The Emerson E2 (and its CPC predecessor before the 2015 brand consolidation) controls a large fraction of Tampa Bay supermarket racks installed between 2005 and 2018. Many are still in service, and the upgrade decision is real — older E2 hardware is approaching end-of-support.
Three E2 generations matter: CPC E2-RX (refrigeration controller, pre-2015), CPC E2-BX (building/HVAC), and the post-Emerson-rebrand Emerson E2 running newer firmware on the same hardware family. UltraSite and Site Supervisor are the legacy and current management interfaces. The E2 is being replaced in Emerson's roadmap by the Emerson Site Supervisor (rebranded next-gen platform).
E2 has a 4×40 character LCD display on the front and a separate keypad. From the home screen the menu hierarchy is: F1 (Main Menu) → screens for Suction Groups, Condensers, Circuits, Cases, Inputs, Outputs, Alarms, Logging. UltraSite or Site Supervisor over Ethernet provides a graphical interface and is what most techs actually use on the floor — the front panel is functional but slow.
Default username: USER, password: PASS at most installs. For Engineer-level access, password is set during commissioning and lives in the rack documentation binder.
Main Menu → Suction Groups → select group → status screen shows live suction pressure, target setpoint, current cut-in/cut-out, individual compressor states, and run hours. The E2 staging logic uses a step-up / step-down algorithm rather than a true PI controller — visible as discrete capacity steps rather than smooth modulation.
Main Menu → Defrost → schedule view shows each circuit's defrost frequency, duration, and termination temperature. Defrost history (last 8 cycles per circuit) is in Logging. Common diagnostic: a circuit terminating on TIME instead of TEMP indicates a defrost termination probe or heater problem, same as on the Danfoss platform.
E2 alarms use plain-text descriptions rather than coded numbers, which is helpful: "Case Temp High," "Comp Lockout," "Suction Press Trans Fail," etc. Critical alarms route via the alarm priorities configured in System Configuration → Alarms — confirm these are configured to actually escalate before you assume the silence means everything is fine.
Emerson announced limited support for legacy E2 hardware in 2024 — parts availability is degrading, and major firmware updates are no longer being released. New CPC E2 hardware purchase is no longer practical for new installs; existing installs continue working but with degrading parts availability.
The Emerson upgrade path is to Site Supervisor on new hardware, which is a full controller replacement, not a firmware update. Cost runs $25K–$50K installed for a typical Tampa Bay supermarket depending on case controller compatibility.
Some operators are replacing legacy E2 with Danfoss AK-SM at controller end-of-life rather than staying with the Emerson roadmap. This requires re-mapping every case controller and re-commissioning the rack staging logic — typically a 2–4 day outage window if planned well, or a 1-week phased migration. Cost similar to the Emerson upgrade path, with the upside that Danfoss case controllers (AK-CC) are mainstream supply across the U.S. while CPC's legacy case controller (CC100) is parts-limited.
For stores with 5+ years of operational life left and good E2 hardware, a stay-the-course strategy is reasonable: update Site Supervisor software annually, keep one spare E2 module of each type onsite, document parameters monthly, and budget for the platform upgrade in the 5-year capital plan. Emerson is committed to running legacy E2 stores indefinitely on existing hardware; they're just no longer selling new E2 controllers.
Yes for existing installs, but with degrading parts availability. Emerson is no longer releasing major firmware updates for the legacy E2 family and new E2 hardware is no longer available — the roadmap upgrade is to Emerson Site Supervisor, which is a full controller replacement.
Same hardware family. CPC was the original brand before Emerson consolidated the product line in 2015. Most pre-2015 supermarket installs label it CPC; post-2015 installs and replacement parts use the Emerson brand. Configuration and operation are essentially identical.
It depends on the case controller inventory. If your cases use Emerson CC100 case controllers, the Site Supervisor upgrade keeps that ecosystem; if you have mixed or third-party case controllers, switching to Danfoss AK-SM with AK-CC case controllers is often cleaner long-term.
From the front panel: F1 (Main Menu) → Suction Groups → select group → status. From Site Supervisor over Ethernet: Refrigeration → Suction Groups view. Both show live SP, setpoint, individual compressor states, and run hours.
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The dominant facility controller on newer Tampa Bay racks.
When to keep a legacy E2 install and when to replace.
Controller upgrade math vs other grocery energy projects.