Russell RLH100H22-E condensing unit

[rhillz]

I'm working on a Russell RLH100H22-E condensing unit for a Med temp walk in box system. The system seems to be leaking freon. Unit was low on freon on Feb 2, so I charged about 3lbs r22. About 1 week later the system was extremely low again nearly flat. I recently performed a leak check on the unit but had no luck. No traces of oil spotted and when I pressurized the system with dry nitrogen the pressure did not seem to drop over a 1 hr period. Can there be something I'm not seeing overlooking? This system does have a reciever and operating without a fan cycle switch in 30f ambient temps. Any info would be helpful thanks

[icehouse]

I'm working on a Russell RLH100H22-E condensing unit for a Med temp walk in box system. The system seems to be leaking freon. Unit was low on freon on Feb 2, so I charged about 3lbs r22. About 1 week later the system was extremely low again nearly flat. I recently performed a leak check on the unit but had no luck. No traces of oil spotted and when I pressurized the system with dry nitrogen the pressure did not seem to drop over a 1 hr period. Can there be something I'm not seeing overlooking? This system does have a reciever and operating without a fan cycle switch in 30f ambient temps. Any info would be helpful thanks

Hi from "Shady Pines". First I would evacuate the system with a micron gauge attached. Being sure there are no pump down solenoid valves which my be closed.
Evacuate through both "High" and "Low" side to 500 microns. Isolate the micron gauge and carefully monitor it. A slow rise will indicate moisture in the system, whereas a rapid rise would indicate a leak.
Also when pressureizing with "Nitrogen" mixture along with R22 and use an electronic leak detector.

[Chris_Worthington]

Started a new thread for the new topic as requested

[jpsmith1cm]

Does the unit have a headmaster valve?

If so, it must be charged correctly.