be required).
Plumbing Considerations
• Silicon hose is satisfactory to use as coolant hose, but requires the use of silicon hose clamps.
• Ensure radiator coolant can always flow between truck engine and APU.
Low Pressure
Port (Suction)
Install ShutOff Valves
High Pressure
Port
No Sharp Bends
3/4” ID Hose
Loom All
Hoses
3/4” Fitting Return From APU
Choose Ports That Are Far
Apart For Max Crossflow
1/2” Or Larger
NPT Fittings
Truck EngineBack View Of APU
3/4” Fitting
Supply To APU
Use A Flow Indicator To Comfirm
Flow Direction And Speed
WARNING: To avoid serious injury, permit the engine to cool before opening the radiator cap.
CAUTION: Plumbing through the dash or sleeper heater will null and void your warranty.
CAUTION: Take care not to spill coolant.