ZENAIR CH2000 SERVICE MANUAL
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SECTION XI
CABIN HEATER AND VENTILATION SYSTEM
GENERAL - Fig. 25
Heat for the cabin of the CH2000 is provided by an air heater installed on the exhaust
manifold. Fresh air enters the engine compartment through the nose cowling and is vented
to the heater muff through a flexible hose located on the baffling at the front of the engine.
The air is then heated and vented into the cabin area through a valve which can be
controlled from the instrument panel. When the valve is completely closed off, the heated
air is vented back into the engine compartment. The heater outlet in the cabin is located in
front of the pilot’s feet. The windshield is kept clear of frost, by a defroster system which
operates from the heater.
Fresh air is supplied to the cabin by adjustable vents in the right and left door windows.
HEATER MAINTENANCE
1.
Disconnect the hoses of the cabin heat shroud.
2.
Remove the heat shroud and inspect the outer surface of the inner core (exhaust pipe)
for signs of combustion products.
3.
Thoroughly clean the exhaust pipe of all dirt and corrosion.
4.
Carefully inspect the exhaust pipe, using a hand-held magnifying glass and light /
mirror, for signs of cracks and pinholes. Pay particular attention to welds, seams, and
their adjacent areas.
5.
Any suspect areas are to be further evaluated by a pressure test or other means.
6.
Repair or replace, before further flight, exhaust pipe containing cracks or holes.
REINSTALL the heat shroud and hoses in reverse order of removal.
CABIN HEAT CONTROL
Check the operation of the push-pull control to insure the valve door functions properly:
when the control is pulled out, the door should be completely open to permit full air flow;
when the control is pushed in, the valves should close off all air passage.
HOT WEATHER USE
The slat hose from the engine baffle to muffler heat shroud to cabin can be replaced with a
one piece scat hose from engine baffle to cabin. This will give additional fresh air in cabin
area.
Nov-02
11.1
