Whirlpool 470 用户手册
SEALED SYSTEM DIAGNOSIS REVIEW
Entering and properly processing the sealed refrigeration system requires special
equipment and time consuming, therefore a system should not be entered until it is
determined that it is at fault.
There are four conditions that make entering the sealed system necessary. They are:
equipment and time consuming, therefore a system should not be entered until it is
determined that it is at fault.
There are four conditions that make entering the sealed system necessary. They are:
1.
Incorrect amount of refrigerant
2.
Restriction of refrigerant flow
3.
Refrigerant leak
4.
Compressor not operating correctly
INCORRECT AMOUNT OF REFRIGERANT
1.
Low Charge Or No Charge Symptoms:
a.
Long or continuous running
b.
Partial frost or no frost on evaporator c. Low wattage
d.
Starts readily after stopping without pressure equalizing wait period.
e.
Intermittent hissing where cap tube enters evaporator
f.
Condenser and pre cooler than normal
Comments: Low charge or no charge is probably due to a leak. Find leak and repair.
Comments: Low charge or no charge is probably due to a leak. Find leak and repair.
2. Overcharge
Symptoms:
a.
Frosting or sweating suction line
b.
High freezer temperatures
c. High
wattage
d. Noisy
compressor
e.
Long or continuous running
f.
Condenser cool at outlet end, hotter than normal at inlet end
g. Compressor and pre cooler hotter than normal
Comments: If the system has ever operated properly, it isn't likely that it is overcharged
unless it has been recharged or refrigerant added. If overcharge is suspected, evacuate an
recharge the system with type and amount of refrigerant.
unless it has been recharged or refrigerant added. If overcharge is suspected, evacuate an
recharge the system with type and amount of refrigerant.
RESTRICTION OF REFRIGERANT FLOW
1.
Complete Restriction Symptoms:
a.
Continuous running
b.
No cooling of evaporator
c.
No sound of refrigerant flow at cap tube outlet
d.
Low wattage
e.
Condenser same temperature top to bottom
2.
Partial Restriction Symptoms:
a.
Partial frosted evaporator - slow progress of frost at start-up
b.
Lower than normal evaporator temperatures
c. Low
wattage
d.
Long or continuous running
Comments: Look for complete restriction at entrance to cap tube drier. Also
check newly made joints. For partial restrictions, look for kinked or mashed tubing, or a
clogged screen drier. Remove the restriction.
Comments: Look for complete restriction at entrance to cap tube drier. Also
check newly made joints. For partial restrictions, look for kinked or mashed tubing, or a
clogged screen drier. Remove the restriction.
18