MANIFOLD GP-RIDE CONTROL 4372879 - Caterpillar

Initialization
When the control module receives power, it shall first determine if it is in the OFF mode. If it is in the OFF mode, the controller will send the code for the OFF mode to the control panel. If the control module is in the ON mode, the controller shall determine the mode of operation (HVAC or Heat Only) based on the state of the sensor inputs.In the automatic fan mode, the fan speed will be low speed until initialization of the water valve takes place. After the sensor readings stabilize, the fan speed will then change to the control point speed. In the manual fan mode, the fan speed will be low speed until initialization of the water valve takes place and then change to the retrieved set point.Operation of Air Flow Modes
Illustration 1 g00396219
(1) Actuator for upper body (2) Actuator for under seat (3) Actuator for fresh air return (4) Actuator for water valve
Table 1
OPERATION OF MOTOR ACTUATORS    
SELECTED AIR FLOW MODE    POWERED ACTUATOR (2)    ROTATION    
DIRECTION DURATION (seconds)    
Upper Body     1     Counterclockwise     10.7    
2 Counterclockwise     10.7    
Under Seat     2     Clockwise     10.7    
1 Clockwise     10.7    
Upper Body and Under Seat     1     Counterclockwise     10.7    
2 Clockwise     10.7    
Defrost     1 (1)     Clockwise     10.7    
1 Counterclockwise     2.8    
2 Counterclockwise     10.7    
Fresh Air     3     Clockwise     10.7    
Recirculate     3     Counterclockwise     10.7    
( 2 ) Refer to illustration 1 for proper identification of actuators.
( 1 ) Actuator (1) moves in both directions in order to achieve the correct position for the Defrost mode.Note: Actuator (4) is part of the water valve assembly. This motor is actuated when the operator changes the set point by pushing INCREASE or DECREASE on the temperature selection switch. Refer to "Initialization" for further information.Note: Actuators (1), (2) and (3) are all the same. Refer to Systems Operation, "Motor (Air Conditioner Control)" for schematic information.Operation of the Automatic Temperature Control Mode (ATC)
Automatic temperature control switch While in the HVAC application, the receipt of the "AUT" temperature code causes the controller to enter the automatic mode of operation. In order to maintain cab temperature to the control point, the controller does the following:
It retrieves the cab temperature