Friedrich H)A09K34L Manuel D’Utilisation

 3.  Install a process tube to sealed system. 

4.  Make necessary repairs to system. 

 

5.  Evacuate system to 200 microns or less.  

 

6.  Weigh in refrigerant with the property quantity of R-410A     

refrigerant. 

 

7.  Start unit, and verify performance. 

8.  Crimp the process tube and solder the end shut.  

Proper safety procedures must be followed, 

and proper protective clothing must be worn 

when working with a torch.

Failure to follow these procedures could 

result in moderate or serious injury.

Proper safety procedures must be followed, 

and proper protective clothing must be worn 

when working with liquid refrigerant.

Failure to follow these procedures could 

result in minor to moderate injury.

Proper safety procedures must be followed, 

and proper protective clothing must be worn 

when working with a torch.

Failure to follow these procedures could 

result in moderate or serious injury.

The  acceptable  method  for  charging  the  RAC  system  is  the  

Weighed in Charge Method. The weighed in charge method  is 

applicable to all units. It is the preferred method to use, as  it is 

the most accurate. 

The  weighed  in  method  should  always  be  used  whenever  

a  charge  is  removed  from  a  unit  such  as  for  a  leak  repair, 

compressor  replacement,  or  when  there  is  no  refrigerant  

charge left in the unit. To charge by this method, requires the 

following steps:
1.  Install  a  piercing  valve  to  remove  refrigerant  from  the 

sealedsystem. (Piercing valve must be removed from  the 

system before recharging.) 

2.  Recover Refrigerant in accordance with EPA regulations.

Turn  off  electric  power  before  service  or 

installation.

Extreme  care  must  be  used,  if  it  becomes 

necessary  to  work  on  equipment  with  power 

applied.

Failure to do so 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. 

Undercharged Refrigerant systems 

An undercharged system will result in poor performance 

(low  pressures,  etc.)  in  both  the  heating  and  cooling 

cycle. 
Whenever  you  service  a  unit  with  an  undercharge  of 

refrigerant,  always  suspect  a  leak.  The  leak  must  be 

repaired before charging the unit. 
To  check  for  an  undercharged  system,  turn  the  unit  on, 

allow  the  compressor  to  run  long  enough  to  establish 

working pressures in the system (15 to 20 minutes). 
During the cooling cycle you can listen carefully at the exit 

of the metering device into the evaporator; an intermittent  

hissing  and  gurgling  sound  indicates  a  low  refrigerant 

charge. Intermittent frosting and thawing of the evaporator 

is  another  indication  of  a  low  charge,  however,  frosting 

and  thawing  can  also  be  caused  by  insufficient  air  over 

the evaporator. 
Checks for an undercharged system can be made at 

the compressor. If the compressor seems quieter than 

normal, it is an indication of a low refrigerant charge.  

 

A check of the amperage drawn by the compressor 

motor should show a  lower reading. (Check the Unit 

Specification.)  

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