Air Conditioning and Heating System
Layout of Air Conditioning and Heating System
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| Illustration 1 | g02253319 |
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Typical example (1) Control panel (2) Vent (Rear) (3) Refrigerant receiver-dryer (4) Refrigerant condenser (5) Refrigerant compressor (6) Heater supply hose (7) Heater return hose (8) Refrigerant supply hose (High-pressure) (9) Refrigerant return hose (Low-pressure) (10) Drain hose (11) Vent (Floor) (12) Duct (Straight) (13) Vent (Defrost) (14) Vent (Front) (15) Vent (Defrost) (16) Heater/Air conditioner unit | |
Air Conditioner and Heater Unit
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| Illustration 2 | g02318753 |
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(1) Motor assembly (Air outlet)
(2) Motor assembly (Air blend) (3) Heater core (4) Sensor (Evaporator) (5) Sensor (Water temperature) (6) Fan control (7) Relays (Refrigerant compressor, Condenser fan motor, and Blower motor) (8) Filter (9) Sensor (Intake air temperature (Recirculated air)) (10) Motor assembly (Air inlet) (11) Expansion Valve (12) Evaporator Coil Assembly (13) Blower motor | |
Note: A condenser fan motor relay (7) is not required for machines that have the refrigerant condenser located in the cooling system compartment.
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| Illustration 3 | g02320275 |
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(A) Air inlet (Fresh air)
(B) Air inlet (Recirculated air) (C) Air outlet (Floor) (D) Air outlet (Defrost) (E) Air outlet (Cab) (1) Evaporator coil (2) Blower motor (3) Motor assembly (Air inlet) (4) Filter (5) Motor assembly (Air blend) (6) Heater core (7) Motor assembly (Air outlet) | |
Routing of Refrigerant Hoses and Coolant Hoses
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| Illustration 4 | g02322313 |
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Typical example (1) Engine (2) Heater supply hose (3) Refrigerant compressor (4) Refrigerant receiver-dryer (5) Refrigerant supply hose (High-pressure) (6) Refrigerant return hose (Low-pressure) (7) Air conditioning and heating unit (8) Heater return hose | |
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| Illustration 5 | g03650337 |
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Typical example (1) Engine (2) Heater supply hose (3) Refrigerant compressor (4) Refrigerant supply hose (High-pressure) (5) Refrigerant condenser (6) Refrigerant receiver-dryer (7) Air conditioning and heating unit (8) Refrigerant return hose (Low-pressure) (9) Heater return hose | |
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| Illustration 6 | g02254659 |
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(1) Air outlet select switch
(2) Temperature switch (Increase/Decrease) (3) LCD panel (4) Fan switch (Increase/Decrease) (5) Air inlet select switch (Recirculated/Fresh air) (6) Defrost switch (7) Compressor ON/OFF switch (8) Main power ON/OFF switch (9) Automatic temperature control switch | |
Control Panel Switch Operation
Refer to Table 1 and Table 2 for information regarding the operation of the control panel switches.
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| Control Panel Switch Operation | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ON/OFF | AUT | A/C | Blower | |||||||||
| Main Power | Automatic Temp Control | Compressor | Fan Switch (Increase/Decrease) | |||||||||
| ON | OFF | AUTO | ON | OFF | Lo | M1 | M2 | M3 | M4 | Hi | ||
| LCD(1) | AUT | − | X | O | (2) | X | X | X | X | X | X | X |
| A/C | − | X | O | O | X | − | − | − | − | − | − | |
| Blower Lo | − | X | AUTO | − | − | O | X | X | X | X | X | |
| Blower M1 | − | X | − | − | X | O | X | X | X | X | ||
| Blower M2 | − | X | − | − | X | X | O | X | X | X | ||
| Blower M3 | − | X | − | − | X | X | X | O | X | X | ||
| Blower M4 | − | X | − | − | X | X | X | X | O | X | ||
| Blower Hi | − | X | − | − | X | X | X | X | X | O | ||
| Set Temp | − | X | O | O | O | O | O | O | O | O | O | |
| Vent | − | X | AUTO | − | − | − | − | − | − | − | − | |
| B/L | − | X | − | − | − | − | − | − | − | − | ||
| FOOT | − | X | − | − | − | − | − | − | − | − | ||
| F/D | − | X | X | − | − | − | − | − | − | − | − | |
| DEF | − | X | X | − | − | − | − | − | − | − | − | |
| Recirculated Air | − | X | − | − | − | − | − | − | − | − | − | |
| Fresh Air | − | X | − | − | − | − | − | − | − | − | − | |
| Control Operation(3) | Air Blend Motor Control | (4) | Immediately Stops During Operation | (4) | (4) | (4) | (4) | (4) | (4) | (4) | (4) | (4) |
| Air Outlet Motor Control | − | AUTO | − | − | − | − | − | − | − | − | ||
| Air Inlet Motor Control | − | Recirculated Air | − | − | − | − | − | − | − | − | − | |
| Compressor Clutch Control | − | Stop | ON | ON | OFF | − | − | − | − | − | − | |
| Air Flow Control | − | Stop | AUTO | − | − | Lo | M1 | M2 | M3 | M4 | Hi | |
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| (1) | Explanation of LCD: "O" is always ON, "X" is always OFF and "−" maintains the setting |
| (2) | OFF when AUT is ON. ONwhen AUT is OFF. Additionally, mode and flow amount automatic control is activated. Refer to Table 2. |
| (3) | Explanation of Control Operation: "−" maintains the setting |
| (4) | Automatic control, but when temperature is set at COOL-MAX, the damper is fully closed, but when temperature is set at HOT-MAX, the damper is fully open. |
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| Control Panel Switch Operation | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Set Temperature | MODE | Recirculated/Fresh Air | |||||||||
| Temperature Control Switch | Air Outlet Select Switch (Increase/Decrease) | Defrost Switch | Air Inlet Select Switch | ||||||||
| COOL MAX | − | HOT MAX | VENT | B/L | FOOT | F/D | DEF | Recirculated
Air |
Fresh
Air |
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| LCD(1) | AUT | (2) | − | − | X | X | X | X | X | − | − |
| A/C | O | − | − | − | − | − | − | − | − | − | |
| Blower Lo | X | − | X | − | − | − | − | − | − | − | |
| Blower M1 | X | − | X | − | − | − | − | − | − | − | |
| Blower M2 | X | − | X | − | − | − | − | − | − | − | |
| Blower M3 | X | − | O | − | − | − | − | − | − | − | |
| Blower M4 | X | − | X | − | − | − | − | − | − | − | |
| Blower Hi | O | − | X | − | − | − | − | − | − | − | |
| Set Temp | O | O | O | O | O | O | O | O | O | O | |
| Vent | O | − | X | O | X | X | X | X | − | − | |
| B/L | X | − | X | X | O | X | X | X | − | − | |
| FOOT | X | − | O | X | X | O | X | X | − | − | |
| F/D | X | − | X | X | X | X | O | X | − | − | |
| DEF | X | − | X | X | X | X | X | O | − | − | |
| Recirculated
Air |
− | − | − | − | − | − | − | − | O | X | |
| Fresh
Air |
− | − | − | − | − | − | − | − | X | O | |
| Control Operation(3) | Air Blend Motor Control | (4) | (4) | (4) | (4) | (4) | (4) | (4) | (4) | (4) | (4) |
| Air Outlet Motor Control | VENT | − | FOOT | VENT | B/L | FOOT | F/D | DEF | − | − | |
| Air Inlet Motor Control | − | − | − | − | − | − | − | − | Recirculated Air | Fresh Air | |
| Compressor Clutch Control | ON | − | − | − | − | − | − | − | − | − | |
| Air Flow Control | Hi | − | M3 | − | − | − | − | − | − | − | |
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| (1) | Explanation of LCD: "O" is always ON, "X" is always OFF and "−" maintains the setting |
| (2) | ON when mode and flow amount automatic control is activated. |
| (3) | Explanation of Control Operation: "−" maintains the setting |
| (4) | Automatic control, but when temperature is set at COOL-MAX, the damper is fully closed, but when temperature is set at HOT-MAX, the damper is fully open. |
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