OM3216 3/10 Operator Cab and Controls - Section 32 Page 32-5 HEATER / AIR CONDITIONER CONTROLS The heater/air conditioner compartment contains heater/air conditioner controls and some of the heater/air conditioner components, such as the blower motor assembly and the heater coil. Optimum cab air climate can be selected by using the following controls in various combinations. Heater/Air Conditioner Vents Heater/air conditioner vents (4, Figure 32-4) may be rotated 360°. There are three vents in the heater/air conditioner compartment, four vents across the top of the instrument panel, and one vent each in the RH and LH instrument panels.
There are also an addi- tional four vents under the instrument panel. Air flow through the vents is controlled by manually opening, closing or turning the louvers. Fan Control Knob Fan control knob (1, Figure 32-4) is provided to con- trol the cab air fan motor. The fan motor is a 3-speed motor (low, medium and high). Speeds are selected by rotating the control knob clockwise to the desired position. OFF is in the full counter-clockwise position. The fan control must be switched ON for the air con- ditioner to function. Temperature Control Knob Temperature control knob (2, Figure 32-4) allows the operator to select a comfortable temperature.
Rotating the knob counter-clockwise (blue arrow) will select cooler temperatures. Full counter-clockwise position is the coldest air setting. Rotating the knob clockwise (red arrow) will select warmer temperatures. The full clockwise position is the warmest heater setting. Air Conditioning & Heater Air conditioning and heater modes do not have sepa- rate ON/OFF controls. They are operated by moving the temperature control knob. When the knob is rotated far enough counter-clockwise, the a/c com- pressor will operate. When the knob is turned far enough clockwise, air flows through the heater core into the cab.
Air Flow Directional Knob Air flow directional knob (3, Figure 32-4) controls the direction of airflow as follows: FIGURE 32-4. A/C & HEATER CONTROLS 1. Fan Control Knob 2. Temperature Control Knob 3. Air Flow Directional Knob 4. Vents Provides airflow to floor vents, only. Provides airflow to upper vents and floor vents. Provides airflow to upper vents, only. Defrost - Provides dehumidified air to the windshield. Defrost - Provides dehumidified air to the windshield as well as to floor vents.