Webasto BCT010300C Repair Manual download pdf (Page 31)

Troubleshooting – Refrigerant Compressor

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6.2.9 System Charging

Failure to properly charge the system can result in serious

injury or death from explosion or fire.

Follow these precautions when charging a system.

• Do not operate the compressor without a

charge in the system.

Operating the compressor without a charge in the

system can damage the hermetic terminal. As

always, to avoid serious injury or death from

terminal venting with ignition, never energize the

compressor unless the protective terminal cover is

securely fastened.

• Use proper refrigerant.

Use only R134a refrigerant when charging the

system. Using a different refrigerant can lead to

excess system pressure and an explosion. Use of a

refrigerant other than the serial label refrigerant

will void the compressor warranty.

• Do not overcharge a refrigerant or air

conditioning system.

Overcharging a refrigeration or air conditioning

system can result in an explosion. To avoid serious

injury or death, never overcharge the system.

Always use proper charging techniques. Limit

charge amounts to those specified in the original

equipment manufacturer’s service information.

In the case of the BlueCool Truck system, the

maximum refrigerant charge capacity using R134a

is 1.85 lb (0.84 kg).

Overcharging the system immerses the compressor

motor, rotor, and related parts in liquid refrigerant.

This creates a hydraulic block preventing the

compressor from starting. The hydraulic block is

also known as locked rotor.

Continued supply of electricity to the system

causes heat to build in the compressor. This heat

will eventually vaporize the refrigerant and rapidly

increase system pressure. If, for any reason, the

thermal protector fails to open the electrical circuit,

system pressure can rise to high enough levels to

cause a compressor housing explosion.

6.2.10 Prevention of System Explosions

In certain water-utilizing refrigeration systems, water can

leak into the refrigerant side of the system. This can lead

to an explosion of system components, including but not

limited to, the compressor. If such an explosion occurs,

the resulting blast can kill or seriously injure anyone in

the vicinity.

Water-utilizing systems that have single-wall heat

exchangers may present a risk of explosion. Such

systems may include:

• water source heat pump/air conditioning systems,

and

• water cooling systems, such as ice makers, water

coolers, and juice dispensers.

ATTENTION

Although the BlueCool Truck System does not apply to

this category of systems, it is still possible to

inadvertently introduce water into the refrigerant circuit

during repair. Therefore, it is extremely important that

proper care is used whenever refrigerant lines are

opened during repair. Lines should be temporarily

blocked to avoid water incursion. Always practice proper

purging and evacuation procedures when recharging the

system.

6.2.11 Start Capacitor Overheating

An overheated start capacitor can burst and spray or

splatter hot material which can cause burns. Applying

voltage to a start capacitor for more than a few seconds

can cause the capacitor to overheat.

Check capacitors with a capacitance meter, and never

check a capacitor with the power on.

6.2.12 System Evacuation

Never use a compressor to evacuate a system. Instead,

use a high vacuum pump specifically designed for that

purpose.

Never start the compressor while it is under deep

vacuum. Always break a vacuum with refrigerant charge

before energizing the compressor.

Failure to follow these instructions can damage the

hermetic terminal. As always, to avoid serious injury or

death from terminal venting with ignition, never energize

the compressor unless the protective terminal cover is

securely fastened.

6.2.13 Follow the Labels

Tecumseh Products Company compressors have labels

and markings with important information. For your

safety and the safety of others, read the labels and

markings on the product.

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Webasto BCT010300C Repair Manual Page 31

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