Product Manual ALR2-3 ALR 110F – 150F 43
Optional Features
Electrical
Part Winding Start (380V, 460V, 575V)
Part winding start is standard on 208V and 230V units and optional on 380V, 460V and 575V. It works
in conjunction with the unit's standard compressor sequence start timers to reduce current inrush by
providing two-step start of each compressor. This feature is not normally required on the McQuay
multiple compressor, sequence start design.
Disconnect Switch (Factory Installed)
A factory installed, service use, non-fused disconnect switch with an installed through-the-door
handle is available with single point power supply.
Disconnect Switch (Field Installed)
The disconnect switch is available as a field installed kit. In this case, the through-the-door handle is
ordered as a separate kit for field installation. Field installation requires modification to the control
panel door.
TEFC Motors
Totally enclosed fan motors are available as an option to the standard weather protected motors.
Phase Loss/Voltage Protection
Three levels of phase failure protection are available as a field installed option to guard against
compressor motor burnout: (1) phase loss with under voltage protection, (2) phase loss with
under/over voltage protection, and (3) phase loss with under/over voltage protection and multiple
LED indication of fault type.
115 Volt Convenience Outlet
The outlet is located in the main Control panel section. Meets most code requirements for a
convenience outlet located at or on the unit.
Multiple Point Wiring Connections
Special that provides separate power blocks for each of two circuits (two compressors each) and fan
motors, total of three connections.
Controls
Hot Gas Bypass
Hot gas bypass permits unit operation down to 10% of full load capacity. This factory installed option
includes a hot gas bypass valve, solenoid valve, and manual shutoff valve. Hot gas bypass is
provided on both refrigerant circuits with the standard lead-lag switch provided.
Gauges
Optional factory mounted gauges include high side and low side refrigerant gauges for each
refrigerant circuit as well as oil pressure gauges for each compressor.
High Return Water Unloader Thermostat (UNT Control Only)
Optional field installed high return temperature unloader thermostat senses high return water
temperatures at startup and keeps the compressors unloaded to avoid unit shutdown due to
compressor motor overload. Field location of the thermostat bulb is required.
SpeedTrol Head Pressure Control
Optional SpeedTrol head pressure control allows unit operation down to 0°F (-18°C) on all models.
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