Cruisair TWLC User Manual
TWLC - Tempered Water Logic Controller
The Intelligent Control
Chiller Controls
TWLC
Tempered Water
Logic Control
Features:
• Up to six (6) stages: individual board
for each stage maximizes redundancy.
• Menu driven access and programming.
• Fault history.
• Up to 14 inputs.
• Connect to on-board computer.
• Fully automatic temperature staging
and chiller rotation.
• New for 2009!
Latest firmware revision V40 has new
features and improved chiller
protection.
• Microprocessor controlled
• Same reliability as the SMX logic boards
• Chiller boards can be networked together
• Only one keypad needed to control up to six chiller units.
• Additional keypads can be added up to the number of units in
the system.
• Up to six heat and cool temperature set point stages
• Easy to use display keypad with menu-driven screens
Features
• Capable of operating immersion heaters with high limit protection
• Automatic compressor stage rotation to achieve even run-time
• Automatic start up time delay on compressors
• Ability to monitor the control system locally or remotely via a
computer, a modem, and a dedicated phone line
• Complete system fault logs with run time reference
• If network is lost, each chiller operates independently
• When replacing a board, an initializing routine automatically
integrates the new board into the system
Features (cont’d.)
• Removable terminal strips - ease of board replacement
• Removable EPROM – software upgrade
• Two LED’s - indicate network cable integrity
• One display keypad hook up
• One serial port connection for computer or modem hook up for
local or remote monitoring
• Six outputs:
• Compressor
• Reversing Valve
• Circulating pump
• Seawater pump
• Immersion Heat
• Fault warning (for external alarm, i.e. light or buzzer)
The Board (features and outputs)
TWLC Power Logic Board
Removable Terminal Strip
Removable E-Prom
Display cable
Jack
Computer or
Modem Jack
Network cable
Jacks
CNP Cable
CXP Cable
Cables Used To Connect TWLC Control And
Circuit Boards
Use to connect keypad in same enclosure and network connections between boards
Use to connect remote mounted keypad to circuit board
The Board (inputs)
The board contains 16 inputs
• Common loop water return temperature sensor
• Loop water out temperature sensor
• Sea water out temperature sensor
• Flow switch
• Discharge pressure switch/transducer -Automatically recognizable
• Suction pressure switch/transducer - Automatically recognizable
• Compressor current transducer
• Common loop water supply temperature sensor
Inputs (Cont’d.)
• Immersion heater loop water temperature sensor
• Common sea water in temperature sensor
• Sea water pump current transducer
• Loop water pump current transducer
• Loop water pressure transducer
• Sea water pressure transducer
• Two additional auxiliary inputs – future enhancements
The Board (inputs) cont’d.
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