esteem lover,
went through the whole post. this is what elf said-
Default A/c Compressors...
Here's a pic of a typical simple HVAC (Heating / Ventilation / Air-Conditioning) Console.
THE CONTROLS.
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The blower speed regulator sets the speed of the fan that blows the air into the vehicle cabin.
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The air conditioning button puts the compressor on & off manually.
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The vent selector allows you to select the vents through which the blower will blow the air. The pre-sets are through :
1. the floor vents only;
2. floor & dashboard vents;
3. dashboard vents only;
4. the dashboard & the front windscreen vents;
5. front windscreen vents only.
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The temperature control knob allows you to set the ratio of hot or cold air, or a permutation of both that you want through your cabin.
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The fresh air / recirculated air selector (not labelled above) lets you choose between recirculating the air already in your cabin, or opening a flap (often on your firewall) to let in air from outside your cabin.
HOW IT WORKS after you've been driving for some time.
Firstly, your compressor comes on when both your blower speed is on the first setting & your air conditioning button is on. Without these two in that state, the a/c compressor is off. I guess most of you know this bit.
You can set the volume of air, as well as it's relative temperature & the position from which it blows using the controls above. You also have a choice of fresh air if desired.
On the first blower setting with the a/c switch on, the air in recirculated mode & the temperature conrol knob on cold (most relevant in hot parts of India, which is pretty much everywhere!) your compressor cycles between off & on pretty often, as the a/c presumes you'd like to keep it cool but not cold. This is also the most economical mode of driving with the a/c on.
Level two on the blower increases the fan speed & also cycles the compressor less, with it going off less often.
Level three puts off your compressor even less than that, & only when it's close to freezing.
Level four simply leaves the compressor on (at least I've never seen it go off) & chills your cabin till your teeth rattle & you have sweat icicles forming off the front of your eyebrows. Polar bears are most comfortable at this setting, though some of them have been known to complain (there's no pleasing some animals!).
There is also a sensor on your throttle (sometimes below the accelerator pedal) that figures out when you want more power from your vehicle (like during overtaking manoeuvres) & cycles the compressor off. This of course, was unless you had a Premier 118 NE, which used to do it arse-backwards, by turning on the compressor when you accelerated, & turning it off when you were standing still & idling in traffic.
Anyways, enough typing. Somebody else should now explain further...
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this is what supreme baleno said-
Originally Posted by Floyd de Souza
Does fuel consumption increase as you shift the temp control to the right i.e. towards the red zone? A mechanic (supposed to be good with car AC's) told me that fuel consumption will increase as more hot air gets mixed with the cold air from the AC and hence the AC has to work harder and this has a negative effect on fuel consumption. He suggested that the knob should be at the coolest point and the AC should be switched on and off to maintain the desired temperature. In my Baleno. I feel that the compressor cuts off earlier as the knob is moved towards the red zone.
Well, MUL says the same thing as your mechanic - keeping the temp control at any setting other than the extreme cold will result in warm air mixing with cold air.
Evening drives have been an issue for me because even with the blower at lowest speed, it gets damn cold in the Baleno. So initially I used to do what your mechanic said, switch off the A/c when it gets too cold. But then, the drawbacks are getting distracted from driving due to frequently having to switch on and off the a/c and possible damage to the switch due to too much usage. Currently what I do is move the temp control to the right, till almost the centre where the cold range starts. This keeps the inside temp at a reasonable level and I am quite satisfied.
However, I am not sure about the effect on FE due to this practice. I do not think it will reduce the FE (as I also see frequent compressor cut-offs in this mode), but don't have any stats to prove the point.
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Last edited by supremeBaleno : 5th February 2007 at 12:37.
so i think my point is true.atleast i was fooled into beliving that compressor will be straining less when a warmer temperature is selected. |