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AGR 070A through 100A
Product Manual AGR-3
Optional Features
Electrical
Disconnect Switch
A factory or field installed non-fused disconnect switch with standard thru-the-door handle is available
on all units except AGR 080 and larger with 208/230 volt power.
Circuit Breakers
Factory installed circuit breakers are available on unit with single or multiple point power supply. This
option provides unit installed compressor short circuit protection and makes servicing easier.
Multiple Point Power Connections
Two separate power connections are furnished, one for each circuit's compressor and fan motors.
Part Winding Start
Part winding start is available as a special option on 380 – 575 volt units.
115 Volt Convenience Outlet
Meets most code requirements for a convenience outlet at or near the unit.
Controls
Hot Gas Bypass
Hot gas bypass permits unit operation down to 10% of full load capacity. This option includes a hot gas
bypass valve, solenoid valve, and manual shutoff valve for each circuit.
Gauges
Optional factory mounted gauges include high side and low side refrigerant gauges and oil pressure
gauge for each refrigerant circuit for units with the standard UNT controller. (The data is included on
the optional MicroTech control keypad display.)
High Return Water Staging Thermostat
Field installed high return temperature unloader thermostat senses high return water temperatures at
startup and unloads the refrigerant circuit to avoid unit shutdown due to compressor motor overload.
Field location of the thermostat bulb is also required. (Function is standard on the MicroTech.)
SpeedTrol Head Pressure Control
Optional SpeedTrol head pressure control allows unit operation down to 0°F (-18°C). (Not available on
380 volt - 60 Hertz units.) SpeedTrol includes a single-phase variable speed motor in the first fan
position for each system.
Water Flow Switch
A water flow switch is available for field installation in the chilled water piping to prevent evaporator
freeze-up under low or no flow conditions. Terminals are provided in the unit control center for field
hook-up of the water flow switch. If this option is not ordered with the unit, then a field supplied water
flow switch is required.
Zone Terminal Display
For use with the standard Global UNT controller. Can be field mounted on unit or remotely. See page
7 for details. (Not required on MicroTech option.)
MicroTech
(Required option with R-134a use)
The control panel contains a Model 250-6 microprocessor based controller. The operator can review
and change operating parameters from the interface keypad. The interface keypad has twelve input
keys and a two line by sixteen character display. The system is protected by a simple password scheme
allowing access to authorized personnel. A valid password must be entered before any set points can be
changed.