Friedrich SS12N10* User Manual

44

8.   Pressurize sealed system with a combination of R-410A 

and nitrogen and check for leaks, using a suitable leak 

detector. Recover refrigerant per EPA guidelines. 

9.    Once the sealed system is leak free, install solenoid coil 

       on new valve and charge the sealed system by weighing    

       in the proper amount and type of refrigerant as shown 

       on rating plate. Crimp the process tubes and solder the 

       ends shut. Do not leave Schrader or piercing valves in 

       the sealed system. 

NOTE: When brazing a reversing valve into the system, it is 

of extreme importance that the temperature of the valve does 

not exceed 250

°F

 at any time.

Wrap  the  reversing  valve  with  a  large  rag  saturated  with 

water.  “Re-wet”  the  rag  and  thoroughly  cool  the  valve  after 

each brazing operation of the four joints involved.

The  wet  rag  around  the  reversing  valve  will  eliminate 

conduction of heat to the valve body when brazing the line 

connection.

6.       Protect new valve body from heat while brazing with  plastic 

heat sink (Thermo Trap) or wrap valve body with wet rag.

7.    Fit  all  lines  into  new  valve  and  braze  lines  into  new   

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 44, 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.

The use of nitrogen requires a pressure

regulator. Follow all safety procedures and 

wear protective safety clothing etc. 

Failure to follow proper safety procedures 

could result in serious injury or death. 

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.