User manual

52 53
52 53
The air conditioning system can be operated either independently or
in conjunction with the heater, depending upon the mode selected
on the cabin comfort control panel. During normal operation, when
the MODE switch (3) is in the AUTO position, a thermostat, adjustable
by the TEMP knob (5), signals an electronic controller which turns on
the air conditioner until the cabin reaches the selected temperature.
When the MODE switch (3) is in MANUAL position, the air conditioner
may be turned on or off, as desired, by use of the MANUAL switch (6).
The air conditioner is on when the MANUAL switch (6) is in the A/C
position, and off when the switch is in the heater HTR position. For
manual operation of the air conditioner, the HEATER FUEL switch (2)
must be off.
Environmental Control System (ECS) - Cheyenne IIXL
1: ECS Bypass switch 7: Windshield Wiper selector
2: ECS Mode switch 8: Cabin Air Control lever
3: ECS Hi/Low Bleed selector 9: Windshield Defog switch
4: Cabin Temperature Rheostat selector knob 10: Fuel totalizer
5: Manual Temperature control switch 11: Yoke clickspot
6: Cabin Fan switch
The environmental control system (ECS) in the Cheyenne IIXL is an
electronic control system for automatic temperature control with provi-
sion for manual electrical control to offset failures. A ram-air ventila-
tion system is provided for unpressurized flight or if failures occur in
the air-conditioning system. Normal air source during pressurized flight