L342 Refrigeration Lab, Concord, CA

The training lab was designed to have different components for apprentices. We provided and installed various pieces of equipment to prepare the apprentices for situations in the field.

The 5-compressor rack was built with several different compressors. The refrigerant is R-448, is subcooled and has both electric and hot gas defrost. 3 way valve on rack for Heat reclaim coil. A Trillium Condenser was used. The entire market lab is controlled by an E2

• Low temp
• Copeland Scroll
• Bitzer Recip
• Bitzer Recip with VFD
• Medium Temp
• Copeland Digital Scroll
• Copeland Discus

A combination of door, open, island and service cases along with a freezer walk-in and a deli cooler were installed which all employed different methods of control and defrost.

• Low temp cases use Dixcell case controllers with electric defrost
• One dual temp Island uses SSSV and ORITS with Kool Gas defrost
• Other dual temp Island uses CDST-4 valves for temp control with electric defrost
• Freezer walk-in is controlled by E2; temp probe and LLSV and is electric defrost
• Service meat case includes lift-up front glass and French door front glass. Suction stop solenoid
• Dairy/Deli uses CDST-7 valves for temp/off cycle defrost control
• 12 doors of Deli Reach-ins use Dixcell case controllers for temp/off cycle defrost control
• Deli walk-in is controlled with a t-stat, LLSV and time clock
• ACORN Unit is being used for condensate. We used both ACORN and EVAC valve stations
• Leak detection in walk-ins and at rack

• A Hussmann Rack with an E3 Controller and a Gutner Gas cooler was installed along with a Charge Saver Condensing Unit
• Danfoss 326 HPV and Ipro HPV Controllers piped were in parallel on rack and either can be used to operate system.
• Stepper and Pulse EEV’s were used along with an Emerson XM 678, XM679, Danfoss AK-CC55 and Copeland CC200 Case controllers at evaporator coils so students can get hands on experience with the common controls for CO2 systems
• CO2 Coils were added to the existing walk-ins and they now run off either system. MRLDS Leak detector horn/strobes added to both systems for training and safety.
• Drains, coils and gas cooler were added to the ACORN system; uses EVAC and ACORN Actuators.
• A heat reclaim coil was hung in the market area controlled by a 3-way valve located at rack