PLATE AS.-SIDE 2975752 - Caterpillar

HVAC Blower Speed Control Position
The fan control position, controls the speed of the HVAC blower motor. Full counter clockwise position is the off position and the full clockwise position is the maximum fan speed. The dial is a potentiometer that provides an infinitely variable blower speed options allowing the operator to choose the correct airflow quantity. When switch (C) is in the bottom AUTO position, the blower speed dial determines the minimum possible blower speed used by the automatic temperature control software. In order to allow the automatic temperature control system to use the full range of the blower speed. Rotate the dial in the counter clockwise direction until it is at the minimum speed portion of the icon sweep.Note: Do not turn the blower speed dial to the full counter clockwise position unless you want to shut off the HVAC system.HVAC Auto Climate Control Switch and HVAC ON Switch
Illustration 3 g03028517The A/C selector switch is used to determine the operating mode for the HVAC system. The rocker switch has three positions. Bottom position, (C) in previous figure, sets the HVAC system into automatic temperature control mode. ECM located on machine controls A/C compressor clutch, water valve position, and desired blower speed automatically. Optional blower speed override is still available to the operator by using dial (A). Center position, (D) in previous figure, sets the A/C system into off mode but still allows operator manual control of the water valve and blower speed through dials (A) and ( B). Top position, (E) in previous figure, sets the HVAC system into manual A/C mode. The A/C compressor is permanently turned on and the operator has manual control of the water valve and blower speed through dials ( A ) and (B).High/Low Pressure Switch
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High-pressure switch
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Low-pressure switch
High/Low pressure switch, used to prevent unwanted high pressure and low-pressure conditions on the outlet of the A/C compressor. Low-pressure switch, used to prevent unwanted low-pressure conditions on the inlet side of the A/C compressor. Both the high/low and low-pressure sensors prevent operation of the A/C compressor during conditions of overcharge of the refrigerant and undercharge of the refrigerant.Outputs
Clutches
HVAC A/C Clutch
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(3) Magnetic clutch and pulley assembly
(4) Coil assembly
(5) Drive plate
(6) Bearing
(7) Compressor shaft The Implement ECM energizes the air conditioning clutch when the operator requests air conditioning and all of the conditions have been met.The compressor is driven by the engine. A belt connects the engine to the clutch and pulley assembly (3). The pulley assembly is located on the clutch. The drive plate (5) is fastened to the shaft of the compressor. The clutch and pulley assembly (3) turns on the bearing (6). The clutch and pulley assembly (3) are not connected to the shaft (7). The electric current from the thermostat controls a magnetic field in the coil assembly (4).The magnetic field pulls the drive plate (5) against the clutch and pulley assembly (3). The clutch and the pulley assembly (3) turns the shaft (7) that operates the compressor. When