McQuay AGZ 030AM, Руководство по эксплуатации продукта

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40 AGZ 030A through 065A Product Manual AGZ-2
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.
Phase Loss/Voltage Protection
Phase loss with under/over voltage protection and multiple LED indication of fault type is available as
a factory installed option to guard against compressor motor burnout.
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 safety switch. If this option is not ordered with the unit, then a field
supplied water flow switch is required.
Vibration Isolators
Spring vibration isolators are available for field installation to reduce vibration transmission through
the unit base. The spring flex isolators are white type CP2-32, McQuay part number 047792932. A
total of four per unit is required.
Zone Terminal Display
An accessory to the standard Global UNT controller that provides:
•
Chilled water reset
•
Low ambient lockout
•
Outside air reset
•
Demand Limit
•
Ability to monitor and/or adjust 32 points
See page 7 for a complete description. (Not available on MicroTech option.)
MicroTech
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 setpoints can be
changed.
MicroTech continuously performs self-diagnostic checks and will automatically shutdown a
compressor, a refrigerant circuit, or the entire unit should a fault occur. The cause of the shutdown
will be retained in memory and can easily be displayed for operator review. The MicroTech controller
will also retain and display the time the fault occurred and the operating conditions that were present at
the time of the fault. In addition to alarm diagnostics, the controller also provides the operator with a
warning of pre-alarm conditions.
Personal Computer Monitoring
MicroTech Monitor software may be used on the customer's personal computer to communicate with
the MicroTech controller. The controller connects directly or remotely over phone lines with an
optional modem.
Dual Setpoint Control
(Ice Storage Applications)
Factory supplied with microprocessor based dual setpoint control. A field supplied time clock will
determine whether the chiller operates in normal or ice mode.
Cycle Counter and Run Hour Meter
Factory installed keypad selectable cycle counters and hour meters are available for each compressor.