Discharge Pressure High in Ammonia System

Hi All, I'm new here
And my first post is about troubleshooting in ammonia refrigeration
So here's the thing
The system i'm working on is ammonia refrigeration system from 98
The issue right now is high discharge pressure, sometimes it could reach 17.5 barg in compressor in sensor, which is very high. One thing that i found out are piping from condensor to thermosyphon are cool, from thermosyphon there is 2 way, to high receiver and oil cooler, but somehow the piping to HR are kind of hot
The System using Mycom Compressor
N2520 : 2 unit
N2016 : 1 Unit
N1612 : 3 Unit
N160L : 2 unit
With Condensor Evapco PMC 631 : 2 Unit and PMC 536 : 1 unit
Where do i start to reduce the pressure issue, because any modification will required budget approval and takes time. I've got information about balancing line from High Receiver to Inlet line should be open, is it wrong? Because the Location are in Indonesia and we have no winter here

I will try to provide any information required

Thank you very much

Hi Ripjaws,
Yes balance line should be open.
Does system have automatic air purger, is it working & purging from each condenser drain?
Do all condenser water sprays & fans work?
Are your ammonia level Goodwin ALl Vessels& high pressure liquid receivers

[QUOTE=RANGER1;331506]Hi Ripjaws,
Yes balance line should be open.
Does system have automatic air purger, is it working & purging from each condenser drain?
Do all condenser water sprays & fans work?
Are your ammonia level Goodwin ALl Vessels& high pressure liquid receivers[/QUOTE

Hi Ranger1
My balance line are open but is that any rule for balance line? Because 2 of 3 balance line connected to Inlet Evapco, and the other one to outlet evapco

The system doesn't have automatic purger, only manual purger and purger point are from high Receiver and Balancing line from evapco (singel purger). I try touch the purger and it was very cool, I will update with purger photo and SLD purger soon

All Condensor water and sprays work normal
Ammonia pressure normalh

Ripjaws,
Any chance of a P&ID of pipework, or sketch obviously condenser, purge lines etc.

Seems problem solved ....