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Thanks phase, that's how I thought it worked.

I'm starting to think the BMS boy is playing silly buggers with my controllers again.

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That thought had occurred to me...

Hi, I have a problem with a rack controlled by an E2 controller.

Due to a faulty AHU supply fan, the heat reclaim coil has been isolated.

My problem is that the building management controller,...

@phmtech
Follow the link in alcomechs post and read the second page.

I've had 2 different medium temp R22 rooms in the last year or so that were running with POE from new that shared the same problem.

They were both LP pumpdown systems.

After cycling off, they...

special person and personality.

Can't argue with that. It takes a masochistic fool.

I should know, I've been doing it for over 30 bloody years now.

I love it when the reps drop in to a forum.

It shows that they care about us poor buggers in the field.

Thanks for the link Tim.

Heatcraft sell a smallish one off the shelf over here.

depending on the size of your room it could do the trick.

Failing that, get your local sheet metal company to knock you up a stainless...

indeed.

play nicely you 2.

And I saw that episode of Big Bang.:cheers:

why? have you been professionally evaluated?

:grin2:

We don't use 120 here except for on control circuits in machines from over your way.

yes.

240 volt, a neutral and a separate ground.

We also have 415 volt single phase motors that use 2 phases.

If you follow me.

They're something of a rarity though. Kirby tend to use them on their 3 phase condensing units so you don't need...

1 active and a neutral tied to earth potential.

Oh, and it's 14:47, 9/12/12 (D/MM/YY)

Yes, all of our single phase motors are 240 volt single phase.

kind of counter intuitive, don't you think?

Here we switch all 3 phases.

If we loose 1 through a burnt contact, wire or fuse, the compressor is said to be 2 phasing.

occasionally I've seen 3 phase compressor where only 2 phases are...

Stop it royal, you've made me blush.

If you have only 1 phase hooked up to a 3 phase motor you'll have the same potential at all 3 terminals. nothing will happen till you connect another phase.

3 phases it will run, 2 phases it will...

Phase rotation doesn't matter unless it's a scroll compressor. You obviously have your proper 3 phases there or the new compressor wouldn't be running.

Out of curiosity, when you found the old...

If you just shut the system down by turning off the pump down switch in the cold room then left the site for 2 months what makes you think it stayed off for that period?

I assume there were...

2 phase, not single phase. if there's only 1 phase to it nothing will happen. 2 phases will cook it.

From what I've read here I assume you don't use residual currant devices much over there?

The more I learn about the power reticulation system used in the States, the more it horrifies me. :eek:
...

Couldn't agree more R123.
Mechs who rely on a multimeter to test resistance to ground (earth) run the risk of killing themselves or worse, their paying customer.

Here are a couple of links of...

Another possibility with an open face cooler is an airconditioning vent or door blowing the cold air out of the case.

If all else fails, get some dry ice in a tub with some water and put it in the...

In an infinite universe there's infinite room for stupid mistakes.

Sounds like your boy changed the valve, saw there was a problem with the new one and hoped it'd just go away.

A bit like a...

No baffles = air bypassing the condenser.

Are you talking multiple compressors on a parallel rack or multiple systems sharing a condenser?
It makes a difference for how you should control the...

That would be your supercritical fluid.

Above 31.1C and 7390Kpa (1071PSI)

Have a look at the youtube link at the bottom of jps post Robo.

It explains it pretty well.

Here's a link to an...

We've recently had a supermarket come online with a co2 system and will be taking on another 1in a few months when it comes online.

The present one uses an R134a rack for medium temp and for the...

I was toying with the thought that someone may have mixed up their oxy and nitro bottles.

If that were the case though, I'd expect to see blood and body parts in the photo... :censored:

The most efficient way to defrost a low temp box using electric heaters is to shut down the compressor and the liquid line solenoid valve at he same time.
...

The discharge gas in a scroll goes into a chamber in the top of the compressor, hence the high temperature at the top of the compressor.

I didn't realise you were in India. Here in Aus our gasses...

R22 is R22.

If you're worried about moisture or air in the system or of course, if you have to decant the system to change the oil, then, by all means, evacuate the system. I'd replace the drier...

That was meant as a joke enb.

As in there is Australian English, then there are dialects...

That's the trouble with Aussie humour. If I want outsiders to get it I have to include emoticons. :(...

If the system has an oil separator and the return line is connected to the sump, make sure it's closed before trying your pump down check.

Put both gauges on the compressor before you start...

I think that all but the first few posts have totally missed the point.

This is obviously the wrong condenser for the application.

The anti reverse bearing thingy is just a band-aid that...

I'm with you with the Dixell ice, but I'd go with a couple of cheap XR20CXs or, if the owner wants defrosts at set times, XR10s and a time clock or 2 with battery reserve.

The 400 series, in my...

Australian English? What? Is there another type?

You've got 17K superheat at the compressor and 108K superheat leaving on the high side, that is, if your system is running R22.

Assuming you have a full charge of gas in the system, you need to...

Good to hear mate.

Sometimes, after you've checked everything else and RTFM, you just have to bite the bullet and roll the dice.

Doesn't hurt to talk it through with your customer and explain...

Is this a mass produced box or a one off?

Does it have a crankcase pressure regulating valve?

More info and perhaps photos might help.

How did you charge it?

Are you sure the capillary is the righ tbore and length?

I assume it's on R404a?

Oh, and in what way was the compressor bad?

I use an MP15 phasefale relay sensing the output voltage from compressor contactors to protect them.

I also test the contactors by checking the voltage drop across the contacts. anything above...

I'd get some big pedestal fans up there to get the air moving first up Chuck.

Then I'd run a tape over the pipes and get some sheet metal boxing made up to cover them, rip off the old insulation...

So did you follow the link I supplied and read the manual?

It sounds like the board is faulty to me.

It sounds to me thetucks, like it's time you called in a professional.

So far you seem to have managed to not electrocute yourself.

If I were you I'd quit while I was ahead.

An inefficient compressor would have high suction and low head. it'd also tend to run hot eg: burn your hand hot.

A faulty run cap will also cause it to run hot.

Test the run cap with a proper...

I'd start here.

Of course, you'll want to find and rectify the cause of the oil fail.

Is this the control you're talking about?

If it is, go to page 43.

This could be a good starting point.

From what I read, I'd have a close look at the proximity switch.

It seems to be the only fault that doesn't bring up a code. Read the PDF from page 28 on.
...