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We've done it multiple times on R513a reach ins. We generally replace drier, evacuate and charge R134a. Since these typically have captube metering devices we always watch it pull down and monitor...

There should be an electric heater inside. Verify it has power. Should be a j-box near the heated ventilator port. Don't chip the ice as you may damage the heater or the mechanism inside.

It sounds like you were observant and pretty thorough.

First impression is it sounds to me like a restricted drier. Although i still wouldn't rule out leaking system with moisture...

I have had some KE2 EEV's that hunted quite a bit, i think because they were a bit oversized for the application so generally ran in the 10-20% range. We experimented by adjusting the step rate in...

I worked on a taco chain that had several stores with identical custom cookline coolers. Very nicely done with staybrite and probably 10 years old or so. Most of the leaks were on the stay brite...

Suction sounds too high. Is compressor pulling proper amps and condenser clean?

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Lol! Was that a custom frost wall style evaporator? Seems like thats all i used to see back when i did McDonalds

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This video from HVACR videos on youtube has a similar setup discussed around 9:40 minute mark.

When no temp difference exists across the thermistors before and after TXV, the fans will slow down. ...

Just want to jump in to say, there seems to be some confusion about the EEV being opened 42%. That is not a problem, especially considering box at -5f. He said superheat 4-8f so that means its...

Just to throw some more fuel to the fire, lets not forget that Kramer actually patented a "Minimum Charge Monitor" and used it on production C and KS condensing units.

It was simply a...

What brand of EEV was it?

To further answer the OP's questions, the overload still provides protection against overcurrent even if not touching the compressor. So no, not ok to bypass even if they are hanging in the air.
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A lot of small Tecumseh TPA compressors have the overload mounted into the electrical terminal cover. The terminal covers usually break first time they are removed. After that the overload would be...

Great comments and questions. I have noticed on basically most R448a and r449a walk in condensing units, the liquid line now comes out of receiver and back into a subcooling circuit of the...

In a pinch if you have old worn out hard start 3n1 kits, you can pop the top off the start cap and it has an overload inside. The 1/3hp trips somewhere around 7 amps, 1/2hp trips around 13 amps.
...

Most kairak pan chillers I have seen use an electronic thermostat set to maintain 23-26f supply air at the axial fan above the drain. Keeping the drains clear is critical to preventing freezeups, as...

I have also observed the floating neutral on the Hoshizaki 115v side of the transformers. Definitely been shocked from grabbing one of those neutrals thinking it was safe.

The neutral wire on a...

Regarding the defrost cycle terminating on time instead of temp, make sure you dont have a weak heater safety dropping power to heaters before defrost termination temp is achieved. Also, if the...

Its equally important that the drain pan has enough slope that no water remains in the pan after defrost. If you have lazy little puddles not draining, sitting in the pan, that will become frost or...

Yes they typically seem to freeze up on the fan side of the evaporator. We usually reseal all the penetrations with silicone. Another common issue, defrost heater element gets shifted to one side...

On the inlet of the bypass tube, i think i see a little indention on right. Hard to tell because the red line covers it. But my vote is it has an internal check valve after the tee, and is actually...

Actually now that I look closer at the wiring diagram you provided, I see I was mistaken. The evaporator fans are powered on a separate terminal than the 4 terminal of the clock. It is on the...

I think he is talking about the electronic Emerson pressure switch controller thats just a part of the Copeland condensing unit. Not a Norlake temp defrost controller.

The controller is...

That may work for turning on the unit, and you may even be able to run the 5v signal through a mechanical thermostat. But how are you going to run the evaporator fans? Those are also normally...

Again, every Norlake capsule pak also has a Copeland condensing unit with its own model number. This does not sound like a hackjob. Its either a factory installed condensing unit or possibly a...

Probably a CPF075DC-A. CP for capsule pack, F for freezer

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All the Norlake r404a capsule pack freezers I thought worked pretty well. The older ones with mechanical TXV's always had pressure limiting Sporlan valves. Norlake has a long history of using...

Disabling the three "bump starts" on the Emerson pressure controller is as easy as changing the "bMP" paremeter. Here is the manual for the pressure controller (not the temp or defrost control).
...

Is it possible that a pipe plug left in the system stopped up the header above the first 2 inches?

Or maybe the coil mfg mispiped all of the u-bends except that bottom row so all other circuits in...

Looks to me like compressor's tilted and maybe thats why oil SG empty

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I think I remember icemeister recommending a little bit of drain line heat tape wrapped around txv / feeder tubes and wired to come on during defrost only, will work on units with this issue. I've...

Suction too high. Have you checked compressor run cap and condenser fan capacitors.

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Are the TXV bulbs mounted tightly and insulated?

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That is actually an extended medium temp condensing unit. It is technically rated for freezer use at 10k-15k depending on evaporator saturation temp (10.2k btu at -25f, to 14.9k btu at -10f, at...

What is the compressor amp draw?

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Have you confirmed the coil sensor is not reading warmer than the defrost termination temperature?

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I used to see the Perlick stats always mounted to a little clip with a single screw in the middle. The clip squeezes suction line on one end, and the coiled up thermostat capillary on the other end....

Its also very likely due to it being summer time that the DTC valve to keep compressor cool is continuing to feed some refrigerant from liquid line back into compressor shell, which adds to the short...

An oversized condensing unit (in relation to the evaporator) will run a lower suction pressure / suction saturation temp.

It will not necessarily overheat compressor. The TXV will meter...

I would pump down unit at receiver to confirm not overcharged. Assuming it is not, and head pressure doesn't rise more than 25psi during pumpdown, my thought it the compressor is a bit oversized for...

On all Danfoss compressors I have ever seen, Common is bottom center pin, Run is top left, Start is top right.

The advice given about resistance is still true, highest resistance is S to R, lowest...

You cannot calculate the superheat in Celsius and then convert that to Farenheit. If you want to calculate it in F, convert the numbers first and subtract.

-25c = -13f
-32c = -26f

So that is...

Correct. So right side is termination temp. Left side is differential. So fan delay is term temp - diff.

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For problem freezers, a lot of guys forget to check heater elements. Often heaters strapped to underside of coil get loose due to weak or rusted clips. So the heater cannot dissipate its heat into...

Truth be told you just want to melt the ice. If you defrost until the water evaporates and coil is dry, you get massive steam that puts icicles all over ceiling and clogs up fan guards with snow. ...

Yes. Looks like a pressure switch. Made by Ranco i believe.

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Try a Heatcraft 4267W. Fully adjustable def term fan delay.

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If its TXV with no receiver, I would adjust charge to about 5 - 8f subcooling with box at temp. Attaching liquid line to suction line and wrapping with foil tape before insulating will help keep the...

Piercing valve on the low pressure switch? Dang times are getting hard for that little guy! Could use a fan shroud too but hey, it still works. Pretty impressive.

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I've rebuilt several. On the self contained units, we would get the whole pre-assembled evaporator with fans, tstat, and lineset w/ captube soldered and piped all the way to drier and terminated...