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06-12-2023, 11:40 PM

Bobjob1 replied to a thread Daikin UATYQ 350 MCY1 with OM5TBR-0709 controller in Air Conditioning

Thank you Frank, I have all that information , but I could do with a service manual if there is one !

2 replies | 28 view(s)

06-12-2023, 11:21 PM

frank replied to a thread Daikin UATYQ 350 MCY1 with OM5TBR-0709 controller in Air Conditioning

Here's a link to the only info I could find. http://www.daikintech.co.uk/01_Rooftop/Data/UATYQ.html

2 replies | 28 view(s)

06-12-2023, 07:02 PM

Bobjob1 started a thread Daikin UATYQ 350 MCY1 with OM5TBR-0709 controller in Air Conditioning

Hi all does anyone have information on the above Heat Pump Fan combination, I have been awaiting 3 days for Daikin to come back to me, escalated each...

2 replies | 28 view(s)

05-12-2023, 09:31 PM

NH3LVR replied to a thread Strange drop in compressor flow in NH3

First off my concern was the water. It used to be common here that companies would use Agricultural Ammonia. It contained water of unknown...

30 replies | 406 view(s)

05-12-2023, 08:35 AM

RANGER1 replied to a thread Strange drop in compressor flow in NH3

Make sure it has a good oil separator to avoid oil carry over. Instal an oil drain pot on bottom of gravity separator

30 replies | 406 view(s)

05-12-2023, 08:32 AM

RANGER1 replied to a thread Strange drop in compressor flow in NH3

I think when you pump down to 1bar you are lowering level in gravity feed vessel, it drops level so it does not work on restart. Turn off at...

30 replies | 406 view(s)

05-12-2023, 02:39 AM

aakbar replied to a thread Strange drop in compressor flow in NH3

The current one is very old..probably from 50's or 60's. It matches closely the compressors shown in Hand of Mechanical Refrigeration book from 1922....

30 replies | 406 view(s)

05-12-2023, 02:37 AM

aakbar replied to a thread Strange drop in compressor flow in NH3

I can talk to the operators about it. I think vacuuming might be helpful for unloaded start but its a question I've never asked.

30 replies | 406 view(s)

05-12-2023, 02:34 AM

aakbar replied to a thread Strange drop in compressor flow in NH3

Your suggestion makes sense. We will drain the evaporator and I will report back the results. I got hold of oil drain videos from last year. ...

30 replies | 406 view(s)

04-12-2023, 11:22 PM

NH3LVR replied to a thread Strange drop in compressor flow in NH3

What kind of compressors do you have? How much oil are they putting into the system?

30 replies | 406 view(s)

04-12-2023, 10:03 PM

RANGER1 replied to a thread Strange drop in compressor flow in NH3

I would suggest do not pump down to 1 bar, just turn off, close compressor suction if you must. If you have compressor crankcase heater it can be...

30 replies | 406 view(s)

04-12-2023, 06:56 PM

Tycho replied to a thread Strange drop in compressor flow in NH3

Since it only happens at start up, I would say it's a a plug or restriction in the liquid supply to the evaporator coils. as in oil has collected...

30 replies | 406 view(s)

04-12-2023, 06:38 PM

aakbar replied to a thread Strange drop in compressor flow in NH3

Video of water/oil mix from the LPR: https://youtube.com/shorts/-hjzZlq6R2A It is not recent. But it is for the system in question

30 replies | 406 view(s)

04-12-2023, 06:34 PM

aakbar replied to a thread Strange drop in compressor flow in NH3

They are connected the way you've shown in your diagram. I've drawn it with bottom connections for connivence.

30 replies | 406 view(s)

04-12-2023, 06:30 PM

aakbar replied to a thread Strange drop in compressor flow in NH3

We drain it every winter. I'll see if I can find any videos from last year..but the entire operation is quite difficult so we only do it once a year....

30 replies | 406 view(s)

04-12-2023, 06:25 PM

aakbar replied to a thread Strange drop in compressor flow in NH3

We don't have a separate vessel. I've attached picture of oil drain at the bottom of the vessel. I'll ask the operator to drain it of liquid and send...

30 replies | 406 view(s)

04-12-2023, 05:45 PM

Tycho replied to a thread Strange drop in compressor flow in NH3

Are you draining any oil from the evaporators? Seeing as the evaporators are the lowest point on the LP side, some oil is bound to move from the...

30 replies | 406 view(s)

04-12-2023, 05:17 PM

NH3LVR replied to a thread Strange drop in compressor flow in NH3

That is an LPR. So you do have a separate vessel underneath the LPR (usually called an oil pot) that you drain from? How much water are you getting?...

30 replies | 406 view(s)

04-12-2023, 04:23 PM

aakbar replied to a thread Strange drop in compressor flow in NH3

Yeah..we drain it from the low pressure receiver. Its the vessel that receives refrigerant from the High pressure receiver. There's an expansion...

30 replies | 406 view(s)

04-12-2023, 04:18 PM

NH3LVR replied to a thread Strange drop in compressor flow in NH3

Have not been following this closely, but are you draining water from the low pressure receiver? Perhaps we have the terms confused.

30 replies | 406 view(s)

04-12-2023, 03:02 PM

xixxi replied to a thread which one is good. in Fundamentals

Semi-hermetic Reciprocating Compressors offer easy serviceability but may generate noise and have lower efficiency. Scroll Compressors are known...

12 replies | 533 view(s)

04-12-2023, 02:35 PM

aakbar replied to a thread Strange drop in compressor flow in NH3

The anhydrator and OS1 bit aren't operational yet. When i was working on the HMI, I decided to add everything we will eventually have on the screen...

30 replies | 406 view(s)

04-12-2023, 02:33 PM

aakbar replied to a thread Strange drop in compressor flow in NH3

We have gauge glass on HPR. Here is what it showed at the time of these fluctuations. We have a danfoss electronic expansion valve. It...

30 replies | 406 view(s)

04-12-2023, 12:22 PM

seanf replied to a thread Strange drop in compressor flow in NH3

Is the anhydrator there because of moisture in the system, or a just in case sort of thing?

30 replies | 406 view(s)

04-12-2023, 10:29 AM

RANGER1 replied to a thread Strange drop in compressor flow in NH3

aakbar, Do you have any level indication on high pressure liquid receiver? Should be about 20% level when everything running normally. ...

30 replies | 406 view(s)

04-12-2023, 02:11 AM

aakbar replied to a thread Strange drop in compressor flow in NH3

Other system numbers right now Ignore Tank 1/2 evaporator pressures and Delta P values. Those PT's are undergoing replacement.

30 replies | 406 view(s)

04-12-2023, 02:02 AM

aakbar replied to a thread Strange drop in compressor flow in NH3

We switched the start up sequence and turned on compressor 5 mins before the condensers and witnessed the same result. You can view the result in the...

30 replies | 406 view(s)

02-12-2023, 10:28 AM

cricri replied to a thread Strange drop in compressor flow in NH3

Hello aakbar, your starting sequence is unusual for me. you should start compressor first and wait the HP to rise (pressure switch, HP sensor)...

30 replies | 406 view(s)

01-12-2023, 09:23 PM

seanf replied to a thread Strange drop in compressor flow in NH3

It makes me think that initially either theres not enough liquid being supplied to the LP receiver, or that theres something restricting the liquid...

30 replies | 406 view(s)

01-12-2023, 09:15 PM

xixxi started a thread NH3 T-S Diagram (Imperial) in Fundamentals

Hello, I'm in search of a Temperature-Entropy (TS) diagram for Ammonia in imperial units. I tried searching on Google but couldn't find anything. If...

0 replies | 52 view(s)