4
OM
AGSB-5
MicroTech II
™
Features
•
Control of leaving chilled water within a
±
0.2°F (
±
0.1°C) tolerance.
•
Readout of the following temperature and pressure readings:
•
Entering and leaving chilled water temperature.
•
Saturated evaporator refrigerant temperature and pressure.
•
Saturated condenser temperature and pressure.
•
Outside air temperature.
•
Suction line, liquid line, and discharge line temperatures
−
calculated superheat for
discharge and suction lines
−
calculated subcooling for liquid line.
•
Automatic control of primary and standby chilled water pumps. The control will start one
of the pumps (based on lowest run-hours) when the unit is enabled to run (not necessarily
running on a call for cooling) and when the ambient temperature reaches a point of freeze
possibility.
•
Two levels of security protection against unauthorized changing of setpoints and other
control parameters.
•
Warning and fault diagnostics to inform operators of warning and fault conditions in plain
language. All events, alarms, and faults are time- and date-stamped, for identification of
when the fault condition occurred. In addition, the operating conditions that existed just
prior to shutdown can be recalled to aid in isolating the cause of the problem.
•
Twenty-five previous alarms and related operating conditions are available.
•
Remote input signals for chilled water reset, demand limiting, and unit enable.
•
Manual control mode allows the service technician to command the unit to different
operating states. This function can be useful for system checkout.
•
Building Automation System (BAS) communication capability via L
ON
W
ORKS
®
,
Modbus
®
, or BACnet
®
standard protocols for all BAS manufacturers-simplified with
McQuay’s Protocol Selectability
™
feature.
•
Service Test mode for troubleshooting controller hardware.
•
Pressure transducers for direct reading of system pressures. Preemptive control of low
evaporator pressure conditions and high discharge temperature and pressure to take
corrective action prior to a fault trip.
Summary of Contents for AGS 206A
Page 65: ......
