10 |
P a g e
4.3
Controller features
1.
Display following temperature and pressure readings:
i.
Entering and leaving chilled water temperature
ii.
Saturated evaporator refrigerant temperature and pressure
iii.
Saturated condenser refrigerant temperature and pressure
iv.
Suction line, and discharge line temperatures – calculated superheat for
suction and discharge lines
2.
Unit and system status display.
3.
Selectable leaving or entering water temperature control based on application.
4.
EXV auto control using suction superheat.
5.
Condenser fans control based on condenser pressure.
6.
Three levels of security password protection against unauthorized changing of setpoint
and other control parameters.
7.
Pre-emptive control for low evaporator pressure and high condenser pressure condition
to take corrective action prior to fault trip.
8.
Alarm display to inform operators of warning and fault conditions. All events and
alarms are with time and date for identification of when the fault condition occurred.
9.
Alarm history display with time and date for identification.
10.
Test mode allows the service technician to manually control the controller’s output and
can be useful for system checkout
11.
Building Automation System (BAS) communication capability via Modbus and
BACnet standard protocols.
Summary of Contents for UAA-ST3M
Page 2: ......
