Each McQuay Enfinity vertical water source heat pump can
be equipped with a MicroTech 2000 water source heat pump
unit controller. The controller is microprocessor-based and is
designed to communicate over a LonWorks communica-
tions network. The unit controller is factory programmed and
tested with all the logic required to monitor and control the
unit. The controller sets the unit mode of operation, monitors
water and air temperatures, and can communicate fault con-
ditions to a LonWorks communications network.
The MicroTech 2000 unit controllers include unit-mounted
return air, discharge air and leaving water temperature sen-
sors. Options include a tenant setpoint adjustment knob and
tenant override button, and the capability of substituting the
return air sensor with a wall-mounted room sensor.
Each unit controller orchestrates the following unit
operations:
●
Enable heating and cooling to maintain setpoint based on
a room sensor.
●
Enable fan and compressor operation.
●
Monitor all safety controls.
●
Monitor discharge air temperature.
●
Monitor leaving water temperature.
●
Relay status of all vital unit functions.
●
Support optional control outputs.
IM 778 / Page 13
MicroTech™ 2000 WSHP Unit Controller
Figure 16. MicroTech 2000 Unit Controller LED Indication
Status LED State
Mode
On Continually
Occupied, Occupied Load
Shed
On 1⁄2 sec., Off 5 1⁄2 sec.
Unoccupied
On 5 1⁄2 sec., Off 1⁄2 sec.
Tenant Override, Override
Load Shed
Flashing
Alarm Condition
An amber, on-board status LED aids in diagnostics by indi-
cating the water source heat pump operating mode and
alarm conditions. If there are no current alarm conditions,
the LED will indicate the unit operating mode as shown in
the table below. If there are one or more alarm conditions
present, the LED will flash to indicate an alarm condition.
MicroTech 2000 heat pumps are designed to be linked with
a centralized building automation system through a
LonWorks communications network for centralized schedul-
ing and management of multiple heat pumps. Wall-mounted
room sensors are available to control the heating and cool-
ing operation of each MicroTech 2000 Water Source Heat
Pump Unit Controller. Available room sensors include: room
sensor with LED status and tenant override button, room
sensor with LED status, timed-override button, and bi-metal
thermostat, room sensor with LED status, timed-override
button, and setpoint adjustment, and room sensor with LED
status, timed-override button, setpoint adjustment and bi-
metal thermostat.
Figure 15. MicroTech 2000
™
WSHP unit controller
Figure 17. MicroTech 2000
™
WSHP unit control box
