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Welcome to Just Answer! The machine you have uses what we call an 'Evaporator Pressure Regulator Valve' to control the temperature of each freezing cylinder. Most general appliance repair men do not see these types of valves often so are not familar with them... that is probably the case here.These valves are about the size of a small lemon, and have an adjustment stem on them that can be turned to increase the evaporator pressure and that raises the temperature of the freeze as well.Most commercial refrigeration repair shops are familiar with the valves and can easily adjust it for you.If you can tell me which direction you in from the center of the nearest city I might be able to find a qualified service company for you.Let me know, we can go from there without any time limit as long as you keep rating my replies positively.Thanks!Phil
Thank you for your information. I will check for those evaporator pressure regulator valves as per your description. Do you need special equipment to calibrate those valves or is it just of matter of turning a screw to adjust the evaporator pressure which I assume changes the temperature at the same time.
I have a good technical background, mechanical engineer, who likes to work with tools.
Also, if a technician is required, I`m located in St-Jerome, province of Quebec, (just north of Montreal), Canada.
Phil, your help is appreciated and I will get back to you once I take look at the machine in more details.
Hello again Paul, the EPRV valves fit in *series with the suction line* between the compressor and the evaporator, generally mounted midway between.CLICK HERE FOR SOME PICTURES. some of those diagrams are incorrectly drawn showing the EPRV mounted off of a tee (that is not correct of course)
EPRV designs vary... yours most likely has the pressure adjustment under a cap on one end, shown on some of the drawings.1/4 a turn changes the evaporator pressure quite a bit...1/2 to 1 degreeF in some cases. your ice cream stiffness is sensitive to less than 1 degreeF change.The way to adjust it without service gauges is to load the machine with product and let it stabilize for half an hour or longer, then turn the adjustment 1/4 of a turn counter clockwise.. keep good notes on what you do. Let it stabilize for at least 30 minutes.If the icecream gets even more stiff you are going in the wrong direction....turn the adjustment clockwise in that case clockwise 1/2 turn. That gives you a net 1/4 turn clockwise. Give it at least half an hour between 1/4 turn adjustments.You should be able to get it working right again.Stay in touch as needed.As long as you keep rating my responses positively I will hold the question open for you, and you will be able to get back to me for months after that if necessary.Phil
Hello Phil,Sorry about the delay but I was away and I had no access to Internet.
I have two questions.
Do I have to rate your service at each e-mail or at the end?
See attached sketches for pictures of the machine itself. After analyzing the problem here is what I found. The chocolate side freezes up and I think because the beater and compressor cut in (for a cycle) it does not stop or cut out for a long time and when this happen I have to switch to night shift for the compressor and beater to turn off. What controls the cut in and cut out of the beater and compressor? Is it the Ranco temperature controller?
If you refer to sketch no. 1 (and sketch no. 3) is this the evaporator pressure reducer valve you are referring to? There is only one on the chocolate side and none on the vanilla side.
Thank you for your patience
P.S. I don't know if you will be able to see the pictures!
I have to create an account in Flick and also find an electrical drawing.
I`ll get back to you once I have those. It might take a few days.
I`m back. Couldn`t find the wiring diagram inside the service panel so I had to get one from Electro Freeze. See attached file for the wiring diagram. They sent it in 4 pages so you are going to have to glue them together to get the full picture.
Also, I loaded some pictures in Flick. My user name is [email protected]".
Hope this helps.
e-mail [email protected]
PS. Phil I can`t attached the pdf file (wiring diagram). Do you know how?
I just e-mail to experts @ just answer.com attention alumalite the pictures and also the wiring diagram.
If you need more info, don't hesitate to contact me.
No problem Phil. Take your time.
Are you still there?
Did you look at the pictures on Flick?
I was on vacation for a week but now I'm back.
Anytime you can contact me.
The link is on Flick is paul_jean86.
The URL is http:[email protected]
Phil,The two Rancon temperature controllers that you see on the pictures are: one for the night and the other for day operation. I have a similar set up for the vanilla side. (there are a total of four, two for the chocolate(one night and one day) and ditto for the vanilla side. The model no. is(NNN) NNN-NNNN
The red/orange valve with the hexagonal screw (picture 1802) which I think is the thermal expansion valve; I have two, one for the chocolate and the other for the vanilla. The are located at the entrance of the evaporators.
There is also a third one, black with a hexagon screw (see picture 1802)which I don`t know what it`s for. I think it could be for milk storage container.
Also, I have the instruction sheet for the Rancon valve. Do you need a picture of the instructions?
Thank you. I shall do that, however it`s going to take me a couple of days since the machine is in a remote area about twenty miles from my home.
I`ll let you know a.s.a.p.
Here is what I found out.
Contrary to the vanilla side where the compressor cuts in and runs for 15 seconds and cuts out for several minutes depending on the load, the chocolate side (sometimes, not all the time) cuts in and keeps on running until we manually turn it off (by switching to the night shift mode) and this is when the ice cream freezes.
I did not touch the evaporator control valve screw because I think that the problem could be with the Ranco timer.
What do you think?
Your are right, they are thermostats and you see them on the first picture.
The make is Ranco and the model no. is(NNN) NNN-NNNN It has two adjustment screws one for differential and the other for range. I assume that the range one is for the temperature setting and the differential is for the cut-in/cut-out.
Thank you for your patience.
Phil I'm back,
I did what you asked me, however, wasn't too sure of myself, so I called a technician and he replaced the Rancon temperature controller.
So far the problem is solved.
I'm very satisfied with your help. I have two questions, first where can I rate your services and second is there a way I can leave you a tip.
Thank you and have good day Phil