Cost-effective building integration solutions
McQuay Rooftop and SelfContained Air-Conditioning
Systems Feature MicroTech II™
Controllers with Protocol
McQuay’s new MicroTech II™ unit controllers feature
powerful DDC technology with Protocol Selectability™ for
easy integration into your building automation system (BAS)
of choice.
• Easy, low-cost integration into most building automation
• You select either BACnet® or LONWORKS® communications to communicate control and monitoring
information to your BAS, without the need for costly
gateways. Units are LONMARK® certified with the
appropriate communication module for LONWORKS®
• Factory integrated and tested controller, sensors, actuators
and unit options promote quick, reliable start-up and
minimize costly field commissioning.
• Detailed equipment status information is available to your
BAS regardless of protocol.
• Flexible BAS network communication options for the life
of your McQuay equipment.
Integrated Capabilities
MicroTech II Controls:
• For ASHRAE Standard 62.1-2001 Compliance – McQuay
applied rooftop and self-contained units with MicroTech II
controllers communicate with your BAS to provide proper
building ventilation control. McQuay’s exclusive
DesignFlow™ precision outdoor air measurement system
and SuperMod™ high turndown gas burner for rooftop
systems are also fully integrated with MicroTech II controls.
These options provide direct measurement and
±5% of the minimum ventilation air volume and provide
precise and economical tempering of supply air flow.
• For ASHRAE Standard 90.1-1999 Compliance – When
the duct static pressure setpoint is required to be reset at
light loads so that one of the VAV boxes is 100% open,
communication between the BAS and MicroTech II allows
easy compliance. MicroTech II also supports multiple
sensors so that duct static pressure can be measured far
enough downstream to allow a setpoint equal to one-third
of the fan’s total static pressure. Discharge air temperature
reset is a standard control feature and is accomplished
using built-in control algorithms or input from your BAS.
Finally, McQuay applied rooftop units are available with a
factory-installed, fully integrated energy recovery wheel to
meet ASHRAE Standard 90.1 requirements for buildings
with high ventilation rates.
• For Proper Building Static Pressure Control – To help
your BAS maintain control of building static pressure,
MicroTech II unit controllers offer either VaneTrol™ fan
tracking control or direct building pressure measurement
and control.
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Easy Integration Into Your Building Automation System Of Choice.
Communication Module Protocol Options
• BACnet MS/TP
• BACnet/IP
• LonTalk® DAC (FTT-10A)
Designed in accordance with LONMARK® Discharge Air
Controller (DAC) Functional Profiles.
• LonTalk® SCC (FTT-10A)
Designed in accordance with LONMARK® Space Comfort
Controller (SCC) Functional Profiles.
Comprehensive Data Available Regardless of
Your Protocol Choice
The data available from your McQuay Rooftop and SelfContained units with MicroTech II unit controllers provides
clear operating status information and notifies your BAS of
alarm conditions regardless of the protocol you select.
Typical Data Points (R=Read, W=Write)*
Cooling Capacity (R)
Heating Capacity (R)
Application Mode (R/W)
Occupancy (R)
Occupancy Mode (R/W)
Emergency Override Mode Flag (R/W)
Discharge Air Temperature (R)
Return Air Temperature (R)
Space Temperature (R)
Outdoor Air Temperature (R)
Discharge Fan Status (R)
Return Fan Status (2), (R)
Duct Static Pressure (R)
Duct Static Pressure Setpoint (R/W)
Discharge Fan Capacity (R)
Building Static Pressure (R)
Building Static Pressure Setpoint (2), (R/W)
Return Fan Capacity (2), (R)
Effective Cooling Enable Setpoint (R)
Occupied Cooling Setpoint (R/W)
Unoccupied Cooling Setpoint (R/W)
Effective Heating Enable Setpoint (R)
Occupied Heating Enable Setpoint (R/W)
Unoccupied Heating Enable Setpoint (R/W)
Effective Cooling Discharge Setpoint (R)
Discharge Air Cooling Setpoint (R/W)
Outdoor Air Damper Position (R)
Effective Min. Outdoor Damper Pos. Spt. (R)
Outdoor Airflow (2), (R)
Outdoor Air Damper Min. Position (R/W)
Min. Outdoor Airflow/Damper Pos. (R/W)
Effective Heating Discharge Setpoint (R)
Discharge Air Heating Setpoint (R/W)
Dehumidification Status (R)
Relative Humidity (R)
Dew Point Temperature (R)
Relative Humidity Setpoint (R/W)
Occupancy Scheduler Input (R/W)
Typical 2”x4” Communication Module – Each
communication module may ship factory installed or be
easily plugged into the MicroTech II main circuit board
once a protocol selection has been made.
Typical Alarms*
Freeze Alarm
Smoke Alarm
Discharge Air Temp Sensor Failure
Entering Water Temp Sensor Failure (1)
Mixed Air Temp Sensor Failure (1)
Outdoor Air Temp Sensor Failure
Return Air Temp Sensor Failure
Space Temp Sensor Failure
Duct Pressure High Limit
High Return Air Temp
High Discharge Air Temp
Low Discharge Air Temp
Fan Failure
Heat Failure
Economizer/Outdoor Air Damper Stuck
Airflow Switch Alarm
Dirty Filter Alarm
Low Airflow Alarm
No Water Flow Alarm (1)
Water Regulating Valve Alarm (1)
Circuit High Pressure Alarm (per circuit)
Circuit Low Pressure/Frost Alarm (per circuit)
Compressor Motor Protection Alarm (per comp.)
Ckt. 1/Comp. Brd. 1 Clg. Enable
Ckt. 2/Comp. Brd. 2 Clg. Enable
Ckt. 1/Comp. Brd. 1 Comm. Failure
Ckt. 2/Comp. Brd. 2 Comm. Failure
(1) Self-Contained units only
(2) Rooftop units only
* Not all data points or alarms listed are available in all unit
configurations depending upon unit options.
McQuay International reserves the right to change design and
specifications without notice in support of our policy of continuous
product and product data improvement.
™® The following are trademarks or registered trademarks of their
respective companies: BACnet from ASHRAE, LONMARK, LonTalk and
LONWORKS from Echelon Corporation, Protocol Selectability,
MicroTech II, DesignFlow, and SuperMod from McQuay International.
©2002 McQuay International, 13600 Industrial Park Boulevard, Minneapolis, MN 55440 USA (800) 432-1342
A/SP 31-170
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