Each McQuay Enfinity R-410A and standard R-22 horizontal
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
®
(LonTalk
®
or LonMark
®
3.3) 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 conditions 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 742 / Page 13
MicroTech™ 2000 WSHP Unit Controller
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
indicating 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.
MicroTech 2000
™
WSHP unit controller
MicroTech 2000
™
WSHP unit control box
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