Content .. 108 109 110 111 ..

Challenger Terra Gator 3244 Chassis. Manual - part 110

627333-A

5-33

HVAC Specification

HVAC SPECIFICATION

REFRIGERANT COMPRESSOR

Compressor

FIG. 1:

Torque for oil plug (1) 8 to 12 Nm (71 to 107 lbf in)

NOTE: Oil plug is pressurized

Type of compressor..............................................................................................Sanden International 4872-6000

Type of 4C-2959 Air Conditioner Lubricant.....................................................................................................SP-15

Oil capacity of compressor ................................................................................................. 199,92 mL (6,76 fl oz)

Type of refrigerant........................................................................................................................................... R134a

Filling ......................................................................................................................................... 1800 gram (3,97 lb)

Type of compression ................................................................................................................... 7 swing cylinders

Capacity of cylinders....................................................................................................... 155,7 cc/rev (9,5 in3/rev)

Power consumption........................................................................................................................................... 49W

Rotation..................................................................................................................................................... Clockwise

Maximum allowable continuous RPM...............................................................................................................6000

Clutch

Rotation..................................................................................................................................................... Clockwise

Voltage of magnetic clutch............................................................................................................................12 VDC

Relief Valve

Final installation torque.......................................................................................... 18 to 32 Nm (158 to 282 lbf in)

Opening pressure of relief valve ............................................................................................. 4137 kPa (600 PSI)

FIG. 1

q000314s

HVAC Specification

5-34

627333-A

Belt

FIG. 2:

Belt (2)...............................................................................................................................................................PV10

135-2151 Belt Tightener spring force at 25 degrees....................................... 12.4 to 15.8 Nm (9.1 to 11.7 lbf ft)

FIG. 2

MA3012004

627333-A

5-35

HVAC Testing and Adjusting

HVAC TESTING AND ADJUSTING

TROUBLESHOOTING MACHINE
PREPARATION

WARNING: Personal injury can result

from contact with refrigerant.

System is always under pressure, even if

engine is not running. Never apply heat to

a charged system.

Refrigerant contact can cause frostbite.

Keep face and hands away to prevent

injury.

Even if gauges indicate no refrigerant in

system, protective goggles must always

be worn when refrigerant lines are

opened.

Always use caution when removing a

fitting and always loosen fittings slowly. If

system is still under pressure, evacuate

and recover refrigerant before removing

fitting.

Personal injury or death can result from

inhaling refrigerant through a lit cigarette

or other smoking method.

Inhaling fumes released from a flame,

contacting with air conditioner refrigerant

gas, can cause bodily harm or death.

Do not smoke when servicing air

conditioners or anytime refrigerant gas

may be present.

Before checking air conditioning and

heating system, move machine to a level

surface and lower all implements to the

ground. Ensure transmission is in neutral

or park and parking brake is engaged.

Keep all other personnel away from unit or

where they are visible.

Before any problem solving procedures are performed,

refer to Testing and Adjusting, Visual Inspection. Make a

visual inspection of the complete air conditioning and

heating system.

•

All charging and leak testing must be done in a well-

ventilated area.

•

Avoid any physical contact with refrigerant as

contact can cause frostbite.

•

Always wear goggles when working on or testing

any part of the air conditioning system.

•

Place a clean cloth over any open valve or

connection.

•

Never weld, solder or steam clean any charged

components.

•

Do not smoke when recovering or recycling

refrigerant, charging, performing a leak test or

flushing the system.

•

Do not carry refrigerant drums in cab or expose

them to direct sunlight.

•

Dispose of any opened, but unused, oil that is poly

alkaline glycol (PAG). Moisture will contaminate

unused oil and the air conditioning system.

5-36

627333-A

HVAC Testing and Adjusting

GENERAL TROUBLESHOOTING
INFORMATION

•

Low refrigerant charge causes losses of cooling and

lubrication in compressor, results in failed

compressor.

•

Overcharge of refrigerant causes a loss of cooling

ability. An overcharged system contains excess

liquid refrigerant that can severely damage

compressor. An overcharged system fails at a rate

of twice an undercharged compressor.

•

Too much oil in system contributes to a low

refrigerant charge.

•

A small amount of moisture will penetrate the hoses

used in R134a systems. Change accumulator,

desiccant, and filter annually. Moisture causes

sludge resulting in a plugged system and can also

cause the formation of ice at the orifice of the tube

assembly.

•

When outside temperature is above 32 degrees C

(90 degrees F) or if the humidity is high, gauge

readings for an undercharged R134a system

appear as symptoms of overcharge. Incorrect

gauge readings lead to a loss of cooling ability and

compressor failure.

•

Removed refrigerant cannot be weighed accurately.

A 20 to 30 percent error can occur as a result of

inaccuracies of devices used for recovery.

•

Check scale for accuracy after every 30 days or

every 30 uses.

•

If system pressure rises above 0 kPa (0 PSI) within

five minutes of recovering a system, recover again

until pressure does not increase. Recovering

system again empties accumulator of refrigerant.

•

Presence of frost on accumulator is normal, the

thickness of frost depends on outside temperature

and humidity.

•

Perform regular maintenance on refrigerant service

units and change vacuum pump oil.

•

Secure lines and wires to prevent damage.

•

The formation of black sludge deposits in the

system is caused by moisture in R134a systems

and by mixing charges of R134a and R12.

•

The presence of white foam during recovery is

normal, it is caused by mixing oil and refrigerant.

•

R134a system charges must be within 0.03 kg (1oz)

to .06 kg (2oz) of specified charge for unit.

A loss of cooling ability or failure of compressor may be

caused by one or more of the following conditions.

•

Low charge

•

Overcharge

•

Too much oil

•

Dirty or plugged filter

•

Dirty or plugged condenser

•

Dirty or plugged evaporator

•

Dirty or plugged orifice tube

VISUAL INSPECTION

Before a performance check of the air conditioning

system, check the following:

1. Check condenser and evaporator.

a. Check for any restriction obstructing air flow

such as dirt, insects, plastic bags, etc.

2. Clean fresh air and recirculation filters.

3. Check for a loose belt on compressor.

4. Check drain tube on evaporator for obstruction.

5. Start unit and set air conditioner on HIGH. Place

hand on accumulator, a properly charged system

should feel cool or cold to the touch.

Content .. 108 109 110 111 ..