Kysor Warren Single Deck Meat Case

[dilvala]

Model M1A 12' long about 48' total

5hp compressor running 409a gas

I have a problem that none of the local repair tech are able to figure out. Even called in tech that KysorWarren recommended and still nothing.

Problem are 2 front -
Can not get the product temp below 40 degrees.
Evaporator is freezing up within 2 days of getting all the ice off it.

This unit has been in this building almost 25 years.

there are 6 - 25 min defrost cycle put in by the last tech. who also adjusted the superheat at each section of the open single deck meat case. he also checked the humidity in the store and it was around 45. there are no ducts blowing air on the case. the store temp does go above 75 to maybe 78.

the thermosatat is hooked up to a solenoid that is on the return line and that's all the controls the configuration.

the liquid line is cold and has a little frost right below the case i am not sure what else to do. Have been spending a lot of money and have no results.

I have to get the product below 40. and get the ice off the coils.

anyone able to repair this i am at zipcode 31021

[VTP99]

[QUOTE=dilvala;13681361]Model M1A 12' long about 48' total


the liquid line is cold and has a little frost right below the case

I would look here for your problem.
*****He corrected the line type.*****

[dilvala]

[QUOTE=VTP99;13681451]

Model M1A 12' long about 48' total


the liquid line is cold and has a little frost right below the case

I would look here for your problem.

its the bigger of the 2 pipes going to and coming from this case. not sure if that's the liquid line

[VTP99]

[QUOTE=dilvala;13681561]

its the bigger of the 2 pipes going to and coming from this case. not sure if that's the liquid line

That would be the suction line not liquid. How many TXV's are there ?

[dilvala]

[QUOTE=VTP99;13681581]

That would be the suction line not liquid. How many TXV's are there ?

4 one for each 12' section

[VTP99]

The case did work correctly at one time yes ?
R409 would run at about 22 psig. Do you know what that suction pressure was ?
Did he check all 4 TXV's ? What did he set them at ?
Does the system have a sight glass ?

[dilvala]

The case did work correctly at one time yes ?
R409 would run at about 22 psig. Do you know what that suction pressure was ?
Did he check all 4 TXV's ? What did he set them at ?
Does the system have a sight glass ?

Yes it worked great 3 years i been here. I am not sure the suction pressure, i just checked the slight glass and its clear. He did seem to adjust 3 of the 4 TXV's. To be honest 3 different repair man have adjusted it so i am not sure what they at currently. but i read it should be 6-8 super heat.

[VTP99]

What temperature are you running the cases ? Is the solenoid on the big or small line ?

[dilvala]

What temperature are you running the cases ? Is the solenoid on the big or small line ?

solenoid is on the small line. currently the thermostat is what controls the solenoid because i could hear the solenoid energize when i adjust the thermostat.


thermostat is set to 25. but the case temp are as follow 34 , 20 , 34, and 38

that is the reading i get on the built in thermometer - but the product temp is a whole different story.


All the fans are working and in the correct direction.

[VTP99]

solenoid is on the small line. currently the thermostat is what controls the solenoid because i could hear the solenoid energize when i adjust the thermostat.


thermostat is set to 25. but the case temp are as follow 34 , 20 , 34, and 38

that is the reading i get on the built in thermometer - but the product temp is a whole different story.


All the fans are working and in the correct direction.

Why is the temperature control set at 25* ? That is to low for medium temperature cases.

[dilvala]

The case that is currently showing 20* is where the thermostat is hooked up to. And I am thinking to get the other cases to the correct temp maybe that's why?

[VTP99]

That temperature controls needs to be at no lower then 34*
What is the defrost setup ? Does the system pump down and the compressor shut off in defrost mode ?

[dilvala]

That temperature controls needs to be at no lower then 34*
What is the defrost setup ? Does the system pump down and the compressor shut off in defrost mode ?

no pump down. just compressor shuts off. 6 - 25 mins cycle.