Dometic 630025 Instructions d'exploitation télécharger pdf (Page 45)

CHECK FOR SEALANT ALONG

EVAPORATOR BULKHEAD

(ENTIRE WIDTH OF UNIT)

no water enters the evaporator section, a watertight seal must

exist along the entire evaporator bulkhead which separates the

two compartments. Check for sealant along this entire section

and add sealant at any area where none is visible. Note that the

sealed portion extends up the sides of the unit.

13C. SEALED SYSTEM

A. RECHARGING

NOTE: The

Clean Air ActClean Air Act

Clean Air Act

of 1990 set guidelines in regard to

recapturing or disposition of refrigerants. Check with local

authorities for proper handling or evacuation of refrigerants.

The equipment items needed to properly evacuate and re-

charge a sealed system are: a piercing type clamp-on saddle

valve; a braze-on processing valve; a core removal tool; a

process tube fitting; a set of compound gauges; a vacuum

pump; equipment to weigh a precise amount of refrigerant; R-

22 refrigerant; gas welding equipment; a R-22 refrigerant leak

detector and recapturing or recycling equipment.

If you haveIf you have

If you have

not been properly trained in sealed system repairs, do notnot been properly trained in sealed system repairs, do not

not been properly trained in sealed system repairs, do not

attempt this procedure.attempt this procedure.

attempt this procedure.

NOTE:NOTE:

NOTE: This is not a thorough sealed system repair training

program. For additional information or training, you may

want to attend a basic air conditioning course at your local

college.

To drain the R-22 refrigerant, attach a clamp-on saddle valve

on the low side process tube. If the air conditioner does not

have a low side process tube, attach a saddle valve at the point

where you will add a process tube.

Slowly drain the R-22 refrigerant by using recapturing or

recycling equipment. Do not leave the clamp-on saddle valve

on the unit as it will cause leaks.

If you are going to use the braze-on processing valve, once

the refrigerant has been drained, use a tubing cutter and cut

the tube near the end. Do this on both the low and high side

processing tubes.

REFRIGERATION

PRESSURE GAUGES

SUCTION LINE

Next weld the process tube in place. We recommend using

a brazing material

which melts be-

tween 950° and

1450° Fahrenheit,

and contains a

minimum of 2%

silver, and 5% to

10% phospho-

rous. This type of

brazing material

does not require

the use of a flux to

join copper to cop-

per. If you are using the weld on the process valve, be sure

the valve core is removed before any heat is applied.

Connect the blue colored low pressure line of the com-

pound gauges to the charging port on the low side pressure

tubing. Next, connect the red colored high pressure line of

the compound gauges to the charging port on the high side

pressure tubing.

Next, connect the yellow colored line of the compound

gauges to the charging cylinder and add 2 or more ounces

of R-22 refrigerant to the sealed system and check all weld

joints for leaks. Allow the refrigerant to stay in the system

for at least 10 minutes. If a leak is detected, drain the

system and repair the leak before you proceed.

When you are certain the system is sealed, drain any

refrigerant from the system and connect the yellow com-

mon line of the compound gauges to the vacuum pump.

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Dometic 630025 Instructions d'exploitation Page 45

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