McQuay IM781 Installation Manual
Installation Manual
IM 783-2
MicroTech II®
Remote I/O Panel Installation Manual
Group: Controls
Part Number: IM 783
Date: November 2006
Supersedes: IM 783-1
Table of Contents
Notice....................................................................................................................................................3
Reference Documents ...........................................................................................................................3
Revision History....................................................................................................................................3
Introduction ...........................................................................................................................4
Panel Location and Mounting..............................................................................................5
Unpack the Remote I/O Panel...............................................................................................................5
Physical Installation ..............................................................................................................................5
Tools Required..................................................................................................................................5
Before Installation.............................................................................................................................5
Mounting...........................................................................................................................................5
Opening and Closing the Cover............................................................................................................8
Opening the Cover of a Remote I/O Panel........................................................................................ 8
Closing the Cover of a Remote I/O Panel.........................................................................................8
Field Wiring............................................................................................................................9
Power Wiring........................................................................................................................................9
About the Transformer..........................................................................................................................9
Connecting Power to the Transformer..................................................................................................9
Remote I/O Modules............................................................................................................12
Mounting Remote I/O Modules .......................................................................................................... 12
General Control Wiring of Remote I/O Modules................................................................................12
Designation of Remote I/O Modules...................................................................................................13
Maintenance.........................................................................................................................14
Cleaning .............................................................................................................................................. 14
Parts List..............................................................................................................................................14
Warranty...............................................................................................................................15
Warranty Return Material Procedure.................................................................................................. 15
Replacement Parts...............................................................................................................................15
Page 2 IM 783-2
Notice
McQuay International reserves the right to change any information contained herein without prior notice. The user is
responsible for determining whether this product is appropriate for his or her application.
The following are trademarks or registered trademarks of their respective companies. L
ONWORKS from Echelon
Corporation; McQuay and MicroTech II from McQuay International.
Reference Documents
Company Number Title Available At:
McQuay
International
McQuay
International
OM 780 MicroTech II Chiller System Manager Operation Manual
IM 781 MicroTech II Chiller System Manager Installation Manual
www.mcquay.com
www.mcquay.com
All McQuay documents are available at www.mcquay.com
.
Revision History
IM 783-0 February 28, 2004 First release.
IM 783-1 July 7, 2004 Revised Standard Replacement Parts List.
IM 783-1 August 26, 2004 Added hardwired to Designation of Remote I/O
IM 783-2 November 28, 2006 Changed entire panel enclosure and wiring
modules section.
schematic per new supplier.
IM 783-2 Page 3
Introduction
The MicroTech II® Remote I/O panel consists of a sheet metal enclosure housing a transformer, and remote I/O modules.
These modules provide additional input/output for use with a Chiller System Manager (CSM) supervisory controller. These
modules communicate with the supervisory controller via a two wire L
be mounted at strategic locations around the building, near the controlled devices to avoid long runs of control wires back to
the supervisory controller.
A CSM can control pumps, fans, valves, boilers, etc. The supervisory controllers use remote I/O modules as an expandable
platform of inputs and outputs to control different size pump stations, cooling towers, etc. For example, a large chiller plant
may have more secondary pumps to control than a smaller plant and fewer remote I/O modules are required to control the
smaller plant.
Remote I/O modules are not application specific. All the application software resides in the CSM supervisory controller.
This means that the same remote I/O modules are used on a CSM. Remote I/O modules may be purchased and mounted in
the field. They can also be purchased pre-mounted in a remote I/O panel ready for wall mounting.
A remote I/O panel may have from one to four remote I/O modules. The number of modules per panel is determined by job
requirements. See the installation manual of the supervisory controller to determine specific uses for the modules. Each
module provides the following input/outputs:
• 4 Universal Inputs
• 4 Digital Inputs
• 4 Relay Outputs (normally-open contacts rated for 6 Amps @ 230 Volts)
• 2 Analog Outputs (0-10 Volts DC)
Remote I/O panels come with either 120 volt or a 240 volt power supplies. See the part number designation table below:
ONWORKS® communications network. The panel can
Table 1. Remote I/O Panel Part Numbers
Number of Modules per Panel 120 Volt 240 Volt
1 112028701 112029401
2 112029101 112029501
3 112029201 112029601
4 112029301 112029701
WARNING
!
Electric shock hazard.
Can cause personal injury or equipment damage.
This equipment must be properly grounded to the MicroTech II control panel. Connections and service must
be performed by trained personnel with experience with the equipment being controlled.
!
CAUTION
Static sensitive components.
Can cause equipment damage.
Discharge any static electrical charge by touching the bare metal inside the control panel before performing
any service work. Never unplug cables, circuit board terminal blocks, or power plugs while power is applied to
the panel.
Page 4 IM 783-2
Panel Location and Mounting
Unpack the Remote I/O Panel
Unpack the remote I/O panel and inspect the contents of the package for damaged or missing components. If damaged, notify
the appropriate carrier at once and contact your local McQuay representative for immediate repair or replacement.
Physical Installation
Tools Required
The following tools and supplies may be required for installation:
• Small flat-blade screwdriver: used for terminal connections
• Phillips screwdriver: used to secure the door
Before Installation
To reduce the risk of condensation resulting from shipping at low temperatures, keep the remote I/O panel at room
temperature for at least 24 hours before applying power.
Avoid mounting this panel in areas where high electromagnetic interference (EMI) can affect its operation.
Mounting
• Mount the remote I/O panel in a location that allows clearance for wiring, servicing, and module removal. For mounting
details and drill hole locations, refer to the Mounting Guide and Mounting Details, Figure 1 and Figure 2.
• Mount the remote I/O panel within the maximum node-to-node distance to another node of your L
See IM 781 for detail on L
this means the panel must be mounted within 820 ft (250 m) of the nearest L
CSM, a chiller, another remote I/O module, etc). This typical node-to-node distance can be increased to a maximum of
8855-ft (2700 m) by using thicker cable (up to 16 AWG) and doubly terminated networks.
• This product is intended for indoor use only. Do not expose this unit to ambient conditions outside of the range of 0° to
50° C (32° to 122° F) and relative humidity outside the range 5% to 90%, non-condensing (pollution degree 1).
• If the controller is mounted inside an enclosure, that enclosure must be designed to keep the unit within its required
operating range, considering 40-watts heat dissipation. This is especially important if the panel is mounted inside an
enclosure with other heat dissipating equipment.
• For proper mounting clearances see Figure 2. Minimum clearance from the wall on which the unit is mounted is 0.2
inches (provided by the dimpled mounting feet). Provide ample space so that airflow is not blocked behind the unit.
• DO NOT mount the unit:
• In an area where excessive moisture, corrosive fumes, or explosive vapors may be present.
• Where vibration or shock is likely to occur.
• In a location subject to electrical noise. This includes large electrical contactors, electrical machinery, variable
frequency drives, welding equipment, spark igniters, and other equipment of this nature.
• The unit is designed to be wall mounted with the transformer situated towards the top of the unit. For the maximum
airflow, do not mount the unit oriented in any other way.
ONWORKS
®
network wiring and maximum node-to-node distance charts. On a typical network
ONWORKS device (other devices can be the
ONWORKS network.
IM 783-2 Page 5
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