Specifications

100
Data Parameters Climate Control Parameters
sensor (usually located in the receiver/dryer). Based on the refrigerant pressure, the IHKA
module anticipates the startup torque of the A/C compressor. If the pressure is too low or high
the compressor will be deactivated. This input may also used to vary the auxiliary fan speed.
VENTILATION FLAP MOTOR (FRESH AIR FLAPS)(%)
Range: ______________________________________________________ not available
This parameter indicates the IHKA command position for the fresh air flaps. At 0%, the flaps
should be fully closed and at 100% fully open. These flaps are controlled through a stepper
motor which can adjust flaps in very fine increments.
Y FACTOR(%)
Y CONTROL(%)
Range: _____________________________________________________ –27.5 to 100%
This parameter is used to describe how much heating or cooling effort the system is putting out
to achieve the desired interior temperature. Other names for “Y Factor” are “Adjusting Factor,”
“Master Controller” or “Guide Control.” The climate control module calculates the Y Factor (on
the IHKA dual control, there are two factors: left, or driver, and right, or passenger) based on the
system's temperature inputs. Values of -27.5 to 20% indicate the climate control module is trying
to cool the vehicle. Values of 20 to 100% indicate the climate control module is trying to heat the
vehicle.
The climate control module computes the Y Factor based on three main inputs:
• Interior temperature
• Vehicle occupants’ command for temperature
• Vehicle occupants’ command for heat or A/C
On systems with dual controls, the left desired temperature has priority over the right when the
left is set to either the minimum or maximum desired value.