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#Rack Refrigeration@rackmaster_rva·3h ago

Hussmann rack tripping HP cutout intermittently — anyone seen oil migration cause this?

Two-stage rack, R-448A, parallel compression. HP cutouts only when ambient hits 95+. Discharge temps look fine, condenser is clean. Already swapped HP transducer.

38 replies

96

#Controls / DDC@ddc_dana·6h ago

Best approach for retrocommissioning a JCI Metasys site with no as-builts?

Took over a 400k sqft retail site. No DDC docs. Where do you start when you have to map sequences from scratch?

24 replies

78

#CO₂@co2_carlos·12h ago

Transcritical CO₂ — gas cooler approach temps trending up over 2 weeks

Anyone got a checklist for diagnosing rising approach temps before warranty calls Hillphoenix?

19 replies

64

#Hot Side@hotline_henry·1d ago

Vulcan combi oven steam generator scaling up monthly — water treatment shop?

Customer refuses RO. Filter cartridges aren't keeping up. What softener setups have you had luck with?

31 replies

51

#Chillers@chillking·1d ago

Trane CenTraVac surge — purge running constantly after recent rebuild

120psig purge cycles every 30 min. Approaches normal. Smells like a non-condensable load but I'm second-guessing the rebuild.

14 replies