Standard Circuits; Refrigeration Control - Emerson E2 Installation And Operation Manual

AMBIENT
TEMP
DISCHARGE
PRESSURE
INLET
PUMP 1 PUMP 2
EVAPORATIVE
CONDENSER
Figure 11-3
- Evaporative Condenser Diagram
Wire Output
Output Device Board Contacts
Condenser Fan N.C.
(Single-Speed)
Condenser Fan N.C.
Relay (Variable-
Speed)
Dampers (Evap. N.C.
only)
Evaporator Pumps N.C. (see note)
(Evap. only)
Variable-Speed Fan None (analog point)
Output (to 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.
Standard Circuits
FAN
WATER
SPRAY
OUTLET
COIL
WATER SUMP
TEMPERATURE
R
26509038
Set Fail-safe Dip
Switch to:
to:
N.C. (up)
N.C. (up)
N.C. (up)
N.C. (see note)
None (analog point) This 4AO or 8IO analog point sends the 0-100% fan speed sig-
Input Sensor Type
Discharge Pressure 500 lb. Eclipse
transducer
Ambient Temp Temperature
Water Sump Temp Temperature
(Evap. only) (Immersion)
Override Temp Sen- Temperature
sors (Evap. only) (Pipe-Mount)
Table 11-3
- Suction Group Inputs
Notes
To ensure condensing during network and power failure, con-
denser fans should all be configured normally closed (N.C.)
The fan should operate at 100% during loss of communication
with E2.
Dampers should be open during communication loss (N.C.).
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.
nal to the inverter.
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,
Wiring
Instructions
see Table 9-1 on
page 9-3
see Table 9-1 on
page 9-3
see Table 9-1 on
page 9-3
see Table 9-1 on
page 9-3
• -
Software Overview 11 5