Specifications

Catalog 1114-1 SmartSource 2-Stage Water Source Heat Pumps Page 71 of 76
Engineering Guide Specications
MicroTech™IIIControlwithLonWorkscommunicationmodule– Unit shall have a microprocessor-based control
system. The unit control logic shall communicate over a LonMark communications network. The unit controller is factory
programmed [LonMark ® 3.4 certied Application Code the current standard for new applications] and tested with all the
logic required to monitor and control heating and cooling operation. The controller sets the unit mode of operation, monitors
water and air temperatures, and can communicate fault conditions via a LonMark communications network. Units with the
MicroTech III and LonWorks communication module include return air, discharge air and leaving water temperature sensors.
Space temperature sensor options include a set-point adjustment, tenant override button, and the capability of substituting the
return air sensor with a wall-mounted room sensor.
MicrotechIIIControlw/BACnetCommunicationmodule– Unit shall have a microprocessor-based control system. The
unit control logic shall communicate over a BACnet communications network. The BACnet communication module shall
incorporate an Atmel ARM7 Thumb series MCU and be capable of supporting a full MSTP BACnet implementation. The
microprocessor shall also support SPI compatible communications with the MCU of the Microtech III controller. The physi-
cal interface to a BACnet BAS network shall be through an industry standard RS-485 transceiver capable of existing on an
RS- 485 network of up to 64 nodes. The unit controller is factory programmed and tested with all the logic required to moni-
tor and control heating and cooling operation. The controller sets the unit mode of operation, monitors water and air tempera-
tures, and can communicate fault conditions via a BACnet communications network. Units outtted with Microtech III and
BACnet Communication modules include return air, discharge air and leaving water temperature sensors. Space temperature
sensor options include a set-point adjustment, tenant override button, and the capability of substituting the return air sensor
with a wall-mounted room temperature sensor.
Each communicating unit controller performs the following unit operations:
■ Enable heating and cooling to maintain space temperature set point at the room sensor
■ Enable fan and compressor operation
■ Monitor all safety controls
■ Monitor discharge and return air temperature
■ Monitor leaving water temperature
■ Relay status of all vital unit functions
■ Support optional control outputs
Unit mounted LED annunciators aid in diagnosing unit operation by indicating the water source heat pump operating mode
and alarm conditions. If there are no current alarm conditions, a green LED on the annunciator board will indicate normal
unit operating mode. If an alarm condition exists, the MicroTech III SmartSource unit controller will send the fault condition
to the LED annunciator, which will assist in troubleshooting the unit. Heat pumps with the MicroTech III SmartSource unit
controller with a LonWorks Communication Module is designed to be linked with a centralized Building Automation System
(BAS) through a LonMark communications network for centralized scheduling and management of multiple heat pumps.
Wall-mounted room sensors are available to control the heating and cooling operation of each MicroTech III Water Source
Heat Pump.
Warranty
• An optional 2, 4, or 10-year extended compressor warranty covers the compressor from the date at which the unit ships
from the factory.
• An optional 2, 4, or 10-year extended refrigeration circuit warranty covers the entire refrigeration circuit and related
components for 5 years.
Field Installed Accessories and Options
WallThermostats:
• Programmable Touch Screen Thermostat
1. Optional Remote Room Sensor
2. Optional Outdoor Temperature Sensor
• Non-Programmable Thermostat
1. Optional Remote Room Sensor
• Programmable Thermostat
1. Optional Remote Room Sensor