Johnson Controls L-Series, Engineering Manual

Page: 7 / 82

FORM 145.05-EG2 (618)
JOHNSON CONTROLS 7
STANDARD FEATURES
Controls
• Microprocessor based control system proven algorithms.
• Large 32-key operator interface with large display, in clear language, accessible
without opening panel.
• Alarms and faults displayed and stored in the controller memory.
• Occupied and Unoccupied mode operation.
• Timed Override operation.
•
Supply airflow proving switch.
• Condensing pressure control when condenser valves are present.
• All refrigerant controls like thermostatic expansion valves, sight glass are out of the
air stream and adjustable while unit is working.
• ETL and CETL listing for US and Canada.
Refrigerant Circuits
• Multiple scroll compressors for better temperature control. Up to six compressors.
• All compressors have independent refrigerant circuits and independent short circuit
protection.
• Automatic compressor lead-lag on units larger than 40 tons.
• Environmentally friendly R-410A refrigerant.
• Completely factory piped, charged, and protected refrigerant circuits.
• Each refrigerant circuit with suction and discharge pressure transducers for enhanced
diagnostics and control.
• Evaporator coil frost protection
• Mechanically cleanable shell and tube condenser, factory tested and piped.
• Factory leak and pressure tested refrigerant piping
• Low ambient compressor lockout.
Supply Fan
• Plenum fan with backward inclined airfoil blades provides required airflow at lower
energy consumption and sound compared to the most competitive units.
• Minimum class II fans for high static requirements. Class III fans available.
• Supply fan and motor assembly is isolated with springs to minimize the vibration and
sound transmission to the rest of the unit and beyond.
• Bearing lubrication line brought to one location for easy maintenance.