Friedrich H)A12K25L 사용자 설명서

26

When  sluggish  or  stuck  in  the  mid-position,  part  of  the 

discharge gas from the compressor is directed back to the 

suction side, resulting in excessively high suction pressure. 

 

Should  the  valve  fail  to  shift  from  coooling  to  heating, 

block the air flow through the outdoor coil and allow the 

discharge pressure to build in the system. Then switch the 

system from heating to cooling.

If the valve is stuck in the heating position, block the air 

flow through the indoor coil and allow discharge pressure 

to build in the system. Then switch the system from heating 

to cooling.

Should the valve fail to shift in either position after increasing 

the discharge pressure, replace the valve.

Dented  or  damaged  valve  body  or  capillary  tubes  can 

prevent the main slide in the valve body from shifting.

If you determing this is the problem, replace the reversing 

valve.

After all of the previous inspections and checks have been 

made  and  determined  correct,  then  perform  the  “Touch 

Test” on the reversing valve. 

Procedure For Changing Reversing Valve 

1.     Install Process Tubes. Recover refrigerant from sealed 

 system. PROPER HANDLING OF RECOVERED 

 REFRIGERANT ACCORDING TO EPA REGULATIONS 

 IS REQUIRED. 

2.      Remove  solenoid  coil  from  reversing  valve.  If  coil  is  to 

 be reused, protect from heat while changing valve. 

3.     Unbraze all lines from reversing valve.

4.      Clean  all  excess  braze  from  all  tubing  so  that  they  will 

 slip into fittings on new valve. 

5.    Remove solenoid coil from new valve.  

The  use  of  a  torch  requires  extreme  care  and  proper 

judgment.  Follow  all  safety  recommended  precautions 

and  protect  surrounding  areas  with  fire  proof  materials. 

Have a fire extinguisher readily available. Failure to follow 

this  notice  could  result  in  moderate  to  serious  property 

damage.

 

 

 

 

The only definite indications that the slide is in the mid-

position is if all three tubes on the suction side of the valve 

are hot after a few minutes of running time. 

NOTE: A condition other than those illustrated above, and  

on Page 31, indicate that the reversing valve is not shifting 

properly. Both tubes shown as hot or cool must be the same 

corresponding temperature. 

Certain unit components operate at 

temperatures hot enough to cause burns.

Proper safety procedures must be followed, 

and proper protective clothing must be 

worn. 

Failure to follow these procedures could 

result in minor to moderate injury.

Sealed Refrigeration System contains refrigerant 

and oil under high pressure.

Proper safety procedures must be followed, 

and proper protective clothing must be worn 

when working with refrigerants.

Failure  to  follow  these  procedures  could 

result in serious injury or death.