12 Product Manual WHR-2
Automatic circuit lead-lag
With the keypad, the operator can manually select either refrigerant circuit for the lead position or
the controller will automatically select the lead circuit based on the circuit with the fewest operating
hours.
Time clock, daily and holiday start/stop control
The operator can program daily start/stop schedules including weekends and up to fourteen
separate holidays without the need of an external time clock or EMS interface. If desired, an
external time clock can be used instead of the internal schedule.
Chilled water pump control
There is no need for an external time clock or EMS interface to control the pump start/stop
operation. The MicroTech chiller controller can accomplish this through a digital output. If an
alarm shuts down the chiller, the chilled water pump will remain on, providing any remaining cooling
to the loads.
Optional Network Master Panel
The MicroTech Network Master Panel (NMP) allows multiple reciprocating chiller controllers to be
incorporated into a building-wide network with other MicroTech units and auxiliary controllers. In
conjunction with a personal computer, it provides the building operator with the capability to
perform advanced equipment control and monitoring from a central or remote location. The
following features are provided by the optional NMP:
• Remote unit monitoring
• Advanced scheduling features
• Advanced alarm management features
• Global operator override
• Global unit shutdown input
• Demand metering
• Historical electrical data logging
Optional Remote Monitoring and Sequence Panel
One to three reciprocating chiller controllers can be incorporated into a network with the MicroTech
remote monitoring and sequencing (RMS) panel. The optional RMS panel provides the following
features:
• Remote chiller monitoring (up to 3)
• Automatic or manual chiller sequencing
• Automatic or manual lead-lag designation
• Common chiller scheduling
• Optimal start control
• Chilled water reset by outdoor air temperature or external 4-20 mA signal
• Chiller run time totalization by month, current year, and prior year
• Cooling degree-day totalization by month, current year, and prior year
The RMS panel is equipped with a keypad/display that is identical to the chiller controller’s
keypad/display. With a special keystroke combination, the RMS keypad/display can be interfaced
with any chiller controller. It then operates identical to the chiller-mounted keypad/display. Thus
the operator has full access to all networked chillers from a single remote location. Panel-mounted
LED’s clearly indicate which controller the RMS panel keypad/display is currently interfaced with.
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