CP6, CP7, or CP8: Series Programmable Controller
Version 1.0
ABOUT THE CP6, CP7, AND CP8
The CP6, CP7, and CP8 are a new programmable controller based on a 16-bit microprocessor designed for
Nor-Lake Inc. Scientific control panels. The control panels are made up of a microprocessor-based MAIN
BOARD equipped with a set of terminals used to connect the board to the controlled devices (i.e.: valves,
lights, fans, and humidification, alarm triggers). The program and the parameters are saved permanently in
the FLASH memory, preventing data loss in the event of power failure (with-out requiring a backup battery).
The control panel also includes a microprocessor-based TERMINAL unit complete with display, keypad and
led indicators allowing you to easily set the main control parameters (set-points, bands, alarm thresholds) and
carry out the main working operations (on/off, displaying controlled variables). Connection between the
terminal unit and main board is necessary only when programming the control panels’ basic parameters.
The basic sequence of operation is:
CP6 - on/off control using a pump down solenoid
CP7 and CP8 - cooling and heating using hot gas bypass using either a solenoid or by a proportional
modulating electronic valve
CP8 - activate the humidifier as needed when the humidity falls below the set point
CP8 - activate the dehumidifier as needed when the humidity exceeds set point
Dual mode defrost timer; Time initiated –Time terminated or Time initiated –Temperature terminated
In addition to the basic sequence of operation, optional features are available:
two display options using LED and Graphical displays
networking to a central command computer, or to an existing building automation system
monitor the sensors, compressors and heaters for failure. On a sensor failure, the applicable systems are
disabled. On a compressor failure by low or high pressure, the compressor is locked out and other
compressors substituted. On a heater failure the heaters are locked out, but automatically reset.
multi channels of on/off light control
day/night settings for Temperature and Humidity
redundant system operation of two units with automatic crossover
The CP6, CP7, and CP8’s are truly one of the most powerful and flexible controllers available today.
SENSOR LOCATION
The location of the sensors is very important. All sensors should be positioned away from electromagnetic
noise. The product temperature sensor should be immersed in glycerin or other suitable medium that
thermally simulates the product. The glycerin well/product sensor is normally mounted on the wall near the
door and should be mounted at a height that will best reflect the product storage height, normally 40” above
the floor. For optimum temperature control the air temperature sensor should be mounted at a location, out of
the direct discharge of the evaporator coil, that best reflects the median temperature of the room. If the sensor
lead is not long enough, the lead may be extended using 18 gauge wire. The humidity sensor (CP8 Series)
should be mounted at a height that will best reflect the product storage height, normally 40” above the floor.
It is critical that the humidity sensor is located out of any direct air stream or discharge from devices;
evaporators, door openings, humidifiers, dehumidifiers, heat from lights, etc. If the sensor lead is not long
enough, the lead may be extended using 18 gauge wire. After the sensors are mounted, seal the hole in the
wall where the leads were fed with silicone sealant to prevent airflow through the hole.
