Maytag 56326 Spezifikationen PDF herunterladen (Seite 27)

LEAK TESTING

The

following

general

information

ex-

plains

several methods

of checking the

refrigeration

system

for

leaks. This infor-

mation

applies to

all systems covered in

this

manual.

lf there

is an undercharge

of

refrigerant

and the system has

not

been recently

opened, there is

probably

a leak in the

system. In that

case, it would

be only a

temporary

solution to

add

ref

rigerant

without

first locating

and repairing

the

leak

since

adding refrigerant

will not

per-

manently

correct the

difficulty.

The leak

must

be

located

and repaired

if

possible,

after which

the

entire system must

be

re-

charged

with the

proper

amount of refri-

gerant.

Whenever

a new

charge

of

refrigerant

is

added, it is

necessary

to in-

stall

a

new

drier.

Any

leak, regardless

of its

size, must

be

located

before

you

can

determine the

op-

erative

status

of the

system

components.

Do

not replace

a

component

because the

system is

short

of refrigerant

unless

a

non-repairable

leak

is found.

lf

your

analysis

indicates

a leak, find

it

before

opening the

system.

You

are more

likely

to

pinpoint

the

leak

before

dis-

charging

than if the

surrounding

air is

contaminated

with ref

rigerant

f rom

a

newly

opened

system.

The

presence

of oil

around a tubing

joint

usually indicates

a leak,

but don't let this

be the determining

factor.

Always

check

the area with

a

leak

detector

to make

sure.

To simplify leak

detection, keep

the sys-

tem

pressurized

to

a minimum

of 75 P.S.l.

This is

easily

accomplished

for high

side

testing

by merely running

the

compressor.

To

pressurize

the low

side,

allow the en-

tire

system to

warm

up to room temper-

ature.

Often

enough

refrigerant

may have

es-

caped to make it

impossible

to raise

the

pressure

enough to leak

test effectively.

In

cases of this

nature,

clamp a

piercing

valve to the

compressor

process

tube and

add enough refrigerant

to conduct the

test.

Leak

testing with

a Halide

torch is consid-

ered

satisfactory in

most

cases, but for

more

accurate testing,

we recommend

the

use

of a Dielectric

Differential Leak

De-

tector.

This

transistorized

model reduces

the

guesswork

in leak

testing

because it is

more

sensitive,

faster responding,

and

capable

of detecting

a

leak

even

though

the

surrounding

air is

contaminated.

The

leak

gun provides

an audible indication

of

a

refrigerant

leak.

3-7

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 158 159

Kommentare zu diesen Handbüchern

Keine Kommentare