©2025 Copeland LP.
026-1803 R13 Supervisor I&O User Guide 9 - 52
9.38.2 Case Circuit Control Software
Overview
There are six different versions of case control software in the
Copeland case control family:
• CC-100P - This version controls temperature in a case
using a pulse modulated valve, which is pulsed ON for a
percentage of a fixed amount of time to achieve the
necessary refrigerant flow.
• CC-100LS - This version controls temperature in a case
using a liquid-side stepper valve. This valve is capable of
various positions in between 0% and 100%. As a result,
the CC-100 is capable of supplying the exact refrigerant
flow necessary to achieve the case setpoint.
• CC-100H - This version controls temperature in a case
using a suction-side evaporator pressure
regulator (EEPR). This valve is capable of various
positions in between 0% and 100%. As a result, the CC-
100 is capable of providing the exact suction pressure
necessary to achieve the case setpoint.
• CS-100 - This controller uses suction-side evaporator
suction regulators (ESRs) to control suction pressure for
an entire circuit. Unlike the CC-100, which controls only
one case, the CS-100 controls all cases on an entire
circuit.
• EC-2s - The EC-2 is a liquid-side pulse valve case
controller that doubles as a case temperature and
information display. Unlike the CC-100, it is designed to
be mounted on the front of the case, and has a push-
button front panel interface for programming and
viewing status. (The EC-2 29x version controls the
refrigeration solenoid valve to allow the passage of
refrigerant to the TXV valve, whereas the 39x version
controls a pulse valve on the liquid side of the evaporator
to regulate superheat.)
• CCBs - An I/O Network-based controller used
primarily in old RMCC installations. Like the CC-100
family, the CCB was available in several different models
that controlled liquid pulse, liquid stepper, suction
stepper, and suction lineup.
9.38.2.1 Valve Control
The CC-100 is capable of supporting two types of valves:
pulse and stepper. The CC-100 uses PID control to vary the
aperture rates of both valves between 0% and 100% as
required by their temperature control algorithms
(see Section 9.38.3, below).
Pulse Valves
A pulse valve is a device capable of being in only two states:
fully open or fully closed. To achieve the necessary
percentage of refrigerant flow, CC-100s repeatedly “pulse”
these valves open for a percentage of an interval called the
valve period (which defaults to six seconds).
For example, to achieve a 20% valve output in a CC-100 with
a valve period of six seconds, a pulse valve would be opened
for 20% of six seconds (or 1.2 seconds) and closed for the
remaining 80% of the valve period (4.6 seconds). This same
six-second sequence will repeat for as long as the CC-100
calls for a 20% valve output.
Stepper Valves
Stepper valves are devices that may opened to many
different positions between fully closed (0%) and fully open
(100%). Stepper valves usually have hundreds or thousands
of “steps” in between fully closed and fully open. To achieve
the desired opening percentage, the CC-100 moves the
valve the required number of steps.
To properly control a stepper valve, the CC-100 must know
the operating characteristics of the valve, such as its
maximum steps per second change rate, the total number of
steps between 0% and 100%, and its hysteresis rate (the
number of steps required for the valve to change direction).
9.38.3 Refrigeration Control
9.38.3.1 EEVs (Liquid Pulse and Liquid
Stepper)
In CC-100P, CC-100LS, EC2, and CCB (liquid and pulse
stepper) case controllers, there are two different control
systems that work together to regulate refrigeration:
temperature control and superheat control.
Temperature Control
Temperature Control measures the case temperature and
turns refrigeration ON or OFF as required to keep the case
within a certain proximity of the user-specified temperature
setpoint.
NOTE
NOTE: There are several variations of the EC-2.
Contact Copeland at 833-409-7505 for more
information.
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