HEXA

HVAC

Mode control during Manual operation

The Mode control shall switch to the Manual mode

immediately after the user presses the mode button.

In the Manual mode, the driver shall select the mode

by pressing the mode pushbutton on the control

head. The mode shall switch in a cyclic sequence as

shown above for each press of the button. The dis-

play shall be updated as shown above

corresponding to the current selected mode.

7. Economy A/C request

Using the non-latching Econ A/C button, the user

shall be able to choose between Economy A/C and

A/C off state. The A/C Economy Request pushbutton

allows the user to manually request that the com-

pressor operate in an energy-saving mode. This is

achieved by maintaining the Evaporator at a higher

target temperature.



ROTARY KNOBS

1. Blower speed selection

The Fan Speed selector knob is an encoder that al-

lows the user to select 7 different blower speeds. By

reducing the blower speed to zero, it allows the user

to turn the system off.

The Blower control shall be functional at all times

when control head receives ignition voltage. Blower

control shall indicate the control of the quantity of air

flow, which is accomplished by controlling the speed

of the blower fan. The Blower control shall happen

either manually or through an automatic climate con-

trol algorithm.

Blower speed control during Auto operation

The Blower control shall switch to Auto operation

immediately after the user presses the Auto button.

The desired blower speed shall be determined by the

climate control algorithm during Auto operation.

The display of the blower speed icon shall remain

blank and not indicate the current blower speed dur-

ing Auto operation.

Blower speed control during Manual operation

The Blower speed control shall switch to the Manual

operation immediately after the user turns the blower

knob. In the Manual operation, the driver shall select

the blower by rotating the blower knob on the control

head. It shall be possible for the user to select from 7

different blower speed levels (

excluding OFF

). The

blower speed shall increase by one level for a rota-

tion through a calibratible no. of detents in the

clockwise-direction direction. Similarly, the blower

speed shall decrease by one level for a rotation

through a calibratible no. of detents in the counter

clockwise direction. The blower shall switch off if the

user attempts to reduce the blower speed below

Level 1.