Friedrich 000 BTU'S Manual Do Utilizador

32

tEStIng tHE CoIL 

 

The solenoid coil is an electromagnetic type coil mounted 

on the reversing valve and is energized during the 

operation of the compressor in the heating cycle.

1.   Turn off high voltage electrical power to unit. 
2.   Unplug line voltage lead from reversing valve coil. 
3.   Check for electrical continuity through the coil. If you 

do not have continuity replace the coil. 

4.   Check from each lead of coil to the copper liquid line 

as it leaves the unit or the ground lug. There should 

be no continuity between either of the coil leads 

and ground; if there is, coil is grounded and must be 

replaced. 

5.   If coil tests okay, reconnect the electrical leads. 
6.   Make sure coil has been assembled correctly. 
NOTE: Do not start unit with solenoid coil removed from 

valve, or do not remove coil after unit is in operation. This 

will cause the coil to burn out.

NOTE: You must have normal operating pressures before  

the reversing valve can shift.

Check  the  operation  of  the  valve  by  starting  the  system 

and  switching  the  operation  from  “Cooling”  to  “Heating” 

and then back to “Cooling”. Do not hammer on valve.
Occasionally, the reversing valve may stick in the heating 

or cooling position or in the mid-position.
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 

Unplug  and/or  disconnect  all  electrical  power 

to  the  unit  before  performing  inspections, 

maintenances or service. 

Failure to do so could result in electric shock, 

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. 

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.