Page 4 IM 781-2
Figure 30. Typical Hardwired Chiller Field Wiring Diagram..............................................................46
Figure 31. Direct % RLA Signal from Chiller .....................................................................................47
Figure 32. Measuring Compressor Amps with a Current Output Current Transducer.........................48
Figure 33. Hardwired Chiller’s Possible Hardware Requirements .....................................................53
Tables
Table 1. 120 VAC models building power termination ......................................................................19
Table 2. International Models - 240 VAC models building power termination..................................20
Table 3. Examples of Possible Ethernet Hardware.............................................................................20
Table 4. Analog/Digital Inputs and Outputs .......................................................................................24
Table 5. External Modem Hardware...................................................................................................39
Table 6. External Modem Modular Adapter Assembly Pin Assignments...........................................40
Table 7. Modem Configuration Parameters (ras.properties)...............................................................41
Table 8. Signal Averaging Device Specification ................................................................................48
Table 9. Current Transducer Specification ..........................................................................................49
Table 10. Temperature Sensor Specification .......................................................................................49
Table 11. Voltage to Current Converter (0-10 VDC to 4-20 mA) Specification .................................51
Table 12. Hardwired Chiller’s Hardware Transformer Usage ............................................................52
Table 13. Standard Replacement Parts ...............................................................................................55
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. Windows and Internet Explorer from
Microsoft Corporation; BACnet from ASHRAE; L
ONWORKS and LonTalk from Echelon Corporation; Niagara Framework
from Tridium, Inc; Modbus from Gould, Inc.; HyperTerminal from Hilgraeve Inc.; McQuay and MicroTech II from
McQuay International.
Reference Documents
Company Number Title Source
McQuay International OM-780 MicroTech II Chiller System Manager Operation Manual
www.mcquay.com
McQuay International IM783 MicroTech II Remote I/O Panel Installation Manual
www.mcquay.com
McQuay International IM735
MicroTech II Chiller Unit Controller
LONWORKS® Communication
Module
www.mcquay.com
McQuay International CD 112024501 MicroTech II Chiller System Manager Certified Drawing
www.mcquay.com
McQuay International CD 112028701 MicroTech II Remote I/O Panel Certified Drawing
www.mcquay.com
McQuay International CD 251740501 MicroTech II Chiller System Manager Remote I/O Module Certified
Drawing
www.mcquay.com
Tridium, Inc - Net Connect Guide
www.mcquay.com
Tridium, Inc - Using the Admin Tool
www.mcquay.com
Echelon 078-0156-01G
LONWORKS FTT-10A Transceiver User’s Guide www.echelon.com/support/documentatio
n/Manuals/078-0156-01G.pdf
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