Emerson E2 Manuel D’Utilisation

Walk-In Box freezers are often equipped with door 

switches that disable the evaporators when the door is 
open. The E2 is capable of reading a digital door switch 
input and controlling the freezer appropriately.

When a door switch opens, the E2 will shut off the 

refrigeration solenoid and the fans (if active) and turn the 
lights ON.

A circuit’s circulation fan is always ON when the cir-

cuit is in refrigeration mode. Its state during defrost is 
determined entirely by how the application is programmed 
by the user. You may choose to set the fan either ON or 
OFF for each phase of a defrost cycle (Pump Down, 
Defrost, and Run Off). If you choose to keep fans off for 
the entire defrost cycle, you may also choose to program a 
delay that will keep the fan from activating for a fixed 
amount of time after the cycle ends.

Fans are locked OFF during clean mode.

11.3.5 The TD3 Temperature 
Display

The TD3 is a case display that is designed to monitor 

three types of temperature sensors. The compact unit is 
mounted on the face of a refrigeration case and displays, 
by default, the discharge air temperature. Pressing the 
function button repeatedly allows you to view the tem-
perature of EmersoRetail Solutions’ product probe, the 
defrost termination value, and then back to the discharge 
air temperature.

The TD3 has a status light that is controlled by the E2 

controller. A green status light means that the status is 
okay while a red status light indicates alarm.

This case display can be configured to show either the 

discharge air temperature (default), the product probe tem-
perature, or the defrost termination temperature.

The TD3 communicates with the E2 controller via the 

Echelon Network and in turn the E2 adjusts the circuit’s 
temperature or defrost status.

The Control Link CD is mounted inside the refrigera-

tion case and serves as a point to which the sensors are 
wired. A single RS485 communication cable links the case 
display back to the E2 controller. Additionally, an optional 
remote display can be added to the control module to pro-
vide a local indication of case temperature and operational 
mode that is remote from the control module.

Wiring a case circuit so that it may be controlled by a 

Standard Circuit application primarily involves wiring all 
temperature sensors to 16AI Analog Input Boards and wir-
ing the valves and other devices on the case to a relay out-
put board such as an 8RO Relay Output Board. 

Figure 11-5 shows a typical case in a circuit and the 

devices that must be wired for each. Follow the guidelines 
below to wire the circuit to the E2 I/O Network: