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 L
on
W
orks
®
(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