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Echelon Network Boards and Peripherals Hardware Overview • 2-11
2.3.3 EC-2s
Figure 2-20 - EC-2
The EC-2 is an advanced refrigerated case controller
that doubles as a temperature and case status indicator.
During refrigeration and defrost, the EC-2 controls most
typical case functions, including fans, defrost, and a pulse
valve on the liquid side of the evaporator to regulate super-
heat.
The EC-2 29x version controls the refrigeration
sole-
noid valve to allow the passage of
refrigerant to the TXV
valve. The EC-2 39x version controls a pulse valve on the
liquid side of the evaporator to regulate Superheat control.
The EC-2 relies on a parent E2 to handle logging,
alarm
control, defrost scheduling, and other case control
functions.
The EC-2 is designed to be mounted on the front of a
refrigerated case. The
LED display shows the current case
temperature with one-tenths of a degree's accuracy. The
display can also show alarm codes to immediately notify
floor managers of alarms and notices. Other lights on the
display show the ON/OFF status of refrigeration, defrost,
and fans.
The EC-2 can be easily programmed using either the
fo
ur front-panel buttons or an optional infrared remote
control. For security, the buttons can be disabled to pre-
vent tampering.
NOTE: There are several variations of the
EC-2. Contact Emerson Ret
ail Solutions at 1-
800-829-2724 for more information.
2.3.4 CC-100 Case Controllers and
CS-100 Case Circuit Controllers
A CC-100 case control board is a “smart” board capa-
ble of controlling all functions for
a single case, including
lights, fans, defrost, anti-sweat, and suction side or liquid
side valve control. CC-100s perform these functions inde-
pendently from the E2 RX controllers, b
ut it does rely on a
parent E2 for logging, alarming, providing supplemental I/
O values, and coordinating defrost times among circuits.
There are four different models of the CC-100, each of
wh
ich controls a different type of valve.
1. CC
-100P (P/N 810-3160)— Case controller for
liquid-side pulse valves (also called electronic
expansion valves, or EEVs). This model is capa-
ble of controlling up to two pulse valves simulta-
neously (for use in dual-evaporator applications
such as
walk-in boxes).
2. CC
-100LS (P/N 810-3170) — Case controller for
liquid-side stepper valves (EEVs).
3. CS-1
00 (P/N 810-3177) — Case circuit controller
for suction-side stepper valves (also called elec-
tronic evaporator pressure regulat
ors, or EEPRs).
4. CC
-100H (P/N 810-3171)— A special version of
the CC-100 that is used by a particular manufac-
turer. This board controls temperature in
a case
using suction-side stepper valves that regulate
pressure in the evaporator.
The CC-100/CS-100 board is shown in Figure 2-21.
Figure 2-21 - Case Controller (CC-100P shown)