312B, 320B, 322B, 325B, 330B and 345B Excavators Air Conditioning and Heating Systems with R-134a Refrigerant Caterpillar

(1) Heater/Air conditioner unit

(2) Fresh air filter

(3) Compressor

(4) Hose (low pressure)

(5) Hose (high pressure)

(6) Accumulator

(7) Condenser

(8) Temperature sensor in the cab

(9) Fresh air (ambient air) sensor

(10) In-line dryer with orifice tube

(12) Temperature sensor in the cab

(13) Damper actuators (under seat, recirculate and upper body)

(14) Relays for fan speed and a/c clutch

(15) Actuator for water valve

(A) Air outlet for upper body

(B) Air outlet for defrost

(C) Air outlet for under seat

(D) Air inlet for recirculated air

(16) Evaporator

(17) Heater core

(18) Blower motor

(A) Air outlet for upper body

(B) Air outlet for defrost

(C) Air outlet for under seat

(D) Air inlet for recirculated air

(19) Heater/Air conditioner unit

(20) Heater core

(21) Evaporator

(22) Condenser

(23) Compressor

(24) Accumulator

(25) Coolant return line

(26) Coolant supply line

(27) Supply line (liquid refrigerant of high pressure)

(28) Return line (liquid refrigerant of low pressure)

(29) In-line dryer

(30) Moisture indicator

(31) Orifice tube

(32) Water valve

(E) Engine