Product Manual ALR2-3 ALR 110F – 150F 49
3. Resetting chilled water temperature by either controlling the return water
temperature or by a remote 4-20mA DC signal.
4. A soft load function to prevent the system from operating at full load
during the chilled water pulldown period.
5. An electronic time clock to allow programming of a yearly schedule
accommodating weekends and holidays.
6. Auto restart after a power failure, not requiring external battery back-up or
auxiliary power for maintaining program memory.
7. Safety shutdowns shall be date and time stamped with system
temperatures and pressures recorded. A minimum of six previous
occurrences shall be kept in a revolving memory.
8. Start-to-start and stop-to-start timers to provide minimum compressor off-
time with maximum motor protection.
9. Capability of communication with a PC or remote monitoring through a
twisted pair RS-232 interface.
10. Lead-lag by manual selection or automatically by minimum circuit run
hours.
11. Discharge pressure control through intelligent cycling of condenser fans.
12. Continuous diagnostic checks of unit operation to provide a pre-alarm
signal in advance of a shutdown allowing time for remedial action to be
taken.
2.05 OPTIONS AND ACCESSORIES
The following options are to be included:
• Part winding start
• Three phase power loss with under and over voltage protection
• Refrigerant and oil pressure gauges
• High return water thermostat to keep compressor unloaded with high startup water
temperatures. Contractor to field mount sensor and field wire to control panel.
• High ambient unloader to unload compressor at pressures above 375 psig (2586 kPa)
• Hot gas bypass on all circuits
• Low ambient head pressure control to 0°F (-17.8°C)
• Copper fin condenser coils
• ElectroFin™ coated coils
• Chilled water flow switch to be field mounted in the chilled water line by the contractor
and field wired to terminals in the control panel.
• Spring vibration isolators for field installation
• Disconnect switch with through-the-door handle
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