12 Volt Electric Blower Motor For W/RESISTOR KENWORFH/PETERBILT W205700800 W205 7008 00 CCW WXB0434

Product Overview

Description

12 Volt Electric  Blower Motor  For W/RESISTOR KENWORFH/PETERBILT  W205700800   W205 7008 00  CCW WXB0434 

 

 

PIC:

 

 

 

 

  

 

Compressors and Mount & Drive:

Mount & Drive

Consists of a bracket to mount the compressor to the engine, a belt idler pulley, compressor

drive belt and possibly and extra drive pulley for the crankshaft.

Compressor Mount

Manufactured of either plate, cast iron, steel or aluminium, this bracket should exhibit

excellent noise absorption qualities especially if using a piston type compressor.

Idler Pulley

A small pulley normally used in conjunction with a belt adjusting mechanism, also used when

a belt has a long distance between pulleys to absorb belt vibrations.

Drive Pulley

Some vehicles do not have an extra pulley to accommodate an A/C drive belt, in these

cases an extra pulley is bolted onto the existing crankshaft pulley.

 

 

Theory

Principles of Air Conditioning

(Expansion Valve System)

1)High pressure side

Low pressure R134a vapor entering the compressor is compressed to become high pressure/temperature R134a vapor. This is then circulated along with lubricant oil to the condenser. As the high pressure/temperature vapor travels through the condenser, heat is released to the cooler ambient air passing over the condenser tubes condensing the vapor into a liquid. This high pressure/temperature liquid then travels through the filter drier onto the expansion valve where a small variable orifice provides a restriction against which compressor pushes.

 

 

2) pressure side

Suction from the compressor pulls the high pressure/temperature liquid R134a through small variable orifice of the TX valve and into the low-pressure side of the A/C system.

The R134a is now under low pressure/temperature vapor where heat from the cabin being blown over the evaporator coil surface is absorbed into the colder low pressure refrigerant The R134a is then pulled through the evaporator and into the

compressor.

The A/C cycle begins again as the R134a vapor is compressed and discharged under pressure.

 

 

3)Heat transfer

R134a in the LOW-PRESSURE side is COLD and can absorb large quantities of heat from the air moving over the evaporator.

R134a in HIGH-PRESSURE side is HOT and the cooler ambient air moving over the condenser can absorb the heat from it.

Summary

- When the R134a pressure is low, the R134a temperature is low.

- When the R134a pressure is high, the R134a temperature is high.