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TK 55676-19-IM-EN
D2/D4 Heater Duct Installation
Duct Locations
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ntt:: See “Discharge and Return Air Duct Standards“ in Section 7 of the Thermo King TriPac Installation
Standards Guide (TK 56498). THESE STANDARDS MUST BE FOLLOWED!
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Y!! Do not use existing vehicle ducts or outlets. Ducts and outlets must
be capable of withstanding a minimum of 300F (148.9C) operating temperatures.
•
Adjustable air vent must always be installed so it cannot blow hot air directly at living creatures (people, animals) or
objects sensitive to temperature.
•
Do not position outlet so that it will blow hot air directly at operator or at thermostat.
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Position air outlet so that it cannot be obstructed.
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Use the supplied protective air intake grille on the air inlet side of the heater to prevent objects from being sucked in.
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Do not overtighten duct clamps.
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Do not lay or bundle the heater ducts with A/C ducts. They should not touch each other.
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Ensure provisions are made for proper air return ventilation.
The heater is equipped with a R
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ett for attaching the flexible heater duct hoses.
N
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ess:: A return air duct to the heater should be provided for best heating efficiency.
•
Return Inlet must be provided to return air to the heater. It is typically mounted at the base of the bunk
directly opposite the discharge outlet vent.
•
Discharge Outlet should be located at floor level to provide maximum heating comfort in the sleeper. It is
typically installed at the base of the bunk on one end.
•
Heater ducts should be installed and routed with smooth bends and no kinks to provide maximum airflow.
Installation Procedures
Special Tools Required
Drill Motor
2-1/2” Hole Saw (for installing discharge air vent and return air grille)
3” Hole Saw (for routing ducts through compartment walls if required)
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1. Find an appropriate location for the floor level discharge air vent and drill a 2-1/2” hole using the correct hole saw.
a. Unsnap rotating outer louver assembly from the mounting base.
b. Install the base into 2-1/2” hole and secure with supplied screws.
c. Reinstall rotating outer louver assembly back into the mounting base ring. Verify that it rotates freely.
2. Attach one end of the heater duct to the discharge outlet hood on the heater and secure with supplied clamp.
3. Route the heater duct to the floor level discharge air vent, cut as needed, attach to the end of the plastic louver vent
and secure with supplied hose clamp.
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4. If a return air duct is not used, the protective grille must be installed onto the heater inlet.
5. Find an appropriate location for the floor level return air grille and drill a 2-1/2” hole using the correct hole saw.
a. Install return air grille into the 2-1/2” hole and secure with supplied screws.
6. Attach one end of return air duct to air inlet hood on heater and secure with supplied clamp.
a. Route return air duct to return air grille, cut as needed, attach to end of plastic louver vent and secure with
supplied hose clamp.
