Kenmore 795. 72063.11 series Service Manual page 74

12-4 Check D
D1. Activate Protection logic
- We have to check Condenser fan and Freezer fan before performing Check D
- Locked Piston, Current trip and stroke trip can be activated by other problems then the driver or compressor.
Locked piston
Stroke trip
Current trip
D2. sealed system diagnosis
- Check as follows;
Check for Oil leaks
In machine compartment
No
Check for oil
Remaining in drip tray
No
Check Temp of
Discharge line
and Condenser
No
Is there frost
on Suction Line?
No
Comp,Cond T >
Ambient temp+5deg
Yes
Sealed System
is OK
→ When process line on compressor is opened, and refrigerant is not expelled
High Pressure
Side
→ If fault is corrected after refrigerant is recaptured from sealed system, change
Restricted
→ Low side restriction can cause a stroke trip.
Low
→ If fault is corrected after refrigerant is recaptured, perform a sealed
Side
Restriction
→ Check Suction line
Over charging → If refrigerant is overcharged and suction line temperature is lower
Refrigerant
→ Temp. of compressor and discharge line is normal to slightly higher.
Low side
Refrigeration
leak
→ Customer complains of longer run times and poor cooling performance.
→ Lack of refrigerant can, in some incidents, cause piston over travel.
Refrigerant leak → Pressure of refrigerant cycle is usually higher than ambient pressure,
Yes
Repair leak
at point where
Oil is present.
Yes
Check for Oil leakage
at each joint
of the Evaporator
A
Yes
No
Heavy repair
A
Cycle check with protection logic
because it has accumulated in condenser.
dryer.
system evacuation and dryer replacement.
than ambient temperature (about 5~10 degrees) or frost is present
150mm from where the suction line enters the compressor..
High side pressure is normal to slightly higher than normal
conditions. This is because condenser cannot condense the air
that is trapped in the condenser. The high side pressure and
temperature will not mimic the low side pressures and
temperatures.
therefore oil will flow out with the refrigerant at leak point.
A
In/Out Leakage
Evaporator
Leakage
Frost only
Check frost status
Evaporator inlet
Of Evaporator
Is frost pattern
uniform?
Yes
Sealed System
is OK
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Sealed system
Welding point
A
1. Comp process stub,
2. Comp discharge
Replace
3. Hot Line inlet
A
Evaporator
4. Drier inlet
5. Drier outlet
6. Evaporator inlet
7. Evaporator outlet
8. suction pipe
Heat Inlet tubing
using heat gun.
No
Is frost patern
Uniform?
Yes
OK
A