Emerson E2 operation manual Standard Circuits, Refrigeration Control

FAN

AMBIENT

TEMP

WATER
SPRAY
DISCHARGE		OUTLET
PRESSURE
	COIL	DAMPERS
INLET	WATER SUMP
	TEMPERATURE
W	MP
ATER SU
PUMP 1 PUMP 2
EVAPORATIVE
CONDENSER		26509038

Figure 11-3- Evaporative Condenser Diagram

Input	Sensor Type	Wiring
		Instructions
Discharge Pressure	500 lb. Eclipse	see Table 9-1 on
	transducer	page 9-3
Ambient Temp	Temperature	see Table 9-1 on
		page 9-3
Water Sump Temp	Temperature	see Table 9-1 on
(Evap. only)	(Immersion)	page 9-3
Override Temp Sen-	Temperature	see Table 9-1 on
sors (Evap. only)	(Pipe-Mount)	page 9-3

Table 11-3- Suction Group Inputs

	Wire Output	Set Fail-safe Dip
Output Device	Board Contacts		Notes
	to:	Switch to:
Condenser Fan	N.C.	N.C. (up)	To ensure condensing during network and power failure, con-
(Single-Speed)			denser fans should all be configured normally closed (N.C.)
Condenser Fan	N.C.	N.C. (up)	The fan should operate at 100% during loss of communication
Relay (Variable-			with E2.
Speed)
Dampers (Evap.	N.C.	N.C. (up)	Dampers should be open during communication loss (N.C.).
only)
Evaporator Pumps	N.C. (see note)	N.C. (see note)	Some condensers have dual pumps that cycle at even intervals.
(Evap. only)			One pump should be wired N.C. and the other N.O., so that only
			one pump runs during communication loss.
Variable-Speed Fan	None (analog point)	None (analog point)	This 4AO or 8IO analog point sends the 0-100% fan speed sig-
Output (to inverter)			nal to the inverter.

Table 11-4- Suction Group Outputs

11.3 Standard Circuits

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.

NOTE: Do not set up a Standard Circuit appli- cation for a case that uses a CC-100 or CCB case controller. These cases must use Case Cir-

cuit Control applications (see Section 11.4, Case Con- trol Circuits).

11.3.1 Refrigeration Control

A Standard Circuit application may apply one of four different control methods to a case circuit: the Tempera- ture Monitor method, the Temperature Control method,

Standard Circuits Software Overview • 11-5