Emerson E2 Manuel D’Utilisation

EVAPORATIVE

CONDENSER

PUMP 2

PUMP 1

WATER
SPRAY

FAN

INLET

OUTLET

DAM

PERS

DISCHARGE
PRESSURE

COIL

WATER SUMP
TEMPERATURE

26509038

AMBIENT
TEMP

WATER SUMP

Discharge Pressure

500 lb. Eclipse 
transducer

Ambient Temp

Temperature

Water Sump Temp 
(Evap. only)

Temperature 
(Immersion)

Override Temp Sen-
sors (Evap. only)

Temperature 
(Pipe-Mount)

Condenser Fan 
(Single-Speed)

N.C. 

N.C. (up)

To ensure condensing during network and power failure, 
condenser fans should all be configured normally closed 
(N.C.)

Condenser Fan 
Relay (Variable-
Speed)

N.C.

N.C. (up)

The fan should operate at 100% during loss of communi-
cation with E2. 

Dampers (Evap. 
only)

N.C.

N.C. (up)

Dampers should be open during communication loss 
(N.C.).

Evaporator 
Pumps (Evap. 
only)

N.C. (see note)

N.C. (see note)

Some condensers have dual pumps that cycle at even 
intervals. One pump should be wired N.C. and the other 
N.O., so that only one pump runs during communication 
loss.

Variable-Speed 
Fan Output (to 
inverter)

None (analog 
point)

None (analog 
point)

This 4AO or 8IO analog point sends the 0-100% fan 
speed signal to the inverter.

Refrigerated cases that do not use case controllers are 

controlled by Standard Circuit applications. In a Standard 
Circuit application, the E2 is responsible for all case mon-
itoring and control; it uses the RS485 I/O Network to both 
gather case temperature inputs and activate or deactivate 
the liquid line solenoids, defrost modes, and fans. Also, 
circuits that use ESR8s and MultiFlex ESRs are controlled 
using Standard Circuits.