2.  
AIR SOURCE HEAT/START switch -As required. ENG if engine is operating; OFF for heat from external air source.

3.  
HEATER ON-OFF switch -ON.

4.  
VENT BLOWER switch -OFF for maximum heat.

5.  
HEATER control -As desired.

2.55 VENTILATION SYSTEM.
2.55.1 Ventilation System. The helicopter is ventilated by an electrically-operated blower system controlled through the VENT BLOWER control panel on the upper console (Figure 2-6). The VENT BLOWER switch is marked OFF and ON. When ON, the blower forces ambi-ent air into the cabin ducts. The No. 2 ac primary bus powers the blower through a circuit breaker, marked HEAT & VENT. It is also controlled by dc power from the No. 2 dc primary bus through the VENT BLOWER switch pro-tected by a circuit breaker, marked HEAT VENT. Ram air vents for cooling the cockpit area are on each side of the upper console and at the front of the lower console (Figure 2-4) and are controlled by turning the nozzle to control the opening.
2.55.2 Normal Operation.
1.
APU, rotor or external power -Operating.

2.  
VENT BLOWER switch -ON.

2.56 Air Conditioner System.

ECS operations involving the use of the heat mode: do not remove main power from the ECS without .rst turning the ECS switch to OFF and waiting 60 sec-onds. Failure to do so may result in an extreme over temperature condition of the heater element surface.

AB0701
SA
NOTE
ECS air conditioning requires that the rotor head be turning to facilitate use due to being bussed on the main generators. Either main generator or ground power unit must be con-nected to the aircraft for operation.
All ECS EMC data is currently not avail-able. Operation of the ECS causes an approximate one percent loss in aircraft maximum power available. Additionally, there are ECS design concerns. Use of the ECS may cause an inadvertent power-on reset command to the SAS/FPS computer, illuminating the FPS and TRIM cautions on the MFD and the CPTR failure advisory on the AFCS control panel.

The environmental control system (ECS) heats, venti-lates, and cools the cabin and cockpit areas. Its main com-ponents are an evaporator pallet and condenser pallet located over the main fuel tanks, and an electrical pallet mounted on the bulkhead behind the right main fuel tank. Ducting directs air to the cabin and cockpit. The cooling subsystem is a vapor cycle system, whose compressor is electrically powered. Electrical resistance heating elements in the evaporator pallet heat the air, when required. A single speed fans draws air from the cabin through a .lter, heats or cools the air in the evaporator pallet, and returns the air to the cabin or cockpit through the ducts. Power to operate the air conditioner system is provided from the No. 1 ac primary bus through a circuit breaker marked ECS/HEAT POWER and controlled from the No. 1 dc primary bus through a circuit breaker marked ECS CONTR on the aux-iliary circuit breaker panel. Power is removed from the environmental control system when the rescue hoist power switch is in the ON position.
2.56.1 Controls Control of the ECS system is through the ECS control panel in the cabin (Figure 2-16). Functions of controls are as follows:
CONTROL  FUNCTION
Mode switch  Changes temperature of heated or cooled air.
AC Selects air conditioning mode.
OFF Removes power from ECS system.

CONTROL  FUNCTION
VENT Selects ventilation mode.
HEAT Selects heating mode.
COOLER -Changes temperature of condi-WARMER knob tioned air.
AC ON  Air conditioning mode has been se-lected.
HEAT ON  Heat mode has been selected.
2.56.2 Modes of Operation.
a.
In the heating mode, air is circulated through the evaporator pallet where it is heated by the resistance heater, and directed to the cabin through ducts.
　
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