Backyard Ice rink chiller

[ClimateCo]

I have a couple of back yard ice rink chillers, I’m in Canada so these only run from say November - April the latest, where outdoor temps are about 60f to -4f. They are both TXV air cooled units which are located outside. So my question is when charging by subcooling would I try to replicate the ambient temp to my condenser (blocking off/fan off) at the expected highest temp of 60f? These units run on 404 for a set point of 16-18f. So the evaps are around 10f.

Thanks

[BALloyd]

Do they have a receiver?

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[ClimateCo]

Yes they both consist of 2 circuits each circuit has its own receiver

[Healey Nut]

Take the gas out and charge it by weight shown on the nameplate .

[ClimateCo]

Both plates are illegible

[ehsx]

Depends on a few things. Is it flooded head pressure control with a headmaster? How is the receiver piped in? Liquid subcooler after receiver? Condenser fan vfd’s?

Would try to find the vendor im information.

[ClimateCo]

The receivers are teed into the compressor discharge with an OROA, out of the condenser into the bottom of OROA and out of the receiver to the TXV. No subcooler and the fans are just on/off w pressure control

[ehsx]

Will have to charge based on receiver level.
Easier at highest operating ambient , receiver @ ~80%. Coldest day liquid seal at bottom of receiver.

[ClimateCo]

How do you know the receiver level?

[ehsx]

How do you know the receiver level?

If no sightglasses may have to go by temp.

[ClimateCo]

There is a liquid line sight glass just after the receiver. So charge until it clears?

[ehsx]

There is a liquid line sight glass just after the receiver. So charge until it clears?

At lowest ambient

[ClimateCo]

How would I replicate -4f ambient??

[ehsx]

How would I replicate -4f ambient??

Keep the glass clear. Recheck as ambient drops.
If possible find the equip model number and find the vendor literature.

[stanbyyourword]

sight glass?

[stanbyyourword]

Keep the glass clear. Recheck as ambient drops.
If possible find the equip model number and find the vendor literature.

exactly

[Healey Nut]

With a flooded condenser and no nameplate info . Your going to have to clear the glass then go back on the coldest day of the season and clear it again .