Product Manual WHR-2 11
Operator-friendly
The 12-key, touch-sensitive, membrane keypad and 32-character display makes the MicroTech
system especially user-friendly. Inch-pound or SI units are optionally available.
The MicroTech menu structure is separated into three distinct categories, which provide the
operator or service technician with a full description of current unit status, control parameters, and
alarms. Security protection prevents unauthorized changing of the setpoints and control
parameters.
MicroTech continuously performs self-diagnostic checks, monitoring all system temperatures,
pressures and safeties, and will automatically shutdown a compressor, a refrigerant circuit of the
entire unit should a fault occur. The cause of the shutdown will be retained in memory and can be
easily displayed in plain English or metric units for operator review. The MicroTech chiller
controller can also retain and display the time the fault occurred and the operating conditions that
were present at the time of the fault, which is an extremely useful feature for troubleshooting. In
addition to displaying alarm diagnostics, the MicroTech chiller controller also provides the operator
with a warning of pre-alarm conditions.
Ice storage
The MicroTech control easily changes the leaving fluid setpoint via a remote signal to the
controller. The feature enables selection of chilled water or ice storage mode.
Enhanced chiller operating efficiencies
The MicroTech chiller controller offers many features to improve the operating efficiency of the
reciprocating chiller. In addition to monitoring water temperature and air temperatures, refrigerant
temperatures and pressures, and unit amperage, MicroTech also offers the following energy saving
features:
Programmable setpoints
The MicroTech chiller controller offers precise digital settings of the leaving chilled water
temperature setpoint and all other control parameters. This is extremely important in the setting of
safeties such as low leaving water temperature cutout, high pressure cutout, suction pressure
cutout, and freeze protection.
Compressor soft loading
Soft loading limits the number of cooling stages to prevent unnecessary electrical demand and
possible overshoot of the leaving chilled water temperature setpoint.
Demand limit control
Based on a 4-20mA DC signal, the controller will determine the maximum number of stages permitted
to operate, preventing additional demand charges during high usage periods.
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