- This topic has 5 replies, 3 voices, and was last updated 19 years, 8 months ago by
.
-
Posts
-
How is the temperature differential maintained between the fridge and freezer compartment in a fridge/freezer with a single compressor?
Re: A general technical question about fridge freezers.
The thermostat’s range in the fridge controls it. Also in almost all cases the freezer will start chilling first as the compressor cuts in but the temperature in the freezer isn’t “maintained” as such or monitored.
This is why, on these machines, if the ambient temperature falls outside the range of the fridge (generally below ~10-15oC) then the fridge doesn’t get warm enough to cut the stat in and the freezer defrosts.
K.
Re: A general technical question about fridge freezers.
You are asking something most repairers don’t need to know… I’m assuming we are talking fridge freezers with a single compressor and single stat attached to the fridge evaporator… The differential is determined at the design stage, and will be determined by the gas charge and pipe configuration.
Some of these appliances freeze the freezer evaporator first and then the fridge evaporator last… The fridge evaporator won’t start freezing until the freezer evaporator is close to its correct temperature.
Others pass the gas through the fridge evaporator first, but the fridge evaporator won’t get cold enough to switch the thermostat off until the low side (suction side of the compressor) gas pressure drops as the freezer reaches temperature.
If the fridge switches off before the freezer reaches temperature on this type of system, it will normally be due to a gas leak or blockage, faults that drop the low side gas pressure.Re: A general technical question about fridge freezers.
Thanks for the reply. So am I correct in understanding that the freezer when situated under the fridge is colder because it is “served” by the compressor first?
The reason I ask is beacuse I have fridge/freezer (fridge on top) whose fridge is cooling but whose freezer is warm?
You should never quote yourself… but;
Others pass the gas through the fridge evaporator first, but the fridge evaporator won’t get cold enough to switch the thermostat off until the low side (suction side of the compressor) gas pressure drops as the freezer reaches temperature.
If the fridge switches off before the freezer reaches temperature on this type of system, it will normally be due to a gas leak or blockage, faults that drop the low side gas pressure.
- You must be logged in to reply to this topic.