[Lalita03]

Hello Everyone,

I'm encountering an issue with my system.

The compressor reaches the cut-off pressure within an hour and then shuts off. What could be the possible causes? Could it be due to improper circulation of cold water through the condenser (co-axial heat exchanger)?

Why is the suction pipe/tubing consistently freezing and defrosting during operation?

Any insights would be appreciated!

 

[VTP99]

Throw us a bone
Model number ?

 

[pecmsg]

Because it tired and needs a rest?

 

[TechmanTery]

I assume its the high pressure switch?
Application? Res/Com ?

X2 pecmsg.

Its tired of working like crap.

 

[ksefan]

Hello Everyone,

I'm encountering an issue with my system.

The compressor reaches the cut-off pressure within an hour and then shuts off. What could be the possible causes? Could it be due to improper circulation of cold water through the condenser (co-axial heat exchanger)?

Why is the suction pipe/tubing consistently freezing and defrosting during operation?

Any insights would be appreciated!

The lack of information here is amazing for a ‘building engineer’ you should know we need pressure, temps, refrigerant type, application, low pressure cut off or high pressure. This would at least be a good start.

 

[ehsx]

 

[Lalita03]

High side pressure: 22.5 bar (326.33 psig),
temps: 76 Degree Celsius ,
refrigerant type: R 404a,
Application: Water Chilling
High pressure cutoff.

 

[Lalita03]

Yes, Its high side Pressure Cut-off,
Application is Water chilling.

 

[Lalita03]

Compressor Model Number: ZB95KQE-TFD-550 (Emerson )

 

[pecmsg]

Not enough or no water flow. if water cooled.

 

[TechmanTery]

High side pressure: 22.5 bar (326.33 psig),
temps: 76 Degree Celsius ,
refrigerant type: R 404a,
Application: Water Chilling
High pressure cutoff.

If the unit is shutting down by the Hi Press Safety then something is not right. The HPS switch should be opening closer to 500PSI.

 

[TechmanTery]

High side pressure: 22.5 bar (326.33 psig),
temps: 76 Degree Celsius ,
refrigerant type: R 404a,
Application: Water Chilling
High pressure cutoff.

If the unit is shutting down by the Hi Press Safety then something is not right. The HPS switch should be opening closer to 500PSI.

 

[pecmsg]

500 PSIG for R-404A?

 

[TechmanTery]

500 PSIG for R-404A?

Oh damn, I looked at 410a.
Tks,pecmsg

 

[TechmanTery]

High side pressure: 22.5 bar (326.33 psig),
temps: 76 Degree Celsius ,
refrigerant type: R 404a,
Application: Water Chilling
High pressure cutoff.

The HPS trip should be closer to 385 psi.

 

[BBeerme]

22 was 425, isn't 404A a bit higher than 22?

410 is 610-625, pretty standard.

 

[ehsx]

Need complete log.

 

[TechmanTery]

P/T or T/P,it doesn't make a diff. Lots of us talk about 'knowing the temp" is what the pressure side is related to. 45*SST evap has 8 diff press by using 8 diff freons.
What is max discharge line temp?
I thought that the hi press safety trip point was base on 150-155*F. SCT.
r22=400psi
r404=475 psi
r410= ?

 

[BBeerme]

Discharge line temp is a separate number with its own safety device, critical so as not to destroy the oil.

The the high pressure safeties I have seen on 410 equipment supplied from the factory have been 610 or 625*F.

P/T or T/P,it doesn't make a diff. Lots of us talk about 'knowing the temp" is what the pressure side is related to. 45*SST evap has 8 diff press by using 8 diff freons.
What is max discharge line temp?
I thought that the hi press safety trip point was base on 150-155*F. SCT.
r22=400psi
r404=475 psi
r410= ?

 

[BBeerme]

Generally accepted to be 225*F max. I like to stay well clear of that. Actual safetys from manufactures can vary quite a bit. These last several years I have see some at 225, I think that's because POE can handle a bit higher temps. But decades prior, the two main temps for those safety's were 190 and 210*F.

I always just kept 200*F in my mind; you get close to that, then maybe need to get some more cooling in that suction line.

P/T or T/P,it doesn't make a diff. Lots of us talk about 'knowing the temp" is what the pressure side is related to. 45*SST evap has 8 diff press by using 8 diff freons.
What is max discharge line temp?
I thought that the hi press safety trip point was base on 150-155*F. SCT.
r22=400psi
r404=475 psi
r410= ?